Line data Source code
1 : /**********************************************************************
2 : * pltcl.c - PostgreSQL support for Tcl as
3 : * procedural language (PL)
4 : *
5 : * src/pl/tcl/pltcl.c
6 : *
7 : **********************************************************************/
8 :
9 : #include "postgres.h"
10 :
11 : #include <tcl.h>
12 :
13 : #include <unistd.h>
14 : #include <fcntl.h>
15 :
16 : #include "access/htup_details.h"
17 : #include "access/xact.h"
18 : #include "catalog/objectaccess.h"
19 : #include "catalog/pg_proc.h"
20 : #include "catalog/pg_type.h"
21 : #include "commands/event_trigger.h"
22 : #include "commands/trigger.h"
23 : #include "executor/spi.h"
24 : #include "fmgr.h"
25 : #include "funcapi.h"
26 : #include "mb/pg_wchar.h"
27 : #include "miscadmin.h"
28 : #include "nodes/makefuncs.h"
29 : #include "parser/parse_func.h"
30 : #include "parser/parse_type.h"
31 : #include "pgstat.h"
32 : #include "tcop/tcopprot.h"
33 : #include "utils/acl.h"
34 : #include "utils/builtins.h"
35 : #include "utils/lsyscache.h"
36 : #include "utils/memutils.h"
37 : #include "utils/regproc.h"
38 : #include "utils/rel.h"
39 : #include "utils/syscache.h"
40 : #include "utils/typcache.h"
41 :
42 :
43 18 : PG_MODULE_MAGIC;
44 :
45 : #define HAVE_TCL_VERSION(maj,min) \
46 : ((TCL_MAJOR_VERSION > maj) || \
47 : (TCL_MAJOR_VERSION == maj && TCL_MINOR_VERSION >= min))
48 :
49 : /* Insist on Tcl >= 8.4 */
50 : #if !HAVE_TCL_VERSION(8,4)
51 : #error PostgreSQL only supports Tcl 8.4 or later.
52 : #endif
53 :
54 : /* Hack to deal with Tcl 8.6 const-ification without losing compatibility */
55 : #ifndef CONST86
56 : #define CONST86
57 : #endif
58 :
59 : /* define our text domain for translations */
60 : #undef TEXTDOMAIN
61 : #define TEXTDOMAIN PG_TEXTDOMAIN("pltcl")
62 :
63 :
64 : /*
65 : * Support for converting between UTF8 (which is what all strings going into
66 : * or out of Tcl should be) and the database encoding.
67 : *
68 : * If you just use utf_u2e() or utf_e2u() directly, they will leak some
69 : * palloc'd space when doing a conversion. This is not worth worrying about
70 : * if it only happens, say, once per PL/Tcl function call. If it does seem
71 : * worth worrying about, use the wrapper macros.
72 : */
73 :
74 : static inline char *
75 1506 : utf_u2e(const char *src)
76 : {
77 1506 : return pg_any_to_server(src, strlen(src), PG_UTF8);
78 : }
79 :
80 : static inline char *
81 2674 : utf_e2u(const char *src)
82 : {
83 2674 : return pg_server_to_any(src, strlen(src), PG_UTF8);
84 : }
85 :
86 : #define UTF_BEGIN \
87 : do { \
88 : const char *_pltcl_utf_src = NULL; \
89 : char *_pltcl_utf_dst = NULL
90 :
91 : #define UTF_END \
92 : if (_pltcl_utf_src != (const char *) _pltcl_utf_dst) \
93 : pfree(_pltcl_utf_dst); \
94 : } while (0)
95 :
96 : #define UTF_U2E(x) \
97 : (_pltcl_utf_dst = utf_u2e(_pltcl_utf_src = (x)))
98 :
99 : #define UTF_E2U(x) \
100 : (_pltcl_utf_dst = utf_e2u(_pltcl_utf_src = (x)))
101 :
102 :
103 : /**********************************************************************
104 : * Information associated with a Tcl interpreter. We have one interpreter
105 : * that is used for all pltclu (untrusted) functions. For pltcl (trusted)
106 : * functions, there is a separate interpreter for each effective SQL userid.
107 : * (This is needed to ensure that an unprivileged user can't inject Tcl code
108 : * that'll be executed with the privileges of some other SQL user.)
109 : *
110 : * The pltcl_interp_desc structs are kept in a Postgres hash table indexed
111 : * by userid OID, with OID 0 used for the single untrusted interpreter.
112 : **********************************************************************/
113 : typedef struct pltcl_interp_desc
114 : {
115 : Oid user_id; /* Hash key (must be first!) */
116 : Tcl_Interp *interp; /* The interpreter */
117 : Tcl_HashTable query_hash; /* pltcl_query_desc structs */
118 : } pltcl_interp_desc;
119 :
120 :
121 : /**********************************************************************
122 : * The information we cache about loaded procedures
123 : *
124 : * The pltcl_proc_desc struct itself, as well as all subsidiary data,
125 : * is stored in the memory context identified by the fn_cxt field.
126 : * We can reclaim all the data by deleting that context, and should do so
127 : * when the fn_refcount goes to zero. (But note that we do not bother
128 : * trying to clean up Tcl's copy of the procedure definition: it's Tcl's
129 : * problem to manage its memory when we replace a proc definition. We do
130 : * not clean up pltcl_proc_descs when a pg_proc row is deleted, only when
131 : * it is updated, and the same policy applies to Tcl's copy as well.)
132 : *
133 : * Note that the data in this struct is shared across all active calls;
134 : * nothing except the fn_refcount should be changed by a call instance.
135 : **********************************************************************/
136 : typedef struct pltcl_proc_desc
137 : {
138 : char *user_proname; /* user's name (from pg_proc.proname) */
139 : char *internal_proname; /* Tcl name (based on function OID) */
140 : MemoryContext fn_cxt; /* memory context for this procedure */
141 : unsigned long fn_refcount; /* number of active references */
142 : TransactionId fn_xmin; /* xmin of pg_proc row */
143 : ItemPointerData fn_tid; /* TID of pg_proc row */
144 : bool fn_readonly; /* is function readonly? */
145 : bool lanpltrusted; /* is it pltcl (vs. pltclu)? */
146 : pltcl_interp_desc *interp_desc; /* interpreter to use */
147 : Oid result_typid; /* OID of fn's result type */
148 : FmgrInfo result_in_func; /* input function for fn's result type */
149 : Oid result_typioparam; /* param to pass to same */
150 : bool fn_retisset; /* true if function returns a set */
151 : bool fn_retistuple; /* true if function returns composite */
152 : bool fn_retisdomain; /* true if function returns domain */
153 : void *domain_info; /* opaque cache for domain checks */
154 : int nargs; /* number of arguments */
155 : /* these arrays have nargs entries: */
156 : FmgrInfo *arg_out_func; /* output fns for arg types */
157 : bool *arg_is_rowtype; /* is each arg composite? */
158 : } pltcl_proc_desc;
159 :
160 :
161 : /**********************************************************************
162 : * The information we cache about prepared and saved plans
163 : **********************************************************************/
164 : typedef struct pltcl_query_desc
165 : {
166 : char qname[20];
167 : SPIPlanPtr plan;
168 : int nargs;
169 : Oid *argtypes;
170 : FmgrInfo *arginfuncs;
171 : Oid *argtypioparams;
172 : } pltcl_query_desc;
173 :
174 :
175 : /**********************************************************************
176 : * For speedy lookup, we maintain a hash table mapping from
177 : * function OID + trigger flag + user OID to pltcl_proc_desc pointers.
178 : * The reason the pltcl_proc_desc struct isn't directly part of the hash
179 : * entry is to simplify recovery from errors during compile_pltcl_function.
180 : *
181 : * Note: if the same function is called by multiple userIDs within a session,
182 : * there will be a separate pltcl_proc_desc entry for each userID in the case
183 : * of pltcl functions, but only one entry for pltclu functions, because we
184 : * set user_id = 0 for that case.
185 : **********************************************************************/
186 : typedef struct pltcl_proc_key
187 : {
188 : Oid proc_id; /* Function OID */
189 :
190 : /*
191 : * is_trigger is really a bool, but declare as Oid to ensure this struct
192 : * contains no padding
193 : */
194 : Oid is_trigger; /* is it a trigger function? */
195 : Oid user_id; /* User calling the function, or 0 */
196 : } pltcl_proc_key;
197 :
198 : typedef struct pltcl_proc_ptr
199 : {
200 : pltcl_proc_key proc_key; /* Hash key (must be first!) */
201 : pltcl_proc_desc *proc_ptr;
202 : } pltcl_proc_ptr;
203 :
204 :
205 : /**********************************************************************
206 : * Per-call state
207 : **********************************************************************/
208 : typedef struct pltcl_call_state
209 : {
210 : /* Call info struct, or NULL in a trigger */
211 : FunctionCallInfo fcinfo;
212 :
213 : /* Trigger data, if we're in a normal (not event) trigger; else NULL */
214 : TriggerData *trigdata;
215 :
216 : /* Function we're executing (NULL if not yet identified) */
217 : pltcl_proc_desc *prodesc;
218 :
219 : /*
220 : * Information for SRFs and functions returning composite types.
221 : * ret_tupdesc and attinmeta are set up if either fn_retistuple or
222 : * fn_retisset, since even a scalar-returning SRF needs a tuplestore.
223 : */
224 : TupleDesc ret_tupdesc; /* return rowtype, if retistuple or retisset */
225 : AttInMetadata *attinmeta; /* metadata for building tuples of that type */
226 :
227 : ReturnSetInfo *rsi; /* passed-in ReturnSetInfo, if any */
228 : Tuplestorestate *tuple_store; /* SRFs accumulate result here */
229 : MemoryContext tuple_store_cxt; /* context and resowner for tuplestore */
230 : ResourceOwner tuple_store_owner;
231 : } pltcl_call_state;
232 :
233 :
234 : /**********************************************************************
235 : * Global data
236 : **********************************************************************/
237 : static char *pltcl_start_proc = NULL;
238 : static char *pltclu_start_proc = NULL;
239 : static bool pltcl_pm_init_done = false;
240 : static Tcl_Interp *pltcl_hold_interp = NULL;
241 : static HTAB *pltcl_interp_htab = NULL;
242 : static HTAB *pltcl_proc_htab = NULL;
243 :
244 : /* this is saved and restored by pltcl_handler */
245 : static pltcl_call_state *pltcl_current_call_state = NULL;
246 :
247 : /**********************************************************************
248 : * Lookup table for SQLSTATE condition names
249 : **********************************************************************/
250 : typedef struct
251 : {
252 : const char *label;
253 : int sqlerrstate;
254 : } TclExceptionNameMap;
255 :
256 : static const TclExceptionNameMap exception_name_map[] = {
257 : #include "pltclerrcodes.h" /* pgrminclude ignore */
258 : {NULL, 0}
259 : };
260 :
261 : /**********************************************************************
262 : * Forward declarations
263 : **********************************************************************/
264 :
265 : static void pltcl_init_interp(pltcl_interp_desc *interp_desc,
266 : Oid prolang, bool pltrusted);
267 : static pltcl_interp_desc *pltcl_fetch_interp(Oid prolang, bool pltrusted);
268 : static void call_pltcl_start_proc(Oid prolang, bool pltrusted);
269 : static void start_proc_error_callback(void *arg);
270 :
271 : static Datum pltcl_handler(PG_FUNCTION_ARGS, bool pltrusted);
272 :
273 : static Datum pltcl_func_handler(PG_FUNCTION_ARGS, pltcl_call_state *call_state,
274 : bool pltrusted);
275 : static HeapTuple pltcl_trigger_handler(PG_FUNCTION_ARGS, pltcl_call_state *call_state,
276 : bool pltrusted);
277 : static void pltcl_event_trigger_handler(PG_FUNCTION_ARGS, pltcl_call_state *call_state,
278 : bool pltrusted);
279 :
280 : static void throw_tcl_error(Tcl_Interp *interp, const char *proname);
281 :
282 : static pltcl_proc_desc *compile_pltcl_function(Oid fn_oid, Oid tgreloid,
283 : bool is_event_trigger,
284 : bool pltrusted);
285 :
286 : static int pltcl_elog(ClientData cdata, Tcl_Interp *interp,
287 : int objc, Tcl_Obj *const objv[]);
288 : static void pltcl_construct_errorCode(Tcl_Interp *interp, ErrorData *edata);
289 : static const char *pltcl_get_condition_name(int sqlstate);
290 : static int pltcl_quote(ClientData cdata, Tcl_Interp *interp,
291 : int objc, Tcl_Obj *const objv[]);
292 : static int pltcl_argisnull(ClientData cdata, Tcl_Interp *interp,
293 : int objc, Tcl_Obj *const objv[]);
294 : static int pltcl_returnnull(ClientData cdata, Tcl_Interp *interp,
295 : int objc, Tcl_Obj *const objv[]);
296 : static int pltcl_returnnext(ClientData cdata, Tcl_Interp *interp,
297 : int objc, Tcl_Obj *const objv[]);
298 : static int pltcl_SPI_execute(ClientData cdata, Tcl_Interp *interp,
299 : int objc, Tcl_Obj *const objv[]);
300 : static int pltcl_process_SPI_result(Tcl_Interp *interp,
301 : const char *arrayname,
302 : Tcl_Obj *loop_body,
303 : int spi_rc,
304 : SPITupleTable *tuptable,
305 : uint64 ntuples);
306 : static int pltcl_SPI_prepare(ClientData cdata, Tcl_Interp *interp,
307 : int objc, Tcl_Obj *const objv[]);
308 : static int pltcl_SPI_execute_plan(ClientData cdata, Tcl_Interp *interp,
309 : int objc, Tcl_Obj *const objv[]);
310 : static int pltcl_subtransaction(ClientData cdata, Tcl_Interp *interp,
311 : int objc, Tcl_Obj *const objv[]);
312 : static int pltcl_commit(ClientData cdata, Tcl_Interp *interp,
313 : int objc, Tcl_Obj *const objv[]);
314 : static int pltcl_rollback(ClientData cdata, Tcl_Interp *interp,
315 : int objc, Tcl_Obj *const objv[]);
316 :
317 : static void pltcl_subtrans_begin(MemoryContext oldcontext,
318 : ResourceOwner oldowner);
319 : static void pltcl_subtrans_commit(MemoryContext oldcontext,
320 : ResourceOwner oldowner);
321 : static void pltcl_subtrans_abort(Tcl_Interp *interp,
322 : MemoryContext oldcontext,
323 : ResourceOwner oldowner);
324 :
325 : static void pltcl_set_tuple_values(Tcl_Interp *interp, const char *arrayname,
326 : uint64 tupno, HeapTuple tuple, TupleDesc tupdesc);
327 : static Tcl_Obj *pltcl_build_tuple_argument(HeapTuple tuple, TupleDesc tupdesc, bool include_generated);
328 : static HeapTuple pltcl_build_tuple_result(Tcl_Interp *interp,
329 : Tcl_Obj **kvObjv, int kvObjc,
330 : pltcl_call_state *call_state);
331 : static void pltcl_init_tuple_store(pltcl_call_state *call_state);
332 :
333 :
334 : /*
335 : * Hack to override Tcl's builtin Notifier subsystem. This prevents the
336 : * backend from becoming multithreaded, which breaks all sorts of things.
337 : * That happens in the default version of Tcl_InitNotifier if the Tcl library
338 : * has been compiled with multithreading support (i.e. when TCL_THREADS is
339 : * defined under Unix, and in all cases under Windows).
340 : * It's okay to disable the notifier because we never enter the Tcl event loop
341 : * from Postgres, so the notifier capabilities are initialized, but never
342 : * used. Only InitNotifier and DeleteFileHandler ever seem to get called
343 : * within Postgres, but we implement all the functions for completeness.
344 : */
345 : static ClientData
346 18 : pltcl_InitNotifier(void)
347 : {
348 : static int fakeThreadKey; /* To give valid address for ClientData */
349 :
350 18 : return (ClientData) &(fakeThreadKey);
351 : }
352 :
353 : static void
354 0 : pltcl_FinalizeNotifier(ClientData clientData)
355 : {
356 0 : }
357 :
358 : static void
359 2 : pltcl_SetTimer(CONST86 Tcl_Time *timePtr)
360 : {
361 2 : }
362 :
363 : static void
364 0 : pltcl_AlertNotifier(ClientData clientData)
365 : {
366 0 : }
367 :
368 : static void
369 0 : pltcl_CreateFileHandler(int fd, int mask,
370 : Tcl_FileProc *proc, ClientData clientData)
371 : {
372 0 : }
373 :
374 : static void
375 88 : pltcl_DeleteFileHandler(int fd)
376 : {
377 88 : }
378 :
379 : static void
380 0 : pltcl_ServiceModeHook(int mode)
381 : {
382 0 : }
383 :
384 : static int
385 505418 : pltcl_WaitForEvent(CONST86 Tcl_Time *timePtr)
386 : {
387 505418 : return 0;
388 : }
389 :
390 :
391 : /*
392 : * _PG_init() - library load-time initialization
393 : *
394 : * DO NOT make this static nor change its name!
395 : *
396 : * The work done here must be safe to do in the postmaster process,
397 : * in case the pltcl library is preloaded in the postmaster.
398 : */
399 : void
400 18 : _PG_init(void)
401 : {
402 : Tcl_NotifierProcs notifier;
403 : HASHCTL hash_ctl;
404 :
405 : /* Be sure we do initialization only once (should be redundant now) */
406 18 : if (pltcl_pm_init_done)
407 0 : return;
408 :
409 18 : pg_bindtextdomain(TEXTDOMAIN);
410 :
411 : #ifdef WIN32
412 : /* Required on win32 to prevent error loading init.tcl */
413 : Tcl_FindExecutable("");
414 : #endif
415 :
416 : /*
417 : * Override the functions in the Notifier subsystem. See comments above.
418 : */
419 18 : notifier.setTimerProc = pltcl_SetTimer;
420 18 : notifier.waitForEventProc = pltcl_WaitForEvent;
421 18 : notifier.createFileHandlerProc = pltcl_CreateFileHandler;
422 18 : notifier.deleteFileHandlerProc = pltcl_DeleteFileHandler;
423 18 : notifier.initNotifierProc = pltcl_InitNotifier;
424 18 : notifier.finalizeNotifierProc = pltcl_FinalizeNotifier;
425 18 : notifier.alertNotifierProc = pltcl_AlertNotifier;
426 18 : notifier.serviceModeHookProc = pltcl_ServiceModeHook;
427 18 : Tcl_SetNotifier(¬ifier);
428 :
429 : /************************************************************
430 : * Create the dummy hold interpreter to prevent close of
431 : * stdout and stderr on DeleteInterp
432 : ************************************************************/
433 18 : if ((pltcl_hold_interp = Tcl_CreateInterp()) == NULL)
434 0 : elog(ERROR, "could not create dummy Tcl interpreter");
435 18 : if (Tcl_Init(pltcl_hold_interp) == TCL_ERROR)
436 0 : elog(ERROR, "could not initialize dummy Tcl interpreter");
437 :
438 : /************************************************************
439 : * Create the hash table for working interpreters
440 : ************************************************************/
441 18 : hash_ctl.keysize = sizeof(Oid);
442 18 : hash_ctl.entrysize = sizeof(pltcl_interp_desc);
443 18 : pltcl_interp_htab = hash_create("PL/Tcl interpreters",
444 : 8,
445 : &hash_ctl,
446 : HASH_ELEM | HASH_BLOBS);
447 :
448 : /************************************************************
449 : * Create the hash table for function lookup
450 : ************************************************************/
451 18 : hash_ctl.keysize = sizeof(pltcl_proc_key);
452 18 : hash_ctl.entrysize = sizeof(pltcl_proc_ptr);
453 18 : pltcl_proc_htab = hash_create("PL/Tcl functions",
454 : 100,
455 : &hash_ctl,
456 : HASH_ELEM | HASH_BLOBS);
457 :
458 : /************************************************************
459 : * Define PL/Tcl's custom GUCs
460 : ************************************************************/
461 18 : DefineCustomStringVariable("pltcl.start_proc",
462 : gettext_noop("PL/Tcl function to call once when pltcl is first used."),
463 : NULL,
464 : &pltcl_start_proc,
465 : NULL,
466 : PGC_SUSET, 0,
467 : NULL, NULL, NULL);
468 18 : DefineCustomStringVariable("pltclu.start_proc",
469 : gettext_noop("PL/TclU function to call once when pltclu is first used."),
470 : NULL,
471 : &pltclu_start_proc,
472 : NULL,
473 : PGC_SUSET, 0,
474 : NULL, NULL, NULL);
475 :
476 18 : MarkGUCPrefixReserved("pltcl");
477 18 : MarkGUCPrefixReserved("pltclu");
478 :
479 18 : pltcl_pm_init_done = true;
480 : }
481 :
482 : /**********************************************************************
483 : * pltcl_init_interp() - initialize a new Tcl interpreter
484 : **********************************************************************/
485 : static void
486 22 : pltcl_init_interp(pltcl_interp_desc *interp_desc, Oid prolang, bool pltrusted)
487 : {
488 : Tcl_Interp *interp;
489 : char interpname[32];
490 :
491 : /************************************************************
492 : * Create the Tcl interpreter subsidiary to pltcl_hold_interp.
493 : * Note: Tcl automatically does Tcl_Init in the untrusted case,
494 : * and it's not wanted in the trusted case.
495 : ************************************************************/
496 22 : snprintf(interpname, sizeof(interpname), "subsidiary_%u", interp_desc->user_id);
497 22 : if ((interp = Tcl_CreateSlave(pltcl_hold_interp, interpname,
498 : pltrusted ? 1 : 0)) == NULL)
499 0 : elog(ERROR, "could not create subsidiary Tcl interpreter");
500 :
501 : /************************************************************
502 : * Initialize the query hash table associated with interpreter
503 : ************************************************************/
504 22 : Tcl_InitHashTable(&interp_desc->query_hash, TCL_STRING_KEYS);
505 :
506 : /************************************************************
507 : * Install the commands for SPI support in the interpreter
508 : ************************************************************/
509 22 : Tcl_CreateObjCommand(interp, "elog",
510 : pltcl_elog, NULL, NULL);
511 22 : Tcl_CreateObjCommand(interp, "quote",
512 : pltcl_quote, NULL, NULL);
513 22 : Tcl_CreateObjCommand(interp, "argisnull",
514 : pltcl_argisnull, NULL, NULL);
515 22 : Tcl_CreateObjCommand(interp, "return_null",
516 : pltcl_returnnull, NULL, NULL);
517 22 : Tcl_CreateObjCommand(interp, "return_next",
518 : pltcl_returnnext, NULL, NULL);
519 22 : Tcl_CreateObjCommand(interp, "spi_exec",
520 : pltcl_SPI_execute, NULL, NULL);
521 22 : Tcl_CreateObjCommand(interp, "spi_prepare",
522 : pltcl_SPI_prepare, NULL, NULL);
523 22 : Tcl_CreateObjCommand(interp, "spi_execp",
524 : pltcl_SPI_execute_plan, NULL, NULL);
525 22 : Tcl_CreateObjCommand(interp, "subtransaction",
526 : pltcl_subtransaction, NULL, NULL);
527 22 : Tcl_CreateObjCommand(interp, "commit",
528 : pltcl_commit, NULL, NULL);
529 22 : Tcl_CreateObjCommand(interp, "rollback",
530 : pltcl_rollback, NULL, NULL);
531 :
532 : /************************************************************
533 : * Call the appropriate start_proc, if there is one.
534 : *
535 : * We must set interp_desc->interp before the call, else the start_proc
536 : * won't find the interpreter it's supposed to use. But, if the
537 : * start_proc fails, we want to abandon use of the interpreter.
538 : ************************************************************/
539 22 : PG_TRY();
540 : {
541 22 : interp_desc->interp = interp;
542 22 : call_pltcl_start_proc(prolang, pltrusted);
543 : }
544 6 : PG_CATCH();
545 : {
546 6 : interp_desc->interp = NULL;
547 6 : Tcl_DeleteInterp(interp);
548 6 : PG_RE_THROW();
549 : }
550 16 : PG_END_TRY();
551 16 : }
552 :
553 : /**********************************************************************
554 : * pltcl_fetch_interp() - fetch the Tcl interpreter to use for a function
555 : *
556 : * This also takes care of any on-first-use initialization required.
557 : **********************************************************************/
558 : static pltcl_interp_desc *
559 120 : pltcl_fetch_interp(Oid prolang, bool pltrusted)
560 : {
561 : Oid user_id;
562 : pltcl_interp_desc *interp_desc;
563 : bool found;
564 :
565 : /* Find or create the interpreter hashtable entry for this userid */
566 120 : if (pltrusted)
567 120 : user_id = GetUserId();
568 : else
569 0 : user_id = InvalidOid;
570 :
571 120 : interp_desc = hash_search(pltcl_interp_htab, &user_id,
572 : HASH_ENTER,
573 : &found);
574 120 : if (!found)
575 16 : interp_desc->interp = NULL;
576 :
577 : /* If we haven't yet successfully made an interpreter, try to do that */
578 120 : if (!interp_desc->interp)
579 22 : pltcl_init_interp(interp_desc, prolang, pltrusted);
580 :
581 114 : return interp_desc;
582 : }
583 :
584 :
585 : /**********************************************************************
586 : * call_pltcl_start_proc() - Call user-defined initialization proc, if any
587 : **********************************************************************/
588 : static void
589 22 : call_pltcl_start_proc(Oid prolang, bool pltrusted)
590 : {
591 22 : LOCAL_FCINFO(fcinfo, 0);
592 : char *start_proc;
593 : const char *gucname;
594 : ErrorContextCallback errcallback;
595 : List *namelist;
596 : Oid procOid;
597 : HeapTuple procTup;
598 : Form_pg_proc procStruct;
599 : AclResult aclresult;
600 : FmgrInfo finfo;
601 : PgStat_FunctionCallUsage fcusage;
602 :
603 : /* select appropriate GUC */
604 22 : start_proc = pltrusted ? pltcl_start_proc : pltclu_start_proc;
605 22 : gucname = pltrusted ? "pltcl.start_proc" : "pltclu.start_proc";
606 :
607 : /* Nothing to do if it's empty or unset */
608 22 : if (start_proc == NULL || start_proc[0] == '\0')
609 14 : return;
610 :
611 : /* Set up errcontext callback to make errors more helpful */
612 8 : errcallback.callback = start_proc_error_callback;
613 8 : errcallback.arg = unconstify(char *, gucname);
614 8 : errcallback.previous = error_context_stack;
615 8 : error_context_stack = &errcallback;
616 :
617 : /* Parse possibly-qualified identifier and look up the function */
618 8 : namelist = stringToQualifiedNameList(start_proc, NULL);
619 8 : procOid = LookupFuncName(namelist, 0, NULL, false);
620 :
621 : /* Current user must have permission to call function */
622 4 : aclresult = object_aclcheck(ProcedureRelationId, procOid, GetUserId(), ACL_EXECUTE);
623 4 : if (aclresult != ACLCHECK_OK)
624 0 : aclcheck_error(aclresult, OBJECT_FUNCTION, start_proc);
625 :
626 : /* Get the function's pg_proc entry */
627 4 : procTup = SearchSysCache1(PROCOID, ObjectIdGetDatum(procOid));
628 4 : if (!HeapTupleIsValid(procTup))
629 0 : elog(ERROR, "cache lookup failed for function %u", procOid);
630 4 : procStruct = (Form_pg_proc) GETSTRUCT(procTup);
631 :
632 : /* It must be same language as the function we're currently calling */
633 4 : if (procStruct->prolang != prolang)
634 0 : ereport(ERROR,
635 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
636 : errmsg("function \"%s\" is in the wrong language",
637 : start_proc)));
638 :
639 : /*
640 : * It must not be SECURITY DEFINER, either. This together with the
641 : * language match check ensures that the function will execute in the same
642 : * Tcl interpreter we just finished initializing.
643 : */
644 4 : if (procStruct->prosecdef)
645 2 : ereport(ERROR,
646 : (errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
647 : errmsg("function \"%s\" must not be SECURITY DEFINER",
648 : start_proc)));
649 :
650 : /* A-OK */
651 2 : ReleaseSysCache(procTup);
652 :
653 : /*
654 : * Call the function using the normal SQL function call mechanism. We
655 : * could perhaps cheat and jump directly to pltcl_handler(), but it seems
656 : * better to do it this way so that the call is exposed to, eg, call
657 : * statistics collection.
658 : */
659 2 : InvokeFunctionExecuteHook(procOid);
660 2 : fmgr_info(procOid, &finfo);
661 2 : InitFunctionCallInfoData(*fcinfo, &finfo,
662 : 0,
663 : InvalidOid, NULL, NULL);
664 2 : pgstat_init_function_usage(fcinfo, &fcusage);
665 2 : (void) FunctionCallInvoke(fcinfo);
666 2 : pgstat_end_function_usage(&fcusage, true);
667 :
668 : /* Pop the error context stack */
669 2 : error_context_stack = errcallback.previous;
670 : }
671 :
672 : /*
673 : * Error context callback for errors occurring during start_proc processing.
674 : */
675 : static void
676 8 : start_proc_error_callback(void *arg)
677 : {
678 8 : const char *gucname = (const char *) arg;
679 :
680 : /* translator: %s is "pltcl.start_proc" or "pltclu.start_proc" */
681 8 : errcontext("processing %s parameter", gucname);
682 8 : }
683 :
684 :
685 : /**********************************************************************
686 : * pltcl_call_handler - This is the only visible function
687 : * of the PL interpreter. The PostgreSQL
688 : * function manager and trigger manager
689 : * call this function for execution of
690 : * PL/Tcl procedures.
691 : **********************************************************************/
692 18 : PG_FUNCTION_INFO_V1(pltcl_call_handler);
693 :
694 : /* keep non-static */
695 : Datum
696 432 : pltcl_call_handler(PG_FUNCTION_ARGS)
697 : {
698 432 : return pltcl_handler(fcinfo, true);
699 : }
700 :
701 : /*
702 : * Alternative handler for unsafe functions
703 : */
704 0 : PG_FUNCTION_INFO_V1(pltclu_call_handler);
705 :
706 : /* keep non-static */
707 : Datum
708 0 : pltclu_call_handler(PG_FUNCTION_ARGS)
709 : {
710 0 : return pltcl_handler(fcinfo, false);
711 : }
712 :
713 :
714 : /**********************************************************************
715 : * pltcl_handler() - Handler for function and trigger calls, for
716 : * both trusted and untrusted interpreters.
717 : **********************************************************************/
718 : static Datum
719 432 : pltcl_handler(PG_FUNCTION_ARGS, bool pltrusted)
720 : {
721 432 : Datum retval = (Datum) 0;
722 : pltcl_call_state current_call_state;
723 : pltcl_call_state *save_call_state;
724 :
725 : /*
726 : * Initialize current_call_state to nulls/zeroes; in particular, set its
727 : * prodesc pointer to null. Anything that sets it non-null should
728 : * increase the prodesc's fn_refcount at the same time. We'll decrease
729 : * the refcount, and then delete the prodesc if it's no longer referenced,
730 : * on the way out of this function. This ensures that prodescs live as
731 : * long as needed even if somebody replaces the originating pg_proc row
732 : * while they're executing.
733 : */
734 432 : memset(¤t_call_state, 0, sizeof(current_call_state));
735 :
736 : /*
737 : * Ensure that static pointer is saved/restored properly
738 : */
739 432 : save_call_state = pltcl_current_call_state;
740 432 : pltcl_current_call_state = ¤t_call_state;
741 :
742 432 : PG_TRY();
743 : {
744 : /*
745 : * Determine if called as function or trigger and call appropriate
746 : * subhandler
747 : */
748 432 : if (CALLED_AS_TRIGGER(fcinfo))
749 : {
750 : /* invoke the trigger handler */
751 116 : retval = PointerGetDatum(pltcl_trigger_handler(fcinfo,
752 : ¤t_call_state,
753 : pltrusted));
754 : }
755 316 : else if (CALLED_AS_EVENT_TRIGGER(fcinfo))
756 : {
757 : /* invoke the event trigger handler */
758 20 : pltcl_event_trigger_handler(fcinfo, ¤t_call_state, pltrusted);
759 20 : retval = (Datum) 0;
760 : }
761 : else
762 : {
763 : /* invoke the regular function handler */
764 296 : current_call_state.fcinfo = fcinfo;
765 296 : retval = pltcl_func_handler(fcinfo, ¤t_call_state, pltrusted);
766 : }
767 : }
768 108 : PG_FINALLY();
769 : {
770 : /* Restore static pointer, then clean up the prodesc refcount if any */
771 : /*
772 : * (We're being paranoid in case an error is thrown in context
773 : * deletion)
774 : */
775 432 : pltcl_current_call_state = save_call_state;
776 432 : if (current_call_state.prodesc != NULL)
777 : {
778 : Assert(current_call_state.prodesc->fn_refcount > 0);
779 426 : if (--current_call_state.prodesc->fn_refcount == 0)
780 0 : MemoryContextDelete(current_call_state.prodesc->fn_cxt);
781 : }
782 : }
783 432 : PG_END_TRY();
784 :
785 324 : return retval;
786 : }
787 :
788 :
789 : /**********************************************************************
790 : * pltcl_func_handler() - Handler for regular function calls
791 : **********************************************************************/
792 : static Datum
793 296 : pltcl_func_handler(PG_FUNCTION_ARGS, pltcl_call_state *call_state,
794 : bool pltrusted)
795 : {
796 : bool nonatomic;
797 : pltcl_proc_desc *prodesc;
798 : Tcl_Interp *volatile interp;
799 : Tcl_Obj *tcl_cmd;
800 : int i;
801 : int tcl_rc;
802 : Datum retval;
803 :
804 662 : nonatomic = fcinfo->context &&
805 320 : IsA(fcinfo->context, CallContext) &&
806 24 : !castNode(CallContext, fcinfo->context)->atomic;
807 :
808 : /* Connect to SPI manager */
809 296 : if (SPI_connect_ext(nonatomic ? SPI_OPT_NONATOMIC : 0) != SPI_OK_CONNECT)
810 0 : elog(ERROR, "could not connect to SPI manager");
811 :
812 : /* Find or compile the function */
813 296 : prodesc = compile_pltcl_function(fcinfo->flinfo->fn_oid, InvalidOid,
814 : false, pltrusted);
815 :
816 290 : call_state->prodesc = prodesc;
817 290 : prodesc->fn_refcount++;
818 :
819 290 : interp = prodesc->interp_desc->interp;
820 :
821 : /*
822 : * If we're a SRF, check caller can handle materialize mode, and save
823 : * relevant info into call_state. We must ensure that the returned
824 : * tuplestore is owned by the caller's context, even if we first create it
825 : * inside a subtransaction.
826 : */
827 290 : if (prodesc->fn_retisset)
828 : {
829 10 : ReturnSetInfo *rsi = (ReturnSetInfo *) fcinfo->resultinfo;
830 :
831 10 : if (!rsi || !IsA(rsi, ReturnSetInfo))
832 0 : ereport(ERROR,
833 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
834 : errmsg("set-valued function called in context that cannot accept a set")));
835 :
836 10 : if (!(rsi->allowedModes & SFRM_Materialize))
837 0 : ereport(ERROR,
838 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
839 : errmsg("materialize mode required, but it is not allowed in this context")));
840 :
841 10 : call_state->rsi = rsi;
842 10 : call_state->tuple_store_cxt = rsi->econtext->ecxt_per_query_memory;
843 10 : call_state->tuple_store_owner = CurrentResourceOwner;
844 : }
845 :
846 : /************************************************************
847 : * Create the tcl command to call the internal
848 : * proc in the Tcl interpreter
849 : ************************************************************/
850 290 : tcl_cmd = Tcl_NewObj();
851 290 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
852 290 : Tcl_NewStringObj(prodesc->internal_proname, -1));
853 :
854 : /* We hold a refcount on tcl_cmd just to be sure it stays around */
855 290 : Tcl_IncrRefCount(tcl_cmd);
856 :
857 : /************************************************************
858 : * Add all call arguments to the command
859 : ************************************************************/
860 290 : PG_TRY();
861 : {
862 672 : for (i = 0; i < prodesc->nargs; i++)
863 : {
864 382 : if (prodesc->arg_is_rowtype[i])
865 : {
866 : /**************************************************
867 : * For tuple values, add a list for 'array set ...'
868 : **************************************************/
869 14 : if (fcinfo->args[i].isnull)
870 0 : Tcl_ListObjAppendElement(NULL, tcl_cmd, Tcl_NewObj());
871 : else
872 : {
873 : HeapTupleHeader td;
874 : Oid tupType;
875 : int32 tupTypmod;
876 : TupleDesc tupdesc;
877 : HeapTupleData tmptup;
878 : Tcl_Obj *list_tmp;
879 :
880 14 : td = DatumGetHeapTupleHeader(fcinfo->args[i].value);
881 : /* Extract rowtype info and find a tupdesc */
882 14 : tupType = HeapTupleHeaderGetTypeId(td);
883 14 : tupTypmod = HeapTupleHeaderGetTypMod(td);
884 14 : tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
885 : /* Build a temporary HeapTuple control structure */
886 14 : tmptup.t_len = HeapTupleHeaderGetDatumLength(td);
887 14 : tmptup.t_data = td;
888 :
889 14 : list_tmp = pltcl_build_tuple_argument(&tmptup, tupdesc, true);
890 14 : Tcl_ListObjAppendElement(NULL, tcl_cmd, list_tmp);
891 :
892 14 : ReleaseTupleDesc(tupdesc);
893 : }
894 : }
895 : else
896 : {
897 : /**************************************************
898 : * Single values are added as string element
899 : * of their external representation
900 : **************************************************/
901 368 : if (fcinfo->args[i].isnull)
902 4 : Tcl_ListObjAppendElement(NULL, tcl_cmd, Tcl_NewObj());
903 : else
904 : {
905 : char *tmp;
906 :
907 364 : tmp = OutputFunctionCall(&prodesc->arg_out_func[i],
908 : fcinfo->args[i].value);
909 364 : UTF_BEGIN;
910 364 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
911 364 : Tcl_NewStringObj(UTF_E2U(tmp), -1));
912 364 : UTF_END;
913 364 : pfree(tmp);
914 : }
915 : }
916 : }
917 : }
918 0 : PG_CATCH();
919 : {
920 : /* Release refcount to free tcl_cmd */
921 0 : Tcl_DecrRefCount(tcl_cmd);
922 0 : PG_RE_THROW();
923 : }
924 290 : PG_END_TRY();
925 :
926 : /************************************************************
927 : * Call the Tcl function
928 : *
929 : * We assume no PG error can be thrown directly from this call.
930 : ************************************************************/
931 290 : tcl_rc = Tcl_EvalObjEx(interp, tcl_cmd, (TCL_EVAL_DIRECT | TCL_EVAL_GLOBAL));
932 :
933 : /* Release refcount to free tcl_cmd (and all subsidiary objects) */
934 290 : Tcl_DecrRefCount(tcl_cmd);
935 :
936 : /************************************************************
937 : * Check for errors reported by Tcl.
938 : ************************************************************/
939 290 : if (tcl_rc != TCL_OK)
940 76 : throw_tcl_error(interp, prodesc->user_proname);
941 :
942 : /************************************************************
943 : * Disconnect from SPI manager and then create the return
944 : * value datum (if the input function does a palloc for it
945 : * this must not be allocated in the SPI memory context
946 : * because SPI_finish would free it). But don't try to call
947 : * the result_in_func if we've been told to return a NULL;
948 : * the Tcl result may not be a valid value of the result type
949 : * in that case.
950 : ************************************************************/
951 214 : if (SPI_finish() != SPI_OK_FINISH)
952 0 : elog(ERROR, "SPI_finish() failed");
953 :
954 214 : if (prodesc->fn_retisset)
955 : {
956 6 : ReturnSetInfo *rsi = call_state->rsi;
957 :
958 : /* We already checked this is OK */
959 6 : rsi->returnMode = SFRM_Materialize;
960 :
961 : /* If we produced any tuples, send back the result */
962 6 : if (call_state->tuple_store)
963 : {
964 6 : rsi->setResult = call_state->tuple_store;
965 6 : if (call_state->ret_tupdesc)
966 : {
967 : MemoryContext oldcxt;
968 :
969 6 : oldcxt = MemoryContextSwitchTo(call_state->tuple_store_cxt);
970 6 : rsi->setDesc = CreateTupleDescCopy(call_state->ret_tupdesc);
971 6 : MemoryContextSwitchTo(oldcxt);
972 : }
973 : }
974 6 : retval = (Datum) 0;
975 6 : fcinfo->isnull = true;
976 : }
977 208 : else if (fcinfo->isnull)
978 : {
979 2 : retval = InputFunctionCall(&prodesc->result_in_func,
980 : NULL,
981 : prodesc->result_typioparam,
982 : -1);
983 : }
984 206 : else if (prodesc->fn_retistuple)
985 : {
986 : TupleDesc td;
987 : HeapTuple tup;
988 : Tcl_Obj *resultObj;
989 : Tcl_Obj **resultObjv;
990 : int resultObjc;
991 :
992 : /*
993 : * Set up data about result type. XXX it's tempting to consider
994 : * caching this in the prodesc, in the common case where the rowtype
995 : * is determined by the function not the calling query. But we'd have
996 : * to be able to deal with ADD/DROP/ALTER COLUMN events when the
997 : * result type is a named composite type, so it's not exactly trivial.
998 : * Maybe worth improving someday.
999 : */
1000 30 : switch (get_call_result_type(fcinfo, NULL, &td))
1001 : {
1002 22 : case TYPEFUNC_COMPOSITE:
1003 : /* success */
1004 22 : break;
1005 6 : case TYPEFUNC_COMPOSITE_DOMAIN:
1006 : Assert(prodesc->fn_retisdomain);
1007 6 : break;
1008 2 : case TYPEFUNC_RECORD:
1009 : /* failed to determine actual type of RECORD */
1010 2 : ereport(ERROR,
1011 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1012 : errmsg("function returning record called in context "
1013 : "that cannot accept type record")));
1014 : break;
1015 0 : default:
1016 : /* result type isn't composite? */
1017 0 : elog(ERROR, "return type must be a row type");
1018 : break;
1019 : }
1020 :
1021 : Assert(!call_state->ret_tupdesc);
1022 : Assert(!call_state->attinmeta);
1023 28 : call_state->ret_tupdesc = td;
1024 28 : call_state->attinmeta = TupleDescGetAttInMetadata(td);
1025 :
1026 : /* Convert function result to tuple */
1027 28 : resultObj = Tcl_GetObjResult(interp);
1028 28 : if (Tcl_ListObjGetElements(interp, resultObj, &resultObjc, &resultObjv) == TCL_ERROR)
1029 0 : throw_tcl_error(interp, prodesc->user_proname);
1030 :
1031 28 : tup = pltcl_build_tuple_result(interp, resultObjv, resultObjc,
1032 : call_state);
1033 20 : retval = HeapTupleGetDatum(tup);
1034 : }
1035 : else
1036 176 : retval = InputFunctionCall(&prodesc->result_in_func,
1037 : utf_u2e(Tcl_GetStringResult(interp)),
1038 : prodesc->result_typioparam,
1039 : -1);
1040 :
1041 204 : return retval;
1042 : }
1043 :
1044 :
1045 : /**********************************************************************
1046 : * pltcl_trigger_handler() - Handler for trigger calls
1047 : **********************************************************************/
1048 : static HeapTuple
1049 116 : pltcl_trigger_handler(PG_FUNCTION_ARGS, pltcl_call_state *call_state,
1050 : bool pltrusted)
1051 : {
1052 : pltcl_proc_desc *prodesc;
1053 : Tcl_Interp *volatile interp;
1054 116 : TriggerData *trigdata = (TriggerData *) fcinfo->context;
1055 : char *stroid;
1056 : TupleDesc tupdesc;
1057 : volatile HeapTuple rettup;
1058 : Tcl_Obj *tcl_cmd;
1059 : Tcl_Obj *tcl_trigtup;
1060 : int tcl_rc;
1061 : int i;
1062 : const char *result;
1063 : int result_Objc;
1064 : Tcl_Obj **result_Objv;
1065 : int rc PG_USED_FOR_ASSERTS_ONLY;
1066 :
1067 116 : call_state->trigdata = trigdata;
1068 :
1069 : /* Connect to SPI manager */
1070 116 : if (SPI_connect() != SPI_OK_CONNECT)
1071 0 : elog(ERROR, "could not connect to SPI manager");
1072 :
1073 : /* Make transition tables visible to this SPI connection */
1074 116 : rc = SPI_register_trigger_data(trigdata);
1075 : Assert(rc >= 0);
1076 :
1077 : /* Find or compile the function */
1078 232 : prodesc = compile_pltcl_function(fcinfo->flinfo->fn_oid,
1079 116 : RelationGetRelid(trigdata->tg_relation),
1080 : false, /* not an event trigger */
1081 : pltrusted);
1082 :
1083 116 : call_state->prodesc = prodesc;
1084 116 : prodesc->fn_refcount++;
1085 :
1086 116 : interp = prodesc->interp_desc->interp;
1087 :
1088 116 : tupdesc = RelationGetDescr(trigdata->tg_relation);
1089 :
1090 : /************************************************************
1091 : * Create the tcl command to call the internal
1092 : * proc in the interpreter
1093 : ************************************************************/
1094 116 : tcl_cmd = Tcl_NewObj();
1095 116 : Tcl_IncrRefCount(tcl_cmd);
1096 :
1097 116 : PG_TRY();
1098 : {
1099 : /* The procedure name (note this is all ASCII, so no utf_e2u) */
1100 116 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1101 116 : Tcl_NewStringObj(prodesc->internal_proname, -1));
1102 :
1103 : /* The trigger name for argument TG_name */
1104 116 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1105 116 : Tcl_NewStringObj(utf_e2u(trigdata->tg_trigger->tgname), -1));
1106 :
1107 : /* The oid of the trigger relation for argument TG_relid */
1108 : /* Consider not converting to a string for more performance? */
1109 116 : stroid = DatumGetCString(DirectFunctionCall1(oidout,
1110 : ObjectIdGetDatum(trigdata->tg_relation->rd_id)));
1111 116 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1112 : Tcl_NewStringObj(stroid, -1));
1113 116 : pfree(stroid);
1114 :
1115 : /* The name of the table the trigger is acting on: TG_table_name */
1116 116 : stroid = SPI_getrelname(trigdata->tg_relation);
1117 116 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1118 116 : Tcl_NewStringObj(utf_e2u(stroid), -1));
1119 116 : pfree(stroid);
1120 :
1121 : /* The schema of the table the trigger is acting on: TG_table_schema */
1122 116 : stroid = SPI_getnspname(trigdata->tg_relation);
1123 116 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1124 116 : Tcl_NewStringObj(utf_e2u(stroid), -1));
1125 116 : pfree(stroid);
1126 :
1127 : /* A list of attribute names for argument TG_relatts */
1128 116 : tcl_trigtup = Tcl_NewObj();
1129 116 : Tcl_ListObjAppendElement(NULL, tcl_trigtup, Tcl_NewObj());
1130 516 : for (i = 0; i < tupdesc->natts; i++)
1131 : {
1132 400 : Form_pg_attribute att = TupleDescAttr(tupdesc, i);
1133 :
1134 400 : if (att->attisdropped)
1135 26 : Tcl_ListObjAppendElement(NULL, tcl_trigtup, Tcl_NewObj());
1136 : else
1137 374 : Tcl_ListObjAppendElement(NULL, tcl_trigtup,
1138 374 : Tcl_NewStringObj(utf_e2u(NameStr(att->attname)), -1));
1139 : }
1140 116 : Tcl_ListObjAppendElement(NULL, tcl_cmd, tcl_trigtup);
1141 :
1142 : /* The when part of the event for TG_when */
1143 116 : if (TRIGGER_FIRED_BEFORE(trigdata->tg_event))
1144 94 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1145 : Tcl_NewStringObj("BEFORE", -1));
1146 22 : else if (TRIGGER_FIRED_AFTER(trigdata->tg_event))
1147 16 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1148 : Tcl_NewStringObj("AFTER", -1));
1149 6 : else if (TRIGGER_FIRED_INSTEAD(trigdata->tg_event))
1150 6 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1151 : Tcl_NewStringObj("INSTEAD OF", -1));
1152 : else
1153 0 : elog(ERROR, "unrecognized WHEN tg_event: %u", trigdata->tg_event);
1154 :
1155 : /* The level part of the event for TG_level */
1156 116 : if (TRIGGER_FIRED_FOR_ROW(trigdata->tg_event))
1157 : {
1158 100 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1159 : Tcl_NewStringObj("ROW", -1));
1160 :
1161 : /*
1162 : * Now the command part of the event for TG_op and data for NEW
1163 : * and OLD
1164 : *
1165 : * Note: In BEFORE trigger, stored generated columns are not
1166 : * computed yet, so don't make them accessible in NEW row.
1167 : */
1168 100 : if (TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
1169 : {
1170 60 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1171 : Tcl_NewStringObj("INSERT", -1));
1172 :
1173 60 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1174 : pltcl_build_tuple_argument(trigdata->tg_trigtuple,
1175 : tupdesc,
1176 60 : !TRIGGER_FIRED_BEFORE(trigdata->tg_event)));
1177 60 : Tcl_ListObjAppendElement(NULL, tcl_cmd, Tcl_NewObj());
1178 :
1179 60 : rettup = trigdata->tg_trigtuple;
1180 : }
1181 40 : else if (TRIGGER_FIRED_BY_DELETE(trigdata->tg_event))
1182 : {
1183 16 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1184 : Tcl_NewStringObj("DELETE", -1));
1185 :
1186 16 : Tcl_ListObjAppendElement(NULL, tcl_cmd, Tcl_NewObj());
1187 16 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1188 : pltcl_build_tuple_argument(trigdata->tg_trigtuple,
1189 : tupdesc,
1190 : true));
1191 :
1192 16 : rettup = trigdata->tg_trigtuple;
1193 : }
1194 24 : else if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
1195 : {
1196 24 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1197 : Tcl_NewStringObj("UPDATE", -1));
1198 :
1199 24 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1200 : pltcl_build_tuple_argument(trigdata->tg_newtuple,
1201 : tupdesc,
1202 24 : !TRIGGER_FIRED_BEFORE(trigdata->tg_event)));
1203 24 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1204 : pltcl_build_tuple_argument(trigdata->tg_trigtuple,
1205 : tupdesc,
1206 : true));
1207 :
1208 24 : rettup = trigdata->tg_newtuple;
1209 : }
1210 : else
1211 0 : elog(ERROR, "unrecognized OP tg_event: %u", trigdata->tg_event);
1212 : }
1213 16 : else if (TRIGGER_FIRED_FOR_STATEMENT(trigdata->tg_event))
1214 : {
1215 16 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1216 : Tcl_NewStringObj("STATEMENT", -1));
1217 :
1218 16 : if (TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
1219 6 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1220 : Tcl_NewStringObj("INSERT", -1));
1221 10 : else if (TRIGGER_FIRED_BY_DELETE(trigdata->tg_event))
1222 2 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1223 : Tcl_NewStringObj("DELETE", -1));
1224 8 : else if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
1225 6 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1226 : Tcl_NewStringObj("UPDATE", -1));
1227 2 : else if (TRIGGER_FIRED_BY_TRUNCATE(trigdata->tg_event))
1228 2 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1229 : Tcl_NewStringObj("TRUNCATE", -1));
1230 : else
1231 0 : elog(ERROR, "unrecognized OP tg_event: %u", trigdata->tg_event);
1232 :
1233 16 : Tcl_ListObjAppendElement(NULL, tcl_cmd, Tcl_NewObj());
1234 16 : Tcl_ListObjAppendElement(NULL, tcl_cmd, Tcl_NewObj());
1235 :
1236 16 : rettup = (HeapTuple) NULL;
1237 : }
1238 : else
1239 0 : elog(ERROR, "unrecognized LEVEL tg_event: %u", trigdata->tg_event);
1240 :
1241 : /* Finally append the arguments from CREATE TRIGGER */
1242 270 : for (i = 0; i < trigdata->tg_trigger->tgnargs; i++)
1243 154 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1244 154 : Tcl_NewStringObj(utf_e2u(trigdata->tg_trigger->tgargs[i]), -1));
1245 : }
1246 0 : PG_CATCH();
1247 : {
1248 0 : Tcl_DecrRefCount(tcl_cmd);
1249 0 : PG_RE_THROW();
1250 : }
1251 116 : PG_END_TRY();
1252 :
1253 : /************************************************************
1254 : * Call the Tcl function
1255 : *
1256 : * We assume no PG error can be thrown directly from this call.
1257 : ************************************************************/
1258 116 : tcl_rc = Tcl_EvalObjEx(interp, tcl_cmd, (TCL_EVAL_DIRECT | TCL_EVAL_GLOBAL));
1259 :
1260 : /* Release refcount to free tcl_cmd (and all subsidiary objects) */
1261 116 : Tcl_DecrRefCount(tcl_cmd);
1262 :
1263 : /************************************************************
1264 : * Check for errors reported by Tcl.
1265 : ************************************************************/
1266 116 : if (tcl_rc != TCL_OK)
1267 14 : throw_tcl_error(interp, prodesc->user_proname);
1268 :
1269 : /************************************************************
1270 : * Exit SPI environment.
1271 : ************************************************************/
1272 102 : if (SPI_finish() != SPI_OK_FINISH)
1273 0 : elog(ERROR, "SPI_finish() failed");
1274 :
1275 : /************************************************************
1276 : * The return value from the procedure might be one of
1277 : * the magic strings OK or SKIP, or a list from array get.
1278 : * We can check for OK or SKIP without worrying about encoding.
1279 : ************************************************************/
1280 102 : result = Tcl_GetStringResult(interp);
1281 :
1282 102 : if (strcmp(result, "OK") == 0)
1283 80 : return rettup;
1284 22 : if (strcmp(result, "SKIP") == 0)
1285 2 : return (HeapTuple) NULL;
1286 :
1287 : /************************************************************
1288 : * Otherwise, the return value should be a column name/value list
1289 : * specifying the modified tuple to return.
1290 : ************************************************************/
1291 20 : if (Tcl_ListObjGetElements(interp, Tcl_GetObjResult(interp),
1292 : &result_Objc, &result_Objv) != TCL_OK)
1293 0 : ereport(ERROR,
1294 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
1295 : errmsg("could not split return value from trigger: %s",
1296 : utf_u2e(Tcl_GetStringResult(interp)))));
1297 :
1298 : /* Convert function result to tuple */
1299 20 : rettup = pltcl_build_tuple_result(interp, result_Objv, result_Objc,
1300 : call_state);
1301 :
1302 18 : return rettup;
1303 : }
1304 :
1305 : /**********************************************************************
1306 : * pltcl_event_trigger_handler() - Handler for event trigger calls
1307 : **********************************************************************/
1308 : static void
1309 20 : pltcl_event_trigger_handler(PG_FUNCTION_ARGS, pltcl_call_state *call_state,
1310 : bool pltrusted)
1311 : {
1312 : pltcl_proc_desc *prodesc;
1313 : Tcl_Interp *volatile interp;
1314 20 : EventTriggerData *tdata = (EventTriggerData *) fcinfo->context;
1315 : Tcl_Obj *tcl_cmd;
1316 : int tcl_rc;
1317 :
1318 : /* Connect to SPI manager */
1319 20 : if (SPI_connect() != SPI_OK_CONNECT)
1320 0 : elog(ERROR, "could not connect to SPI manager");
1321 :
1322 : /* Find or compile the function */
1323 20 : prodesc = compile_pltcl_function(fcinfo->flinfo->fn_oid,
1324 : InvalidOid, true, pltrusted);
1325 :
1326 20 : call_state->prodesc = prodesc;
1327 20 : prodesc->fn_refcount++;
1328 :
1329 20 : interp = prodesc->interp_desc->interp;
1330 :
1331 : /* Create the tcl command and call the internal proc */
1332 20 : tcl_cmd = Tcl_NewObj();
1333 20 : Tcl_IncrRefCount(tcl_cmd);
1334 20 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1335 20 : Tcl_NewStringObj(prodesc->internal_proname, -1));
1336 20 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1337 20 : Tcl_NewStringObj(utf_e2u(tdata->event), -1));
1338 20 : Tcl_ListObjAppendElement(NULL, tcl_cmd,
1339 20 : Tcl_NewStringObj(utf_e2u(GetCommandTagName(tdata->tag)),
1340 : -1));
1341 :
1342 20 : tcl_rc = Tcl_EvalObjEx(interp, tcl_cmd, (TCL_EVAL_DIRECT | TCL_EVAL_GLOBAL));
1343 :
1344 : /* Release refcount to free tcl_cmd (and all subsidiary objects) */
1345 20 : Tcl_DecrRefCount(tcl_cmd);
1346 :
1347 : /* Check for errors reported by Tcl. */
1348 20 : if (tcl_rc != TCL_OK)
1349 0 : throw_tcl_error(interp, prodesc->user_proname);
1350 :
1351 20 : if (SPI_finish() != SPI_OK_FINISH)
1352 0 : elog(ERROR, "SPI_finish() failed");
1353 20 : }
1354 :
1355 :
1356 : /**********************************************************************
1357 : * throw_tcl_error - ereport an error returned from the Tcl interpreter
1358 : **********************************************************************/
1359 : static void
1360 90 : throw_tcl_error(Tcl_Interp *interp, const char *proname)
1361 : {
1362 : /*
1363 : * Caution is needed here because Tcl_GetVar could overwrite the
1364 : * interpreter result (even though it's not really supposed to), and we
1365 : * can't control the order of evaluation of ereport arguments. Hence, make
1366 : * real sure we have our own copy of the result string before invoking
1367 : * Tcl_GetVar.
1368 : */
1369 : char *emsg;
1370 : char *econtext;
1371 :
1372 90 : emsg = pstrdup(utf_u2e(Tcl_GetStringResult(interp)));
1373 90 : econtext = utf_u2e(Tcl_GetVar(interp, "errorInfo", TCL_GLOBAL_ONLY));
1374 90 : ereport(ERROR,
1375 : (errcode(ERRCODE_EXTERNAL_ROUTINE_EXCEPTION),
1376 : errmsg("%s", emsg),
1377 : errcontext("%s\nin PL/Tcl function \"%s\"",
1378 : econtext, proname)));
1379 : }
1380 :
1381 :
1382 : /**********************************************************************
1383 : * compile_pltcl_function - compile (or hopefully just look up) function
1384 : *
1385 : * tgreloid is the OID of the relation when compiling a trigger, or zero
1386 : * (InvalidOid) when compiling a plain function.
1387 : **********************************************************************/
1388 : static pltcl_proc_desc *
1389 432 : compile_pltcl_function(Oid fn_oid, Oid tgreloid,
1390 : bool is_event_trigger, bool pltrusted)
1391 : {
1392 : HeapTuple procTup;
1393 : Form_pg_proc procStruct;
1394 : pltcl_proc_key proc_key;
1395 : pltcl_proc_ptr *proc_ptr;
1396 : bool found;
1397 : pltcl_proc_desc *prodesc;
1398 : pltcl_proc_desc *old_prodesc;
1399 432 : volatile MemoryContext proc_cxt = NULL;
1400 : Tcl_DString proc_internal_def;
1401 : Tcl_DString proc_internal_body;
1402 :
1403 : /* We'll need the pg_proc tuple in any case... */
1404 432 : procTup = SearchSysCache1(PROCOID, ObjectIdGetDatum(fn_oid));
1405 432 : if (!HeapTupleIsValid(procTup))
1406 0 : elog(ERROR, "cache lookup failed for function %u", fn_oid);
1407 432 : procStruct = (Form_pg_proc) GETSTRUCT(procTup);
1408 :
1409 : /*
1410 : * Look up function in pltcl_proc_htab; if it's not there, create an entry
1411 : * and set the entry's proc_ptr to NULL.
1412 : */
1413 432 : proc_key.proc_id = fn_oid;
1414 432 : proc_key.is_trigger = OidIsValid(tgreloid);
1415 432 : proc_key.user_id = pltrusted ? GetUserId() : InvalidOid;
1416 :
1417 432 : proc_ptr = hash_search(pltcl_proc_htab, &proc_key,
1418 : HASH_ENTER,
1419 : &found);
1420 432 : if (!found)
1421 112 : proc_ptr->proc_ptr = NULL;
1422 :
1423 432 : prodesc = proc_ptr->proc_ptr;
1424 :
1425 : /************************************************************
1426 : * If it's present, must check whether it's still up to date.
1427 : * This is needed because CREATE OR REPLACE FUNCTION can modify the
1428 : * function's pg_proc entry without changing its OID.
1429 : ************************************************************/
1430 432 : if (prodesc != NULL &&
1431 314 : prodesc->fn_xmin == HeapTupleHeaderGetRawXmin(procTup->t_data) &&
1432 312 : ItemPointerEquals(&prodesc->fn_tid, &procTup->t_self))
1433 : {
1434 : /* It's still up-to-date, so we can use it */
1435 312 : ReleaseSysCache(procTup);
1436 312 : return prodesc;
1437 : }
1438 :
1439 : /************************************************************
1440 : * If we haven't found it in the hashtable, we analyze
1441 : * the functions arguments and returntype and store
1442 : * the in-/out-functions in the prodesc block and create
1443 : * a new hashtable entry for it.
1444 : *
1445 : * Then we load the procedure into the Tcl interpreter.
1446 : ************************************************************/
1447 120 : Tcl_DStringInit(&proc_internal_def);
1448 120 : Tcl_DStringInit(&proc_internal_body);
1449 120 : PG_TRY();
1450 : {
1451 120 : bool is_trigger = OidIsValid(tgreloid);
1452 : char internal_proname[128];
1453 : HeapTuple typeTup;
1454 : Form_pg_type typeStruct;
1455 : char proc_internal_args[33 * FUNC_MAX_ARGS];
1456 : Datum prosrcdatum;
1457 : char *proc_source;
1458 : char buf[48];
1459 : Tcl_Interp *interp;
1460 : int i;
1461 : int tcl_rc;
1462 : MemoryContext oldcontext;
1463 :
1464 : /************************************************************
1465 : * Build our internal proc name from the function's Oid. Append
1466 : * "_trigger" when appropriate to ensure the normal and trigger
1467 : * cases are kept separate. Note name must be all-ASCII.
1468 : ************************************************************/
1469 120 : if (is_event_trigger)
1470 2 : snprintf(internal_proname, sizeof(internal_proname),
1471 : "__PLTcl_proc_%u_evttrigger", fn_oid);
1472 118 : else if (is_trigger)
1473 16 : snprintf(internal_proname, sizeof(internal_proname),
1474 : "__PLTcl_proc_%u_trigger", fn_oid);
1475 : else
1476 102 : snprintf(internal_proname, sizeof(internal_proname),
1477 : "__PLTcl_proc_%u", fn_oid);
1478 :
1479 : /************************************************************
1480 : * Allocate a context that will hold all PG data for the procedure.
1481 : ************************************************************/
1482 120 : proc_cxt = AllocSetContextCreate(TopMemoryContext,
1483 : "PL/Tcl function",
1484 : ALLOCSET_SMALL_SIZES);
1485 :
1486 : /************************************************************
1487 : * Allocate and fill a new procedure description block.
1488 : * struct prodesc and subsidiary data must all live in proc_cxt.
1489 : ************************************************************/
1490 120 : oldcontext = MemoryContextSwitchTo(proc_cxt);
1491 120 : prodesc = (pltcl_proc_desc *) palloc0(sizeof(pltcl_proc_desc));
1492 120 : prodesc->user_proname = pstrdup(NameStr(procStruct->proname));
1493 120 : MemoryContextSetIdentifier(proc_cxt, prodesc->user_proname);
1494 120 : prodesc->internal_proname = pstrdup(internal_proname);
1495 120 : prodesc->fn_cxt = proc_cxt;
1496 120 : prodesc->fn_refcount = 0;
1497 120 : prodesc->fn_xmin = HeapTupleHeaderGetRawXmin(procTup->t_data);
1498 120 : prodesc->fn_tid = procTup->t_self;
1499 120 : prodesc->nargs = procStruct->pronargs;
1500 120 : prodesc->arg_out_func = (FmgrInfo *) palloc0(prodesc->nargs * sizeof(FmgrInfo));
1501 120 : prodesc->arg_is_rowtype = (bool *) palloc0(prodesc->nargs * sizeof(bool));
1502 120 : MemoryContextSwitchTo(oldcontext);
1503 :
1504 : /* Remember if function is STABLE/IMMUTABLE */
1505 120 : prodesc->fn_readonly =
1506 120 : (procStruct->provolatile != PROVOLATILE_VOLATILE);
1507 : /* And whether it is trusted */
1508 120 : prodesc->lanpltrusted = pltrusted;
1509 :
1510 : /************************************************************
1511 : * Identify the interpreter to use for the function
1512 : ************************************************************/
1513 234 : prodesc->interp_desc = pltcl_fetch_interp(procStruct->prolang,
1514 120 : prodesc->lanpltrusted);
1515 114 : interp = prodesc->interp_desc->interp;
1516 :
1517 : /************************************************************
1518 : * Get the required information for input conversion of the
1519 : * return value.
1520 : ************************************************************/
1521 114 : if (!is_trigger && !is_event_trigger)
1522 : {
1523 96 : Oid rettype = procStruct->prorettype;
1524 :
1525 96 : typeTup = SearchSysCache1(TYPEOID, ObjectIdGetDatum(rettype));
1526 96 : if (!HeapTupleIsValid(typeTup))
1527 0 : elog(ERROR, "cache lookup failed for type %u", rettype);
1528 96 : typeStruct = (Form_pg_type) GETSTRUCT(typeTup);
1529 :
1530 : /* Disallow pseudotype result, except VOID and RECORD */
1531 96 : if (typeStruct->typtype == TYPTYPE_PSEUDO)
1532 : {
1533 46 : if (rettype == VOIDOID ||
1534 : rettype == RECORDOID)
1535 : /* okay */ ;
1536 0 : else if (rettype == TRIGGEROID ||
1537 : rettype == EVENT_TRIGGEROID)
1538 0 : ereport(ERROR,
1539 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1540 : errmsg("trigger functions can only be called as triggers")));
1541 : else
1542 0 : ereport(ERROR,
1543 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1544 : errmsg("PL/Tcl functions cannot return type %s",
1545 : format_type_be(rettype))));
1546 : }
1547 :
1548 96 : prodesc->result_typid = rettype;
1549 96 : fmgr_info_cxt(typeStruct->typinput,
1550 : &(prodesc->result_in_func),
1551 : proc_cxt);
1552 96 : prodesc->result_typioparam = getTypeIOParam(typeTup);
1553 :
1554 96 : prodesc->fn_retisset = procStruct->proretset;
1555 96 : prodesc->fn_retistuple = type_is_rowtype(rettype);
1556 96 : prodesc->fn_retisdomain = (typeStruct->typtype == TYPTYPE_DOMAIN);
1557 96 : prodesc->domain_info = NULL;
1558 :
1559 96 : ReleaseSysCache(typeTup);
1560 : }
1561 :
1562 : /************************************************************
1563 : * Get the required information for output conversion
1564 : * of all procedure arguments, and set up argument naming info.
1565 : ************************************************************/
1566 114 : if (!is_trigger && !is_event_trigger)
1567 : {
1568 96 : proc_internal_args[0] = '\0';
1569 182 : for (i = 0; i < prodesc->nargs; i++)
1570 : {
1571 86 : Oid argtype = procStruct->proargtypes.values[i];
1572 :
1573 86 : typeTup = SearchSysCache1(TYPEOID, ObjectIdGetDatum(argtype));
1574 86 : if (!HeapTupleIsValid(typeTup))
1575 0 : elog(ERROR, "cache lookup failed for type %u", argtype);
1576 86 : typeStruct = (Form_pg_type) GETSTRUCT(typeTup);
1577 :
1578 : /* Disallow pseudotype argument, except RECORD */
1579 86 : if (typeStruct->typtype == TYPTYPE_PSEUDO &&
1580 : argtype != RECORDOID)
1581 0 : ereport(ERROR,
1582 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
1583 : errmsg("PL/Tcl functions cannot accept type %s",
1584 : format_type_be(argtype))));
1585 :
1586 86 : if (type_is_rowtype(argtype))
1587 : {
1588 8 : prodesc->arg_is_rowtype[i] = true;
1589 8 : snprintf(buf, sizeof(buf), "__PLTcl_Tup_%d", i + 1);
1590 : }
1591 : else
1592 : {
1593 78 : prodesc->arg_is_rowtype[i] = false;
1594 78 : fmgr_info_cxt(typeStruct->typoutput,
1595 78 : &(prodesc->arg_out_func[i]),
1596 : proc_cxt);
1597 78 : snprintf(buf, sizeof(buf), "%d", i + 1);
1598 : }
1599 :
1600 86 : if (i > 0)
1601 28 : strcat(proc_internal_args, " ");
1602 86 : strcat(proc_internal_args, buf);
1603 :
1604 86 : ReleaseSysCache(typeTup);
1605 : }
1606 : }
1607 18 : else if (is_trigger)
1608 : {
1609 : /* trigger procedure has fixed args */
1610 16 : strcpy(proc_internal_args,
1611 : "TG_name TG_relid TG_table_name TG_table_schema TG_relatts TG_when TG_level TG_op __PLTcl_Tup_NEW __PLTcl_Tup_OLD args");
1612 : }
1613 2 : else if (is_event_trigger)
1614 : {
1615 : /* event trigger procedure has fixed args */
1616 2 : strcpy(proc_internal_args, "TG_event TG_tag");
1617 : }
1618 :
1619 : /************************************************************
1620 : * Create the tcl command to define the internal
1621 : * procedure
1622 : *
1623 : * Leave this code as DString - performance is not critical here,
1624 : * and we don't want to duplicate the knowledge of the Tcl quoting
1625 : * rules that's embedded in Tcl_DStringAppendElement.
1626 : ************************************************************/
1627 114 : Tcl_DStringAppendElement(&proc_internal_def, "proc");
1628 114 : Tcl_DStringAppendElement(&proc_internal_def, internal_proname);
1629 114 : Tcl_DStringAppendElement(&proc_internal_def, proc_internal_args);
1630 :
1631 : /************************************************************
1632 : * prefix procedure body with
1633 : * upvar #0 <internal_proname> GD
1634 : * and with appropriate setting of arguments
1635 : ************************************************************/
1636 114 : Tcl_DStringAppend(&proc_internal_body, "upvar #0 ", -1);
1637 114 : Tcl_DStringAppend(&proc_internal_body, internal_proname, -1);
1638 114 : Tcl_DStringAppend(&proc_internal_body, " GD\n", -1);
1639 114 : if (is_trigger)
1640 : {
1641 16 : Tcl_DStringAppend(&proc_internal_body,
1642 : "array set NEW $__PLTcl_Tup_NEW\n", -1);
1643 16 : Tcl_DStringAppend(&proc_internal_body,
1644 : "array set OLD $__PLTcl_Tup_OLD\n", -1);
1645 16 : Tcl_DStringAppend(&proc_internal_body,
1646 : "set i 0\n"
1647 : "set v 0\n"
1648 : "foreach v $args {\n"
1649 : " incr i\n"
1650 : " set $i $v\n"
1651 : "}\n"
1652 : "unset i v\n\n", -1);
1653 : }
1654 98 : else if (is_event_trigger)
1655 : {
1656 : /* no argument support for event triggers */
1657 : }
1658 : else
1659 : {
1660 182 : for (i = 0; i < prodesc->nargs; i++)
1661 : {
1662 86 : if (prodesc->arg_is_rowtype[i])
1663 : {
1664 8 : snprintf(buf, sizeof(buf),
1665 : "array set %d $__PLTcl_Tup_%d\n",
1666 : i + 1, i + 1);
1667 8 : Tcl_DStringAppend(&proc_internal_body, buf, -1);
1668 : }
1669 : }
1670 : }
1671 :
1672 : /************************************************************
1673 : * Add user's function definition to proc body
1674 : ************************************************************/
1675 114 : prosrcdatum = SysCacheGetAttrNotNull(PROCOID, procTup,
1676 : Anum_pg_proc_prosrc);
1677 114 : proc_source = TextDatumGetCString(prosrcdatum);
1678 114 : UTF_BEGIN;
1679 114 : Tcl_DStringAppend(&proc_internal_body, UTF_E2U(proc_source), -1);
1680 114 : UTF_END;
1681 114 : pfree(proc_source);
1682 114 : Tcl_DStringAppendElement(&proc_internal_def,
1683 114 : Tcl_DStringValue(&proc_internal_body));
1684 :
1685 : /************************************************************
1686 : * Create the procedure in the interpreter
1687 : ************************************************************/
1688 228 : tcl_rc = Tcl_EvalEx(interp,
1689 114 : Tcl_DStringValue(&proc_internal_def),
1690 : Tcl_DStringLength(&proc_internal_def),
1691 : TCL_EVAL_GLOBAL);
1692 114 : if (tcl_rc != TCL_OK)
1693 0 : ereport(ERROR,
1694 : (errcode(ERRCODE_EXTERNAL_ROUTINE_EXCEPTION),
1695 : errmsg("could not create internal procedure \"%s\": %s",
1696 : internal_proname,
1697 : utf_u2e(Tcl_GetStringResult(interp)))));
1698 : }
1699 6 : PG_CATCH();
1700 : {
1701 : /*
1702 : * If we failed anywhere above, clean up whatever got allocated. It
1703 : * should all be in the proc_cxt, except for the DStrings.
1704 : */
1705 6 : if (proc_cxt)
1706 6 : MemoryContextDelete(proc_cxt);
1707 6 : Tcl_DStringFree(&proc_internal_def);
1708 6 : Tcl_DStringFree(&proc_internal_body);
1709 6 : PG_RE_THROW();
1710 : }
1711 114 : PG_END_TRY();
1712 :
1713 : /*
1714 : * Install the new proc description block in the hashtable, incrementing
1715 : * its refcount (the hashtable link counts as a reference). Then, if
1716 : * there was a previous definition of the function, decrement that one's
1717 : * refcount, and delete it if no longer referenced. The order of
1718 : * operations here is important: if something goes wrong during the
1719 : * MemoryContextDelete, leaking some memory for the old definition is OK,
1720 : * but we don't want to corrupt the live hashtable entry. (Likewise,
1721 : * freeing the DStrings is pretty low priority if that happens.)
1722 : */
1723 114 : old_prodesc = proc_ptr->proc_ptr;
1724 :
1725 114 : proc_ptr->proc_ptr = prodesc;
1726 114 : prodesc->fn_refcount++;
1727 :
1728 114 : if (old_prodesc != NULL)
1729 : {
1730 : Assert(old_prodesc->fn_refcount > 0);
1731 2 : if (--old_prodesc->fn_refcount == 0)
1732 2 : MemoryContextDelete(old_prodesc->fn_cxt);
1733 : }
1734 :
1735 114 : Tcl_DStringFree(&proc_internal_def);
1736 114 : Tcl_DStringFree(&proc_internal_body);
1737 :
1738 114 : ReleaseSysCache(procTup);
1739 :
1740 114 : return prodesc;
1741 : }
1742 :
1743 :
1744 : /**********************************************************************
1745 : * pltcl_elog() - elog() support for PLTcl
1746 : **********************************************************************/
1747 : static int
1748 532 : pltcl_elog(ClientData cdata, Tcl_Interp *interp,
1749 : int objc, Tcl_Obj *const objv[])
1750 : {
1751 : volatile int level;
1752 : MemoryContext oldcontext;
1753 : int priIndex;
1754 :
1755 : static const char *logpriorities[] = {
1756 : "DEBUG", "LOG", "INFO", "NOTICE",
1757 : "WARNING", "ERROR", "FATAL", (const char *) NULL
1758 : };
1759 :
1760 : static const int loglevels[] = {
1761 : DEBUG2, LOG, INFO, NOTICE,
1762 : WARNING, ERROR, FATAL
1763 : };
1764 :
1765 532 : if (objc != 3)
1766 : {
1767 2 : Tcl_WrongNumArgs(interp, 1, objv, "level msg");
1768 2 : return TCL_ERROR;
1769 : }
1770 :
1771 530 : if (Tcl_GetIndexFromObj(interp, objv[1], logpriorities, "priority",
1772 : TCL_EXACT, &priIndex) != TCL_OK)
1773 2 : return TCL_ERROR;
1774 :
1775 528 : level = loglevels[priIndex];
1776 :
1777 528 : if (level == ERROR)
1778 : {
1779 : /*
1780 : * We just pass the error back to Tcl. If it's not caught, it'll
1781 : * eventually get converted to a PG error when we reach the call
1782 : * handler.
1783 : */
1784 12 : Tcl_SetObjResult(interp, objv[2]);
1785 12 : return TCL_ERROR;
1786 : }
1787 :
1788 : /*
1789 : * For non-error messages, just pass 'em to ereport(). We do not expect
1790 : * that this will fail, but just on the off chance it does, report the
1791 : * error back to Tcl. Note we are assuming that ereport() can't have any
1792 : * internal failures that are so bad as to require a transaction abort.
1793 : *
1794 : * This path is also used for FATAL errors, which aren't going to come
1795 : * back to us at all.
1796 : */
1797 516 : oldcontext = CurrentMemoryContext;
1798 516 : PG_TRY();
1799 : {
1800 516 : UTF_BEGIN;
1801 516 : ereport(level,
1802 : (errcode(ERRCODE_EXTERNAL_ROUTINE_EXCEPTION),
1803 : errmsg("%s", UTF_U2E(Tcl_GetString(objv[2])))));
1804 516 : UTF_END;
1805 : }
1806 0 : PG_CATCH();
1807 : {
1808 : ErrorData *edata;
1809 :
1810 : /* Must reset elog.c's state */
1811 0 : MemoryContextSwitchTo(oldcontext);
1812 0 : edata = CopyErrorData();
1813 0 : FlushErrorState();
1814 :
1815 : /* Pass the error data to Tcl */
1816 0 : pltcl_construct_errorCode(interp, edata);
1817 0 : UTF_BEGIN;
1818 0 : Tcl_SetObjResult(interp, Tcl_NewStringObj(UTF_E2U(edata->message), -1));
1819 0 : UTF_END;
1820 0 : FreeErrorData(edata);
1821 :
1822 0 : return TCL_ERROR;
1823 : }
1824 516 : PG_END_TRY();
1825 :
1826 516 : return TCL_OK;
1827 : }
1828 :
1829 :
1830 : /**********************************************************************
1831 : * pltcl_construct_errorCode() - construct a Tcl errorCode
1832 : * list with detailed information from the PostgreSQL server
1833 : **********************************************************************/
1834 : static void
1835 36 : pltcl_construct_errorCode(Tcl_Interp *interp, ErrorData *edata)
1836 : {
1837 36 : Tcl_Obj *obj = Tcl_NewObj();
1838 :
1839 36 : Tcl_ListObjAppendElement(interp, obj,
1840 : Tcl_NewStringObj("POSTGRES", -1));
1841 36 : Tcl_ListObjAppendElement(interp, obj,
1842 : Tcl_NewStringObj(PG_VERSION, -1));
1843 36 : Tcl_ListObjAppendElement(interp, obj,
1844 : Tcl_NewStringObj("SQLSTATE", -1));
1845 36 : Tcl_ListObjAppendElement(interp, obj,
1846 36 : Tcl_NewStringObj(unpack_sql_state(edata->sqlerrcode), -1));
1847 36 : Tcl_ListObjAppendElement(interp, obj,
1848 : Tcl_NewStringObj("condition", -1));
1849 36 : Tcl_ListObjAppendElement(interp, obj,
1850 : Tcl_NewStringObj(pltcl_get_condition_name(edata->sqlerrcode), -1));
1851 36 : Tcl_ListObjAppendElement(interp, obj,
1852 : Tcl_NewStringObj("message", -1));
1853 36 : UTF_BEGIN;
1854 36 : Tcl_ListObjAppendElement(interp, obj,
1855 36 : Tcl_NewStringObj(UTF_E2U(edata->message), -1));
1856 36 : UTF_END;
1857 36 : if (edata->detail)
1858 : {
1859 6 : Tcl_ListObjAppendElement(interp, obj,
1860 : Tcl_NewStringObj("detail", -1));
1861 6 : UTF_BEGIN;
1862 6 : Tcl_ListObjAppendElement(interp, obj,
1863 6 : Tcl_NewStringObj(UTF_E2U(edata->detail), -1));
1864 6 : UTF_END;
1865 : }
1866 36 : if (edata->hint)
1867 : {
1868 2 : Tcl_ListObjAppendElement(interp, obj,
1869 : Tcl_NewStringObj("hint", -1));
1870 2 : UTF_BEGIN;
1871 2 : Tcl_ListObjAppendElement(interp, obj,
1872 2 : Tcl_NewStringObj(UTF_E2U(edata->hint), -1));
1873 2 : UTF_END;
1874 : }
1875 36 : if (edata->context)
1876 : {
1877 18 : Tcl_ListObjAppendElement(interp, obj,
1878 : Tcl_NewStringObj("context", -1));
1879 18 : UTF_BEGIN;
1880 18 : Tcl_ListObjAppendElement(interp, obj,
1881 18 : Tcl_NewStringObj(UTF_E2U(edata->context), -1));
1882 18 : UTF_END;
1883 : }
1884 36 : if (edata->schema_name)
1885 : {
1886 6 : Tcl_ListObjAppendElement(interp, obj,
1887 : Tcl_NewStringObj("schema", -1));
1888 6 : UTF_BEGIN;
1889 6 : Tcl_ListObjAppendElement(interp, obj,
1890 6 : Tcl_NewStringObj(UTF_E2U(edata->schema_name), -1));
1891 6 : UTF_END;
1892 : }
1893 36 : if (edata->table_name)
1894 : {
1895 6 : Tcl_ListObjAppendElement(interp, obj,
1896 : Tcl_NewStringObj("table", -1));
1897 6 : UTF_BEGIN;
1898 6 : Tcl_ListObjAppendElement(interp, obj,
1899 6 : Tcl_NewStringObj(UTF_E2U(edata->table_name), -1));
1900 6 : UTF_END;
1901 : }
1902 36 : if (edata->column_name)
1903 : {
1904 2 : Tcl_ListObjAppendElement(interp, obj,
1905 : Tcl_NewStringObj("column", -1));
1906 2 : UTF_BEGIN;
1907 2 : Tcl_ListObjAppendElement(interp, obj,
1908 2 : Tcl_NewStringObj(UTF_E2U(edata->column_name), -1));
1909 2 : UTF_END;
1910 : }
1911 36 : if (edata->datatype_name)
1912 : {
1913 2 : Tcl_ListObjAppendElement(interp, obj,
1914 : Tcl_NewStringObj("datatype", -1));
1915 2 : UTF_BEGIN;
1916 2 : Tcl_ListObjAppendElement(interp, obj,
1917 2 : Tcl_NewStringObj(UTF_E2U(edata->datatype_name), -1));
1918 2 : UTF_END;
1919 : }
1920 36 : if (edata->constraint_name)
1921 : {
1922 6 : Tcl_ListObjAppendElement(interp, obj,
1923 : Tcl_NewStringObj("constraint", -1));
1924 6 : UTF_BEGIN;
1925 6 : Tcl_ListObjAppendElement(interp, obj,
1926 6 : Tcl_NewStringObj(UTF_E2U(edata->constraint_name), -1));
1927 6 : UTF_END;
1928 : }
1929 : /* cursorpos is never interesting here; report internal query/pos */
1930 36 : if (edata->internalquery)
1931 : {
1932 8 : Tcl_ListObjAppendElement(interp, obj,
1933 : Tcl_NewStringObj("statement", -1));
1934 8 : UTF_BEGIN;
1935 8 : Tcl_ListObjAppendElement(interp, obj,
1936 8 : Tcl_NewStringObj(UTF_E2U(edata->internalquery), -1));
1937 8 : UTF_END;
1938 : }
1939 36 : if (edata->internalpos > 0)
1940 : {
1941 8 : Tcl_ListObjAppendElement(interp, obj,
1942 : Tcl_NewStringObj("cursor_position", -1));
1943 8 : Tcl_ListObjAppendElement(interp, obj,
1944 : Tcl_NewIntObj(edata->internalpos));
1945 : }
1946 36 : if (edata->filename)
1947 : {
1948 36 : Tcl_ListObjAppendElement(interp, obj,
1949 : Tcl_NewStringObj("filename", -1));
1950 36 : UTF_BEGIN;
1951 36 : Tcl_ListObjAppendElement(interp, obj,
1952 36 : Tcl_NewStringObj(UTF_E2U(edata->filename), -1));
1953 36 : UTF_END;
1954 : }
1955 36 : if (edata->lineno > 0)
1956 : {
1957 36 : Tcl_ListObjAppendElement(interp, obj,
1958 : Tcl_NewStringObj("lineno", -1));
1959 36 : Tcl_ListObjAppendElement(interp, obj,
1960 : Tcl_NewIntObj(edata->lineno));
1961 : }
1962 36 : if (edata->funcname)
1963 : {
1964 36 : Tcl_ListObjAppendElement(interp, obj,
1965 : Tcl_NewStringObj("funcname", -1));
1966 36 : UTF_BEGIN;
1967 36 : Tcl_ListObjAppendElement(interp, obj,
1968 36 : Tcl_NewStringObj(UTF_E2U(edata->funcname), -1));
1969 36 : UTF_END;
1970 : }
1971 :
1972 36 : Tcl_SetObjErrorCode(interp, obj);
1973 36 : }
1974 :
1975 :
1976 : /**********************************************************************
1977 : * pltcl_get_condition_name() - find name for SQLSTATE
1978 : **********************************************************************/
1979 : static const char *
1980 36 : pltcl_get_condition_name(int sqlstate)
1981 : {
1982 : int i;
1983 :
1984 4520 : for (i = 0; exception_name_map[i].label != NULL; i++)
1985 : {
1986 4520 : if (exception_name_map[i].sqlerrstate == sqlstate)
1987 36 : return exception_name_map[i].label;
1988 : }
1989 0 : return "unrecognized_sqlstate";
1990 : }
1991 :
1992 :
1993 : /**********************************************************************
1994 : * pltcl_quote() - quote literal strings that are to
1995 : * be used in SPI_execute query strings
1996 : **********************************************************************/
1997 : static int
1998 22 : pltcl_quote(ClientData cdata, Tcl_Interp *interp,
1999 : int objc, Tcl_Obj *const objv[])
2000 : {
2001 : char *tmp;
2002 : const char *cp1;
2003 : char *cp2;
2004 : int length;
2005 :
2006 : /************************************************************
2007 : * Check call syntax
2008 : ************************************************************/
2009 22 : if (objc != 2)
2010 : {
2011 2 : Tcl_WrongNumArgs(interp, 1, objv, "string");
2012 2 : return TCL_ERROR;
2013 : }
2014 :
2015 : /************************************************************
2016 : * Allocate space for the maximum the string can
2017 : * grow to and initialize pointers
2018 : ************************************************************/
2019 20 : cp1 = Tcl_GetStringFromObj(objv[1], &length);
2020 20 : tmp = palloc(length * 2 + 1);
2021 20 : cp2 = tmp;
2022 :
2023 : /************************************************************
2024 : * Walk through string and double every quote and backslash
2025 : ************************************************************/
2026 112 : while (*cp1)
2027 : {
2028 92 : if (*cp1 == '\'')
2029 2 : *cp2++ = '\'';
2030 : else
2031 : {
2032 90 : if (*cp1 == '\\')
2033 2 : *cp2++ = '\\';
2034 : }
2035 92 : *cp2++ = *cp1++;
2036 : }
2037 :
2038 : /************************************************************
2039 : * Terminate the string and set it as result
2040 : ************************************************************/
2041 20 : *cp2 = '\0';
2042 20 : Tcl_SetObjResult(interp, Tcl_NewStringObj(tmp, -1));
2043 20 : pfree(tmp);
2044 20 : return TCL_OK;
2045 : }
2046 :
2047 :
2048 : /**********************************************************************
2049 : * pltcl_argisnull() - determine if a specific argument is NULL
2050 : **********************************************************************/
2051 : static int
2052 14 : pltcl_argisnull(ClientData cdata, Tcl_Interp *interp,
2053 : int objc, Tcl_Obj *const objv[])
2054 : {
2055 : int argno;
2056 14 : FunctionCallInfo fcinfo = pltcl_current_call_state->fcinfo;
2057 :
2058 : /************************************************************
2059 : * Check call syntax
2060 : ************************************************************/
2061 14 : if (objc != 2)
2062 : {
2063 2 : Tcl_WrongNumArgs(interp, 1, objv, "argno");
2064 2 : return TCL_ERROR;
2065 : }
2066 :
2067 : /************************************************************
2068 : * Check that we're called as a normal function
2069 : ************************************************************/
2070 12 : if (fcinfo == NULL)
2071 : {
2072 2 : Tcl_SetObjResult(interp,
2073 : Tcl_NewStringObj("argisnull cannot be used in triggers", -1));
2074 2 : return TCL_ERROR;
2075 : }
2076 :
2077 : /************************************************************
2078 : * Get the argument number
2079 : ************************************************************/
2080 10 : if (Tcl_GetIntFromObj(interp, objv[1], &argno) != TCL_OK)
2081 2 : return TCL_ERROR;
2082 :
2083 : /************************************************************
2084 : * Check that the argno is valid
2085 : ************************************************************/
2086 8 : argno--;
2087 8 : if (argno < 0 || argno >= fcinfo->nargs)
2088 : {
2089 2 : Tcl_SetObjResult(interp,
2090 : Tcl_NewStringObj("argno out of range", -1));
2091 2 : return TCL_ERROR;
2092 : }
2093 :
2094 : /************************************************************
2095 : * Get the requested NULL state
2096 : ************************************************************/
2097 6 : Tcl_SetObjResult(interp, Tcl_NewBooleanObj(PG_ARGISNULL(argno)));
2098 6 : return TCL_OK;
2099 : }
2100 :
2101 :
2102 : /**********************************************************************
2103 : * pltcl_returnnull() - Cause a NULL return from the current function
2104 : **********************************************************************/
2105 : static int
2106 6 : pltcl_returnnull(ClientData cdata, Tcl_Interp *interp,
2107 : int objc, Tcl_Obj *const objv[])
2108 : {
2109 6 : FunctionCallInfo fcinfo = pltcl_current_call_state->fcinfo;
2110 :
2111 : /************************************************************
2112 : * Check call syntax
2113 : ************************************************************/
2114 6 : if (objc != 1)
2115 : {
2116 2 : Tcl_WrongNumArgs(interp, 1, objv, "");
2117 2 : return TCL_ERROR;
2118 : }
2119 :
2120 : /************************************************************
2121 : * Check that we're called as a normal function
2122 : ************************************************************/
2123 4 : if (fcinfo == NULL)
2124 : {
2125 2 : Tcl_SetObjResult(interp,
2126 : Tcl_NewStringObj("return_null cannot be used in triggers", -1));
2127 2 : return TCL_ERROR;
2128 : }
2129 :
2130 : /************************************************************
2131 : * Set the NULL return flag and cause Tcl to return from the
2132 : * procedure.
2133 : ************************************************************/
2134 2 : fcinfo->isnull = true;
2135 :
2136 2 : return TCL_RETURN;
2137 : }
2138 :
2139 :
2140 : /**********************************************************************
2141 : * pltcl_returnnext() - Add a row to the result tuplestore in a SRF.
2142 : **********************************************************************/
2143 : static int
2144 36 : pltcl_returnnext(ClientData cdata, Tcl_Interp *interp,
2145 : int objc, Tcl_Obj *const objv[])
2146 : {
2147 36 : pltcl_call_state *call_state = pltcl_current_call_state;
2148 36 : FunctionCallInfo fcinfo = call_state->fcinfo;
2149 36 : pltcl_proc_desc *prodesc = call_state->prodesc;
2150 36 : MemoryContext oldcontext = CurrentMemoryContext;
2151 36 : ResourceOwner oldowner = CurrentResourceOwner;
2152 36 : volatile int result = TCL_OK;
2153 :
2154 : /*
2155 : * Check that we're called as a set-returning function
2156 : */
2157 36 : if (fcinfo == NULL)
2158 : {
2159 0 : Tcl_SetObjResult(interp,
2160 : Tcl_NewStringObj("return_next cannot be used in triggers", -1));
2161 0 : return TCL_ERROR;
2162 : }
2163 :
2164 36 : if (!prodesc->fn_retisset)
2165 : {
2166 2 : Tcl_SetObjResult(interp,
2167 : Tcl_NewStringObj("return_next cannot be used in non-set-returning functions", -1));
2168 2 : return TCL_ERROR;
2169 : }
2170 :
2171 : /*
2172 : * Check call syntax
2173 : */
2174 34 : if (objc != 2)
2175 : {
2176 0 : Tcl_WrongNumArgs(interp, 1, objv, "result");
2177 0 : return TCL_ERROR;
2178 : }
2179 :
2180 : /*
2181 : * The rest might throw elog(ERROR), so must run in a subtransaction.
2182 : *
2183 : * A small advantage of using a subtransaction is that it provides a
2184 : * short-lived memory context for free, so we needn't worry about leaking
2185 : * memory here. To use that context, call BeginInternalSubTransaction
2186 : * directly instead of going through pltcl_subtrans_begin.
2187 : */
2188 34 : BeginInternalSubTransaction(NULL);
2189 34 : PG_TRY();
2190 : {
2191 : /* Set up tuple store if first output row */
2192 34 : if (call_state->tuple_store == NULL)
2193 10 : pltcl_init_tuple_store(call_state);
2194 :
2195 34 : if (prodesc->fn_retistuple)
2196 : {
2197 : Tcl_Obj **rowObjv;
2198 : int rowObjc;
2199 :
2200 : /* result should be a list, so break it down */
2201 14 : if (Tcl_ListObjGetElements(interp, objv[1], &rowObjc, &rowObjv) == TCL_ERROR)
2202 0 : result = TCL_ERROR;
2203 : else
2204 : {
2205 : HeapTuple tuple;
2206 :
2207 14 : tuple = pltcl_build_tuple_result(interp, rowObjv, rowObjc,
2208 : call_state);
2209 10 : tuplestore_puttuple(call_state->tuple_store, tuple);
2210 : }
2211 : }
2212 : else
2213 : {
2214 : Datum retval;
2215 20 : bool isNull = false;
2216 :
2217 : /* for paranoia's sake, check that tupdesc has exactly one column */
2218 20 : if (call_state->ret_tupdesc->natts != 1)
2219 0 : elog(ERROR, "wrong result type supplied in return_next");
2220 :
2221 20 : retval = InputFunctionCall(&prodesc->result_in_func,
2222 20 : utf_u2e((char *) Tcl_GetString(objv[1])),
2223 : prodesc->result_typioparam,
2224 : -1);
2225 20 : tuplestore_putvalues(call_state->tuple_store, call_state->ret_tupdesc,
2226 : &retval, &isNull);
2227 : }
2228 :
2229 30 : pltcl_subtrans_commit(oldcontext, oldowner);
2230 : }
2231 4 : PG_CATCH();
2232 : {
2233 4 : pltcl_subtrans_abort(interp, oldcontext, oldowner);
2234 4 : return TCL_ERROR;
2235 : }
2236 30 : PG_END_TRY();
2237 :
2238 30 : return result;
2239 : }
2240 :
2241 :
2242 : /*----------
2243 : * Support for running SPI operations inside subtransactions
2244 : *
2245 : * Intended usage pattern is:
2246 : *
2247 : * MemoryContext oldcontext = CurrentMemoryContext;
2248 : * ResourceOwner oldowner = CurrentResourceOwner;
2249 : *
2250 : * ...
2251 : * pltcl_subtrans_begin(oldcontext, oldowner);
2252 : * PG_TRY();
2253 : * {
2254 : * do something risky;
2255 : * pltcl_subtrans_commit(oldcontext, oldowner);
2256 : * }
2257 : * PG_CATCH();
2258 : * {
2259 : * pltcl_subtrans_abort(interp, oldcontext, oldowner);
2260 : * return TCL_ERROR;
2261 : * }
2262 : * PG_END_TRY();
2263 : * return TCL_OK;
2264 : *----------
2265 : */
2266 : static void
2267 244 : pltcl_subtrans_begin(MemoryContext oldcontext, ResourceOwner oldowner)
2268 : {
2269 244 : BeginInternalSubTransaction(NULL);
2270 :
2271 : /* Want to run inside function's memory context */
2272 244 : MemoryContextSwitchTo(oldcontext);
2273 244 : }
2274 :
2275 : static void
2276 254 : pltcl_subtrans_commit(MemoryContext oldcontext, ResourceOwner oldowner)
2277 : {
2278 : /* Commit the inner transaction, return to outer xact context */
2279 254 : ReleaseCurrentSubTransaction();
2280 254 : MemoryContextSwitchTo(oldcontext);
2281 254 : CurrentResourceOwner = oldowner;
2282 254 : }
2283 :
2284 : static void
2285 24 : pltcl_subtrans_abort(Tcl_Interp *interp,
2286 : MemoryContext oldcontext, ResourceOwner oldowner)
2287 : {
2288 : ErrorData *edata;
2289 :
2290 : /* Save error info */
2291 24 : MemoryContextSwitchTo(oldcontext);
2292 24 : edata = CopyErrorData();
2293 24 : FlushErrorState();
2294 :
2295 : /* Abort the inner transaction */
2296 24 : RollbackAndReleaseCurrentSubTransaction();
2297 24 : MemoryContextSwitchTo(oldcontext);
2298 24 : CurrentResourceOwner = oldowner;
2299 :
2300 : /* Pass the error data to Tcl */
2301 24 : pltcl_construct_errorCode(interp, edata);
2302 24 : UTF_BEGIN;
2303 24 : Tcl_SetObjResult(interp, Tcl_NewStringObj(UTF_E2U(edata->message), -1));
2304 24 : UTF_END;
2305 24 : FreeErrorData(edata);
2306 24 : }
2307 :
2308 :
2309 : /**********************************************************************
2310 : * pltcl_SPI_execute() - The builtin SPI_execute command
2311 : * for the Tcl interpreter
2312 : **********************************************************************/
2313 : static int
2314 126 : pltcl_SPI_execute(ClientData cdata, Tcl_Interp *interp,
2315 : int objc, Tcl_Obj *const objv[])
2316 : {
2317 : int my_rc;
2318 : int spi_rc;
2319 : int query_idx;
2320 : int i;
2321 : int optIndex;
2322 126 : int count = 0;
2323 126 : const char *volatile arrayname = NULL;
2324 126 : Tcl_Obj *volatile loop_body = NULL;
2325 126 : MemoryContext oldcontext = CurrentMemoryContext;
2326 126 : ResourceOwner oldowner = CurrentResourceOwner;
2327 :
2328 : enum options
2329 : {
2330 : OPT_ARRAY, OPT_COUNT
2331 : };
2332 :
2333 : static const char *options[] = {
2334 : "-array", "-count", (const char *) NULL
2335 : };
2336 :
2337 : /************************************************************
2338 : * Check the call syntax and get the options
2339 : ************************************************************/
2340 126 : if (objc < 2)
2341 : {
2342 2 : Tcl_WrongNumArgs(interp, 1, objv,
2343 : "?-count n? ?-array name? query ?loop body?");
2344 2 : return TCL_ERROR;
2345 : }
2346 :
2347 124 : i = 1;
2348 124 : while (i < objc)
2349 : {
2350 140 : if (Tcl_GetIndexFromObj(NULL, objv[i], options, NULL,
2351 : TCL_EXACT, &optIndex) != TCL_OK)
2352 118 : break;
2353 :
2354 22 : if (++i >= objc)
2355 : {
2356 4 : Tcl_SetObjResult(interp,
2357 : Tcl_NewStringObj("missing argument to -count or -array", -1));
2358 4 : return TCL_ERROR;
2359 : }
2360 :
2361 18 : switch ((enum options) optIndex)
2362 : {
2363 16 : case OPT_ARRAY:
2364 16 : arrayname = Tcl_GetString(objv[i++]);
2365 16 : break;
2366 :
2367 2 : case OPT_COUNT:
2368 2 : if (Tcl_GetIntFromObj(interp, objv[i++], &count) != TCL_OK)
2369 2 : return TCL_ERROR;
2370 0 : break;
2371 : }
2372 140 : }
2373 :
2374 118 : query_idx = i;
2375 118 : if (query_idx >= objc || query_idx + 2 < objc)
2376 : {
2377 2 : Tcl_WrongNumArgs(interp, query_idx - 1, objv, "query ?loop body?");
2378 2 : return TCL_ERROR;
2379 : }
2380 :
2381 116 : if (query_idx + 1 < objc)
2382 16 : loop_body = objv[query_idx + 1];
2383 :
2384 : /************************************************************
2385 : * Execute the query inside a sub-transaction, so we can cope with
2386 : * errors sanely
2387 : ************************************************************/
2388 :
2389 116 : pltcl_subtrans_begin(oldcontext, oldowner);
2390 :
2391 116 : PG_TRY();
2392 : {
2393 116 : UTF_BEGIN;
2394 116 : spi_rc = SPI_execute(UTF_U2E(Tcl_GetString(objv[query_idx])),
2395 116 : pltcl_current_call_state->prodesc->fn_readonly, count);
2396 100 : UTF_END;
2397 :
2398 100 : my_rc = pltcl_process_SPI_result(interp,
2399 : arrayname,
2400 : loop_body,
2401 : spi_rc,
2402 : SPI_tuptable,
2403 : SPI_processed);
2404 :
2405 100 : pltcl_subtrans_commit(oldcontext, oldowner);
2406 : }
2407 16 : PG_CATCH();
2408 : {
2409 16 : pltcl_subtrans_abort(interp, oldcontext, oldowner);
2410 16 : return TCL_ERROR;
2411 : }
2412 100 : PG_END_TRY();
2413 :
2414 100 : return my_rc;
2415 : }
2416 :
2417 : /*
2418 : * Process the result from SPI_execute or SPI_execute_plan
2419 : *
2420 : * Shared code between pltcl_SPI_execute and pltcl_SPI_execute_plan
2421 : */
2422 : static int
2423 198 : pltcl_process_SPI_result(Tcl_Interp *interp,
2424 : const char *arrayname,
2425 : Tcl_Obj *loop_body,
2426 : int spi_rc,
2427 : SPITupleTable *tuptable,
2428 : uint64 ntuples)
2429 : {
2430 198 : int my_rc = TCL_OK;
2431 : int loop_rc;
2432 : HeapTuple *tuples;
2433 : TupleDesc tupdesc;
2434 :
2435 198 : switch (spi_rc)
2436 : {
2437 74 : case SPI_OK_SELINTO:
2438 : case SPI_OK_INSERT:
2439 : case SPI_OK_DELETE:
2440 : case SPI_OK_UPDATE:
2441 : case SPI_OK_MERGE:
2442 74 : Tcl_SetObjResult(interp, Tcl_NewWideIntObj(ntuples));
2443 74 : break;
2444 :
2445 0 : case SPI_OK_UTILITY:
2446 : case SPI_OK_REWRITTEN:
2447 0 : if (tuptable == NULL)
2448 : {
2449 0 : Tcl_SetObjResult(interp, Tcl_NewIntObj(0));
2450 0 : break;
2451 : }
2452 : /* fall through for utility returning tuples */
2453 : /* FALLTHROUGH */
2454 :
2455 : case SPI_OK_SELECT:
2456 : case SPI_OK_INSERT_RETURNING:
2457 : case SPI_OK_DELETE_RETURNING:
2458 : case SPI_OK_UPDATE_RETURNING:
2459 : case SPI_OK_MERGE_RETURNING:
2460 :
2461 : /*
2462 : * Process the tuples we got
2463 : */
2464 122 : tuples = tuptable->vals;
2465 122 : tupdesc = tuptable->tupdesc;
2466 :
2467 122 : if (loop_body == NULL)
2468 : {
2469 : /*
2470 : * If there is no loop body given, just set the variables from
2471 : * the first tuple (if any)
2472 : */
2473 98 : if (ntuples > 0)
2474 56 : pltcl_set_tuple_values(interp, arrayname, 0,
2475 : tuples[0], tupdesc);
2476 : }
2477 : else
2478 : {
2479 : /*
2480 : * There is a loop body - process all tuples and evaluate the
2481 : * body on each
2482 : */
2483 : uint64 i;
2484 :
2485 52 : for (i = 0; i < ntuples; i++)
2486 : {
2487 44 : pltcl_set_tuple_values(interp, arrayname, i,
2488 44 : tuples[i], tupdesc);
2489 :
2490 44 : loop_rc = Tcl_EvalObjEx(interp, loop_body, 0);
2491 :
2492 44 : if (loop_rc == TCL_OK)
2493 24 : continue;
2494 20 : if (loop_rc == TCL_CONTINUE)
2495 4 : continue;
2496 16 : if (loop_rc == TCL_RETURN)
2497 : {
2498 4 : my_rc = TCL_RETURN;
2499 4 : break;
2500 : }
2501 12 : if (loop_rc == TCL_BREAK)
2502 4 : break;
2503 8 : my_rc = TCL_ERROR;
2504 8 : break;
2505 : }
2506 : }
2507 :
2508 122 : if (my_rc == TCL_OK)
2509 : {
2510 110 : Tcl_SetObjResult(interp, Tcl_NewWideIntObj(ntuples));
2511 : }
2512 122 : break;
2513 :
2514 2 : default:
2515 2 : Tcl_AppendResult(interp, "pltcl: SPI_execute failed: ",
2516 : SPI_result_code_string(spi_rc), NULL);
2517 2 : my_rc = TCL_ERROR;
2518 2 : break;
2519 : }
2520 :
2521 198 : SPI_freetuptable(tuptable);
2522 :
2523 198 : return my_rc;
2524 : }
2525 :
2526 :
2527 : /**********************************************************************
2528 : * pltcl_SPI_prepare() - Builtin support for prepared plans
2529 : * The Tcl command SPI_prepare
2530 : * always saves the plan using
2531 : * SPI_keepplan and returns a key for
2532 : * access. There is no chance to prepare
2533 : * and not save the plan currently.
2534 : **********************************************************************/
2535 : static int
2536 34 : pltcl_SPI_prepare(ClientData cdata, Tcl_Interp *interp,
2537 : int objc, Tcl_Obj *const objv[])
2538 : {
2539 34 : volatile MemoryContext plan_cxt = NULL;
2540 : int nargs;
2541 : Tcl_Obj **argsObj;
2542 : pltcl_query_desc *qdesc;
2543 : int i;
2544 : Tcl_HashEntry *hashent;
2545 : int hashnew;
2546 : Tcl_HashTable *query_hash;
2547 34 : MemoryContext oldcontext = CurrentMemoryContext;
2548 34 : ResourceOwner oldowner = CurrentResourceOwner;
2549 :
2550 : /************************************************************
2551 : * Check the call syntax
2552 : ************************************************************/
2553 34 : if (objc != 3)
2554 : {
2555 2 : Tcl_WrongNumArgs(interp, 1, objv, "query argtypes");
2556 2 : return TCL_ERROR;
2557 : }
2558 :
2559 : /************************************************************
2560 : * Split the argument type list
2561 : ************************************************************/
2562 32 : if (Tcl_ListObjGetElements(interp, objv[2], &nargs, &argsObj) != TCL_OK)
2563 2 : return TCL_ERROR;
2564 :
2565 : /************************************************************
2566 : * Allocate the new querydesc structure
2567 : *
2568 : * struct qdesc and subsidiary data all live in plan_cxt. Note that if the
2569 : * function is recompiled for whatever reason, permanent memory leaks
2570 : * occur. FIXME someday.
2571 : ************************************************************/
2572 30 : plan_cxt = AllocSetContextCreate(TopMemoryContext,
2573 : "PL/Tcl spi_prepare query",
2574 : ALLOCSET_SMALL_SIZES);
2575 30 : MemoryContextSwitchTo(plan_cxt);
2576 30 : qdesc = (pltcl_query_desc *) palloc0(sizeof(pltcl_query_desc));
2577 30 : snprintf(qdesc->qname, sizeof(qdesc->qname), "%p", qdesc);
2578 30 : qdesc->nargs = nargs;
2579 30 : qdesc->argtypes = (Oid *) palloc(nargs * sizeof(Oid));
2580 30 : qdesc->arginfuncs = (FmgrInfo *) palloc(nargs * sizeof(FmgrInfo));
2581 30 : qdesc->argtypioparams = (Oid *) palloc(nargs * sizeof(Oid));
2582 30 : MemoryContextSwitchTo(oldcontext);
2583 :
2584 : /************************************************************
2585 : * Execute the prepare inside a sub-transaction, so we can cope with
2586 : * errors sanely
2587 : ************************************************************/
2588 :
2589 30 : pltcl_subtrans_begin(oldcontext, oldowner);
2590 :
2591 30 : PG_TRY();
2592 : {
2593 : /************************************************************
2594 : * Resolve argument type names and then look them up by oid
2595 : * in the system cache, and remember the required information
2596 : * for input conversion.
2597 : ************************************************************/
2598 68 : for (i = 0; i < nargs; i++)
2599 : {
2600 : Oid typId,
2601 : typInput,
2602 : typIOParam;
2603 : int32 typmod;
2604 :
2605 40 : (void) parseTypeString(Tcl_GetString(argsObj[i]),
2606 : &typId, &typmod, NULL);
2607 :
2608 38 : getTypeInputInfo(typId, &typInput, &typIOParam);
2609 :
2610 38 : qdesc->argtypes[i] = typId;
2611 38 : fmgr_info_cxt(typInput, &(qdesc->arginfuncs[i]), plan_cxt);
2612 38 : qdesc->argtypioparams[i] = typIOParam;
2613 : }
2614 :
2615 : /************************************************************
2616 : * Prepare the plan and check for errors
2617 : ************************************************************/
2618 28 : UTF_BEGIN;
2619 28 : qdesc->plan = SPI_prepare(UTF_U2E(Tcl_GetString(objv[1])),
2620 : nargs, qdesc->argtypes);
2621 26 : UTF_END;
2622 :
2623 26 : if (qdesc->plan == NULL)
2624 0 : elog(ERROR, "SPI_prepare() failed");
2625 :
2626 : /************************************************************
2627 : * Save the plan into permanent memory (right now it's in the
2628 : * SPI procCxt, which will go away at function end).
2629 : ************************************************************/
2630 26 : if (SPI_keepplan(qdesc->plan))
2631 0 : elog(ERROR, "SPI_keepplan() failed");
2632 :
2633 26 : pltcl_subtrans_commit(oldcontext, oldowner);
2634 : }
2635 4 : PG_CATCH();
2636 : {
2637 4 : pltcl_subtrans_abort(interp, oldcontext, oldowner);
2638 :
2639 4 : MemoryContextDelete(plan_cxt);
2640 :
2641 4 : return TCL_ERROR;
2642 : }
2643 26 : PG_END_TRY();
2644 :
2645 : /************************************************************
2646 : * Insert a hashtable entry for the plan and return
2647 : * the key to the caller
2648 : ************************************************************/
2649 26 : query_hash = &pltcl_current_call_state->prodesc->interp_desc->query_hash;
2650 :
2651 26 : hashent = Tcl_CreateHashEntry(query_hash, qdesc->qname, &hashnew);
2652 26 : Tcl_SetHashValue(hashent, (ClientData) qdesc);
2653 :
2654 : /* qname is ASCII, so no need for encoding conversion */
2655 26 : Tcl_SetObjResult(interp, Tcl_NewStringObj(qdesc->qname, -1));
2656 26 : return TCL_OK;
2657 : }
2658 :
2659 :
2660 : /**********************************************************************
2661 : * pltcl_SPI_execute_plan() - Execute a prepared plan
2662 : **********************************************************************/
2663 : static int
2664 110 : pltcl_SPI_execute_plan(ClientData cdata, Tcl_Interp *interp,
2665 : int objc, Tcl_Obj *const objv[])
2666 : {
2667 : int my_rc;
2668 : int spi_rc;
2669 : int i;
2670 : int j;
2671 : int optIndex;
2672 : Tcl_HashEntry *hashent;
2673 : pltcl_query_desc *qdesc;
2674 110 : const char *nulls = NULL;
2675 110 : const char *arrayname = NULL;
2676 110 : Tcl_Obj *loop_body = NULL;
2677 110 : int count = 0;
2678 : int callObjc;
2679 110 : Tcl_Obj **callObjv = NULL;
2680 : Datum *argvalues;
2681 110 : MemoryContext oldcontext = CurrentMemoryContext;
2682 110 : ResourceOwner oldowner = CurrentResourceOwner;
2683 : Tcl_HashTable *query_hash;
2684 :
2685 : enum options
2686 : {
2687 : OPT_ARRAY, OPT_COUNT, OPT_NULLS
2688 : };
2689 :
2690 : static const char *options[] = {
2691 : "-array", "-count", "-nulls", (const char *) NULL
2692 : };
2693 :
2694 : /************************************************************
2695 : * Get the options and check syntax
2696 : ************************************************************/
2697 110 : i = 1;
2698 110 : while (i < objc)
2699 : {
2700 196 : if (Tcl_GetIndexFromObj(NULL, objv[i], options, NULL,
2701 : TCL_EXACT, &optIndex) != TCL_OK)
2702 100 : break;
2703 :
2704 96 : if (++i >= objc)
2705 : {
2706 6 : Tcl_SetObjResult(interp,
2707 : Tcl_NewStringObj("missing argument to -array, -count or -nulls", -1));
2708 6 : return TCL_ERROR;
2709 : }
2710 :
2711 90 : switch ((enum options) optIndex)
2712 : {
2713 8 : case OPT_ARRAY:
2714 8 : arrayname = Tcl_GetString(objv[i++]);
2715 8 : break;
2716 :
2717 82 : case OPT_COUNT:
2718 82 : if (Tcl_GetIntFromObj(interp, objv[i++], &count) != TCL_OK)
2719 2 : return TCL_ERROR;
2720 80 : break;
2721 :
2722 0 : case OPT_NULLS:
2723 0 : nulls = Tcl_GetString(objv[i++]);
2724 0 : break;
2725 : }
2726 198 : }
2727 :
2728 : /************************************************************
2729 : * Get the prepared plan descriptor by its key
2730 : ************************************************************/
2731 102 : if (i >= objc)
2732 : {
2733 2 : Tcl_SetObjResult(interp,
2734 : Tcl_NewStringObj("missing argument to -count or -array", -1));
2735 2 : return TCL_ERROR;
2736 : }
2737 :
2738 100 : query_hash = &pltcl_current_call_state->prodesc->interp_desc->query_hash;
2739 :
2740 100 : hashent = Tcl_FindHashEntry(query_hash, Tcl_GetString(objv[i]));
2741 100 : if (hashent == NULL)
2742 : {
2743 2 : Tcl_AppendResult(interp, "invalid queryid '", Tcl_GetString(objv[i]), "'", NULL);
2744 2 : return TCL_ERROR;
2745 : }
2746 98 : qdesc = (pltcl_query_desc *) Tcl_GetHashValue(hashent);
2747 98 : i++;
2748 :
2749 : /************************************************************
2750 : * If a nulls string is given, check for correct length
2751 : ************************************************************/
2752 98 : if (nulls != NULL)
2753 : {
2754 0 : if (strlen(nulls) != qdesc->nargs)
2755 : {
2756 0 : Tcl_SetObjResult(interp,
2757 : Tcl_NewStringObj("length of nulls string doesn't match number of arguments",
2758 : -1));
2759 0 : return TCL_ERROR;
2760 : }
2761 : }
2762 :
2763 : /************************************************************
2764 : * If there was an argtype list on preparation, we need
2765 : * an argument value list now
2766 : ************************************************************/
2767 98 : if (qdesc->nargs > 0)
2768 : {
2769 90 : if (i >= objc)
2770 : {
2771 0 : Tcl_SetObjResult(interp,
2772 : Tcl_NewStringObj("argument list length doesn't match number of arguments for query",
2773 : -1));
2774 0 : return TCL_ERROR;
2775 : }
2776 :
2777 : /************************************************************
2778 : * Split the argument values
2779 : ************************************************************/
2780 90 : if (Tcl_ListObjGetElements(interp, objv[i++], &callObjc, &callObjv) != TCL_OK)
2781 0 : return TCL_ERROR;
2782 :
2783 : /************************************************************
2784 : * Check that the number of arguments matches
2785 : ************************************************************/
2786 90 : if (callObjc != qdesc->nargs)
2787 : {
2788 0 : Tcl_SetObjResult(interp,
2789 : Tcl_NewStringObj("argument list length doesn't match number of arguments for query",
2790 : -1));
2791 0 : return TCL_ERROR;
2792 : }
2793 : }
2794 : else
2795 8 : callObjc = 0;
2796 :
2797 : /************************************************************
2798 : * Get loop body if present
2799 : ************************************************************/
2800 98 : if (i < objc)
2801 8 : loop_body = objv[i++];
2802 :
2803 98 : if (i != objc)
2804 : {
2805 0 : Tcl_WrongNumArgs(interp, 1, objv,
2806 : "?-count n? ?-array name? ?-nulls string? "
2807 : "query ?args? ?loop body?");
2808 0 : return TCL_ERROR;
2809 : }
2810 :
2811 : /************************************************************
2812 : * Execute the plan inside a sub-transaction, so we can cope with
2813 : * errors sanely
2814 : ************************************************************/
2815 :
2816 98 : pltcl_subtrans_begin(oldcontext, oldowner);
2817 :
2818 98 : PG_TRY();
2819 : {
2820 : /************************************************************
2821 : * Setup the value array for SPI_execute_plan() using
2822 : * the type specific input functions
2823 : ************************************************************/
2824 98 : argvalues = (Datum *) palloc(callObjc * sizeof(Datum));
2825 :
2826 284 : for (j = 0; j < callObjc; j++)
2827 : {
2828 186 : if (nulls && nulls[j] == 'n')
2829 : {
2830 0 : argvalues[j] = InputFunctionCall(&qdesc->arginfuncs[j],
2831 : NULL,
2832 0 : qdesc->argtypioparams[j],
2833 : -1);
2834 : }
2835 : else
2836 : {
2837 186 : UTF_BEGIN;
2838 558 : argvalues[j] = InputFunctionCall(&qdesc->arginfuncs[j],
2839 186 : UTF_U2E(Tcl_GetString(callObjv[j])),
2840 186 : qdesc->argtypioparams[j],
2841 : -1);
2842 186 : UTF_END;
2843 : }
2844 : }
2845 :
2846 : /************************************************************
2847 : * Execute the plan
2848 : ************************************************************/
2849 196 : spi_rc = SPI_execute_plan(qdesc->plan, argvalues, nulls,
2850 98 : pltcl_current_call_state->prodesc->fn_readonly,
2851 : count);
2852 :
2853 98 : my_rc = pltcl_process_SPI_result(interp,
2854 : arrayname,
2855 : loop_body,
2856 : spi_rc,
2857 : SPI_tuptable,
2858 : SPI_processed);
2859 :
2860 98 : pltcl_subtrans_commit(oldcontext, oldowner);
2861 : }
2862 0 : PG_CATCH();
2863 : {
2864 0 : pltcl_subtrans_abort(interp, oldcontext, oldowner);
2865 0 : return TCL_ERROR;
2866 : }
2867 98 : PG_END_TRY();
2868 :
2869 98 : return my_rc;
2870 : }
2871 :
2872 :
2873 : /**********************************************************************
2874 : * pltcl_subtransaction() - Execute some Tcl code in a subtransaction
2875 : *
2876 : * The subtransaction is aborted if the Tcl code fragment returns TCL_ERROR,
2877 : * otherwise it's subcommitted.
2878 : **********************************************************************/
2879 : static int
2880 16 : pltcl_subtransaction(ClientData cdata, Tcl_Interp *interp,
2881 : int objc, Tcl_Obj *const objv[])
2882 : {
2883 16 : MemoryContext oldcontext = CurrentMemoryContext;
2884 16 : ResourceOwner oldowner = CurrentResourceOwner;
2885 : int retcode;
2886 :
2887 16 : if (objc != 2)
2888 : {
2889 0 : Tcl_WrongNumArgs(interp, 1, objv, "command");
2890 0 : return TCL_ERROR;
2891 : }
2892 :
2893 : /*
2894 : * Note: we don't use pltcl_subtrans_begin and friends here because we
2895 : * don't want the error handling in pltcl_subtrans_abort. But otherwise
2896 : * the processing should be about the same as in those functions.
2897 : */
2898 16 : BeginInternalSubTransaction(NULL);
2899 16 : MemoryContextSwitchTo(oldcontext);
2900 :
2901 16 : retcode = Tcl_EvalObjEx(interp, objv[1], 0);
2902 :
2903 16 : if (retcode == TCL_ERROR)
2904 : {
2905 : /* Rollback the subtransaction */
2906 10 : RollbackAndReleaseCurrentSubTransaction();
2907 : }
2908 : else
2909 : {
2910 : /* Commit the subtransaction */
2911 6 : ReleaseCurrentSubTransaction();
2912 : }
2913 :
2914 : /* In either case, restore previous memory context and resource owner */
2915 16 : MemoryContextSwitchTo(oldcontext);
2916 16 : CurrentResourceOwner = oldowner;
2917 :
2918 16 : return retcode;
2919 : }
2920 :
2921 :
2922 : /**********************************************************************
2923 : * pltcl_commit()
2924 : *
2925 : * Commit the transaction and start a new one.
2926 : **********************************************************************/
2927 : static int
2928 20 : pltcl_commit(ClientData cdata, Tcl_Interp *interp,
2929 : int objc, Tcl_Obj *const objv[])
2930 : {
2931 20 : MemoryContext oldcontext = CurrentMemoryContext;
2932 :
2933 20 : PG_TRY();
2934 : {
2935 20 : SPI_commit();
2936 : }
2937 10 : PG_CATCH();
2938 : {
2939 : ErrorData *edata;
2940 :
2941 : /* Save error info */
2942 10 : MemoryContextSwitchTo(oldcontext);
2943 10 : edata = CopyErrorData();
2944 10 : FlushErrorState();
2945 :
2946 : /* Pass the error data to Tcl */
2947 10 : pltcl_construct_errorCode(interp, edata);
2948 10 : UTF_BEGIN;
2949 10 : Tcl_SetObjResult(interp, Tcl_NewStringObj(UTF_E2U(edata->message), -1));
2950 10 : UTF_END;
2951 10 : FreeErrorData(edata);
2952 :
2953 10 : return TCL_ERROR;
2954 : }
2955 10 : PG_END_TRY();
2956 :
2957 10 : return TCL_OK;
2958 : }
2959 :
2960 :
2961 : /**********************************************************************
2962 : * pltcl_rollback()
2963 : *
2964 : * Abort the transaction and start a new one.
2965 : **********************************************************************/
2966 : static int
2967 12 : pltcl_rollback(ClientData cdata, Tcl_Interp *interp,
2968 : int objc, Tcl_Obj *const objv[])
2969 : {
2970 12 : MemoryContext oldcontext = CurrentMemoryContext;
2971 :
2972 12 : PG_TRY();
2973 : {
2974 12 : SPI_rollback();
2975 : }
2976 2 : PG_CATCH();
2977 : {
2978 : ErrorData *edata;
2979 :
2980 : /* Save error info */
2981 2 : MemoryContextSwitchTo(oldcontext);
2982 2 : edata = CopyErrorData();
2983 2 : FlushErrorState();
2984 :
2985 : /* Pass the error data to Tcl */
2986 2 : pltcl_construct_errorCode(interp, edata);
2987 2 : UTF_BEGIN;
2988 2 : Tcl_SetObjResult(interp, Tcl_NewStringObj(UTF_E2U(edata->message), -1));
2989 2 : UTF_END;
2990 2 : FreeErrorData(edata);
2991 :
2992 2 : return TCL_ERROR;
2993 : }
2994 10 : PG_END_TRY();
2995 :
2996 10 : return TCL_OK;
2997 : }
2998 :
2999 :
3000 : /**********************************************************************
3001 : * pltcl_set_tuple_values() - Set variables for all attributes
3002 : * of a given tuple
3003 : *
3004 : * Note: arrayname is presumed to be UTF8; it usually came from Tcl
3005 : **********************************************************************/
3006 : static void
3007 100 : pltcl_set_tuple_values(Tcl_Interp *interp, const char *arrayname,
3008 : uint64 tupno, HeapTuple tuple, TupleDesc tupdesc)
3009 : {
3010 : int i;
3011 : char *outputstr;
3012 : Datum attr;
3013 : bool isnull;
3014 : const char *attname;
3015 : Oid typoutput;
3016 : bool typisvarlena;
3017 : const char **arrptr;
3018 : const char **nameptr;
3019 100 : const char *nullname = NULL;
3020 :
3021 : /************************************************************
3022 : * Prepare pointers for Tcl_SetVar2Ex() below
3023 : ************************************************************/
3024 100 : if (arrayname == NULL)
3025 : {
3026 56 : arrptr = &attname;
3027 56 : nameptr = &nullname;
3028 : }
3029 : else
3030 : {
3031 44 : arrptr = &arrayname;
3032 44 : nameptr = &attname;
3033 :
3034 : /*
3035 : * When outputting to an array, fill the ".tupno" element with the
3036 : * current tuple number. This will be overridden below if ".tupno" is
3037 : * in use as an actual field name in the rowtype.
3038 : */
3039 44 : Tcl_SetVar2Ex(interp, arrayname, ".tupno", Tcl_NewWideIntObj(tupno), 0);
3040 : }
3041 :
3042 240 : for (i = 0; i < tupdesc->natts; i++)
3043 : {
3044 140 : Form_pg_attribute att = TupleDescAttr(tupdesc, i);
3045 :
3046 : /* ignore dropped attributes */
3047 140 : if (att->attisdropped)
3048 0 : continue;
3049 :
3050 : /************************************************************
3051 : * Get the attribute name
3052 : ************************************************************/
3053 140 : UTF_BEGIN;
3054 140 : attname = pstrdup(UTF_E2U(NameStr(att->attname)));
3055 140 : UTF_END;
3056 :
3057 : /************************************************************
3058 : * Get the attributes value
3059 : ************************************************************/
3060 140 : attr = heap_getattr(tuple, i + 1, tupdesc, &isnull);
3061 :
3062 : /************************************************************
3063 : * If there is a value, set the variable
3064 : * If not, unset it
3065 : *
3066 : * Hmmm - Null attributes will cause functions to
3067 : * crash if they don't expect them - need something
3068 : * smarter here.
3069 : ************************************************************/
3070 140 : if (!isnull)
3071 : {
3072 140 : getTypeOutputInfo(att->atttypid, &typoutput, &typisvarlena);
3073 140 : outputstr = OidOutputFunctionCall(typoutput, attr);
3074 140 : UTF_BEGIN;
3075 140 : Tcl_SetVar2Ex(interp, *arrptr, *nameptr,
3076 140 : Tcl_NewStringObj(UTF_E2U(outputstr), -1), 0);
3077 140 : UTF_END;
3078 140 : pfree(outputstr);
3079 : }
3080 : else
3081 0 : Tcl_UnsetVar2(interp, *arrptr, *nameptr, 0);
3082 :
3083 140 : pfree(unconstify(char *, attname));
3084 : }
3085 100 : }
3086 :
3087 :
3088 : /**********************************************************************
3089 : * pltcl_build_tuple_argument() - Build a list object usable for 'array set'
3090 : * from all attributes of a given tuple
3091 : **********************************************************************/
3092 : static Tcl_Obj *
3093 138 : pltcl_build_tuple_argument(HeapTuple tuple, TupleDesc tupdesc, bool include_generated)
3094 : {
3095 138 : Tcl_Obj *retobj = Tcl_NewObj();
3096 : int i;
3097 : char *outputstr;
3098 : Datum attr;
3099 : bool isnull;
3100 : char *attname;
3101 : Oid typoutput;
3102 : bool typisvarlena;
3103 :
3104 568 : for (i = 0; i < tupdesc->natts; i++)
3105 : {
3106 430 : Form_pg_attribute att = TupleDescAttr(tupdesc, i);
3107 :
3108 : /* ignore dropped attributes */
3109 430 : if (att->attisdropped)
3110 16 : continue;
3111 :
3112 414 : if (att->attgenerated)
3113 : {
3114 : /* don't include unless requested */
3115 18 : if (!include_generated)
3116 6 : continue;
3117 : }
3118 :
3119 : /************************************************************
3120 : * Get the attribute name
3121 : ************************************************************/
3122 408 : attname = NameStr(att->attname);
3123 :
3124 : /************************************************************
3125 : * Get the attributes value
3126 : ************************************************************/
3127 408 : attr = heap_getattr(tuple, i + 1, tupdesc, &isnull);
3128 :
3129 : /************************************************************
3130 : * If there is a value, append the attribute name and the
3131 : * value to the list
3132 : *
3133 : * Hmmm - Null attributes will cause functions to
3134 : * crash if they don't expect them - need something
3135 : * smarter here.
3136 : ************************************************************/
3137 408 : if (!isnull)
3138 : {
3139 400 : getTypeOutputInfo(att->atttypid,
3140 : &typoutput, &typisvarlena);
3141 400 : outputstr = OidOutputFunctionCall(typoutput, attr);
3142 400 : UTF_BEGIN;
3143 400 : Tcl_ListObjAppendElement(NULL, retobj,
3144 400 : Tcl_NewStringObj(UTF_E2U(attname), -1));
3145 400 : UTF_END;
3146 400 : UTF_BEGIN;
3147 400 : Tcl_ListObjAppendElement(NULL, retobj,
3148 400 : Tcl_NewStringObj(UTF_E2U(outputstr), -1));
3149 400 : UTF_END;
3150 400 : pfree(outputstr);
3151 : }
3152 : }
3153 :
3154 138 : return retobj;
3155 : }
3156 :
3157 : /**********************************************************************
3158 : * pltcl_build_tuple_result() - Build a tuple of function's result rowtype
3159 : * from a Tcl list of column names and values
3160 : *
3161 : * In a trigger function, we build a tuple of the trigger table's rowtype.
3162 : *
3163 : * Note: this function leaks memory. Even if we made it clean up its own
3164 : * mess, there's no way to prevent the datatype input functions it calls
3165 : * from leaking. Run it in a short-lived context, unless we're about to
3166 : * exit the procedure anyway.
3167 : **********************************************************************/
3168 : static HeapTuple
3169 62 : pltcl_build_tuple_result(Tcl_Interp *interp, Tcl_Obj **kvObjv, int kvObjc,
3170 : pltcl_call_state *call_state)
3171 : {
3172 : HeapTuple tuple;
3173 : TupleDesc tupdesc;
3174 : AttInMetadata *attinmeta;
3175 : char **values;
3176 : int i;
3177 :
3178 62 : if (call_state->ret_tupdesc)
3179 : {
3180 42 : tupdesc = call_state->ret_tupdesc;
3181 42 : attinmeta = call_state->attinmeta;
3182 : }
3183 20 : else if (call_state->trigdata)
3184 : {
3185 20 : tupdesc = RelationGetDescr(call_state->trigdata->tg_relation);
3186 20 : attinmeta = TupleDescGetAttInMetadata(tupdesc);
3187 : }
3188 : else
3189 : {
3190 0 : elog(ERROR, "PL/Tcl function does not return a tuple");
3191 : tupdesc = NULL; /* keep compiler quiet */
3192 : attinmeta = NULL;
3193 : }
3194 :
3195 62 : values = (char **) palloc0(tupdesc->natts * sizeof(char *));
3196 :
3197 62 : if (kvObjc % 2 != 0)
3198 4 : ereport(ERROR,
3199 : (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
3200 : errmsg("column name/value list must have even number of elements")));
3201 :
3202 196 : for (i = 0; i < kvObjc; i += 2)
3203 : {
3204 146 : char *fieldName = utf_u2e(Tcl_GetString(kvObjv[i]));
3205 146 : int attn = SPI_fnumber(tupdesc, fieldName);
3206 :
3207 : /*
3208 : * We silently ignore ".tupno", if it's present but doesn't match any
3209 : * actual output column. This allows direct use of a row returned by
3210 : * pltcl_set_tuple_values().
3211 : */
3212 146 : if (attn == SPI_ERROR_NOATTRIBUTE)
3213 : {
3214 6 : if (strcmp(fieldName, ".tupno") == 0)
3215 0 : continue;
3216 6 : ereport(ERROR,
3217 : (errcode(ERRCODE_UNDEFINED_COLUMN),
3218 : errmsg("column name/value list contains nonexistent column name \"%s\"",
3219 : fieldName)));
3220 : }
3221 :
3222 140 : if (attn <= 0)
3223 0 : ereport(ERROR,
3224 : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
3225 : errmsg("cannot set system attribute \"%s\"",
3226 : fieldName)));
3227 :
3228 140 : if (TupleDescAttr(tupdesc, attn - 1)->attgenerated)
3229 2 : ereport(ERROR,
3230 : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
3231 : errmsg("cannot set generated column \"%s\"",
3232 : fieldName)));
3233 :
3234 138 : values[attn - 1] = utf_u2e(Tcl_GetString(kvObjv[i + 1]));
3235 : }
3236 :
3237 50 : tuple = BuildTupleFromCStrings(attinmeta, values);
3238 :
3239 : /* if result type is domain-over-composite, check domain constraints */
3240 50 : if (call_state->prodesc->fn_retisdomain)
3241 6 : domain_check(HeapTupleGetDatum(tuple), false,
3242 6 : call_state->prodesc->result_typid,
3243 6 : &call_state->prodesc->domain_info,
3244 6 : call_state->prodesc->fn_cxt);
3245 :
3246 48 : return tuple;
3247 : }
3248 :
3249 : /**********************************************************************
3250 : * pltcl_init_tuple_store() - Initialize the result tuplestore for a SRF
3251 : **********************************************************************/
3252 : static void
3253 10 : pltcl_init_tuple_store(pltcl_call_state *call_state)
3254 : {
3255 10 : ReturnSetInfo *rsi = call_state->rsi;
3256 : MemoryContext oldcxt;
3257 : ResourceOwner oldowner;
3258 :
3259 : /* Should be in a SRF */
3260 : Assert(rsi);
3261 : /* Should be first time through */
3262 : Assert(!call_state->tuple_store);
3263 : Assert(!call_state->attinmeta);
3264 :
3265 : /* We expect caller to provide an appropriate result tupdesc */
3266 : Assert(rsi->expectedDesc);
3267 10 : call_state->ret_tupdesc = rsi->expectedDesc;
3268 :
3269 : /*
3270 : * Switch to the right memory context and resource owner for storing the
3271 : * tuplestore. If we're within a subtransaction opened for an exception
3272 : * block, for example, we must still create the tuplestore in the resource
3273 : * owner that was active when this function was entered, and not in the
3274 : * subtransaction's resource owner.
3275 : */
3276 10 : oldcxt = MemoryContextSwitchTo(call_state->tuple_store_cxt);
3277 10 : oldowner = CurrentResourceOwner;
3278 10 : CurrentResourceOwner = call_state->tuple_store_owner;
3279 :
3280 10 : call_state->tuple_store =
3281 10 : tuplestore_begin_heap(rsi->allowedModes & SFRM_Materialize_Random,
3282 : false, work_mem);
3283 :
3284 : /* Build attinmeta in this context, too */
3285 10 : call_state->attinmeta = TupleDescGetAttInMetadata(call_state->ret_tupdesc);
3286 :
3287 10 : CurrentResourceOwner = oldowner;
3288 10 : MemoryContextSwitchTo(oldcxt);
3289 10 : }
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