Line data Source code
1 : #include "postgres.h"
2 :
3 : #include "fmgr.h"
4 : #include "hstore/hstore.h"
5 : #include "plpy_typeio.h"
6 : #include "plpython.h"
7 :
8 2 : PG_MODULE_MAGIC;
9 :
10 : /* Linkage to functions in plpython module */
11 : typedef char *(*PLyObject_AsString_t) (PyObject *plrv);
12 : static PLyObject_AsString_t PLyObject_AsString_p;
13 : typedef PyObject *(*PLyUnicode_FromStringAndSize_t) (const char *s, Py_ssize_t size);
14 : static PLyUnicode_FromStringAndSize_t PLyUnicode_FromStringAndSize_p;
15 :
16 : /* Linkage to functions in hstore module */
17 : typedef HStore *(*hstoreUpgrade_t) (Datum orig);
18 : static hstoreUpgrade_t hstoreUpgrade_p;
19 : typedef int (*hstoreUniquePairs_t) (Pairs *a, int32 l, int32 *buflen);
20 : static hstoreUniquePairs_t hstoreUniquePairs_p;
21 : typedef HStore *(*hstorePairs_t) (Pairs *pairs, int32 pcount, int32 buflen);
22 : static hstorePairs_t hstorePairs_p;
23 : typedef size_t (*hstoreCheckKeyLen_t) (size_t len);
24 : static hstoreCheckKeyLen_t hstoreCheckKeyLen_p;
25 : typedef size_t (*hstoreCheckValLen_t) (size_t len);
26 : static hstoreCheckValLen_t hstoreCheckValLen_p;
27 :
28 :
29 : /*
30 : * Module initialize function: fetch function pointers for cross-module calls.
31 : */
32 : void
33 2 : _PG_init(void)
34 : {
35 : /* Asserts verify that typedefs above match original declarations */
36 : AssertVariableIsOfType(&PLyObject_AsString, PLyObject_AsString_t);
37 2 : PLyObject_AsString_p = (PLyObject_AsString_t)
38 2 : load_external_function("$libdir/" PLPYTHON_LIBNAME, "PLyObject_AsString",
39 : true, NULL);
40 : AssertVariableIsOfType(&PLyUnicode_FromStringAndSize, PLyUnicode_FromStringAndSize_t);
41 2 : PLyUnicode_FromStringAndSize_p = (PLyUnicode_FromStringAndSize_t)
42 2 : load_external_function("$libdir/" PLPYTHON_LIBNAME, "PLyUnicode_FromStringAndSize",
43 : true, NULL);
44 : AssertVariableIsOfType(&hstoreUpgrade, hstoreUpgrade_t);
45 2 : hstoreUpgrade_p = (hstoreUpgrade_t)
46 2 : load_external_function("$libdir/hstore", "hstoreUpgrade",
47 : true, NULL);
48 : AssertVariableIsOfType(&hstoreUniquePairs, hstoreUniquePairs_t);
49 2 : hstoreUniquePairs_p = (hstoreUniquePairs_t)
50 2 : load_external_function("$libdir/hstore", "hstoreUniquePairs",
51 : true, NULL);
52 : AssertVariableIsOfType(&hstorePairs, hstorePairs_t);
53 2 : hstorePairs_p = (hstorePairs_t)
54 2 : load_external_function("$libdir/hstore", "hstorePairs",
55 : true, NULL);
56 : AssertVariableIsOfType(&hstoreCheckKeyLen, hstoreCheckKeyLen_t);
57 2 : hstoreCheckKeyLen_p = (hstoreCheckKeyLen_t)
58 2 : load_external_function("$libdir/hstore", "hstoreCheckKeyLen",
59 : true, NULL);
60 : AssertVariableIsOfType(&hstoreCheckValLen, hstoreCheckValLen_t);
61 2 : hstoreCheckValLen_p = (hstoreCheckValLen_t)
62 2 : load_external_function("$libdir/hstore", "hstoreCheckValLen",
63 : true, NULL);
64 2 : }
65 :
66 :
67 : /* These defines must be after the module init function */
68 : #define PLyObject_AsString PLyObject_AsString_p
69 : #define PLyUnicode_FromStringAndSize PLyUnicode_FromStringAndSize_p
70 : #define hstoreUpgrade hstoreUpgrade_p
71 : #define hstoreUniquePairs hstoreUniquePairs_p
72 : #define hstorePairs hstorePairs_p
73 : #define hstoreCheckKeyLen hstoreCheckKeyLen_p
74 : #define hstoreCheckValLen hstoreCheckValLen_p
75 :
76 :
77 4 : PG_FUNCTION_INFO_V1(hstore_to_plpython);
78 :
79 : Datum
80 14 : hstore_to_plpython(PG_FUNCTION_ARGS)
81 : {
82 14 : HStore *in = PG_GETARG_HSTORE_P(0);
83 : int i;
84 14 : int count = HS_COUNT(in);
85 14 : char *base = STRPTR(in);
86 14 : HEntry *entries = ARRPTR(in);
87 : PyObject *dict;
88 :
89 14 : dict = PyDict_New();
90 14 : if (!dict)
91 0 : ereport(ERROR,
92 : (errcode(ERRCODE_OUT_OF_MEMORY),
93 : errmsg("out of memory")));
94 :
95 40 : for (i = 0; i < count; i++)
96 : {
97 : PyObject *key;
98 :
99 26 : key = PLyUnicode_FromStringAndSize(HSTORE_KEY(entries, base, i),
100 26 : HSTORE_KEYLEN(entries, i));
101 26 : if (HSTORE_VALISNULL(entries, i))
102 12 : PyDict_SetItem(dict, key, Py_None);
103 : else
104 : {
105 : PyObject *value;
106 :
107 14 : value = PLyUnicode_FromStringAndSize(HSTORE_VAL(entries, base, i),
108 14 : HSTORE_VALLEN(entries, i));
109 14 : PyDict_SetItem(dict, key, value);
110 14 : Py_XDECREF(value);
111 : }
112 26 : Py_XDECREF(key);
113 : }
114 :
115 14 : return PointerGetDatum(dict);
116 : }
117 :
118 :
119 4 : PG_FUNCTION_INFO_V1(plpython_to_hstore);
120 :
121 : Datum
122 16 : plpython_to_hstore(PG_FUNCTION_ARGS)
123 : {
124 : PyObject *dict;
125 : PyObject *volatile items;
126 : Py_ssize_t pcount;
127 : HStore *volatile out;
128 :
129 16 : dict = (PyObject *) PG_GETARG_POINTER(0);
130 :
131 : /*
132 : * As of Python 3, PyMapping_Check() is unreliable unless one first checks
133 : * that the object isn't a sequence. (Cleaner solutions exist, but not
134 : * before Python 3.10, which we're not prepared to require yet.)
135 : */
136 16 : if (PySequence_Check(dict) || !PyMapping_Check(dict))
137 2 : ereport(ERROR,
138 : (errcode(ERRCODE_WRONG_OBJECT_TYPE),
139 : errmsg("not a Python mapping")));
140 :
141 14 : pcount = PyMapping_Size(dict);
142 14 : items = PyMapping_Items(dict);
143 :
144 14 : PG_TRY();
145 : {
146 : int32 buflen;
147 : Py_ssize_t i;
148 : Pairs *pairs;
149 :
150 14 : pairs = palloc(pcount * sizeof(*pairs));
151 :
152 52 : for (i = 0; i < pcount; i++)
153 : {
154 : PyObject *tuple;
155 : PyObject *key;
156 : PyObject *value;
157 :
158 38 : tuple = PyList_GetItem(items, i);
159 38 : key = PyTuple_GetItem(tuple, 0);
160 38 : value = PyTuple_GetItem(tuple, 1);
161 :
162 38 : pairs[i].key = PLyObject_AsString(key);
163 38 : pairs[i].keylen = hstoreCheckKeyLen(strlen(pairs[i].key));
164 38 : pairs[i].needfree = true;
165 :
166 38 : if (value == Py_None)
167 : {
168 12 : pairs[i].val = NULL;
169 12 : pairs[i].vallen = 0;
170 12 : pairs[i].isnull = true;
171 : }
172 : else
173 : {
174 26 : pairs[i].val = PLyObject_AsString(value);
175 26 : pairs[i].vallen = hstoreCheckValLen(strlen(pairs[i].val));
176 26 : pairs[i].isnull = false;
177 : }
178 : }
179 :
180 14 : pcount = hstoreUniquePairs(pairs, pcount, &buflen);
181 14 : out = hstorePairs(pairs, pcount, buflen);
182 : }
183 0 : PG_FINALLY();
184 : {
185 14 : Py_DECREF(items);
186 : }
187 14 : PG_END_TRY();
188 :
189 14 : PG_RETURN_POINTER(out);
190 : }
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