Line data    Source code

       1             : /*-------------------------------------------------------------------------
       2             :  *
       3             :  * worker_internal.h
       4             :  *    Internal headers shared by logical replication workers.
       5             :  *
       6             :  * Portions Copyright (c) 2016-2019, PostgreSQL Global Development Group
       7             :  *
       8             :  * src/include/replication/worker_internal.h
       9             :  *
      10             :  *-------------------------------------------------------------------------
      11             :  */
      12             : #ifndef WORKER_INTERNAL_H
      13             : #define WORKER_INTERNAL_H
      14             : 
      15             : #include <signal.h>
      16             : 
      17             : #include "access/xlogdefs.h"
      18             : #include "catalog/pg_subscription.h"
      19             : #include "datatype/timestamp.h"
      20             : #include "storage/lock.h"
      21             : 
      22             : typedef struct LogicalRepWorker
      23             : {
      24             :     /* Time at which this worker was launched. */
      25             :     TimestampTz launch_time;
      26             : 
      27             :     /* Indicates if this slot is used or free. */
      28             :     bool        in_use;
      29             : 
      30             :     /* Increased every time the slot is taken by new worker. */
      31             :     uint16      generation;
      32             : 
      33             :     /* Pointer to proc array. NULL if not running. */
      34             :     PGPROC     *proc;
      35             : 
      36             :     /* Database id to connect to. */
      37             :     Oid         dbid;
      38             : 
      39             :     /* User to use for connection (will be same as owner of subscription). */
      40             :     Oid         userid;
      41             : 
      42             :     /* Subscription id for the worker. */
      43             :     Oid         subid;
      44             : 
      45             :     /* Used for initial table synchronization. */
      46             :     Oid         relid;
      47             :     char        relstate;
      48             :     XLogRecPtr  relstate_lsn;
      49             :     slock_t     relmutex;
      50             : 
      51             :     /* Stats. */
      52             :     XLogRecPtr  last_lsn;
      53             :     TimestampTz last_send_time;
      54             :     TimestampTz last_recv_time;
      55             :     XLogRecPtr  reply_lsn;
      56             :     TimestampTz reply_time;
      57             : } LogicalRepWorker;
      58             : 
      59             : /* Main memory context for apply worker. Permanent during worker lifetime. */
      60             : extern MemoryContext ApplyContext;
      61             : 
      62             : /* libpqreceiver connection */
      63             : extern struct WalReceiverConn *wrconn;
      64             : 
      65             : /* Worker and subscription objects. */
      66             : extern Subscription *MySubscription;
      67             : extern LogicalRepWorker *MyLogicalRepWorker;
      68             : 
      69             : extern bool in_remote_transaction;
      70             : 
      71             : extern void logicalrep_worker_attach(int slot);
      72             : extern LogicalRepWorker *logicalrep_worker_find(Oid subid, Oid relid,
      73             :                                                 bool only_running);
      74             : extern List *logicalrep_workers_find(Oid subid, bool only_running);
      75             : extern void logicalrep_worker_launch(Oid dbid, Oid subid, const char *subname,
      76             :                                      Oid userid, Oid relid);
      77             : extern void logicalrep_worker_stop(Oid subid, Oid relid);
      78             : extern void logicalrep_worker_stop_at_commit(Oid subid, Oid relid);
      79             : extern void logicalrep_worker_wakeup(Oid subid, Oid relid);
      80             : extern void logicalrep_worker_wakeup_ptr(LogicalRepWorker *worker);
      81             : 
      82             : extern int  logicalrep_sync_worker_count(Oid subid);
      83             : 
      84             : extern char *LogicalRepSyncTableStart(XLogRecPtr *origin_startpos);
      85             : void        process_syncing_tables(XLogRecPtr current_lsn);
      86             : void        invalidate_syncing_table_states(Datum arg, int cacheid,
      87             :                                             uint32 hashvalue);
      88             : 
      89             : static inline bool
      90        2730 : am_tablesync_worker(void)
      91             : {
      92        2730 :     return OidIsValid(MyLogicalRepWorker->relid);
      93             : }
      94             : 
      95             : #endif                          /* WORKER_INTERNAL_H */