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db_include/replication/worker_internal.h

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+/*-------------------------------------------------------------------------
+ *
+ * worker_internal.h
+ *	  Internal headers shared by logical replication workers.
+ *
+ * Portions Copyright (c) 2016-2021, PostgreSQL Global Development Group
+ *
+ * src/include/replication/worker_internal.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef WORKER_INTERNAL_H
+#define WORKER_INTERNAL_H
+
+#include <signal.h>
+
+#include "access/xlogdefs.h"
+#include "catalog/pg_subscription.h"
+#include "datatype/timestamp.h"
+#include "storage/lock.h"
+#include "storage/spin.h"
+
+
+typedef struct LogicalRepWorker
+{
+	/* Time at which this worker was launched. */
+	TimestampTz launch_time;
+
+	/* Indicates if this slot is used or free. */
+	bool		in_use;
+
+	/* Increased every time the slot is taken by new worker. */
+	uint16		generation;
+
+	/* Pointer to proc array. NULL if not running. */
+	PGPROC	   *proc;
+
+	/* Database id to connect to. */
+	Oid			dbid;
+
+	/* User to use for connection (will be same as owner of subscription). */
+	Oid			userid;
+
+	/* Subscription id for the worker. */
+	Oid			subid;
+
+	/* Used for initial table synchronization. */
+	Oid			relid;
+	char		relstate;
+	XLogRecPtr	relstate_lsn;
+	slock_t		relmutex;
+
+	/* Stats. */
+	XLogRecPtr	last_lsn;
+	TimestampTz last_send_time;
+	TimestampTz last_recv_time;
+	XLogRecPtr	reply_lsn;
+	TimestampTz reply_time;
+} LogicalRepWorker;
+
+/* Main memory context for apply worker. Permanent during worker lifetime. */
+extern MemoryContext ApplyContext;
+
+/* libpqreceiver connection */
+extern struct WalReceiverConn *LogRepWorkerWalRcvConn;
+
+/* Worker and subscription objects. */
+extern Subscription *MySubscription;
+extern LogicalRepWorker *MyLogicalRepWorker;
+
+extern bool in_remote_transaction;
+
+extern void logicalrep_worker_attach(int slot);
+extern LogicalRepWorker *logicalrep_worker_find(Oid subid, Oid relid,
+												bool only_running);
+extern List *logicalrep_workers_find(Oid subid, bool only_running);
+extern void logicalrep_worker_launch(Oid dbid, Oid subid, const char *subname,
+									 Oid userid, Oid relid);
+extern void logicalrep_worker_stop(Oid subid, Oid relid);
+extern void logicalrep_worker_wakeup(Oid subid, Oid relid);
+extern void logicalrep_worker_wakeup_ptr(LogicalRepWorker *worker);
+
+extern int	logicalrep_sync_worker_count(Oid subid);
+
+extern void ReplicationOriginNameForTablesync(Oid suboid, Oid relid,
+											  char *originname, int szorgname);
+extern char *LogicalRepSyncTableStart(XLogRecPtr *origin_startpos);
+
+void		process_syncing_tables(XLogRecPtr current_lsn);
+void		invalidate_syncing_table_states(Datum arg, int cacheid,
+											uint32 hashvalue);
+
+static inline bool
+am_tablesync_worker(void)
+{
+	return OidIsValid(MyLogicalRepWorker->relid);
+}
+
+#endif							/* WORKER_INTERNAL_H */