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 *wrconn;

/* 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_stop_at_commit(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 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 */