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/*------------------------------------------------------------------------- * * walreceiver.h * Exports from replication/walreceiverfuncs.c. * * Portions Copyright (c) 2010-2012, PostgreSQL Global Development Group * * src/include/replication/walreceiver.h * *------------------------------------------------------------------------- */ #ifndef _WALRECEIVER_H #define _WALRECEIVER_H #include "access/xlog.h" #include "access/xlogdefs.h" #include "storage/spin.h" #include "pgtime.h" extern int wal_receiver_status_interval; extern bool hot_standby_feedback; /* * MAXCONNINFO: maximum size of a connection string. * * XXX: Should this move to pg_config_manual.h? */ #define MAXCONNINFO 1024 /* Can we allow the standby to accept replication connection from another standby? */ #define AllowCascadeReplication() (EnableHotStandby && max_wal_senders > 0) /* * Values for WalRcv->walRcvState. */ typedef enum { WALRCV_STOPPED, /* stopped and mustn't start up again */ WALRCV_STARTING, /* launched, but the process hasn't * initialized yet */ WALRCV_RUNNING, /* walreceiver is running */ WALRCV_STOPPING /* requested to stop, but still running */ } WalRcvState; /* Shared memory area for management of walreceiver process */ typedef struct { /* * PID of currently active walreceiver process, its current state and * start time (actually, the time at which it was requested to be * started). */ pid_t pid; WalRcvState walRcvState; pg_time_t startTime; /* * receiveStart is the first byte position that will be received. When * startup process starts the walreceiver, it sets receiveStart to the * point where it wants the streaming to begin. */ XLogRecPtr receiveStart; /* * receivedUpto-1 is the last byte position that has already been * received. At the first startup of walreceiver, receivedUpto is set to * receiveStart. After that, walreceiver updates this whenever it flushes * the received WAL to disk. */ XLogRecPtr receivedUpto; /* * latestChunkStart is the starting byte position of the current "batch" * of received WAL. It's actually the same as the previous value of * receivedUpto before the last flush to disk. Startup process can use * this to detect whether it's keeping up or not. */ XLogRecPtr latestChunkStart; /* * Time of send and receive of any message received. */ TimestampTz lastMsgSendTime; TimestampTz lastMsgReceiptTime; /* * Latest reported end of WAL on the sender */ XLogRecPtr latestWalEnd; TimestampTz latestWalEndTime; /* * connection string; is used for walreceiver to connect with the primary. */ char conninfo[MAXCONNINFO]; slock_t mutex; /* locks shared variables shown above */ } WalRcvData; extern WalRcvData *WalRcv; /* libpqwalreceiver hooks */ typedef bool (*walrcv_connect_type) (char *conninfo, XLogRecPtr startpoint); extern PGDLLIMPORT walrcv_connect_type walrcv_connect; typedef bool (*walrcv_receive_type) (int timeout, unsigned char *type, char **buffer, int *len); extern PGDLLIMPORT walrcv_receive_type walrcv_receive; typedef void (*walrcv_send_type) (const char *buffer, int nbytes); extern PGDLLIMPORT walrcv_send_type walrcv_send; typedef void (*walrcv_disconnect_type) (void); extern PGDLLIMPORT walrcv_disconnect_type walrcv_disconnect; /* prototypes for functions in walreceiver.c */ extern void WalReceiverMain(void); /* prototypes for functions in walreceiverfuncs.c */ extern Size WalRcvShmemSize(void); extern void WalRcvShmemInit(void); extern void ShutdownWalRcv(void); extern bool WalRcvInProgress(void); extern void RequestXLogStreaming(XLogRecPtr recptr, const char *conninfo); extern XLogRecPtr GetWalRcvWriteRecPtr(XLogRecPtr *latestChunkStart); extern int GetReplicationApplyDelay(void); extern int GetReplicationTransferLatency(void); #endif /* _WALRECEIVER_H */