From b0e6e08b1981ebcdb2f3e7576de7ed0d004cfc16 Mon Sep 17 00:00:00 2001 From: Alvaro Herrera Date: Wed, 12 May 2021 19:13:54 -0400 Subject: [PATCH] Rename the logical replication global "wrconn" The worker.c global wrconn is only meant to be used by logical apply/ tablesync workers, but there are other variables with the same name. To reduce future confusion rename the global from "wrconn" to "LogRepWorkerWalRcvConn". While this is just cosmetic, it seems better to backpatch it all the way back to 10 where this code appeared, to avoid future backpatching issues. Author: Peter Smith Discussion: https://postgr.es/m/CAHut+Pu7Jv9L2BOEx_Z0UtJxfDevQSAUW2mJqWU+CtmDrEZVAg@mail.gmail.com --- src/backend/replication/logical/launcher.c | 4 ++-- src/backend/replication/logical/tablesync.c | 23 ++++++++++++--------- src/backend/replication/logical/worker.c | 22 ++++++++++---------- src/include/replication/worker_internal.h | 2 +- 4 files changed, 27 insertions(+), 24 deletions(-) diff --git a/src/backend/replication/logical/launcher.c b/src/backend/replication/logical/launcher.c index ada16adb67..7484f6cc0b 100644 --- a/src/backend/replication/logical/launcher.c +++ b/src/backend/replication/logical/launcher.c @@ -727,8 +727,8 @@ static void logicalrep_worker_onexit(int code, Datum arg) { /* Disconnect gracefully from the remote side. */ - if (wrconn) - walrcv_disconnect(wrconn); + if (LogRepWorkerWalRcvConn) + walrcv_disconnect(LogRepWorkerWalRcvConn); logicalrep_worker_detach(); diff --git a/src/backend/replication/logical/tablesync.c b/src/backend/replication/logical/tablesync.c index acc6498567..14f69a6338 100644 --- a/src/backend/replication/logical/tablesync.c +++ b/src/backend/replication/logical/tablesync.c @@ -303,7 +303,7 @@ process_syncing_tables_for_sync(XLogRecPtr current_lsn) MyLogicalRepWorker->relstate, MyLogicalRepWorker->relstate_lsn); - walrcv_endstreaming(wrconn, &tli); + walrcv_endstreaming(LogRepWorkerWalRcvConn, &tli); finish_sync_worker(); } else @@ -600,7 +600,7 @@ copy_read_data(void *outbuf, int minread, int maxread) for (;;) { /* Try read the data. */ - len = walrcv_receive(wrconn, &buf, &fd); + len = walrcv_receive(LogRepWorkerWalRcvConn, &buf, &fd); CHECK_FOR_INTERRUPTS(); @@ -678,7 +678,8 @@ fetch_remote_table_info(char *nspname, char *relname, " AND c.relkind = 'r'", quote_literal_cstr(nspname), quote_literal_cstr(relname)); - res = walrcv_exec(wrconn, cmd.data, 2, tableRow); + res = walrcv_exec(LogRepWorkerWalRcvConn, cmd.data, + lengthof(tableRow), tableRow); if (res->status != WALRCV_OK_TUPLES) ereport(ERROR, @@ -714,7 +715,8 @@ fetch_remote_table_info(char *nspname, char *relname, " AND a.attrelid = %u" " ORDER BY a.attnum", lrel->remoteid, lrel->remoteid); - res = walrcv_exec(wrconn, cmd.data, 4, attrRow); + res = walrcv_exec(LogRepWorkerWalRcvConn, cmd.data, + lengthof(attrRow), attrRow); if (res->status != WALRCV_OK_TUPLES) ereport(ERROR, @@ -784,7 +786,7 @@ copy_table(Relation rel) initStringInfo(&cmd); appendStringInfo(&cmd, "COPY %s TO STDOUT", quote_qualified_identifier(lrel.nspname, lrel.relname)); - res = walrcv_exec(wrconn, cmd.data, 0, NULL); + res = walrcv_exec(LogRepWorkerWalRcvConn, cmd.data, 0, NULL); pfree(cmd.data); if (res->status != WALRCV_OK_COPY_OUT) ereport(ERROR, @@ -850,8 +852,9 @@ LogicalRepSyncTableStart(XLogRecPtr *origin_startpos) * application_name, so that it is different from the main apply worker, * so that synchronous replication can distinguish them. */ - wrconn = walrcv_connect(MySubscription->conninfo, true, slotname, &err); - if (wrconn == NULL) + LogRepWorkerWalRcvConn = walrcv_connect(MySubscription->conninfo, true, + slotname, &err); + if (LogRepWorkerWalRcvConn == NULL) ereport(ERROR, (errmsg("could not connect to the publisher: %s", err))); @@ -896,7 +899,7 @@ LogicalRepSyncTableStart(XLogRecPtr *origin_startpos) * inside the transaction so that we can use the snapshot made * by the slot to get existing data. */ - res = walrcv_exec(wrconn, + res = walrcv_exec(LogRepWorkerWalRcvConn, "BEGIN READ ONLY ISOLATION LEVEL " "REPEATABLE READ", 0, NULL); if (res->status != WALRCV_OK_COMMAND) @@ -913,14 +916,14 @@ LogicalRepSyncTableStart(XLogRecPtr *origin_startpos) * that is consistent with the lsn used by the slot to start * decoding. */ - walrcv_create_slot(wrconn, slotname, true, + walrcv_create_slot(LogRepWorkerWalRcvConn, slotname, true, CRS_USE_SNAPSHOT, origin_startpos); PushActiveSnapshot(GetTransactionSnapshot()); copy_table(rel); PopActiveSnapshot(); - res = walrcv_exec(wrconn, "COMMIT", 0, NULL); + res = walrcv_exec(LogRepWorkerWalRcvConn, "COMMIT", 0, NULL); if (res->status != WALRCV_OK_COMMAND) ereport(ERROR, (errmsg("table copy could not finish transaction on publisher"), diff --git a/src/backend/replication/logical/worker.c b/src/backend/replication/logical/worker.c index 55eecc3035..bd27ef3b85 100644 --- a/src/backend/replication/logical/worker.c +++ b/src/backend/replication/logical/worker.c @@ -112,7 +112,7 @@ typedef struct SlotErrCallbackArg static MemoryContext ApplyMessageContext = NULL; MemoryContext ApplyContext = NULL; -WalReceiverConn *wrconn = NULL; +WalReceiverConn *LogRepWorkerWalRcvConn = NULL; Subscription *MySubscription = NULL; bool MySubscriptionValid = false; @@ -1172,7 +1172,7 @@ LogicalRepApplyLoop(XLogRecPtr last_received) MemoryContextSwitchTo(ApplyMessageContext); - len = walrcv_receive(wrconn, &buf, &fd); + len = walrcv_receive(LogRepWorkerWalRcvConn, &buf, &fd); if (len != 0) { @@ -1252,7 +1252,7 @@ LogicalRepApplyLoop(XLogRecPtr last_received) MemoryContextReset(ApplyMessageContext); } - len = walrcv_receive(wrconn, &buf, &fd); + len = walrcv_receive(LogRepWorkerWalRcvConn, &buf, &fd); } } @@ -1282,7 +1282,7 @@ LogicalRepApplyLoop(XLogRecPtr last_received) { TimeLineID tli; - walrcv_endstreaming(wrconn, &tli); + walrcv_endstreaming(LogRepWorkerWalRcvConn, &tli); break; } @@ -1449,7 +1449,8 @@ send_feedback(XLogRecPtr recvpos, bool force, bool requestReply) (uint32) (flushpos >> 32), (uint32) flushpos ); - walrcv_send(wrconn, reply_message->data, reply_message->len); + walrcv_send(LogRepWorkerWalRcvConn, + reply_message->data, reply_message->len); if (recvpos > last_recvpos) last_recvpos = recvpos; @@ -1761,9 +1762,9 @@ ApplyWorkerMain(Datum main_arg) origin_startpos = replorigin_session_get_progress(false); CommitTransactionCommand(); - wrconn = walrcv_connect(MySubscription->conninfo, true, MySubscription->name, - &err); - if (wrconn == NULL) + LogRepWorkerWalRcvConn = walrcv_connect(MySubscription->conninfo, true, + MySubscription->name, &err); + if (LogRepWorkerWalRcvConn == NULL) ereport(ERROR, (errmsg("could not connect to the publisher: %s", err))); @@ -1771,9 +1772,8 @@ ApplyWorkerMain(Datum main_arg) * We don't really use the output identify_system for anything but it * does some initializations on the upstream so let's still call it. */ - (void) walrcv_identify_system(wrconn, &startpointTLI, + (void) walrcv_identify_system(LogRepWorkerWalRcvConn, &startpointTLI, &server_version); - } /* @@ -1792,7 +1792,7 @@ ApplyWorkerMain(Datum main_arg) options.proto.logical.publication_names = MySubscription->publications; /* Start normal logical streaming replication. */ - walrcv_startstreaming(wrconn, &options); + walrcv_startstreaming(LogRepWorkerWalRcvConn, &options); /* Run the main loop. */ LogicalRepApplyLoop(origin_startpos); diff --git a/src/include/replication/worker_internal.h b/src/include/replication/worker_internal.h index 1ce3b6b058..5ea7fd2bd6 100644 --- a/src/include/replication/worker_internal.h +++ b/src/include/replication/worker_internal.h @@ -60,7 +60,7 @@ typedef struct LogicalRepWorker extern MemoryContext ApplyContext; /* libpqreceiver connection */ -extern struct WalReceiverConn *wrconn; +extern struct WalReceiverConn *LogRepWorkerWalRcvConn; /* Worker and subscription objects. */ extern Subscription *MySubscription;