Process options from the startup packed in walsender. Only few options

make sense for walsender, but for example application_name and client_encoding
do. We still don't apply per-role settings from pg_db_role_setting, because
that would require connecting to a database to read the table.

Fujii Masao

Author: hlinnaka

src/backend/utils/init/postinit.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.213 2010/07/06 19:18:58 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.214 2010/09/13 09:00:30 heikki Exp $
  *
  *
  *-------------------------------------------------------------------------
@@ -65,6 +65,7 @@ static void CheckMyDatabase(const char *name, bool am_superuser);
 static void InitCommunication(void);
 static void ShutdownPostgres(int code, Datum arg);
 static bool ThereIsAtLeastOneRole(void);
+static void process_startup_options(Port *port, bool am_superuser);
 static void process_settings(Oid databaseid, Oid roleid);
 
 
@@ -476,7 +477,6 @@ InitPostgres(const char *in_dbname, Oid dboid, const char *username,
 {
 	bool		bootstrap = IsBootstrapProcessingMode();
 	bool		am_superuser;
-	GucContext	gucctx;
 	char	   *fullpath;
 	char		dbname[NAMEDATALEN];
 
@@ -650,21 +650,37 @@ InitPostgres(const char *in_dbname, Oid dboid, const char *username,
 				 errmsg("remaining connection slots are reserved for non-replication superuser connections")));
 
 	/*
-	 * If walsender, we're done here --- we don't want to connect to any
-	 * particular database.
+	 * If walsender, we don't want to connect to any particular database.
+	 * Just finish the backend startup by processing any options from the
+	 * startup packet, and we're done.
 	 */
 	if (am_walsender)
 	{
 		Assert(!bootstrap);
+
 		/* must have authenticated as a superuser */
 		if (!am_superuser)
 			ereport(FATAL,
 					(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
 					 errmsg("must be superuser to start walsender")));
+
+		/* process any options passed in the startup packet */
+		if (MyProcPort != NULL)
+			process_startup_options(MyProcPort, am_superuser);
+
+		/* Apply PostAuthDelay as soon as we've read all options */
+		if (PostAuthDelay > 0)
+			pg_usleep(PostAuthDelay * 1000000L);
+
+		/* initialize client encoding */
+		InitializeClientEncoding();
+
 		/* report this backend in the PgBackendStatus array */
 		pgstat_bestart();
+
 		/* close the transaction we started above */
 		CommitTransactionCommand();
+
 		return;
 	}
 
@@ -811,33 +827,76 @@ InitPostgres(const char *in_dbname, Oid dboid, const char *username,
 		CheckMyDatabase(dbname, am_superuser);
 
 	/*
-	 * Now process any command-line switches that were included in the startup
-	 * packet, if we are in a regular backend.	We couldn't do this before
+	 * Now process any command-line switches and any additional GUC variable
+	 * settings passed in the startup packet.	We couldn't do this before
 	 * because we didn't know if client is a superuser.
 	 */
+	if (MyProcPort != NULL)
+		process_startup_options(MyProcPort, am_superuser);
+
+	/* Process pg_db_role_setting options */
+	process_settings(MyDatabaseId, GetSessionUserId());
+
+	/* Apply PostAuthDelay as soon as we've read all options */
+	if (PostAuthDelay > 0)
+		pg_usleep(PostAuthDelay * 1000000L);
+
+	/*
+	 * Initialize various default states that can't be set up until we've
+	 * selected the active user and gotten the right GUC settings.
+	 */
+
+	/* set default namespace search path */
+	InitializeSearchPath();
+
+	/* initialize client encoding */
+	InitializeClientEncoding();
+
+	/* report this backend in the PgBackendStatus array */
+	if (!bootstrap)
+		pgstat_bestart();
+
+	/* close the transaction we started above */
+	if (!bootstrap)
+		CommitTransactionCommand();
+}
+
+/*
+ * Process any command-line switches and any additional GUC variable
+ * settings passed in the startup packet.
+ */
+static void
+process_startup_options(Port *port, bool am_superuser)
+{
+	GucContext	gucctx;
+	ListCell   *gucopts;
+
 	gucctx = am_superuser ? PGC_SUSET : PGC_BACKEND;
 
-	if (MyProcPort != NULL &&
-		MyProcPort->cmdline_options != NULL)
+	/*
+	 * First process any command-line switches that were included in the
+	 * startup packet, if we are in a regular backend.
+	 */
+	if (port->cmdline_options != NULL)
 	{
 		/*
 		 * The maximum possible number of commandline arguments that could
-		 * come from MyProcPort->cmdline_options is (strlen + 1) / 2; see
+		 * come from port->cmdline_options is (strlen + 1) / 2; see
 		 * pg_split_opts().
 		 */
 		char	  **av;
 		int			maxac;
 		int			ac;
 
-		maxac = 2 + (strlen(MyProcPort->cmdline_options) + 1) / 2;
+		maxac = 2 + (strlen(port->cmdline_options) + 1) / 2;
 
 		av = (char **) palloc(maxac * sizeof(char *));
 		ac = 0;
 
 		av[ac++] = "postgres";
 
-		/* Note this mangles MyProcPort->cmdline_options */
-		pg_split_opts(av, &ac, MyProcPort->cmdline_options);
+		/* Note this mangles port->cmdline_options */
+		pg_split_opts(av, &ac, port->cmdline_options);
 
 		av[ac] = NULL;
 
@@ -850,50 +909,20 @@ InitPostgres(const char *in_dbname, Oid dboid, const char *username,
 	 * Process any additional GUC variable settings passed in startup packet.
 	 * These are handled exactly like command-line variables.
 	 */
-	if (MyProcPort != NULL)
+	gucopts = list_head(port->guc_options);
+	while (gucopts)
 	{
-		ListCell   *gucopts = list_head(MyProcPort->guc_options);
-
-		while (gucopts)
-		{
-			char	   *name;
-			char	   *value;
+		char	   *name;
+		char	   *value;
 
-			name = lfirst(gucopts);
-			gucopts = lnext(gucopts);
+		name = lfirst(gucopts);
+		gucopts = lnext(gucopts);
 
-			value = lfirst(gucopts);
-			gucopts = lnext(gucopts);
+		value = lfirst(gucopts);
+		gucopts = lnext(gucopts);
 
-			SetConfigOption(name, value, gucctx, PGC_S_CLIENT);
-		}
+		SetConfigOption(name, value, gucctx, PGC_S_CLIENT);
 	}
-
-	/* Process pg_db_role_setting options */
-	process_settings(MyDatabaseId, GetSessionUserId());
-
-	/* Apply PostAuthDelay as soon as we've read all options */
-	if (PostAuthDelay > 0)
-		pg_usleep(PostAuthDelay * 1000000L);
-
-	/*
-	 * Initialize various default states that can't be set up until we've
-	 * selected the active user and gotten the right GUC settings.
-	 */
-
-	/* set default namespace search path */
-	InitializeSearchPath();
-
-	/* initialize client encoding */
-	InitializeClientEncoding();
-
-	/* report this backend in the PgBackendStatus array */
-	if (!bootstrap)
-		pgstat_bestart();
-
-	/* close the transaction we started above */
-	if (!bootstrap)
-		CommitTransactionCommand();
 }
 
 /*