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264aa14a2f
This allows decorating pg_fatal() with noreturn compiler hints, leading to better diagnostics. Reviewed-by: Marko Tiikkaja <marko@joh.to>
347 lines
9.4 KiB
C
347 lines
9.4 KiB
C
/*
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* server.c
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*
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* database server functions
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*
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* Copyright (c) 2010-2013, PostgreSQL Global Development Group
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* contrib/pg_upgrade/server.c
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*/
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#include "postgres_fe.h"
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#include "pg_upgrade.h"
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static PGconn *get_db_conn(ClusterInfo *cluster, const char *db_name);
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/*
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* connectToServer()
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*
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* Connects to the desired database on the designated server.
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* If the connection attempt fails, this function logs an error
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* message and calls exit() to kill the program.
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*/
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PGconn *
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connectToServer(ClusterInfo *cluster, const char *db_name)
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{
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PGconn *conn = get_db_conn(cluster, db_name);
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if (conn == NULL || PQstatus(conn) != CONNECTION_OK)
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{
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pg_log(PG_REPORT, "connection to database failed: %s\n",
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PQerrorMessage(conn));
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if (conn)
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PQfinish(conn);
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printf("Failure, exiting\n");
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exit(1);
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}
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return conn;
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}
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/*
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* get_db_conn()
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*
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* get database connection, using named database + standard params for cluster
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*/
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static PGconn *
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get_db_conn(ClusterInfo *cluster, const char *db_name)
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{
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char conn_opts[2 * NAMEDATALEN + MAXPGPATH + 100];
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if (cluster->sockdir)
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snprintf(conn_opts, sizeof(conn_opts),
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"dbname = '%s' user = '%s' host = '%s' port = %d",
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db_name, os_info.user, cluster->sockdir, cluster->port);
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else
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snprintf(conn_opts, sizeof(conn_opts),
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"dbname = '%s' user = '%s' port = %d",
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db_name, os_info.user, cluster->port);
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return PQconnectdb(conn_opts);
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}
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/*
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* cluster_conn_opts()
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*
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* Return standard command-line options for connecting to this cluster when
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* using psql, pg_dump, etc. Ideally this would match what get_db_conn()
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* sets, but the utilities we need aren't very consistent about the treatment
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* of database name options, so we leave that out.
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*
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* Note result is in static storage, so use it right away.
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*/
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char *
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cluster_conn_opts(ClusterInfo *cluster)
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{
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static char conn_opts[MAXPGPATH + NAMEDATALEN + 100];
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if (cluster->sockdir)
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snprintf(conn_opts, sizeof(conn_opts),
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"--host \"%s\" --port %d --username \"%s\"",
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cluster->sockdir, cluster->port, os_info.user);
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else
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snprintf(conn_opts, sizeof(conn_opts),
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"--port %d --username \"%s\"",
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cluster->port, os_info.user);
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return conn_opts;
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}
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/*
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* executeQueryOrDie()
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*
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* Formats a query string from the given arguments and executes the
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* resulting query. If the query fails, this function logs an error
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* message and calls exit() to kill the program.
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*/
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PGresult *
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executeQueryOrDie(PGconn *conn, const char *fmt,...)
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{
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static char command[8192];
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va_list args;
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PGresult *result;
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ExecStatusType status;
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va_start(args, fmt);
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vsnprintf(command, sizeof(command), fmt, args);
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va_end(args);
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pg_log(PG_VERBOSE, "executing: %s\n", command);
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result = PQexec(conn, command);
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status = PQresultStatus(result);
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if ((status != PGRES_TUPLES_OK) && (status != PGRES_COMMAND_OK))
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{
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pg_log(PG_REPORT, "SQL command failed\n%s\n%s\n", command,
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PQerrorMessage(conn));
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PQclear(result);
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PQfinish(conn);
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printf("Failure, exiting\n");
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exit(1);
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}
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else
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return result;
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}
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/*
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* get_major_server_version()
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*
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* gets the version (in unsigned int form) for the given datadir. Assumes
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* that datadir is an absolute path to a valid pgdata directory. The version
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* is retrieved by reading the PG_VERSION file.
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*/
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uint32
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get_major_server_version(ClusterInfo *cluster)
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{
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FILE *version_fd;
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char ver_filename[MAXPGPATH];
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int integer_version = 0;
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int fractional_version = 0;
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snprintf(ver_filename, sizeof(ver_filename), "%s/PG_VERSION",
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cluster->pgdata);
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if ((version_fd = fopen(ver_filename, "r")) == NULL)
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pg_fatal("could not open version file: %s\n", ver_filename);
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if (fscanf(version_fd, "%63s", cluster->major_version_str) == 0 ||
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sscanf(cluster->major_version_str, "%d.%d", &integer_version,
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&fractional_version) != 2)
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pg_fatal("could not get version from %s\n", cluster->pgdata);
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fclose(version_fd);
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return (100 * integer_version + fractional_version) * 100;
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}
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static void
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stop_postmaster_atexit(void)
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{
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stop_postmaster(true);
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}
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bool
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start_postmaster(ClusterInfo *cluster, bool throw_error)
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{
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char cmd[MAXPGPATH * 4 + 1000];
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PGconn *conn;
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bool exit_hook_registered = false;
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bool pg_ctl_return = false;
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char socket_string[MAXPGPATH + 200];
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if (!exit_hook_registered)
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{
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atexit(stop_postmaster_atexit);
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exit_hook_registered = true;
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}
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socket_string[0] = '\0';
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#ifdef HAVE_UNIX_SOCKETS
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/* prevent TCP/IP connections, restrict socket access */
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strcat(socket_string,
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" -c listen_addresses='' -c unix_socket_permissions=0700");
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/* Have a sockdir? Tell the postmaster. */
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if (cluster->sockdir)
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snprintf(socket_string + strlen(socket_string),
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sizeof(socket_string) - strlen(socket_string),
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" -c %s='%s'",
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(GET_MAJOR_VERSION(cluster->major_version) < 903) ?
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"unix_socket_directory" : "unix_socket_directories",
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cluster->sockdir);
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#endif
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/*
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* Using autovacuum=off disables cleanup vacuum and analyze, but freeze
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* vacuums can still happen, so we set autovacuum_freeze_max_age to its
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* maximum. We assume all datfrozenxid and relfrozen values are less than
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* a gap of 2000000000 from the current xid counter, so autovacuum will
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* not touch them.
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*
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* Turn off durability requirements to improve object creation speed, and
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* we only modify the new cluster, so only use it there. If there is a
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* crash, the new cluster has to be recreated anyway. fsync=off is a big
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* win on ext4.
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*/
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snprintf(cmd, sizeof(cmd),
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"\"%s/pg_ctl\" -w -l \"%s\" -D \"%s\" -o \"-p %d%s%s %s%s\" start",
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cluster->bindir, SERVER_LOG_FILE, cluster->pgconfig, cluster->port,
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(cluster->controldata.cat_ver >=
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BINARY_UPGRADE_SERVER_FLAG_CAT_VER) ? " -b" :
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" -c autovacuum=off -c autovacuum_freeze_max_age=2000000000",
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(cluster == &new_cluster) ?
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" -c synchronous_commit=off -c fsync=off -c full_page_writes=off" : "",
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cluster->pgopts ? cluster->pgopts : "", socket_string);
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/*
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* Don't throw an error right away, let connecting throw the error because
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* it might supply a reason for the failure.
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*/
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pg_ctl_return = exec_prog(SERVER_START_LOG_FILE,
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/* pass both file names if they differ */
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(strcmp(SERVER_LOG_FILE,
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SERVER_START_LOG_FILE) != 0) ?
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SERVER_LOG_FILE : NULL,
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false,
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"%s", cmd);
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/* Did it fail and we are just testing if the server could be started? */
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if (!pg_ctl_return && !throw_error)
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return false;
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/*
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* We set this here to make sure atexit() shuts down the server,
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* but only if we started the server successfully. We do it
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* before checking for connectivity in case the server started but
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* there is a connectivity failure. If pg_ctl did not return success,
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* we will exit below.
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*
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* Pre-9.1 servers do not have PQping(), so we could be leaving the server
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* running if authentication was misconfigured, so someday we might went to
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* be more aggressive about doing server shutdowns even if pg_ctl fails,
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* but now (2013-08-14) it seems prudent to be cautious. We don't want to
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* shutdown a server that might have been accidentally started during the
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* upgrade.
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*/
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if (pg_ctl_return)
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os_info.running_cluster = cluster;
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/*
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* pg_ctl -w might have failed because the server couldn't be started,
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* or there might have been a connection problem in _checking_ if the
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* server has started. Therefore, even if pg_ctl failed, we continue
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* and test for connectivity in case we get a connection reason for the
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* failure.
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*/
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if ((conn = get_db_conn(cluster, "template1")) == NULL ||
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PQstatus(conn) != CONNECTION_OK)
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{
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pg_log(PG_REPORT, "\nconnection to database failed: %s\n",
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PQerrorMessage(conn));
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if (conn)
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PQfinish(conn);
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pg_fatal("could not connect to %s postmaster started with the command:\n"
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"%s\n",
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CLUSTER_NAME(cluster), cmd);
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}
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PQfinish(conn);
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/*
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* If pg_ctl failed, and the connection didn't fail, and throw_error is
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* enabled, fail now. This could happen if the server was already running.
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*/
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if (!pg_ctl_return)
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pg_fatal("pg_ctl failed to start the %s server, or connection failed\n",
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CLUSTER_NAME(cluster));
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return true;
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}
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void
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stop_postmaster(bool fast)
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{
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ClusterInfo *cluster;
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if (os_info.running_cluster == &old_cluster)
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cluster = &old_cluster;
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else if (os_info.running_cluster == &new_cluster)
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cluster = &new_cluster;
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else
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return; /* no cluster running */
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exec_prog(SERVER_STOP_LOG_FILE, NULL, !fast,
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"\"%s/pg_ctl\" -w -D \"%s\" -o \"%s\" %s stop",
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cluster->bindir, cluster->pgconfig,
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cluster->pgopts ? cluster->pgopts : "",
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fast ? "-m fast" : "");
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os_info.running_cluster = NULL;
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}
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/*
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* check_pghost_envvar()
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*
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* Tests that PGHOST does not point to a non-local server
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*/
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void
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check_pghost_envvar(void)
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{
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PQconninfoOption *option;
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PQconninfoOption *start;
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/* Get valid libpq env vars from the PQconndefaults function */
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start = PQconndefaults();
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for (option = start; option->keyword != NULL; option++)
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{
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if (option->envvar && (strcmp(option->envvar, "PGHOST") == 0 ||
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strcmp(option->envvar, "PGHOSTADDR") == 0))
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{
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const char *value = getenv(option->envvar);
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if (value && strlen(value) > 0 &&
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/* check for 'local' host values */
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(strcmp(value, "localhost") != 0 && strcmp(value, "127.0.0.1") != 0 &&
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strcmp(value, "::1") != 0 && value[0] != '/'))
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pg_fatal("libpq environment variable %s has a non-local server value: %s\n",
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option->envvar, value);
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}
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}
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/* Free the memory that libpq allocated on our behalf */
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PQconninfoFree(start);
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}
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