/src/bin/pg_upgrade/server.c
C | 385 lines | 223 code | 60 blank | 102 comment | 54 complexity | 753486eea5ba4e0464aaec3ee7b00c98 MD5 | raw file
Possible License(s): AGPL-3.0
- /*
- * server.c
- *
- * database server functions
- *
- * Copyright (c) 2010-2018, PostgreSQL Global Development Group
- * src/bin/pg_upgrade/server.c
- */
- #include "postgres_fe.h"
- #include "fe_utils/connect.h"
- #include "fe_utils/string_utils.h"
- #include "pg_upgrade.h"
- static PGconn *get_db_conn(ClusterInfo *cluster, const char *db_name);
- /*
- * connectToServer()
- *
- * Connects to the desired database on the designated server.
- * If the connection attempt fails, this function logs an error
- * message and calls exit() to kill the program.
- */
- PGconn *
- connectToServer(ClusterInfo *cluster, const char *db_name)
- {
- PGconn *conn = get_db_conn(cluster, db_name);
- if (conn == NULL || PQstatus(conn) != CONNECTION_OK)
- {
- pg_log(PG_REPORT, "connection to database failed: %s",
- PQerrorMessage(conn));
- if (conn)
- PQfinish(conn);
- printf(_("Failure, exiting\n"));
- exit(1);
- }
- PQclear(executeQueryOrDie(conn, ALWAYS_SECURE_SEARCH_PATH_SQL));
- return conn;
- }
- /*
- * get_db_conn()
- *
- * get database connection, using named database + standard params for cluster
- */
- static PGconn *
- get_db_conn(ClusterInfo *cluster, const char *db_name)
- {
- PQExpBufferData conn_opts;
- PGconn *conn;
- /* Build connection string with proper quoting */
- initPQExpBuffer(&conn_opts);
- appendPQExpBufferStr(&conn_opts, "dbname=");
- appendConnStrVal(&conn_opts, db_name);
- appendPQExpBufferStr(&conn_opts, " user=");
- appendConnStrVal(&conn_opts, os_info.user);
- appendPQExpBuffer(&conn_opts, " port=%d", cluster->port);
- if (cluster->sockdir)
- {
- appendPQExpBufferStr(&conn_opts, " host=");
- appendConnStrVal(&conn_opts, cluster->sockdir);
- }
- conn = PQconnectdb(conn_opts.data);
- termPQExpBuffer(&conn_opts);
- return conn;
- }
- /*
- * cluster_conn_opts()
- *
- * Return standard command-line options for connecting to this cluster when
- * using psql, pg_dump, etc. Ideally this would match what get_db_conn()
- * sets, but the utilities we need aren't very consistent about the treatment
- * of database name options, so we leave that out.
- *
- * Result is valid until the next call to this function.
- */
- char *
- cluster_conn_opts(ClusterInfo *cluster)
- {
- static PQExpBuffer buf;
- if (buf == NULL)
- buf = createPQExpBuffer();
- else
- resetPQExpBuffer(buf);
- if (cluster->sockdir)
- {
- appendPQExpBufferStr(buf, "--host ");
- appendShellString(buf, cluster->sockdir);
- appendPQExpBufferChar(buf, ' ');
- }
- appendPQExpBuffer(buf, "--port %d --username ", cluster->port);
- appendShellString(buf, os_info.user);
- return buf->data;
- }
- /*
- * executeQueryOrDie()
- *
- * Formats a query string from the given arguments and executes the
- * resulting query. If the query fails, this function logs an error
- * message and calls exit() to kill the program.
- */
- PGresult *
- executeQueryOrDie(PGconn *conn, const char *fmt,...)
- {
- static char query[QUERY_ALLOC];
- va_list args;
- PGresult *result;
- ExecStatusType status;
- va_start(args, fmt);
- vsnprintf(query, sizeof(query), fmt, args);
- va_end(args);
- pg_log(PG_VERBOSE, "executing: %s\n", query);
- result = PQexec(conn, query);
- status = PQresultStatus(result);
- if ((status != PGRES_TUPLES_OK) && (status != PGRES_COMMAND_OK))
- {
- pg_log(PG_REPORT, "SQL command failed\n%s\n%s", query,
- PQerrorMessage(conn));
- PQclear(result);
- PQfinish(conn);
- printf(_("Failure, exiting\n"));
- exit(1);
- }
- else
- return result;
- }
- /*
- * get_major_server_version()
- *
- * gets the version (in unsigned int form) for the given datadir. Assumes
- * that datadir is an absolute path to a valid pgdata directory. The version
- * is retrieved by reading the PG_VERSION file.
- */
- uint32
- get_major_server_version(ClusterInfo *cluster)
- {
- FILE *version_fd;
- char ver_filename[MAXPGPATH];
- int v1 = 0,
- v2 = 0;
- snprintf(ver_filename, sizeof(ver_filename), "%s/PG_VERSION",
- cluster->pgdata);
- if ((version_fd = fopen(ver_filename, "r")) == NULL)
- pg_fatal("could not open version file: %s\n", ver_filename);
- if (fscanf(version_fd, "%63s", cluster->major_version_str) == 0 ||
- sscanf(cluster->major_version_str, "%d.%d", &v1, &v2) < 1)
- pg_fatal("could not parse PG_VERSION file from %s\n", cluster->pgdata);
- fclose(version_fd);
- if (v1 < 10)
- {
- /* old style, e.g. 9.6.1 */
- return v1 * 10000 + v2 * 100;
- }
- else
- {
- /* new style, e.g. 10.1 */
- return v1 * 10000;
- }
- }
- static void
- stop_postmaster_atexit(void)
- {
- stop_postmaster(true);
- }
- bool
- start_postmaster(ClusterInfo *cluster, bool report_and_exit_on_error)
- {
- char cmd[MAXPGPATH * 4 + 1000];
- PGconn *conn;
- bool pg_ctl_return = false;
- char socket_string[MAXPGPATH + 200];
- static bool exit_hook_registered = false;
- if (!exit_hook_registered)
- {
- atexit(stop_postmaster_atexit);
- exit_hook_registered = true;
- }
- socket_string[0] = '\0';
- #ifdef HAVE_UNIX_SOCKETS
- /* prevent TCP/IP connections, restrict socket access */
- strcat(socket_string,
- " -c listen_addresses='' -c unix_socket_permissions=0700");
- /* Have a sockdir? Tell the postmaster. */
- if (cluster->sockdir)
- snprintf(socket_string + strlen(socket_string),
- sizeof(socket_string) - strlen(socket_string),
- " -c %s='%s'",
- (GET_MAJOR_VERSION(cluster->major_version) < 903) ?
- "unix_socket_directory" : "unix_socket_directories",
- cluster->sockdir);
- #endif
- /*
- * Since PG 9.1, we have used -b to disable autovacuum. For earlier
- * releases, setting autovacuum=off disables cleanup vacuum and analyze,
- * but freeze vacuums can still happen, so we set
- * autovacuum_freeze_max_age to its maximum.
- * (autovacuum_multixact_freeze_max_age was introduced after 9.1, so there
- * is no need to set that.) We assume all datfrozenxid and relfrozenxid
- * values are less than a gap of 2000000000 from the current xid counter,
- * so autovacuum will not touch them.
- *
- * Turn off durability requirements to improve object creation speed, and
- * we only modify the new cluster, so only use it there. If there is a
- * crash, the new cluster has to be recreated anyway. fsync=off is a big
- * win on ext4.
- */
- snprintf(cmd, sizeof(cmd),
- "\"%s/pg_ctl\" -w -l \"%s\" -D \"%s\" -o \"-p %d%s%s %s%s\" start",
- cluster->bindir, SERVER_LOG_FILE, cluster->pgconfig, cluster->port,
- (cluster->controldata.cat_ver >=
- BINARY_UPGRADE_SERVER_FLAG_CAT_VER) ? " -b" :
- " -c autovacuum=off -c autovacuum_freeze_max_age=2000000000",
- (cluster == &new_cluster) ?
- " -c synchronous_commit=off -c fsync=off -c full_page_writes=off" : "",
- cluster->pgopts ? cluster->pgopts : "", socket_string);
- /*
- * Don't throw an error right away, let connecting throw the error because
- * it might supply a reason for the failure.
- */
- pg_ctl_return = exec_prog(SERVER_START_LOG_FILE,
- /* pass both file names if they differ */
- (strcmp(SERVER_LOG_FILE,
- SERVER_START_LOG_FILE) != 0) ?
- SERVER_LOG_FILE : NULL,
- report_and_exit_on_error, false,
- "%s", cmd);
- /* Did it fail and we are just testing if the server could be started? */
- if (!pg_ctl_return && !report_and_exit_on_error)
- return false;
- /*
- * We set this here to make sure atexit() shuts down the server, but only
- * if we started the server successfully. We do it before checking for
- * connectivity in case the server started but there is a connectivity
- * failure. If pg_ctl did not return success, we will exit below.
- *
- * Pre-9.1 servers do not have PQping(), so we could be leaving the server
- * running if authentication was misconfigured, so someday we might went
- * to be more aggressive about doing server shutdowns even if pg_ctl
- * fails, but now (2013-08-14) it seems prudent to be cautious. We don't
- * want to shutdown a server that might have been accidentally started
- * during the upgrade.
- */
- if (pg_ctl_return)
- os_info.running_cluster = cluster;
- /*
- * pg_ctl -w might have failed because the server couldn't be started, or
- * there might have been a connection problem in _checking_ if the server
- * has started. Therefore, even if pg_ctl failed, we continue and test
- * for connectivity in case we get a connection reason for the failure.
- */
- if ((conn = get_db_conn(cluster, "template1")) == NULL ||
- PQstatus(conn) != CONNECTION_OK)
- {
- pg_log(PG_REPORT, "\nconnection to database failed: %s",
- PQerrorMessage(conn));
- if (conn)
- PQfinish(conn);
- if (cluster == &old_cluster)
- pg_fatal("could not connect to source postmaster started with the command:\n"
- "%s\n",
- cmd);
- else
- pg_fatal("could not connect to target postmaster started with the command:\n"
- "%s\n",
- cmd);
- }
- PQfinish(conn);
- /*
- * If pg_ctl failed, and the connection didn't fail, and
- * report_and_exit_on_error is enabled, fail now. This could happen if
- * the server was already running.
- */
- if (!pg_ctl_return)
- {
- if (cluster == &old_cluster)
- pg_fatal("pg_ctl failed to start the source server, or connection failed\n");
- else
- pg_fatal("pg_ctl failed to start the target server, or connection failed\n");
- }
- return true;
- }
- void
- stop_postmaster(bool in_atexit)
- {
- ClusterInfo *cluster;
- if (os_info.running_cluster == &old_cluster)
- cluster = &old_cluster;
- else if (os_info.running_cluster == &new_cluster)
- cluster = &new_cluster;
- else
- return; /* no cluster running */
- exec_prog(SERVER_STOP_LOG_FILE, NULL, !in_atexit, !in_atexit,
- "\"%s/pg_ctl\" -w -D \"%s\" -o \"%s\" %s stop",
- cluster->bindir, cluster->pgconfig,
- cluster->pgopts ? cluster->pgopts : "",
- in_atexit ? "-m fast" : "-m smart");
- os_info.running_cluster = NULL;
- }
- /*
- * check_pghost_envvar()
- *
- * Tests that PGHOST does not point to a non-local server
- */
- void
- check_pghost_envvar(void)
- {
- PQconninfoOption *option;
- PQconninfoOption *start;
- /* Get valid libpq env vars from the PQconndefaults function */
- start = PQconndefaults();
- if (!start)
- pg_fatal("out of memory\n");
- for (option = start; option->keyword != NULL; option++)
- {
- if (option->envvar && (strcmp(option->envvar, "PGHOST") == 0 ||
- strcmp(option->envvar, "PGHOSTADDR") == 0))
- {
- const char *value = getenv(option->envvar);
- if (value && strlen(value) > 0 &&
- /* check for 'local' host values */
- (strcmp(value, "localhost") != 0 && strcmp(value, "127.0.0.1") != 0 &&
- strcmp(value, "::1") != 0 && value[0] != '/'))
- pg_fatal("libpq environment variable %s has a non-local server value: %s\n",
- option->envvar, value);
- }
- }
- /* Free the memory that libpq allocated on our behalf */
- PQconninfoFree(start);
- }