granicus.if.org Git - postgresql/blob - contrib/pg_upgrade/server.c

   1 /*
   2  *      server.c
   3  *
   4  *      database server functions
   5  *
   6  *      Copyright (c) 2010-2012, PostgreSQL Global Development Group
   7  *      contrib/pg_upgrade/server.c
   8  */
   9
  10 #include "postgres.h"
  11
  12 #include "pg_upgrade.h"
  13
  14
  15 static PGconn *get_db_conn(ClusterInfo *cluster, const char *db_name);
  16
  17
  18 /*
  19  * connectToServer()
  20  *
  21  *      Connects to the desired database on the designated server.
  22  *      If the connection attempt fails, this function logs an error
  23  *      message and calls exit() to kill the program.
  24  */
  25 PGconn *
  26 connectToServer(ClusterInfo *cluster, const char *db_name)
  27 {
  28         PGconn     *conn = get_db_conn(cluster, db_name);
  29
  30         if (conn == NULL || PQstatus(conn) != CONNECTION_OK)
  31         {
  32                 pg_log(PG_REPORT, "connection to database failed: %s\n",
  33                            PQerrorMessage(conn));
  34
  35                 if (conn)
  36                         PQfinish(conn);
  37
  38                 printf("Failure, exiting\n");
  39                 exit(1);
  40         }
  41
  42         return conn;
  43 }
  44
  45
  46 /*
  47  * get_db_conn()
  48  *
  49  * get database connection
  50  */
  51 static PGconn *
  52 get_db_conn(ClusterInfo *cluster, const char *db_name)
  53 {
  54         char            conn_opts[MAXPGPATH];
  55
  56         snprintf(conn_opts, sizeof(conn_opts),
  57                          "dbname = '%s' user = '%s' port = %d", db_name, os_info.user,
  58                          cluster->port);
  59
  60         return PQconnectdb(conn_opts);
  61 }
  62
  63
  64 /*
  65  * executeQueryOrDie()
  66  *
  67  *      Formats a query string from the given arguments and executes the
  68  *      resulting query.  If the query fails, this function logs an error
  69  *      message and calls exit() to kill the program.
  70  */
  71 PGresult *
  72 executeQueryOrDie(PGconn *conn, const char *fmt,...)
  73 {
  74         static char command[8192];
  75         va_list         args;
  76         PGresult   *result;
  77         ExecStatusType status;
  78
  79         va_start(args, fmt);
  80         vsnprintf(command, sizeof(command), fmt, args);
  81         va_end(args);
  82
  83         pg_log(PG_VERBOSE, "executing: %s\n", command);
  84         result = PQexec(conn, command);
  85         status = PQresultStatus(result);
  86
  87         if ((status != PGRES_TUPLES_OK) && (status != PGRES_COMMAND_OK))
  88         {
  89                 pg_log(PG_REPORT, "SQL command failed\n%s\n%s\n", command,
  90                            PQerrorMessage(conn));
  91                 PQclear(result);
  92                 PQfinish(conn);
  93                 printf("Failure, exiting\n");
  94                 exit(1);
  95         }
  96         else
  97                 return result;
  98 }
  99
 100
 101 /*
 102  * get_major_server_version()
 103  *
 104  * gets the version (in unsigned int form) for the given datadir. Assumes
 105  * that datadir is an absolute path to a valid pgdata directory. The version
 106  * is retrieved by reading the PG_VERSION file.
 107  */
 108 uint32
 109 get_major_server_version(ClusterInfo *cluster)
 110 {
 111         FILE       *version_fd;
 112         char            ver_filename[MAXPGPATH];
 113         int                     integer_version = 0;
 114         int                     fractional_version = 0;
 115
 116         snprintf(ver_filename, sizeof(ver_filename), "%s/PG_VERSION",
 117                          cluster->pgdata);
 118         if ((version_fd = fopen(ver_filename, "r")) == NULL)
 119                 return 0;
 120
 121         if (fscanf(version_fd, "%63s", cluster->major_version_str) == 0 ||
 122                 sscanf(cluster->major_version_str, "%d.%d", &integer_version,
 123                            &fractional_version) != 2)
 124                 pg_log(PG_FATAL, "could not get version from %s\n", cluster->pgdata);
 125
 126         fclose(version_fd);
 127
 128         return (100 * integer_version + fractional_version) * 100;
 129 }
 130
 131
 132 static void
 133 stop_postmaster_atexit(void)
 134 {
 135         stop_postmaster(true);
 136
 137 }
 138
 139
 140 void
 141 start_postmaster(ClusterInfo *cluster)
 142 {
 143         char            cmd[MAXPGPATH];
 144         PGconn     *conn;
 145         bool            exit_hook_registered = false;
 146         int                     pg_ctl_return = 0;
 147
 148         if (!exit_hook_registered)
 149         {
 150                 atexit(stop_postmaster_atexit);
 151                 exit_hook_registered = true;
 152         }
 153
 154         /*
 155          * Using autovacuum=off disables cleanup vacuum and analyze, but freeze
 156          * vacuums can still happen, so we set autovacuum_freeze_max_age to its
 157          * maximum.  We assume all datfrozenxid and relfrozen values are less than
 158          * a gap of 2000000000 from the current xid counter, so autovacuum will
 159          * not touch them.
 160          */
 161         snprintf(cmd, sizeof(cmd),
 162                          SYSTEMQUOTE "\"%s/pg_ctl\" -w -l \"%s\" -D \"%s\" "
 163                          "-o \"-p %d %s %s\" start >> \"%s\" 2>&1" SYSTEMQUOTE,
 164                          cluster->bindir, SERVER_LOG_FILE, cluster->pgconfig, cluster->port,
 165                          (cluster->controldata.cat_ver >=
 166                           BINARY_UPGRADE_SERVER_FLAG_CAT_VER) ? "-b" :
 167                          "-c autovacuum=off -c autovacuum_freeze_max_age=2000000000",
 168                          cluster->pgopts ? cluster->pgopts : "", SERVER_START_LOG_FILE);
 169
 170         /*
 171          * Don't throw an error right away, let connecting throw the error because
 172          * it might supply a reason for the failure.
 173          */
 174         pg_ctl_return = exec_prog(false, true,
 175                                         /* pass both file names if the differ */
 176                                         (strcmp(SERVER_LOG_FILE, SERVER_START_LOG_FILE) == 0) ?
 177                                                 SERVER_LOG_FILE :
 178                                                 SERVER_LOG_FILE " or " SERVER_START_LOG_FILE,
 179                                         "%s", cmd);
 180
 181         /* Check to see if we can connect to the server; if not, report it. */
 182         if ((conn = get_db_conn(cluster, "template1")) == NULL ||
 183                 PQstatus(conn) != CONNECTION_OK)
 184         {
 185                 pg_log(PG_REPORT, "\nconnection to database failed: %s\n",
 186                            PQerrorMessage(conn));
 187                 if (conn)
 188                         PQfinish(conn);
 189                 pg_log(PG_FATAL, "could not connect to %s postmaster started with the command: %s\n",
 190                            CLUSTER_NAME(cluster), cmd);
 191         }
 192         PQfinish(conn);
 193
 194         /* If the connection didn't fail, fail now */
 195         if (pg_ctl_return != 0)
 196                 pg_log(PG_FATAL, "pg_ctl failed to start the %s server\n",
 197                            CLUSTER_NAME(cluster));
 198
 199         os_info.running_cluster = cluster;
 200 }
 201
 202
 203 void
 204 stop_postmaster(bool fast)
 205 {
 206         char            cmd[MAXPGPATH];
 207         ClusterInfo *cluster;
 208
 209         if (os_info.running_cluster == &old_cluster)
 210                 cluster = &old_cluster;
 211         else if (os_info.running_cluster == &new_cluster)
 212                 cluster = &new_cluster;
 213         else
 214                 return;         /* no cluster running */
 215
 216         snprintf(cmd, sizeof(cmd),
 217                          SYSTEMQUOTE "\"%s/pg_ctl\" -w -D \"%s\" -o \"%s\" "
 218                          "%s stop >> \"%s\" 2>&1" SYSTEMQUOTE,
 219                          cluster->bindir, cluster->pgconfig,
 220                          cluster->pgopts ? cluster->pgopts : "",
 221                         fast ? "-m fast" : "", SERVER_STOP_LOG_FILE);
 222
 223         exec_prog(fast ? false : true, true, SERVER_STOP_LOG_FILE, "%s", cmd);
 224
 225         os_info.running_cluster = NULL;
 226 }
 227
 228
 229 /*
 230  * check_pghost_envvar()
 231  *
 232  * Tests that PGHOST does not point to a non-local server
 233  */
 234 void
 235 check_pghost_envvar(void)
 236 {
 237         PQconninfoOption *option;
 238         PQconninfoOption *start;
 239
 240         /* Get valid libpq env vars from the PQconndefaults function */
 241
 242         start = PQconndefaults();
 243
 244         for (option = start; option->keyword != NULL; option++)
 245         {
 246                 if (option->envvar && (strcmp(option->envvar, "PGHOST") == 0 ||
 247                                                            strcmp(option->envvar, "PGHOSTADDR") == 0))
 248                 {
 249                         const char *value = getenv(option->envvar);
 250
 251                         if (value && strlen(value) > 0 &&
 252                         /* check for 'local' host values */
 253                                 (strcmp(value, "localhost") != 0 && strcmp(value, "127.0.0.1") != 0 &&
 254                                  strcmp(value, "::1") != 0 && value[0] != '/'))
 255                                 pg_log(PG_FATAL,
 256                                            "libpq environment variable %s has a non-local server value: %s\n",
 257                                            option->envvar, value);
 258                 }
 259         }
 260
 261         /* Free the memory that libpq allocated on our behalf */
 262         PQconninfoFree(start);
 263 }