/*
* server.c
*
* database server functions
*
* Copyright (c) 2010-2012, PostgreSQL Global Development Group
* contrib/pg_upgrade/server.c
*/
#include "postgres.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\n",
PQerrorMessage(conn));
if (conn)
PQfinish(conn);
printf("Failure, exiting\n");
exit(1);
}
return conn;
}
/*
* get_db_conn()
*
* get database connection
*/
static PGconn *
get_db_conn(ClusterInfo *cluster, const char *db_name)
{
char conn_opts[MAXPGPATH];
snprintf(conn_opts, sizeof(conn_opts),
"dbname = '%s' user = '%s' port = %d", db_name, os_info.user,
cluster->port);
return PQconnectdb(conn_opts);
}
/*
* 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 command[8192];
va_list args;
PGresult *result;
ExecStatusType status;
va_start(args, fmt);
vsnprintf(command, sizeof(command), fmt, args);
va_end(args);
pg_log(PG_VERBOSE, "executing: %s\n", command);
result = PQexec(conn, command);
status = PQresultStatus(result);
if ((status != PGRES_TUPLES_OK) && (status != PGRES_COMMAND_OK))
{
pg_log(PG_REPORT, "SQL command failed\n%s\n%s\n", command,
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 integer_version = 0;
int fractional_version = 0;
snprintf(ver_filename, sizeof(ver_filename), "%s/PG_VERSION",
cluster->pgdata);
if ((version_fd = fopen(ver_filename, "r")) == NULL)
return 0;
if (fscanf(version_fd, "%63s", cluster->major_version_str) == 0 ||
sscanf(cluster->major_version_str, "%d.%d", &integer_version,
&fractional_version) != 2)
pg_log(PG_FATAL, "could not get version from %s\n", cluster->pgdata);
fclose(version_fd);
return (100 * integer_version + fractional_version) * 100;
}
static void
stop_postmaster_atexit(void)
{
stop_postmaster(true);
}
void
start_postmaster(ClusterInfo *cluster)
{
char cmd[MAXPGPATH];
PGconn *conn;
bool exit_hook_registered = false;
int pg_ctl_return = 0;
if (!exit_hook_registered)
{
atexit(stop_postmaster_atexit);
exit_hook_registered = true;
}
/*
* Using autovacuum=off disables cleanup vacuum and analyze, but freeze
* vacuums can still happen, so we set autovacuum_freeze_max_age to its
* maximum. We assume all datfrozenxid and relfrozen values are less than
* a gap of 2000000000 from the current xid counter, so autovacuum will
* not touch them.
*/
snprintf(cmd, sizeof(cmd),
SYSTEMQUOTE "\"%s/pg_ctl\" -w -l \"%s\" -D \"%s\" "
"-o \"-p %d %s %s\" start >> \"%s\" 2>&1" SYSTEMQUOTE,
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->pgopts ? cluster->pgopts : "", SERVER_START_LOG_FILE);
/*
* 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(false, true, SERVER_START_LOG_FILE,
/* pass both file names if the differ */
(strcmp(SERVER_LOG_FILE, SERVER_START_LOG_FILE) != 0) ?
SERVER_LOG_FILE : NULL,
"%s", cmd);
/* Check to see if we can connect to the server; if not, report it. */
if ((conn = get_db_conn(cluster, "template1")) == NULL ||
PQstatus(conn) != CONNECTION_OK)
{
pg_log(PG_REPORT, "\nconnection to database failed: %s\n",
PQerrorMessage(conn));
if (conn)
PQfinish(conn);
pg_log(PG_FATAL, "could not connect to %s postmaster started with the command: %s\n",
CLUSTER_NAME(cluster), cmd);
}
PQfinish(conn);
/* If the connection didn't fail, fail now */
if (pg_ctl_return != 0)
pg_log(PG_FATAL, "pg_ctl failed to start the %s server, or connection failed\n",
CLUSTER_NAME(cluster));
os_info.running_cluster = cluster;
}
void
stop_postmaster(bool fast)
{
char cmd[MAXPGPATH];
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 */
snprintf(cmd, sizeof(cmd),
SYSTEMQUOTE "\"%s/pg_ctl\" -w -D \"%s\" -o \"%s\" "
"%s stop >> \"%s\" 2>&1" SYSTEMQUOTE,
cluster->bindir, cluster->pgconfig,
cluster->pgopts ? cluster->pgopts : "",
fast ? "-m fast" : "", SERVER_STOP_LOG_FILE);
exec_prog(fast ? false : true, true, SERVER_STOP_LOG_FILE, NULL, "%s", cmd);
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();
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_log(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);
}