postgresql/contrib/pg_upgrade/server.c
2012-10-10 13:53:03 -04:00

312 lines
7.9 KiB
C

/*
* 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, using named database + standard params for cluster
*/
static PGconn *
get_db_conn(ClusterInfo *cluster, const char *db_name)
{
char conn_opts[2 * NAMEDATALEN + MAXPGPATH + 100];
if (cluster->sockdir)
snprintf(conn_opts, sizeof(conn_opts),
"dbname = '%s' user = '%s' host = '%s' port = %d",
db_name, os_info.user, cluster->sockdir, cluster->port);
else
snprintf(conn_opts, sizeof(conn_opts),
"dbname = '%s' user = '%s' port = %d",
db_name, os_info.user, cluster->port);
return PQconnectdb(conn_opts);
}
/*
* 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.
*
* Note result is in static storage, so use it right away.
*/
char *
cluster_conn_opts(ClusterInfo *cluster)
{
static char conn_opts[MAXPGPATH + NAMEDATALEN + 100];
if (cluster->sockdir)
snprintf(conn_opts, sizeof(conn_opts),
"--host \"%s\" --port %d --username \"%s\"",
cluster->sockdir, cluster->port, os_info.user);
else
snprintf(conn_opts, sizeof(conn_opts),
"--port %d --username \"%s\"",
cluster->port, os_info.user);
return 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)
pg_log(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", &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 * 4 + 1000];
PGconn *conn;
bool exit_hook_registered = false;
bool pg_ctl_return = false;
char socket_string[MAXPGPATH + 200];
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
/*
* 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),
"\"%s/pg_ctl\" -w -l \"%s\" -D \"%s\" -o \"-p %d %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->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,
false,
"%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:\n"
"%s\n",
CLUSTER_NAME(cluster), cmd);
}
PQfinish(conn);
/* If the connection didn't fail, fail now */
if (!pg_ctl_return)
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)
{
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, !fast,
"\"%s/pg_ctl\" -w -D \"%s\" -o \"%s\" %s stop",
cluster->bindir, cluster->pgconfig,
cluster->pgopts ? cluster->pgopts : "",
fast ? "-m fast" : "");
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);
}