void
start_postmaster(ClusterInfo *cluster)
{
char cmd[MAXPGPATH];
PGconn *conn;
bool exit_hook_registered = false;
int pg_ctl_return = 0;
if (!exit_hook_registered)
{
#ifdef HAVE_ATEXIT
atexit(stop_postmaster_atexit);
#else
on_exit(stop_postmaster_on_exit);
#endif
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\" start >> \"%s\" 2>&1" SYSTEMQUOTE,
cluster->bindir, log_opts.filename2, cluster->pgdata, cluster->port,
(cluster->controldata.cat_ver >=
BINARY_UPGRADE_SERVER_FLAG_CAT_VER) ? "-b" :
"-c autovacuum=off -c autovacuum_freeze_max_age=2000000000",
log_opts.filename2);
/*
* 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, "%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\n",
CLUSTER_NAME(cluster));
os_info.running_cluster = cluster;
}
int PlatDbAccess::exec_trans(const vector<string>& sqls, int & last_insert_id
, int & affected_rows, unsigned int uin)
{
int index = get_conn_index(uin);
ACE_Guard<ACE_Thread_Mutex> guard(db_conn_lock_[index]);
// 标识是否在使用 如果不使用了 请注意清理
db_conn_flag_[index] = 1;
ACE_DEBUG((LM_TRACE, "[%D] PlatDbAccess exec_trans sql vec size=%d,conn index=%d\n", sqls.size(), index));
PlatDbConn* db_conn = get_db_conn(index);
if (db_conn == NULL)
{
ACE_DEBUG((LM_ERROR, "[%D] PlatDbAccess get db conn failed\n"));
db_conn_flag_[index] = 0;
return -1;
}
int ret = 0;
ret = db_conn->exec_trans(sqls, last_insert_id, affected_rows);
if (ret != 0)
{
ACE_DEBUG((LM_ERROR, "[%D] PlatDbAccess exec_trans failed,%s\n", db_conn->get_err_msg() ));
if(ret == -1) // -1 表示服务器连接断开
{
ret = db_conn->exec_trans(sqls, last_insert_id, affected_rows);
if(ret == -1) //重连还失败，清理这个连接对象
{
fini(index);
}
}
}
db_conn_flag_[index] = 0;
return stat_return(ret);
}
/*
* 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;
}
/*
* 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;
}
//使用的时候连接状态db_conn_flag_ 设置为 1 使用完设置为 0
//线程和连接绑定的时候不受此变量影响
int PlatDbAccess::exec_update(const char* sql, int& last_insert_id
, int& affected_rows, unsigned int uin)
{
int index = get_conn_index(uin);
ACE_Guard<ACE_Thread_Mutex> guard(db_conn_lock_[index]);
// 标识是否在使用 如果不使用了 请注意清理
db_conn_flag_[index] = 1;
ACE_DEBUG((LM_TRACE, "[%D] PlatDbAccess exec update sql=%s,conn index=%d\n", sql, index));
PlatDbConn* db_conn = get_db_conn(index);
if (db_conn == NULL)
{
ACE_DEBUG((LM_ERROR, "[%D] PlatDbAccess get db conn failed\n"));
db_conn_flag_[index] = 0;
return -1;
}
int ret = 0;
ret = db_conn->exec_update(sql, last_insert_id, affected_rows);
if (ret != 0)
{
ACE_DEBUG((LM_ERROR, "[%D] PlatDbAccess exec update failed,ret=%d,%s,try again\n"
, ret, db_conn->get_err_msg() ));
if(ret == -1) // -1 表示服务器连接断开，尝试重连 try again
{
ret = db_conn->exec_update(sql, last_insert_id, affected_rows);
if(ret == -1) //重连还失败，清理这个连接对象
{
fini(index);
}
}
}
db_conn_flag_[index] = 0;
return stat_return(ret);
}
int PlatDbAccess::exec_multi_query(const char* sql, vector<MYSQL_RES*>& result_set_list
, unsigned int uin)
{
int index = get_conn_index(uin);
ACE_Guard<ACE_Thread_Mutex> guard(db_conn_lock_[index]);
// 标识是否在使用 如果不使用了 请注意清理
db_conn_flag_[index] = 1; // 1表示正在使用
ACE_DEBUG(( LM_TRACE, "[%D] PlatDbAccess exec query sql=%s\n", sql ));
PlatDbConn* db_conn = get_db_conn(index);
if (db_conn == NULL)
{
ACE_DEBUG((LM_ERROR, "[%D] PlatDbAccess get db conn failed\n"));
db_conn_flag_[index] = 0;
return -1;
}
int ret = 0;
ret = db_conn->exec_multi_query(sql, result_set_list);
if (ret != 0)
{
ACE_DEBUG((LM_ERROR, "[%D] PlatDbAccess exec query failed,idx=%d,%s\n"
, index, db_conn->get_err_msg() ));
if(ret == -1) // -1 表示服务器连接断开，尝试重连 try again
{
ret = db_conn->exec_multi_query(sql, result_set_list);
if(ret == -1) //重连还失败，清理这个连接对象
{
fini(index);
}
}
}
db_conn_flag_[index] = 0;
return stat_return(ret);
}
bool
start_postmaster(ClusterInfo *cluster, bool throw_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,
false,
"%s", cmd);
/* Did it fail and we are just testing if the server could be started? */
if (!pg_ctl_return && !throw_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\n",
PQerrorMessage(conn));
if (conn)
PQfinish(conn);
pg_fatal("could not connect to %s postmaster started with the command:\n"
"%s\n",
CLUSTER_NAME(cluster), cmd);
}
PQfinish(conn);
/*
* If pg_ctl failed, and the connection didn't fail, and throw_error is
* enabled, fail now. This could happen if the server was already
* running.
*/
if (!pg_ctl_return)
pg_fatal("pg_ctl failed to start the %s server, or connection failed\n",
CLUSTER_NAME(cluster));
return 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;
}
