/* ----------
* get_earliest_xid()
*
* reads the earliest XID that is still active.
*
* The idea is that if, between cleanupThread iterations, this XID has
* not changed, then an old transaction is still in progress,
* PostgreSQL is holding onto the tuples, and there is no value in
* doing VACUUMs of the various Slony-I tables.
* ----------
*/
static unsigned long
get_earliest_xid(PGconn *dbconn)
{
int64 xid;
PGresult *res;
SlonDString query;
dstring_init(&query);
(void) slon_mkquery(&query, "select pg_catalog.txid_snapshot_xmin(pg_catalog.txid_current_snapshot());");
res = PQexec(dbconn, dstring_data(&query));
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
slon_log(SLON_FATAL, "cleanupThread: could not txid_snapshot_xmin()!\n");
PQclear(res);
slon_retry();
return (unsigned long) -1;
}
xid = strtoll(PQgetvalue(res, 0, 0), NULL, 10);
slon_log(SLON_DEBUG1, "cleanupThread: minxid: %d\n", xid);
PQclear(res);
dstring_free(&query);
return (unsigned long) xid;
}
/* ----------
* slon_localListenThread
*
* Listen for events on the local database connection. This means,
* events generated by the local node only.
* ----------
*/
void *
localListenThread_main(/* @unused@ */ void *dummy)
{
SlonConn *conn;
SlonDString query1;
PGconn *dbconn;
PGresult *res;
int ntuples;
int tupno;
PGnotify *notification;
char restart_notify[256];
int restart_request;
int poll_sleep = 0;
int node_lock_obtained=0;
slon_log(SLON_INFO, "localListenThread: thread starts\n");
/*
* Connect to the local database
*/
if ((conn = slon_connectdb(rtcfg_conninfo, "local_listen")) == NULL)
slon_retry();
dbconn = conn->dbconn;
/*
* Initialize local data
*/
dstring_init(&query1);
sprintf(restart_notify, "_%s_Restart", rtcfg_cluster_name);
/*
* Listen for local events
*/
(void) slon_mkquery(&query1,
"listen \"_%s_Restart\"; ",
rtcfg_cluster_name);
res = PQexec(dbconn, dstring_data(&query1));
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
slon_log(SLON_FATAL,
"localListenThread: \"%s\" - %s\n",
dstring_data(&query1), PQresultErrorMessage(res));
PQclear(res);
dstring_free(&query1);
pthread_mutex_lock(&slon_wait_listen_lock);
slon_listen_started=0;
pthread_cond_signal(&slon_wait_listen_cond);
pthread_mutex_unlock(&slon_wait_listen_lock);
slon_retry();
}
PQclear(res);
/*
* Check that we are the only slon daemon connected.
*/
#define NODELOCKERROR "ERROR: duplicate key violates unique constraint \"sl_nodelock-pkey\""
(void) slon_mkquery(&query1,
"select %s.cleanupNodelock(); "
"insert into %s.sl_nodelock values ("
" %d, 0, \"pg_catalog\".pg_backend_pid()); ",
rtcfg_namespace, rtcfg_namespace,
rtcfg_nodeid);
while(!node_lock_obtained)
{
res = PQexec(dbconn, dstring_data(&query1));
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
slon_log(SLON_FATAL,
"localListenThread: \"%s\" - %s\n",
dstring_data(&query1), PQresultErrorMessage(res));
if (strncmp(NODELOCKERROR, PQresultErrorMessage(res), strlen(NODELOCKERROR)) == 0) {
slon_log(SLON_FATAL,
"Do you already have a slon running against this node?\n");
slon_log(SLON_FATAL,
"Or perhaps a residual idle backend connection from a dead slon?\n");
PQclear(res);
if(worker_restarted)
{
sleep(5);
continue;
}
else
{
dstring_free(&query1);
pthread_mutex_lock(&slon_wait_listen_lock);
slon_listen_started=0;
pthread_cond_signal(&slon_wait_listen_cond);
pthread_mutex_unlock(&slon_wait_listen_lock);
slon_abort();
}
}
PQclear(res);
dstring_free(&query1);
slon_abort();
}
PQclear(res);
node_lock_obtained=1;
}
/*
* Flag the main thread that the coast is clear and he can launch all
* other threads.
*/
pthread_mutex_lock(&slon_wait_listen_lock);
slon_listen_started=1;
pthread_cond_signal(&slon_wait_listen_cond);
pthread_mutex_unlock(&slon_wait_listen_lock);
/*
* Process all events, then wait for notification and repeat until
* shutdown time has arrived.
*/
while (true)
{
/*
* Start the transaction
*/
res = PQexec(dbconn, "start transaction; "
"set transaction isolation level serializable;");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
slon_log(SLON_FATAL,
"localListenThread: cannot start transaction - %s\n",
PQresultErrorMessage(res));
PQclear(res);
dstring_free(&query1);
slon_retry();
break;
}
PQclear(res);
/*
* Drain notifications.
*/
(void) PQconsumeInput(dbconn);
restart_request = false;
while ((notification = PQnotifies(dbconn)) != NULL)
{
if (strcmp(restart_notify, notification->relname) == 0)
restart_request = true;
(void) PQfreemem(notification);
}
if (restart_request)
{
slon_log(SLON_INFO,
"localListenThread: got restart notification\n");
#ifndef WIN32
slon_restart();
#else
/* XXX */
/* Win32 defer to service manager to restart for now */
slon_restart();
#endif
}
/*
* Query the database for new local events
*/
(void) slon_mkquery(&query1,
"select ev_seqno, ev_timestamp, "
" 'dummy', 'dummy', 'dummy', "
" ev_type, "
" ev_data1, ev_data2, ev_data3, ev_data4, "
" ev_data5, ev_data6, ev_data7, ev_data8 "
"from %s.sl_event "
"where ev_origin = '%d' "
" and ev_seqno > '%s' "
"order by ev_seqno",
rtcfg_namespace, rtcfg_nodeid, rtcfg_lastevent);
res = PQexec(dbconn, dstring_data(&query1));
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
slon_log(SLON_FATAL,
"localListenThread: \"%s\" - %s\n",
dstring_data(&query1), PQresultErrorMessage(res));
PQclear(res);
dstring_free(&query1);
slon_retry();
break;
}
ntuples = PQntuples(res);
for (tupno = 0; tupno < ntuples; tupno++)
{
char *ev_type;
/*
* Remember the event sequence number for confirmation
*/
strcpy(rtcfg_lastevent, PQgetvalue(res, tupno, 0));
/*
* Get the event type and process configuration events
*/
ev_type = PQgetvalue(res, tupno, 5);
slon_log(SLON_DEBUG2, "localListenThread: "
"Received event %d,%s %s\n",
rtcfg_nodeid, PQgetvalue(res, tupno, 0),
ev_type);
if (strcmp(ev_type, "SYNC") == 0)
{
/*
* SYNC - nothing to do
*/
}
else if (strcmp(ev_type, "STORE_NODE") == 0)
{
/*
* STORE_NODE
*/
int no_id;
char *no_comment;
no_id = (int)strtol(PQgetvalue(res, tupno, 6), NULL, 10);
no_comment = PQgetvalue(res, tupno, 7);
if (no_id != rtcfg_nodeid)
rtcfg_storeNode(no_id, no_comment);
rtcfg_reloadListen(dbconn);
}
else if (strcmp(ev_type, "ENABLE_NODE") == 0)
{
/*
* ENABLE_NODE
*/
int no_id;
no_id = (int)strtol(PQgetvalue(res, tupno, 6), NULL, 10);
if (no_id != rtcfg_nodeid)
rtcfg_enableNode(no_id);
rtcfg_reloadListen(dbconn);
}
else if (strcmp(ev_type, "DROP_NODE") == 0)
{
/*
* DROP_NODE
*/
int no_id;
char notify_query[256];
PGresult *notify_res;
no_id = (int)strtol(PQgetvalue(res, tupno, 6), NULL, 10);
/*
* Deactivate the node in the runtime configuration
*/
rtcfg_disableNode(no_id);
/*
* And cause the replication daemon to restart to get rid of
* it.
*/
snprintf(notify_query, sizeof(notify_query),
"notify \"_%s_Restart\";",
rtcfg_cluster_name);
notify_res = PQexec(dbconn, notify_query);
if (PQresultStatus(notify_res) != PGRES_COMMAND_OK)
{
slon_log(SLON_FATAL, "localListenThread: \"%s\" %s\n",
notify_query, PQresultErrorMessage(notify_res));
PQclear(notify_res);
slon_restart();
}
PQclear(notify_res);
rtcfg_reloadListen(dbconn);
}
else if (strcmp(ev_type, "CLONE_NODE") == 0)
{
/*
* CLONE_NODE
*/
int no_id;
int no_provider;
char *no_comment;
no_id = (int)strtol(PQgetvalue(res, tupno, 6), NULL, 10);
no_provider = (int)strtol(PQgetvalue(res, tupno, 7), NULL, 10);
no_comment = PQgetvalue(res, tupno, 8);
rtcfg_storeNode(no_id, no_comment);
}
else if (strcmp(ev_type, "STORE_PATH") == 0)
{
/*
* STORE_PATH
*/
int pa_server;
int pa_client;
char *pa_conninfo;
int pa_connretry;
pa_server = (int)strtol(PQgetvalue(res, tupno, 6), NULL, 10);
pa_client = (int)strtol(PQgetvalue(res, tupno, 7), NULL, 10);
pa_conninfo = PQgetvalue(res, tupno, 8);
pa_connretry = (int)strtol(PQgetvalue(res, tupno, 9), NULL, 10);
if (pa_client == rtcfg_nodeid)
rtcfg_storePath(pa_server, pa_conninfo, pa_connretry);
rtcfg_reloadListen(dbconn);
}
else if (strcmp(ev_type, "DROP_PATH") == 0)
{
/*
* DROP_PATH
*/
int pa_server;
int pa_client;
pa_server = (int)strtol(PQgetvalue(res, tupno, 6), NULL, 10);
pa_client = (int)strtol(PQgetvalue(res, tupno, 7), NULL, 10);
if (pa_client == rtcfg_nodeid)
rtcfg_dropPath(pa_server);
rtcfg_reloadListen(dbconn);
}
else if (strcmp(ev_type, "STORE_LISTEN") == 0)
{
/*
* STORE_LISTEN
*/
int li_origin;
int li_provider;
int li_receiver;
li_origin = (int)strtol(PQgetvalue(res, tupno, 6), NULL, 10);
li_provider = (int)strtol(PQgetvalue(res, tupno, 7), NULL, 10);
li_receiver = (int)strtol(PQgetvalue(res, tupno, 8), NULL, 10);
if (li_receiver == rtcfg_nodeid)
rtcfg_storeListen(li_origin, li_provider);
}
else if (strcmp(ev_type, "DROP_LISTEN") == 0)
{
/*
* DROP_LISTEN
*/
int li_origin;
int li_provider;
int li_receiver;
li_origin = (int)strtol(PQgetvalue(res, tupno, 6), NULL, 10);
li_provider = (int)strtol(PQgetvalue(res, tupno, 7), NULL, 10);
li_receiver = (int)strtol(PQgetvalue(res, tupno, 8), NULL, 10);
if (li_receiver == rtcfg_nodeid)
rtcfg_dropListen(li_origin, li_provider);
}
else if (strcmp(ev_type, "STORE_SET") == 0)
{
/*
* STORE_SET
*/
int set_id;
int set_origin;
char *set_comment;
set_id = (int)strtol(PQgetvalue(res, tupno, 6), NULL, 10);
set_origin = (int)strtol(PQgetvalue(res, tupno, 7), NULL, 10);
set_comment = PQgetvalue(res, tupno, 8);
rtcfg_storeSet(set_id, set_origin, set_comment);
}
else if (strcmp(ev_type, "DROP_SET") == 0)
{
/*
* DROP_SET
*/
int set_id;
set_id = (int)strtol(PQgetvalue(res, tupno, 6), NULL, 10);
rtcfg_dropSet(set_id);
}
else if (strcmp(ev_type, "MERGE_SET") == 0)
{
/*
* MERGE_SET
*/
int set_id;
int add_id;
set_id = (int)strtol(PQgetvalue(res, tupno, 6), NULL, 10);
add_id = (int)strtol(PQgetvalue(res, tupno, 7), NULL, 10);
rtcfg_dropSet(add_id);
}
else if (strcmp(ev_type, "SET_ADD_TABLE") == 0)
{
/*
* SET_ADD_TABLE
*/
/*
* Nothing to do ATM ... we don't support adding tables to
* subscribed sets and table information is not maintained in
* the runtime configuration.
*/
}
else if (strcmp(ev_type, "SET_ADD_SEQUENCE") == 0)
{
/*
* SET_ADD_SEQUENCE
*/
/*
* Nothing to do ATM ... we don't support adding sequences to
* subscribed sets and table information is not maintained in
* the runtime configuration.
*/
}
else if (strcmp(ev_type, "SET_DROP_TABLE") == 0)
{
/*
* SET_DROP_TABLE
*/
/*
* Nothing to do ATM ... table information is not maintained
* in the runtime configuration.
*/
}
else if (strcmp(ev_type, "SET_DROP_SEQUENCE") == 0)
{
/*
* SET_DROP_SEQUENCE
*/
/*
* Nothing to do ATM ... table information is not maintained
* in the runtime configuration.
*/
}
else if (strcmp(ev_type, "SET_MOVE_TABLE") == 0)
{
/*
* SET_MOVE_TABLE
*/
/*
* Nothing to do ATM ... table information is not maintained
* in the runtime configuration.
*/
}
else if (strcmp(ev_type, "SET_MOVE_SEQUENCE") == 0)
{
/*
* SET_MOVE_SEQUENCE
*/
/*
* Nothing to do ATM ... table information is not maintained
* in the runtime configuration.
*/
}
else if (strcmp(ev_type, "ADJUST_SEQ") == 0)
{
/*
* ADJUST_SEQ
*/
}
else if (strcmp(ev_type, "STORE_TRIGGER") == 0)
{
/*
* STORE_TRIGGER
*/
/*
* Nothing to do ATM
*/
}
else if (strcmp(ev_type, "DROP_TRIGGER") == 0)
{
/*
* DROP_TRIGGER
*/
/*
* Nothing to do ATM
*/
}
else if (strcmp(ev_type, "MOVE_SET") == 0)
{
/*
* MOVE_SET
*/
int set_id;
int old_origin;
int new_origin;
PGresult *res2;
SlonDString query2;
int sub_provider;
set_id = (int)strtol(PQgetvalue(res, tupno, 6), NULL, 10);
old_origin = (int)strtol(PQgetvalue(res, tupno, 7), NULL, 10);
new_origin = (int)strtol(PQgetvalue(res, tupno, 8), NULL, 10);
/*
* We have been the old origin of the set, so according to the
* rules we must have a provider now.
*/
dstring_init(&query2);
(void) slon_mkquery(&query2,
"select sub_provider from %s.sl_subscribe "
" where sub_receiver = %d and sub_set = %d",
rtcfg_namespace, rtcfg_nodeid, set_id);
res2 = PQexec(dbconn, dstring_data(&query2));
if (PQresultStatus(res2) != PGRES_TUPLES_OK)
{
slon_log(SLON_FATAL, "localListenThread: \"%s\" %s\n",
dstring_data(&query2),
PQresultErrorMessage(res2));
dstring_free(&query2);
PQclear(res2);
slon_retry();
}
if (PQntuples(res2) != 1)
{
slon_log(SLON_FATAL, "localListenThread: MOVE_SET "
"but no provider found for set %d\n",
set_id);
dstring_free(&query2);
PQclear(res2);
slon_retry();
}
sub_provider =
(int)strtol(PQgetvalue(res2, 0, 0), NULL, 10);
PQclear(res2);
dstring_free(&query2);
rtcfg_moveSet(set_id, old_origin, new_origin, sub_provider);
rtcfg_reloadListen(dbconn);
}
else if (strcmp(ev_type, "FAILOVER_SET") == 0)
{
/*
* FAILOVER_SET
*/
/*
* Nothing to do. The stored procedure will restart this
* daemon anyway.
*/
}
else if (strcmp(ev_type, "SUBSCRIBE_SET") == 0)
{
/*
* SUBSCRIBE_SET
*/
int sub_set;
int sub_provider;
int sub_receiver;
char *sub_forward;
sub_set = (int)strtol(PQgetvalue(res, tupno, 6), NULL, 10);
sub_provider = (int)strtol(PQgetvalue(res, tupno, 7), NULL, 10);
sub_receiver = (int)strtol(PQgetvalue(res, tupno, 8), NULL, 10);
sub_forward = PQgetvalue(res, tupno, 9);
if (sub_receiver == rtcfg_nodeid)
rtcfg_storeSubscribe(sub_set, sub_provider, sub_forward);
rtcfg_reloadListen(dbconn);
}
else if (strcmp(ev_type, "ENABLE_SUBSCRIPTION") == 0)
{
/*
* ENABLE_SUBSCRIPTION
*/
int sub_set;
int sub_provider;
int sub_receiver;
char *sub_forward;
sub_set = (int)strtol(PQgetvalue(res, tupno, 6), NULL, 10);
sub_provider = (int)strtol(PQgetvalue(res, tupno, 7), NULL, 10);
sub_receiver = (int)strtol(PQgetvalue(res, tupno, 8), NULL, 10);
sub_forward = PQgetvalue(res, tupno, 9);
if (sub_receiver == rtcfg_nodeid)
rtcfg_enableSubscription(sub_set, sub_provider, sub_forward);
rtcfg_reloadListen(dbconn);
}
else if (strcmp(ev_type, "UNSUBSCRIBE_SET") == 0)
{
/*
* UNSUBSCRIBE_SET
*/
int sub_set;
int sub_receiver;
sub_set = (int)strtol(PQgetvalue(res, tupno, 6), NULL, 10);
sub_receiver = (int)strtol(PQgetvalue(res, tupno, 7), NULL, 10);
if (sub_receiver == rtcfg_nodeid)
rtcfg_unsubscribeSet(sub_set);
rtcfg_reloadListen(dbconn);
}
else if (strcmp(ev_type, "DDL_SCRIPT") == 0)
{
/*
* DDL_SCRIPT
*/
/*
* Nothing to do ATM
*/
}
else if (strcmp(ev_type, "ACCEPT_SET") == 0)
{
/*
* ACCEPT_SET
*/
/*
* Nothing to do locally
*/
slon_log(SLON_DEBUG1, "localListenThread: ACCEPT_SET\n");
rtcfg_reloadListen(dbconn);
}
else
{
slon_log(SLON_FATAL,
"localListenThread: event %s: Unknown event type: %s\n",
rtcfg_lastevent, ev_type);
slon_abort();
}
}
PQclear(res);
/*
* If there were events, commit the transaction.
*/
if (ntuples > 0)
{
poll_sleep = 0; /* drop polling time back to 0... */
res = PQexec(dbconn, "commit transaction");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
slon_log(SLON_FATAL,
"localListenThread: \"%s\" - %s\n",
dstring_data(&query1), PQresultErrorMessage(res));
PQclear(res);
dstring_free(&query1);
slon_retry();
break;
}
PQclear(res);
}
else
{
/*
* No database events received. Rollback instead.
*/
/* Increase the amount of time to sleep, to a max of sync_interval_timeout */
poll_sleep += sync_interval;
if (poll_sleep > sync_interval_timeout) {
poll_sleep = sync_interval_timeout;
}
res = PQexec(dbconn, "rollback transaction;");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
slon_log(SLON_FATAL,
"localListenThread: \"rollback transaction;\" - %s\n",
PQresultErrorMessage(res));
PQclear(res);
slon_retry();
break;
}
PQclear(res);
}
/*
* Wait for notify or for timeout
*/
if (sched_wait_time(conn, SCHED_WAIT_SOCK_READ, poll_sleep) != SCHED_STATUS_OK)
break;
}
/*
* The scheduler asked us to shutdown. Free memory and close the DB
* connection.
*/
dstring_free(&query1);
slon_disconnectdb(conn);
#ifdef SLON_MEMDEBUG
conn = NULL;
#endif
slon_log(SLON_INFO, "localListenThread: thread done\n");
pthread_exit(NULL);
}
/* ----------
* SlonMain
* ----------
*/
static void
SlonMain(void)
{
PGresult *res;
SlonDString query;
int i,
n;
PGconn *startup_conn;
slon_pid = getpid();
#ifndef WIN32
slon_worker_pid = slon_pid;
#endif
if (pthread_mutex_init(&slon_wait_listen_lock, NULL) < 0)
{
slon_log(SLON_FATAL, "main: pthread_mutex_init() failed - %s\n",
strerror(errno));
slon_abort();
}
if (pthread_cond_init(&slon_wait_listen_cond, NULL) < 0)
{
slon_log(SLON_FATAL, "main: pthread_cond_init() failed - %s\n",
strerror(errno));
slon_abort();
}
/*
* Dump out current configuration - all elements of the various arrays...
*/
dump_configuration();
/*
* Connect to the local database to read the initial configuration
*/
startup_conn = PQconnectdb(rtcfg_conninfo);
if (startup_conn == NULL)
{
slon_log(SLON_FATAL, "main: PQconnectdb() failed - sleep 10s\n");
sleep(10);
slon_retry();
exit(-1);
}
if (PQstatus(startup_conn) != CONNECTION_OK)
{
slon_log(SLON_FATAL, "main: Cannot connect to local database - %s - sleep 10s\n",
PQerrorMessage(startup_conn));
PQfinish(startup_conn);
sleep(10);
slon_retry();
exit(-1);
}
/*
* Get our local node ID
*/
rtcfg_nodeid = db_getLocalNodeId(startup_conn);
if (rtcfg_nodeid < 0)
{
slon_log(SLON_FATAL, "main: Node is not initialized properly - sleep 10s\n");
sleep(10);
slon_retry();
exit(-1);
}
if (db_checkSchemaVersion(startup_conn) < 0)
{
slon_log(SLON_FATAL, "main: Node has wrong Slony-I schema or module version loaded\n");
slon_abort();
}
slon_log(SLON_CONFIG, "main: local node id = %d\n", rtcfg_nodeid);
dstring_init(&query);
slon_mkquery(&query, "select %s.slon_node_health_check();", rtcfg_namespace);
res = PQexec(startup_conn, dstring_data(&query));
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
slon_log(SLON_FATAL, "could not call slon_node_health_check() - %",
PQresultErrorMessage(res));
slon_abort();
}
else
{
if (PQntuples(res) != 1)
{
slon_log(SLON_FATAL,
"query '%s' returned %d rows (expected 1)\n",
query, PQntuples(res));
slon_abort();
}
else
{
if (*(PQgetvalue(res, 0, 0)) == 'f')
{
slon_log(SLON_FATAL,
"slon_node_health_check() returned false - fatal health problem!\n%s\nREPAIR CONFIG may be helpful to rectify this problem\n",
PQresultErrorMessage(res));
slon_abort();
}
}
}
PQclear(res);
dstring_free(&query);
#ifndef WIN32
if (signal(SIGHUP, SIG_IGN) == SIG_ERR)
{
slon_log(SLON_FATAL, "main: SIGHUP signal handler setup failed -(%d) %s\n", errno, strerror(errno));
slon_abort();
}
if (signal(SIGINT, SIG_IGN) == SIG_ERR)
{
slon_log(SLON_FATAL, "main: SIGINT signal handler setup failed -(%d) %s\n", errno, strerror(errno));
slon_abort();
}
if (signal(SIGTERM, SIG_IGN) == SIG_ERR)
{
slon_log(SLON_FATAL, "main: SIGTERM signal handler setup failed -(%d) %s\n", errno, strerror(errno));
slon_abort();
}
if (signal(SIGCHLD, SIG_IGN) == SIG_ERR)
{
slon_log(SLON_FATAL, "main: SIGCHLD signal handler setup failed -(%d) %s\n", errno, strerror(errno));
slon_abort();
}
if (signal(SIGQUIT, SIG_IGN) == SIG_ERR)
{
slon_log(SLON_FATAL, "main: SIGQUIT signal handler setup failed -(%d) %s\n", errno, strerror(errno));
slon_abort();
}
#endif
slon_log(SLON_INFO, "main: main process started\n");
/*
* Start the event scheduling system
*/
slon_log(SLON_CONFIG, "main: launching sched_start_mainloop\n");
if (sched_start_mainloop() < 0)
slon_retry();
slon_log(SLON_CONFIG, "main: loading current cluster configuration\n");
/*
* Begin a transaction
*/
res = PQexec(startup_conn,
"start transaction; "
"set transaction isolation level serializable;");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
slon_log(SLON_FATAL, "Cannot start transaction - %s - sleep 10s\n",
PQresultErrorMessage(res));
sleep(10);
PQclear(res);
slon_retry();
}
PQclear(res);
/*
* Read configuration table sl_node
*/
dstring_init(&query);
slon_mkquery(&query,
"select no_id, no_active, no_comment, "
" (select coalesce(max(con_seqno),0) from %s.sl_confirm "
" where con_origin = no_id and con_received = %d) "
" as last_event, "
" (select ev_snapshot from %s.sl_event "
" where ev_origin = no_id "
" and ev_seqno = (select max(ev_seqno) "
" from %s.sl_event "
" where ev_origin = no_id "
" and ev_type = 'SYNC')) as last_snapshot "
"from %s.sl_node "
"order by no_id; ",
rtcfg_namespace, rtcfg_nodeid,
rtcfg_namespace, rtcfg_namespace,
rtcfg_namespace);
res = PQexec(startup_conn, dstring_data(&query));
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
slon_log(SLON_FATAL, "main: Cannot get node list - %s\n",
PQresultErrorMessage(res));
PQclear(res);
dstring_free(&query);
slon_retry();
}
for (i = 0, n = PQntuples(res); i < n; i++)
{
int no_id = (int) strtol(PQgetvalue(res, i, 0), NULL, 10);
int no_active = (*PQgetvalue(res, i, 1) == 't') ? 1 : 0;
char *no_comment = PQgetvalue(res, i, 2);
int64 last_event;
if (no_id == rtcfg_nodeid)
{
/*
* Complete our own local node entry
*/
rtcfg_nodeactive = no_active;
rtcfg_nodecomment = strdup(no_comment);
}
else
{
/*
* Add a remote node
*/
slon_scanint64(PQgetvalue(res, i, 3), &last_event);
rtcfg_storeNode(no_id, no_comment);
rtcfg_setNodeLastEvent(no_id, last_event);
rtcfg_setNodeLastSnapshot(no_id, PQgetvalue(res, i, 4));
/*
* If it is active, remember for activation just before we start
* processing events.
*/
if (no_active)
rtcfg_needActivate(no_id);
}
}
PQclear(res);
/*
* Read configuration table sl_path - the interesting pieces
*/
slon_mkquery(&query,
"select pa_server, pa_conninfo, pa_connretry "
"from %s.sl_path where pa_client = %d"
" and pa_conninfo<>'<event pending>'",
rtcfg_namespace, rtcfg_nodeid);
res = PQexec(startup_conn, dstring_data(&query));
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
slon_log(SLON_FATAL, "main: Cannot get path config - %s\n",
PQresultErrorMessage(res));
PQclear(res);
dstring_free(&query);
slon_retry();
}
for (i = 0, n = PQntuples(res); i < n; i++)
{
int pa_server = (int) strtol(PQgetvalue(res, i, 0), NULL, 10);
char *pa_conninfo = PQgetvalue(res, i, 1);
int pa_connretry = (int) strtol(PQgetvalue(res, i, 2), NULL, 10);
rtcfg_storePath(pa_server, pa_conninfo, pa_connretry);
}
PQclear(res);
/*
* Load the initial listen configuration
*/
rtcfg_reloadListen(startup_conn);
/*
* Read configuration table sl_set
*/
slon_mkquery(&query,
"select set_id, set_origin, set_comment "
"from %s.sl_set",
rtcfg_namespace);
res = PQexec(startup_conn, dstring_data(&query));
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
slon_log(SLON_FATAL, "main: Cannot get set config - %s\n",
PQresultErrorMessage(res));
PQclear(res);
dstring_free(&query);
slon_retry();
}
for (i = 0, n = PQntuples(res); i < n; i++)
{
int set_id = (int) strtol(PQgetvalue(res, i, 0), NULL, 10);
int set_origin = (int) strtol(PQgetvalue(res, i, 1), NULL, 10);
char *set_comment = PQgetvalue(res, i, 2);
rtcfg_storeSet(set_id, set_origin, set_comment);
}
PQclear(res);
/*
* Read configuration table sl_subscribe - only subscriptions for local
* node
*/
slon_mkquery(&query,
"select sub_set, sub_provider, sub_forward, sub_active "
"from %s.sl_subscribe "
"where sub_receiver = %d",
rtcfg_namespace, rtcfg_nodeid);
res = PQexec(startup_conn, dstring_data(&query));
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
slon_log(SLON_FATAL, "main: Cannot get subscription config - %s\n",
PQresultErrorMessage(res));
PQclear(res);
dstring_free(&query);
slon_retry();
}
for (i = 0, n = PQntuples(res); i < n; i++)
{
int sub_set = (int) strtol(PQgetvalue(res, i, 0), NULL, 10);
int sub_provider = (int) strtol(PQgetvalue(res, i, 1), NULL, 10);
char *sub_forward = PQgetvalue(res, i, 2);
char *sub_active = PQgetvalue(res, i, 3);
rtcfg_storeSubscribe(sub_set, sub_provider, sub_forward);
if (*sub_active == 't')
rtcfg_enableSubscription(sub_set, sub_provider, sub_forward);
}
PQclear(res);
/*
* Remember the last known local event sequence
*/
slon_mkquery(&query,
"select coalesce(max(ev_seqno), -1) from %s.sl_event "
"where ev_origin = '%d'",
rtcfg_namespace, rtcfg_nodeid);
res = PQexec(startup_conn, dstring_data(&query));
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
slon_log(SLON_FATAL, "main: Cannot get last local eventid - %s\n",
PQresultErrorMessage(res));
PQclear(res);
dstring_free(&query);
slon_retry();
}
if (PQntuples(res) == 0)
strcpy(rtcfg_lastevent, "-1");
else if (PQgetisnull(res, 0, 0))
strcpy(rtcfg_lastevent, "-1");
else
strcpy(rtcfg_lastevent, PQgetvalue(res, 0, 0));
PQclear(res);
dstring_free(&query);
slon_log(SLON_CONFIG,
"main: last local event sequence = %s\n",
rtcfg_lastevent);
/*
* Rollback the transaction we used to get the config snapshot
*/
res = PQexec(startup_conn, "rollback transaction;");
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
slon_log(SLON_FATAL, "main: Cannot rollback transaction - %s\n",
PQresultErrorMessage(res));
PQclear(res);
slon_retry();
}
PQclear(res);
/*
* Done with the startup, don't need the local connection any more.
*/
PQfinish(startup_conn);
slon_log(SLON_CONFIG, "main: configuration complete - starting threads\n");
/*
* Create the local event thread that monitors the local node for
* administrative events to adjust the configuration at runtime. We wait
* here until the local listen thread has checked that there is no other
* slon daemon running.
*/
pthread_mutex_lock(&slon_wait_listen_lock);
if (pthread_create(&local_event_thread, NULL, localListenThread_main, NULL) < 0)
{
slon_log(SLON_FATAL, "main: cannot create localListenThread - %s\n",
strerror(errno));
slon_retry();
}
pthread_cond_wait(&slon_wait_listen_cond, &slon_wait_listen_lock);
if (!slon_listen_started)
{
/**
* The local listen thread did not start up properly.
*/
slon_log(SLON_FATAL, "main: localListenThread did not start\n");
slon_abort();
}
pthread_mutex_unlock(&slon_wait_listen_lock);
/*
* Enable all nodes that are active
*/
rtcfg_doActivate();
/*
* Create the local cleanup thread that will remove old events and log
* data.
*/
if (pthread_create(&local_cleanup_thread, NULL, cleanupThread_main, NULL) < 0)
{
slon_log(SLON_FATAL, "main: cannot create cleanupThread - %s\n",
strerror(errno));
slon_retry();
}
/*
* Create the local sync thread that will generate SYNC events if we had
* local database updates.
*/
if (pthread_create(&local_sync_thread, NULL, syncThread_main, NULL) < 0)
{
slon_log(SLON_FATAL, "main: cannot create syncThread - %s\n",
strerror(errno));
slon_retry();
}
/*
* Create the local monitor thread that will process monitoring requests
*/
if (monitor_threads)
{
if (pthread_create(&local_monitor_thread, NULL, monitorThread_main, NULL) < 0)
{
slon_log(SLON_FATAL, "main: cannot create monitorThread - %s\n",
strerror(errno));
slon_retry();
}
}
/*
* Wait until the scheduler has shut down all remote connections
*/
slon_log(SLON_INFO, "main: running scheduler mainloop\n");
if (sched_wait_mainloop() < 0)
{
slon_log(SLON_FATAL, "main: scheduler returned with error\n");
slon_retry();
}
slon_log(SLON_INFO, "main: scheduler mainloop returned\n");
/*
* Wait for all remote threads to finish
*/
main_thread = pthread_self();
slon_log(SLON_CONFIG, "main: wait for remote threads\n");
rtcfg_joinAllRemoteThreads();
/*
* Wait for the local threads to finish
*/
if (pthread_join(local_event_thread, NULL) < 0)
slon_log(SLON_ERROR, "main: cannot join localListenThread - %s\n",
strerror(errno));
if (pthread_join(local_cleanup_thread, NULL) < 0)
slon_log(SLON_ERROR, "main: cannot join cleanupThread - %s\n",
strerror(errno));
if (pthread_join(local_sync_thread, NULL) < 0)
slon_log(SLON_ERROR, "main: cannot join syncThread - %s\n",
strerror(errno));
if (pthread_join(local_monitor_thread, NULL) < 0)
slon_log(SLON_ERROR, "main: cannot join monitorThread - %s\n",
strerror(errno));
slon_log(SLON_CONFIG, "main: done\n");
exit(0);
}
/* ----------
* cleanupThread_main
*
* Periodically calls the stored procedure to remove old events and log data and
* vacuums those tables.
* ----------
*/
void *
cleanupThread_main( /* @unused@ */ void *dummy)
{
SlonConn *conn;
SlonDString query_baseclean;
SlonDString query2;
SlonDString query_pertbl;
PGconn *dbconn;
PGresult *res;
PGresult *res2;
struct timeval tv_start;
struct timeval tv_end;
int t;
int vac_count = 0;
int vac_enable = SLON_VACUUM_FREQUENCY;
char *vacuum_action;
int ntuples;
slon_log(SLON_CONFIG, "cleanupThread: thread starts\n");
/*
* Want the vacuum time bias to be between 0 and 100 seconds, hence
* between 0 and 100000
*/
if (vac_bias == 0)
{
vac_bias = rand() % (SLON_CLEANUP_SLEEP * 166);
}
slon_log(SLON_CONFIG, "cleanupThread: bias = %d\n", vac_bias);
/*
* Connect to the local database
*/
if ((conn = slon_connectdb(rtcfg_conninfo, "local_cleanup")) == NULL)
{
#ifndef WIN32
(void) kill(getpid(), SIGTERM);
pthread_exit(NULL);
#else
exit(0);
#endif
/* slon_retry(); */
}
dbconn = conn->dbconn;
monitor_state("local_cleanup", 0, conn->conn_pid, "thread main loop", 0, "n/a");
/*
* Build the query string for calling the cleanupEvent() stored procedure
*/
dstring_init(&query_baseclean);
slon_mkquery(&query_baseclean,
"begin;"
"lock table %s.sl_config_lock;"
"select %s.cleanupEvent('%s'::interval);"
"commit;",
rtcfg_namespace,
rtcfg_namespace,
cleanup_interval
);
dstring_init(&query2);
/*
* Loop until shutdown time arrived
*
* Note the introduction of vac_bias and an up-to-100s random "fuzz"; this
* reduces the likelihood that having multiple slons hitting the same
* cluster will run into conflicts due to trying to vacuum common tables *
* such as pg_listener concurrently
*/
while (sched_wait_time(conn, SCHED_WAIT_SOCK_READ, SLON_CLEANUP_SLEEP * 1000 + vac_bias + (rand() % (SLON_CLEANUP_SLEEP * 166))) == SCHED_STATUS_OK)
{
/*
* Call the stored procedure cleanupEvent()
*/
monitor_state("local_cleanup", 0, conn->conn_pid, "cleanupEvent", 0, "n/a");
gettimeofday(&tv_start, NULL);
res = PQexec(dbconn, dstring_data(&query_baseclean));
if (PQresultStatus(res) != PGRES_COMMAND_OK)
{
slon_log(SLON_FATAL,
"cleanupThread: \"%s\" - %s",
dstring_data(&query_baseclean), PQresultErrorMessage(res));
PQclear(res);
slon_retry();
break;
}
PQclear(res);
gettimeofday(&tv_end, NULL);
slon_log(SLON_INFO,
"cleanupThread: %8.3f seconds for cleanupEvent()\n",
TIMEVAL_DIFF(&tv_start, &tv_end));
/*
* Detain the usual suspects (vacuum event and log data)
*/
if (vac_frequency != 0)
{
vac_enable = vac_frequency;
}
if (++vac_count >= vac_enable)
{
unsigned long latest_xid;
vac_count = 0;
latest_xid = get_earliest_xid(dbconn);
vacuum_action = "";
if (earliest_xid == latest_xid)
{
slon_log(SLON_INFO,
"cleanupThread: xid %d still active - analyze instead\n",
earliest_xid);
}
else
{
if (vac_enable == vac_frequency)
{
vacuum_action = "vacuum ";
}
}
earliest_xid = latest_xid;
/*
* Build the query string for vacuuming replication runtime data
* and event tables
*/
gettimeofday(&tv_start, NULL);
slon_mkquery(&query2, "select nspname, relname from %s.TablesToVacuum();", rtcfg_namespace);
res = PQexec(dbconn, dstring_data(&query2));
/*
* for each table... and we should set up the query to return not
* only the table name, but also a boolean to support what's in
* the SELECT below; that'll nicely simplify this process...
*/
if (PQresultStatus(res) != PGRES_TUPLES_OK) /* query error */
{
slon_log(SLON_ERROR,
"cleanupThread: \"%s\" - %s",
dstring_data(&query2), PQresultErrorMessage(res));
}
ntuples = PQntuples(res);
slon_log(SLON_DEBUG1, "cleanupThread: number of tables to clean: %d\n", ntuples);
monitor_state("local_cleanup", 0, conn->conn_pid, "vacuumTables", 0, "n/a");
for (t = 0; t < ntuples; t++)
{
char *tab_nspname = PQgetvalue(res, t, 0);
char *tab_relname = PQgetvalue(res, t, 1);
ExecStatusType vrc;
slon_log(SLON_DEBUG1, "cleanupThread: %s analyze \"%s\".%s;\n",
vacuum_action, tab_nspname, tab_relname);
dstring_init(&query_pertbl);
slon_mkquery(&query_pertbl, "%s analyze \"%s\".%s;",
vacuum_action, tab_nspname, tab_relname);
res2 = PQexec(dbconn, dstring_data(&query_pertbl));
vrc = PQresultStatus(res2);
if (vrc == PGRES_FATAL_ERROR)
{
slon_log(SLON_ERROR,
"cleanupThread: \"%s\" - %s\n",
dstring_data(&query_pertbl), PQresultErrorMessage(res2));
/*
* slon_retry(); break;
*/
}
else
{
if (vrc == PGRES_NONFATAL_ERROR)
{
slon_log(SLON_WARN,
"cleanupThread: \"%s\" - %s\n",
dstring_data(&query_pertbl), PQresultErrorMessage(res2));
}
}
PQclear(res2);
dstring_reset(&query_pertbl);
}
gettimeofday(&tv_end, NULL);
slon_log(SLON_INFO,
"cleanupThread: %8.3f seconds for vacuuming\n",
TIMEVAL_DIFF(&tv_start, &tv_end));
/*
* Free Resources
*/
dstring_free(&query_pertbl);
PQclear(res);
monitor_state("local_cleanup", 0, conn->conn_pid, "thread main loop", 0, "n/a");
}
}
/*
* Free Resources
*/
dstring_free(&query_baseclean);
dstring_free(&query2);
/*
* Disconnect from the database
*/
slon_disconnectdb(conn);
/*
* Terminate this thread
*/
slon_log(SLON_DEBUG1, "cleanupThread: thread done\n");
pthread_exit(NULL);
}
/* ----------
* slon_log
* ----------
*/
void
slon_log(Slon_Log_Level level, char *fmt,...)
{
va_list ap;
static char *outbuf = NULL;
static int outsize = -1;
int off;
int len;
char *level_c = NULL;
char time_buf[128]; /* Buffer to hold timestamp */
char ps_buf[20]; /* Buffer to hold PID */
time_t stamp_time = time(NULL);
#ifdef HAVE_SYSLOG
int syslog_level = LOG_ERR;
#endif
if (level > slon_log_level)
return;
switch (level)
{
case SLON_DEBUG4:
level_c = "DEBUG4";
#ifdef HAVE_SYSLOG
syslog_level = LOG_DEBUG;
#endif
break;
case SLON_DEBUG3:
level_c = "DEBUG3";
#ifdef HAVE_SYSLOG
syslog_level = LOG_DEBUG;
#endif
break;
case SLON_DEBUG2:
level_c = "DEBUG2";
#ifdef HAVE_SYSLOG
syslog_level = LOG_DEBUG;
#endif
break;
case SLON_DEBUG1:
level_c = "DEBUG1";
#ifdef HAVE_SYSLOG
syslog_level = LOG_DEBUG;
#endif
break;
case SLON_INFO:
level_c = "INFO";
#ifdef HAVE_SYSLOG
syslog_level = LOG_INFO;
#endif
break;
case SLON_CONFIG:
level_c = "CONFIG";
#ifdef HAVE_SYSLOG
syslog_level = LOG_WARNING;
#endif
break;
case SLON_WARN:
level_c = "WARN";
#ifdef HAVE_SYSLOG
syslog_level = LOG_WARNING;
#endif
break;
case SLON_ERROR:
level_c = "ERROR";
#ifdef HAVE_SYSLOG
syslog_level = LOG_ERR;
#endif
break;
case SLON_FATAL:
level_c = "FATAL";
#ifdef HAVE_SYSLOG
syslog_level = LOG_ERR;
#endif
break;
}
va_start(ap, fmt);
pthread_mutex_lock(&log_mutex);
if (outbuf == NULL)
{
outsize = 8192;
outbuf = malloc((size_t) outsize);
if (outbuf == NULL)
{
perror("slon_log: malloc()");
pthread_mutex_unlock(&log_mutex);
slon_retry();
}
}
outbuf[0] = (char) 0;
if (logtimestamp == true && (Use_syslog != 1)
#ifdef WIN32
&& !win32_isservice
#endif
)
{
len = (int) strftime(time_buf, sizeof(time_buf), log_timestamp_format, localtime(&stamp_time));
if (len == 0 && time_buf[0] != '\0') {
perror("slon_log: problem with strftime()");
slon_retry();
}
} else {
time_buf[0] = (char) 0;
}
if (logpid == true)
{
sprintf(ps_buf, "[%d] ", slon_pid);
} else {
ps_buf[0] = (char) 0;
}
sprintf(outbuf, "%s%s%-6.6s ", time_buf, ps_buf, level_c);
off = (int) strlen(outbuf);
va_list apcopy;
va_copy(apcopy,ap);
while (vsnprintf(&outbuf[off], (size_t) (outsize - off), fmt, apcopy) >= outsize - off - 1)
{
outsize *= 2;
outbuf = realloc(outbuf, (size_t) outsize);
if (outbuf == NULL)
{
perror("slon_log: realloc()");
slon_retry();
}
va_end(apcopy);
va_copy(apcopy, ap);
}
va_end(apcopy);
#ifdef HAVE_SYSLOG
if (Use_syslog >= 1)
{
write_syslog(syslog_level, outbuf);
}
#endif
#ifdef WIN32
if (win32_isservice)
win32_eventlog(level, outbuf);
#endif
#ifdef HAVE_SYSLOG
if (Use_syslog != 2) {
(void) fwrite(outbuf, strlen(outbuf), 1, stdout);
(void) fflush(stdout);
}
#else
(void) fwrite(outbuf, strlen(outbuf), 1, stdout);
(void) fflush(stdout);
#endif
pthread_mutex_unlock(&log_mutex);
va_end(ap);
}
