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Add MASTER REGISTER and STANDBY REGISTER commands.

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This commit is contained in:
Jaime Casanova
2010-10-18 02:21:55 -05:00
parent 6779a96b0b
commit 378bdd7bd4
6 changed files with 427 additions and 111 deletions
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87
repmgrd.c
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@@ -40,7 +40,6 @@ bool verbose = false;
static void help(const char *progname);
static void checkClusterConfiguration(void);
static void checkNodeConfiguration(char *conninfo);
static void getPrimaryConnection(void);
static void CancelQuery(void);
static void MonitorExecute(void);
@@ -148,7 +147,9 @@ main(int argc, char **argv)
else
{
/* I need the id of the primary as well as a connection to it */
getPrimaryConnection();
primaryConn = getMasterConnection(myLocalConn, myLocalId, myClusterName, &primaryId);
if (primaryConn == NULL)
exit(1);
}
checkClusterConfiguration();
@@ -165,88 +166,6 @@ main(int argc, char **argv)
}
/*
* get a connection to primary by reading repl_nodes, creating a connection
* to each node (one at a time) and finding if it is a primary or a standby
*/
static void
getPrimaryConnection(void)
{
PGresult *res1;
PGresult *res2;
int i;
/* find all nodes belonging to this cluster */
sprintf(sqlquery, "SELECT * FROM repl_nodes "
" WHERE cluster = '%s' and id <> %d",
myClusterName, myLocalId);
res1 = PQexec(myLocalConn, sqlquery);
if (PQresultStatus(res1) != PGRES_TUPLES_OK)
{
fprintf(stderr, "Can't get nodes info: %s\n", PQerrorMessage(myLocalConn));
PQclear(res1);
CloseConnections();
exit(1);
}
for (i = 0; i < PQntuples(res1); i++)
{
/* initialize with the values of the current node being processed */
primaryId = atoi(PQgetvalue(res1, i, 0));
strcpy(primaryConninfo, PQgetvalue(res1, i, 2));
primaryConn = establishDBConnection(primaryConninfo, false);
/*
* I can't use the is_standby() function here because on error that
* function closes the one i pass and exit, but i still need to close
* myLocalConn
*/
res2 = PQexec(primaryConn, "SELECT pg_is_in_recovery()");
if (PQresultStatus(res2) != PGRES_TUPLES_OK)
{
fprintf(stderr, "Can't get nodes info: %s\n", PQerrorMessage(primaryConn));
PQclear(res1);
PQclear(res2);
CloseConnections();
exit(1);
}
/* if false, this is the primary */
if (strcmp(PQgetvalue(res2, 0, 0), "f") == 0)
{
PQclear(res2);
PQclear(res1);
/* We turn off synchronous_commit for the monitor info inserts */
res1 = PQexec(primaryConn, "SET synchronous_commit TO off");
PQclear(res1);
return;
}
else
{
/* if it is a standby clear info */
PQclear(res2);
PQfinish(primaryConn);
primaryId = -1;
}
}
/* If we finish this loop without finding a primary then
* we doesn't have the info or the primary has failed (or we
* reached max_connections or superuser_reserved_connections,
* anything else i'm missing?),
* Probably we will need to check the error to know if we need
* to start failover procedure or just fix some situation on the
* standby.
*/
fprintf(stderr, "There isn't a primary node the cluster\n");
PQclear(res1);
CloseConnections();
exit(1);
}
/*
* Insert monitor info, this is basically the time and xlog replayed,
* applied on standby and current xlog location in primary.