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Some infrastructure for supporting cascading replication

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Does not fully work yet.
This commit is contained in:
Ian Barwick
2015-01-15 15:37:09 +09:00
parent d141d2a8aa
commit 2ae27521a3
3 changed files with 96 additions and 15 deletions
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79
dbutils.c
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@@ -356,6 +356,75 @@ get_pg_setting(PGconn *conn, const char *setting, char *output)
}
PGconn *
get_upstream_connection(PGconn *standby_conn, char *cluster,
int *upstream_node_id, char *upstream_conninfo_out)
{
PGconn *upstream_conn = NULL;
PGresult *res;
char sqlquery[QUERY_STR_LEN];
char upstream_conninfo_stack[MAXCONNINFO];
char *upstream_conninfo = &*upstream_conninfo_stack;
/*
* If the caller wanted to get a copy of the connection info string, sub
* out the local stack pointer for the pointer passed by the caller.
*/
if (upstream_conninfo_out != NULL)
upstream_conninfo = upstream_conninfo_out;
/* hacky query */
sqlquery_snprintf(sqlquery,
"WITH i AS ( "
" WITH p AS ( "
" SELECT repmgr_get_primary_conninfo() AS conninfo "
" )"
" SELECT p.conninfo, "
" unnest(regexp_matches(conninfo,'application_name=(\\S+)')) AS name "
" FROM p "
") "
" SELECT rn.conninfo, i.name, rn.id "
" FROM i "
"INNER JOIN %s.repl_nodes rn "
" ON rn.name = i.name "
" WHERE cluster = '%s' ",
get_repmgr_schema_quoted(standby_conn),
cluster);
log_debug("%s", sqlquery);
res = PQexec(standby_conn, sqlquery);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
log_err(_("Unable to get conninfo for upstream server: %s\n"),
PQerrorMessage(standby_conn));
PQclear(res);
return NULL;
}
// ZZZ check for empty result
// maybe modify function to return NULL
strncpy(upstream_conninfo, PQgetvalue(res, 0, 0), MAXCONNINFO);
*upstream_node_id = atoi(PQgetvalue(res, 0, 1));
PQclear(res);
log_debug("conninfo is: '%s'", upstream_conninfo);
upstream_conn = establish_db_connection(upstream_conninfo, false);
if (PQstatus(upstream_conn) != CONNECTION_OK)
{
log_err(_("Unable to connect to upstream server: %s\n"),
PQerrorMessage(upstream_conn));
return NULL;
}
return upstream_conn;
}
/*
* get a connection to master by reading repl_nodes, creating a connection
* to each node (one at a time) and finding if it is a master or a standby
@@ -364,6 +433,8 @@ get_pg_setting(PGconn *conn, const char *setting, char *output)
* point to allocated memory of MAXCONNINFO in length, and the master server
* connection string is placed there.
*/
// ZZZ value placed in `master_id` used by callers in repmgrd
PGconn *
get_master_connection(PGconn *standby_conn, char *cluster,
int *master_id, char *master_conninfo_out)
@@ -377,14 +448,8 @@ get_master_connection(PGconn *standby_conn, char *cluster,
int i;
/*
* If the caller wanted to get a copy of the connection info string, sub
* out the local stack pointer for the pointer passed by the caller.
*/
if (master_conninfo_out != NULL)
master_conninfo = master_conninfo_out;
// ZZZ below old stuff
/* find all nodes belonging to this cluster */
log_info(_("finding node list for cluster '%s'\n"),
cluster);