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Execute "failover_validation_command" when only one standby exists

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This commit is contained in:
Ian Barwick
2019-03-08 12:19:37 +09:00
committed by Ian Barwick
parent 514595ea10
commit 45c896d716
1 changed files with 61 additions and 43 deletions
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104
repmgrd-physical.c
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@@ -88,6 +88,7 @@ static void handle_sighup(PGconn **conn, t_server_type server_type);
static const char *format_failover_state(FailoverState failover_state);
static const char * format_failover_state(FailoverState failover_state);
static ElectionResult execute_failover_validation_command(t_node_info *node_info);
static void parse_failover_validation_command(const char *template, t_node_info *node_info, PQExpBufferData *out);
void
@@ -3263,7 +3264,13 @@ do_election(void)
{
if (strncmp(upstream_node_info.location, local_node_info.location, MAXLEN) == 0)
{
if (config_file_options.failover_validation_command[0] != '\0')
{
return execute_failover_validation_command(&local_node_info);
}
log_info(_("no other sibling nodes - we win by default"));
return ELECTION_WON;
}
else
@@ -3573,52 +3580,13 @@ do_election(void)
if (candidate_node->node_id == local_node_info.node_id)
{
/*
* If "failover_validation_command" is set, execute that command.
* If "failover_validation_command" is set, execute that command
* and decide the result based on the command's output
*/
if (config_file_options.failover_validation_command[0] != '\0')
{
PQExpBufferData failover_validation_command;
PQExpBufferData command_output;
int return_value = -1;
initPQExpBuffer(&failover_validation_command);
initPQExpBuffer(&command_output);
parse_failover_validation_command(config_file_options.failover_validation_command,
candidate_node,
&failover_validation_command);
log_notice(_("executing \"failover_validation_command\""));
log_detail("%s", failover_validation_command.data);
/* we determine success of the command by the value placed into return_value */
(void) local_command_return_value(failover_validation_command.data,
&command_output,
&return_value);
termPQExpBuffer(&failover_validation_command);
if (return_value != 0)
log_warning(_("failover validation command returned %i"), return_value);
if (command_output.data[0] != '\0')
{
log_info("output returned by failover validation command:\n%s", command_output.data);
}
else
{
log_info(_("no output returned from command"));
}
termPQExpBuffer(&command_output);
if (return_value != 0)
{
/* create event here? */
log_notice(_("failover validation command returned a non-zero value (%i)"), return_value);
return ELECTION_LOST;
}
return execute_failover_validation_command(candidate_node);
}
return ELECTION_WON;
@@ -3834,9 +3802,59 @@ handle_sighup(PGconn **conn, t_server_type server_type)
got_SIGHUP = false;
}
static ElectionResult
execute_failover_validation_command(t_node_info *node_info)
{
PQExpBufferData failover_validation_command;
PQExpBufferData command_output;
int return_value = -1;
initPQExpBuffer(&failover_validation_command);
initPQExpBuffer(&command_output);
parse_failover_validation_command(config_file_options.failover_validation_command,
node_info,
&failover_validation_command);
log_notice(_("executing \"failover_validation_command\""));
log_detail("%s", failover_validation_command.data);
/* we determine success of the command by the value placed into return_value */
(void) local_command_return_value(failover_validation_command.data,
&command_output,
&return_value);
termPQExpBuffer(&failover_validation_command);
if (return_value != 0)
log_warning(_("failover validation command returned %i"), return_value);
if (command_output.data[0] != '\0')
{
log_info("output returned by failover validation command:\n%s", command_output.data);
}
else
{
log_info(_("no output returned from command"));
}
termPQExpBuffer(&command_output);
if (return_value != 0)
{
/* create event here? */
log_notice(_("failover validation command returned a non-zero value (%i)"), return_value);
return ELECTION_LOST;
}
log_notice(_("failover validation command returned zero"));
return ELECTION_WON;
}
static void
parse_failover_validation_command(const char *template, t_node_info *node_info, PQExpBufferData *out)
parse_failover_validation_command(const char *template, t_node_info *node_info, PQExpBufferData *out)
{
const char *src_ptr;