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Initial implementation of "failover_validation_command"

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This commit is contained in:
Ian Barwick
2019-02-27 16:32:46 +09:00
parent 6f4f56dd8c
commit db0d71c6a7
3 changed files with 103 additions and 4 deletions
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99
repmgrd-physical.c
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@@ -23,7 +23,6 @@
#include "repmgrd.h"
#include "repmgrd-physical.h"
typedef enum
{
FAILOVER_STATE_UNKNOWN = -1,
@@ -88,7 +87,8 @@ static void update_monitoring_history(void);
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 void parse_failover_validation_command(const char *template, t_node_info *node_info, PQExpBufferData *out);
void
handle_sigint_physical(SIGNAL_ARGS)
@@ -3571,7 +3571,58 @@ do_election(void)
candidate_node->node_id);
if (candidate_node->node_id == local_node_info.node_id)
{
/*
* If "failover_validation_command" is set, execute that command.
*/
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 ELECTION_WON;
}
return ELECTION_LOST;
}
@@ -3782,3 +3833,47 @@ handle_sighup(PGconn **conn, t_server_type server_type)
got_SIGHUP = false;
}
static void
parse_failover_validation_command(const char *template, t_node_info *node_info, PQExpBufferData *out)
{
const char *src_ptr;
for (src_ptr = template; *src_ptr; src_ptr++)
{
if (*src_ptr == '%')
{
switch (src_ptr[1])
{
case '%':
/* %%: replace with % */
src_ptr++;
appendPQExpBufferChar(out, *src_ptr);
break;
case 'n':
/* %n: node id */
src_ptr++;
appendPQExpBuffer(out, "%i", node_info->node_id);
break;
case 'a':
/* %a: node name */
src_ptr++;
appendPQExpBufferStr(out, node_info->node_name);
break;
default:
/* otherwise treat the % as not special */
appendPQExpBufferChar(out, *src_ptr);
break;
}
}
else
{
appendPQExpBufferChar(out, *src_ptr);
}
}
return;
}