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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
committed by Ian Barwick
parent 2aa67c992c
commit 531194fa27
3 changed files with 103 additions and 4 deletions
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3
configfile.c
View File

@@ -362,6 +362,7 @@ _parse_config(t_configuration_options *options, ItemList *error_list, ItemList *
options->sibling_nodes_disconnect_timeout = DEFAULT_SIBLING_NODES_DISCONNECT_TIMEOUT;
options->connection_check_type = CHECK_PING;
options->primary_visibility_consensus = false;
memset(options->failover_validation_command, 0, sizeof(options->failover_validation_command));
/*-------------
* witness settings
@@ -644,6 +645,8 @@ _parse_config(t_configuration_options *options, ItemList *error_list, ItemList *
}
else if (strcmp(name, "primary_visibility_consensus") == 0)
options->primary_visibility_consensus = parse_bool(value, name, error_list);
else if (strcmp(name, "failover_validation_command") == 0)
strncpy(options->failover_validation_command, value, sizeof(options->failover_validation_command));
/* witness settings */
else if (strcmp(name, "witness_sync_interval") == 0)

5
configfile.h
View File

@@ -145,6 +145,7 @@ typedef struct
int sibling_nodes_disconnect_timeout;
ConnectionCheckType connection_check_type;
bool primary_visibility_consensus;
char failover_validation_command[MAXPGPATH];
/* BDR settings */
bool bdr_local_monitoring_only;
@@ -189,7 +190,7 @@ typedef struct
/* node information */ \
UNKNOWN_NODE_ID, "", "", "", "", "", "", "", REPLICATION_TYPE_PHYSICAL, \
/* log settings */ \
"", "", "", DEFAULT_LOG_STATUS_INTERVAL, \
"", "", "", DEFAULT_LOG_STATUS_INTERVAL, \
/* standby clone settings */ \
false, "", "", { NULL, NULL }, "", false, "", false, "", \
/* standby promote settings */ \
@@ -216,7 +217,7 @@ typedef struct
false, -1, \
DEFAULT_ASYNC_QUERY_TIMEOUT, \
DEFAULT_PRIMARY_NOTIFICATION_TIMEOUT, \
-1, "", false, DEFAULT_SIBLING_NODES_DISCONNECT_TIMEOUT, CHECK_PING, true, \
-1, "", false, DEFAULT_SIBLING_NODES_DISCONNECT_TIMEOUT, CHECK_PING, true, "", \
/* BDR settings */ \
false, DEFAULT_BDR_RECOVERY_TIMEOUT, \
/* service settings */ \

99
repmgrd-physical.c
View File

@@ -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;
}