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Add log_hint() function for logging hints

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There are a few places where additional hints are written as log
output, usually LOG_NOTICE. Create an explicit function to provide
hints in a standardized manner; by storing the log level of the
previous logger call, we can ensure the hint is only displayed when
the log message itself would be.

Part of an ongoing effort to better control repmgr's logging output.
This commit is contained in:
Ian Barwick
2015-11-13 14:29:11 +09:00
parent ea01d1d30b
commit ae84041a4e
4 changed files with 30 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
log.c
View File

@@ -44,7 +44,7 @@ static int detect_log_facility(const char *facility);
int log_type = REPMGR_STDERR;
int log_level = LOG_NOTICE;
int last_log_level = LOG_NOTICE;
void
stderr_log_with_level(const char *level_name, int level, const char *fmt, ...)
@@ -54,6 +54,12 @@ stderr_log_with_level(const char *level_name, int level, const char *fmt, ...)
char buff[100];
va_list ap;
/*
* Store the requested level so that if there's a subsequent
* log_hint(), we can suppress that if appropriate.
*/
last_log_level = level;
if (log_level >= level)
{
time(&t);
@@ -69,6 +75,16 @@ stderr_log_with_level(const char *level_name, int level, const char *fmt, ...)
}
}
void
log_hint(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
stderr_log_with_level("HINT", last_log_level, fmt, ap);
va_end(ap);
}
bool
logger_init(t_configuration_options * opts, const char *ident, const char *level, const char *facility)

3
log.h
View File

@@ -115,10 +115,11 @@ __attribute__((format(PG_PRINTF_ATTRIBUTE, 3, 4)));
/* Logger initialisation and shutdown */
bool logger_shutdown(void);
bool logger_init(t_configuration_options * opts, const char *ident,
bool logger_init(t_configuration_options * opts, const char *ident,
const char *level, const char *facility);
void logger_min_verbose(int minimum);
void log_hint(const char *fmt, ...);
extern int log_type;
extern int log_level;

18
repmgr.c
View File

@@ -495,6 +495,7 @@ main(int argc, char **argv)
* logging level might be specified at, but it often requires detailed
* logging to troubleshoot problems.
*/
logger_init(&options, progname(), options.loglevel, options.logfacility);
if (runtime_options.verbose)
logger_min_verbose(LOG_INFO);
@@ -616,7 +617,7 @@ do_cluster_show(void)
{
log_err(_("Unable to retrieve node information from the database\n%s\n"),
PQerrorMessage(conn));
log_notice(_("HINT: Please check that all nodes have been registered\n"));
log_hint(_("Please check that all nodes have been registered\n"));
PQclear(res);
PQfinish(conn);
@@ -965,9 +966,10 @@ do_standby_register(void)
{
if (!runtime_options.force)
{
log_notice(_("HINT: use option -F/--force to overwrite an existing node record\n"));
log_hint(_("use option -F/--force to overwrite an existing node record\n"));
}
// XXX log registration failure?
PQfinish(master_conn);
PQfinish(conn);
exit(ERR_BAD_CONFIG);
@@ -1338,7 +1340,7 @@ do_standby_clone(void)
{
log_err(_("unable to use directory %s ...\n"),
local_data_directory);
log_notice(_("HINT: Use -F/--force option to force this directory to be overwritten\n"));
log_hint(_("use -F/--force option to force this directory to be overwritten\n"));
r = ERR_BAD_CONFIG;
retval = ERR_BAD_CONFIG;
goto stop_backup;
@@ -1720,10 +1722,10 @@ stop_backup:
* - provide a custom pg_ctl command
*/
log_notice(_("HINT: you can now start your PostgreSQL server\n"));
log_notice(_("you can now start your PostgreSQL server\n"));
if (target_directory_provided)
{
log_notice(_("for example : pg_ctl -D %s start\n"),
log_hint(_("for example : pg_ctl -D %s start\n"),
local_data_directory);
}
else
@@ -3475,7 +3477,7 @@ check_upstream_config(PGconn *conn, int server_version_num, bool exit_on_error)
if (i == 0)
{
log_err(_("parameter 'max_replication_slots' must be set to at least 1 to enable replication slots\n"));
log_notice(_("HINT: 'max_replication_slots' should be set to at least the number of expected standbys\n"));
log_hint(_("'max_replication_slots' should be set to at least the number of expected standbys\n"));
if (exit_on_error == true)
{
PQfinish(conn);
@@ -3504,7 +3506,7 @@ check_upstream_config(PGconn *conn, int server_version_num, bool exit_on_error)
runtime_options.wal_keep_segments);
if (server_version_num >= 90400)
{
log_notice(_("HINT: in PostgreSQL 9.4 and later, replication slots can be used, which "
log_hint(_("in PostgreSQL 9.4 and later, replication slots can be used, which "
"do not require 'wal_keep_segments' to be set to a high value "
"(set parameter 'use_replication_slots' in the configuration file to enable)\n"
));
@@ -3587,7 +3589,7 @@ check_upstream_config(PGconn *conn, int server_version_num, bool exit_on_error)
if (i == 0)
{
log_err(_("parameter 'max_wal_senders' must be set to be at least 1\n"));
log_notice(_("HINT: 'max_wal_senders' should be set to at least the number of expected standbys\n"));
log_hint(_("'max_wal_senders' should be set to at least the number of expected standbys\n"));
}
if (exit_on_error == true)

2
repmgrd.c
View File

@@ -281,7 +281,7 @@ main(int argc, char **argv)
if (node_info.node_id == NODE_NOT_FOUND)
{
log_err(_("No metadata record found for this node - terminating\n"));
log_notice(_("HINT: was this node registered with 'repmgr (master|standby) register'?\n"));
log_hint(_("Check that 'repmgr (master|standby) register' was executed for this node\n"));
terminate(ERR_BAD_CONFIG);
}