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Commit19dc233

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Add pg_current_logfile() function.
The syslogger will write out the current stderr and csvlog names, ifit's running and there are any, to a new file in the data directorycalled "current_logfiles". We take care to remove this file when itmight no longer be valid (but not at shutdown). The functionpg_current_logfile() can be used to read the entries in the file.Gilles Darold, reviewed and modified by Karl O. Pinc, MichaelPaquier, and me. Further review by Álvaro Herrera and Christoph Berg.
1 parentaea5d29 commit19dc233

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12 files changed

+288
-4
lines changed

12 files changed

+288
-4
lines changed

‎doc/src/sgml/config.sgml

Lines changed: 26 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -4280,6 +4280,11 @@ SELECT * FROM parent WHERE key = 2400;
42804280
<primary>where to log</primary>
42814281
</indexterm>
42824282

4283+
<indexterm>
4284+
<primary>current_logfiles</primary>
4285+
<secondary>and the log_destination configuration parameter</secondary>
4286+
</indexterm>
4287+
42834288
<variablelist>
42844289

42854290
<varlistentry id="guc-log-destination" xreflabel="log_destination">
@@ -4310,6 +4315,27 @@ SELECT * FROM parent WHERE key = 2400;
43104315
<xref linkend="guc-logging-collector"> must be enabled to generate
43114316
CSV-format log output.
43124317
</para>
4318+
<para>
4319+
When either <systemitem>stderr</systemitem> or
4320+
<systemitem>csvlog</systemitem> are included, the file
4321+
<filename>current_logfiles</> is created to record the location
4322+
of the log file(s) currently in use by the logging collector and the
4323+
associated logging destination. This provides a convenient way to
4324+
find the logs currently in use by the instance. Here is an example of
4325+
this file's content:
4326+
<programlisting>
4327+
stderr pg_log/postgresql.log
4328+
csvlog pg_log/postgresql.csv
4329+
</programlisting>
4330+
4331+
<filename>current_logfiles</filename> is recreated when a new log file
4332+
is created as an effect of rotation, and
4333+
when <varname>log_destination</> is reloaded. It is removed when
4334+
neither <systemitem>stderr</systemitem>
4335+
nor <systemitem>csvlog</systemitem> are included
4336+
in <varname>log_destination</>, and when the logging collector is
4337+
disabled.
4338+
</para>
43134339

43144340
<note>
43154341
<para>

‎doc/src/sgml/func.sgml

Lines changed: 46 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -15478,6 +15478,13 @@ SELECT * FROM pg_ls_dir('.') WITH ORDINALITY AS t(ls,n);
1547815478
<entry>configuration load time</entry>
1547915479
</row>
1548015480

15481+
<row>
15482+
<entry><literal><function>pg_current_logfile(<optional><type>text</></optional>)</function></literal></entry>
15483+
<entry><type>text</type></entry>
15484+
<entry>Primary log file name, or log in the requested format,
15485+
currently in use by the logging collector</entry>
15486+
</row>
15487+
1548115488
<row>
1548215489
<entry><literal><function>pg_my_temp_schema()</function></literal></entry>
1548315490
<entry><type>oid</type></entry>
@@ -15696,6 +15703,45 @@ SET search_path TO <replaceable>schema</> <optional>, <replaceable>schema</>, ..
1569615703
the time when the postmaster process re-read the configuration files.)
1569715704
</para>
1569815705

15706+
<indexterm>
15707+
<primary>pg_current_logfile</primary>
15708+
</indexterm>
15709+
15710+
<indexterm>
15711+
<primary>Logging</primary>
15712+
<secondary>pg_current_logfile function</secondary>
15713+
</indexterm>
15714+
15715+
<indexterm>
15716+
<primary>current_logfiles</primary>
15717+
<secondary>and the pg_current_logfile function</secondary>
15718+
</indexterm>
15719+
15720+
<indexterm>
15721+
<primary>Logging</primary>
15722+
<secondary>current_logfiles file and the pg_current_logfile
15723+
function</secondary>
15724+
</indexterm>
15725+
15726+
<para>
15727+
<function>pg_current_logfile</function> returns, as <type>text</type>,
15728+
the path of the log file(s) currently in use by the logging collector.
15729+
The path includes the <xref linkend="guc-log-directory"> directory
15730+
and the log file name. Log collection must be enabled or the return value
15731+
is <literal>NULL</literal>. When multiple log files exist, each in a
15732+
different format, <function>pg_current_logfile</function> called
15733+
without arguments returns the path of the file having the first format
15734+
found in the ordered list: <systemitem>stderr</>, <systemitem>csvlog</>.
15735+
<literal>NULL</literal> is returned when no log file has any of these
15736+
formats. To request a specific file format supply, as <type>text</type>,
15737+
either <systemitem>csvlog</> or <systemitem>stderr</> as the value of the
15738+
optional parameter. The return value is <literal>NULL</literal> when the
15739+
log format requested is not a configured
15740+
<xref linkend="guc-log-destination">. The
15741+
<function>pg_current_logfiles</function> reflects the contents of the
15742+
<filename>current_logfiles</> file.
15743+
</para>
15744+
1569915745
<indexterm>
1570015746
<primary>pg_my_temp_schema</primary>
1570115747
</indexterm>

‎doc/src/sgml/storage.sgml

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -60,6 +60,12 @@ Item
6060
<entry>Subdirectory containing per-database subdirectories</entry>
6161
</row>
6262

63+
<row>
64+
<entry><filename>current_logfiles</></entry>
65+
<entry>File recording the log file(s) currently written to by the logging
66+
collector</entry>
67+
</row>
68+
6369
<row>
6470
<entry><filename>global</></entry>
6571
<entry>Subdirectory containing cluster-wide tables, such as

‎src/backend/catalog/system_views.sql

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1091,6 +1091,8 @@ REVOKE EXECUTE ON FUNCTION pg_wal_replay_pause() FROM public;
10911091
REVOKE EXECUTEON FUNCTION pg_wal_replay_resume()FROM public;
10921092
REVOKE EXECUTEON FUNCTION pg_rotate_logfile()FROM public;
10931093
REVOKE EXECUTEON FUNCTION pg_reload_conf()FROM public;
1094+
REVOKE EXECUTEON FUNCTION pg_current_logfile()FROM public;
1095+
REVOKE EXECUTEON FUNCTION pg_current_logfile(text)FROM public;
10941096

10951097
REVOKE EXECUTEON FUNCTION pg_stat_reset()FROM public;
10961098
REVOKE EXECUTEON FUNCTION pg_stat_reset_shared(text)FROM public;

‎src/backend/postmaster/postmaster.c

Lines changed: 7 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1232,6 +1232,13 @@ PostmasterMain(int argc, char *argv[])
12321232
*/
12331233
RemovePromoteSignalFiles();
12341234

1235+
/* Remove any outdated file holding the current log filenames. */
1236+
if (unlink(LOG_METAINFO_DATAFILE)<0&&errno!=ENOENT)
1237+
ereport(LOG,
1238+
(errcode_for_file_access(),
1239+
errmsg("could not remove file \"%s\": %m",
1240+
LOG_METAINFO_DATAFILE)));
1241+
12351242
/*
12361243
* If enabled, start up syslogger collection subprocess
12371244
*/

‎src/backend/postmaster/syslogger.c

Lines changed: 79 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -146,6 +146,7 @@ static char *logfile_getname(pg_time_t timestamp, const char *suffix);
146146
staticvoidset_next_rotation_time(void);
147147
staticvoidsigHupHandler(SIGNAL_ARGS);
148148
staticvoidsigUsr1Handler(SIGNAL_ARGS);
149+
staticvoidupdate_metainfo_datafile(void);
149150

150151

151152
/*
@@ -282,6 +283,7 @@ SysLoggerMain(int argc, char *argv[])
282283
currentLogRotationAge=Log_RotationAge;
283284
/* set next planned rotation time */
284285
set_next_rotation_time();
286+
update_metainfo_datafile();
285287

286288
/* main worker loop */
287289
for (;;)
@@ -348,6 +350,13 @@ SysLoggerMain(int argc, char *argv[])
348350
rotation_disabled= false;
349351
rotation_requested= true;
350352
}
353+
354+
/*
355+
* Force rewriting last log filename when reloading configuration.
356+
* Even if rotation_requested is false, log_destination may have
357+
* been changed and we don't want to wait the next file rotation.
358+
*/
359+
update_metainfo_datafile();
351360
}
352361

353362
if (Log_RotationAge>0&& !rotation_disabled)
@@ -1098,6 +1107,8 @@ open_csvlogfile(void)
10981107
pfree(last_csv_file_name);
10991108

11001109
last_csv_file_name=filename;
1110+
1111+
update_metainfo_datafile();
11011112
}
11021113

11031114
/*
@@ -1268,6 +1279,8 @@ logfile_rotate(bool time_based_rotation, int size_rotation_for)
12681279
if (csvfilename)
12691280
pfree(csvfilename);
12701281

1282+
update_metainfo_datafile();
1283+
12711284
set_next_rotation_time();
12721285
}
12731286

@@ -1337,6 +1350,72 @@ set_next_rotation_time(void)
13371350
next_rotation_time=now;
13381351
}
13391352

1353+
/*
1354+
* Store the name of the file(s) where the log collector, when enabled, writes
1355+
* log messages. Useful for finding the name(s) of the current log file(s)
1356+
* when there is time-based logfile rotation. Filenames are stored in a
1357+
* temporary file and which is renamed into the final destination for
1358+
* atomicity.
1359+
*/
1360+
staticvoid
1361+
update_metainfo_datafile(void)
1362+
{
1363+
FILE*fh;
1364+
1365+
if (!(Log_destination&LOG_DESTINATION_STDERR)&&
1366+
!(Log_destination&LOG_DESTINATION_CSVLOG))
1367+
{
1368+
if (unlink(LOG_METAINFO_DATAFILE)<0&&errno!=ENOENT)
1369+
ereport(LOG,
1370+
(errcode_for_file_access(),
1371+
errmsg("could not remove file \"%s\": %m",
1372+
LOG_METAINFO_DATAFILE)));
1373+
return;
1374+
}
1375+
1376+
if ((fh=logfile_open(LOG_METAINFO_DATAFILE_TMP,"w", true))==NULL)
1377+
{
1378+
ereport(LOG,
1379+
(errcode_for_file_access(),
1380+
errmsg("could not open file \"%s\": %m",
1381+
LOG_METAINFO_DATAFILE_TMP)));
1382+
return;
1383+
}
1384+
1385+
if (last_file_name&& (Log_destination&LOG_DESTINATION_STDERR))
1386+
{
1387+
if (fprintf(fh,"stderr %s\n",last_file_name)<0)
1388+
{
1389+
ereport(LOG,
1390+
(errcode_for_file_access(),
1391+
errmsg("could not write file \"%s\": %m",
1392+
LOG_METAINFO_DATAFILE_TMP)));
1393+
fclose(fh);
1394+
return;
1395+
}
1396+
}
1397+
1398+
if (last_csv_file_name&& (Log_destination&LOG_DESTINATION_CSVLOG))
1399+
{
1400+
if (fprintf(fh,"csvlog %s\n",last_csv_file_name)<0)
1401+
{
1402+
ereport(LOG,
1403+
(errcode_for_file_access(),
1404+
errmsg("could not write file \"%s\": %m",
1405+
LOG_METAINFO_DATAFILE_TMP)));
1406+
fclose(fh);
1407+
return;
1408+
}
1409+
}
1410+
fclose(fh);
1411+
1412+
if (rename(LOG_METAINFO_DATAFILE_TMP,LOG_METAINFO_DATAFILE)!=0)
1413+
ereport(LOG,
1414+
(errcode_for_file_access(),
1415+
errmsg("could not rename file \"%s\" to \"%s\": %m",
1416+
LOG_METAINFO_DATAFILE_TMP,LOG_METAINFO_DATAFILE)));
1417+
}
1418+
13401419
/* --------------------------------
13411420
*signal handler routines
13421421
* --------------------------------

‎src/backend/replication/basebackup.c

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -26,6 +26,7 @@
2626
#include"nodes/pg_list.h"
2727
#include"pgtar.h"
2828
#include"pgstat.h"
29+
#include"postmaster/syslogger.h"
2930
#include"replication/basebackup.h"
3031
#include"replication/walsender.h"
3132
#include"replication/walsender_private.h"
@@ -147,6 +148,9 @@ static const char *excludeFiles[] =
147148
/* Skip auto conf temporary file. */
148149
PG_AUTOCONF_FILENAME".tmp",
149150

151+
/* Skip current log file temporary file */
152+
LOG_METAINFO_DATAFILE_TMP,
153+
150154
/*
151155
* If there's a backup_label or tablespace_map file, it belongs to a
152156
* backup started by the user with pg_start_backup(). It is *not* correct

‎src/backend/utils/adt/misc.c

Lines changed: 103 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -885,3 +885,106 @@ parse_ident(PG_FUNCTION_ARGS)
885885

886886
PG_RETURN_DATUM(makeArrayResult(astate,CurrentMemoryContext));
887887
}
888+
889+
/*
890+
* pg_current_logfile
891+
*
892+
* Report current log file used by log collector by scanning current_logfiles.
893+
*/
894+
Datum
895+
pg_current_logfile(PG_FUNCTION_ARGS)
896+
{
897+
FILE*fd;
898+
charlbuffer[MAXPGPATH];
899+
char*logfmt;
900+
char*log_filepath;
901+
char*log_format=lbuffer;
902+
char*nlpos;
903+
904+
/* The log format parameter is optional */
905+
if (PG_NARGS()==0||PG_ARGISNULL(0))
906+
logfmt=NULL;
907+
else
908+
{
909+
logfmt=text_to_cstring(PG_GETARG_TEXT_PP(0));
910+
911+
if (strcmp(logfmt,"stderr")!=0&&strcmp(logfmt,"csvlog")!=0)
912+
ereport(ERROR,
913+
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
914+
errmsg("log format \"%s\" is not supported",logfmt),
915+
errhint("The supported log formats are \"stderr\" and \"csvlog\".")));
916+
}
917+
918+
fd=AllocateFile(LOG_METAINFO_DATAFILE,"r");
919+
if (fd==NULL)
920+
{
921+
if (errno!=ENOENT)
922+
ereport(ERROR,
923+
(errcode_for_file_access(),
924+
errmsg("could not read file \"%s\": %m",
925+
LOG_METAINFO_DATAFILE)));
926+
PG_RETURN_NULL();
927+
}
928+
929+
/*
930+
* Read the file to gather current log filename(s) registered by the
931+
* syslogger.
932+
*/
933+
while (fgets(lbuffer,sizeof(lbuffer),fd)!=NULL)
934+
{
935+
/*
936+
* Extract log format and log file path from the line; lbuffer ==
937+
* log_format, they share storage.
938+
*/
939+
log_filepath=strchr(lbuffer,' ');
940+
if (log_filepath==NULL)
941+
{
942+
/*
943+
* No space found, file content is corrupted. Return NULL to the
944+
* caller and inform him on the situation.
945+
*/
946+
elog(ERROR,
947+
"missing space character in \"%s\"",LOG_METAINFO_DATAFILE);
948+
break;
949+
}
950+
951+
*log_filepath='\0';
952+
log_filepath++;
953+
nlpos=strchr(log_filepath,'\n');
954+
if (nlpos==NULL)
955+
{
956+
/*
957+
* No newlinei found, file content is corrupted. Return NULL to
958+
* the caller and inform him on the situation.
959+
*/
960+
elog(ERROR,
961+
"missing newline character in \"%s\"",LOG_METAINFO_DATAFILE);
962+
break;
963+
}
964+
*nlpos='\0';
965+
966+
if (logfmt==NULL||strcmp(logfmt,log_format)==0)
967+
{
968+
FreeFile(fd);
969+
PG_RETURN_TEXT_P(cstring_to_text(log_filepath));
970+
}
971+
}
972+
973+
/* Close the current log filename file. */
974+
FreeFile(fd);
975+
976+
PG_RETURN_NULL();
977+
}
978+
979+
/*
980+
* Report current log file used by log collector (1 argument version)
981+
*
982+
* note: this wrapper is necessary to pass the sanity check in opr_sanity,
983+
* which checks that all built-in functions that share the implementing C
984+
* function take the same number of arguments
985+
*/
986+
Datum
987+
pg_current_logfile_1arg(PG_FUNCTION_ARGS)
988+
{
989+
returnpg_current_logfile(fcinfo);
990+
}

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