/*-------------------------------------------------------------------------
*
* pg_xlogdump.c - decode and display WAL
*
* Copyright (c) 2013-2015, PostgreSQL Global Development Group
*
* IDENTIFICATION
* contrib/pg_xlogdump/pg_xlogdump.c
*-------------------------------------------------------------------------
*/
#define FRONTEND 1
#include "postgres.h"
#include <dirent.h>
#include <unistd.h>
#include "access/xlogreader.h"
#include "access/xlogrecord.h"
#include "access/xlog_internal.h"
#include "access/transam.h"
#include "common/fe_memutils.h"
#include "getopt_long.h"
#include "rmgrdesc.h"
static const char *progname;
typedef struct XLogDumpPrivate
{
TimeLineID timeline;
char *inpath;
XLogRecPtr startptr;
XLogRecPtr endptr;
bool endptr_reached;
} XLogDumpPrivate;
typedef struct XLogDumpConfig
{
/* display options */
bool bkp_details;
int stop_after_records;
int already_displayed_records;
bool follow;
bool stats;
bool stats_per_record;
/* filter options */
int filter_by_rmgr;
TransactionId filter_by_xid;
bool filter_by_xid_enabled;
} XLogDumpConfig;
typedef struct Stats
{
uint64 count;
uint64 rec_len;
uint64 fpi_len;
} Stats;
#define MAX_XLINFO_TYPES 16
typedef struct XLogDumpStats
{
uint64 count;
Stats rmgr_stats[RM_NEXT_ID];
Stats record_stats[RM_NEXT_ID][MAX_XLINFO_TYPES];
} XLogDumpStats;
static void
fatal_error(const char *fmt,...)
__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
/*
* Big red button to push when things go horribly wrong.
*/
static void
fatal_error(const char *fmt,...)
{
va_list args;
fflush(stdout);
fprintf(stderr, "%s: FATAL: ", progname);
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
fputc('\n', stderr);
exit(EXIT_FAILURE);
}
static void
print_rmgr_list(void)
{
int i;
for (i = 0; i <= RM_MAX_ID; i++)
{
printf("%s\n", RmgrDescTable[i].rm_name);
}
}
/*
* Check whether directory exists and whether we can open it. Keep errno set so
* that the caller can report errors somewhat more accurately.
*/
static bool
verify_directory(const char *directory)
{
DIR *dir = opendir(directory);
if (dir == NULL)
return false;
closedir(dir);
return true;
}
/*
* Split a pathname as dirname(1) and basename(1) would.
*
* XXX this probably doesn't do very well on Windows. We probably need to
* apply canonicalize_path(), at the very least.
*/
static void
split_path(const char *path, char **dir, char **fname)
{
char *sep;
/* split filepath into directory & filename */
sep = strrchr(path, '/');
/* directory path */
if (sep != NULL)
{
*dir = pg_strdup(path);
(*dir)[(sep - path) + 1] = '\0'; /* no strndup */
*fname = pg_strdup(sep + 1);
}
/* local directory */
else
{
*dir = NULL;
*fname = pg_strdup(path);
}
}
/*
* Try to find the file in several places:
* if directory == NULL:
* fname
* XLOGDIR / fname
* $PGDATA / XLOGDIR / fname
* else
* directory / fname
* directory / XLOGDIR / fname
*
* return a read only fd
*/
static int
fuzzy_open_file(const char *directory, const char *fname)
{
int fd = -1;
char fpath[MAXPGPATH];
if (directory == NULL)
{
const char *datadir;
/* fname */
fd = open(fname, O_RDONLY | PG_BINARY, 0);
if (fd < 0 && errno != ENOENT)
return -1;
else if (fd >= 0)
return fd;
/* XLOGDIR / fname */
snprintf(fpath, MAXPGPATH, "%s/%s",
XLOGDIR, fname);
fd = open(fpath, O_RDONLY | PG_BINARY, 0);
if (fd < 0 && errno != ENOENT)
return -1;
else if (fd >= 0)
return fd;
datadir = getenv("PGDATA");
/* $PGDATA / XLOGDIR / fname */
if (datadir != NULL)
{
snprintf(fpath, MAXPGPATH, "%s/%s/%s",
datadir, XLOGDIR, fname);
fd = open(fpath, O_RDONLY | PG_BINARY, 0);
if (fd < 0 && errno != ENOENT)
return -1;
else if (fd >= 0)
return fd;
}
}
else
{
/* directory / fname */
snprintf(fpath, MAXPGPATH, "%s/%s",
directory, fname);
fd = open(fpath, O_RDONLY | PG_BINARY, 0);
if (fd < 0 && errno != ENOENT)
return -1;
else if (fd >= 0)
return fd;
/* directory / XLOGDIR / fname */
snprintf(fpath, MAXPGPATH, "%s/%s/%s",
directory, XLOGDIR, fname);
fd = open(fpath, O_RDONLY | PG_BINARY, 0);
if (fd < 0 && errno != ENOENT)
return -1;
else if (fd >= 0)
return fd;
}
return -1;
}
/*
* Read count bytes from a segment file in the specified directory, for the
* given timeline, containing the specified record pointer; store the data in
* the passed buffer.
*/
static void
XLogDumpXLogRead(const char *directory, TimeLineID timeline_id,
XLogRecPtr startptr, char *buf, Size count)
{
char *p;
XLogRecPtr recptr;
Size nbytes;
static int sendFile = -1;
static XLogSegNo sendSegNo = 0;
static uint32 sendOff = 0;
p = buf;
recptr = startptr;
nbytes = count;
while (nbytes > 0)
{
uint32 startoff;
int segbytes;
int readbytes;
startoff = recptr % XLogSegSize;
if (sendFile < 0 || !XLByteInSeg(recptr, sendSegNo))
{
char fname[MAXFNAMELEN];
/* Switch to another logfile segment */
if (sendFile >= 0)
close(sendFile);
XLByteToSeg(recptr, sendSegNo);
XLogFileName(fname, timeline_id, sendSegNo);
sendFile = fuzzy_open_file(directory, fname);
if (sendFile < 0)
fatal_error("could not find file \"%s\": %s",
fname, strerror(errno));
sendOff = 0;
}
/* Need to seek in the file? */
if (sendOff != startoff)
{
if (lseek(sendFile, (off_t) startoff, SEEK_SET) < 0)
{
int err = errno;
char fname[MAXPGPATH];
XLogFileName(fname, timeline_id, sendSegNo);
fatal_error("could not seek in log segment %s to offset %u: %s",
fname, startoff, strerror(err));
}
sendOff = startoff;
}
/* How many bytes are within this segment? */
if (nbytes > (XLogSegSize - startoff))
segbytes = XLogSegSize - startoff;
else
segbytes = nbytes;
readbytes = read(sendFile, p, segbytes);
if (readbytes <= 0)
{
int err = errno;
char fname[MAXPGPATH];
XLogFileName(fname, timeline_id, sendSegNo);
fatal_error("could not read from log segment %s, offset %d, length %d: %s",
fname, sendOff, segbytes, strerror(err));
}
/* Update state for read */
recptr += readbytes;
sendOff += readbytes;
nbytes -= readbytes;
p += readbytes;
}
}
/*
* XLogReader read_page callback
*/
static int
XLogDumpReadPage(XLogReaderState *state, XLogRecPtr targetPagePtr, int reqLen,
XLogRecPtr targetPtr, char *readBuff, TimeLineID *curFileTLI)
{
XLogDumpPrivate *private = state->private_data;
int count = XLOG_BLCKSZ;
if (private->endptr != InvalidXLogRecPtr)
{
if (targetPagePtr + XLOG_BLCKSZ <= private->endptr)
count = XLOG_BLCKSZ;
else if (targetPagePtr + reqLen <= private->endptr)
count = private->endptr - targetPagePtr;
else
{
private->endptr_reached = true;
return -1;
}
}
XLogDumpXLogRead(private->inpath, private->timeline, targetPagePtr,
readBuff, count);
return count;
}
/*
* Store per-rmgr and per-record statistics for a given record.
*/
static void
XLogDumpCountRecord(XLogDumpConfig *config, XLogDumpStats *stats,
XLogReaderState *record)
{
RmgrId rmid;
uint8 recid;
uint32 rec_len;
uint32 fpi_len;
int block_id;
stats->count++;
rmid = XLogRecGetRmid(record);
rec_len = XLogRecGetDataLen(record) + SizeOfXLogRecord;
/*
* Calculate the amount of FPI data in the record. Each backup block
* takes up BLCKSZ bytes, minus the "hole" length.
*
* XXX: We peek into xlogreader's private decoded backup blocks for the
* hole_length. It doesn't seem worth it to add an accessor macro for
* this.
*/
fpi_len = 0;
for (block_id = 0; block_id <= record->max_block_id; block_id++)
{
if (XLogRecHasBlockImage(record, block_id))
fpi_len += BLCKSZ - record->blocks[block_id].hole_length;
}
/* Update per-rmgr statistics */
stats->rmgr_stats[rmid].count++;
stats->rmgr_stats[rmid].rec_len += rec_len;
stats->rmgr_stats[rmid].fpi_len += fpi_len;
/*
* Update per-record statistics, where the record is identified by a
* combination of the RmgrId and the four bits of the xl_info field that
* are the rmgr's domain (resulting in sixteen possible entries per
* RmgrId).
*/
recid = XLogRecGetInfo(record) >> 4;
stats->record_stats[rmid][recid].count++;
stats->record_stats[rmid][recid].rec_len += rec_len;
stats->record_stats[rmid][recid].fpi_len += fpi_len;
}
/*
* Print a record to stdout
*/
static void
XLogDumpDisplayRecord(XLogDumpConfig *config, XLogReaderState *record)
{
const char *id;
const RmgrDescData *desc = &RmgrDescTable[XLogRecGetRmid(record)];
RelFileNode rnode;
ForkNumber forknum;
BlockNumber blk;
int block_id;
uint8 info = XLogRecGetInfo(record);
XLogRecPtr xl_prev = XLogRecGetPrev(record);
id = desc->rm_identify(info);
if (id == NULL)
id = psprintf("UNKNOWN (%x)", info & ~XLR_INFO_MASK);
printf("rmgr: %-11s len (rec/tot): %6u/%6u, tx: %10u, lsn: %X/%08X, prev %X/%08X, ",
desc->rm_name,
XLogRecGetDataLen(record), XLogRecGetTotalLen(record),
XLogRecGetXid(record),
(uint32) (record->ReadRecPtr >> 32), (uint32) record->ReadRecPtr,
(uint32) (xl_prev >> 32), (uint32) xl_prev);
printf("desc: %s ", id);
/* the desc routine will printf the description directly to stdout */
desc->rm_desc(NULL, record);
if (!config->bkp_details)
{
/* print block references (short format) */
for (block_id = 0; block_id <= record->max_block_id; block_id++)
{
if (!XLogRecHasBlockRef(record, block_id))
continue;
XLogRecGetBlockTag(record, block_id, &rnode, &forknum, &blk);
if (forknum != MAIN_FORKNUM)
printf(", blkref #%u: rel %u/%u/%u fork %s blk %u",
block_id,
rnode.spcNode, rnode.dbNode, rnode.relNode,
forkNames[forknum],
blk);
else
printf(", blkref #%u: rel %u/%u/%u blk %u",
block_id,
rnode.spcNode, rnode.dbNode, rnode.relNode,
blk);
if (XLogRecHasBlockImage(record, block_id))
printf(" FPW");
}
putchar('\n');
}
else
{
/* print block references (detailed format) */
putchar('\n');
for (block_id = 0; block_id <= record->max_block_id; block_id++)
{
if (!XLogRecHasBlockRef(record, block_id))
continue;
XLogRecGetBlockTag(record, block_id, &rnode, &forknum, &blk);
printf("\tblkref #%u: rel %u/%u/%u fork %s blk %u",
block_id,
rnode.spcNode, rnode.dbNode, rnode.relNode,
forkNames[forknum],
blk);
if (XLogRecHasBlockImage(record, block_id))
{
printf(" (FPW); hole: offset: %u, length: %u\n",
record->blocks[block_id].hole_offset,
record->blocks[block_id].hole_length);
}
putchar('\n');
}
}
}
/*
* Display a single row of record counts and sizes for an rmgr or record.
*/
static void
XLogDumpStatsRow(const char *name,
uint64 n, double n_pct,
uint64 rec_len, double rec_len_pct,
uint64 fpi_len, double fpi_len_pct,
uint64 total_len, double total_len_pct)
{
printf("%-27s "
"%20" INT64_MODIFIER "u (%6.02f) "
"%20" INT64_MODIFIER "u (%6.02f) "
"%20" INT64_MODIFIER "u (%6.02f) "
"%20" INT64_MODIFIER "u (%6.02f)\n",
name, n, n_pct, rec_len, rec_len_pct, fpi_len, fpi_len_pct,
total_len, total_len_pct);
}
/*
* Display summary statistics about the records seen so far.
*/
static void
XLogDumpDisplayStats(XLogDumpConfig *config, XLogDumpStats *stats)
{
int ri, rj;
uint64 total_count = 0;
uint64 total_rec_len = 0;
uint64 total_fpi_len = 0;
uint64 total_len = 0;
/* ---
* Make a first pass to calculate column totals:
* count(*),
* sum(xl_len+SizeOfXLogRecord),
* sum(xl_tot_len-xl_len-SizeOfXLogRecord), and
* sum(xl_tot_len).
* These are used to calculate percentages for each record type.
* ---
*/
for (ri = 0; ri < RM_NEXT_ID; ri++)
{
total_count += stats->rmgr_stats[ri].count;
total_rec_len += stats->rmgr_stats[ri].rec_len;
total_fpi_len += stats->rmgr_stats[ri].fpi_len;
}
total_len = total_rec_len+total_fpi_len;
/*
* 27 is strlen("Transaction/COMMIT_PREPARED"),
* 20 is strlen(2^64), 8 is strlen("(100.00%)")
*/
printf("%-27s %20s %8s %20s %8s %20s %8s %20s %8s\n"
"%-27s %20s %8s %20s %8s %20s %8s %20s %8s\n",
"Type", "N", "(%)", "Record size", "(%)", "FPI size", "(%)", "Combined size", "(%)",
"----", "-", "---", "-----------", "---", "--------", "---", "-------------", "---");
for (ri = 0; ri < RM_NEXT_ID; ri++)
{
uint64 count, rec_len, fpi_len, tot_len;
const RmgrDescData *desc = &RmgrDescTable[ri];
if (!config->stats_per_record)
{
count = stats->rmgr_stats[ri].count;
rec_len = stats->rmgr_stats[ri].rec_len;
fpi_len = stats->rmgr_stats[ri].fpi_len;
tot_len = rec_len + fpi_len;
XLogDumpStatsRow(desc->rm_name,
count, 100 * (double) count / total_count,
rec_len, 100 * (double) rec_len / total_rec_len,
fpi_len, 100 * (double) fpi_len / total_fpi_len,
tot_len, 100 * (double) tot_len / total_len);
}
else
{
for (rj = 0; rj < MAX_XLINFO_TYPES; rj++)
{
const char *id;
count = stats->record_stats[ri][rj].count;
rec_len = stats->record_stats[ri][rj].rec_len;
fpi_len = stats->record_stats[ri][rj].fpi_len;
tot_len = rec_len + fpi_len;
/* Skip undefined combinations and ones that didn't occur */
if (count == 0)
continue;
/* the upper four bits in xl_info are the rmgr's */
id = desc->rm_identify(rj << 4);
if (id == NULL)
id = psprintf("UNKNOWN (%x)", rj << 4);
XLogDumpStatsRow(psprintf("%s/%s", desc->rm_name, id),
count, 100 * (double) count / total_count,
rec_len, 100 * (double) rec_len / total_rec_len,
fpi_len, 100 * (double) fpi_len / total_fpi_len,
tot_len, 100 * (double) tot_len / total_len);
}
}
}
printf("%-27s %20s %8s %20s %8s %20s %8s %20s\n",
"", "--------", "", "--------", "", "--------", "", "--------");
/*
* The percentages in earlier rows were calculated against the
* column total, but the ones that follow are against the row total.
* Note that these are displayed with a % symbol to differentiate
* them from the earlier ones, and are thus up to 9 characters long.
*/
printf("%-27s "
"%20" INT64_MODIFIER "u %-9s"
"%20" INT64_MODIFIER "u %-9s"
"%20" INT64_MODIFIER "u %-9s"
"%20" INT64_MODIFIER "u %-6s\n",
"Total", stats->count, "",
total_rec_len, psprintf("[%.02f%%]", 100 * (double)total_rec_len / total_len),
total_fpi_len, psprintf("[%.02f%%]", 100 * (double)total_fpi_len / total_len),
total_len, "[100%]");
}
static void
usage(void)
{
printf("%s decodes and displays PostgreSQL transaction logs for debugging.\n\n",
progname);
printf("Usage:\n");
printf(" %s [OPTION]... [STARTSEG [ENDSEG]] \n", progname);
printf("\nOptions:\n");
printf(" -b, --bkp-details output detailed information about backup blocks\n");
printf(" -e, --end=RECPTR stop reading at log position RECPTR\n");
printf(" -f, --follow keep retrying after reaching end of WAL\n");
printf(" -n, --limit=N number of records to display\n");
printf(" -p, --path=PATH directory in which to find log segment files\n");
printf(" (default: ./pg_xlog)\n");
printf(" -r, --rmgr=RMGR only show records generated by resource manager RMGR\n");
printf(" use --rmgr=list to list valid resource manager names\n");
printf(" -s, --start=RECPTR start reading at log position RECPTR\n");
printf(" -t, --timeline=TLI timeline from which to read log records\n");
printf(" (default: 1 or the value used in STARTSEG)\n");
printf(" -V, --version output version information, then exit\n");
printf(" -x, --xid=XID only show records with TransactionId XID\n");
printf(" -z, --stats[=record] show statistics instead of records\n");
printf(" (optionally, show per-record statistics)\n");
printf(" -?, --help show this help, then exit\n");
}
int
main(int argc, char **argv)
{
uint32 xlogid;
uint32 xrecoff;
XLogReaderState *xlogreader_state;
XLogDumpPrivate private;
XLogDumpConfig config;
XLogDumpStats stats;
XLogRecord *record;
XLogRecPtr first_record;
char *errormsg;
static struct option long_options[] = {
{"bkp-details", no_argument, NULL, 'b'},
{"end", required_argument, NULL, 'e'},
{"follow", no_argument, NULL, 'f'},
{"help", no_argument, NULL, '?'},
{"limit", required_argument, NULL, 'n'},
{"path", required_argument, NULL, 'p'},
{"rmgr", required_argument, NULL, 'r'},
{"start", required_argument, NULL, 's'},
{"timeline", required_argument, NULL, 't'},
{"xid", required_argument, NULL, 'x'},
{"version", no_argument, NULL, 'V'},
{"stats", optional_argument, NULL, 'z'},
{NULL, 0, NULL, 0}
};
int option;
int optindex = 0;
progname = get_progname(argv[0]);
memset(&private, 0, sizeof(XLogDumpPrivate));
memset(&config, 0, sizeof(XLogDumpConfig));
memset(&stats, 0, sizeof(XLogDumpStats));
private.timeline = 1;
private.startptr = InvalidXLogRecPtr;
private.endptr = InvalidXLogRecPtr;
private.endptr_reached = false;
config.bkp_details = false;
config.stop_after_records = -1;
config.already_displayed_records = 0;
config.follow = false;
config.filter_by_rmgr = -1;
config.filter_by_xid = InvalidTransactionId;
config.filter_by_xid_enabled = false;
config.stats = false;
config.stats_per_record = false;
if (argc <= 1)
{
fprintf(stderr, "%s: no arguments specified\n", progname);
goto bad_argument;
}
while ((option = getopt_long(argc, argv, "be:?fn:p:r:s:t:Vx:z",
long_options, &optindex)) != -1)
{
switch (option)
{
case 'b':
config.bkp_details = true;
break;
case 'e':
if (sscanf(optarg, "%X/%X", &xlogid, &xrecoff) != 2)
{
fprintf(stderr, "%s: could not parse end log position \"%s\"\n",
progname, optarg);
goto bad_argument;
}
private.endptr = (uint64) xlogid << 32 | xrecoff;
break;
case 'f':
config.follow = true;
break;
case '?':
usage();
exit(EXIT_SUCCESS);
break;
case 'n':
if (sscanf(optarg, "%d", &config.stop_after_records) != 1)
{
fprintf(stderr, "%s: could not parse limit \"%s\"\n",
progname, optarg);
goto bad_argument;
}
break;
case 'p':
private.inpath = pg_strdup(optarg);
break;
case 'r':
{
int i;
if (pg_strcasecmp(optarg, "list") == 0)
{
print_rmgr_list();
exit(EXIT_SUCCESS);
}
for (i = 0; i <= RM_MAX_ID; i++)
{
if (pg_strcasecmp(optarg, RmgrDescTable[i].rm_name) == 0)
{
config.filter_by_rmgr = i;
break;
}
}
if (config.filter_by_rmgr == -1)
{
fprintf(stderr, "%s: resource manager \"%s\" does not exist\n",
progname, optarg);
goto bad_argument;
}
}
break;
case 's':
if (sscanf(optarg, "%X/%X", &xlogid, &xrecoff) != 2)
{
fprintf(stderr, "%s: could not parse start log position \"%s\"\n",
progname, optarg);
goto bad_argument;
}
else
private.startptr = (uint64) xlogid << 32 | xrecoff;
break;
case 't':
if (sscanf(optarg, "%d", &private.timeline) != 1)
{
fprintf(stderr, "%s: could not parse timeline \"%s\"\n",
progname, optarg);
goto bad_argument;
}
break;
case 'V':
puts("pg_xlogdump (PostgreSQL) " PG_VERSION);
exit(EXIT_SUCCESS);
break;
case 'x':
if (sscanf(optarg, "%u", &config.filter_by_xid) != 1)
{
fprintf(stderr, "%s: could not parse \"%s\" as a valid xid\n",
progname, optarg);
goto bad_argument;
}
config.filter_by_xid_enabled = true;
break;
case 'z':
config.stats = true;
config.stats_per_record = false;
if (optarg)
{
if (strcmp(optarg, "record") == 0)
config.stats_per_record = true;
else if (strcmp(optarg, "rmgr") != 0)
{
fprintf(stderr, "%s: unrecognised argument to --stats: %s\n",
progname, optarg);
goto bad_argument;
}
}
break;
default:
goto bad_argument;
}
}
if ((optind + 2) < argc)
{
fprintf(stderr,
"%s: too many command-line arguments (first is \"%s\")\n",
progname, argv[optind + 2]);
goto bad_argument;
}
if (private.inpath != NULL)
{
/* validate path points to directory */
if (!verify_directory(private.inpath))
{
fprintf(stderr,
"%s: path \"%s\" cannot be opened: %s",
progname, private.inpath, strerror(errno));
goto bad_argument;
}
}
/* parse files as start/end boundaries, extract path if not specified */
if (optind < argc)
{
char *directory = NULL;
char *fname = NULL;
int fd;
XLogSegNo segno;
split_path(argv[optind], &directory, &fname);
if (private.inpath == NULL && directory != NULL)
{
private.inpath = directory;
if (!verify_directory(private.inpath))
fatal_error("cannot open directory \"%s\": %s",
private.inpath, strerror(errno));
}
fd = fuzzy_open_file(private.inpath, fname);
if (fd < 0)
fatal_error("could not open file \"%s\"", fname);
close(fd);
/* parse position from file */
XLogFromFileName(fname, &private.timeline, &segno);
if (XLogRecPtrIsInvalid(private.startptr))
XLogSegNoOffsetToRecPtr(segno, 0, private.startptr);
else if (!XLByteInSeg(private.startptr, segno))
{
fprintf(stderr,
"%s: start log position %X/%X is not inside file \"%s\"\n",
progname,
(uint32) (private.startptr >> 32),
(uint32) private.startptr,
fname);
goto bad_argument;
}
/* no second file specified, set end position */
if (!(optind + 1 < argc) && XLogRecPtrIsInvalid(private.endptr))
XLogSegNoOffsetToRecPtr(segno + 1, 0, private.endptr);
/* parse ENDSEG if passed */
if (optind + 1 < argc)
{
XLogSegNo endsegno;
/* ignore directory, already have that */
split_path(argv[optind + 1], &directory, &fname);
fd = fuzzy_open_file(private.inpath, fname);
if (fd < 0)
fatal_error("could not open file \"%s\"", fname);
close(fd);
/* parse position from file */
XLogFromFileName(fname, &private.timeline, &endsegno);
if (endsegno < segno)
fatal_error("ENDSEG %s is before STARTSEG %s",
argv[optind + 1], argv[optind]);
if (XLogRecPtrIsInvalid(private.endptr))
XLogSegNoOffsetToRecPtr(endsegno + 1, 0, private.endptr);
/* set segno to endsegno for check of --end */
segno = endsegno;
}
if (!XLByteInSeg(private.endptr, segno) &&
private.endptr != (segno + 1) * XLogSegSize)
{
fprintf(stderr,
"%s: end log position %X/%X is not inside file \"%s\"\n",
progname,
(uint32) (private.endptr >> 32),
(uint32) private.endptr,
argv[argc - 1]);
goto bad_argument;
}
}
/* we don't know what to print */
if (XLogRecPtrIsInvalid(private.startptr))
{
fprintf(stderr, "%s: no start log position given in range mode.\n", progname);
goto bad_argument;
}
/* done with argument parsing, do the actual work */
/* we have everything we need, start reading */
xlogreader_state = XLogReaderAllocate(XLogDumpReadPage, &private);
if (!xlogreader_state)
fatal_error("out of memory");
/* first find a valid recptr to start from */
first_record = XLogFindNextRecord(xlogreader_state, private.startptr);
if (first_record == InvalidXLogRecPtr)
fatal_error("could not find a valid record after %X/%X",
(uint32) (private.startptr >> 32),
(uint32) private.startptr);
/*
* Display a message that we're skipping data if `from` wasn't a pointer
* to the start of a record and also wasn't a pointer to the beginning of
* a segment (e.g. we were used in file mode).
*/
if (first_record != private.startptr && (private.startptr % XLogSegSize) != 0)
printf("first record is after %X/%X, at %X/%X, skipping over %u bytes\n",
(uint32) (private.startptr >> 32), (uint32) private.startptr,
(uint32) (first_record >> 32), (uint32) first_record,
(uint32) (first_record - private.startptr));
for (;;)
{
/* try to read the next record */
record = XLogReadRecord(xlogreader_state, first_record, &errormsg);
if (!record)
{
if (!config.follow || private.endptr_reached)
break;
else
{
pg_usleep(1000000L); /* 1 second */
continue;
}
}
/* after reading the first record, continue at next one */
first_record = InvalidXLogRecPtr;
/* apply all specified filters */
if (config.filter_by_rmgr != -1 &&
config.filter_by_rmgr != record->xl_rmid)
continue;
if (config.filter_by_xid_enabled &&
config.filter_by_xid != record->xl_xid)
continue;
/* process the record */
if (config.stats == true)
XLogDumpCountRecord(&config, &stats, xlogreader_state);
else
XLogDumpDisplayRecord(&config, xlogreader_state);
/* check whether we printed enough */
config.already_displayed_records++;
if (config.stop_after_records > 0 &&
config.already_displayed_records >= config.stop_after_records)
break;
}
if (config.stats == true)
XLogDumpDisplayStats(&config, &stats);
if (errormsg)
fatal_error("error in WAL record at %X/%X: %s\n",
(uint32) (xlogreader_state->ReadRecPtr >> 32),
(uint32) xlogreader_state->ReadRecPtr,
errormsg);
XLogReaderFree(xlogreader_state);
return EXIT_SUCCESS;
bad_argument:
fprintf(stderr, "Try \"%s --help\" for more information.\n", progname);
return EXIT_FAILURE;
}