mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-12-21 08:29:39 +08:00
26b45dc54f
Fujii Masao and me.
712 lines
17 KiB
C
712 lines
17 KiB
C
/*-------------------------------------------------------------------------
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*
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* pg_xlogdump.c - decode and display WAL
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*
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* Copyright (c) 2013, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* contrib/pg_xlogdump/pg_xlogdump.c
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*-------------------------------------------------------------------------
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*/
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#define FRONTEND 1
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#include "postgres.h"
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#include <dirent.h>
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#include <unistd.h>
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#include "access/xlog.h"
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#include "access/xlogreader.h"
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#include "access/transam.h"
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#include "common/fe_memutils.h"
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#include "common/relpath.h"
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#include "getopt_long.h"
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#include "rmgrdesc.h"
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static const char *progname;
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typedef struct XLogDumpPrivate
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{
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TimeLineID timeline;
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char *inpath;
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XLogRecPtr startptr;
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XLogRecPtr endptr;
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} XLogDumpPrivate;
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typedef struct XLogDumpConfig
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{
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/* display options */
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bool bkp_details;
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int stop_after_records;
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int already_displayed_records;
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/* filter options */
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int filter_by_rmgr;
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TransactionId filter_by_xid;
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bool filter_by_xid_enabled;
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} XLogDumpConfig;
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static void
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fatal_error(const char *fmt,...)
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__attribute__((format(PG_PRINTF_ATTRIBUTE, 1, 2)));
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/*
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* Big red button to push when things go horribly wrong.
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*/
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static void
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fatal_error(const char *fmt,...)
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{
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va_list args;
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fflush(stdout);
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fprintf(stderr, "%s: FATAL: ", progname);
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va_start(args, fmt);
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vfprintf(stderr, fmt, args);
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va_end(args);
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fputc('\n', stderr);
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exit(EXIT_FAILURE);
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}
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static void
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print_rmgr_list(void)
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{
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int i;
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for (i = 0; i < RM_MAX_ID + 1; i++)
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{
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printf("%s\n", RmgrDescTable[i].rm_name);
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}
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}
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/*
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* Check whether directory exists and whether we can open it. Keep errno set so
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* that the caller can report errors somewhat more accurately.
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*/
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static bool
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verify_directory(const char *directory)
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{
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DIR *dir = opendir(directory);
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if (dir == NULL)
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return false;
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closedir(dir);
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return true;
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}
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/*
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* Split a pathname as dirname(1) and basename(1) would.
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*
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* XXX this probably doesn't do very well on Windows. We probably need to
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* apply canonicalize_path(), at the very least.
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*/
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static void
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split_path(const char *path, char **dir, char **fname)
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{
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char *sep;
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/* split filepath into directory & filename */
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sep = strrchr(path, '/');
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/* directory path */
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if (sep != NULL)
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{
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*dir = pg_strdup(path);
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(*dir)[(sep - path) + 1] = '\0'; /* no strndup */
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*fname = pg_strdup(sep + 1);
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}
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/* local directory */
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else
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{
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*dir = NULL;
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*fname = pg_strdup(path);
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}
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}
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/*
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* Try to find the file in several places:
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* if directory == NULL:
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* fname
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* XLOGDIR / fname
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* $PGDATA / XLOGDIR / fname
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* else
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* directory / fname
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* directory / XLOGDIR / fname
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*
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* return a read only fd
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*/
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static int
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fuzzy_open_file(const char *directory, const char *fname)
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{
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int fd = -1;
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char fpath[MAXPGPATH];
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if (directory == NULL)
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{
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const char *datadir;
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/* fname */
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fd = open(fname, O_RDONLY | PG_BINARY, 0);
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if (fd < 0 && errno != ENOENT)
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return -1;
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else if (fd > 0)
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return fd;
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/* XLOGDIR / fname */
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snprintf(fpath, MAXPGPATH, "%s/%s",
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XLOGDIR, fname);
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fd = open(fpath, O_RDONLY | PG_BINARY, 0);
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if (fd < 0 && errno != ENOENT)
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return -1;
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else if (fd > 0)
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return fd;
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datadir = getenv("PGDATA");
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/* $PGDATA / XLOGDIR / fname */
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if (datadir != NULL)
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{
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snprintf(fpath, MAXPGPATH, "%s/%s/%s",
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datadir, XLOGDIR, fname);
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fd = open(fpath, O_RDONLY | PG_BINARY, 0);
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if (fd < 0 && errno != ENOENT)
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return -1;
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else if (fd > 0)
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return fd;
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}
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}
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else
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{
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/* directory / fname */
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snprintf(fpath, MAXPGPATH, "%s/%s",
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directory, fname);
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fd = open(fpath, O_RDONLY | PG_BINARY, 0);
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if (fd < 0 && errno != ENOENT)
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return -1;
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else if (fd > 0)
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return fd;
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/* directory / XLOGDIR / fname */
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snprintf(fpath, MAXPGPATH, "%s/%s/%s",
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directory, XLOGDIR, fname);
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fd = open(fpath, O_RDONLY | PG_BINARY, 0);
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if (fd < 0 && errno != ENOENT)
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return -1;
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else if (fd > 0)
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return fd;
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}
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return -1;
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}
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/*
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* Read count bytes from a segment file in the specified directory, for the
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* given timeline, containing the specified record pointer; store the data in
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* the passed buffer.
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*/
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static void
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XLogDumpXLogRead(const char *directory, TimeLineID timeline_id,
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XLogRecPtr startptr, char *buf, Size count)
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{
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char *p;
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XLogRecPtr recptr;
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Size nbytes;
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static int sendFile = -1;
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static XLogSegNo sendSegNo = 0;
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static uint32 sendOff = 0;
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p = buf;
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recptr = startptr;
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nbytes = count;
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while (nbytes > 0)
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{
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uint32 startoff;
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int segbytes;
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int readbytes;
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startoff = recptr % XLogSegSize;
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if (sendFile < 0 || !XLByteInSeg(recptr, sendSegNo))
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{
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char fname[MAXFNAMELEN];
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/* Switch to another logfile segment */
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if (sendFile >= 0)
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close(sendFile);
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XLByteToSeg(recptr, sendSegNo);
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XLogFileName(fname, timeline_id, sendSegNo);
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sendFile = fuzzy_open_file(directory, fname);
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if (sendFile < 0)
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fatal_error("could not find file \"%s\": %s",
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fname, strerror(errno));
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sendOff = 0;
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}
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/* Need to seek in the file? */
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if (sendOff != startoff)
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{
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if (lseek(sendFile, (off_t) startoff, SEEK_SET) < 0)
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{
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int err = errno;
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char fname[MAXPGPATH];
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XLogFileName(fname, timeline_id, sendSegNo);
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fatal_error("could not seek in log segment %s to offset %u: %s",
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fname, startoff, strerror(err));
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}
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sendOff = startoff;
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}
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/* How many bytes are within this segment? */
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if (nbytes > (XLogSegSize - startoff))
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segbytes = XLogSegSize - startoff;
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else
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segbytes = nbytes;
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readbytes = read(sendFile, p, segbytes);
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if (readbytes <= 0)
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{
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int err = errno;
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char fname[MAXPGPATH];
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XLogFileName(fname, timeline_id, sendSegNo);
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fatal_error("could not read from log segment %s, offset %d, length %d: %s",
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fname, sendOff, segbytes, strerror(err));
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}
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/* Update state for read */
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recptr += readbytes;
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sendOff += readbytes;
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nbytes -= readbytes;
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p += readbytes;
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}
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}
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/*
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* XLogReader read_page callback
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*/
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static int
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XLogDumpReadPage(XLogReaderState *state, XLogRecPtr targetPagePtr, int reqLen,
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XLogRecPtr targetPtr, char *readBuff, TimeLineID *curFileTLI)
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{
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XLogDumpPrivate *private = state->private_data;
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int count = XLOG_BLCKSZ;
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if (private->endptr != InvalidXLogRecPtr)
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{
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if (targetPagePtr + XLOG_BLCKSZ <= private->endptr)
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count = XLOG_BLCKSZ;
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else if (targetPagePtr + reqLen <= private->endptr)
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count = private->endptr - targetPagePtr;
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else
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return -1;
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}
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XLogDumpXLogRead(private->inpath, private->timeline, targetPagePtr,
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readBuff, count);
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return count;
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}
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/*
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* Print a record to stdout
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*/
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static void
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XLogDumpDisplayRecord(XLogDumpConfig *config, XLogRecPtr ReadRecPtr, XLogRecord *record)
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{
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const RmgrDescData *desc = &RmgrDescTable[record->xl_rmid];
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if (config->filter_by_rmgr != -1 &&
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config->filter_by_rmgr != record->xl_rmid)
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return;
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if (config->filter_by_xid_enabled &&
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config->filter_by_xid != record->xl_xid)
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return;
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config->already_displayed_records++;
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printf("rmgr: %-11s len (rec/tot): %6u/%6u, tx: %10u, lsn: %X/%08X, prev %X/%08X, bkp: %u%u%u%u, desc: ",
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desc->rm_name,
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record->xl_len, record->xl_tot_len,
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record->xl_xid,
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(uint32) (ReadRecPtr >> 32), (uint32) ReadRecPtr,
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(uint32) (record->xl_prev >> 32), (uint32) record->xl_prev,
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!!(XLR_BKP_BLOCK(0) & record->xl_info),
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!!(XLR_BKP_BLOCK(1) & record->xl_info),
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!!(XLR_BKP_BLOCK(2) & record->xl_info),
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!!(XLR_BKP_BLOCK(3) & record->xl_info));
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/* the desc routine will printf the description directly to stdout */
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desc->rm_desc(NULL, record->xl_info, XLogRecGetData(record));
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putchar('\n');
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if (config->bkp_details)
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{
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int bkpnum;
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char *blk = (char *) XLogRecGetData(record) + record->xl_len;
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for (bkpnum = 0; bkpnum < XLR_MAX_BKP_BLOCKS; bkpnum++)
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{
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BkpBlock bkpb;
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if (!(XLR_BKP_BLOCK(bkpnum) & record->xl_info))
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continue;
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memcpy(&bkpb, blk, sizeof(BkpBlock));
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blk += sizeof(BkpBlock);
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blk += BLCKSZ - bkpb.hole_length;
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printf("\tbackup bkp #%u; rel %u/%u/%u; fork: %s; block: %u; hole: offset: %u, length: %u\n",
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bkpnum,
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bkpb.node.spcNode, bkpb.node.dbNode, bkpb.node.relNode,
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forkNames[bkpb.fork],
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bkpb.block, bkpb.hole_offset, bkpb.hole_length);
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}
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}
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}
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static void
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usage(void)
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{
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printf("%s decodes and displays PostgreSQL transaction logs for debugging.\n\n",
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progname);
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printf("Usage:\n");
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printf(" %s [OPTION] [STARTSEG [ENDSEG]] \n", progname);
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printf("\nGeneral options:\n");
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printf(" -V, --version output version information, then exit\n");
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printf(" -?, --help show this help, then exit\n");
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printf("\nContent options:\n");
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printf(" -b, --bkp-details output detailed information about backup blocks\n");
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printf(" -e, --end=RECPTR stop reading at log position RECPTR\n");
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printf(" -n, --limit=N number of records to display\n");
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printf(" -p, --path=PATH directory in which to find log segment files\n");
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printf(" (default: ./pg_xlog)\n");
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printf(" -r, --rmgr=RMGR only show records generated by resource manager RMGR\n");
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printf(" use --rmgr=list to list valid resource manager names\n");
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printf(" -s, --start=RECPTR start reading at log position RECPTR\n");
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printf(" -t, --timeline=TLI timeline from which to read log records\n");
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printf(" (default: 1 or the value used in STARTSEG)\n");
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printf(" -x, --xid=XID only show records with TransactionId XID\n");
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}
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int
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main(int argc, char **argv)
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{
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uint32 xlogid;
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uint32 xrecoff;
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XLogReaderState *xlogreader_state;
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XLogDumpPrivate private;
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XLogDumpConfig config;
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XLogRecord *record;
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XLogRecPtr first_record;
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char *errormsg;
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static struct option long_options[] = {
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{"bkp-details", no_argument, NULL, 'b'},
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{"end", required_argument, NULL, 'e'},
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{"help", no_argument, NULL, '?'},
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{"limit", required_argument, NULL, 'n'},
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{"path", required_argument, NULL, 'p'},
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{"rmgr", required_argument, NULL, 'r'},
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{"start", required_argument, NULL, 's'},
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{"timeline", required_argument, NULL, 't'},
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{"xid", required_argument, NULL, 'x'},
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{"version", no_argument, NULL, 'V'},
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{NULL, 0, NULL, 0}
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};
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int option;
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int optindex = 0;
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progname = get_progname(argv[0]);
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memset(&private, 0, sizeof(XLogDumpPrivate));
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memset(&config, 0, sizeof(XLogDumpConfig));
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private.timeline = 1;
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private.startptr = InvalidXLogRecPtr;
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private.endptr = InvalidXLogRecPtr;
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config.bkp_details = false;
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config.stop_after_records = -1;
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config.already_displayed_records = 0;
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config.filter_by_rmgr = -1;
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config.filter_by_xid = InvalidTransactionId;
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config.filter_by_xid_enabled = false;
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if (argc <= 1)
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{
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fprintf(stderr, "%s: no arguments specified\n", progname);
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goto bad_argument;
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}
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while ((option = getopt_long(argc, argv, "be:?n:p:r:s:t:Vx:",
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long_options, &optindex)) != -1)
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{
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switch (option)
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{
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case 'b':
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config.bkp_details = true;
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break;
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case 'e':
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if (sscanf(optarg, "%X/%X", &xlogid, &xrecoff) != 2)
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{
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fprintf(stderr, "%s: could not parse end log position \"%s\"\n",
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progname, optarg);
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goto bad_argument;
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}
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private.endptr = (uint64) xlogid << 32 | xrecoff;
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break;
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case '?':
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usage();
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exit(EXIT_SUCCESS);
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break;
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case 'n':
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if (sscanf(optarg, "%d", &config.stop_after_records) != 1)
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{
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fprintf(stderr, "%s: could not parse limit \"%s\"\n",
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progname, optarg);
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goto bad_argument;
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}
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break;
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case 'p':
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private.inpath = pg_strdup(optarg);
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break;
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case 'r':
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{
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int i;
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if (pg_strcasecmp(optarg, "list") == 0)
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{
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print_rmgr_list();
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exit(EXIT_SUCCESS);
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}
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for (i = 0; i < RM_MAX_ID; i++)
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{
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if (pg_strcasecmp(optarg, RmgrDescTable[i].rm_name) == 0)
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{
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config.filter_by_rmgr = i;
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break;
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}
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}
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if (config.filter_by_rmgr == -1)
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{
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fprintf(stderr, "%s: resource manager \"%s\" does not exist\n",
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progname, optarg);
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goto bad_argument;
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}
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}
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break;
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case 's':
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if (sscanf(optarg, "%X/%X", &xlogid, &xrecoff) != 2)
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{
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fprintf(stderr, "%s: could not parse start log position \"%s\"\n",
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progname, optarg);
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goto bad_argument;
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}
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else
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private.startptr = (uint64) xlogid << 32 | xrecoff;
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break;
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case 't':
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if (sscanf(optarg, "%d", &private.timeline) != 1)
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{
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fprintf(stderr, "%s: could not parse timeline \"%s\"\n",
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progname, optarg);
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goto bad_argument;
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}
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break;
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case 'V':
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puts("pg_xlogdump (PostgreSQL) " PG_VERSION);
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exit(EXIT_SUCCESS);
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break;
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case 'x':
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if (sscanf(optarg, "%u", &config.filter_by_xid) != 1)
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{
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fprintf(stderr, "%s: could not parse \"%s\" as a valid xid\n",
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progname, optarg);
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goto bad_argument;
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}
|
|
config.filter_by_xid_enabled = true;
|
|
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));
|
|
|
|
while ((record = XLogReadRecord(xlogreader_state, first_record, &errormsg)))
|
|
{
|
|
/* continue after the last record */
|
|
first_record = InvalidXLogRecPtr;
|
|
XLogDumpDisplayRecord(&config, xlogreader_state->ReadRecPtr, record);
|
|
|
|
/* check whether we printed enough */
|
|
if (config.stop_after_records > 0 &&
|
|
config.already_displayed_records >= config.stop_after_records)
|
|
break;
|
|
}
|
|
|
|
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;
|
|
}
|