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Prepare pg_dump internals for additional compression methods
Commit bf9aa490db introduced a compression API in compress_io.{c,h} to
make reuse easier, and allow adding more compression algorithms.
However, pg_backup_archiver.c was not switched to this API and continued
to call the compression directly.
This commit teaches pg_backup_archiver.c about the compression API, so
that it can benefit from bf9aa490db (simpler code, easier addition of
new compression methods).
Author: Georgios Kokolatos
Reviewed-by: Michael Paquier, Rachel Heaton, Justin Pryzby, Tomas Vondra
Discussion: https://postgr.es/m/faUNEOpts9vunEaLnmxmG-DldLSg_ql137OC3JYDmgrOMHm1RvvWY2IdBkv_CRxm5spCCb_OmKNk2T03TMm0fBEWveFF9wA1WizPuAgB7Ss%3D%40protonmail.com
This commit is contained in:
Tomas Vondra
parent
009eeee746
commit
03d02f54a6
@ -56,6 +56,41 @@
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#include "compress_io.h"
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#include "pg_backup_utils.h"
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#ifdef HAVE_LIBZ
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#include <zlib.h>
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#endif
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/*----------------------
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* Generic functions
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*----------------------
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*/
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/*
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* Checks whether a compression algorithm is supported.
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*
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* On success returns NULL, otherwise returns a malloc'ed string which can be
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* used by the caller in an error message.
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*/
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char *
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supports_compression(const pg_compress_specification compression_spec)
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{
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const pg_compress_algorithm algorithm = compression_spec.algorithm;
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bool supported = false;
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if (algorithm == PG_COMPRESSION_NONE)
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supported = true;
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#ifdef HAVE_LIBZ
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if (algorithm == PG_COMPRESSION_GZIP)
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supported = true;
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#endif
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if (!supported)
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return psprintf("this build does not support compression with %s",
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get_compress_algorithm_name(algorithm));
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return NULL;
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}
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/*----------------------
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* Compressor API
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*----------------------
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@ -490,16 +525,19 @@ cfopen_write(const char *path, const char *mode,
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}
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/*
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* Opens file 'path' in 'mode'. If compression is GZIP, the file
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* is opened with libz gzopen(), otherwise with plain fopen().
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* This is the workhorse for cfopen() or cfdopen(). It opens file 'path' or
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* associates a stream 'fd', if 'fd' is a valid descriptor, in 'mode'. The
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* descriptor is not dup'ed and it is the caller's responsibility to do so.
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* The caller must verify that the 'compress_algorithm' is supported by the
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* current build.
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*
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* On failure, return NULL with an error code in errno.
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*/
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cfp *
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cfopen(const char *path, const char *mode,
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const pg_compress_specification compression_spec)
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static cfp *
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cfopen_internal(const char *path, int fd, const char *mode,
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pg_compress_specification compression_spec)
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{
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cfp *fp = pg_malloc(sizeof(cfp));
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cfp *fp = pg_malloc0(sizeof(cfp));
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if (compression_spec.algorithm == PG_COMPRESSION_GZIP)
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{
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@ -511,15 +549,20 @@ cfopen(const char *path, const char *mode,
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snprintf(mode_compression, sizeof(mode_compression), "%s%d",
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mode, compression_spec.level);
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fp->compressedfp = gzopen(path, mode_compression);
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if (fd >= 0)
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fp->compressedfp = gzdopen(fd, mode_compression);
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else
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fp->compressedfp = gzopen(path, mode_compression);
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}
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else
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{
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/* don't specify a level, just use the zlib default */
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fp->compressedfp = gzopen(path, mode);
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if (fd >= 0)
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fp->compressedfp = gzdopen(fd, mode);
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else
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fp->compressedfp = gzopen(path, mode);
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}
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fp->uncompressedfp = NULL;
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if (fp->compressedfp == NULL)
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{
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free_keep_errno(fp);
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@ -531,10 +574,11 @@ cfopen(const char *path, const char *mode,
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}
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else
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{
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#ifdef HAVE_LIBZ
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fp->compressedfp = NULL;
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#endif
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fp->uncompressedfp = fopen(path, mode);
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if (fd >= 0)
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fp->uncompressedfp = fdopen(fd, mode);
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else
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fp->uncompressedfp = fopen(path, mode);
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if (fp->uncompressedfp == NULL)
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{
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free_keep_errno(fp);
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@ -545,6 +589,33 @@ cfopen(const char *path, const char *mode,
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return fp;
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}
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/*
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* Opens file 'path' in 'mode' and compression as defined in
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* compression_spec. The caller must verify that the compression
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* is supported by the current build.
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*
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* On failure, return NULL with an error code in errno.
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*/
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cfp *
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cfopen(const char *path, const char *mode,
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const pg_compress_specification compression_spec)
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{
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return cfopen_internal(path, -1, mode, compression_spec);
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}
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/*
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* Associates a stream 'fd', if 'fd' is a valid descriptor, in 'mode'
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* and compression as defined in compression_spec. The caller must
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* verify that the compression is supported by the current build.
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*
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* On failure, return NULL with an error code in errno.
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*/
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cfp *
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cfdopen(int fd, const char *mode,
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const pg_compress_specification compression_spec)
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{
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return cfopen_internal(NULL, fd, mode, compression_spec);
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}
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int
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cfread(void *ptr, int size, cfp *fp)
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@ -21,6 +21,8 @@
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#define ZLIB_OUT_SIZE 4096
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#define ZLIB_IN_SIZE 4096
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extern char *supports_compression(const pg_compress_specification compression_spec);
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/* Prototype for callback function to WriteDataToArchive() */
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typedef void (*WriteFunc) (ArchiveHandle *AH, const char *buf, size_t len);
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@ -54,6 +56,8 @@ typedef struct cfp cfp;
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extern cfp *cfopen(const char *path, const char *mode,
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const pg_compress_specification compression_spec);
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extern cfp *cfdopen(int fd, const char *mode,
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const pg_compress_specification compression_spec);
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extern cfp *cfopen_read(const char *path, const char *mode);
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extern cfp *cfopen_write(const char *path, const char *mode,
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const pg_compress_specification compression_spec);
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@ -31,6 +31,7 @@
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#endif
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#include "common/string.h"
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#include "compress_io.h"
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#include "dumputils.h"
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#include "fe_utils/string_utils.h"
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#include "lib/stringinfo.h"
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@ -43,13 +44,6 @@
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#define TEXT_DUMP_HEADER "--\n-- PostgreSQL database dump\n--\n\n"
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#define TEXT_DUMPALL_HEADER "--\n-- PostgreSQL database cluster dump\n--\n\n"
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/* state needed to save/restore an archive's output target */
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typedef struct _outputContext
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{
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void *OF;
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int gzOut;
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} OutputContext;
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/*
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* State for tracking TocEntrys that are ready to process during a parallel
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* restore. (This used to be a list, and we still call it that, though now
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@ -101,8 +95,8 @@ static void dump_lo_buf(ArchiveHandle *AH);
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static void dumpTimestamp(ArchiveHandle *AH, const char *msg, time_t tim);
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static void SetOutput(ArchiveHandle *AH, const char *filename,
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const pg_compress_specification compression_spec);
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static OutputContext SaveOutput(ArchiveHandle *AH);
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static void RestoreOutput(ArchiveHandle *AH, OutputContext savedContext);
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static cfp *SaveOutput(ArchiveHandle *AH);
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static void RestoreOutput(ArchiveHandle *AH, cfp *savedOutput);
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static int restore_toc_entry(ArchiveHandle *AH, TocEntry *te, bool is_parallel);
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static void restore_toc_entries_prefork(ArchiveHandle *AH,
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@ -277,11 +271,8 @@ CloseArchive(Archive *AHX)
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AH->ClosePtr(AH);
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/* Close the output */
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errno = 0; /* in case gzclose() doesn't set it */
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if (AH->gzOut)
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res = GZCLOSE(AH->OF);
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else if (AH->OF != stdout)
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res = fclose(AH->OF);
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errno = 0;
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res = cfclose(AH->OF);
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if (res != 0)
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pg_fatal("could not close output file: %m");
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@ -363,7 +354,7 @@ RestoreArchive(Archive *AHX)
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RestoreOptions *ropt = AH->public.ropt;
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bool parallel_mode;
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TocEntry *te;
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OutputContext sav;
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cfp *sav;
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AH->stage = STAGE_INITIALIZING;
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@ -391,17 +382,21 @@ RestoreArchive(Archive *AHX)
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/*
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* Make sure we won't need (de)compression we haven't got
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*/
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#ifndef HAVE_LIBZ
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if (AH->compression_spec.algorithm == PG_COMPRESSION_GZIP &&
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AH->PrintTocDataPtr != NULL)
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if (AH->PrintTocDataPtr != NULL)
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{
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for (te = AH->toc->next; te != AH->toc; te = te->next)
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{
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if (te->hadDumper && (te->reqs & REQ_DATA) != 0)
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pg_fatal("cannot restore from compressed archive (compression not supported in this installation)");
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{
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char *errmsg = supports_compression(AH->compression_spec);
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if (errmsg)
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pg_fatal("cannot restore from compressed archive (%s)",
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errmsg);
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else
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break;
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}
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}
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}
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#endif
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/*
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* Prepare index arrays, so we can assume we have them throughout restore.
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@ -1133,7 +1128,7 @@ PrintTOCSummary(Archive *AHX)
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TocEntry *te;
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pg_compress_specification out_compression_spec = {0};
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teSection curSection;
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OutputContext sav;
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cfp *sav;
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const char *fmtName;
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char stamp_str[64];
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@ -1508,58 +1503,32 @@ static void
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SetOutput(ArchiveHandle *AH, const char *filename,
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const pg_compress_specification compression_spec)
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{
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int fn;
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const char *mode;
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int fn = -1;
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if (filename)
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{
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if (strcmp(filename, "-") == 0)
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fn = fileno(stdout);
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else
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fn = -1;
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}
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else if (AH->FH)
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fn = fileno(AH->FH);
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else if (AH->fSpec)
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{
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fn = -1;
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filename = AH->fSpec;
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}
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else
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fn = fileno(stdout);
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/* If compression explicitly requested, use gzopen */
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#ifdef HAVE_LIBZ
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if (compression_spec.algorithm == PG_COMPRESSION_GZIP)
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{
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char fmode[14];
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/* Don't use PG_BINARY_x since this is zlib */
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sprintf(fmode, "wb%d", compression_spec.level);
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if (fn >= 0)
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AH->OF = gzdopen(dup(fn), fmode);
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else
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AH->OF = gzopen(filename, fmode);
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AH->gzOut = 1;
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}
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if (AH->mode == archModeAppend)
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mode = PG_BINARY_A;
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else
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#endif
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{ /* Use fopen */
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if (AH->mode == archModeAppend)
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{
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if (fn >= 0)
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AH->OF = fdopen(dup(fn), PG_BINARY_A);
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else
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AH->OF = fopen(filename, PG_BINARY_A);
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}
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else
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{
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if (fn >= 0)
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AH->OF = fdopen(dup(fn), PG_BINARY_W);
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else
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AH->OF = fopen(filename, PG_BINARY_W);
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}
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AH->gzOut = 0;
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}
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mode = PG_BINARY_W;
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if (fn >= 0)
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AH->OF = cfdopen(dup(fn), mode, compression_spec);
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else
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AH->OF = cfopen(filename, mode, compression_spec);
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if (!AH->OF)
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{
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@ -1570,33 +1539,24 @@ SetOutput(ArchiveHandle *AH, const char *filename,
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}
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}
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static OutputContext
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static cfp *
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SaveOutput(ArchiveHandle *AH)
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{
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OutputContext sav;
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sav.OF = AH->OF;
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sav.gzOut = AH->gzOut;
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return sav;
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return (cfp *) AH->OF;
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}
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static void
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RestoreOutput(ArchiveHandle *AH, OutputContext savedContext)
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RestoreOutput(ArchiveHandle *AH, cfp *savedOutput)
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{
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int res;
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errno = 0; /* in case gzclose() doesn't set it */
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if (AH->gzOut)
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res = GZCLOSE(AH->OF);
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else
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res = fclose(AH->OF);
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errno = 0;
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res = cfclose(AH->OF);
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if (res != 0)
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pg_fatal("could not close output file: %m");
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AH->gzOut = savedContext.gzOut;
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AH->OF = savedContext.OF;
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AH->OF = savedOutput;
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}
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@ -1720,22 +1680,17 @@ ahwrite(const void *ptr, size_t size, size_t nmemb, ArchiveHandle *AH)
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bytes_written = size * nmemb;
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}
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else if (AH->gzOut)
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bytes_written = GZWRITE(ptr, size, nmemb, AH->OF);
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else if (AH->CustomOutPtr)
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bytes_written = AH->CustomOutPtr(AH, ptr, size * nmemb);
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/*
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* If we're doing a restore, and it's direct to DB, and we're connected
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* then send it to the DB.
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*/
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else if (RestoringToDB(AH))
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bytes_written = ExecuteSqlCommandBuf(&AH->public, (const char *) ptr, size * nmemb);
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else
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{
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/*
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* If we're doing a restore, and it's direct to DB, and we're
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* connected then send it to the DB.
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*/
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if (RestoringToDB(AH))
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bytes_written = ExecuteSqlCommandBuf(&AH->public, (const char *) ptr, size * nmemb);
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else
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bytes_written = fwrite(ptr, size, nmemb, AH->OF) * size;
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}
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bytes_written = cfwrite(ptr, size * nmemb, AH->OF);
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if (bytes_written != size * nmemb)
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WRITE_ERROR_EXIT;
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@ -2224,6 +2179,7 @@ _allocAH(const char *FileSpec, const ArchiveFormat fmt,
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SetupWorkerPtrType setupWorkerPtr)
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{
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ArchiveHandle *AH;
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pg_compress_specification out_compress_spec = {0};
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pg_log_debug("allocating AH for %s, format %d",
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FileSpec ? FileSpec : "(stdio)", fmt);
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@ -2277,8 +2233,8 @@ _allocAH(const char *FileSpec, const ArchiveFormat fmt,
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memset(&(AH->sqlparse), 0, sizeof(AH->sqlparse));
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/* Open stdout with no compression for AH output handle */
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AH->gzOut = 0;
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AH->OF = stdout;
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out_compress_spec.algorithm = PG_COMPRESSION_NONE;
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AH->OF = cfdopen(dup(fileno(stdout)), PG_BINARY_A, out_compress_spec);
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/*
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* On Windows, we need to use binary mode to read/write non-text files,
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@ -3712,6 +3668,7 @@ WriteHead(ArchiveHandle *AH)
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void
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ReadHead(ArchiveHandle *AH)
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{
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char *errmsg;
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char vmaj,
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vmin,
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vrev;
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@ -3781,10 +3738,13 @@ ReadHead(ArchiveHandle *AH)
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else
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AH->compression_spec.algorithm = PG_COMPRESSION_GZIP;
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#ifndef HAVE_LIBZ
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if (AH->compression_spec.algorithm == PG_COMPRESSION_GZIP)
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pg_log_warning("archive is compressed, but this installation does not support compression -- no data will be available");
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#endif
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errmsg = supports_compression(AH->compression_spec);
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if (errmsg)
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{
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pg_log_warning("archive is compressed, but this installation does not support compression (%s) -- no data will be available",
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errmsg);
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pg_free(errmsg);
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}
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if (AH->version >= K_VERS_1_4)
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{
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@ -32,30 +32,6 @@
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#define LOBBUFSIZE 16384
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#ifdef HAVE_LIBZ
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#include <zlib.h>
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#define GZCLOSE(fh) gzclose(fh)
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#define GZWRITE(p, s, n, fh) gzwrite(fh, p, (n) * (s))
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#define GZREAD(p, s, n, fh) gzread(fh, p, (n) * (s))
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#define GZEOF(fh) gzeof(fh)
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#else
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#define GZCLOSE(fh) fclose(fh)
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#define GZWRITE(p, s, n, fh) (fwrite(p, s, n, fh) * (s))
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#define GZREAD(p, s, n, fh) fread(p, s, n, fh)
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#define GZEOF(fh) feof(fh)
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/* this is just the redefinition of a libz constant */
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#define Z_DEFAULT_COMPRESSION (-1)
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typedef struct _z_stream
|
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{
|
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void *next_in;
|
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void *next_out;
|
||||
size_t avail_in;
|
||||
size_t avail_out;
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} z_stream;
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typedef z_stream *z_streamp;
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#endif
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/* Data block types */
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||||
#define BLK_DATA 1
|
||||
#define BLK_BLOBS 3
|
||||
@ -319,8 +295,7 @@ struct _archiveHandle
|
||||
|
||||
char *fSpec; /* Archive File Spec */
|
||||
FILE *FH; /* General purpose file handle */
|
||||
void *OF;
|
||||
int gzOut; /* Output file */
|
||||
void *OF; /* Output file */
|
||||
|
||||
struct _tocEntry *toc; /* Header of circular list of TOC entries */
|
||||
int tocCount; /* Number of TOC entries */
|
||||
|
||||
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Reference in New Issue
Block a user