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postgresql/src/bin/pg_dump/pg_backup_archiver.h

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/*-------------------------------------------------------------------------
*
* pg_backup_archiver.h
*
* Private interface to the pg_dump archiver routines.
* It is NOT intended that these routines be called by any
* dumper directly.
*
* See the headers to pg_restore for more details.
*
* Copyright (c) 2000, Philip Warner
* Rights are granted to use this software in any way so long
* as this notice is not removed.
*
* The author is not responsible for loss or damages that may
* result from its use.
*
*
* IDENTIFICATION
* src/bin/pg_dump/pg_backup_archiver.h
*
*-------------------------------------------------------------------------
*/
#ifndef __PG_BACKUP_ARCHIVE__
#define __PG_BACKUP_ARCHIVE__
#include <time.h>
#include "libpq-fe.h"
#include "pg_backup.h"
#include "pqexpbuffer.h"
#define LOBBUFSIZE 16384
/* Data block types */
#define BLK_DATA 1
#define BLK_BLOBS 3
/* Encode version components into a convenient integer <maj><min><rev> */
#define MAKE_ARCHIVE_VERSION(major, minor, rev) (((major) * 256 + (minor)) * 256 + (rev))
#define ARCHIVE_MAJOR(version) (((version) >> 16) & 255)
#define ARCHIVE_MINOR(version) (((version) >> 8) & 255)
#define ARCHIVE_REV(version) (((version) ) & 255)
/* Historical version numbers (checked in code) */
#define K_VERS_1_0 MAKE_ARCHIVE_VERSION(1, 0, 0)
#define K_VERS_1_2 MAKE_ARCHIVE_VERSION(1, 2, 0) /* Allow No ZLIB */
#define K_VERS_1_3 MAKE_ARCHIVE_VERSION(1, 3, 0) /* BLOBS */
#define K_VERS_1_4 MAKE_ARCHIVE_VERSION(1, 4, 0) /* Date & name in header */
#define K_VERS_1_5 MAKE_ARCHIVE_VERSION(1, 5, 0) /* Handle dependencies */
#define K_VERS_1_6 MAKE_ARCHIVE_VERSION(1, 6, 0) /* Schema field in TOCs */
#define K_VERS_1_7 MAKE_ARCHIVE_VERSION(1, 7, 0) /* File Offset size in
* header */
#define K_VERS_1_8 MAKE_ARCHIVE_VERSION(1, 8, 0) /* change interpretation
* of ID numbers and
* dependencies */
#define K_VERS_1_9 MAKE_ARCHIVE_VERSION(1, 9, 0) /* add default_with_oids
* tracking */
#define K_VERS_1_10 MAKE_ARCHIVE_VERSION(1, 10, 0) /* add tablespace */
#define K_VERS_1_11 MAKE_ARCHIVE_VERSION(1, 11, 0) /* add toc section
* indicator */
#define K_VERS_1_12 MAKE_ARCHIVE_VERSION(1, 12, 0) /* add separate BLOB
* entries */
#define K_VERS_1_13 MAKE_ARCHIVE_VERSION(1, 13, 0) /* change search_path
* behavior */
#define K_VERS_1_14 MAKE_ARCHIVE_VERSION(1, 14, 0) /* add tableam */
#define K_VERS_1_15 MAKE_ARCHIVE_VERSION(1, 15, 0) /* add
* compression_algorithm
* in header */
#define K_VERS_1_16 MAKE_ARCHIVE_VERSION(1, 16, 0) /* BLOB METADATA entries
* and multiple BLOBS */
/* Current archive version number (the format we can output) */
#define K_VERS_MAJOR 1
#define K_VERS_MINOR 16
#define K_VERS_REV 0
#define K_VERS_SELF MAKE_ARCHIVE_VERSION(K_VERS_MAJOR, K_VERS_MINOR, K_VERS_REV)
/* Newest format we can read */
#define K_VERS_MAX MAKE_ARCHIVE_VERSION(K_VERS_MAJOR, K_VERS_MINOR, 255)
/* Flags to indicate disposition of offsets stored in files */
#define K_OFFSET_POS_NOT_SET 1
#define K_OFFSET_POS_SET 2
#define K_OFFSET_NO_DATA 3
/*
* Special exit values from worker children. We reserve 0 for normal
* success; 1 and other small values should be interpreted as crashes.
*/
#define WORKER_OK 0
#define WORKER_CREATE_DONE 10
#define WORKER_INHIBIT_DATA 11
#define WORKER_IGNORED_ERRORS 12
typedef struct _archiveHandle ArchiveHandle;
typedef struct _tocEntry TocEntry;
struct ParallelState;
#define READ_ERROR_EXIT(fd) \
do { \
if (feof(fd)) \
pg_fatal("could not read from input file: end of file"); \
else \
pg_fatal("could not read from input file: %m"); \
} while (0)
#define WRITE_ERROR_EXIT \
do { \
pg_fatal("could not write to output file: %m"); \
} while (0)
typedef enum T_Action
{
ACT_DUMP,
ACT_RESTORE,
} T_Action;
typedef void (*ClosePtrType) (ArchiveHandle *AH);
typedef void (*ReopenPtrType) (ArchiveHandle *AH);
typedef void (*ArchiveEntryPtrType) (ArchiveHandle *AH, TocEntry *te);
typedef void (*StartDataPtrType) (ArchiveHandle *AH, TocEntry *te);
typedef void (*WriteDataPtrType) (ArchiveHandle *AH, const void *data, size_t dLen);
typedef void (*EndDataPtrType) (ArchiveHandle *AH, TocEntry *te);
typedef void (*StartLOsPtrType) (ArchiveHandle *AH, TocEntry *te);
typedef void (*StartLOPtrType) (ArchiveHandle *AH, TocEntry *te, Oid oid);
typedef void (*EndLOPtrType) (ArchiveHandle *AH, TocEntry *te, Oid oid);
typedef void (*EndLOsPtrType) (ArchiveHandle *AH, TocEntry *te);
typedef int (*WriteBytePtrType) (ArchiveHandle *AH, const int i);
typedef int (*ReadBytePtrType) (ArchiveHandle *AH);
typedef void (*WriteBufPtrType) (ArchiveHandle *AH, const void *c, size_t len);
typedef void (*ReadBufPtrType) (ArchiveHandle *AH, void *buf, size_t len);
typedef void (*WriteExtraTocPtrType) (ArchiveHandle *AH, TocEntry *te);
typedef void (*ReadExtraTocPtrType) (ArchiveHandle *AH, TocEntry *te);
typedef void (*PrintExtraTocPtrType) (ArchiveHandle *AH, TocEntry *te);
typedef void (*PrintTocDataPtrType) (ArchiveHandle *AH, TocEntry *te);
typedef void (*PrepParallelRestorePtrType) (ArchiveHandle *AH);
typedef void (*ClonePtrType) (ArchiveHandle *AH);
typedef void (*DeClonePtrType) (ArchiveHandle *AH);
typedef int (*WorkerJobDumpPtrType) (ArchiveHandle *AH, TocEntry *te);
typedef int (*WorkerJobRestorePtrType) (ArchiveHandle *AH, TocEntry *te);
typedef size_t (*CustomOutPtrType) (ArchiveHandle *AH, const void *buf, size_t len);
typedef enum
{
SQL_SCAN = 0, /* normal */
SQL_IN_SINGLE_QUOTE, /* '...' literal */
SQL_IN_DOUBLE_QUOTE, /* "..." identifier */
} sqlparseState;
typedef struct
{
sqlparseState state; /* see above */
bool backSlash; /* next char is backslash quoted? */
PQExpBuffer curCmd; /* incomplete line (NULL if not created) */
} sqlparseInfo;
typedef enum
{
STAGE_NONE = 0,
STAGE_INITIALIZING,
STAGE_PROCESSING,
STAGE_FINALIZING,
} ArchiverStage;
typedef enum
{
OUTPUT_SQLCMDS = 0, /* emitting general SQL commands */
OUTPUT_COPYDATA, /* writing COPY data */
OUTPUT_OTHERDATA, /* writing data as INSERT commands */
} ArchiverOutput;
/*
* For historical reasons, ACL items are interspersed with everything else in
* a dump file's TOC; typically they're right after the object they're for.
* However, we need to restore data before ACLs, as otherwise a read-only
* table (ie one where the owner has revoked her own INSERT privilege) causes
* data restore failures. On the other hand, matview REFRESH commands should
* come out after ACLs, as otherwise non-superuser-owned matviews might not
* be able to execute. (If the permissions at the time of dumping would not
* allow a REFRESH, too bad; we won't fix that for you.) We also want event
* triggers to be restored after ACLs, so that they can't mess those up.
*
* These considerations force us to make three passes over the TOC,
* restoring the appropriate subset of items in each pass. We assume that
* the dependency sort resulted in an appropriate ordering of items within
* each subset.
*
* XXX This mechanism should be superseded by tracking dependencies on ACLs
* properly; but we'll still need it for old dump files even after that.
*/
typedef enum
{
RESTORE_PASS_MAIN = 0, /* Main pass (most TOC item types) */
RESTORE_PASS_ACL, /* ACL item types */
RESTORE_PASS_POST_ACL, /* Event trigger and matview refresh items */
#define RESTORE_PASS_LAST RESTORE_PASS_POST_ACL
} RestorePass;
#define REQ_SCHEMA 0x01 /* want schema */
#define REQ_DATA 0x02 /* want data */
#define REQ_SPECIAL 0x04 /* for special TOC entries */
struct _archiveHandle
{
Archive public; /* Public part of archive */
int version; /* Version of file */
char *archiveRemoteVersion; /* When reading an archive, the
* version of the dumped DB */
char *archiveDumpVersion; /* When reading an archive, the version of
* the dumper */
size_t intSize; /* Size of an integer in the archive */
size_t offSize; /* Size of a file offset in the archive -
* Added V1.7 */
ArchiveFormat format; /* Archive format */
sqlparseInfo sqlparse; /* state for parsing INSERT data */
time_t createDate; /* Date archive created */
/*
* Fields used when discovering archive format. For tar format, we load
* the first block into the lookahead buffer, and verify that it looks
* like a tar header. The tar module must then consume bytes from the
* lookahead buffer before reading any more from the file. For custom
* format, we load only the "PGDMP" marker into the buffer, and then set
* readHeader after confirming it matches. The buffer is vestigial in
* this case, as the subsequent code just checks readHeader and doesn't
* examine the buffer.
*/
int readHeader; /* Set if we already read "PGDMP" marker */
char *lookahead; /* Buffer used when reading header to discover
* format */
size_t lookaheadSize; /* Allocated size of buffer */
size_t lookaheadLen; /* Length of valid data in lookahead */
size_t lookaheadPos; /* Current read position in lookahead buffer */
ArchiveEntryPtrType ArchiveEntryPtr; /* Called for each metadata object */
StartDataPtrType StartDataPtr; /* Called when table data is about to be
* dumped */
WriteDataPtrType WriteDataPtr; /* Called to send some table data to the
* archive */
EndDataPtrType EndDataPtr; /* Called when table data dump is finished */
WriteBytePtrType WriteBytePtr; /* Write a byte to output */
ReadBytePtrType ReadBytePtr; /* Read a byte from an archive */
WriteBufPtrType WriteBufPtr; /* Write a buffer of output to the archive */
ReadBufPtrType ReadBufPtr; /* Read a buffer of input from the archive */
ClosePtrType ClosePtr; /* Close the archive */
ReopenPtrType ReopenPtr; /* Reopen the archive */
WriteExtraTocPtrType WriteExtraTocPtr; /* Write extra TOC entry data
* associated with the current
* archive format */
ReadExtraTocPtrType ReadExtraTocPtr; /* Read extra info associated with
* archive format */
PrintExtraTocPtrType PrintExtraTocPtr; /* Extra TOC info for format */
PrintTocDataPtrType PrintTocDataPtr;
StartLOsPtrType StartLOsPtr;
EndLOsPtrType EndLOsPtr;
StartLOPtrType StartLOPtr;
EndLOPtrType EndLOPtr;
SetupWorkerPtrType SetupWorkerPtr;
WorkerJobDumpPtrType WorkerJobDumpPtr;
WorkerJobRestorePtrType WorkerJobRestorePtr;
PrepParallelRestorePtrType PrepParallelRestorePtr;
ClonePtrType ClonePtr; /* Clone format-specific fields */
DeClonePtrType DeClonePtr; /* Clean up cloned fields */
CustomOutPtrType CustomOutPtr; /* Alternative script output routine */
/* Stuff for direct DB connection */
char *archdbname; /* DB name *read* from archive */
char *savedPassword; /* password for ropt->username, if known */
char *use_role;
PGconn *connection;
/* If connCancel isn't NULL, SIGINT handler will send a cancel */
PGcancel *volatile connCancel;
int connectToDB; /* Flag to indicate if direct DB connection is
* required */
ArchiverOutput outputKind; /* Flag for what we're currently writing */
bool pgCopyIn; /* Currently in libpq 'COPY IN' mode. */
int loFd;
bool writingLO;
int loCount; /* # of LOs restored */
char *fSpec; /* Archive File Spec */
FILE *FH; /* General purpose file handle */
void *OF; /* Output file */
struct _tocEntry *toc; /* Header of circular list of TOC entries */
int tocCount; /* Number of TOC entries */
DumpId maxDumpId; /* largest DumpId among all TOC entries */
/* arrays created after the TOC list is complete: */
struct _tocEntry **tocsByDumpId; /* TOCs indexed by dumpId */
DumpId *tableDataId; /* TABLE DATA ids, indexed by table dumpId */
struct _tocEntry *currToc; /* Used when dumping data */
pg_compress_specification compression_spec; /* Requested specification for
* compression */
bool dosync; /* data requested to be synced on sight */
DataDirSyncMethod sync_method;
ArchiveMode mode; /* File mode - r or w */
void *formatData; /* Header data specific to file format */
/* these vars track state to avoid sending redundant SET commands */
char *currUser; /* current username, or NULL if unknown */
char *currSchema; /* current schema, or NULL */
char *currTablespace; /* current tablespace, or NULL */
char *currTableAm; /* current table access method, or NULL */
void *lo_buf;
size_t lo_buf_used;
size_t lo_buf_size;
int noTocComments;
ArchiverStage stage;
ArchiverStage lastErrorStage;
RestorePass restorePass; /* used only during parallel restore */
struct _tocEntry *currentTE;
struct _tocEntry *lastErrorTE;
};
struct _tocEntry
{
struct _tocEntry *prev;
struct _tocEntry *next;
CatalogId catalogId;
DumpId dumpId;
teSection section;
bool hadDumper; /* Archiver was passed a dumper routine (used
* in restore) */
char *tag; /* index tag */
char *namespace; /* null or empty string if not in a schema */
char *tablespace; /* null if not in a tablespace; empty string
* means use database default */
char *tableam; /* table access method, only for TABLE tags */
char *owner;
char *desc;
char *defn;
char *dropStmt;
char *copyStmt;
DumpId *dependencies; /* dumpIds of objects this one depends on */
int nDeps; /* number of dependencies */
DataDumperPtr dataDumper; /* Routine to dump data for object */
const void *dataDumperArg; /* Arg for above routine */
void *formatData; /* TOC Entry data specific to file format */
/* working state while dumping/restoring */
pgoff_t dataLength; /* item's data size; 0 if none or unknown */
int reqs; /* do we need schema and/or data of object
* (REQ_* bit mask) */
bool created; /* set for DATA member if TABLE was created */
/* working state (needed only for parallel restore) */
struct _tocEntry *pending_prev; /* list links for pending-items list; */
struct _tocEntry *pending_next; /* NULL if not in that list */
int depCount; /* number of dependencies not yet restored */
DumpId *revDeps; /* dumpIds of objects depending on this one */
int nRevDeps; /* number of such dependencies */
DumpId *lockDeps; /* dumpIds of objects this one needs lock on */
int nLockDeps; /* number of such dependencies */
};
extern int parallel_restore(ArchiveHandle *AH, TocEntry *te);
extern void on_exit_close_archive(Archive *AHX);
extern void warn_or_exit_horribly(ArchiveHandle *AH, const char *fmt,...) pg_attribute_printf(2, 3);
/* Options for ArchiveEntry */
typedef struct _archiveOpts
{
const char *tag;
const char *namespace;
const char *tablespace;
const char *tableam;
const char *owner;
const char *description;
teSection section;
const char *createStmt;
const char *dropStmt;
const char *copyStmt;
const DumpId *deps;
int nDeps;
DataDumperPtr dumpFn;
const void *dumpArg;
} ArchiveOpts;
#define ARCHIVE_OPTS(...) &(ArchiveOpts){__VA_ARGS__}
/* Called to add a TOC entry */
extern TocEntry *ArchiveEntry(Archive *AHX, CatalogId catalogId,
DumpId dumpId, ArchiveOpts *opts);
extern void WriteHead(ArchiveHandle *AH);
extern void ReadHead(ArchiveHandle *AH);
extern void WriteToc(ArchiveHandle *AH);
extern void ReadToc(ArchiveHandle *AH);
extern void WriteDataChunks(ArchiveHandle *AH, struct ParallelState *pstate);
extern void WriteDataChunksForTocEntry(ArchiveHandle *AH, TocEntry *te);
extern ArchiveHandle *CloneArchive(ArchiveHandle *AH);
extern void DeCloneArchive(ArchiveHandle *AH);
extern int TocIDRequired(ArchiveHandle *AH, DumpId id);
TocEntry *getTocEntryByDumpId(ArchiveHandle *AH, DumpId id);
extern bool checkSeek(FILE *fp);
#define appendStringLiteralAHX(buf,str,AH) \
appendStringLiteral(buf, str, (AH)->public.encoding, (AH)->public.std_strings)
#define appendByteaLiteralAHX(buf,str,len,AH) \
appendByteaLiteral(buf, str, len, (AH)->public.std_strings)
/*
* Mandatory routines for each supported format
*/
extern size_t WriteInt(ArchiveHandle *AH, int i);
extern int ReadInt(ArchiveHandle *AH);
extern char *ReadStr(ArchiveHandle *AH);
extern size_t WriteStr(ArchiveHandle *AH, const char *c);
int ReadOffset(ArchiveHandle *, pgoff_t *);
size_t WriteOffset(ArchiveHandle *, pgoff_t, int);
extern void StartRestoreLOs(ArchiveHandle *AH);
extern void StartRestoreLO(ArchiveHandle *AH, Oid oid, bool drop);
extern void EndRestoreLO(ArchiveHandle *AH, Oid oid);
extern void EndRestoreLOs(ArchiveHandle *AH);
extern void InitArchiveFmt_Custom(ArchiveHandle *AH);
extern void InitArchiveFmt_Null(ArchiveHandle *AH);
extern void InitArchiveFmt_Directory(ArchiveHandle *AH);
extern void InitArchiveFmt_Tar(ArchiveHandle *AH);
extern bool isValidTarHeader(char *header);
extern void ReconnectToServer(ArchiveHandle *AH, const char *dbname);
extern void IssueCommandPerBlob(ArchiveHandle *AH, TocEntry *te,
const char *cmdBegin, const char *cmdEnd);
extern void IssueACLPerBlob(ArchiveHandle *AH, TocEntry *te);
extern void DropLOIfExists(ArchiveHandle *AH, Oid oid);
void ahwrite(const void *ptr, size_t size, size_t nmemb, ArchiveHandle *AH);
int ahprintf(ArchiveHandle *AH, const char *fmt,...) pg_attribute_printf(2, 3);
#endif
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