pg_backup.h

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/*-------------------------------------------------------------------------
 *
 * pg_backup.h
 *
 *  Public interface to the pg_dump archiver routines.
 *
 *  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.h
 *
 *-------------------------------------------------------------------------
 */

#ifndef PG_BACKUP_H
#define PG_BACKUP_H

#include "fe_utils/simple_list.h"
#include "libpq-fe.h"


typedef enum trivalue
{
    TRI_DEFAULT,
    TRI_NO,
    TRI_YES
} trivalue;

typedef enum _archiveFormat
{
    archUnknown = 0,
    archCustom = 1,
    archTar = 3,
    archNull = 4,
    archDirectory = 5
} ArchiveFormat;

typedef enum _archiveMode
{
    archModeAppend,
    archModeWrite,
    archModeRead
} ArchiveMode;

typedef enum _teSection
{
    SECTION_NONE = 1,           /* COMMENTs, ACLs, etc; can be anywhere */
    SECTION_PRE_DATA,           /* stuff to be processed before data */
    SECTION_DATA,               /* TABLE DATA, BLOBS, BLOB COMMENTS */
    SECTION_POST_DATA           /* stuff to be processed after data */
} teSection;

/* Parameters needed by ConnectDatabase; same for dump and restore */
typedef struct _connParams
{
    /* These fields record the actual command line parameters */
    char       *dbname;         /* this may be a connstring! */
    char       *pgport;
    char       *pghost;
    char       *username;
    trivalue    promptPassword;
    /* If not NULL, this overrides the dbname obtained from command line */
    /* (but *only* the DB name, not anything else in the connstring) */
    char       *override_dbname;
} ConnParams;

typedef struct _restoreOptions
{
    int         createDB;       /* Issue commands to create the database */
    int         noOwner;        /* Don't try to match original object owner */
    int         noTablespace;   /* Don't issue tablespace-related commands */
    int         disable_triggers;   /* disable triggers during data-only
                                     * restore */
    int         use_setsessauth;    /* Use SET SESSION AUTHORIZATION commands
                                     * instead of OWNER TO */
    char       *superuser;      /* Username to use as superuser */
    char       *use_role;       /* Issue SET ROLE to this */
    int         dropSchema;
    int         disable_dollar_quoting;
    int         dump_inserts;   /* 0 = COPY, otherwise rows per INSERT */
    int         column_inserts;
    int         if_exists;
    int         no_comments;    /* Skip comments */
    int         no_publications;    /* Skip publication entries */
    int         no_security_labels; /* Skip security label entries */
    int         no_subscriptions;   /* Skip subscription entries */
    int         strict_names;

    const char *filename;
    int         dataOnly;
    int         schemaOnly;
    int         dumpSections;
    int         verbose;
    int         aclsSkip;
    const char *lockWaitTimeout;
    int         include_everything;

    int         tocSummary;
    char       *tocFile;
    int         format;
    char       *formatName;

    int         selTypes;
    int         selIndex;
    int         selFunction;
    int         selTrigger;
    int         selTable;
    SimpleStringList indexNames;
    SimpleStringList functionNames;
    SimpleStringList schemaNames;
    SimpleStringList schemaExcludeNames;
    SimpleStringList triggerNames;
    SimpleStringList tableNames;

    int         useDB;
    ConnParams  cparams;        /* parameters to use if useDB */

    int         noDataForFailedTables;
    int         exit_on_error;
    int         compression;
    int         suppressDumpWarnings;   /* Suppress output of WARNING entries
                                         * to stderr */
    bool        single_txn;

    bool       *idWanted;       /* array showing which dump IDs to emit */
    int         enable_row_security;
    int         sequence_data;  /* dump sequence data even in schema-only mode */
    int         binary_upgrade;
} RestoreOptions;

typedef struct _dumpOptions
{
    ConnParams  cparams;

    int         binary_upgrade;

    /* various user-settable parameters */
    bool        schemaOnly;
    bool        dataOnly;
    int         dumpSections;   /* bitmask of chosen sections */
    bool        aclsSkip;
    const char *lockWaitTimeout;
    int         dump_inserts;   /* 0 = COPY, otherwise rows per INSERT */

    /* flags for various command-line long options */
    int         disable_dollar_quoting;
    int         column_inserts;
    int         if_exists;
    int         no_comments;
    int         no_security_labels;
    int         no_publications;
    int         no_subscriptions;
    int         no_synchronized_snapshots;
    int         no_unlogged_table_data;
    int         serializable_deferrable;
    int         disable_triggers;
    int         outputNoTablespaces;
    int         use_setsessauth;
    int         enable_row_security;
    int         load_via_partition_root;

    /* default, if no "inclusion" switches appear, is to dump everything */
    bool        include_everything;

    int         outputClean;
    int         outputCreateDB;
    bool        outputBlobs;
    bool        dontOutputBlobs;
    int         outputNoOwner;
    char       *outputSuperuser;

    int         sequence_data;  /* dump sequence data even in schema-only mode */
    int         do_nothing;
    int         coll_unknown;
} DumpOptions;

/*
 *  We may want to have some more user-readable data, but in the mean
 *  time this gives us some abstraction and type checking.
 */
typedef struct Archive
{
    DumpOptions *dopt;          /* options, if dumping */
    RestoreOptions *ropt;       /* options, if restoring */

    int         verbose;
    char       *remoteVersionStr;   /* server's version string */
    int         remoteVersion;  /* same in numeric form */
    bool        isStandby;      /* is server a standby node */

    int         minRemoteVersion;   /* allowable range */
    int         maxRemoteVersion;

    int         numWorkers;     /* number of parallel processes */
    char       *sync_snapshot_id;   /* sync snapshot id for parallel operation */

    /* info needed for string escaping */
    int         encoding;       /* libpq code for client_encoding */
    bool        std_strings;    /* standard_conforming_strings */

    /* other important stuff */
    char       *searchpath;     /* search_path to set during restore */
    char       *use_role;       /* Issue SET ROLE to this */

    /* error handling */
    bool        exit_on_error;  /* whether to exit on SQL errors... */
    int         n_errors;       /* number of errors (if no die) */

    /* The rest is private */
} Archive;


/*
 * pg_dump uses two different mechanisms for identifying database objects:
 *
 * CatalogId represents an object by the tableoid and oid of its defining
 * entry in the system catalogs.  We need this to interpret pg_depend entries,
 * for instance.
 *
 * DumpId is a simple sequential integer counter assigned as dumpable objects
 * are identified during a pg_dump run.  We use DumpId internally in preference
 * to CatalogId for two reasons: it's more compact, and we can assign DumpIds
 * to "objects" that don't have a separate CatalogId.  For example, it is
 * convenient to consider a table, its data, and its ACL as three separate
 * dumpable "objects" with distinct DumpIds --- this lets us reason about the
 * order in which to dump these things.
 */

typedef struct
{
    Oid         tableoid;
    Oid         oid;
} CatalogId;

typedef int DumpId;

#define InvalidDumpId 0

/*
 * Function pointer prototypes for assorted callback methods.
 */

typedef int (*DataDumperPtr) (Archive *AH, void *userArg);

typedef void (*SetupWorkerPtrType) (Archive *AH);

/*
 * Main archiver interface.
 */

extern void ConnectDatabase(Archive *AHX,
                            const ConnParams *cparams,
                            bool isReconnect);
extern void DisconnectDatabase(Archive *AHX);
extern PGconn *GetConnection(Archive *AHX);

/* Called to write *data* to the archive */
extern void WriteData(Archive *AH, const void *data, size_t dLen);

extern int  StartBlob(Archive *AH, Oid oid);
extern int  EndBlob(Archive *AH, Oid oid);

extern void CloseArchive(Archive *AH);

extern void SetArchiveOptions(Archive *AH, DumpOptions *dopt, RestoreOptions *ropt);

extern void ProcessArchiveRestoreOptions(Archive *AH);

extern void RestoreArchive(Archive *AH);

/* Open an existing archive */
extern Archive *OpenArchive(const char *FileSpec, const ArchiveFormat fmt);

/* Create a new archive */
extern Archive *CreateArchive(const char *FileSpec, const ArchiveFormat fmt,
                              const int compression, bool dosync, ArchiveMode mode,
                              SetupWorkerPtrType setupDumpWorker);

/* The --list option */
extern void PrintTOCSummary(Archive *AH);

extern RestoreOptions *NewRestoreOptions(void);

extern DumpOptions *NewDumpOptions(void);
extern void InitDumpOptions(DumpOptions *opts);
extern DumpOptions *dumpOptionsFromRestoreOptions(RestoreOptions *ropt);

/* Rearrange and filter TOC entries */
extern void SortTocFromFile(Archive *AHX);

/* Convenience functions used only when writing DATA */
extern void archputs(const char *s, Archive *AH);
extern int  archprintf(Archive *AH, const char *fmt,...) pg_attribute_printf(2, 3);

#define appendStringLiteralAH(buf,str,AH) \
    appendStringLiteral(buf, str, (AH)->encoding, (AH)->std_strings)

#endif                          /* PG_BACKUP_H */