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wal2json.c
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wal2json.c
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/*-------------------------------------------------------------------------
*
* wal2json.c
* JSON output plugin for changeset extraction
*
* Copyright (c) 2013-2024, Euler Taveira de Oliveira
*
* IDENTIFICATION
* contrib/wal2json/wal2json.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/genam.h"
#include "access/heapam.h"
#include "access/sysattr.h"
#include "catalog/indexing.h"
#include "catalog/pg_attrdef.h"
#include "catalog/pg_type.h"
#include "replication/logical.h"
#if PG_VERSION_NUM >= 90500
#include "replication/origin.h"
#endif
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/guc.h"
#include "utils/json.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/pg_lsn.h"
#include "utils/rel.h"
#include "utils/syscache.h"
#define WAL2JSON_VERSION "2.6"
#define WAL2JSON_VERSION_NUM 206
#define WAL2JSON_FORMAT_VERSION 2
#define WAL2JSON_FORMAT_MIN_VERSION 1
PG_MODULE_MAGIC;
extern void _PG_init(void);
extern void PGDLLEXPORT _PG_output_plugin_init(OutputPluginCallbacks *cb);
typedef struct
{
bool insert;
bool update;
bool delete;
bool truncate;
} JsonAction;
typedef struct
{
MemoryContext context;
bool include_transaction; /* BEGIN and COMMIT objects (v2) */
bool include_xids; /* include transaction ids */
bool include_timestamp; /* include transaction timestamp */
bool include_origin; /* replication origin */
bool include_schemas; /* qualify tables */
bool include_types; /* include data types */
bool include_type_oids; /* include data type oids */
bool include_typmod; /* include typmod in types */
bool include_domain_data_type; /* include underlying data type of the domain */
bool include_column_positions; /* include column numbers */
bool include_not_null; /* include not-null constraints */
bool include_default; /* include default expressions */
bool include_pk; /* include primary key */
bool pretty_print; /* pretty-print JSON? */
bool write_in_chunks; /* write in chunks? (v1) */
bool numeric_data_types_as_string; /* use strings for numeric data types */
JsonAction actions; /* output only these actions */
List *filter_origins; /* filter out origins */
List *filter_tables; /* filter out tables */
List *add_tables; /* add only these tables */
List *filter_msg_prefixes; /* filter by message prefixes */
List *add_msg_prefixes; /* add only messages with these prefixes */
int format_version; /* support different formats */
/*
* LSN pointing to the end of commit record + 1 (txn->end_lsn)
* It is useful for tools that wants a position to restart from.
*/
bool include_lsn; /* include LSNs */
uint64 nr_changes; /* # of passes in pg_decode_change() */
/* FIXME replace with txn->nentries */
/* pretty print */
char ht[2]; /* horizontal tab, if pretty print */
char nl[2]; /* new line, if pretty print */
char sp[2]; /* space, if pretty print */
} JsonDecodingData;
typedef enum
{
PGOUTPUTJSON_CHANGE,
PGOUTPUTJSON_IDENTITY,
PGOUTPUTJSON_PK
} PGOutputJsonKind;
typedef struct SelectTable
{
char *schemaname;
char *tablename;
bool allschemas; /* true means any schema */
bool alltables; /* true means any table */
} SelectTable;
/* These must be available to pg_dlsym() */
static void pg_decode_startup(LogicalDecodingContext *ctx, OutputPluginOptions *opt, bool is_init);
static void pg_decode_shutdown(LogicalDecodingContext *ctx);
static void pg_decode_begin_txn(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn);
static void pg_decode_commit_txn(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn, XLogRecPtr commit_lsn);
static void pg_decode_change(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn, Relation rel,
ReorderBufferChange *change);
#if PG_VERSION_NUM >= 90500
static bool pg_filter_by_origin(LogicalDecodingContext *ctx, RepOriginId origin_id);
#endif
#if PG_VERSION_NUM >= 90600
static void pg_decode_message(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn, XLogRecPtr lsn,
bool transactional, const char *prefix,
Size content_size, const char *content);
#endif
#if PG_VERSION_NUM >= 110000
static void pg_decode_truncate(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn, int n, Relation relations[],
ReorderBufferChange *change);
#endif
static void columns_to_stringinfo(LogicalDecodingContext *ctx, TupleDesc tupdesc, HeapTuple tuple, bool addcomma, Relation relation);
static void tuple_to_stringinfo(LogicalDecodingContext *ctx, TupleDesc tupdesc, HeapTuple tuple, Bitmapset *bs, bool replident, bool addcomma, Relation relation);
static void pk_to_stringinfo(LogicalDecodingContext *ctx, TupleDesc tupdesc, HeapTuple tuple, Bitmapset *bs, bool addcomma);
static void identity_to_stringinfo(LogicalDecodingContext *ctx, TupleDesc tupdesc, HeapTuple tuple, Bitmapset *bs);
static bool parse_table_identifier(List *qualified_tables, char separator, List **select_tables);
static bool string_to_SelectTable(char *rawstring, char separator, List **select_tables);
static bool split_string_to_list(char *rawstring, char separator, List **sl);
static bool split_string_to_oid_list(char *rawstring, char separator, List **sl);
static bool pg_filter_by_action(int change_type, JsonAction actions);
static bool pg_filter_by_table(List *filter_tables, char *schemaname, char *tablename);
static bool pg_add_by_table(List *add_tables, char *schemaname, char *tablename);
/* version 1 */
static void pg_decode_begin_txn_v1(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn);
static void pg_decode_commit_txn_v1(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn, XLogRecPtr commit_lsn);
static void pg_decode_change_v1(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn, Relation rel,
ReorderBufferChange *change);
#if PG_VERSION_NUM >= 90600
static void pg_decode_message_v1(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn, XLogRecPtr lsn,
bool transactional, const char *prefix,
Size content_size, const char *content);
#endif
#if PG_VERSION_NUM >= 110000
static void pg_decode_truncate_v1(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn, int n, Relation relations[],
ReorderBufferChange *change);
#endif
/* version 2 */
static void pg_decode_begin_txn_v2(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn);
static void pg_decode_commit_txn_v2(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn, XLogRecPtr commit_lsn);
static void pg_decode_write_value(LogicalDecodingContext *ctx, Datum value, bool isnull, Oid typid);
static void pg_decode_write_tuple(LogicalDecodingContext *ctx, Relation relation, HeapTuple tuple, PGOutputJsonKind kind);
static void pg_decode_write_change(LogicalDecodingContext *ctx, ReorderBufferTXN *txn, Relation relation, ReorderBufferChange *change);
static void pg_decode_change_v2(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn, Relation rel,
ReorderBufferChange *change);
#if PG_VERSION_NUM >= 90600
static void pg_decode_message_v2(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn, XLogRecPtr lsn,
bool transactional, const char *prefix,
Size content_size, const char *content);
#endif
#if PG_VERSION_NUM >= 110000
static void pg_decode_truncate_v2(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn, int n, Relation relations[],
ReorderBufferChange *change);
#endif
/*
* Backward compatibility.
*
* This macro is only available in 9.6+.
*/
#if PG_VERSION_NUM < 90600
#ifdef USE_FLOAT8_BYVAL
#define UInt64GetDatum(X) ((Datum) (X))
#else
#define UInt64GetDatum(X) Int64GetDatum((int64) (X))
#endif
#endif
#if PG_VERSION_NUM >= 150000 && PG_VERSION_NUM < 160000
static void update_replication_progress(LogicalDecodingContext *ctx, bool skipped_xact);
#elif PG_VERSION_NUM >= 100000 && PG_VERSION_NUM < 150000
static void update_replication_progress(LogicalDecodingContext *ctx);
#endif
void
_PG_init(void)
{
}
/* Specify output plugin callbacks */
void
_PG_output_plugin_init(OutputPluginCallbacks *cb)
{
AssertVariableIsOfType(&_PG_output_plugin_init, LogicalOutputPluginInit);
cb->startup_cb = pg_decode_startup;
cb->begin_cb = pg_decode_begin_txn;
cb->change_cb = pg_decode_change;
cb->commit_cb = pg_decode_commit_txn;
cb->shutdown_cb = pg_decode_shutdown;
#if PG_VERSION_NUM >= 90500
cb->filter_by_origin_cb = pg_filter_by_origin;
#endif
#if PG_VERSION_NUM >= 90600
cb->message_cb = pg_decode_message;
#endif
#if PG_VERSION_NUM >= 110000
cb->truncate_cb = pg_decode_truncate;
#endif
}
/* Initialize this plugin */
static void
pg_decode_startup(LogicalDecodingContext *ctx, OutputPluginOptions *opt, bool is_init)
{
ListCell *option;
JsonDecodingData *data;
SelectTable *t;
data = palloc0(sizeof(JsonDecodingData));
data->context = AllocSetContextCreate(TopMemoryContext,
"wal2json output context",
#if PG_VERSION_NUM >= 90600
ALLOCSET_DEFAULT_SIZES
#else
ALLOCSET_DEFAULT_MINSIZE,
ALLOCSET_DEFAULT_INITSIZE,
ALLOCSET_DEFAULT_MAXSIZE
#endif
);
data->include_transaction = true;
data->include_xids = false;
data->include_timestamp = false;
data->include_pk = false;
data->include_origin = false;
data->include_schemas = true;
data->include_types = true;
data->include_type_oids = false;
data->include_typmod = true;
data->include_domain_data_type = false;
data->include_column_positions = false;
data->numeric_data_types_as_string = false;
data->pretty_print = false;
data->write_in_chunks = false;
data->include_lsn = false;
data->include_not_null = false;
data->include_default = false;
data->filter_origins = NIL;
data->filter_tables = NIL;
data->filter_msg_prefixes = NIL;
data->add_msg_prefixes = NIL;
data->format_version = 1;
/* default actions */
if (WAL2JSON_FORMAT_VERSION == 1)
{
data->actions.insert = true;
data->actions.update = true;
data->actions.delete = true;
data->actions.truncate = false; /* backward compatibility */
}
else
{
data->actions.insert = true;
data->actions.update = true;
data->actions.delete = true;
data->actions.truncate = true;
}
/* pretty print */
data->ht[0] = '\0';
data->nl[0] = '\0';
data->sp[0] = '\0';
/* add all tables in all schemas by default */
t = palloc0(sizeof(SelectTable));
t->allschemas = true;
t->alltables = true;
data->add_tables = lappend(data->add_tables, t);
data->nr_changes = 0;
ctx->output_plugin_private = data;
opt->output_type = OUTPUT_PLUGIN_TEXTUAL_OUTPUT;
foreach(option, ctx->output_plugin_options)
{
DefElem *elem = lfirst(option);
Assert(elem->arg == NULL || IsA(elem->arg, String));
if (strcmp(elem->defname, "include-transaction") == 0)
{
/* if option value is NULL then assume that value is true */
if (elem->arg == NULL)
data->include_transaction = true;
else if (!parse_bool(strVal(elem->arg), &data->include_transaction))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
else if (strcmp(elem->defname, "include-xids") == 0)
{
/* If option does not provide a value, it means its value is true */
if (elem->arg == NULL)
{
elog(DEBUG1, "include-xids argument is null");
data->include_xids = true;
}
else if (!parse_bool(strVal(elem->arg), &data->include_xids))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
else if (strcmp(elem->defname, "include-timestamp") == 0)
{
if (elem->arg == NULL)
{
elog(DEBUG1, "include-timestamp argument is null");
data->include_timestamp = true;
}
else if (!parse_bool(strVal(elem->arg), &data->include_timestamp))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
else if (strcmp(elem->defname, "include-pk") == 0)
{
if (elem->arg == NULL)
{
elog(DEBUG1, "include-pk argument is null");
data->include_pk = true;
}
else if (!parse_bool(strVal(elem->arg), &data->include_pk))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
else if (strcmp(elem->defname, "include-origin") == 0)
{
if (elem->arg == NULL)
{
elog(DEBUG1, "include-origin argument is null");
data->include_origin = true;
}
else if (!parse_bool(strVal(elem->arg), &data->include_origin))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
else if (strcmp(elem->defname, "include-schemas") == 0)
{
if (elem->arg == NULL)
{
elog(DEBUG1, "include-schemas argument is null");
data->include_schemas = true;
}
else if (!parse_bool(strVal(elem->arg), &data->include_schemas))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
else if (strcmp(elem->defname, "include-types") == 0)
{
if (elem->arg == NULL)
{
elog(DEBUG1, "include-types argument is null");
data->include_types = true;
}
else if (!parse_bool(strVal(elem->arg), &data->include_types))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
else if (strcmp(elem->defname, "include-type-oids") == 0)
{
if (elem->arg == NULL)
{
elog(DEBUG1, "include-type-oids argument is null");
data->include_type_oids = true;
}
else if (!parse_bool(strVal(elem->arg), &data->include_type_oids))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
else if (strcmp(elem->defname, "include-typmod") == 0)
{
if (elem->arg == NULL)
{
elog(DEBUG1, "include-typmod argument is null");
data->include_typmod = true;
}
else if (!parse_bool(strVal(elem->arg), &data->include_typmod))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
else if (strcmp(elem->defname, "include-domain-data-type") == 0)
{
if (elem->arg == NULL)
{
elog(DEBUG1, "include-types argument is null");
data->include_domain_data_type = true;
}
else if (!parse_bool(strVal(elem->arg), &data->include_domain_data_type))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
else if (strcmp(elem->defname, "include-column-positions") == 0)
{
if (elem->arg == NULL)
{
elog(DEBUG1, "include-column-positions argument is null");
data->include_column_positions = true;
}
else if (!parse_bool(strVal(elem->arg), &data->include_column_positions))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
else if (strcmp(elem->defname, "include-not-null") == 0)
{
if (elem->arg == NULL)
{
elog(DEBUG1, "include-not-null argument is null");
data->include_not_null = true;
}
else if (!parse_bool(strVal(elem->arg), &data->include_not_null))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
else if (strcmp(elem->defname, "include-default") == 0)
{
if (elem->arg == NULL)
{
elog(DEBUG1, "include-default argument is null");
data->include_default = true;
}
else if (!parse_bool(strVal(elem->arg), &data->include_default))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
else if (strcmp(elem->defname, "numeric-data-types-as-string") == 0)
{
if (elem->arg == NULL)
{
elog(DEBUG1, "numeric-data-types-as-string argument is null");
data->numeric_data_types_as_string = true;
}
else if (!parse_bool(strVal(elem->arg), &data->numeric_data_types_as_string))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
else if (strcmp(elem->defname, "pretty-print") == 0)
{
if (elem->arg == NULL)
{
elog(DEBUG1, "pretty-print argument is null");
data->pretty_print = true;
}
else if (!parse_bool(strVal(elem->arg), &data->pretty_print))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
if (data->pretty_print)
{
data->ht[0] = '\t';
data->nl[0] = '\n';
data->sp[0] = ' ';
}
}
else if (strcmp(elem->defname, "write-in-chunks") == 0)
{
if (elem->arg == NULL)
{
elog(DEBUG1, "write-in-chunks argument is null");
data->write_in_chunks = true;
}
else if (!parse_bool(strVal(elem->arg), &data->write_in_chunks))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
else if (strcmp(elem->defname, "include-lsn") == 0)
{
if (elem->arg == NULL)
{
elog(DEBUG1, "include-lsn argument is null");
data->include_lsn = true;
}
else if (!parse_bool(strVal(elem->arg), &data->include_lsn))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
else if (strcmp(elem->defname, "include-unchanged-toast") == 0)
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_NAME),
errmsg("parameter \"%s\" was deprecated", elem->defname)));
}
else if (strcmp(elem->defname, "actions") == 0)
{
char *rawstr;
if (elem->arg == NULL)
{
elog(DEBUG1, "actions argument is null");
/* argument null means default; nothing to do here */
}
else
{
List *selected_actions = NIL;
ListCell *lc;
rawstr = pstrdup(strVal(elem->arg));
if (!split_string_to_list(rawstr, ',', &selected_actions))
{
pfree(rawstr);
ereport(ERROR,
(errcode(ERRCODE_INVALID_NAME),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
data->actions.insert = false;
data->actions.update = false;
data->actions.delete = false;
data->actions.truncate = false;
foreach(lc, selected_actions)
{
char *p = lfirst(lc);
if (strcmp(p, "insert") == 0)
data->actions.insert = true;
else if (strcmp(p, "update") == 0)
data->actions.update = true;
else if (strcmp(p, "delete") == 0)
data->actions.delete = true;
else if (strcmp(p, "truncate") == 0)
data->actions.truncate = true;
else
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
p, elem->defname)));
}
pfree(rawstr);
list_free(selected_actions);
}
}
else if (strcmp(elem->defname, "filter-origins") == 0)
{
char *rawstr;
if (elem->arg == NULL)
{
elog(DEBUG1, "filter-origins argument is null");
data->filter_origins = NIL;
}
else
{
rawstr = pstrdup(strVal(elem->arg));
if (!split_string_to_oid_list(rawstr, ',', &data->filter_origins))
{
pfree(rawstr);
ereport(ERROR,
(errcode(ERRCODE_INVALID_NAME),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
pfree(rawstr);
}
}
else if (strcmp(elem->defname, "filter-tables") == 0)
{
char *rawstr;
if (elem->arg == NULL)
{
elog(DEBUG1, "filter-tables argument is null");
data->filter_tables = NIL;
}
else
{
rawstr = pstrdup(strVal(elem->arg));
if (!string_to_SelectTable(rawstr, ',', &data->filter_tables))
{
pfree(rawstr);
ereport(ERROR,
(errcode(ERRCODE_INVALID_NAME),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
pfree(rawstr);
}
}
else if (strcmp(elem->defname, "add-tables") == 0)
{
char *rawstr;
/*
* If this parameter is specified, remove 'all tables in all
* schemas' value from list.
*/
list_free_deep(data->add_tables);
data->add_tables = NIL;
if (elem->arg == NULL)
{
elog(DEBUG1, "add-tables argument is null");
data->add_tables = NIL;
}
else
{
rawstr = pstrdup(strVal(elem->arg));
if (!string_to_SelectTable(rawstr, ',', &data->add_tables))
{
pfree(rawstr);
ereport(ERROR,
(errcode(ERRCODE_INVALID_NAME),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
pfree(rawstr);
}
}
else if (strcmp(elem->defname, "filter-msg-prefixes") == 0)
{
char *rawstr;
if (elem->arg == NULL)
{
elog(DEBUG1, "filter-msg-prefixes argument is null");
data->filter_msg_prefixes = NIL;
}
else
{
rawstr = pstrdup(strVal(elem->arg));
if (!split_string_to_list(rawstr, ',', &data->filter_msg_prefixes))
{
pfree(rawstr);
ereport(ERROR,
(errcode(ERRCODE_INVALID_NAME),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
pfree(rawstr);
}
}
else if (strcmp(elem->defname, "add-msg-prefixes") == 0)
{
char *rawstr;
if (elem->arg == NULL)
{
elog(DEBUG1, "add-msg-prefixes argument is null");
data->add_msg_prefixes = NIL;
}
else
{
rawstr = pstrdup(strVal(elem->arg));
if (!split_string_to_list(rawstr, ',', &data->add_msg_prefixes))
{
pfree(rawstr);
ereport(ERROR,
(errcode(ERRCODE_INVALID_NAME),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
}
pfree(rawstr);
}
}
else if (strcmp(elem->defname, "format-version") == 0)
{
if (elem->arg == NULL)
{
elog(DEBUG1, "format-version argument is null");
data->format_version = WAL2JSON_FORMAT_VERSION;
}
else if (!parse_int(strVal(elem->arg), &data->format_version, 0, NULL))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("could not parse value \"%s\" for parameter \"%s\"",
strVal(elem->arg), elem->defname)));
if (data->format_version > WAL2JSON_FORMAT_VERSION)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("client sent format_version=%d but we only support format %d or lower",
data->format_version, WAL2JSON_FORMAT_VERSION)));
if (data->format_version < WAL2JSON_FORMAT_MIN_VERSION)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("client sent format_version=%d but we only support format %d or higher",
data->format_version, WAL2JSON_FORMAT_MIN_VERSION)));
}
else
{
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("option \"%s\" = \"%s\" is unknown",
elem->defname,
elem->arg ? strVal(elem->arg) : "(null)")));
}
}
elog(DEBUG2, "format version: %d", data->format_version);
}
/* cleanup this plugin's resources */
static void
pg_decode_shutdown(LogicalDecodingContext *ctx)
{
JsonDecodingData *data = ctx->output_plugin_private;
/* cleanup our own resources via memory context reset */
MemoryContextDelete(data->context);
}
#if PG_VERSION_NUM >= 90500
static bool
pg_filter_by_origin(LogicalDecodingContext *ctx, RepOriginId origin_id)
{
JsonDecodingData *data = ctx->output_plugin_private;
elog(DEBUG3, "origin: %u", origin_id);
/* changes produced locally are never filtered */
if (origin_id == InvalidRepOriginId)
return false;
/* Filter origins, if available */
if (list_length(data->filter_origins) > 0 && list_member_oid(data->filter_origins, origin_id))
{
elog(DEBUG2, "origin \"%u\" was filtered out", origin_id);
return true;
}
/*
* There isn't a list of origins to filter or origin is not contained in
* the filter list hence forward to all subscribers.
*/
return false;
}
#endif
/* BEGIN callback */
static void
pg_decode_begin_txn(LogicalDecodingContext *ctx, ReorderBufferTXN *txn)
{
JsonDecodingData *data = ctx->output_plugin_private;
if (data->format_version == 2)
pg_decode_begin_txn_v2(ctx, txn);
else if (data->format_version == 1)
pg_decode_begin_txn_v1(ctx, txn);
else
elog(ERROR, "format version %d is not supported", data->format_version);
}
static void
pg_decode_begin_txn_v1(LogicalDecodingContext *ctx, ReorderBufferTXN *txn)
{
JsonDecodingData *data = ctx->output_plugin_private;
data->nr_changes = 0;
/* Transaction starts */
OutputPluginPrepareWrite(ctx, true);
appendStringInfo(ctx->out, "{%s", data->nl);
if (data->include_xids)
appendStringInfo(ctx->out, "%s\"xid\":%s%u,%s", data->ht, data->sp, txn->xid, data->nl);
if (data->include_lsn)
{
char *lsn_str = DatumGetCString(DirectFunctionCall1(pg_lsn_out, UInt64GetDatum(txn->end_lsn)));
appendStringInfo(ctx->out, "%s\"nextlsn\":%s\"%s\",%s", data->ht, data->sp, lsn_str, data->nl);
pfree(lsn_str);
}
#if PG_VERSION_NUM >= 150000
if (data->include_timestamp)
appendStringInfo(ctx->out, "%s\"timestamp\":%s\"%s\",%s", data->ht, data->sp, timestamptz_to_str(txn->xact_time.commit_time), data->nl);
#else
if (data->include_timestamp)
appendStringInfo(ctx->out, "%s\"timestamp\":%s\"%s\",%s", data->ht, data->sp, timestamptz_to_str(txn->commit_time), data->nl);
#endif
#if PG_VERSION_NUM >= 90500
if (data->include_origin)
appendStringInfo(ctx->out, "%s\"origin\":%s%u,%s", data->ht, data->sp, txn->origin_id, data->nl);
#endif
appendStringInfo(ctx->out, "%s\"change\":%s[", data->ht, data->sp);
if (data->write_in_chunks)
OutputPluginWrite(ctx, true);
}
static void
pg_decode_begin_txn_v2(LogicalDecodingContext *ctx, ReorderBufferTXN *txn)
{
JsonDecodingData *data = ctx->output_plugin_private;
/* don't include BEGIN object */
if (!data->include_transaction)
return;
OutputPluginPrepareWrite(ctx, true);
appendStringInfoString(ctx->out, "{\"action\":\"B\"");
if (data->include_xids)
appendStringInfo(ctx->out, ",\"xid\":%u", txn->xid);
#if PG_VERSION_NUM >= 150000
if (data->include_timestamp)
appendStringInfo(ctx->out, ",\"timestamp\":\"%s\"", timestamptz_to_str(txn->xact_time.commit_time));
#else
if (data->include_timestamp)
appendStringInfo(ctx->out, ",\"timestamp\":\"%s\"", timestamptz_to_str(txn->commit_time));
#endif
#if PG_VERSION_NUM >= 90500
if (data->include_origin)
appendStringInfo(ctx->out, ",\"origin\":%u", txn->origin_id);
#endif
if (data->include_lsn)
{
char *lsn_str = DatumGetCString(DirectFunctionCall1(pg_lsn_out, UInt64GetDatum(txn->final_lsn)));
appendStringInfo(ctx->out, ",\"lsn\":\"%s\"", lsn_str);
pfree(lsn_str);
lsn_str = DatumGetCString(DirectFunctionCall1(pg_lsn_out, UInt64GetDatum(txn->end_lsn)));
appendStringInfo(ctx->out, ",\"nextlsn\":\"%s\"", lsn_str);
pfree(lsn_str);
}
appendStringInfoChar(ctx->out, '}');
OutputPluginWrite(ctx, true);
}
/* COMMIT callback */
static void
pg_decode_commit_txn(LogicalDecodingContext *ctx, ReorderBufferTXN *txn,
XLogRecPtr commit_lsn)
{
JsonDecodingData *data = ctx->output_plugin_private;
/*
* Some older minor versions from back branches (10 to 14) calls
* OutputPluginUpdateProgress(). That's before the fix
* f95d53eded55ecbf037f6416ced6af29a2c3caca. After that,
* update_replication_progress() function is used for back branches. In
* version 15, update_replication_progress() changes the signature to
* support skipped transactions. In version 16,
* OutputPluginUpdateProgress() is back because a proper fix was added into
* logical decoding.
*/
#if PG_VERSION_NUM >= 160000
OutputPluginUpdateProgress(ctx, false); /* XXX change 2nd param when skipped empty transaction is supported */
#elif PG_VERSION_NUM >= 150000 && PG_VERSION_NUM < 160000
update_replication_progress(ctx, false); /* XXX change 2nd param when skipped empty transaction is supported */
#elif PG_VERSION_NUM >= 140004 && PG_VERSION_NUM < 150000
update_replication_progress(ctx);
#elif PG_VERSION_NUM >= 130008 && PG_VERSION_NUM < 140000
update_replication_progress(ctx);
#elif PG_VERSION_NUM >= 120012 && PG_VERSION_NUM < 130000
update_replication_progress(ctx);
#elif PG_VERSION_NUM >= 110017 && PG_VERSION_NUM < 120000
update_replication_progress(ctx);
#elif PG_VERSION_NUM >= 100022 && PG_VERSION_NUM < 110000
update_replication_progress(ctx);
#elif PG_VERSION_NUM >= 140000 && PG_VERSION_NUM < 140004
OutputPluginUpdateProgress(ctx);
#elif PG_VERSION_NUM >= 130000 && PG_VERSION_NUM < 130008
OutputPluginUpdateProgress(ctx);
#elif PG_VERSION_NUM >= 120000 && PG_VERSION_NUM < 120012
OutputPluginUpdateProgress(ctx);
#elif PG_VERSION_NUM >= 110000 && PG_VERSION_NUM < 110017
OutputPluginUpdateProgress(ctx);
#elif PG_VERSION_NUM >= 100000 && PG_VERSION_NUM < 100022
OutputPluginUpdateProgress(ctx);
#endif
elog(DEBUG2, "my change counter: " UINT64_FORMAT " ; # of changes: " UINT64_FORMAT " ; # of changes in memory: " UINT64_FORMAT, data->nr_changes, txn->nentries, txn->nentries_mem);
elog(DEBUG2, "# of subxacts: %d", txn->nsubtxns);
if (data->format_version == 2)
pg_decode_commit_txn_v2(ctx, txn, commit_lsn);
else if (data->format_version == 1)
pg_decode_commit_txn_v1(ctx, txn, commit_lsn);
else
elog(ERROR, "format version %d is not supported", data->format_version);
}
static void
pg_decode_commit_txn_v1(LogicalDecodingContext *ctx, ReorderBufferTXN *txn,
XLogRecPtr commit_lsn)
{
JsonDecodingData *data = ctx->output_plugin_private;
/* Transaction ends */
if (data->write_in_chunks)
OutputPluginPrepareWrite(ctx, true);
/* if we don't write in chunks, we need a newline here */
if (!data->write_in_chunks)
appendStringInfo(ctx->out, "%s", data->nl);
appendStringInfo(ctx->out, "%s]%s}", data->ht, data->nl);
OutputPluginWrite(ctx, true);
}
static void
pg_decode_commit_txn_v2(LogicalDecodingContext *ctx, ReorderBufferTXN *txn,
XLogRecPtr commit_lsn)
{
JsonDecodingData *data = ctx->output_plugin_private;
/* don't include COMMIT object */
if (!data->include_transaction)
return;
OutputPluginPrepareWrite(ctx, true);
appendStringInfoString(ctx->out, "{\"action\":\"C\"");
if (data->include_xids)
appendStringInfo(ctx->out, ",\"xid\":%u", txn->xid);
#if PG_VERSION_NUM >= 150000
if (data->include_timestamp)
appendStringInfo(ctx->out, ",\"timestamp\":\"%s\"", timestamptz_to_str(txn->xact_time.commit_time));
#else
if (data->include_timestamp)
appendStringInfo(ctx->out, ",\"timestamp\":\"%s\"", timestamptz_to_str(txn->commit_time));