364 lines
12 KiB
C++
364 lines
12 KiB
C++
/*-------------------------------------------------------------------------
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*
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* test_decoding.c
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* example logical decoding output plugin
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*
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* Copyright (c) 2012-2014, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* contrib/test_decoding/test_decoding.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "knl/knl_variable.h"
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#include "access/sysattr.h"
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#include "catalog/pg_class.h"
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#include "catalog/pg_type.h"
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#include "nodes/parsenodes.h"
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#include "utils/builtins.h"
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#include "utils/lsyscache.h"
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#include "utils/memutils.h"
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#include "utils/rel.h"
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#include "utils/relcache.h"
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#include "utils/syscache.h"
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#include "utils/typcache.h"
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#include "replication/output_plugin.h"
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#include "replication/logical.h"
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PG_MODULE_MAGIC;
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/* These must be available to pg_dlsym() */
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extern "C" void _PG_init(void);
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extern "C" void _PG_output_plugin_init(OutputPluginCallbacks* cb);
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static void pg_decode_startup(LogicalDecodingContext* ctx, OutputPluginOptions* opt, bool is_init);
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static void pg_decode_shutdown(LogicalDecodingContext* ctx);
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static void pg_decode_begin_txn(LogicalDecodingContext* ctx, ReorderBufferTXN* txn);
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static void pg_output_begin(
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LogicalDecodingContext* ctx, PluginTestDecodingData* data, ReorderBufferTXN* txn, bool last_write);
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static void pg_decode_commit_txn(LogicalDecodingContext* ctx, ReorderBufferTXN* txn, XLogRecPtr commit_lsn);
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static void pg_decode_abort_txn(LogicalDecodingContext* ctx, ReorderBufferTXN* txn);
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static void pg_decode_prepare_txn(LogicalDecodingContext* ctx, ReorderBufferTXN* txn);
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static void pg_decode_change(
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LogicalDecodingContext* ctx, ReorderBufferTXN* txn, Relation rel, ReorderBufferChange* change);
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static bool pg_decode_filter(LogicalDecodingContext* ctx, RepOriginId origin_id);
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void _PG_init(void)
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{
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/* other plugins can perform things here */
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}
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/* specify output plugin callbacks */
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void _PG_output_plugin_init(OutputPluginCallbacks* cb)
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{
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AssertVariableIsOfType(&_PG_output_plugin_init, LogicalOutputPluginInit);
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cb->startup_cb = pg_decode_startup;
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cb->begin_cb = pg_decode_begin_txn;
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cb->change_cb = pg_decode_change;
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cb->commit_cb = pg_decode_commit_txn;
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cb->abort_cb = pg_decode_abort_txn;
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cb->prepare_cb = pg_decode_prepare_txn;
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cb->filter_by_origin_cb = pg_decode_filter;
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cb->shutdown_cb = pg_decode_shutdown;
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}
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/* initialize this plugin */
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static void pg_decode_startup(LogicalDecodingContext* ctx, OutputPluginOptions* opt, bool is_init)
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{
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ListCell* option = NULL;
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PluginTestDecodingData* data = NULL;
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data = (PluginTestDecodingData*)palloc0(sizeof(PluginTestDecodingData));
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data->context = AllocSetContextCreate(ctx->context,
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"text conversion context",
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ALLOCSET_DEFAULT_MINSIZE,
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ALLOCSET_DEFAULT_INITSIZE,
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ALLOCSET_DEFAULT_MAXSIZE);
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data->include_xids = true;
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data->include_timestamp = true;
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data->skip_empty_xacts = false;
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data->only_local = true;
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data->tableWhiteList = NIL;
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ctx->output_plugin_private = data;
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opt->output_type = OUTPUT_PLUGIN_TEXTUAL_OUTPUT;
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foreach (option, ctx->output_plugin_options) {
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ParseDecodingOptionPlugin(option, data, opt);
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}
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}
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/* cleanup this plugin's resources */
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static void pg_decode_shutdown(LogicalDecodingContext* ctx)
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{
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PluginTestDecodingData* data = (PluginTestDecodingData*)ctx->output_plugin_private;
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/* cleanup our own resources via memory context reset */
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MemoryContextDelete(data->context);
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}
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/* BEGIN callback */
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static void pg_decode_begin_txn(LogicalDecodingContext* ctx, ReorderBufferTXN* txn)
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{
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PluginTestDecodingData* data = (PluginTestDecodingData*)ctx->output_plugin_private;
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data->xact_wrote_changes = false;
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if (data->skip_empty_xacts) {
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return;
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}
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pg_output_begin(ctx, data, txn, true);
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}
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static void pg_output_begin(LogicalDecodingContext* ctx, PluginTestDecodingData* data, ReorderBufferTXN* txn,
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bool last_write)
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{
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OutputPluginPrepareWrite(ctx, last_write);
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if (data->include_xids)
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appendStringInfo(ctx->out, "BEGIN %lu", txn->xid);
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else
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appendStringInfoString(ctx->out, "BEGIN");
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OutputPluginWrite(ctx, last_write);
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}
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/* COMMIT callback */
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static void pg_decode_commit_txn(LogicalDecodingContext* ctx, ReorderBufferTXN* txn, XLogRecPtr commit_lsn)
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{
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PluginTestDecodingData* data = (PluginTestDecodingData*)ctx->output_plugin_private;
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if (data->skip_empty_xacts && !data->xact_wrote_changes)
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return;
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OutputPluginPrepareWrite(ctx, true);
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if (data->include_xids)
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appendStringInfo(ctx->out, "COMMIT %lu", txn->xid);
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else
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appendStringInfoString(ctx->out, "COMMIT");
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if (data->include_timestamp)
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appendStringInfo(ctx->out, " (at %s)", timestamptz_to_str(txn->commit_time));
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appendStringInfo(ctx->out, " CSN %lu", txn->csn);
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OutputPluginWrite(ctx, true);
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}
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/* ABORT callback */
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static void pg_decode_abort_txn(LogicalDecodingContext* ctx, ReorderBufferTXN* txn)
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{
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PluginTestDecodingData* data = (PluginTestDecodingData*)ctx->output_plugin_private;
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if (data->skip_empty_xacts && !data->xact_wrote_changes)
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return;
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OutputPluginPrepareWrite(ctx, true);
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if (data->include_xids)
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appendStringInfo(ctx->out, "ABORT %lu", txn->xid);
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else
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appendStringInfoString(ctx->out, "ABORT");
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if (data->include_timestamp)
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appendStringInfo(ctx->out, " (at %s)", timestamptz_to_str(txn->commit_time));
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OutputPluginWrite(ctx, true);
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}
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/* PREPARE callback */
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static void pg_decode_prepare_txn(LogicalDecodingContext* ctx, ReorderBufferTXN* txn)
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{
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PluginTestDecodingData* data = (PluginTestDecodingData*)ctx->output_plugin_private;
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if (data->skip_empty_xacts && !data->xact_wrote_changes)
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return;
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OutputPluginPrepareWrite(ctx, true);
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if (data->include_xids)
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appendStringInfo(ctx->out, "PREPARE %lu", txn->xid);
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else
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appendStringInfoString(ctx->out, "PREPARE");
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if (data->include_timestamp)
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appendStringInfo(ctx->out, " (at %s)", timestamptz_to_str(txn->commit_time));
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OutputPluginWrite(ctx, true);
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}
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static bool pg_decode_filter(LogicalDecodingContext* ctx, RepOriginId origin_id)
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{
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PluginTestDecodingData* data = (PluginTestDecodingData*)ctx->output_plugin_private;
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if (data->only_local && origin_id != InvalidRepOriginId)
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return true;
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return false;
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}
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static void tuple_to_stringinfo(StringInfo s, TupleDesc tupdesc, HeapTuple tuple, bool skip_nulls)
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{
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if (HEAP_TUPLE_IS_COMPRESSED(tuple->t_data))
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return;
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if ((int)HeapTupleHeaderGetNatts(tuple->t_data, tupdesc) != tupdesc->natts)
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return;
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int natt;
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Oid oid;
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/* print oid of tuple, it's not included in the TupleDesc */
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if ((oid = HeapTupleHeaderGetOid(tuple->t_data)) != InvalidOid) {
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appendStringInfo(s, " oid[oid]:%u", oid);
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}
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/* print all columns individually */
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for (natt = 0; natt < tupdesc->natts; natt++) {
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Form_pg_attribute attr; /* the attribute itself */
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Oid typid; /* type of current attribute */
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Oid typoutput; /* output function */
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bool typisvarlena = false;
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Datum origval; /* possibly toasted Datum */
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bool isnull = true; /* column is null? */
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attr = tupdesc->attrs[natt];
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/*
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* don't print dropped columns, we can't be sure everything is
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* available for them
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*/
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if (attr->attisdropped)
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continue;
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/*
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* Don't print system columns, oid will already have been printed if
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* present.
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*/
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if (attr->attnum < 0)
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continue;
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typid = attr->atttypid;
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/* get Datum from tuple */
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origval = heap_getattr(tuple, natt + 1, tupdesc, &isnull);
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if (isnull && skip_nulls)
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continue;
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/* print attribute name */
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appendStringInfoChar(s, ' ');
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appendStringInfoString(s, quote_identifier(NameStr(attr->attname)));
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/* print attribute type */
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appendStringInfoChar(s, '[');
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char* type_name = format_type_be(typid);
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if (strlen(type_name) == strlen("clob") && strncmp(type_name, "clob", strlen("clob")) == 0) {
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errno_t rc = strcpy_s(type_name, sizeof("clob"), "text");
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securec_check_c(rc, "\0", "\0");
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}
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appendStringInfoString(s, type_name);
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appendStringInfoChar(s, ']');
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/* query output function */
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getTypeOutputInfo(typid, &typoutput, &typisvarlena);
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/* print separator */
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appendStringInfoChar(s, ':');
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/* print data */
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if (isnull)
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appendStringInfoString(s, "null");
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else if (typisvarlena && VARATT_IS_EXTERNAL_ONDISK_B(origval))
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appendStringInfoString(s, "unchanged-toast-datum");
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else if (!typisvarlena)
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PrintLiteral(s, typid, OidOutputFunctionCall(typoutput, origval));
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else {
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Datum val; /* definitely detoasted Datum */
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val = PointerGetDatum(PG_DETOAST_DATUM(origval));
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PrintLiteral(s, typid, OidOutputFunctionCall(typoutput, val));
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}
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}
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}
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/*
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* callback for individual changed tuples
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*/
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static void pg_decode_change(
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LogicalDecodingContext* ctx, ReorderBufferTXN* txn, Relation relation, ReorderBufferChange* change)
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{
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PluginTestDecodingData* data = NULL;
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Form_pg_class class_form;
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TupleDesc tupdesc;
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MemoryContext old;
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data = (PluginTestDecodingData*)ctx->output_plugin_private;
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/* output BEGIN if we haven't yet */
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if (data->skip_empty_xacts && !data->xact_wrote_changes) {
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pg_output_begin(ctx, data, txn, false);
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}
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data->xact_wrote_changes = true;
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class_form = RelationGetForm(relation);
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tupdesc = RelationGetDescr(relation);
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/* Avoid leaking memory by using and resetting our own context */
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old = MemoryContextSwitchTo(data->context);
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char *schema = get_namespace_name(class_form->relnamespace);
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char *table = NameStr(class_form->relname);
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if (data->tableWhiteList != NIL && !CheckWhiteList(data->tableWhiteList, schema, table)) {
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(void)MemoryContextSwitchTo(old);
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MemoryContextReset(data->context);
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return;
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}
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OutputPluginPrepareWrite(ctx, true);
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appendStringInfoString(ctx->out, "table ");
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appendStringInfoString(ctx->out, quote_qualified_identifier(schema, table));
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appendStringInfoString(ctx->out, ":");
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switch (change->action) {
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case REORDER_BUFFER_CHANGE_INSERT:
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appendStringInfoString(ctx->out, " INSERT:");
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if (change->data.tp.newtuple == NULL)
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appendStringInfoString(ctx->out, " (no-tuple-data)");
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else
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tuple_to_stringinfo(ctx->out, tupdesc, &change->data.tp.newtuple->tuple, false);
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break;
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case REORDER_BUFFER_CHANGE_UPDATE:
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appendStringInfoString(ctx->out, " UPDATE:");
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if (change->data.tp.oldtuple != NULL) {
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appendStringInfoString(ctx->out, " old-key:");
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tuple_to_stringinfo(ctx->out, tupdesc, &change->data.tp.oldtuple->tuple, true);
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appendStringInfoString(ctx->out, " new-tuple:");
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}
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if (change->data.tp.newtuple == NULL)
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appendStringInfoString(ctx->out, " (no-tuple-data)");
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else
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tuple_to_stringinfo(ctx->out, tupdesc, &change->data.tp.newtuple->tuple, false);
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break;
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case REORDER_BUFFER_CHANGE_DELETE:
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appendStringInfoString(ctx->out, " DELETE:");
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/* if there was no PK, we only know that a delete happened */
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if (change->data.tp.oldtuple == NULL)
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appendStringInfoString(ctx->out, " (no-tuple-data)");
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/* In DELETE, only the replica identity is present; display that */
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else
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tuple_to_stringinfo(ctx->out, tupdesc, &change->data.tp.oldtuple->tuple, true);
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break;
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default:
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Assert(false);
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}
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MemoryContextSwitchTo(old);
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MemoryContextReset(data->context);
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OutputPluginWrite(ctx, true);
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}
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