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DBZ-1052 Emit tx BEGIN/END messages

pull/25/head
Jiri Pechanec 2020-01-23 13:26:38 +01:00 committed by Gunnar Morling
parent 01126bfa89
commit 870ecfa976
4 changed files with 90 additions and 16 deletions
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2
proto/pg_logicaldec.proto
View File

@ -8,6 +8,8 @@ enum Op {
INSERT = 0;
UPDATE = 1;
DELETE = 2;
BEGIN = 3;
COMMIT = 4;
}
message Point {

86
src/decoderbufs.c
View File

@ -164,16 +164,6 @@ static void pg_decode_shutdown(LogicalDecodingContext *ctx) {
MemoryContextDelete(data->context);
}
/* BEGIN callback */
static void pg_decode_begin_txn(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn) {
}
/* COMMIT callback */
static void pg_decode_commit_txn(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn, XLogRecPtr commit_lsn) {
}
/* print tuple datums (only used for debug-mode) */
static void print_tuple_datums(StringInfo out, Decoderbufs__DatumMessage **tup,
size_t n) {
@ -491,6 +481,82 @@ static void add_metadata_to_msg(Decoderbufs__TypeInfo **tmsg,
}
}
/* BEGIN callback */
static void pg_decode_begin_txn(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn) {
DecoderData *data;
MemoryContext old;
Decoderbufs__RowMessage rmsg = DECODERBUFS__ROW_MESSAGE__INIT;
elog(DEBUG1, "Entering begin callback");
/* Avoid leaking memory by using and resetting our own context */
data = ctx->output_plugin_private;
old = MemoryContextSwitchTo(data->context);
rmsg.op = DECODERBUFS__OP__BEGIN;
rmsg.has_op = true;
rmsg.transaction_id = txn->xid;
rmsg.has_transaction_id = true;
rmsg.commit_time = TIMESTAMPTZ_TO_USEC_SINCE_EPOCH(txn->commit_time);
rmsg.has_commit_time = true;
/* write msg */
OutputPluginPrepareWrite(ctx, true);
if (data->debug_mode) {
print_row_msg(ctx->out, &rmsg);
} else {
size_t psize = decoderbufs__row_message__get_packed_size(&rmsg);
void *packed = palloc(psize);
size_t ssize = decoderbufs__row_message__pack(&rmsg, packed);
appendBinaryStringInfo(ctx->out, packed, ssize);
}
OutputPluginWrite(ctx, true);
/* Cleanup, freeing memory */
MemoryContextSwitchTo(old);
MemoryContextReset(data->context);
}
/* COMMIT callback */
static void pg_decode_commit_txn(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn, XLogRecPtr commit_lsn) {
DecoderData *data;
MemoryContext old;
Decoderbufs__RowMessage rmsg = DECODERBUFS__ROW_MESSAGE__INIT;
elog(DEBUG1, "Entering commit callback");
/* Avoid leaking memory by using and resetting our own context */
data = ctx->output_plugin_private;
old = MemoryContextSwitchTo(data->context);
rmsg.op = DECODERBUFS__OP__COMMIT;
rmsg.has_op = true;
rmsg.transaction_id = txn->xid;
rmsg.has_transaction_id = true;
rmsg.commit_time = TIMESTAMPTZ_TO_USEC_SINCE_EPOCH(txn->commit_time);
rmsg.has_commit_time = true;
/* write msg */
OutputPluginPrepareWrite(ctx, true);
if (data->debug_mode) {
print_row_msg(ctx->out, &rmsg);
} else {
size_t psize = decoderbufs__row_message__get_packed_size(&rmsg);
void *packed = palloc(psize);
size_t ssize = decoderbufs__row_message__pack(&rmsg, packed);
appendBinaryStringInfo(ctx->out, packed, ssize);
}
OutputPluginWrite(ctx, true);
/* Cleanup, freeing memory */
MemoryContextSwitchTo(old);
MemoryContextReset(data->context);
}
/* callback for individual changed tuples */
static void pg_decode_change(LogicalDecodingContext *ctx, ReorderBufferTXN *txn,
Relation relation, ReorderBufferChange *change) {

14
src/proto/pg_logicaldec.pb-c.c
View File

@ -565,17 +565,21 @@ const ProtobufCMessageDescriptor decoderbufs__row_message__descriptor =
(ProtobufCMessageInit) decoderbufs__row_message__init,
NULL,NULL,NULL /* reserved[123] */
};
static const ProtobufCEnumValue decoderbufs__op__enum_values_by_number[3] =
static const ProtobufCEnumValue decoderbufs__op__enum_values_by_number[5] =
{
{ "INSERT", "DECODERBUFS__OP__INSERT", 0 },
{ "UPDATE", "DECODERBUFS__OP__UPDATE", 1 },
{ "DELETE", "DECODERBUFS__OP__DELETE", 2 },
{ "BEGIN", "DECODERBUFS__OP__BEGIN", 3 },
{ "COMMIT", "DECODERBUFS__OP__COMMIT", 4 },
};
static const ProtobufCIntRange decoderbufs__op__value_ranges[] = {
{0, 0},{0, 3}
{0, 0},{0, 5}
};
static const ProtobufCEnumValueIndex decoderbufs__op__enum_values_by_name[3] =
static const ProtobufCEnumValueIndex decoderbufs__op__enum_values_by_name[5] =
{
{ "BEGIN", 3 },
{ "COMMIT", 4 },
{ "DELETE", 2 },
{ "INSERT", 0 },
{ "UPDATE", 1 },
@ -587,9 +591,9 @@ const ProtobufCEnumDescriptor decoderbufs__op__descriptor =
"Op",
"Decoderbufs__Op",
"decoderbufs",
3,
5,
decoderbufs__op__enum_values_by_number,
3,
5,
decoderbufs__op__enum_values_by_name,
1,
decoderbufs__op__value_ranges,

4
src/proto/pg_logicaldec.pb-c.h
View File

@ -26,7 +26,9 @@ typedef struct _Decoderbufs__RowMessage Decoderbufs__RowMessage;
typedef enum _Decoderbufs__Op {
DECODERBUFS__OP__INSERT = 0,
DECODERBUFS__OP__UPDATE = 1,
DECODERBUFS__OP__DELETE = 2
DECODERBUFS__OP__DELETE = 2,
DECODERBUFS__OP__BEGIN = 3,
DECODERBUFS__OP__COMMIT = 4
PROTOBUF_C__FORCE_ENUM_TO_BE_INT_SIZE(DECODERBUFS__OP)
} Decoderbufs__Op;