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spock_output_plugin.c
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/*-------------------------------------------------------------------------
*
* spock_output.c
* Logical Replication output plugin
*
* Copyright (c) 2022-2024, pgEdge, Inc.
* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, The Regents of the University of California
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.h>
#include "mb/pg_wchar.h"
#include "replication/logical.h"
#include "miscadmin.h"
#include "access/xact.h"
#include "executor/executor.h"
#include "catalog/namespace.h"
#include "storage/fd.h"
#include "storage/lmgr.h"
#include "utils/inval.h"
#include "utils/memutils.h"
#include "utils/rel.h"
#include "utils/snapmgr.h"
#include "utils/guc.h"
#include "replication/origin.h"
#include "replication/syncrep.h"
#include "replication/walsender_private.h"
#include "storage/ipc.h"
#include "spock_output_plugin.h"
#include "spock.h"
#include "spock_output_config.h"
#include "spock_executor.h"
#include "spock_node.h"
#include "spock_output_proto.h"
#include "spock_queue.h"
#include "spock_repset.h"
#include "spock_worker.h"
#ifdef HAVE_REPLICATION_ORIGINS
#include "replication/origin.h"
#endif
extern void _PG_output_plugin_init(OutputPluginCallbacks *cb);
/* Global variables */
bool spock_replication_repair_mode = false;
/* Local functions */
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);
static void pg_decode_message(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn,
XLogRecPtr message_lsn,
bool transactional,
const char *prefix,
Size message_size,
const char *message);
static void pg_decode_truncate(LogicalDecodingContext *ctx, ReorderBufferTXN *txn,
int nrelations, Relation relations[],
ReorderBufferChange *change);
#ifdef HAVE_REPLICATION_ORIGINS
static bool pg_decode_origin_filter(LogicalDecodingContext *ctx,
RepOriginId origin_id);
#endif
static void send_startup_message(LogicalDecodingContext *ctx,
SpockOutputData *data, bool last_message);
static void maybe_send_schema(LogicalDecodingContext *ctx,
ReorderBufferChange *change,
Relation relation);
static bool can_replicate_truncate(List *repsets);
static bool startup_message_sent = false;
typedef struct SPKRelMetaCacheEntry
{
Oid relid;
/* Does the client have this relation cached? */
bool is_cached;
/* Entry is valid and not due to be purged */
bool is_valid;
} SPKRelMetaCacheEntry;
#define RELMETACACHE_INITIAL_SIZE 128
static HTAB *RelMetaCache = NULL;
static MemoryContext RelMetaCacheContext = NULL;
static int InvalidRelMetaCacheCnt = 0;
static int MyWalSenderIdx = 0;
static bool slot_group_on_exit_set = false;
static SpockOutputSlotGroup *slot_group = NULL;
static bool slot_group_skip_xact = false;
static char *MyOutputNodeName = NULL;
static RepOriginId MyOutputNodeId = InvalidRepOriginId;
#if PG_VERSION_NUM >= 150000
static shmem_request_hook_type prev_shmem_request_hook = NULL;
#endif
static shmem_startup_hook_type prev_shmem_startup_hook = NULL;
static void spock_output_join_slot_group(NameData slot_name);
static void spock_output_leave_slot_group(void);
static void spock_output_plugin_shmem_request(void);
static void spock_output_plugin_shmem_startup(void);
static Size spock_output_plugin_shmem_size(int nworkers);
static void spock_output_plugin_on_exit(int code, Datum arg);
static void relmetacache_init(MemoryContext decoding_context);
static SPKRelMetaCacheEntry *relmetacache_get_relation(SpockOutputData *data,
Relation rel);
static void relmetacache_flush(void);
static void relmetacache_prune(void);
static void spkReorderBufferCleanSerializedTXNs(const char *slotname);
/* 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->message_cb = pg_decode_message;
cb->truncate_cb = pg_decode_truncate;
#ifdef HAVE_REPLICATION_ORIGINS
cb->filter_by_origin_cb = pg_decode_origin_filter;
#endif
cb->shutdown_cb = pg_decode_shutdown;
}
static bool
check_binary_compatibility(SpockOutputData *data)
{
if (data->client_binary_basetypes_major_version != PG_VERSION_NUM / 100)
return false;
if (data->client_binary_bigendian_set
&& data->client_binary_bigendian != server_bigendian())
{
elog(DEBUG1, "Binary mode rejected: Server and client endian mismatch");
return false;
}
if (data->client_binary_sizeofdatum != 0
&& data->client_binary_sizeofdatum != sizeof(Datum))
{
elog(DEBUG1, "Binary mode rejected: Server and client sizeof(Datum) mismatch");
return false;
}
if (data->client_binary_sizeofint != 0
&& data->client_binary_sizeofint != sizeof(int))
{
elog(DEBUG1, "Binary mode rejected: Server and client sizeof(int) mismatch");
return false;
}
if (data->client_binary_sizeoflong != 0
&& data->client_binary_sizeoflong != sizeof(long))
{
elog(DEBUG1, "Binary mode rejected: Server and client sizeof(long) mismatch");
return false;
}
if (data->client_binary_float4byval_set
&& data->client_binary_float4byval != server_float4_byval())
{
elog(DEBUG1, "Binary mode rejected: Server and client float4byval mismatch");
return false;
}
if (data->client_binary_float8byval_set
&& data->client_binary_float8byval != server_float8_byval())
{
elog(DEBUG1, "Binary mode rejected: Server and client float8byval mismatch");
return false;
}
if (data->client_binary_intdatetimes_set
&& data->client_binary_intdatetimes != server_integer_datetimes())
{
elog(DEBUG1, "Binary mode rejected: Server and client integer datetimes mismatch");
return false;
}
return true;
}
/* initialize this plugin */
static void
pg_decode_startup(LogicalDecodingContext * ctx, OutputPluginOptions *opt,
bool is_init)
{
SpockOutputData *data = palloc0(sizeof(SpockOutputData));
/* Join our slot-group if possible */
spock_output_join_slot_group(ctx->slot->data.name);
/* Short lived memory context for individual messages */
data->context = AllocSetContextCreate(ctx->context,
"spock output msg context",
ALLOCSET_DEFAULT_SIZES);
data->allow_internal_basetypes = false;
data->allow_binary_basetypes = false;
ctx->output_plugin_private = data;
/*
* This is replication start and not slot initialization.
*
* Parse and validate options passed by the client.
*/
if (!is_init)
{
int params_format;
bool started_tx = false;
SpockLocalNode *node;
MemoryContext oldctx;
/*
* Discover our WalSender slot index. We use this to work around a problem
* in SyncRepWaitForLSN() later.
*/
if (MyWalSnd != NULL)
MyWalSenderIdx = (MyWalSnd - WalSndCtl->walsnds) + 1;
/* Add slot to the hashtable */
lag_tracker_entry(NameStr(MyReplicationSlot->data.name), InvalidXLogRecPtr, 0);
/*
* There's a potential corruption bug in PostgreSQL 10.1, 9.6.6, 9.5.10
* and 9.4.15 that can cause reorder buffers to accumulate duplicated
* transactions. See
* https://www.postgresql.org/message-id/CAMsr+YHdX=XECbZshDZ2CZNWGTyw-taYBnzqVfx4JzM4ExP5xg@mail.gmail.com
*
* We can defend against this by doing our own cleanup of any serialized
* txns in the reorder buffer on startup.
*/
spkReorderBufferCleanSerializedTXNs(NameStr(MyReplicationSlot->data.name));
if (!IsTransactionState())
{
StartTransactionCommand();
started_tx = true;
}
node = get_local_node(false, false);
data->local_node_id = node->node->id;
/*
* Remember our own node.name for quick access out write_origin().
*/
oldctx = MemoryContextSwitchTo(TopMemoryContext);
MyOutputNodeName = pstrdup(node->node->name);
MyOutputNodeId = node->node->id;
MemoryContextSwitchTo(oldctx);
/*
* Ideally we'd send the startup message immediately. That way
* it'd arrive before any error we emit if we see incompatible
* options sent by the client here. That way the client could
* possibly adjust its options and reconnect. It'd also make
* sure the client gets the startup message in a timely way if
* the server is idle, since otherwise it could be a while
* before the next callback.
*
* The decoding plugin API doesn't let us write to the stream
* from here, though, so we have to delay the startup message
* until the first change processed on the stream, in a begin
* callback.
*
* If we ERROR there, the startup message is buffered but not
* sent since the callback didn't finish. So we'd have to send
* the startup message, finish the callback and check in the
* next callback if we need to ERROR.
*
* That's a bit much hoop jumping, so for now ERRORs are
* immediate. A way to emit a message from the startup callback
* is really needed to change that.
*/
startup_message_sent = false;
/* Now parse the rest of the params and ERROR if we see any we don't recognise */
oldctx = MemoryContextSwitchTo(ctx->context);
params_format = process_parameters(ctx->output_plugin_options, data);
MemoryContextSwitchTo(oldctx);
if (params_format != 1)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("client sent startup parameters in format %d but we only support format 1",
params_format)));
if (data->client_min_proto_version > SPOCK_PROTO_VERSION_NUM)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("client sent min_proto_version=%d but we only support protocol %d or lower",
data->client_min_proto_version, SPOCK_PROTO_VERSION_NUM)));
if (data->client_max_proto_version < SPOCK_PROTO_MIN_VERSION_NUM)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("client sent max_proto_version=%d but we only support protocol %d or higher",
data->client_max_proto_version, SPOCK_PROTO_MIN_VERSION_NUM)));
/*
* Set correct protocol format.
*
* This is the output plugin protocol format, this is different
* from the individual fields binary vs textual format.
*/
if (data->client_protocol_format != NULL
&& strcmp(data->client_protocol_format, "json") == 0)
{
oldctx = MemoryContextSwitchTo(ctx->context);
data->api = spock_init_api(SpockProtoJson);
opt->output_type = OUTPUT_PLUGIN_TEXTUAL_OUTPUT;
MemoryContextSwitchTo(oldctx);
}
else if ((data->client_protocol_format != NULL
&& strcmp(data->client_protocol_format, "native") == 0)
|| data->client_protocol_format == NULL)
{
oldctx = MemoryContextSwitchTo(ctx->context);
data->api = spock_init_api(SpockProtoNative);
opt->output_type = OUTPUT_PLUGIN_BINARY_OUTPUT;
if (data->client_no_txinfo)
{
elog(WARNING, "no_txinfo option ignored for protocols other than json");
data->client_no_txinfo = false;
}
MemoryContextSwitchTo(oldctx);
}
else
{
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("client requested protocol %s but only \"json\" or \"native\" are supported",
data->client_protocol_format)));
}
/* check for encoding match if specific encoding demanded by client */
if (data->client_expected_encoding != NULL
&& strlen(data->client_expected_encoding) != 0)
{
int wanted_encoding = pg_char_to_encoding(data->client_expected_encoding);
if (wanted_encoding == -1)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("unrecognised encoding name %s passed to expected_encoding",
data->client_expected_encoding)));
if (opt->output_type == OUTPUT_PLUGIN_TEXTUAL_OUTPUT)
{
/*
* datum encoding must match assigned client_encoding in text
* proto, since everything is subject to client_encoding
* conversion.
*/
if (wanted_encoding != pg_get_client_encoding())
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("expected_encoding must be unset or match client_encoding in text protocols")));
}
else
{
/*
* currently in the binary protocol we can only emit encoded
* datums in the server encoding. There's no support for encoding
* conversion.
*/
if (wanted_encoding != GetDatabaseEncoding())
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("encoding conversion for binary datum not supported yet"),
errdetail("expected_encoding %s must be unset or match server_encoding %s",
data->client_expected_encoding, GetDatabaseEncodingName())));
}
data->field_datum_encoding = wanted_encoding;
}
/*
* It's obviously not possible to send binary representation of data
* unless we use the binary output.
*/
if (opt->output_type == OUTPUT_PLUGIN_BINARY_OUTPUT &&
data->client_want_internal_basetypes)
{
data->allow_internal_basetypes =
check_binary_compatibility(data);
}
if (opt->output_type == OUTPUT_PLUGIN_BINARY_OUTPUT &&
data->client_want_binary_basetypes &&
data->client_binary_basetypes_major_version == PG_VERSION_NUM / 100)
{
data->allow_binary_basetypes = true;
}
/*
* 9.4 lacks origins info so don't forward it.
*
* There's currently no knob for clients to use to suppress
* this info and it's sent if it's supported and available.
*/
if (PG_VERSION_NUM/100 == 904)
data->forward_changeset_origins = false;
else
data->forward_changeset_origins = true;
if (started_tx)
CommitTransactionCommand();
relmetacache_init(ctx->context);
}
/* So we can identify the process type in Valgrind logs */
VALGRIND_PRINTF("SPOCK: spock worker output_plugin\n");
/* For incremental leak checking */
VALGRIND_DISABLE_ERROR_REPORTING;
VALGRIND_DO_LEAK_CHECK;
VALGRIND_ENABLE_ERROR_REPORTING;
}
/*
* BEGIN callback
*/
static void
pg_decode_begin_txn(LogicalDecodingContext *ctx, ReorderBufferTXN *txn)
{
SpockOutputData* data = (SpockOutputData*)ctx->output_plugin_private;
bool send_replication_origin = data->forward_changeset_origins;
MemoryContext old_ctx;
/* Reset repair mode */
spock_replication_repair_mode = false;
/*
* Check if we are a member of a replication slot-group and if so,
* if another member is already working on this transaction. If
* nobody does, then claim this transaction for us and start
* working.
*/
if (slot_group != NULL)
{
LWLockAcquire(slot_group->lock, LW_EXCLUSIVE);
if (slot_group->last_lsn >= txn->end_lsn)
{
slot_group_skip_xact = true;
elog(DEBUG1, "slot-group '%s' skipping transaction with end_lsn %X/%X"
" - last_lsn %X/%X",
NameStr(slot_group->name),
(uint32)(txn->end_lsn >> 32),
(uint32)(txn->end_lsn),
(uint32)(slot_group->last_lsn >> 32),
(uint32)(slot_group->last_lsn));
LWLockRelease(slot_group->lock);
return;
}
elog(DEBUG1, "slot-group '%s' sending transaction with end_lsn %X/%X",
NameStr(slot_group->name),
(uint32)(txn->end_lsn >> 32),
(uint32)(txn->end_lsn));
slot_group->last_lsn = txn->end_lsn;
LWLockRelease(slot_group->lock);
}
old_ctx = MemoryContextSwitchTo(data->context);
VALGRIND_DO_ADDED_LEAK_CHECK;
if (!startup_message_sent)
send_startup_message(ctx, data, false /* can't be last message */);
OutputPluginPrepareWrite(ctx, !send_replication_origin);
data->api->write_begin(ctx->out, data, txn);
#ifdef HAVE_REPLICATION_ORIGINS
if (send_replication_origin)
{
/* Message boundary */
OutputPluginWrite(ctx, false);
OutputPluginPrepareWrite(ctx, true);
/*
* On transactions that originated locally generate the origin
* message with our own and node.id. Remote transactions
* that we forward will have the node.id of what we got from
* the remote, which is the real origin of the transaction.
*/
if (data->api->write_origin)
{
if (txn->origin_id == InvalidRepOriginId)
{
data->api->write_origin(ctx->out, MyOutputNodeId,
txn->origin_lsn);
}
else
{
data->api->write_origin(ctx->out, txn->origin_id,
txn->origin_lsn);
}
}
}
#endif
OutputPluginWrite(ctx, true);
Assert(CurrentMemoryContext == data->context);
MemoryContextSwitchTo(old_ctx);
}
/*
* COMMIT callback
*/
static void
pg_decode_commit_txn(LogicalDecodingContext *ctx, ReorderBufferTXN *txn,
XLogRecPtr commit_lsn)
{
SpockOutputData *data = (SpockOutputData*)ctx->output_plugin_private;
MemoryContext old_ctx;
XLogRecPtr end_lsn = txn->end_lsn - MyWalSenderIdx;
/* Reset repair mode */
spock_replication_repair_mode = false;
/*
* If we are in slot-group skip transaction mode, we simply end
* it here and wait for the next transaction.
*/
if (slot_group_skip_xact)
{
slot_group_skip_xact = false;
return;
}
old_ctx = MemoryContextSwitchTo(data->context);
/*
* If we are configured for synchronous replication we must wait
* for this end_lsn to be confirmed according to the configuration
* of synchronous_standby_names before sending it to the subscriber.
* A failover to the synchronous standby may otherwise forget a
* transaction already sent to a Spock node.
*
* There currently is a problem in SyncRepWaitForLSN() in that it
* expects the wait queue to be sorted by LSN and that there are
* no duplicate LSNs in it. There is no good reason for uniqueness
* in that list, but the corresponding Assert code will TRAP if
* we don't use a unique LSN. We therefore use our WalSndCtl->walsnds
* slot number +1 and subtract that from the end_lsn. This works as
* long as that offset is smaller than the size of the commit record
* itself.
*/
if (MyWalSenderIdx == 0)
{
elog(LOG, "Spock: don't have a walsender idx - "
" not calling SyncRepWaitForLSN()");
}
else if (end_lsn <= commit_lsn)
{
elog(LOG, "Spock: walsender idx too big (%d) - "
" not calling SyncRepWaitForLSN()", MyWalSenderIdx);
}
else
{
HOLD_INTERRUPTS();
SyncRepWaitForLSN(end_lsn, true);
RESUME_INTERRUPTS();
}
/* Save lsn and time in hash for lag_tracker*/
lag_tracker_entry(NameStr(MyReplicationSlot->data.name), commit_lsn,
#if PG_VERSION_NUM >= 150000
txn->xact_time.commit_time
#else
txn->commit_time
#endif
);
/* update progress */
OutputPluginUpdateProgress(ctx, false);
OutputPluginPrepareWrite(ctx, true);
data->api->write_commit(ctx->out, data, txn, commit_lsn);
OutputPluginWrite(ctx, true);
/*
* Now is a good time to get rid of invalidated relation
* metadata entries since nothing will be referencing them
* at the moment.
*/
relmetacache_prune();
Assert(CurrentMemoryContext == data->context);
MemoryContextSwitchTo(old_ctx);
MemoryContextReset(data->context);
VALGRIND_DO_ADDED_LEAK_CHECK;
}
/*
* MESSAGE callback
*/
static void
pg_decode_message(LogicalDecodingContext *ctx,
ReorderBufferTXN *txn, XLogRecPtr message_lsn,
bool transactional, const char *prefix,
Size message_size, const char *message)
{
SpockWalMessage *msg = (SpockWalMessage *)message;
/* Ignore messages that are not meant for Spock */
if (strcmp(prefix, "Spock") != 0)
return;
/* Check that we have at least the message type */
if (message_size < sizeof(SpockWalMessageSimple))
{
elog(WARNING, "Spock custom WAL message: message_size %lu too short",
message_size);
return;
}
switch (msg->mtype)
{
case SPOCK_REPAIR_MODE_ON:
/* Turn decoding off for the remainder of the transaction */
if (message_size != sizeof(SpockWalMessageSimple))
{
elog(WARNING, "Spock custom WAL message: wrong message "
"size %lu for simple message", message_size);
return;
}
spock_replication_repair_mode = true;
break;
case SPOCK_REPAIR_MODE_OFF:
/* Turn decoding back on */
if (message_size != sizeof(SpockWalMessageSimple))
{
elog(WARNING, "Spock custom WAL message: wrong message "
"size %lu for simple message", message_size);
return;
}
spock_replication_repair_mode = false;
break;
default:
elog(WARNING, "Spock custom WAL message: unknown message type %d",
msg->mtype);
return;
}
}
static bool
spock_change_filter(SpockOutputData *data, Relation relation,
ReorderBufferChange *change, Bitmapset **att_list)
{
SpockTableRepInfo *tblinfo;
ListCell *lc;
if (data->replicate_only_table)
{
/*
* Special case - we are catching up just one table.
* TODO: performance
*/
return strcmp(RelationGetRelationName(relation),
data->replicate_only_table->relname) == 0 &&
RelationGetNamespace(relation) ==
get_namespace_oid(data->replicate_only_table->schemaname, true);
}
else if (RelationGetRelid(relation) == get_queue_table_oid())
{
/* Special case - queue table */
if (change->action == REORDER_BUFFER_CHANGE_INSERT)
{
HeapTuple tup = ReorderBufferChangeHeapTuple(change, newtuple);
QueuedMessage *q;
ListCell *qlc;
LockRelation(relation, AccessShareLock);
q = queued_message_from_tuple(tup);
UnlockRelation(relation, AccessShareLock);
/*
* No replication set means global message, those are always
* replicated.
*/
if (q->replication_sets == NULL)
return true;
foreach (qlc, q->replication_sets)
{
char *queue_set = (char *) lfirst(qlc);
ListCell *plc;
foreach (plc, data->replication_sets)
{
SpockRepSet *rs = lfirst(plc);
/* TODO: this is somewhat ugly. */
if (strcmp(queue_set, rs->name) == 0)
return true;
}
}
}
return false;
}
else if (RelationGetRelid(relation) == get_replication_set_rel_oid())
{
/*
* Special case - replication set table.
*
* We can use this to update our cached replication set info, without
* having to deal with cache invalidation callbacks.
*/
HeapTuple tup;
SpockRepSet *replicated_set;
ListCell *plc;
if (change->action == REORDER_BUFFER_CHANGE_UPDATE)
tup = ReorderBufferChangeHeapTuple(change, newtuple);
else if (change->action == REORDER_BUFFER_CHANGE_DELETE)
tup = ReorderBufferChangeHeapTuple(change, oldtuple);
else
return false;
replicated_set = replication_set_from_tuple(tup);
foreach (plc, data->replication_sets)
{
SpockRepSet *rs = lfirst(plc);
/* Check if the changed repset is used by us. */
if (rs->id == replicated_set->id)
{
/*
* In case this was delete, somebody deleted one of our
* rep sets, bail here and let reconnect logic handle any
* potential issues.
*/
if (change->action == REORDER_BUFFER_CHANGE_DELETE)
elog(ERROR, "replication set \"%s\" used by this connection was deleted, existing",
rs->name);
/* This was update of our repset, update the cache. */
rs->replicate_insert = replicated_set->replicate_insert;
rs->replicate_update = replicated_set->replicate_update;
rs->replicate_delete = replicated_set->replicate_delete;
rs->replicate_truncate = replicated_set->replicate_truncate;
return false;
}
}
return false;
}
/* Normal case - use replication set membership. */
tblinfo = get_table_replication_info(data->local_node_id, relation,
data->replication_sets);
/* First try filter out by change type. */
switch (change->action)
{
case REORDER_BUFFER_CHANGE_INSERT:
if (!tblinfo->replicate_insert)
return false;
break;
case REORDER_BUFFER_CHANGE_UPDATE:
if (!tblinfo->replicate_update)
return false;
break;
case REORDER_BUFFER_CHANGE_DELETE:
if (!tblinfo->replicate_delete)
return false;
break;
default:
elog(ERROR, "Unhandled reorder buffer change type %d",
change->action);
return false; /* shut compiler up */
}
/*
* Proccess row filters.
* XXX: we could probably cache some of the executor stuff.
*/
if (list_length(tblinfo->row_filter) > 0)
{
EState *estate;
ExprContext *econtext;
TupleDesc tupdesc = RelationGetDescr(relation);
HeapTuple oldtup = change->data.tp.oldtuple ?
ReorderBufferChangeHeapTuple(change, oldtuple) : NULL;
HeapTuple newtup = change->data.tp.newtuple ?
ReorderBufferChangeHeapTuple(change, newtuple) : NULL;
/* Skip empty changes. */
if (!newtup && !oldtup)
{
elog(DEBUG1, "spock output got empty change");
return false;
}
PushActiveSnapshot(GetTransactionSnapshot());
estate = create_estate_for_relation(relation, false);
econtext = prepare_per_tuple_econtext(estate, tupdesc);
ExecStoreHeapTuple(newtup ? newtup : oldtup, econtext->ecxt_scantuple, false);
/* Next try the row_filters if there are any. */
foreach (lc, tblinfo->row_filter)
{
Node *row_filter = (Node *) lfirst(lc);
ExprState *exprstate = spock_prepare_row_filter(row_filter);
Datum res;
bool isnull;
res = ExecEvalExpr(exprstate, econtext, &isnull, NULL);
/* NULL is same as false for our use. */
if (isnull)
return false;
if (!DatumGetBool(res))
return false;
}
ExecDropSingleTupleTableSlot(econtext->ecxt_scantuple);
FreeExecutorState(estate);
PopActiveSnapshot();
}
/* Make sure caller is aware of any attribute filter. */
*att_list = tblinfo->att_list;
return true;
}
/*
* Send relation description.
*/
static void
maybe_send_schema(LogicalDecodingContext *ctx, ReorderBufferChange *change,
Relation relation)
{
SpockOutputData *data = ctx->output_plugin_private;
SPKRelMetaCacheEntry *cached_relmeta;
/*
* If the protocol wants to write relation information and the client
* isn't known to have metadata cached for this relation already,
* send relation metadata.
*
* TODO: track hit/miss stats
*/
if (data->api->write_rel == NULL)
return;
cached_relmeta = relmetacache_get_relation(data, relation);
if (!cached_relmeta->is_cached)
{
SpockTableRepInfo *tblinfo;
tblinfo = get_table_replication_info(data->local_node_id, relation,
data->replication_sets);
OutputPluginPrepareWrite(ctx, false);
data->api->write_rel(ctx->out, data, relation, tblinfo->att_list);
OutputPluginWrite(ctx, false);
cached_relmeta->is_cached = true;
}
}
static void
pg_decode_change(LogicalDecodingContext *ctx, ReorderBufferTXN *txn,
Relation relation, ReorderBufferChange *change)
{
SpockOutputData *data = ctx->output_plugin_private;
MemoryContext old;
Bitmapset *att_list = NULL;
/*
* If we are in slot-group skip transaction mode do nothing
*/
if (slot_group_skip_xact)
return;
/* If in repair mode skip these actions */
if (spock_replication_repair_mode)
return;
/* Avoid leaking memory by using and resetting our own context */
old = MemoryContextSwitchTo(data->context);
/* update progress */
OutputPluginUpdateProgress(ctx, false);
/* Save lsn and time in hash */
lag_tracker_entry(NameStr(MyReplicationSlot->data.name), ctx->write_location,
#if PG_VERSION_NUM >= 150000
txn->xact_time.commit_time
#else
txn->commit_time
#endif
);
/* First check the table filter */
if (!spock_change_filter(data, relation, change, &att_list))
goto cleanup;
/* Send relation description */
maybe_send_schema(ctx, change, relation);
/* Send the data */
switch (change->action)
{
case REORDER_BUFFER_CHANGE_INSERT:
OutputPluginPrepareWrite(ctx, true);
data->api->write_insert(ctx->out, data, relation,
ReorderBufferChangeHeapTuple(change, newtuple),
att_list);
OutputPluginWrite(ctx, true);
handle_stats_counter(relation, InvalidOid,
SPOCK_STATS_INSERT_COUNT, 1);
break;
case REORDER_BUFFER_CHANGE_UPDATE:
{
HeapTuple oldtuple = change->data.tp.oldtuple ?
ReorderBufferChangeHeapTuple(change, oldtuple) : NULL;
OutputPluginPrepareWrite(ctx, true);
data->api->write_update(ctx->out, data, relation, oldtuple,
ReorderBufferChangeHeapTuple(change, newtuple),
att_list);
OutputPluginWrite(ctx, true);
handle_stats_counter(relation, InvalidOid,
SPOCK_STATS_UPDATE_COUNT, 1);
break;
}
case REORDER_BUFFER_CHANGE_DELETE:
if (change->data.tp.oldtuple)
{
OutputPluginPrepareWrite(ctx, true);
data->api->write_delete(ctx->out, data, relation,
ReorderBufferChangeHeapTuple(change, oldtuple),
att_list);
OutputPluginWrite(ctx, true);
handle_stats_counter(relation, InvalidOid,
SPOCK_STATS_DELETE_COUNT, 1);
}
else
elog(DEBUG1, "didn't send DELETE change because of missing oldtuple");
break;
default:
Assert(false);
}
cleanup:
Assert(CurrentMemoryContext == data->context);
MemoryContextSwitchTo(old);
MemoryContextReset(data->context);
}
static void
pg_decode_truncate(LogicalDecodingContext *ctx, ReorderBufferTXN *txn,
int nrelations, Relation relations[],
ReorderBufferChange *change)
{