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spock_apply.c
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spock_apply.c
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/*-------------------------------------------------------------------------
*
* spock_apply.c
* spock apply logic
*
* Copyright (c) 2022-2023, 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 "miscadmin.h"
#include "libpq-fe.h"
#include "pgstat.h"
#include "access/htup_details.h"
#include "access/xact.h"
#include "catalog/namespace.h"
#include "commands/async.h"
#include "commands/dbcommands.h"
#include "commands/sequence.h"
#include "commands/tablecmds.h"
#include "commands/trigger.h"
#include "executor/executor.h"
#include "libpq/pqformat.h"
#include "mb/pg_wchar.h"
#include "nodes/makefuncs.h"
#include "nodes/parsenodes.h"
#include "optimizer/planner.h"
#ifdef XCP
#include "pgxc/pgxcnode.h"
#endif
#include "postmaster/interrupt.h"
#include "replication/origin.h"
#include "replication/reorderbuffer.h"
#include "replication/walsender.h"
#include "rewrite/rewriteHandler.h"
#include "storage/ipc.h"
#include "storage/lmgr.h"
#include "storage/proc.h"
#include "tcop/pquery.h"
#include "tcop/utility.h"
#include "utils/builtins.h"
#if PG_VERSION_NUM < 150000
#include "utils/int8.h"
#else
#include "utils/builtins.h"
#endif
#include "utils/jsonb.h"
#include "utils/lsyscache.h"
#include "utils/memutils.h"
#include "utils/snapmgr.h"
#if PG_VERSION_NUM >= 160000
#include "utils/usercontext.h"
#endif
#include "spock_conflict.h"
#include "spock_executor.h"
#include "spock_node.h"
#include "spock_queue.h"
#include "spock_relcache.h"
#include "spock_repset.h"
#include "spock_rpc.h"
#include "spock_sync.h"
#include "spock_worker.h"
#include "spock_apply.h"
#include "spock_apply_heap.h"
#include "spock_apply_spi.h"
#include "spock.h"
PGDLLEXPORT void spock_apply_main(Datum main_arg);
static bool in_remote_transaction = false;
static XLogRecPtr remote_origin_lsn = InvalidXLogRecPtr;
static RepOriginId remote_origin_id = InvalidRepOriginId;
static TimeOffset apply_delay = 0;
static Oid QueueRelid = InvalidOid;
static List *SyncingTables = NIL;
SpockApplyWorker *MyApplyWorker = NULL;
SpockSubscription *MySubscription = NULL;
static PGconn *applyconn = NULL;
typedef struct SpockApplyFunctions
{
spock_apply_begin_fn on_begin;
spock_apply_commit_fn on_commit;
spock_apply_insert_fn do_insert;
spock_apply_update_fn do_update;
spock_apply_delete_fn do_delete;
spock_apply_can_mi_fn can_multi_insert;
spock_apply_mi_add_tuple_fn multi_insert_add_tuple;
spock_apply_mi_finish_fn multi_insert_finish;
} SpockApplyFunctions;
static SpockApplyFunctions apply_api =
{
.on_begin = spock_apply_heap_begin,
.on_commit = spock_apply_heap_commit,
.do_insert = spock_apply_heap_insert,
.do_update = spock_apply_heap_update,
.do_delete = spock_apply_heap_delete,
.can_multi_insert = spock_apply_heap_can_mi,
.multi_insert_add_tuple = spock_apply_heap_mi_add_tuple,
.multi_insert_finish = spock_apply_heap_mi_finish
};
/* Number of tuples inserted after which we switch to multi-insert. */
#define MIN_MULTI_INSERT_TUPLES 5
static SpockRelation *last_insert_rel = NULL;
static int last_insert_rel_cnt = 0;
static bool use_multi_insert = false;
/*
* A message counter for the xact, for debugging. We don't send
* the remote change LSN with messages, so this aids identification
* of which change causes an error.
*/
static uint32 xact_action_counter;
typedef struct SPKFlushPosition
{
dlist_node node;
XLogRecPtr local_end;
XLogRecPtr remote_end;
} SPKFlushPosition;
dlist_head lsn_mapping = DLIST_STATIC_INIT(lsn_mapping);
typedef struct ApplyExecState
{
EState *estate;
EPQState epqstate;
ResultRelInfo *resultRelInfo;
TupleTableSlot *slot;
} ApplyExecState;
struct ActionErrCallbackArg
{
const char * action_name;
SpockRelation *rel;
bool is_ddl_or_drop;
};
struct ActionErrCallbackArg errcallback_arg;
TransactionId remote_xid;
static void multi_insert_finish(void);
static void handle_queued_message(HeapTuple msgtup, bool tx_just_started);
static void handle_startup_param(const char *key, const char *value);
static bool parse_bool_param(const char *key, const char *value);
static void process_syncing_tables(XLogRecPtr end_lsn);
static void start_sync_worker(Name nspname, Name relname);
/*
* Check if given relation is in process of being synchronized.
*
* TODO: performance
*/
static bool
should_apply_changes_for_rel(const char *nspname, const char *relname)
{
if (list_length(SyncingTables) > 0)
{
ListCell *lc;
foreach (lc, SyncingTables)
{
SpockSyncStatus *sync = (SpockSyncStatus *) lfirst(lc);
if (namestrcmp(&sync->nspname, nspname) == 0 &&
namestrcmp(&sync->relname, relname) == 0 &&
(sync->status != SYNC_STATUS_READY &&
!(sync->status == SYNC_STATUS_SYNCDONE &&
sync->statuslsn <= replorigin_session_origin_lsn)))
return false;
}
}
return true;
}
/*
* Prepare apply state details for errcontext or direct logging.
*
* This callback could be invoked at all sorts of weird times
* so it should assume as little as psosible about the invoking
* context.
*/
static void
format_action_description(
StringInfo si,
const char * action_name,
SpockRelation *rel,
bool is_ddl_or_drop)
{
appendStringInfoString(si, "apply ");
appendStringInfoString(si,
action_name == NULL ? "(unknown action)" : action_name);
if (rel != NULL &&
rel->nspname != NULL
&& rel->relname != NULL
&& !is_ddl_or_drop)
{
appendStringInfo(si, " from remote relation %s.%s",
rel->nspname, rel->relname);
}
appendStringInfo(si,
" in commit before %X/%X, xid %u committed at %s (action #%u)",
(uint32)(replorigin_session_origin_lsn>>32),
(uint32)replorigin_session_origin_lsn,
remote_xid,
timestamptz_to_str(replorigin_session_origin_timestamp),
xact_action_counter);
if (replorigin_session_origin != InvalidRepOriginId)
{
appendStringInfo(si, " from node replorigin %u",
replorigin_session_origin);
}
if (remote_origin_id != InvalidRepOriginId)
{
appendStringInfo(si, " forwarded from commit %X/%X on node %u",
(uint32)(remote_origin_lsn>>32),
(uint32)remote_origin_lsn,
remote_origin_id);
}
}
static void
action_error_callback(void *arg)
{
StringInfoData si;
initStringInfo(&si);
format_action_description(&si,
errcallback_arg.action_name,
errcallback_arg.rel,
errcallback_arg.is_ddl_or_drop);
errcontext("%s", si.data);
pfree(si.data);
}
static bool
ensure_transaction(void)
{
if (IsTransactionState())
{
if (CurrentMemoryContext != MessageContext)
MemoryContextSwitchTo(MessageContext);
return false;
}
/*
* spock doesn't have "statements" as such, so we'll report one
* statement per applied transaction. We must set the statement start time
* because StartTransaction() uses it to initialize the transaction cached
* timestamp used by current_timestamp. If we don't set it, every xact will
* get the same current_timestamp. See 2ndQuadrant/spock_internal#148
*/
SetCurrentStatementStartTimestamp();
StartTransactionCommand();
apply_api.on_begin();
MemoryContextSwitchTo(MessageContext);
return true;
}
static void
handle_begin(StringInfo s)
{
XLogRecPtr commit_lsn;
TimestampTz commit_time;
xact_action_counter = 1;
errcallback_arg.action_name = "BEGIN";
spock_read_begin(s, &commit_lsn, &commit_time, &remote_xid);
replorigin_session_origin_timestamp = commit_time;
replorigin_session_origin_lsn = commit_lsn;
remote_origin_id = InvalidRepOriginId;
VALGRIND_PRINTF("SPOCK_APPLY: begin %u\n", remote_xid);
/* don't want the overhead otherwise */
if (apply_delay > 0)
{
TimestampTz current;
current = GetCurrentIntegerTimestamp();
/* ensure no weirdness due to clock drift */
if (current > replorigin_session_origin_timestamp)
{
long sec;
int usec;
current = TimestampTzPlusMilliseconds(current,
-apply_delay);
TimestampDifference(current, replorigin_session_origin_timestamp,
&sec, &usec);
/* FIXME: deal with overflow? */
pg_usleep(usec + (sec * USECS_PER_SEC));
}
}
in_remote_transaction = true;
pgstat_report_activity(STATE_RUNNING, NULL);
}
/*
* Handle COMMIT message.
*/
static void
handle_commit(StringInfo s)
{
XLogRecPtr commit_lsn;
XLogRecPtr end_lsn;
TimestampTz commit_time;
errcallback_arg.action_name = "COMMIT";
xact_action_counter++;
spock_read_commit(s, &commit_lsn, &end_lsn, &commit_time);
Assert(commit_time == replorigin_session_origin_timestamp);
if (IsTransactionState())
{
SPKFlushPosition *flushpos;
multi_insert_finish();
apply_api.on_commit();
/* We need to write end_lsn to the commit record. */
replorigin_session_origin_lsn = end_lsn;
CommitTransactionCommand();
MemoryContextSwitchTo(TopMemoryContext);
/* Track commit lsn */
flushpos = (SPKFlushPosition *) palloc(sizeof(SPKFlushPosition));
flushpos->local_end = XactLastCommitEnd;
flushpos->remote_end = end_lsn;
dlist_push_tail(&lsn_mapping, &flushpos->node);
MemoryContextSwitchTo(MessageContext);
}
/*
* If the xact isn't from the immediate upstream, advance the slot of the
* node it originally came from so we start replay of that node's change
* data at the right place.
*
* This is only necessary when we're streaming data from one peer (A) that
* in turn receives from other peers (B, C), and we plan to later switch to
* replaying directly from B and/or C, no longer receiving forwarded xacts
* from A. When we do the switchover we need to know the right place at
* which to start replay from B and C. We don't actually do that yet, but
* we'll want to be able to do cascaded initialisation in future, so it's
* worth keeping track.
*
* A failure can occur here (see #79) if there's a cascading
* replication configuration like:
*
* X--> Y -> Z
* | ^
* | |
* \---------/
*
* where the direct and indirect connections from X to Z use different
* replication sets so as not to conflict, and where Y and Z are on the
* same PostgreSQL instance. In this case our attempt to advance the
* replication identifier here will ERROR because it's already in use
* for the direct connection from X to Z. So don't do that.
*/
if (remote_origin_id != InvalidRepOriginId &&
remote_origin_id != replorigin_session_origin)
{
Relation replorigin_rel;
elog(DEBUG3, "SPOCK %s: advancing origin oid %u for forwarded "
"row to %X/%X",
MySubscription->name,
remote_origin_id,
(uint32)(XactLastCommitEnd>>32), (uint32)XactLastCommitEnd);
replorigin_rel = table_open(ReplicationOriginRelationId, RowExclusiveLock);
replorigin_advance(remote_origin_id, remote_origin_lsn,
XactLastCommitEnd, false, false /* XXX ? */);
table_close(replorigin_rel, RowExclusiveLock);
}
in_remote_transaction = false;
/*
* Stop replay if we're doing limited replay and we've replayed up to the
* last record we're supposed to process.
*/
if (MyApplyWorker->replay_stop_lsn != InvalidXLogRecPtr
&& MyApplyWorker->replay_stop_lsn <= end_lsn)
{
ereport(LOG,
(errmsg("SPOCK %s: %s finished processing; replayed "
"to %X/%X of required %X/%X",
MySubscription->name,
MySpockWorker->worker_type == SPOCK_WORKER_SYNC ? "sync" : "apply",
(uint32)(end_lsn>>32), (uint32)end_lsn,
(uint32)(MyApplyWorker->replay_stop_lsn >>32),
(uint32)MyApplyWorker->replay_stop_lsn)));
/*
* If this is sync worker, update syncing table state to done.
*/
if (MySpockWorker->worker_type == SPOCK_WORKER_SYNC)
{
StartTransactionCommand();
set_table_sync_status(MyApplyWorker->subid,
NameStr(MySpockWorker->worker.sync.nspname),
NameStr(MySpockWorker->worker.sync.relname),
SYNC_STATUS_SYNCDONE, end_lsn);
CommitTransactionCommand();
}
/*
* Flush all writes so the latest position can be reported back to the
* sender.
*/
XLogFlush(GetXLogWriteRecPtr());
/*
* Disconnect.
*
* This needs to happen before the spock_sync_worker_finish()
* call otherwise slot drop will fail.
*/
PQfinish(applyconn);
/*
* If this is sync worker, finish it.
*/
if (MySpockWorker->worker_type == SPOCK_WORKER_SYNC)
spock_sync_worker_finish();
/* Stop gracefully */
proc_exit(0);
}
VALGRIND_PRINTF("SPOCK_APPLY: commit %u\n", remote_xid);
xact_action_counter = 0;
remote_xid = InvalidTransactionId;
process_syncing_tables(end_lsn);
/*
* Ensure any pending signals/self-notifies are sent out.
*
* Note that there is a possibility that this will result in an ERROR,
* which will result in the apply worker being killed and restarted. As
* the notification queues have already been flushed, the same error won't
* occur again, however if errors continue, they will dramatically slow
* down - but not stop - replication.
*
* For PG15 and above, such notifications are sent at transaction commit.
* (This is also true of previous version branches that received a fix[1]
* but where ProcessCompletedNotifies() was converted to a no-op routine
* to avoid breaking ABI.)
*
* [1] -- Discussion: https://www.postgresql.org/message-id/flat/[email protected]
*/
#if PG_VERSION_NUM < 150000
ProcessCompletedNotifies();
#endif
pgstat_report_activity(STATE_IDLE, NULL);
}
/*
* Handle ORIGIN message.
*/
static void
handle_origin(StringInfo s)
{
char *origin;
/*
* ORIGIN message can only come inside remote transaction and before
* any actual writes.
*/
if (!in_remote_transaction || IsTransactionState())
elog(ERROR, "SPOCK %s: ORIGIN message sent out of order",
MySubscription->name);
/* We have to start transaction here so that we can work with origins. */
ensure_transaction();
origin = spock_read_origin(s, &remote_origin_lsn);
remote_origin_id = replorigin_by_name(origin, true);
}
/*
* Handle RELATION message.
*
* Note we don't do validation against local schema here. The validation is
* posponed until first change for given relation comes.
*/
static void
handle_relation(StringInfo s)
{
multi_insert_finish();
(void) spock_read_rel(s);
}
static void
handle_insert(StringInfo s)
{
SpockTupleData newtup;
SpockRelation *rel;
#if PG_VERSION_NUM >= 160000
UserContext ucxt;
#endif
bool started_tx = ensure_transaction();
PushActiveSnapshot(GetTransactionSnapshot());
errcallback_arg.action_name = "INSERT";
xact_action_counter++;
rel = spock_read_insert(s, RowExclusiveLock, &newtup);
errcallback_arg.rel = rel;
/* If in list of relations which are being synchronized, skip. */
if (!should_apply_changes_for_rel(rel->nspname, rel->relname))
{
spock_relation_close(rel, NoLock);
PopActiveSnapshot();
CommandCounterIncrement();
return;
}
/* Make sure that any user-supplied code runs as the table owner. */
SwitchToUntrustedUser(rel->rel->rd_rel->relowner, &ucxt);
/* Handle multi_insert capabilities. */
if (use_multi_insert)
{
if (rel != last_insert_rel)
{
multi_insert_finish();
/* Fall through to normal insert. */
}
else
{
apply_api.multi_insert_add_tuple(rel, &newtup);
last_insert_rel_cnt++;
return;
}
}
else if (spock_batch_inserts &&
RelationGetRelid(rel->rel) != QueueRelid &&
apply_api.can_multi_insert &&
apply_api.can_multi_insert(rel))
{
if (rel != last_insert_rel)
{
last_insert_rel = rel;
last_insert_rel_cnt = 0;
}
else if (last_insert_rel_cnt++ >= MIN_MULTI_INSERT_TUPLES)
{
use_multi_insert = true;
last_insert_rel_cnt = 0;
}
}
/* Normal insert. */
apply_api.do_insert(rel, &newtup);
/* if INSERT was into our queue, process the message. */
if (RelationGetRelid(rel->rel) == QueueRelid)
{
HeapTuple ht;
LockRelId lockid = rel->rel->rd_lockInfo.lockRelId;
Relation qrel;
multi_insert_finish();
MemoryContextSwitchTo(MessageContext);
ht = heap_form_tuple(RelationGetDescr(rel->rel),
newtup.values, newtup.nulls);
LockRelationIdForSession(&lockid, RowExclusiveLock);
RestoreUserContext(&ucxt);
spock_relation_close(rel, NoLock);
PopActiveSnapshot();
CommandCounterIncrement();
apply_api.on_commit();
handle_queued_message(ht, started_tx);
heap_freetuple(ht);
qrel = table_open(QueueRelid, RowExclusiveLock);
UnlockRelationIdForSession(&lockid, RowExclusiveLock);
table_close(qrel, NoLock);
apply_api.on_begin();
MemoryContextSwitchTo(MessageContext);
// if (oldxid != GetTopTransactionId())
// CommitTransactionCommand();
}
else
{
RestoreUserContext(&ucxt);
spock_relation_close(rel, NoLock);
PopActiveSnapshot();
CommandCounterIncrement();
}
}
static void
multi_insert_finish(void)
{
if (use_multi_insert && last_insert_rel_cnt)
{
const char *old_action = errcallback_arg.action_name;
SpockRelation *old_rel = errcallback_arg.rel;
errcallback_arg.action_name = "multi INSERT";
errcallback_arg.rel = last_insert_rel;
apply_api.multi_insert_finish(last_insert_rel);
spock_relation_close(last_insert_rel, NoLock);
use_multi_insert = false;
last_insert_rel = NULL;
last_insert_rel_cnt = 0;
errcallback_arg.rel = old_rel;
errcallback_arg.action_name = old_action;
}
}
static void
handle_update(StringInfo s)
{
SpockTupleData oldtup;
SpockTupleData newtup;
SpockRelation *rel;
#if PG_VERSION_NUM >= 160000
UserContext ucxt;
#endif
bool hasoldtup;
errcallback_arg.action_name = "UPDATE";
xact_action_counter++;
ensure_transaction();
multi_insert_finish();
PushActiveSnapshot(GetTransactionSnapshot());
rel = spock_read_update(s, RowExclusiveLock, &hasoldtup, &oldtup,
&newtup);
errcallback_arg.rel = rel;
/* If in list of relations which are being synchronized, skip. */
if (!should_apply_changes_for_rel(rel->nspname, rel->relname))
{
spock_relation_close(rel, NoLock);
PopActiveSnapshot();
CommandCounterIncrement();
return;
}
/* Make sure that any user-supplied code runs as the table owner. */
SwitchToUntrustedUser(rel->rel->rd_rel->relowner, &ucxt);
apply_api.do_update(rel, hasoldtup ? &oldtup : &newtup, &newtup);
RestoreUserContext(&ucxt);
spock_relation_close(rel, NoLock);
PopActiveSnapshot();
CommandCounterIncrement();
}
static void
handle_delete(StringInfo s)
{
SpockTupleData oldtup;
SpockRelation *rel;
#if PG_VERSION_NUM >= 160000
UserContext ucxt;
#endif
memset(&errcallback_arg, 0, sizeof(struct ActionErrCallbackArg));
xact_action_counter++;
ensure_transaction();
multi_insert_finish();
PushActiveSnapshot(GetTransactionSnapshot());
rel = spock_read_delete(s, RowExclusiveLock, &oldtup);
errcallback_arg.rel = rel;
/* If in list of relations which are being synchronized, skip. */
if (!should_apply_changes_for_rel(rel->nspname, rel->relname))
{
spock_relation_close(rel, NoLock);
PopActiveSnapshot();
CommandCounterIncrement();
return;
}
/* Make sure that any user-supplied code runs as the table owner. */
SwitchToUntrustedUser(rel->rel->rd_rel->relowner, &ucxt);
apply_api.do_delete(rel, &oldtup);
RestoreUserContext(&ucxt);
spock_relation_close(rel, NoLock);
PopActiveSnapshot();
CommandCounterIncrement();
}
inline static bool
getmsgisend(StringInfo msg)
{
return msg->cursor == msg->len;
}
static void
handle_startup(StringInfo s)
{
uint8 msgver = pq_getmsgbyte(s);
if (msgver != 1)
elog(ERROR, "SPOCK %s: Expected startup message version 1, but got %u",
MySubscription->name, msgver);
/*
* The startup message consists of null-terminated strings as key/value
* pairs. The first entry is always the format identifier.
*/
do {
const char *k, *v;
k = pq_getmsgstring(s);
if (strlen(k) == 0)
ereport(ERROR,
(errcode(ERRCODE_PROTOCOL_VIOLATION),
errmsg("SPOCK %s: invalid startup message: key has "
"zero length",
MySubscription->name)));
if (getmsgisend(s))
ereport(ERROR,
(errcode(ERRCODE_PROTOCOL_VIOLATION),
errmsg("SPOCK %s: invalid startup message: key '%s' "
"has no following value",
MySubscription->name, k)));
/* It's OK to have a zero length value */
v = pq_getmsgstring(s);
handle_startup_param(k, v);
} while (!getmsgisend(s));
}
static bool
parse_bool_param(const char *key, const char *value)
{
bool result;
if (!parse_bool(value, &result))
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("SPOCK %s: couldn't parse value '%s' for key '%s' "
"as boolean",
MySubscription->name, value, key)));
return result;
}
static void
handle_startup_param(const char *key, const char *value)
{
elog(DEBUG2, "SPOCK %s: apply got spock startup msg param %s=%s",
MySubscription->name, key, value);
if (strcmp(key, "pg_version") == 0)
elog(DEBUG1, "SPOCK %s: upstream Pg version is %s",
MySubscription->name, value);
if (strcmp(key, "encoding") == 0)
{
int encoding = pg_char_to_encoding(value);
if (encoding != GetDatabaseEncoding())
ereport(ERROR,
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
errmsg("SPOCK %s: expected encoding=%s from upstream "
"but got %s",
MySubscription->name,
GetDatabaseEncodingName(), value)));
}
if (strcmp(key, "forward_changeset_origins") == 0)
{
bool fwd = parse_bool_param(key, value);
/* FIXME: Store this somewhere */
elog(DEBUG1, "SPOCK %s: changeset origin forwarding enabled: %s",
MySubscription->name, fwd ? "t" : "f");
}
/*
* We just ignore a bunch of parameters here because we specify what we
* require when we send our params to the upstream. It's required to ERROR
* if it can't match what we asked for. It may send the startup message
* first, but it'll be followed by an ERROR if it does. There's no need
* to check params we can't do anything about mismatches of, like protocol
* versions and type sizes.
*/
}
static RangeVar *
parse_relation_message(Jsonb *message)
{
JsonbIterator *it;
JsonbValue v;
int r;
int level = 0;
char *key = NULL;
char **parse_res = NULL;
char *nspname = NULL;
char *relname = NULL;
/* Parse and validate the json message. */
if (!JB_ROOT_IS_OBJECT(message))
elog(ERROR, "SPOCK %s: malformed message in queued message tuple: "
"root is not object",
MySubscription->name);
it = JsonbIteratorInit(&message->root);
while ((r = JsonbIteratorNext(&it, &v, false)) != WJB_DONE)
{
if (level == 0 && r != WJB_BEGIN_OBJECT)
elog(ERROR, "SPOCK %s: root element needs to be an object",
MySubscription->name);
else if (level == 0 && r == WJB_BEGIN_OBJECT)
{
level++;
}
else if (level == 1 && r == WJB_KEY)
{
if (strncmp(v.val.string.val, "schema_name", v.val.string.len) == 0)
parse_res = &nspname;
else if (strncmp(v.val.string.val, "table_name", v.val.string.len) == 0)
parse_res = &relname;
else
elog(ERROR, "SPOCK %s: unexpected key: %s",
MySubscription->name,
pnstrdup(v.val.string.val, v.val.string.len));
key = v.val.string.val;
}
else if (level == 1 && r == WJB_VALUE)
{
if (!key)
elog(ERROR, "SPOCK %s: in wrong state when parsing key",
MySubscription->name);
if (v.type != jbvString)
elog(ERROR, "SPOCK %s: unexpected type for key '%s': %u",
MySubscription->name, key, v.type);
*parse_res = pnstrdup(v.val.string.val, v.val.string.len);
}
else if (level == 1 && r != WJB_END_OBJECT)
{
elog(ERROR, "SPOCK %s: unexpected content: %u at level %d",
MySubscription->name, r, level);
}
else if (r == WJB_END_OBJECT)
{
level--;
parse_res = NULL;
key = NULL;
}
else
elog(ERROR, "SPOCK %s: unexpected content: %u at level %d",
MySubscription->name, r, level);
}
/* Check if we got both schema and table names. */
if (!nspname)
elog(ERROR, "SPOCK %s: missing schema_name in relation message",
MySubscription->name);
if (!relname)
elog(ERROR, "SPOCK %s: missing table_name in relation message",
MySubscription->name);
return makeRangeVar(nspname, relname, -1);
}
/*
* Handle TRUNCATE message comming via queue table.
*/
static void
handle_truncate(QueuedMessage *queued_message)
{
RangeVar *rv;
/*
* If table doesn't exist locally, it can't be subscribed.
*
* TODO: should we error here?
*/
rv = parse_relation_message(queued_message->message);
/* If in list of relations which are being synchronized, skip. */
if (!should_apply_changes_for_rel(rv->schemaname, rv->relname))
return;
truncate_table(rv->schemaname, rv->relname);
}
/*
* Handle TABLESYNC message comming via queue table.
*/
static void
handle_table_sync(QueuedMessage *queued_message)
{
RangeVar *rv;
MemoryContext oldcontext;
SpockSyncStatus *oldsync;
SpockSyncStatus *newsync;
rv = parse_relation_message(queued_message->message);
oldsync = get_table_sync_status(MyApplyWorker->subid, rv->schemaname,
rv->relname, true);
if (oldsync)
{
elog(INFO, "SPOCK %s: table sync came from queue for table %s.%s "
"which already being synchronized, skipping",
MySubscription->name,
rv->schemaname, rv->relname);
return;
}
/* Keep the lists persistent. */
oldcontext = MemoryContextSwitchTo(TopMemoryContext);
newsync = palloc0(sizeof(SpockSyncStatus));
MemoryContextSwitchTo(oldcontext);