1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
|
/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kCommand
#include "mongo/platform/basic.h"
#include "mongo/db/repl/apply_ops.h"
#include "mongo/bson/util/bson_extract.h"
#include "mongo/db/background.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/catalog/database_holder.h"
#include "mongo/db/catalog/document_validation.h"
#include "mongo/db/client.h"
#include "mongo/db/concurrency/lock_state.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/curop.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/index/index_descriptor.h"
#include "mongo/db/index_builds_coordinator.h"
#include "mongo/db/matcher/matcher.h"
#include "mongo/db/op_observer.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/query/collation/collation_spec.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/db/service_context.h"
#include "mongo/db/session_catalog_mongod.h"
#include "mongo/db/transaction_participant.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/util/fail_point_service.h"
#include "mongo/util/log.h"
namespace mongo {
namespace repl {
constexpr StringData ApplyOps::kPreconditionFieldName;
constexpr StringData ApplyOps::kOplogApplicationModeFieldName;
namespace {
// If enabled, causes loop in _applyOps() to hang after applying current operation.
MONGO_FAIL_POINT_DEFINE(applyOpsPauseBetweenOperations);
// If enabled, causes _applyPrepareTransaction to hang before preparing the transaction participant.
MONGO_FAIL_POINT_DEFINE(applyOpsHangBeforePreparingTransaction);
/**
* Return true iff the applyOpsCmd can be executed in a single WriteUnitOfWork.
*/
bool _parseAreOpsCrudOnly(const BSONObj& applyOpCmd) {
for (const auto& elem : applyOpCmd.firstElement().Obj()) {
const char* opType = elem.Obj().getField("op").valuestrsafe();
// All atomic ops have an opType of length 1.
if (opType[0] == '\0' || opType[1] != '\0')
return false;
// Only consider CRUD operations.
switch (*opType) {
case 'd':
case 'n':
case 'u':
break;
case 'i':
break;
// Fallthrough.
default:
return false;
}
}
return true;
}
Status _applyOps(OperationContext* opCtx,
const std::string& dbName,
const BSONObj& applyOpCmd,
const ApplyOpsCommandInfo& info,
repl::OplogApplication::Mode oplogApplicationMode,
BSONObjBuilder* result,
int* numApplied,
BSONArrayBuilder* opsBuilder) {
const auto& ops = info.getOperations();
// apply
*numApplied = 0;
int errors = 0;
BSONArrayBuilder ab;
const auto& alwaysUpsert = info.getAlwaysUpsert();
const bool haveWrappingWUOW = opCtx->lockState()->inAWriteUnitOfWork();
// Apply each op in the given 'applyOps' command object.
for (const auto& opObj : ops) {
// Ignore 'n' operations.
const char* opType = opObj["op"].valuestrsafe();
if (*opType == 'n')
continue;
const NamespaceString nss(opObj["ns"].String());
// Need to check this here, or OldClientContext may fail an invariant.
if (*opType != 'c' && !nss.isValid())
return {ErrorCodes::InvalidNamespace, "invalid ns: " + nss.ns()};
Status status(ErrorCodes::InternalError, "");
if (haveWrappingWUOW) {
// Only CRUD operations are allowed in atomic mode.
invariant(*opType != 'c');
// ApplyOps does not have the global writer lock when applying transaction
// operations, so we need to acquire the DB and Collection locks.
Lock::DBLock dbLock(opCtx, nss.db(), MODE_IX);
auto databaseHolder = DatabaseHolder::get(opCtx);
auto db = databaseHolder->getDb(opCtx, nss.ns());
if (!db) {
// Retry in non-atomic mode, since MMAP cannot implicitly create a new database
// within an active WriteUnitOfWork.
uasserted(ErrorCodes::AtomicityFailure,
"cannot create a database in atomic applyOps mode; will retry without "
"atomicity");
}
// When processing an update on a non-existent collection, applyOperation_inlock()
// returns UpdateOperationFailed on updates and allows the collection to be
// implicitly created on upserts. We detect both cases here and fail early with
// NamespaceNotFound.
// Additionally for inserts, we fail early on non-existent collections.
Lock::CollectionLock collectionLock(opCtx->lockState(), nss.ns(), MODE_IX);
auto collection = db->getCollection(opCtx, nss);
if (!collection && (*opType == 'i' || *opType == 'u')) {
uasserted(
ErrorCodes::AtomicityFailure,
str::stream()
<< "cannot apply insert or update operation on a non-existent namespace "
<< nss.ns()
<< " in atomic applyOps mode: "
<< redact(opObj));
}
// Reject malformed operations in an atomic applyOps.
try {
ReplOperation::parse(IDLParserErrorContext("applyOps"), opObj);
} catch (...) {
uasserted(ErrorCodes::AtomicityFailure,
str::stream()
<< "cannot apply a malformed operation in atomic applyOps mode: "
<< redact(opObj)
<< "; will retry without atomicity: "
<< exceptionToStatus().toString());
}
OldClientContext ctx(opCtx, nss.ns());
status = repl::applyOperation_inlock(
opCtx, ctx.db(), opObj, alwaysUpsert, oplogApplicationMode);
if (!status.isOK())
return status;
// Append completed op, including UUID if available, to 'opsBuilder'.
if (opsBuilder) {
if (opObj.hasField("ui") || !(collection && collection->uuid())) {
// No changes needed to operation document.
opsBuilder->append(opObj);
} else {
// Operation document has no "ui" field and collection has a UUID.
auto uuid = collection->uuid();
BSONObjBuilder opBuilder;
opBuilder.appendElements(opObj);
uuid->appendToBuilder(&opBuilder, "ui");
opsBuilder->append(opBuilder.obj());
}
}
} else {
try {
status = writeConflictRetry(
opCtx,
"applyOps",
nss.ns(),
[opCtx, nss, opObj, opType, alwaysUpsert, oplogApplicationMode] {
BSONObjBuilder builder;
builder.appendElements(opObj);
if (!builder.hasField(OplogEntry::kTimestampFieldName)) {
builder.append(OplogEntry::kTimestampFieldName, Timestamp());
}
if (!builder.hasField(OplogEntry::kHashFieldName)) {
builder.append(OplogEntry::kHashFieldName, 0LL);
}
auto entryObj = builder.done();
auto entry = uassertStatusOK(OplogEntry::parse(entryObj));
if (*opType == 'c') {
invariant(opCtx->lockState()->isW());
uassertStatusOK(applyCommand_inlock(
opCtx, opObj, entry, oplogApplicationMode, boost::none));
return Status::OK();
}
AutoGetCollection autoColl(opCtx, nss, MODE_IX);
if (!autoColl.getCollection()) {
// For idempotency reasons, return success on delete operations.
if (*opType == 'd') {
return Status::OK();
}
uasserted(ErrorCodes::NamespaceNotFound,
str::stream()
<< "cannot apply insert or update operation on a "
"non-existent namespace "
<< nss.ns()
<< ": "
<< mongo::redact(opObj));
}
OldClientContext ctx(opCtx, nss.ns());
// We return the status rather than merely aborting so failure of CRUD
// ops doesn't stop the applyOps from trying to process the rest of the
// ops. This is to leave the door open to parallelizing CRUD op
// application in the future.
return repl::applyOperation_inlock(
opCtx, ctx.db(), opObj, alwaysUpsert, oplogApplicationMode);
});
} catch (const DBException& ex) {
ab.append(false);
result->append("applied", ++(*numApplied));
result->append("code", ex.code());
result->append("codeName", ErrorCodes::errorString(ex.code()));
result->append("errmsg", ex.what());
result->append("results", ab.arr());
return Status(ex.code(), ex.what());
}
}
ab.append(status.isOK());
if (!status.isOK()) {
log() << "applyOps error applying: " << status;
errors++;
}
(*numApplied)++;
if (MONGO_FAIL_POINT(applyOpsPauseBetweenOperations)) {
MONGO_FAIL_POINT_PAUSE_WHILE_SET(applyOpsPauseBetweenOperations);
}
}
result->append("applied", *numApplied);
result->append("results", ab.arr());
if (errors != 0) {
return Status(ErrorCodes::UnknownError, "applyOps had one or more errors applying ops");
}
return Status::OK();
}
Status _applyPrepareTransaction(OperationContext* opCtx,
const repl::OplogEntry& entry,
repl::OplogApplication::Mode oplogApplicationMode) {
const auto info = ApplyOpsCommandInfo::parse(entry.getObject());
invariant(info.getPrepare() && *info.getPrepare());
uassert(
50946,
"applyOps with prepared must only include CRUD operations and cannot have precondition.",
!info.getPreCondition() && info.areOpsCrudOnly());
// Block application of prepare oplog entry on secondaries when a concurrent background index
// build is running.
// This will prevent hybrid index builds from corrupting an index on secondary nodes if a
// prepared transaction becomes prepared during a build but commits after the index build
// commits.
for (const auto& opObj : info.getOperations()) {
auto ns = opObj.getField("ns").checkAndGetStringData();
auto uuid = uassertStatusOK(UUID::parse(opObj.getField("ui")));
BackgroundOperation::awaitNoBgOpInProgForNs(ns);
IndexBuildsCoordinator::get(opCtx)->awaitNoIndexBuildInProgressForCollection(uuid);
}
// Transaction operations are in its own batch, so we can modify their opCtx.
invariant(entry.getSessionId());
invariant(entry.getTxnNumber());
opCtx->setLogicalSessionId(*entry.getSessionId());
opCtx->setTxnNumber(*entry.getTxnNumber());
// The write on transaction table may be applied concurrently, so refreshing state
// from disk may read that write, causing starting a new transaction on an existing
// txnNumber. Thus, we start a new transaction without refreshing state from disk.
MongoDOperationContextSessionWithoutRefresh sessionCheckout(opCtx);
auto transaction = TransactionParticipant::get(opCtx);
transaction.unstashTransactionResources(opCtx, "prepareTransaction");
// Apply the operations via applysOps functionality.
int numApplied = 0;
BSONObjBuilder resultWeDontCareAbout;
auto status = _applyOps(opCtx,
entry.getNss().db().toString(),
entry.getObject(),
info,
oplogApplicationMode,
&resultWeDontCareAbout,
&numApplied,
nullptr);
if (!status.isOK()) {
return status;
}
invariant(!entry.getOpTime().isNull());
if (MONGO_FAIL_POINT(applyOpsHangBeforePreparingTransaction)) {
LOG(0) << "Hit applyOpsHangBeforePreparingTransaction failpoint";
MONGO_FAIL_POINT_PAUSE_WHILE_SET_OR_INTERRUPTED(opCtx,
applyOpsHangBeforePreparingTransaction);
}
transaction.prepareTransaction(opCtx, entry.getOpTime());
transaction.stashTransactionResources(opCtx);
return Status::OK();
}
/**
* Make sure that if we are in replication recovery or initial sync, we don't apply the prepare
* transaction oplog entry until we either see a commit transaction oplog entry or are at the very
* end of recovery/initial sync. Otherwise, only apply the prepare transaction oplog entry if we are
* a secondary.
*/
Status _applyPrepareTransactionOplogEntry(OperationContext* opCtx,
const repl::OplogEntry& entry,
repl::OplogApplication::Mode oplogApplicationMode) {
// Don't apply the operations from the prepared transaction until either we see a commit
// transaction oplog entry during recovery or are at the end of recovery.
if (oplogApplicationMode == OplogApplication::Mode::kRecovering) {
if (!serverGlobalParams.enableMajorityReadConcern) {
error() << "Cannot replay a prepared transaction when 'enableMajorityReadConcern' is "
"set to false. Restart the server with --enableMajorityReadConcern=true "
"to complete recovery.";
}
fassert(50964, serverGlobalParams.enableMajorityReadConcern);
return Status::OK();
}
// Don't apply the operations from the prepared transaction until either we see a commit
// transaction oplog entry during the oplog application phase of initial sync or are at the end
// of initial sync.
if (oplogApplicationMode == OplogApplication::Mode::kInitialSync) {
return Status::OK();
}
// Return error if run via applyOps command.
uassert(50945,
"applyOps with prepared flag is only used internally by secondaries.",
oplogApplicationMode != repl::OplogApplication::Mode::kApplyOpsCmd);
invariant(oplogApplicationMode == repl::OplogApplication::Mode::kSecondary);
return _applyPrepareTransaction(opCtx, entry, oplogApplicationMode);
}
Status _checkPrecondition(OperationContext* opCtx,
const std::vector<BSONObj>& preConditions,
BSONObjBuilder* result) {
invariant(opCtx->lockState()->isW());
for (const auto& preCondition : preConditions) {
if (preCondition["ns"].type() != BSONType::String) {
return {ErrorCodes::InvalidNamespace,
str::stream() << "ns in preCondition must be a string, but found type: "
<< typeName(preCondition["ns"].type())};
}
const NamespaceString nss(preCondition["ns"].valueStringData());
if (!nss.isValid()) {
return {ErrorCodes::InvalidNamespace, "invalid ns: " + nss.ns()};
}
DBDirectClient db(opCtx);
BSONObj realres = db.findOne(nss.ns(), preCondition["q"].Obj());
// Get collection default collation.
auto databaseHolder = DatabaseHolder::get(opCtx);
auto database = databaseHolder->getDb(opCtx, nss.db());
if (!database) {
return {ErrorCodes::NamespaceNotFound, "database in ns does not exist: " + nss.ns()};
}
Collection* collection = database->getCollection(opCtx, nss);
if (!collection) {
return {ErrorCodes::NamespaceNotFound, "collection in ns does not exist: " + nss.ns()};
}
const CollatorInterface* collator = collection->getDefaultCollator();
// applyOps does not allow any extensions, such as $text, $where, $geoNear, $near,
// $nearSphere, or $expr.
boost::intrusive_ptr<ExpressionContext> expCtx(new ExpressionContext(opCtx, collator));
Matcher matcher(preCondition["res"].Obj(), std::move(expCtx));
if (!matcher.matches(realres)) {
result->append("got", realres);
result->append("whatFailed", preCondition);
return {ErrorCodes::BadValue, "preCondition failed"};
}
}
return Status::OK();
}
} // namespace
// static
ApplyOpsCommandInfo ApplyOpsCommandInfo::parse(const BSONObj& applyOpCmd) {
try {
return ApplyOpsCommandInfo(applyOpCmd);
} catch (DBException& ex) {
ex.addContext(str::stream() << "Failed to parse applyOps command: " << redact(applyOpCmd));
throw;
}
}
bool ApplyOpsCommandInfo::areOpsCrudOnly() const {
return _areOpsCrudOnly;
}
bool ApplyOpsCommandInfo::isAtomic() const {
return getAllowAtomic() && areOpsCrudOnly();
}
ApplyOpsCommandInfo::ApplyOpsCommandInfo(const BSONObj& applyOpCmd)
: _areOpsCrudOnly(_parseAreOpsCrudOnly(applyOpCmd)) {
parseProtected(IDLParserErrorContext("applyOps"), applyOpCmd);
if (getPreCondition()) {
uassert(ErrorCodes::InvalidOptions,
"Cannot use preCondition with {allowAtomic: false}",
getAllowAtomic());
uassert(ErrorCodes::InvalidOptions,
"Cannot use preCondition when operations include commands.",
areOpsCrudOnly());
}
}
Status applyApplyOpsOplogEntry(OperationContext* opCtx,
const OplogEntry& entry,
repl::OplogApplication::Mode oplogApplicationMode) {
// Apply prepare transaction operation if "prepare" is true.
// The lock requirement of transaction operations should be the same as that on the primary,
// so we don't acquire the locks conservatively for them.
if (entry.shouldPrepare()) {
return _applyPrepareTransactionOplogEntry(opCtx, entry, oplogApplicationMode);
}
BSONObjBuilder resultWeDontCareAbout;
return applyOps(opCtx,
entry.getNss().db().toString(),
entry.getObject(),
oplogApplicationMode,
&resultWeDontCareAbout);
}
Status applyRecoveredPrepareApplyOpsOplogEntry(OperationContext* opCtx, const OplogEntry& entry) {
// We might replay a prepared transaction behind oldest timestamp.
opCtx->recoveryUnit()->setRoundUpPreparedTimestamps(true);
return _applyPrepareTransaction(opCtx, entry, OplogApplication::Mode::kRecovering);
}
Status applyOps(OperationContext* opCtx,
const std::string& dbName,
const BSONObj& applyOpCmd,
repl::OplogApplication::Mode oplogApplicationMode,
BSONObjBuilder* result) {
auto info = ApplyOpsCommandInfo::parse(applyOpCmd);
int numApplied = 0;
boost::optional<Lock::GlobalWrite> globalWriteLock;
boost::optional<Lock::DBLock> dbWriteLock;
uassert(
ErrorCodes::BadValue, "applyOps command can't have 'prepare' field", !info.getPrepare());
// There's only one case where we are allowed to take the database lock instead of the global
// lock - no preconditions; only CRUD ops; and non-atomic mode.
if (!info.getPreCondition() && info.areOpsCrudOnly() && !info.getAllowAtomic()) {
dbWriteLock.emplace(opCtx, dbName, MODE_IX);
} else {
globalWriteLock.emplace(opCtx);
}
auto replCoord = repl::ReplicationCoordinator::get(opCtx);
bool userInitiatedWritesAndNotPrimary =
opCtx->writesAreReplicated() && !replCoord->canAcceptWritesForDatabase(opCtx, dbName);
if (userInitiatedWritesAndNotPrimary)
return Status(ErrorCodes::NotMaster,
str::stream() << "Not primary while applying ops to database " << dbName);
if (auto preCondition = info.getPreCondition()) {
invariant(info.isAtomic());
auto status = _checkPrecondition(opCtx, *preCondition, result);
if (!status.isOK()) {
return status;
}
}
if (!info.isAtomic()) {
return _applyOps(
opCtx, dbName, applyOpCmd, info, oplogApplicationMode, result, &numApplied, nullptr);
}
// Perform write ops atomically
invariant(globalWriteLock);
try {
writeConflictRetry(opCtx, "applyOps", dbName, [&] {
BSONObjBuilder intermediateResult;
std::unique_ptr<BSONArrayBuilder> opsBuilder;
if (opCtx->writesAreReplicated()) {
opsBuilder = stdx::make_unique<BSONArrayBuilder>();
}
WriteUnitOfWork wunit(opCtx);
numApplied = 0;
{
// Suppress replication for atomic operations until end of applyOps.
repl::UnreplicatedWritesBlock uwb(opCtx);
uassertStatusOK(_applyOps(opCtx,
dbName,
applyOpCmd,
info,
oplogApplicationMode,
&intermediateResult,
&numApplied,
opsBuilder.get()));
}
// Generate oplog entry for all atomic ops collectively.
if (opCtx->writesAreReplicated()) {
// We want this applied atomically on slaves so we rewrite the oplog entry without
// the pre-condition for speed.
BSONObjBuilder cmdBuilder;
auto opsFieldName = applyOpCmd.firstElement().fieldNameStringData();
for (auto elem : applyOpCmd) {
auto name = elem.fieldNameStringData();
if (name == opsFieldName && opsBuilder) {
cmdBuilder.append(opsFieldName, opsBuilder->arr());
continue;
}
if (name == ApplyOps::kPreconditionFieldName)
continue;
if (name == bypassDocumentValidationCommandOption())
continue;
cmdBuilder.append(elem);
}
const BSONObj cmdRewritten = cmdBuilder.done();
auto opObserver = getGlobalServiceContext()->getOpObserver();
invariant(opObserver);
opObserver->onApplyOps(opCtx, dbName, cmdRewritten);
}
wunit.commit();
result->appendElements(intermediateResult.obj());
});
} catch (const DBException& ex) {
if (ex.code() == ErrorCodes::AtomicityFailure) {
// Retry in non-atomic mode.
return _applyOps(opCtx,
dbName,
applyOpCmd,
info,
oplogApplicationMode,
result,
&numApplied,
nullptr);
}
BSONArrayBuilder ab;
++numApplied;
for (int j = 0; j < numApplied; j++)
ab.append(false);
result->append("applied", numApplied);
result->append("code", ex.code());
result->append("codeName", ErrorCodes::errorString(ex.code()));
result->append("errmsg", ex.what());
result->append("results", ab.arr());
return ex.toStatus();
}
return Status::OK();
}
// static
MultiApplier::Operations ApplyOps::extractOperations(const OplogEntry& applyOpsOplogEntry) {
uassert(ErrorCodes::TypeMismatch,
str::stream() << "ApplyOps::extractOperations(): not a command: "
<< redact(applyOpsOplogEntry.toBSON()),
applyOpsOplogEntry.isCommand());
uassert(ErrorCodes::CommandNotSupported,
str::stream() << "ApplyOps::extractOperations(): not applyOps command: "
<< redact(applyOpsOplogEntry.toBSON()),
OplogEntry::CommandType::kApplyOps == applyOpsOplogEntry.getCommandType());
auto cmdObj = applyOpsOplogEntry.getOperationToApply();
auto operationDocs = cmdObj.firstElement().Obj();
if (operationDocs.isEmpty()) {
return {};
}
MultiApplier::Operations operations;
auto topLevelDoc = applyOpsOplogEntry.toBSON();
for (const auto& elem : operationDocs) {
auto operationDoc = elem.Obj();
BSONObjBuilder builder(operationDoc);
builder.appendElementsUnique(topLevelDoc);
auto operation = builder.obj();
operations.emplace_back(operation);
}
return operations;
}
} // namespace repl
} // namespace mongo
|