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service_entry_point_mongod.cpp
1184 lines (1003 loc) · 49.8 KB
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service_entry_point_mongod.cpp
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/**
* Copyright (C) 2017 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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/service_entry_point_mongod.h"
#include "mongo/base/checked_cast.h"
#include "mongo/db/audit.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/impersonation_session.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/commands/fsync.h"
#include "mongo/db/concurrency/global_lock_acquisition_tracker.h"
#include "mongo/db/curop.h"
#include "mongo/db/curop_metrics.h"
#include "mongo/db/cursor_manager.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/initialize_operation_session_info.h"
#include "mongo/db/introspect.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/lasterror.h"
#include "mongo/db/logical_clock.h"
#include "mongo/db/logical_session_id.h"
#include "mongo/db/logical_session_id_helpers.h"
#include "mongo/db/logical_time_validator.h"
#include "mongo/db/ops/write_ops.h"
#include "mongo/db/ops/write_ops_exec.h"
#include "mongo/db/query/find.h"
#include "mongo/db/read_concern.h"
#include "mongo/db/repl/optime.h"
#include "mongo/db/repl/read_concern_args.h"
#include "mongo/db/repl/repl_client_info.h"
#include "mongo/db/repl/replication_coordinator_global.h"
#include "mongo/db/s/operation_sharding_state.h"
#include "mongo/db/s/sharded_connection_info.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/db/session_catalog.h"
#include "mongo/db/stats/counters.h"
#include "mongo/db/stats/top.h"
#include "mongo/rpc/factory.h"
#include "mongo/rpc/metadata.h"
#include "mongo/rpc/metadata/config_server_metadata.h"
#include "mongo/rpc/metadata/logical_time_metadata.h"
#include "mongo/rpc/metadata/oplog_query_metadata.h"
#include "mongo/rpc/metadata/repl_set_metadata.h"
#include "mongo/rpc/metadata/sharding_metadata.h"
#include "mongo/rpc/metadata/tracking_metadata.h"
#include "mongo/rpc/reply_builder_interface.h"
#include "mongo/s/grid.h"
#include "mongo/s/stale_exception.h"
#include "mongo/util/fail_point_service.h"
#include "mongo/util/log.h"
#include "mongo/util/net/message.h"
#include "mongo/util/net/op_msg.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
MONGO_FP_DECLARE(rsStopGetMore);
MONGO_FP_DECLARE(respondWithNotPrimaryInCommandDispatch);
namespace {
using logger::LogComponent;
// The command names for which to check out a session.
//
// Note: Eval should check out a session because it defaults to running under a global write lock,
// so if it didn't, and the function it was given contains any of these whitelisted commands, they
// would try to check out a session under a lock, which is not allowed. Similarly,
// refreshLogicalSessionCacheNow triggers a bulk update under a lock on the sessions collection.
const StringMap<int> cmdWhitelist = {{"delete", 1},
{"eval", 1},
{"$eval", 1},
{"findandmodify", 1},
{"findAndModify", 1},
{"insert", 1},
{"refreshLogicalSessionCacheNow", 1},
{"update", 1}};
void generateLegacyQueryErrorResponse(const AssertionException* exception,
const QueryMessage& queryMessage,
CurOp* curop,
Message* response) {
curop->debug().exceptionInfo = exception->toStatus();
log(LogComponent::kQuery) << "assertion " << exception->toString() << " ns:" << queryMessage.ns
<< " query:" << (queryMessage.query.valid(BSONVersion::kLatest)
? queryMessage.query.toString()
: "query object is corrupt");
if (queryMessage.ntoskip || queryMessage.ntoreturn) {
log(LogComponent::kQuery) << " ntoskip:" << queryMessage.ntoskip
<< " ntoreturn:" << queryMessage.ntoreturn;
}
auto scex = exception->extraInfo<StaleConfigInfo>();
BSONObjBuilder err;
err.append("$err", exception->reason());
err.append("code", exception->code());
if (scex) {
err.append("ok", 0.0);
err.append("ns", scex->getns());
scex->getVersionReceived().addToBSON(err, "vReceived");
scex->getVersionWanted().addToBSON(err, "vWanted");
}
BSONObj errObj = err.done();
if (scex) {
log(LogComponent::kQuery) << "stale version detected during query over " << queryMessage.ns
<< " : " << errObj;
}
BufBuilder bb;
bb.skip(sizeof(QueryResult::Value));
bb.appendBuf((void*)errObj.objdata(), errObj.objsize());
// TODO: call replyToQuery() from here instead of this!!! see dbmessage.h
QueryResult::View msgdata = bb.buf();
QueryResult::View qr = msgdata;
qr.setResultFlags(ResultFlag_ErrSet);
if (scex)
qr.setResultFlags(qr.getResultFlags() | ResultFlag_ShardConfigStale);
qr.msgdata().setLen(bb.len());
qr.msgdata().setOperation(opReply);
qr.setCursorId(0);
qr.setStartingFrom(0);
qr.setNReturned(1);
response->setData(bb.release());
}
void registerError(OperationContext* opCtx, const DBException& exception) {
LastError::get(opCtx->getClient()).setLastError(exception.code(), exception.reason());
CurOp::get(opCtx)->debug().exceptionInfo = exception.toStatus();
}
void _generateErrorResponse(OperationContext* opCtx,
rpc::ReplyBuilderInterface* replyBuilder,
const DBException& exception,
const BSONObj& replyMetadata) {
registerError(opCtx, exception);
// We could have thrown an exception after setting fields in the builder,
// so we need to reset it to a clean state just to be sure.
replyBuilder->reset();
replyBuilder->setCommandReply(exception.toStatus());
replyBuilder->setMetadata(replyMetadata);
}
void _generateErrorResponse(OperationContext* opCtx,
rpc::ReplyBuilderInterface* replyBuilder,
const DBException& exception,
const BSONObj& replyMetadata,
LogicalTime operationTime) {
registerError(opCtx, exception);
// We could have thrown an exception after setting fields in the builder,
// so we need to reset it to a clean state just to be sure.
replyBuilder->reset();
replyBuilder->setCommandReply(exception.toStatus(),
BSON("operationTime" << operationTime.asTimestamp()));
replyBuilder->setMetadata(replyMetadata);
}
/**
* Guard object for making a good-faith effort to enter maintenance mode and leave it when it
* goes out of scope.
*
* Sometimes we cannot set maintenance mode, in which case the call to setMaintenanceMode will
* return a non-OK status. This class does not treat that case as an error which means that
* anybody using it is assuming it is ok to continue execution without maintenance mode.
*
* TODO: This assumption needs to be audited and documented, or this behavior should be moved
* elsewhere.
*/
class MaintenanceModeSetter {
MONGO_DISALLOW_COPYING(MaintenanceModeSetter);
public:
MaintenanceModeSetter(OperationContext* opCtx)
: _opCtx(opCtx),
_maintenanceModeSet(
repl::ReplicationCoordinator::get(_opCtx)->setMaintenanceMode(true).isOK()) {}
~MaintenanceModeSetter() {
if (_maintenanceModeSet) {
repl::ReplicationCoordinator::get(_opCtx)
->setMaintenanceMode(false)
.transitional_ignore();
}
}
private:
OperationContext* const _opCtx;
const bool _maintenanceModeSet;
};
// Called from the error contexts where request may not be available.
// It only attaches clusterTime and operationTime.
void appendReplyMetadataOnError(OperationContext* opCtx, BSONObjBuilder* metadataBob) {
auto const replCoord = repl::ReplicationCoordinator::get(opCtx);
const bool isReplSet =
replCoord->getReplicationMode() == repl::ReplicationCoordinator::modeReplSet;
if (isReplSet) {
if (LogicalTimeValidator::isAuthorizedToAdvanceClock(opCtx)) {
// No need to sign cluster times for internal clients.
SignedLogicalTime currentTime(
LogicalClock::get(opCtx)->getClusterTime(), TimeProofService::TimeProof(), 0);
rpc::LogicalTimeMetadata logicalTimeMetadata(currentTime);
logicalTimeMetadata.writeToMetadata(metadataBob);
} else if (auto validator = LogicalTimeValidator::get(opCtx)) {
auto currentTime =
validator->trySignLogicalTime(LogicalClock::get(opCtx)->getClusterTime());
rpc::LogicalTimeMetadata logicalTimeMetadata(currentTime);
logicalTimeMetadata.writeToMetadata(metadataBob);
}
}
}
void appendReplyMetadata(OperationContext* opCtx,
const OpMsgRequest& request,
BSONObjBuilder* metadataBob) {
const bool isShardingAware = ShardingState::get(opCtx)->enabled();
const bool isConfig = serverGlobalParams.clusterRole == ClusterRole::ConfigServer;
auto const replCoord = repl::ReplicationCoordinator::get(opCtx);
const bool isReplSet =
replCoord->getReplicationMode() == repl::ReplicationCoordinator::modeReplSet;
if (isReplSet) {
// Attach our own last opTime.
repl::OpTime lastOpTimeFromClient =
repl::ReplClientInfo::forClient(opCtx->getClient()).getLastOp();
replCoord->prepareReplMetadata(opCtx, request.body, lastOpTimeFromClient, metadataBob);
// For commands from mongos, append some info to help getLastError(w) work.
// TODO: refactor out of here as part of SERVER-18236
if (isShardingAware || isConfig) {
rpc::ShardingMetadata(lastOpTimeFromClient, replCoord->getElectionId())
.writeToMetadata(metadataBob)
.transitional_ignore();
}
if (LogicalTimeValidator::isAuthorizedToAdvanceClock(opCtx)) {
// No need to sign cluster times for internal clients.
SignedLogicalTime currentTime(
LogicalClock::get(opCtx)->getClusterTime(), TimeProofService::TimeProof(), 0);
rpc::LogicalTimeMetadata logicalTimeMetadata(currentTime);
logicalTimeMetadata.writeToMetadata(metadataBob);
} else if (auto validator = LogicalTimeValidator::get(opCtx)) {
auto currentTime =
validator->trySignLogicalTime(LogicalClock::get(opCtx)->getClusterTime());
rpc::LogicalTimeMetadata logicalTimeMetadata(currentTime);
logicalTimeMetadata.writeToMetadata(metadataBob);
}
}
// If we're a shard other than the config shard, attach the last configOpTime we know about.
if (isShardingAware && !isConfig) {
auto opTime = grid.configOpTime();
rpc::ConfigServerMetadata(opTime).writeToMetadata(metadataBob);
}
}
/**
* Given the specified command, returns an effective read concern which should be used or an error
* if the read concern is not valid for the command.
*/
StatusWith<repl::ReadConcernArgs> _extractReadConcern(const Command* command,
const std::string& dbName,
const BSONObj& cmdObj) {
repl::ReadConcernArgs readConcernArgs;
auto readConcernParseStatus = readConcernArgs.initialize(cmdObj);
if (!readConcernParseStatus.isOK()) {
return readConcernParseStatus;
}
if (!command->supportsReadConcern(dbName, cmdObj, readConcernArgs.getLevel())) {
return {ErrorCodes::InvalidOptions,
str::stream() << "Command does not support read concern "
<< readConcernArgs.toString()};
}
return readConcernArgs;
}
void _waitForWriteConcernAndAddToCommandResponse(OperationContext* opCtx,
const std::string& commandName,
const repl::OpTime& lastOpBeforeRun,
BSONObjBuilder* commandResponseBuilder) {
auto lastOpAfterRun = repl::ReplClientInfo::forClient(opCtx->getClient()).getLastOp();
// Ensures that if we tried to do a write, we wait for write concern, even if that write was
// a noop.
if ((lastOpAfterRun == lastOpBeforeRun) &&
GlobalLockAcquisitionTracker::get(opCtx).getGlobalExclusiveLockTaken()) {
repl::ReplClientInfo::forClient(opCtx->getClient()).setLastOpToSystemLastOpTime(opCtx);
lastOpAfterRun = repl::ReplClientInfo::forClient(opCtx->getClient()).getLastOp();
}
WriteConcernResult res;
auto waitForWCStatus =
waitForWriteConcern(opCtx, lastOpAfterRun, opCtx->getWriteConcern(), &res);
CommandHelpers::appendCommandWCStatus(*commandResponseBuilder, waitForWCStatus, res);
// SERVER-22421: This code is to ensure error response backwards compatibility with the
// user management commands. This can be removed in 3.6.
if (!waitForWCStatus.isOK() && CommandHelpers::isUserManagementCommand(commandName)) {
BSONObj temp = commandResponseBuilder->asTempObj().copy();
commandResponseBuilder->resetToEmpty();
CommandHelpers::appendCommandStatus(*commandResponseBuilder, waitForWCStatus);
commandResponseBuilder->appendElementsUnique(temp);
}
}
/**
* For replica set members it returns the last known op time from opCtx. Otherwise will return
* uninitialized cluster time.
*/
LogicalTime getClientOperationTime(OperationContext* opCtx) {
auto const replCoord = repl::ReplicationCoordinator::get(opCtx);
const bool isReplSet =
replCoord->getReplicationMode() == repl::ReplicationCoordinator::modeReplSet;
LogicalTime operationTime;
if (isReplSet) {
operationTime = LogicalTime(
repl::ReplClientInfo::forClient(opCtx->getClient()).getLastOp().getTimestamp());
}
return operationTime;
}
/**
* Returns the proper operationTime for a command. To construct the operationTime for replica set
* members, it uses the last optime in the oplog for writes, last committed optime for majority
* reads, and the last applied optime for every other read. An uninitialized cluster time is
* returned for non replica set members.
*/
LogicalTime computeOperationTime(OperationContext* opCtx,
LogicalTime startOperationTime,
repl::ReadConcernLevel level) {
auto const replCoord = repl::ReplicationCoordinator::get(opCtx);
const bool isReplSet =
replCoord->getReplicationMode() == repl::ReplicationCoordinator::modeReplSet;
if (!isReplSet) {
return LogicalTime();
}
auto operationTime = getClientOperationTime(opCtx);
invariant(operationTime >= startOperationTime);
// If the last operationTime has not changed, consider this command a read, and, for replica set
// members, construct the operationTime with the proper optime for its read concern level.
if (operationTime == startOperationTime) {
if (level == repl::ReadConcernLevel::kMajorityReadConcern) {
operationTime = LogicalTime(replCoord->getLastCommittedOpTime().getTimestamp());
} else {
operationTime = LogicalTime(replCoord->getMyLastAppliedOpTime().getTimestamp());
}
}
return operationTime;
}
bool runCommandImpl(OperationContext* opCtx,
Command* command,
const OpMsgRequest& request,
rpc::ReplyBuilderInterface* replyBuilder,
LogicalTime startOperationTime) {
auto bytesToReserve = command->reserveBytesForReply();
// SERVER-22100: In Windows DEBUG builds, the CRT heap debugging overhead, in conjunction with the
// additional memory pressure introduced by reply buffer pre-allocation, causes the concurrency
// suite to run extremely slowly. As a workaround we do not pre-allocate in Windows DEBUG builds.
#ifdef _WIN32
if (kDebugBuild)
bytesToReserve = 0;
#endif
// run expects non-const bsonobj
BSONObj cmd = request.body;
// run expects const db std::string (can't bind to temporary)
const std::string db = request.getDatabase().toString();
BSONObjBuilder inPlaceReplyBob = replyBuilder->getInPlaceReplyBuilder(bytesToReserve);
Status rcStatus = waitForReadConcern(
opCtx, repl::ReadConcernArgs::get(opCtx), command->allowsAfterClusterTime(cmd));
if (!rcStatus.isOK()) {
if (rcStatus == ErrorCodes::ExceededTimeLimit) {
const int debugLevel =
serverGlobalParams.clusterRole == ClusterRole::ConfigServer ? 0 : 2;
LOG(debugLevel) << "Command on database " << db
<< " timed out waiting for read concern to be satisfied. Command: "
<< redact(command->getRedactedCopyForLogging(request.body));
}
auto result = CommandHelpers::appendCommandStatus(inPlaceReplyBob, rcStatus);
inPlaceReplyBob.doneFast();
BSONObjBuilder metadataBob;
appendReplyMetadataOnError(opCtx, &metadataBob);
replyBuilder->setMetadata(metadataBob.done());
return result;
}
bool result;
if (!command->supportsWriteConcern(cmd)) {
if (commandSpecifiesWriteConcern(cmd)) {
auto result = CommandHelpers::appendCommandStatus(
inPlaceReplyBob,
{ErrorCodes::InvalidOptions, "Command does not support writeConcern"});
inPlaceReplyBob.doneFast();
BSONObjBuilder metadataBob;
appendReplyMetadataOnError(opCtx, &metadataBob);
replyBuilder->setMetadata(metadataBob.done());
return result;
}
result = command->publicRun(opCtx, request, inPlaceReplyBob);
} else {
auto wcResult = extractWriteConcern(opCtx, cmd, db);
if (!wcResult.isOK()) {
auto result =
CommandHelpers::appendCommandStatus(inPlaceReplyBob, wcResult.getStatus());
inPlaceReplyBob.doneFast();
BSONObjBuilder metadataBob;
appendReplyMetadataOnError(opCtx, &metadataBob);
replyBuilder->setMetadata(metadataBob.done());
return result;
}
auto lastOpBeforeRun = repl::ReplClientInfo::forClient(opCtx->getClient()).getLastOp();
// Change the write concern while running the command.
const auto oldWC = opCtx->getWriteConcern();
ON_BLOCK_EXIT([&] { opCtx->setWriteConcern(oldWC); });
opCtx->setWriteConcern(wcResult.getValue());
ON_BLOCK_EXIT([&] {
_waitForWriteConcernAndAddToCommandResponse(
opCtx, command->getName(), lastOpBeforeRun, &inPlaceReplyBob);
});
result = command->publicRun(opCtx, request, inPlaceReplyBob);
// Nothing in run() should change the writeConcern.
dassert(SimpleBSONObjComparator::kInstance.evaluate(opCtx->getWriteConcern().toBSON() ==
wcResult.getValue().toBSON()));
}
// When a linearizable read command is passed in, check to make sure we're reading
// from the primary.
if (repl::ReadConcernArgs::get(opCtx).getLevel() ==
repl::ReadConcernLevel::kLinearizableReadConcern) {
auto linearizableReadStatus = waitForLinearizableReadConcern(opCtx);
if (!linearizableReadStatus.isOK()) {
inPlaceReplyBob.resetToEmpty();
auto result =
CommandHelpers::appendCommandStatus(inPlaceReplyBob, linearizableReadStatus);
inPlaceReplyBob.doneFast();
BSONObjBuilder metadataBob;
appendReplyMetadataOnError(opCtx, &metadataBob);
replyBuilder->setMetadata(metadataBob.done());
return result;
}
}
CommandHelpers::appendCommandStatus(inPlaceReplyBob, result);
auto operationTime = computeOperationTime(
opCtx, startOperationTime, repl::ReadConcernArgs::get(opCtx).getLevel());
// An uninitialized operation time means the cluster time is not propagated, so the operation
// time should not be attached to the response.
if (operationTime != LogicalTime::kUninitialized) {
operationTime.appendAsOperationTime(&inPlaceReplyBob);
}
inPlaceReplyBob.doneFast();
BSONObjBuilder metadataBob;
appendReplyMetadata(opCtx, request, &metadataBob);
replyBuilder->setMetadata(metadataBob.done());
return result;
}
// When active, we won't check if we are master in command dispatch. Activate this if you want to
// test failing during command execution.
MONGO_FP_DECLARE(skipCheckingForNotMasterInCommandDispatch);
/**
* Executes a command after stripping metadata, performing authorization checks,
* handling audit impersonation, and (potentially) setting maintenance mode. This method
* also checks that the command is permissible to run on the node given its current
* replication state. All the logic here is independent of any particular command; any
* functionality relevant to a specific command should be confined to its run() method.
*/
void execCommandDatabase(OperationContext* opCtx,
Command* command,
const OpMsgRequest& request,
rpc::ReplyBuilderInterface* replyBuilder) {
auto startOperationTime = getClientOperationTime(opCtx);
try {
{
stdx::lock_guard<Client> lk(*opCtx->getClient());
CurOp::get(opCtx)->setCommand_inlock(command);
}
// TODO: move this back to runCommands when mongos supports OperationContext
// see SERVER-18515 for details.
rpc::readRequestMetadata(opCtx, request.body);
rpc::TrackingMetadata::get(opCtx).initWithOperName(command->getName());
auto const replCoord = repl::ReplicationCoordinator::get(opCtx);
initializeOperationSessionInfo(
opCtx,
request.body,
command->requiresAuth(),
replCoord->getReplicationMode() == repl::ReplicationCoordinator::modeReplSet,
opCtx->getServiceContext()->getGlobalStorageEngine()->supportsDocLocking());
const auto dbname = request.getDatabase().toString();
uassert(
ErrorCodes::InvalidNamespace,
str::stream() << "Invalid database name: '" << dbname << "'",
NamespaceString::validDBName(dbname, NamespaceString::DollarInDbNameBehavior::Allow));
std::unique_ptr<MaintenanceModeSetter> mmSetter;
BSONElement cmdOptionMaxTimeMSField;
BSONElement allowImplicitCollectionCreationField;
BSONElement helpField;
BSONElement shardVersionFieldIdx;
BSONElement queryOptionMaxTimeMSField;
StringMap<int> topLevelFields;
for (auto&& element : request.body) {
StringData fieldName = element.fieldNameStringData();
if (fieldName == QueryRequest::cmdOptionMaxTimeMS) {
cmdOptionMaxTimeMSField = element;
} else if (fieldName == "allowImplicitCollectionCreation") {
allowImplicitCollectionCreationField = element;
} else if (fieldName == CommandHelpers::kHelpFieldName) {
helpField = element;
} else if (fieldName == ChunkVersion::kShardVersionField) {
shardVersionFieldIdx = element;
} else if (fieldName == QueryRequest::queryOptionMaxTimeMS) {
queryOptionMaxTimeMSField = element;
}
uassert(ErrorCodes::FailedToParse,
str::stream() << "Parsed command object contains duplicate top level key: "
<< fieldName,
topLevelFields[fieldName]++ == 0);
}
if (CommandHelpers::isHelpRequest(helpField)) {
CurOp::get(opCtx)->ensureStarted();
// We disable last-error for help requests due to SERVER-11492, because config servers
// use help requests to determine which commands are database writes, and so must be
// forwarded to all config servers.
LastError::get(opCtx->getClient()).disable();
Command::generateHelpResponse(opCtx, replyBuilder, *command);
return;
}
// Session ids are forwarded in requests, so commands that require roundtrips between
// servers may result in a deadlock when a server tries to check out a session it is already
// using to service an earlier operation in the command's chain. To avoid this, only check
// out sessions for commands that require them (i.e. write commands).
OperationContextSession sessionTxnState(
opCtx, cmdWhitelist.find(command->getName()) != cmdWhitelist.cend());
ImpersonationSessionGuard guard(opCtx);
uassertStatusOK(Command::checkAuthorization(command, opCtx, request));
const bool iAmPrimary = replCoord->canAcceptWritesForDatabase_UNSAFE(opCtx, dbname);
if (!opCtx->getClient()->isInDirectClient() &&
!MONGO_FAIL_POINT(skipCheckingForNotMasterInCommandDispatch)) {
bool commandCanRunOnSecondary = command->slaveOk();
bool commandIsOverriddenToRunOnSecondary =
command->slaveOverrideOk() && ReadPreferenceSetting::get(opCtx).canRunOnSecondary();
bool iAmStandalone = !opCtx->writesAreReplicated();
bool canRunHere = iAmPrimary || commandCanRunOnSecondary ||
commandIsOverriddenToRunOnSecondary || iAmStandalone;
// This logic is clearer if we don't have to invert it.
if (!canRunHere && command->slaveOverrideOk()) {
uasserted(ErrorCodes::NotMasterNoSlaveOk, "not master and slaveOk=false");
}
if (MONGO_FAIL_POINT(respondWithNotPrimaryInCommandDispatch)) {
uassert(ErrorCodes::NotMaster, "not primary", canRunHere);
} else {
uassert(ErrorCodes::NotMaster, "not master", canRunHere);
}
if (!command->maintenanceOk() &&
replCoord->getReplicationMode() == repl::ReplicationCoordinator::modeReplSet &&
!replCoord->canAcceptWritesForDatabase_UNSAFE(opCtx, dbname) &&
!replCoord->getMemberState().secondary()) {
uassert(ErrorCodes::NotMasterOrSecondary,
"node is recovering",
!replCoord->getMemberState().recovering());
uassert(ErrorCodes::NotMasterOrSecondary,
"node is not in primary or recovering state",
replCoord->getMemberState().primary());
// Check ticket SERVER-21432, slaveOk commands are allowed in drain mode
uassert(ErrorCodes::NotMasterOrSecondary,
"node is in drain mode",
commandIsOverriddenToRunOnSecondary || commandCanRunOnSecondary);
}
}
if (command->adminOnly()) {
LOG(2) << "command: " << request.getCommandName();
}
if (command->maintenanceMode()) {
mmSetter.reset(new MaintenanceModeSetter(opCtx));
}
if (command->shouldAffectCommandCounter()) {
OpCounters* opCounters = &globalOpCounters;
opCounters->gotCommand();
}
// Handle command option maxTimeMS.
int maxTimeMS = uassertStatusOK(QueryRequest::parseMaxTimeMS(cmdOptionMaxTimeMSField));
uassert(ErrorCodes::InvalidOptions,
"no such command option $maxTimeMs; use maxTimeMS instead",
queryOptionMaxTimeMSField.eoo());
if (maxTimeMS > 0) {
uassert(40119,
"Illegal attempt to set operation deadline within DBDirectClient",
!opCtx->getClient()->isInDirectClient());
opCtx->setDeadlineAfterNowBy(Milliseconds{maxTimeMS});
}
auto& readConcernArgs = repl::ReadConcernArgs::get(opCtx);
readConcernArgs = uassertStatusOK(_extractReadConcern(command, dbname, request.body));
auto& oss = OperationShardingState::get(opCtx);
if (!opCtx->getClient()->isInDirectClient() &&
readConcernArgs.getLevel() != repl::ReadConcernLevel::kAvailableReadConcern &&
(iAmPrimary ||
(readConcernArgs.hasLevel() || readConcernArgs.getArgsAfterClusterTime()))) {
oss.initializeShardVersion(NamespaceString(command->parseNs(dbname, request.body)),
shardVersionFieldIdx);
auto const shardingState = ShardingState::get(opCtx);
if (oss.hasShardVersion()) {
uassertStatusOK(shardingState->canAcceptShardedCommands());
}
// Handle config optime information that may have been sent along with the command.
uassertStatusOK(shardingState->updateConfigServerOpTimeFromMetadata(opCtx));
}
oss.setAllowImplicitCollectionCreation(allowImplicitCollectionCreationField);
// Can throw
opCtx->checkForInterrupt(); // May trigger maxTimeAlwaysTimeOut fail point.
bool retval = false;
CurOp::get(opCtx)->ensureStarted();
command->incrementCommandsExecuted();
if (logger::globalLogDomain()->shouldLog(logger::LogComponent::kTracking,
logger::LogSeverity::Debug(1)) &&
rpc::TrackingMetadata::get(opCtx).getParentOperId()) {
MONGO_LOG_COMPONENT(1, logger::LogComponent::kTracking)
<< rpc::TrackingMetadata::get(opCtx).toString();
rpc::TrackingMetadata::get(opCtx).setIsLogged(true);
}
retval = runCommandImpl(opCtx, command, request, replyBuilder, startOperationTime);
if (!retval) {
command->incrementCommandsFailed();
}
} catch (const DBException& e) {
// If we got a stale config, wait in case the operation is stuck in a critical section
if (auto sce = e.extraInfo<StaleConfigInfo>()) {
if (!opCtx->getClient()->isInDirectClient()) {
ShardingState::get(opCtx)
->onStaleShardVersion(
opCtx, NamespaceString(sce->getns()), sce->getVersionReceived())
.transitional_ignore();
}
}
BSONObjBuilder metadataBob;
appendReplyMetadata(opCtx, request, &metadataBob);
// Note: the read concern may not have been successfully or yet placed on the opCtx, so
// parsing it separately here.
const std::string db = request.getDatabase().toString();
auto readConcernArgsStatus = _extractReadConcern(command, db, request.body);
auto operationTime = readConcernArgsStatus.isOK()
? computeOperationTime(
opCtx, startOperationTime, readConcernArgsStatus.getValue().getLevel())
: LogicalClock::get(opCtx)->getClusterTime();
// An uninitialized operation time means the cluster time is not propagated, so the
// operation time should not be attached to the error response.
if (operationTime != LogicalTime::kUninitialized) {
LOG(1) << "assertion while executing command '" << request.getCommandName() << "' "
<< "on database '" << request.getDatabase() << "' "
<< "with arguments '" << command->getRedactedCopyForLogging(request.body)
<< "' and operationTime '" << operationTime.toString() << "': " << e.toString();
_generateErrorResponse(opCtx, replyBuilder, e, metadataBob.obj(), operationTime);
} else {
LOG(1) << "assertion while executing command '" << request.getCommandName() << "' "
<< "on database '" << request.getDatabase() << "' "
<< "with arguments '" << command->getRedactedCopyForLogging(request.body)
<< "': " << e.toString();
_generateErrorResponse(opCtx, replyBuilder, e, metadataBob.obj());
}
}
}
/**
* Fills out CurOp / OpDebug with basic command info.
*/
void curOpCommandSetup(OperationContext* opCtx, const OpMsgRequest& request) {
auto curop = CurOp::get(opCtx);
curop->debug().iscommand = true;
// We construct a legacy $cmd namespace so we can fill in curOp using
// the existing logic that existed for OP_QUERY commands
NamespaceString nss(request.getDatabase(), "$cmd");
stdx::lock_guard<Client> lk(*opCtx->getClient());
curop->setOpDescription_inlock(request.body);
curop->markCommand_inlock();
curop->setNS_inlock(nss.ns());
}
DbResponse runCommands(OperationContext* opCtx, const Message& message) {
auto replyBuilder = rpc::makeReplyBuilder(rpc::protocolForMessage(message));
[&] {
OpMsgRequest request;
try { // Parse.
request = rpc::opMsgRequestFromAnyProtocol(message);
} catch (const DBException& ex) {
// If this error needs to fail the connection, propagate it out.
if (ErrorCodes::isConnectionFatalMessageParseError(ex.code()))
throw;
auto operationTime = LogicalClock::get(opCtx)->getClusterTime();
BSONObjBuilder metadataBob;
appendReplyMetadataOnError(opCtx, &metadataBob);
// Otherwise, reply with the parse error. This is useful for cases where parsing fails
// due to user-supplied input, such as the document too deep error. Since we failed
// during parsing, we can't log anything about the command.
LOG(1) << "assertion while parsing command: " << ex.toString();
_generateErrorResponse(opCtx, replyBuilder.get(), ex, metadataBob.obj(), operationTime);
return; // From lambda. Don't try executing if parsing failed.
}
try { // Execute.
curOpCommandSetup(opCtx, request);
Command* c = nullptr;
// In the absence of a Command object, no redaction is possible. Therefore
// to avoid displaying potentially sensitive information in the logs,
// we restrict the log message to the name of the unrecognized command.
// However, the complete command object will still be echoed to the client.
if (!(c = CommandHelpers::findCommand(request.getCommandName()))) {
globalCommandRegistry()->incrementUnknownCommands();
std::string msg = str::stream() << "no such command: '" << request.getCommandName()
<< "'";
LOG(2) << msg;
uasserted(ErrorCodes::CommandNotFound,
str::stream() << msg << ", bad cmd: '" << redact(request.body) << "'");
}
LOG(2) << "run command " << request.getDatabase() << ".$cmd" << ' '
<< c->getRedactedCopyForLogging(request.body);
{
// Try to set this as early as possible, as soon as we have figured out the command.
stdx::lock_guard<Client> lk(*opCtx->getClient());
CurOp::get(opCtx)->setLogicalOp_inlock(c->getLogicalOp());
}
execCommandDatabase(opCtx, c, request, replyBuilder.get());
} catch (const DBException& ex) {
BSONObjBuilder metadataBob;
appendReplyMetadataOnError(opCtx, &metadataBob);
auto operationTime = LogicalClock::get(opCtx)->getClusterTime();
LOG(1) << "assertion while executing command '" << request.getCommandName() << "' "
<< "on database '" << request.getDatabase() << "': " << ex.toString();
_generateErrorResponse(opCtx, replyBuilder.get(), ex, metadataBob.obj(), operationTime);
}
}();
if (OpMsg::isFlagSet(message, OpMsg::kMoreToCome)) {
// Close the connection to get client to go through server selection again.
uassert(ErrorCodes::NotMaster,
"Not-master error during fire-and-forget command processing",
!LastError::get(opCtx->getClient()).hadNotMasterError());
return {}; // Don't reply.
}
auto response = replyBuilder->done();
CurOp::get(opCtx)->debug().responseLength = response.header().dataLen();
// TODO exhaust
return DbResponse{std::move(response)};
}
DbResponse receivedQuery(OperationContext* opCtx,
const NamespaceString& nss,
Client& c,
const Message& m) {
invariant(!nss.isCommand());
globalOpCounters.gotQuery();
DbMessage d(m);
QueryMessage q(d);
CurOp& op = *CurOp::get(opCtx);
DbResponse dbResponse;
try {
Client* client = opCtx->getClient();
Status status = AuthorizationSession::get(client)->checkAuthForFind(nss, false);
audit::logQueryAuthzCheck(client, nss, q.query, status.code());
uassertStatusOK(status);
dbResponse.exhaustNS = runQuery(opCtx, q, nss, dbResponse.response);
} catch (const AssertionException& e) {
// If we got a stale config, wait in case the operation is stuck in a critical section
if (auto sce = e.extraInfo<StaleConfigInfo>()) {
if (!opCtx->getClient()->isInDirectClient()) {
ShardingState::get(opCtx)
->onStaleShardVersion(
opCtx, NamespaceString(sce->getns()), sce->getVersionReceived())
.transitional_ignore();
}
}
dbResponse.response.reset();
generateLegacyQueryErrorResponse(&e, q, &op, &dbResponse.response);
}
op.debug().responseLength = dbResponse.response.header().dataLen();
return dbResponse;
}
void receivedKillCursors(OperationContext* opCtx, const Message& m) {
LastError::get(opCtx->getClient()).disable();
DbMessage dbmessage(m);
int n = dbmessage.pullInt();
uassert(13659, "sent 0 cursors to kill", n != 0);
massert(13658,
str::stream() << "bad kill cursors size: " << m.dataSize(),
m.dataSize() == 8 + (8 * n));
uassert(13004, str::stream() << "sent negative cursors to kill: " << n, n >= 1);
if (n > 2000) {
(n < 30000 ? warning() : error()) << "receivedKillCursors, n=" << n;
verify(n < 30000);
}
const char* cursorArray = dbmessage.getArray(n);
int found = CursorManager::killCursorGlobalIfAuthorized(opCtx, n, cursorArray);
if (shouldLog(logger::LogSeverity::Debug(1)) || found != n) {
LOG(found == n ? 1 : 0) << "killcursors: found " << found << " of " << n;
}
}
void receivedInsert(OperationContext* opCtx, const NamespaceString& nsString, const Message& m) {
auto insertOp = InsertOp::parseLegacy(m);
invariant(insertOp.getNamespace() == nsString);
for (const auto& obj : insertOp.getDocuments()) {
Status status =
AuthorizationSession::get(opCtx->getClient())->checkAuthForInsert(opCtx, nsString, obj);
audit::logInsertAuthzCheck(opCtx->getClient(), nsString, obj, status.code());
uassertStatusOK(status);
}
performInserts(opCtx, insertOp);
}
void receivedUpdate(OperationContext* opCtx, const NamespaceString& nsString, const Message& m) {
auto updateOp = UpdateOp::parseLegacy(m);
auto& singleUpdate = updateOp.getUpdates()[0];
invariant(updateOp.getNamespace() == nsString);
Status status = AuthorizationSession::get(opCtx->getClient())
->checkAuthForUpdate(opCtx,
nsString,
singleUpdate.getQ(),
singleUpdate.getU(),
singleUpdate.getUpsert());
audit::logUpdateAuthzCheck(opCtx->getClient(),
nsString,
singleUpdate.getQ(),
singleUpdate.getU(),
singleUpdate.getUpsert(),
singleUpdate.getMulti(),
status.code());
uassertStatusOK(status);
performUpdates(opCtx, updateOp);
}
void receivedDelete(OperationContext* opCtx, const NamespaceString& nsString, const Message& m) {
auto deleteOp = DeleteOp::parseLegacy(m);
auto& singleDelete = deleteOp.getDeletes()[0];
invariant(deleteOp.getNamespace() == nsString);
Status status = AuthorizationSession::get(opCtx->getClient())
->checkAuthForDelete(opCtx, nsString, singleDelete.getQ());
audit::logDeleteAuthzCheck(opCtx->getClient(), nsString, singleDelete.getQ(), status.code());
uassertStatusOK(status);
performDeletes(opCtx, deleteOp);
}
DbResponse receivedGetMore(OperationContext* opCtx,
const Message& m,
CurOp& curop,
bool* shouldLogOpDebug) {
globalOpCounters.gotGetMore();
DbMessage d(m);
const char* ns = d.getns();
int ntoreturn = d.pullInt();
uassert(
34419, str::stream() << "Invalid ntoreturn for OP_GET_MORE: " << ntoreturn, ntoreturn >= 0);
long long cursorid = d.pullInt64();
curop.debug().ntoreturn = ntoreturn;
curop.debug().cursorid = cursorid;
{
stdx::lock_guard<Client> lk(*opCtx->getClient());
CurOp::get(opCtx)->setNS_inlock(ns);
}
bool exhaust = false;
bool isCursorAuthorized = false;
DbResponse dbresponse;
try {
const NamespaceString nsString(ns);
uassert(ErrorCodes::InvalidNamespace,