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/**
* 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/introspect.h"
#include "mongo/bson/util/builder.h"
#include "mongo/db/auth/authorization_manager.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/client.h"
#include "mongo/db/concurrency/exception_util.h"
#include "mongo/db/curop.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/stats/resource_consumption_metrics.h"
#include "mongo/logv2/log.h"
#include "mongo/rpc/metadata/client_metadata.h"
#include "mongo/util/scopeguard.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kDefault
namespace mongo {
using std::endl;
using std::string;
using std::unique_ptr;
void profile(OperationContext* opCtx, NetworkOp op) {
// Initialize with 1kb at start in order to avoid realloc later
BufBuilder profileBufBuilder(1024);
BSONObjBuilder b(profileBufBuilder);
{
Locker::LockerInfo lockerInfo;
opCtx->lockState()->getLockerInfo(&lockerInfo, CurOp::get(opCtx)->getLockStatsBase());
CurOp::get(opCtx)->debug().append(
opCtx, lockerInfo.stats, opCtx->lockState()->getFlowControlStats(), b);
}
auto& metricsCollector = ResourceConsumption::MetricsCollector::get(opCtx);
if (metricsCollector.hasCollectedMetrics()) {
BSONObjBuilder metricsBuilder = b.subobjStart("operationMetrics");
const auto& metrics = metricsCollector.getMetrics();
metrics.toBson(&metricsBuilder);
metricsBuilder.done();
}
b.appendDate("ts", jsTime());
b.append("client", opCtx->getClient()->clientAddress());
if (auto clientMetadata = ClientMetadata::get(opCtx->getClient())) {
auto appName = clientMetadata->getApplicationName();
if (!appName.empty()) {
b.append("appName", appName);
}
}
AuthorizationSession* authSession = AuthorizationSession::get(opCtx->getClient());
OpDebug::appendUserInfo(*CurOp::get(opCtx), b, authSession);
const BSONObj p = b.done();
const string dbName(nsToDatabase(CurOp::get(opCtx)->getNS()));
auto origFlowControl = opCtx->shouldParticipateInFlowControl();
// The system.profile collection is non-replicated, so writes to it do not cause
// replication lag. As such, they should be excluded from Flow Control.
opCtx->setShouldParticipateInFlowControl(false);
// Set the opCtx to be only interruptible for replication state changes. This is needed
// because for some operations that are already marked as killed due to errors such as
// operation time exceeding maxTimeMS, we still want to output the profiler entry. Thus
// in these cases we do not interrupt lock acquisition even though the opCtx has already
// been killed. In the meantime we need to make sure replication state changes can still
// interrupt lock acquisition, otherwise there could be deadlocks when the state change
// thread is waiting for the session checked out by this opCtx while holding RSTL lock.
// However when maxLockTimeout is set, we want it to be always interruptible.
if (!opCtx->lockState()->hasMaxLockTimeout()) {
opCtx->setIgnoreInterruptsExceptForReplStateChange(true);
}
// IX lock acquisitions beyond this block will not be related to writes to system.profile.
ON_BLOCK_EXIT([opCtx, origFlowControl] {
opCtx->setIgnoreInterruptsExceptForReplStateChange(false);
opCtx->setShouldParticipateInFlowControl(origFlowControl);
});
try {
const auto dbProfilingNS = NamespaceString(dbName, "system.profile");
AutoGetCollection autoColl(opCtx, dbProfilingNS, MODE_IX);
Database* const db = autoColl.getDb();
if (!db) {
// Database disappeared.
LOGV2(20700,
"note: not profiling because db went away for {namespace}",
"note: not profiling because db went away for namespace",
"namespace"_attr = CurOp::get(opCtx)->getNS());
return;
}
// We are about to enforce prepare conflicts for the OperationContext. But it is illegal
// to change the behavior of ignoring prepare conflicts while any storage transaction is
// still active. So we need to call abandonSnapshot() to close any open transactions.
// This call is also harmless because any previous reads or writes should have already
// completed, as profile() is called at the end of an operation.
opCtx->recoveryUnit()->abandonSnapshot();
// The profiler performs writes even after read commands. Ignoring prepare conflicts is
// not allowed while performing writes, so temporarily enforce prepare conflicts.
EnforcePrepareConflictsBlock enforcePrepare(opCtx);
uassertStatusOK(createProfileCollection(opCtx, db));
auto coll =
CollectionCatalog::get(opCtx)->lookupCollectionByNamespace(opCtx, dbProfilingNS);
invariant(!opCtx->shouldParticipateInFlowControl());
WriteUnitOfWork wuow(opCtx);
OpDebug* const nullOpDebug = nullptr;
uassertStatusOK(coll->insertDocument(opCtx, InsertStatement(p), nullOpDebug, false));
wuow.commit();
} catch (const AssertionException& assertionEx) {
LOGV2_WARNING(20703,
"Caught Assertion while trying to profile {operation} against "
"{namespace}: {assertion}",
"Caught Assertion while trying to profile operation",
"operation"_attr = networkOpToString(op),
"namespace"_attr = CurOp::get(opCtx)->getNS(),
"assertion"_attr = redact(assertionEx));
}
}
Status createProfileCollection(OperationContext* opCtx, Database* db) {
invariant(opCtx->lockState()->isDbLockedForMode(db->name().db(), MODE_IX));
invariant(!opCtx->shouldParticipateInFlowControl());
const auto dbProfilingNS = NamespaceString(db->name().db(), "system.profile");
// Checking the collection exists must also be done in the WCE retry loop. Only retrying
// collection creation would endlessly throw errors because the collection exists: must check
// and see the collection exists in order to break free.
return writeConflictRetry(opCtx, "createProfileCollection", dbProfilingNS.ns(), [&] {
const CollectionPtr collection =
CollectionCatalog::get(opCtx)->lookupCollectionByNamespace(opCtx, dbProfilingNS);
if (collection) {
if (!collection->isCapped()) {
return Status(ErrorCodes::NamespaceExists,
str::stream() << dbProfilingNS << " exists but isn't capped");
}
return Status::OK();
}
// system.profile namespace doesn't exist; create it
LOGV2(20701,
"Creating profile collection: {namespace}",
"Creating profile collection",
"namespace"_attr = dbProfilingNS);
CollectionOptions collectionOptions;
collectionOptions.capped = true;
collectionOptions.cappedSize = 1024 * 1024;
WriteUnitOfWork wunit(opCtx);
repl::UnreplicatedWritesBlock uwb(opCtx);
invariant(db->createCollection(opCtx, dbProfilingNS, collectionOptions));
wunit.commit();
return Status::OK();
});
}
} // namespace mongo
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