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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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kDefault
#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/auth/user_set.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/client.h"
#include "mongo/db/curop.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/jsobj.h"
#include "mongo/rpc/metadata/client_metadata.h"
#include "mongo/rpc/metadata/client_metadata_ismaster.h"
#include "mongo/util/log.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
using std::endl;
using std::string;
using std::unique_ptr;
namespace {
void _appendUserInfo(const CurOp& c, BSONObjBuilder& builder, AuthorizationSession* authSession) {
UserNameIterator nameIter = authSession->getAuthenticatedUserNames();
UserName bestUser;
if (nameIter.more())
bestUser = *nameIter;
std::string opdb(nsToDatabase(c.getNS()));
BSONArrayBuilder allUsers(builder.subarrayStart("allUsers"));
for (; nameIter.more(); nameIter.next()) {
BSONObjBuilder nextUser(allUsers.subobjStart());
nextUser.append(AuthorizationManager::USER_NAME_FIELD_NAME, nameIter->getUser());
nextUser.append(AuthorizationManager::USER_DB_FIELD_NAME, nameIter->getDB());
nextUser.doneFast();
if (nameIter->getDB() == opdb) {
bestUser = *nameIter;
}
}
allUsers.doneFast();
builder.append("user", bestUser.getUser().empty() ? "" : bestUser.getFullName());
}
} // namespace
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);
}
b.appendDate("ts", jsTime());
b.append("client", opCtx->getClient()->clientAddress());
const auto& clientMetadata =
ClientMetadataIsMasterState::get(opCtx->getClient()).getClientMetadata();
if (clientMetadata) {
auto appName = clientMetadata.get().getApplicationName();
if (!appName.empty()) {
b.append("appName", appName);
}
}
AuthorizationSession* authSession = AuthorizationSession::get(opCtx->getClient());
_appendUserInfo(*CurOp::get(opCtx), b, authSession);
const BSONObj p = b.done();
const bool wasLocked = opCtx->lockState()->isLocked();
const string dbName(nsToDatabase(CurOp::get(opCtx)->getNS()));
// True if we need to acquire an X lock on the database in order to create the system.profile
// collection.
bool acquireDbXLock = false;
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);
// IX lock acquisitions beyond this block will not be related to writes to system.profile.
ON_BLOCK_EXIT(
[opCtx, origFlowControl] { opCtx->setShouldParticipateInFlowControl(origFlowControl); });
try {
// Even if the operation we are profiling was interrupted, we still want to output the
// profiler entry. This lock guard will prevent lock acquisitions from throwing exceptions
// before we finish writing the entry. However, our maximum lock timeout overrides
// uninterruptibility.
boost::optional<UninterruptibleLockGuard> noInterrupt;
if (!opCtx->lockState()->hasMaxLockTimeout()) {
noInterrupt.emplace(opCtx->lockState());
}
while (true) {
std::unique_ptr<AutoGetDb> autoGetDb;
if (acquireDbXLock) {
// We should not attempt to acquire an X lock while in "noInterrupt" scope.
noInterrupt.reset();
autoGetDb.reset(new AutoGetDb(opCtx, dbName, MODE_X));
if (autoGetDb->getDb()) {
createProfileCollection(opCtx, autoGetDb->getDb()).transitional_ignore();
}
} else {
autoGetDb.reset(new AutoGetDb(opCtx, dbName, MODE_IX));
}
Database* const db = autoGetDb->getDb();
if (!db) {
// Database disappeared
log() << "note: not profiling because db went away for "
<< CurOp::get(opCtx)->getNS();
break;
}
Lock::CollectionLock collLock(opCtx, db->getProfilingNS(), MODE_IX);
// 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);
Collection* const coll = db->getCollection(opCtx, db->getProfilingNS());
if (coll) {
invariant(!opCtx->shouldParticipateInFlowControl());
WriteUnitOfWork wuow(opCtx);
OpDebug* const nullOpDebug = nullptr;
coll->insertDocument(opCtx, InsertStatement(p), nullOpDebug, false)
.transitional_ignore();
wuow.commit();
break;
} else if (!acquireDbXLock &&
(!wasLocked || opCtx->lockState()->isDbLockedForMode(dbName, MODE_X))) {
// Try to create the collection only if we are not under lock, in order to
// avoid deadlocks due to lock conversion. This would only be hit if someone
// deletes the profiler collection after setting profile level.
acquireDbXLock = true;
} else {
// Cannot write the profile information
break;
}
}
} catch (const AssertionException& assertionEx) {
if (acquireDbXLock && ErrorCodes::isInterruption(assertionEx)) {
warning()
<< "Interrupted while attempting to create profile collection in database "
<< dbName << " to profile operation " << networkOpToString(op) << " against "
<< CurOp::get(opCtx)->getNS()
<< ". Manually create profile collection to ensure future operations are logged.";
} else {
warning() << "Caught Assertion while trying to profile " << networkOpToString(op)
<< " against " << CurOp::get(opCtx)->getNS() << ": " << redact(assertionEx);
}
}
}
Status createProfileCollection(OperationContext* opCtx, Database* db) {
invariant(opCtx->lockState()->isDbLockedForMode(db->name(), MODE_X));
invariant(!opCtx->shouldParticipateInFlowControl());
auto& dbProfilingNS = db->getProfilingNS();
Collection* const collection = db->getCollection(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
log() << "Creating profile collection: " << 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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