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/**
* Copyright (C) 2016 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::kNetwork
#include "mongo/platform/basic.h"
#include "mongo/s/service_entry_point_mongos.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/dbmessage.h"
#include "mongo/db/lasterror.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/service_context.h"
#include "mongo/s/client/shard_connection.h"
#include "mongo/s/cluster_last_error_info.h"
#include "mongo/s/commands/strategy.h"
#include "mongo/transport/service_entry_point_utils.h"
#include "mongo/transport/session.h"
#include "mongo/transport/transport_layer.h"
#include "mongo/util/log.h"
#include "mongo/util/net/message.h"
#include "mongo/util/net/thread_idle_callback.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
using transport::TransportLayer;
namespace {
BSONObj buildErrReply(const DBException& ex) {
BSONObjBuilder errB;
errB.append("$err", ex.what());
errB.append("code", ex.getCode());
if (!ex._shard.empty()) {
errB.append("shard", ex._shard);
}
return errB.obj();
}
} // namespace
ServiceEntryPointMongos::ServiceEntryPointMongos(TransportLayer* tl) : _tl(tl) {}
void ServiceEntryPointMongos::startSession(transport::SessionHandle session) {
launchWrappedServiceEntryWorkerThread(
std::move(session),
[this](const transport::SessionHandle& session) { _sessionLoop(session); });
}
void ServiceEntryPointMongos::_sessionLoop(const transport::SessionHandle& session) {
int64_t counter = 0;
while (true) {
// Release any cached egress connections for client back to pool before destroying
auto guard = MakeGuard(ShardConnection::releaseMyConnections);
Message message;
// Source a Message from the client
{
auto status = session->sourceMessage(&message).wait();
if (ErrorCodes::isInterruption(status.code()) ||
ErrorCodes::isNetworkError(status.code())) {
break;
}
// Our session may have been closed internally.
if (status == TransportLayer::TicketSessionClosedStatus) {
break;
}
uassertStatusOK(status);
}
auto txn = cc().makeOperationContext();
const int32_t msgId = message.header().getId();
const NetworkOp op = message.operation();
// This exception will not be returned to the caller, but will be logged and will close the
// connection
uassert(ErrorCodes::IllegalOperation,
str::stream() << "Message type " << op << " is not supported.",
op > dbMsg);
// Start a new LastError session. Any exceptions thrown from here onwards will be returned
// to the caller (if the type of the message permits it).
ClusterLastErrorInfo::get(txn->getClient()).newRequest();
LastError::get(txn->getClient()).startRequest();
DbMessage dbm(message);
NamespaceString nss;
try {
if (dbm.messageShouldHaveNs()) {
nss = NamespaceString(StringData(dbm.getns()));
uassert(ErrorCodes::InvalidNamespace,
str::stream() << "Invalid ns [" << nss.ns() << "]",
nss.isValid());
uassert(ErrorCodes::IllegalOperation,
"Can't use 'local' database through mongos",
nss.db() != NamespaceString::kLocalDb);
}
AuthorizationSession::get(txn->getClient())->startRequest(txn.get());
LOG(3) << "Request::process begin ns: " << nss << " msg id: " << msgId
<< " op: " << networkOpToString(op);
switch (op) {
case dbQuery:
if (nss.isCommand() || nss.isSpecialCommand()) {
Strategy::clientCommandOp(txn.get(), nss, &dbm);
} else {
Strategy::queryOp(txn.get(), nss, &dbm);
}
break;
case dbGetMore:
Strategy::getMore(txn.get(), nss, &dbm);
break;
case dbKillCursors:
Strategy::killCursors(txn.get(), &dbm);
break;
default:
Strategy::writeOp(txn.get(), &dbm);
break;
}
LOG(3) << "Request::process end ns: " << nss << " msg id: " << msgId
<< " op: " << networkOpToString(op);
} catch (const DBException& ex) {
LOG(1) << "Exception thrown"
<< " while processing " << networkOpToString(op) << " op"
<< " for " << nss.ns() << causedBy(ex);
if (op == dbQuery || op == dbGetMore) {
replyToQuery(ResultFlag_ErrSet, session, message, buildErrReply(ex));
}
// We *always* populate the last error for now
LastError::get(txn->getClient()).setLastError(ex.getCode(), ex.what());
}
if ((counter++ & 0xf) == 0) {
markThreadIdle();
}
}
}
} // namespace mongo
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