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/**
* Copyright (C) 2015 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::kASIO
#include "mongo/platform/basic.h"
#include "mongo/executor/network_interface_asio.h"
#include "mongo/base/status_with.h"
#include "mongo/db/query/getmore_request.h"
#include "mongo/db/query/lite_parsed_query.h"
#include "mongo/executor/async_stream_interface.h"
#include "mongo/executor/connection_pool_asio.h"
#include "mongo/executor/downconvert_find_and_getmore_commands.h"
#include "mongo/executor/network_interface_asio.h"
#include "mongo/rpc/factory.h"
#include "mongo/rpc/metadata/metadata_hook.h"
#include "mongo/rpc/request_builder_interface.h"
#include "mongo/util/log.h"
#include "mongo/util/time_support.h"
namespace mongo {
namespace executor {
using asio::ip::tcp;
namespace {
// Metadata listener can be nullptr.
StatusWith<std::unique_ptr<Message>> messageFromRequest(const RemoteCommandRequest& request,
rpc::Protocol protocol,
rpc::EgressMetadataHook* metadataHook) {
BSONObj query = request.cmdObj;
auto requestBuilder = rpc::makeRequestBuilder(protocol);
BSONObj maybeAugmented;
// Handle outgoing request metadata.
if (metadataHook) {
BSONObjBuilder augmentedBob;
augmentedBob.appendElements(request.metadata);
auto writeStatus = callNoexcept(*metadataHook,
&rpc::EgressMetadataHook::writeRequestMetadata,
request.target,
&augmentedBob);
if (!writeStatus.isOK()) {
return writeStatus;
}
maybeAugmented = augmentedBob.obj();
} else {
maybeAugmented = request.metadata;
}
auto toSend = rpc::makeRequestBuilder(protocol)
->setDatabase(request.dbname)
.setCommandName(request.cmdObj.firstElementFieldName())
.setMetadata(maybeAugmented)
.setCommandArgs(request.cmdObj)
.done();
return std::move(toSend);
}
} // namespace
NetworkInterfaceASIO::AsyncOp::AsyncOp(NetworkInterfaceASIO* const owner,
const TaskExecutor::CallbackHandle& cbHandle,
const RemoteCommandRequest& request,
const RemoteCommandCompletionFn& onFinish,
Date_t now)
: _owner(owner),
_cbHandle(cbHandle),
_request(request),
_onFinish(onFinish),
_start(now),
_canceled(0),
_timedOut(0),
_access(std::make_shared<AsyncOp::AccessControl>()),
_inSetup(true) {}
void NetworkInterfaceASIO::AsyncOp::cancel() {
LOG(2) << "Canceling operation; original request was: " << request().toString();
std::shared_ptr<AsyncOp::AccessControl> access;
std::size_t generation;
{
stdx::lock_guard<stdx::mutex> lk(_access->mutex);
access = _access;
generation = access->id;
}
// An operation may be in mid-flight when it is canceled, so we cancel any
// in-progress async ops but do not complete the operation now.
asio::post(_owner->_io_service,
[this, access, generation] {
// Ensure 'this' pointer is still valid.
stdx::lock_guard<stdx::mutex> lk(access->mutex);
if (generation == access->id) {
_canceled.store(1);
if (_connection) {
_connection->cancel();
}
}
});
}
bool NetworkInterfaceASIO::AsyncOp::canceled() const {
return (_canceled.load() == 1);
}
bool NetworkInterfaceASIO::AsyncOp::timedOut() const {
return (_timedOut.load() == 1);
}
const TaskExecutor::CallbackHandle& NetworkInterfaceASIO::AsyncOp::cbHandle() const {
return _cbHandle;
}
NetworkInterfaceASIO::AsyncConnection& NetworkInterfaceASIO::AsyncOp::connection() {
invariant(_connection.is_initialized());
return *_connection;
}
void NetworkInterfaceASIO::AsyncOp::setConnection(AsyncConnection&& conn) {
invariant(!_connection.is_initialized());
_connection = std::move(conn);
}
Status NetworkInterfaceASIO::AsyncOp::beginCommand(Message&& newCommand,
AsyncCommand::CommandType type,
const HostAndPort& target) {
// NOTE: We operate based on the assumption that AsyncOp's
// AsyncConnection does not change over its lifetime.
invariant(_connection.is_initialized());
// Construct a new AsyncCommand object for each command.
_command.emplace(_connection.get_ptr(), type, std::move(newCommand), _owner->now(), target);
return Status::OK();
}
Status NetworkInterfaceASIO::AsyncOp::beginCommand(const RemoteCommandRequest& request,
rpc::EgressMetadataHook* metadataHook) {
// Check if we need to downconvert find or getMore commands.
StringData commandName = request.cmdObj.firstElement().fieldNameStringData();
const auto isFindCmd = commandName == LiteParsedQuery::kFindCommandName;
const auto isGetMoreCmd = commandName == GetMoreRequest::kGetMoreCommandName;
const auto isFindOrGetMoreCmd = isFindCmd || isGetMoreCmd;
// If we aren't sending a find or getMore, or the server supports OP_COMMAND we don't have
// to worry about downconversion.
if (!isFindOrGetMoreCmd || connection().serverProtocols() == rpc::supports::kAll) {
auto newCommand = messageFromRequest(request, operationProtocol(), metadataHook);
if (!newCommand.isOK()) {
return newCommand.getStatus();
}
return beginCommand(
std::move(*newCommand.getValue()), AsyncCommand::CommandType::kRPC, request.target);
} else if (isFindCmd) {
auto downconvertedFind = downconvertFindCommandRequest(request);
if (!downconvertedFind.isOK()) {
return downconvertedFind.getStatus();
}
return beginCommand(std::move(downconvertedFind.getValue()),
AsyncCommand::CommandType::kDownConvertedFind,
request.target);
} else {
invariant(isGetMoreCmd);
auto downconvertedGetMore = downconvertGetMoreCommandRequest(request);
if (!downconvertedGetMore.isOK()) {
return downconvertedGetMore.getStatus();
}
return beginCommand(std::move(downconvertedGetMore.getValue()),
AsyncCommand::CommandType::kDownConvertedGetMore,
request.target);
}
}
NetworkInterfaceASIO::AsyncCommand* NetworkInterfaceASIO::AsyncOp::command() {
invariant(_command.is_initialized());
return _command.get_ptr();
}
void NetworkInterfaceASIO::AsyncOp::finish(const ResponseStatus& status) {
_onFinish(status);
}
const RemoteCommandRequest& NetworkInterfaceASIO::AsyncOp::request() const {
return _request;
}
Date_t NetworkInterfaceASIO::AsyncOp::start() const {
return _start;
}
rpc::Protocol NetworkInterfaceASIO::AsyncOp::operationProtocol() const {
invariant(_operationProtocol.is_initialized());
return *_operationProtocol;
}
void NetworkInterfaceASIO::AsyncOp::setOperationProtocol(rpc::Protocol proto) {
invariant(!_operationProtocol.is_initialized());
_operationProtocol = proto;
}
void NetworkInterfaceASIO::AsyncOp::reset() {
// We don't reset owner as it never changes
_cbHandle = {};
_request = {};
_onFinish = {};
_connectionPoolHandle = {};
// We don't reset _connection as we want to reuse it.
// Ditto for _operationProtocol.
_start = {};
_timeoutAlarm.reset();
_canceled.store(0u);
_timedOut.store(0u);
_command = boost::none;
// _inSetup should always be false at this point.
}
void NetworkInterfaceASIO::AsyncOp::setOnFinish(RemoteCommandCompletionFn&& onFinish) {
_onFinish = std::move(onFinish);
}
} // namespace executor
} // namespace mongo
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