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/**
* Copyright (C) 2022-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/executor/async_rpc.h"
#include <boost/smart_ptr.hpp>
#include <string>
#include <tuple>
#include <boost/move/utility_core.hpp>
#include <boost/optional/optional.hpp>
#include "mongo/base/error_codes.h"
#include "mongo/executor/remote_command_request.h"
#include "mongo/executor/task_executor.h"
#include "mongo/rpc/metadata.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/database_name_util.h"
#include "mongo/util/decorable.h"
#include "mongo/util/fail_point.h"
#include "mongo/util/future.h"
#include "mongo/util/future_impl.h"
#include "mongo/util/net/hostandport.h"
namespace mongo::async_rpc {
namespace detail {
namespace {
const auto getRCRImpl = ServiceContext::declareDecoration<std::unique_ptr<AsyncRPCRunner>>();
} // namespace
MONGO_FAIL_POINT_DEFINE(pauseAsyncRPCAfterNetworkResponse);
MONGO_FAIL_POINT_DEFINE(pauseScheduleCallWithCancelTokenUntilCanceled);
class AsyncRPCRunnerImpl : public AsyncRPCRunner {
public:
/**
* Executes the BSON command asynchronously on the given target.
*
* Do not call directly - this is not part of the public API.
*/
ExecutorFuture<AsyncRPCInternalResponse> _sendCommand(
std::shared_ptr<TaskExecutor> exec,
CancellationToken token,
OperationContext* opCtx,
Targeter* targeter,
const DatabaseName& dbName,
BSONObj cmdBSON,
BatonHandle baton,
boost::optional<UUID> clientOperationKey) final {
auto proxyExec = std::make_shared<ProxyingExecutor>(exec, baton);
return targeter->resolve(token)
.thenRunOn(proxyExec)
.then([dbName,
cmdBSON,
opCtx,
exec = std::move(exec),
token,
baton = std::move(baton),
clientOperationKey](std::vector<HostAndPort> targets) {
invariant(targets.size(),
"Successful targeting implies there are hosts to target.");
executor::RemoteCommandRequestOnAny executorRequest(
targets,
dbName,
cmdBSON,
rpc::makeEmptyMetadata(),
opCtx,
executor::RemoteCommandRequest::kNoTimeout,
{},
clientOperationKey);
// Fail point to make this method to wait until the token is canceled.
if (!token.isCanceled()) {
try {
pauseScheduleCallWithCancelTokenUntilCanceled.pauseWhileSetAndNotCanceled(
Interruptible::notInterruptible(), token);
} catch (ExceptionFor<ErrorCodes::Interrupted>&) {
// Swallow the interrupted exception that arrives from canceling a
// failpoint.
}
}
auto [p, f] = makePromiseFuture<TaskExecutor::RemoteCommandOnAnyCallbackArgs>();
auto swCallbackHandle = exec->scheduleRemoteCommandOnAny(
executorRequest,
[p = std::make_shared<Promise<TaskExecutor::RemoteCommandOnAnyCallbackArgs>>(
std::move(p))](
const TaskExecutor::RemoteCommandOnAnyCallbackArgs& cbData) {
pauseAsyncRPCAfterNetworkResponse.pauseWhileSet();
p->emplaceValue(cbData);
},
std::move(baton));
uassertStatusOK(swCallbackHandle);
token.onCancel()
.unsafeToInlineFuture()
.then(
[exec, callbackHandle = std::move(swCallbackHandle.getValue())]() mutable {
exec->cancel(callbackHandle);
})
.getAsync([](auto) {});
return std::move(f);
})
.onError([](Status s)
-> StatusWith<TaskExecutor::TaskExecutor::RemoteCommandOnAnyCallbackArgs> {
// If there was a scheduling error or other local error before the
// command was accepted by the executor.
return Status{AsyncRPCErrorInfo(s, {}), "Remote command execution failed"};
})
.then([targeter](TaskExecutor::RemoteCommandOnAnyCallbackArgs cbargs) {
auto r = cbargs.response;
auto s = makeErrorIfNeeded(r, r.target);
// Update targeter for errors.
if (!s.isOK() && s.code() == ErrorCodes::RemoteCommandExecutionError && r.target) {
auto extraInfo = s.extraInfo<AsyncRPCErrorInfo>();
if (extraInfo->isLocal()) {
targeter->onRemoteCommandError(*(r.target), extraInfo->asLocal()).get();
} else {
targeter
->onRemoteCommandError(*(r.target),
extraInfo->asRemote().getRemoteCommandResult())
.get();
}
}
uassertStatusOK(s);
return AsyncRPCInternalResponse{r.data, r.target.get(), *r.elapsed};
});
}
};
const auto implRegisterer =
ServiceContext::ConstructorActionRegisterer{"RemoteCommmandRunner", [](ServiceContext* ctx) {
getRCRImpl(ctx) =
std::make_unique<AsyncRPCRunnerImpl>();
}};
AsyncRPCRunner* AsyncRPCRunner::get(ServiceContext* svcCtx) {
return getRCRImpl(svcCtx).get();
}
void AsyncRPCRunner::set(ServiceContext* svcCtx, std::unique_ptr<AsyncRPCRunner> theRunner) {
getRCRImpl(svcCtx) = std::move(theRunner);
}
} // namespace detail
} // namespace mongo::async_rpc
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