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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::kTransaction
#include "mongo/platform/basic.h"
#include "mongo/db/transaction_coordinator_commands_impl.h"
#include "mongo/client/remote_command_targeter.h"
#include "mongo/db/commands/txn_cmds_gen.h"
#include "mongo/db/operation_context_session_mongod.h"
#include "mongo/executor/task_executor_pool.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/s/async_requests_sender.h"
#include "mongo/s/grid.h"
#include "mongo/util/log.h"
namespace mongo {
namespace {
/**
* Finds the host and port for a shard.
*/
StatusWith<HostAndPort> targetHost(OperationContext* opCtx,
const ShardId& shardId,
const ReadPreferenceSetting& readPref) {
auto shard = Grid::get(getGlobalServiceContext())->shardRegistry()->getShardNoReload(shardId);
if (!shard) {
return Status(ErrorCodes::ShardNotFound,
str::stream() << "Could not find shard " << shardId);
}
auto targeter = shard->getTargeter();
return targeter->findHost(opCtx, readPref);
}
using CallbackFn = stdx::function<void(Status status, const ShardId& shardID)>;
/**
* Sends the given command object to the given shard ID. If scheduling and running the command is
* successful, calls the callback with the status of the command response and the shard ID.
*/
void sendAsyncCommandToShard(OperationContext* opCtx,
executor::TaskExecutor* executor,
const ShardId& shardId,
const BSONObj& commandObj,
CallbackFn callbackOnCommandResponse) {
auto readPref = ReadPreferenceSetting(ReadPreference::PrimaryOnly);
auto swShardHostAndPort = targetHost(opCtx, shardId, readPref);
if (!swShardHostAndPort.isOK()) {
LOG(3) << "Coordinator shard failed to target primary host of participant shard for "
<< commandObj << causedBy(swShardHostAndPort.getStatus());
return;
}
executor::RemoteCommandRequest request(
swShardHostAndPort.getValue(), "admin", commandObj, readPref.toContainingBSON(), nullptr);
auto swCallbackHandle = executor->scheduleRemoteCommand(
request,
[commandObj, shardId, callbackOnCommandResponse](
const executor::TaskExecutor::RemoteCommandCallbackArgs& args) {
auto status = (!args.response.isOK()) ? args.response.status
: getStatusFromCommandResult(args.response.data);
LOG(3) << "Coordinator shard got response " << status << " for " << commandObj << " to "
<< shardId;
// Only call callback if command successfully executed and got a response.
if (args.response.isOK()) {
callbackOnCommandResponse(status, shardId);
}
});
if (!swCallbackHandle.isOK()) {
LOG(3) << "Coordinator shard failed to schedule the task to send " << commandObj
<< " to shard " << shardId << causedBy(swCallbackHandle.getStatus());
}
// Do not wait for the callback to run.
}
/**
* Sends the given command object to all shards in the set of shard IDs. For each shard ID, if
* scheduling and running the command is successful, calls the callback with the status of the
* command response and the shard ID.
*/
void sendAsyncCommandToShards(OperationContext* opCtx,
const std::set<ShardId>& shardIds,
const BSONObj& commandObj,
CallbackFn callbackOnCommandResponse) {
// TODO (SERVER-36638): Change to arbitrary task executor? Unit test only supports fixed
// executor.
auto exec = Grid::get(opCtx)->getExecutorPool()->getFixedExecutor();
StringBuilder ss;
ss << "[";
// For each non-acked participant, launch an async task to target its shard
// and then asynchronously send the command.
for (const auto& shardId : shardIds) {
sendAsyncCommandToShard(opCtx, exec, shardId, commandObj, callbackOnCommandResponse);
ss << shardId << " ";
}
ss << "]";
LOG(3) << "Coordinator shard sending " << commandObj << " to " << ss.str();
}
} // namespace
namespace txn {
void sendCommit(OperationContext* opCtx,
std::shared_ptr<TransactionCoordinator> coordinator,
const std::set<ShardId>& nonAckedParticipants,
Timestamp commitTimestamp) {
invariant(coordinator);
CommitTransaction commitTransaction;
commitTransaction.setCommitTimestamp(commitTimestamp);
commitTransaction.setDbName("admin");
BSONObj commitObj = commitTransaction.toBSON(BSON(
"lsid" << opCtx->getLogicalSessionId()->toBSON() << "txnNumber" << *opCtx->getTxnNumber()
<< "autocommit"
<< false));
sendAsyncCommandToShards(opCtx,
nonAckedParticipants,
commitObj,
[coordinator](Status commandResponseStatus, const ShardId& shardId) {
// TODO (SERVER-36642): Also interpret TransactionTooOld as
// acknowledgment.
if (commandResponseStatus.isOK()) {
coordinator->recvCommitAck(shardId);
}
});
}
void sendAbort(OperationContext* opCtx, const std::set<ShardId>& nonVotedAbortParticipants) {
// TODO (SERVER-36584) Use IDL to create command BSON.
BSONObj abortObj = BSON(
"abortTransaction" << 1 << "lsid" << opCtx->getLogicalSessionId()->toBSON() << "txnNumber"
<< *opCtx->getTxnNumber()
<< "autocommit"
<< false);
sendAsyncCommandToShards(
opCtx, nonVotedAbortParticipants, abortObj, [](Status, const ShardId&) {});
}
} // namespace txn
} // namespace mongo
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