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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.
*/
#include "mongo/platform/basic.h"
#include "mongo/s/sessions_collection_sharded.h"
#include "mongo/db/matcher/extensions_callback_noop.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/query/canonical_query.h"
#include "mongo/db/query/query_request.h"
#include "mongo/db/sessions_collection_rs.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/rpc/op_msg.h"
#include "mongo/rpc/op_msg_rpc_impls.h"
#include "mongo/s/catalog_cache.h"
#include "mongo/s/client/shard.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/grid.h"
#include "mongo/s/query/cluster_find.h"
#include "mongo/s/write_ops/batch_write_exec.h"
#include "mongo/s/write_ops/batched_command_request.h"
#include "mongo/s/write_ops/batched_command_response.h"
#include "mongo/s/write_ops/cluster_write.h"
#include "mongo/util/assert_util.h"
namespace mongo {
namespace {
BSONObj lsidQuery(const LogicalSessionId& lsid) {
return BSON(LogicalSessionRecord::kIdFieldName << lsid.toBSON());
}
} // namespace
std::vector<LogicalSessionId> SessionsCollectionSharded::_groupSessionIdsByOwningShard(
OperationContext* opCtx, const LogicalSessionIdSet& sessions) {
const auto cm = uassertStatusOK(Grid::get(opCtx)->catalogCache()->getCollectionRoutingInfo(
opCtx, NamespaceString::kLogicalSessionsNamespace));
uassert(ErrorCodes::NamespaceNotSharded,
str::stream() << "Collection " << NamespaceString::kLogicalSessionsNamespace
<< " is not sharded",
cm.isSharded());
std::multimap<ShardId, LogicalSessionId> sessionIdsByOwningShard;
for (const auto& session : sessions) {
sessionIdsByOwningShard.emplace(
cm.findIntersectingChunkWithSimpleCollation(session.getId().toBSON()).getShardId(),
session);
}
std::vector<LogicalSessionId> sessionIdsGroupedByShard;
sessionIdsGroupedByShard.reserve(sessions.size());
for (auto& session : sessionIdsByOwningShard) {
sessionIdsGroupedByShard.emplace_back(std::move(session.second));
}
return sessionIdsGroupedByShard;
}
std::vector<LogicalSessionRecord> SessionsCollectionSharded::_groupSessionRecordsByOwningShard(
OperationContext* opCtx, const LogicalSessionRecordSet& sessions) {
const auto cm = uassertStatusOK(Grid::get(opCtx)->catalogCache()->getCollectionRoutingInfo(
opCtx, NamespaceString::kLogicalSessionsNamespace));
uassert(ErrorCodes::NamespaceNotSharded,
str::stream() << "Collection " << NamespaceString::kLogicalSessionsNamespace
<< " is not sharded",
cm.isSharded());
std::multimap<ShardId, LogicalSessionRecord> sessionsByOwningShard;
for (const auto& session : sessions) {
sessionsByOwningShard.emplace(
cm.findIntersectingChunkWithSimpleCollation(session.getId().toBSON()).getShardId(),
session);
}
std::vector<LogicalSessionRecord> sessionRecordsGroupedByShard;
sessionRecordsGroupedByShard.reserve(sessions.size());
for (auto& session : sessionsByOwningShard) {
sessionRecordsGroupedByShard.emplace_back(std::move(session.second));
}
return sessionRecordsGroupedByShard;
}
void SessionsCollectionSharded::setupSessionsCollection(OperationContext* opCtx) {
checkSessionsCollectionExists(opCtx);
}
void SessionsCollectionSharded::checkSessionsCollectionExists(OperationContext* opCtx) {
uassert(ErrorCodes::ShardingStateNotInitialized,
"sharding state is not yet initialized",
Grid::get(opCtx)->isShardingInitialized());
// If the collection doesn't exist, fail. Only the config servers generate it.
const auto cm = uassertStatusOK(
Grid::get(opCtx)->catalogCache()->getShardedCollectionRoutingInfoWithRefresh(
opCtx, NamespaceString::kLogicalSessionsNamespace));
uassert(ErrorCodes::NamespaceNotFound, "config.system.sessions does not exist", cm.isSharded());
}
void SessionsCollectionSharded::refreshSessions(OperationContext* opCtx,
const LogicalSessionRecordSet& sessions) {
auto send = [&](BSONObj toSend) {
auto opMsg =
OpMsgRequest::fromDBAndBody(NamespaceString::kLogicalSessionsNamespace.db(), toSend);
auto request = BatchedCommandRequest::parseUpdate(opMsg);
BatchedCommandResponse response;
BatchWriteExecStats stats;
ClusterWriter::write(opCtx, request, &stats, &response);
uassertStatusOK(response.toStatus());
};
_doRefresh(NamespaceString::kLogicalSessionsNamespace,
_groupSessionRecordsByOwningShard(opCtx, sessions),
send);
}
void SessionsCollectionSharded::removeRecords(OperationContext* opCtx,
const LogicalSessionIdSet& sessions) {
auto send = [&](BSONObj toSend) {
auto opMsg =
OpMsgRequest::fromDBAndBody(NamespaceString::kLogicalSessionsNamespace.db(), toSend);
auto request = BatchedCommandRequest::parseDelete(opMsg);
BatchedCommandResponse response;
BatchWriteExecStats stats;
ClusterWriter::write(opCtx, request, &stats, &response);
uassertStatusOK(response.toStatus());
};
_doRemove(NamespaceString::kLogicalSessionsNamespace,
_groupSessionIdsByOwningShard(opCtx, sessions),
send);
}
LogicalSessionIdSet SessionsCollectionSharded::findRemovedSessions(
OperationContext* opCtx, const LogicalSessionIdSet& sessions) {
auto send = [&](BSONObj toSend) -> BSONObj {
auto qr = uassertStatusOK(QueryRequest::makeFromFindCommand(
NamespaceString::kLogicalSessionsNamespace, toSend, false));
const boost::intrusive_ptr<ExpressionContext> expCtx;
auto cq = uassertStatusOK(
CanonicalQuery::canonicalize(opCtx,
std::move(qr),
expCtx,
ExtensionsCallbackNoop(),
MatchExpressionParser::kBanAllSpecialFeatures));
// Do the work to generate the first batch of results. This blocks waiting to get responses
// from the shard(s).
std::vector<BSONObj> batch;
CursorId cursorId;
cursorId = ClusterFind::runQuery(opCtx, *cq, ReadPreferenceSetting::get(opCtx), &batch);
rpc::OpMsgReplyBuilder replyBuilder;
CursorResponseBuilder::Options options;
options.isInitialResponse = true;
CursorResponseBuilder firstBatch(&replyBuilder, options);
for (const auto& obj : batch) {
firstBatch.append(obj);
}
firstBatch.done(cursorId, NamespaceString::kLogicalSessionsNamespace.ns());
return replyBuilder.releaseBody();
};
return _doFindRemoved(NamespaceString::kLogicalSessionsNamespace,
_groupSessionIdsByOwningShard(opCtx, sessions),
send);
}
} // namespace mongo
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