1
2 /**
3 * Copyright (C) 2018-present MongoDB, Inc.
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the Server Side Public License, version 1,
7 * as published by MongoDB, Inc.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * Server Side Public License for more details.
13 *
14 * You should have received a copy of the Server Side Public License
15 * along with this program. If not, see
16 * <http://www.mongodb.com/licensing/server-side-public-license>.
17 *
18 * As a special exception, the copyright holders give permission to link the
19 * code of portions of this program with the OpenSSL library under certain
20 * conditions as described in each individual source file and distribute
21 * linked combinations including the program with the OpenSSL library. You
22 * must comply with the Server Side Public License in all respects for
23 * all of the code used other than as permitted herein. If you modify file(s)
24 * with this exception, you may extend this exception to your version of the
25 * file(s), but you are not obligated to do so. If you do not wish to do so,
26 * delete this exception statement from your version. If you delete this
27 * exception statement from all source files in the program, then also delete
28 * it in the license file.
29 */
30
31 #define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kSharding
32
33 #include <boost/none_t.hpp>
34
35 #include "mongo/platform/basic.h"
36
37 #include "mongo/s/client/shard_local.h"
38
39 #include "mongo/base/status.h"
40 #include "mongo/base/status_with.h"
41 #include "mongo/client/remote_command_targeter.h"
42 #include "mongo/db/curop.h"
43 #include "mongo/db/dbdirectclient.h"
44 #include "mongo/db/repl/repl_client_info.h"
45 #include "mongo/db/repl/repl_set_config.h"
46 #include "mongo/db/repl/replication_coordinator_global.h"
47 #include "mongo/rpc/get_status_from_command_result.h"
48 #include "mongo/rpc/unique_message.h"
49 #include "mongo/util/log.h"
50 #include "mongo/util/scopeguard.h"
51
52 namespace mongo {
53
ShardLocal(const ShardId & id)54 ShardLocal::ShardLocal(const ShardId& id) : Shard(id), _rsLocalClient() {
55 // Currently ShardLocal only works for config servers. If we ever start using ShardLocal on
56 // shards we'll need to consider how to handle shards.
57 invariant(serverGlobalParams.clusterRole == ClusterRole::ConfigServer);
58 }
59
getConnString() const60 const ConnectionString ShardLocal::getConnString() const {
61 return repl::getGlobalReplicationCoordinator()->getConfig().getConnectionString();
62 }
63
getTargeter() const64 std::shared_ptr<RemoteCommandTargeter> ShardLocal::getTargeter() const {
65 MONGO_UNREACHABLE;
66 };
67
originalConnString() const68 const ConnectionString ShardLocal::originalConnString() const {
69 // Return the local connection string here as this method is only used for updating the
70 // ShardRegistry and we don't need a mapping from hosts in the replica set config to the shard
71 // for local shards.
72 return ConnectionString::forLocal();
73 }
74
updateReplSetMonitor(const HostAndPort & remoteHost,const Status & remoteCommandStatus)75 void ShardLocal::updateReplSetMonitor(const HostAndPort& remoteHost,
76 const Status& remoteCommandStatus) {
77 MONGO_UNREACHABLE;
78 }
79
toString() const80 std::string ShardLocal::toString() const {
81 return getId().toString() + ":<local>";
82 }
83
isRetriableError(ErrorCodes::Error code,RetryPolicy options)84 bool ShardLocal::isRetriableError(ErrorCodes::Error code, RetryPolicy options) {
85 if (options == RetryPolicy::kNoRetry) {
86 return false;
87 }
88
89 if (options == RetryPolicy::kIdempotent) {
90 return code == ErrorCodes::WriteConcernFailed;
91 } else {
92 invariant(options == RetryPolicy::kNotIdempotent);
93 return false;
94 }
95 }
96
_runCommand(OperationContext * opCtx,const ReadPreferenceSetting & unused,const std::string & dbName,Milliseconds maxTimeMSOverrideUnused,const BSONObj & cmdObj)97 StatusWith<Shard::CommandResponse> ShardLocal::_runCommand(OperationContext* opCtx,
98 const ReadPreferenceSetting& unused,
99 const std::string& dbName,
100 Milliseconds maxTimeMSOverrideUnused,
101 const BSONObj& cmdObj) {
102 return _rsLocalClient.runCommandOnce(opCtx, dbName, cmdObj);
103 }
104
_exhaustiveFindOnConfig(OperationContext * opCtx,const ReadPreferenceSetting & readPref,const repl::ReadConcernLevel & readConcernLevel,const NamespaceString & nss,const BSONObj & query,const BSONObj & sort,boost::optional<long long> limit)105 StatusWith<Shard::QueryResponse> ShardLocal::_exhaustiveFindOnConfig(
106 OperationContext* opCtx,
107 const ReadPreferenceSetting& readPref,
108 const repl::ReadConcernLevel& readConcernLevel,
109 const NamespaceString& nss,
110 const BSONObj& query,
111 const BSONObj& sort,
112 boost::optional<long long> limit) {
113 return _rsLocalClient.queryOnce(opCtx, readPref, readConcernLevel, nss, query, sort, limit);
114 }
115
createIndexOnConfig(OperationContext * opCtx,const NamespaceString & ns,const BSONObj & keys,bool unique)116 Status ShardLocal::createIndexOnConfig(OperationContext* opCtx,
117 const NamespaceString& ns,
118 const BSONObj& keys,
119 bool unique) {
120 invariant(ns.db() == "config" || ns.db() == "admin");
121
122 try {
123 DBDirectClient client(opCtx);
124 IndexSpec index;
125 index.addKeys(keys);
126 index.unique(unique);
127 client.createIndex(ns.toString(), index);
128 } catch (const DBException& e) {
129 return e.toStatus();
130 }
131
132 return Status::OK();
133 }
134
135 } // namespace mongo
136