1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
/**
* Copyright (C) 2014 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/base/status_with.h"
#include "mongo/bson/util/bson_extract.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/commands.h"
#include "mongo/db/commands/find_and_modify_common.h"
#include "mongo/db/query/collation/collator_factory_interface.h"
#include "mongo/executor/task_executor_pool.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/s/balancer_configuration.h"
#include "mongo/s/catalog_cache.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/cluster_commands_helpers.h"
#include "mongo/s/commands/cluster_explain.h"
#include "mongo/s/commands/strategy.h"
#include "mongo/s/grid.h"
#include "mongo/s/multi_statement_transaction_requests_sender.h"
#include "mongo/s/stale_exception.h"
#include "mongo/s/transaction_router.h"
#include "mongo/s/write_ops/cluster_write.h"
#include "mongo/util/timer.h"
namespace mongo {
namespace {
const ReadPreferenceSetting kPrimaryOnlyReadPreference(ReadPreference::PrimaryOnly);
BSONObj getCollation(const BSONObj& cmdObj) {
BSONElement collationElement;
auto status = bsonExtractTypedField(cmdObj, "collation", BSONType::Object, &collationElement);
if (status.isOK()) {
return collationElement.Obj();
} else if (status != ErrorCodes::NoSuchKey) {
uassertStatusOK(status);
}
return BSONObj();
}
BSONObj getShardKey(OperationContext* opCtx, const ChunkManager& chunkMgr, const BSONObj& query) {
BSONObj shardKey =
uassertStatusOK(chunkMgr.getShardKeyPattern().extractShardKeyFromQuery(opCtx, query));
uassert(ErrorCodes::ShardKeyNotFound,
"Query for sharded findAndModify must contain the shard key",
!shardKey.isEmpty());
return shardKey;
}
class FindAndModifyCmd : public BasicCommand {
public:
FindAndModifyCmd() : BasicCommand("findAndModify", "findandmodify") {}
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kAlways;
}
bool adminOnly() const override {
return false;
}
bool supportsWriteConcern(const BSONObj& cmd) const override {
return true;
}
bool supportsReadConcern(const std::string& dbName,
const BSONObj& cmdObj,
repl::ReadConcernLevel level) const final {
return true;
}
void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) const override {
find_and_modify::addPrivilegesRequiredForFindAndModify(this, dbname, cmdObj, out);
}
Status explain(OperationContext* opCtx,
const OpMsgRequest& request,
ExplainOptions::Verbosity verbosity,
rpc::ReplyBuilderInterface* result) const override {
std::string dbName = request.getDatabase().toString();
const BSONObj& cmdObj = request.body;
const NamespaceString nss(CommandHelpers::parseNsCollectionRequired(dbName, cmdObj));
auto routingInfo =
uassertStatusOK(Grid::get(opCtx)->catalogCache()->getCollectionRoutingInfo(opCtx, nss));
std::shared_ptr<ChunkManager> chunkMgr;
std::shared_ptr<Shard> shard;
if (!routingInfo.cm()) {
shard = routingInfo.db().primary();
} else {
chunkMgr = routingInfo.cm();
const BSONObj query = cmdObj.getObjectField("query");
const BSONObj collation = getCollation(cmdObj);
const BSONObj shardKey = getShardKey(opCtx, *chunkMgr, query);
const auto chunk = chunkMgr->findIntersectingChunk(shardKey, collation);
shard = uassertStatusOK(
Grid::get(opCtx)->shardRegistry()->getShard(opCtx, chunk.getShardId()));
}
const auto explainCmd = ClusterExplain::wrapAsExplain(cmdObj, verbosity);
// Time how long it takes to run the explain command on the shard.
Timer timer;
BSONObjBuilder bob;
_runCommand(opCtx,
shard->getId(),
(chunkMgr ? chunkMgr->getVersion(shard->getId()) : ChunkVersion::UNSHARDED()),
nss,
explainCmd,
&bob);
const auto millisElapsed = timer.millis();
Strategy::CommandResult cmdResult;
cmdResult.shardTargetId = shard->getId();
cmdResult.target = shard->getConnString();
cmdResult.result = bob.obj();
std::vector<Strategy::CommandResult> shardResults;
shardResults.push_back(cmdResult);
auto bodyBuilder = result->getBodyBuilder();
return ClusterExplain::buildExplainResult(
opCtx, shardResults, ClusterExplain::kSingleShard, millisElapsed, &bodyBuilder);
}
bool run(OperationContext* opCtx,
const std::string& dbName,
const BSONObj& cmdObj,
BSONObjBuilder& result) override {
const NamespaceString nss(CommandHelpers::parseNsCollectionRequired(dbName, cmdObj));
// findAndModify should only be creating database if upsert is true, but this would require
// that the parsing be pulled into this function.
uassertStatusOK(createShardDatabase(opCtx, nss.db()));
const auto routingInfo = uassertStatusOK(getCollectionRoutingInfoForTxnCmd(opCtx, nss));
if (!routingInfo.cm()) {
_runCommand(opCtx,
routingInfo.db().primaryId(),
ChunkVersion::UNSHARDED(),
nss,
cmdObj,
&result);
return true;
}
const auto chunkMgr = routingInfo.cm();
const BSONObj query = cmdObj.getObjectField("query");
const BSONObj collation = getCollation(cmdObj);
const BSONObj shardKey = getShardKey(opCtx, *chunkMgr, query);
auto chunk = chunkMgr->findIntersectingChunk(shardKey, collation);
_runCommand(opCtx,
chunk.getShardId(),
chunkMgr->getVersion(chunk.getShardId()),
nss,
cmdObj,
&result);
return true;
}
private:
static void _runCommand(OperationContext* opCtx,
const ShardId& shardId,
const ChunkVersion& shardVersion,
const NamespaceString& nss,
const BSONObj& cmdObj,
BSONObjBuilder* result) {
const auto response = [&] {
std::vector<AsyncRequestsSender::Request> requests;
requests.emplace_back(
shardId,
appendShardVersion(CommandHelpers::filterCommandRequestForPassthrough(cmdObj),
shardVersion));
MultiStatementTransactionRequestsSender ars(
opCtx,
Grid::get(opCtx)->getExecutorPool()->getArbitraryExecutor(),
nss.db().toString(),
requests,
kPrimaryOnlyReadPreference,
opCtx->getTxnNumber() ? Shard::RetryPolicy::kIdempotent
: Shard::RetryPolicy::kNoRetry);
auto response = ars.next();
invariant(ars.done());
return uassertStatusOK(std::move(response.swResponse));
}();
uassertStatusOK(response.status);
const auto responseStatus = getStatusFromCommandResult(response.data);
if (ErrorCodes::isNeedRetargettingError(responseStatus.code()) ||
ErrorCodes::isSnapshotError(responseStatus.code())) {
// Command code traps this exception and re-runs
uassertStatusOK(responseStatus.withContext("findAndModify"));
}
// First append the properly constructed writeConcernError. It will then be skipped in
// appendElementsUnique.
if (auto wcErrorElem = response.data["writeConcernError"]) {
appendWriteConcernErrorToCmdResponse(shardId, wcErrorElem, *result);
}
result->appendElementsUnique(
CommandHelpers::filterCommandReplyForPassthrough(response.data));
}
} findAndModifyCmd;
} // namespace
} // namespace mongo
|