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
|
/**
* 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/db/auth/authorization_session.h"
#include "mongo/db/commands.h"
#include "mongo/db/commands/run_aggregate.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/pipeline/aggregate_command_gen.h"
#include "mongo/db/pipeline/aggregation_request_helper.h"
#include "mongo/db/pipeline/lite_parsed_pipeline.h"
#include "mongo/db/pipeline/pipeline.h"
namespace mongo {
namespace {
class PipelineCommand final : public Command {
public:
PipelineCommand() : Command("aggregate") {}
const std::set<std::string>& apiVersions() const {
return kApiVersions1;
}
/**
* It's not known until after parsing whether or not an aggregation command is an explain
* request, because it might include the `explain: true` field (ie. aggregation explains do not
* need to arrive via the `explain` command). Therefore even parsing of regular aggregation
* commands needs to be able to handle the explain case.
*
* As a result, aggregation command parsing is done in parseForExplain():
*
* - To parse a regular aggregation command, call parseForExplain() with `explainVerbosity` of
* boost::none.
*
* - To parse an aggregation command as the sub-command in an `explain` command, call
* parseForExplain() with `explainVerbosity` set to the desired verbosity.
*/
std::unique_ptr<CommandInvocation> parse(OperationContext* opCtx,
const OpMsgRequest& opMsgRequest) override {
return parseForExplain(opCtx, opMsgRequest, boost::none);
}
std::unique_ptr<CommandInvocation> parseForExplain(
OperationContext* opCtx,
const OpMsgRequest& opMsgRequest,
boost::optional<ExplainOptions::Verbosity> explainVerbosity) override {
const auto aggregationRequest = uassertStatusOK(aggregation_request_helper::parseFromBSON(
opMsgRequest.getDatabase().toString(), opMsgRequest.body, explainVerbosity));
auto privileges =
uassertStatusOK(AuthorizationSession::get(opCtx->getClient())
->getPrivilegesForAggregate(
aggregationRequest.getNamespace(), aggregationRequest, false));
return std::make_unique<Invocation>(
this, opMsgRequest, std::move(aggregationRequest), std::move(privileges));
}
bool shouldAffectReadConcernCounter() const override {
return true;
}
bool collectsResourceConsumptionMetrics() const override {
return true;
}
class Invocation final : public CommandInvocation {
public:
Invocation(Command* cmd,
const OpMsgRequest& request,
const AggregateCommand aggregationRequest,
PrivilegeVector privileges)
: CommandInvocation(cmd),
_request(request),
_dbName(request.getDatabase().toString()),
_aggregationRequest(std::move(aggregationRequest)),
_liteParsedPipeline(_aggregationRequest),
_privileges(std::move(privileges)) {}
private:
bool supportsWriteConcern() const override {
return true;
}
bool canIgnorePrepareConflicts() const override {
// Aggregate is a special case for prepare conflicts. It may do writes to an output
// collection, but it enables enforcement of prepare conflicts before doing so.
return true;
}
ReadConcernSupportResult supportsReadConcern(repl::ReadConcernLevel level) const override {
return _liteParsedPipeline.supportsReadConcern(
level,
_aggregationRequest.getExplain(),
serverGlobalParams.enableMajorityReadConcern);
}
bool allowsSpeculativeMajorityReads() const override {
// Currently only change stream aggregation queries are allowed to use speculative
// majority. The aggregation command itself will check this internally and fail if
// necessary.
return true;
}
void run(OperationContext* opCtx, rpc::ReplyBuilderInterface* reply) override {
CommandHelpers::handleMarkKillOnClientDisconnect(
opCtx, !Pipeline::aggHasWriteStage(_request.body));
uassertStatusOK(runAggregate(opCtx,
_aggregationRequest.getNamespace(),
_aggregationRequest,
_liteParsedPipeline,
_request.body,
_privileges,
reply));
}
NamespaceString ns() const override {
return _aggregationRequest.getNamespace();
}
void explain(OperationContext* opCtx,
ExplainOptions::Verbosity verbosity,
rpc::ReplyBuilderInterface* result) override {
uassertStatusOK(runAggregate(opCtx,
_aggregationRequest.getNamespace(),
_aggregationRequest,
_liteParsedPipeline,
_request.body,
_privileges,
result));
}
void doCheckAuthorization(OperationContext* opCtx) const override {
uassert(ErrorCodes::Unauthorized,
"unauthorized",
AuthorizationSession::get(opCtx->getClient())
->isAuthorizedForPrivileges(_privileges));
}
const OpMsgRequest& _request;
const std::string _dbName;
const AggregateCommand _aggregationRequest;
const LiteParsedPipeline _liteParsedPipeline;
const PrivilegeVector _privileges;
};
std::string help() const override {
return "Runs the aggregation command. See http://dochub.mongodb.org/core/aggregation for "
"more details.";
}
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kOptIn;
}
bool maintenanceOk() const override {
return false;
}
ReadWriteType getReadWriteType() const {
return ReadWriteType::kRead;
}
} pipelineCmd;
} // namespace
} // namespace mongo
|
