summaryrefslogtreecommitdiff
path: root/src/mongo/db/commands/map_reduce_out_options.cpp
blob: 6c53741f03257f31cb522fd8aebfb5502e098af4 (plain)
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
/**
 *    Copyright (C) 2019-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_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kCommand

#include <string>
#include <utility>

#include "mongo/db/commands/map_reduce_out_options.h"
#include "mongo/db/namespace_string.h"
#include "mongo/logv2/log.h"

namespace mongo {

using namespace std::string_literals;

// Used to occasionally log deprecation messages.
Rarely shardedDeprecationSampler;

MapReduceOutOptions MapReduceOutOptions::parseFromBSON(const BSONElement& element) {
    if (element.type() == BSONType::String) {
        return MapReduceOutOptions(boost::none, element.str(), OutputType::Replace, false);
    } else if (element.type() == BSONType::Object) {
        const auto obj = element.embeddedObject();
        // The inline option is allowed alone.
        if (const auto inMemory = obj["inline"]) {
            uassert(
                ErrorCodes::InvalidOptions, "'inline' must be specified alone", obj.nFields() == 1);
            uassert(
                ErrorCodes::BadValue, "'inline' takes only numeric '1'", inMemory.number() == 1.0);

            return MapReduceOutOptions(boost::none, "", OutputType::InMemory, false);
        }

        int allowedNFields = 4;

        const auto sharded = [&]() {
            if (const auto sharded = obj["sharded"]) {
                uassert(ErrorCodes::BadValue,
                        "sharded field value must be boolean",
                        sharded.type() == Bool);
                uassert(
                    ErrorCodes::BadValue, "sharded field value must be true", sharded.boolean());
                if (shardedDeprecationSampler.tick()) {
                    LOGV2_WARNING(23703, "The out.sharded option in MapReduce is deprecated");
                }
                return true;
            } else {
                --allowedNFields;
                return false;
            }
        }();

        const auto [collectionName, outputType] = [&]() {
            auto stringOrError = [](auto&& element) {
                uassert(ErrorCodes::BadValue,
                        "'"s + element.fieldName() +
                            "' supports only string consisting of output collection name",
                        element.type() == BSONType::String);
                return element.str();
            };
            if (const auto replace = obj["replace"])
                return std::pair{stringOrError(replace), OutputType::Replace};
            else if (const auto merge = obj["merge"])
                return std::pair{stringOrError(merge), OutputType::Merge};
            else if (const auto reduce = obj["reduce"])
                return std::pair{stringOrError(reduce), OutputType::Reduce};
            else
                uasserted(ErrorCodes::BadValue, "'out' requires 'replace', 'merge' or 'reduce'");
        }();

        const auto databaseName =
            [&, &collectionName = collectionName]() -> boost::optional<std::string> {
            if (const auto db = obj["db"]) {
                uassert(ErrorCodes::BadValue,
                        "db field value must be string",
                        db.type() == BSONType::String);
                uassert(ErrorCodes::CommandNotSupported,
                        "cannot target internal database as output",
                        !(NamespaceString(db.valueStringData(), collectionName).isOnInternalDb()));
                return boost::make_optional(db.str());
            } else {
                --allowedNFields;
                return boost::none;
            }
        }();

        if (const auto nonAtomic = obj["nonAtomic"]) {
            uassert(ErrorCodes::BadValue,
                    "nonAtomic field value must be boolean",
                    nonAtomic.type() == Bool);
            uassert(
                ErrorCodes::BadValue, "nonAtomic field value must be true", nonAtomic.boolean());
        } else {
            --allowedNFields;
        }

        uassert(ErrorCodes::BadValue,
                "'out' supports only output type with collection name, optional 'sharded' and "
                "optional 'db'",
                obj.nFields() == allowedNFields);

        return MapReduceOutOptions(
            std::move(databaseName), std::move(collectionName), outputType, sharded);
    } else {
        uasserted(ErrorCodes::BadValue, "'out' must be either a string or an object");
    }
}

}  // namespace mongo