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
|
/**
* 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.
*/
#pragma once
#include "mongo/db/jsobj.h"
#include "mongo/db/operation_context.h"
namespace mongo {
class BSONObj;
class BSONObjBuilder;
namespace rpc {
/**
* This class encapsulates the metadata sent on every command request and response,
* containing data to track command execution. The current implementation only applies to commands
* that go through ShardRemote, which is most sharding catalog operations. It excludes the entire
* replication subsystem, query-type client commands, and write-type client commands.
*
* format:
* tracking_info: {
* operId: ObjectId("") // unique ID for the current operation
* operName: string // command name of the current operation
* parentOperId: string // '|' separated chain of the ancestor commands, oldest first
* }
*/
class TrackingMetadata {
public:
static const OperationContext::Decoration<TrackingMetadata> get;
TrackingMetadata() = default;
explicit TrackingMetadata(OID operId, std::string operName);
explicit TrackingMetadata(OID operId, std::string operName, std::string parentOperId);
/**
* Parses the metadata from the given metadata object.
* Returns a NoSuchKey error status if it does not have operId or operName set.
* Returns a TypeMismatch error if operId is not OID and operName or parentOperId are not String
* If no metadata is found, returns a default-constructed TrackingMetadata.
*/
static StatusWith<TrackingMetadata> readFromMetadata(const BSONObj& metadataObj);
/**
* Parses TrackingMetadata from a pre-extracted BSONElement. When reading a metadata object,
* this form is more efficient as it permits parsing the metadata in one pass.
*/
static StatusWith<TrackingMetadata> readFromMetadata(const BSONElement& metadataElem);
/**
* Writes the metadata to the given BSONObjBuilder for building a command request or response
* metadata. Only valid to call if operId and operName are set.
*/
void writeToMetadata(BSONObjBuilder* builder) const;
/**
* Returns the Id of this operation.
*/
boost::optional<OID> getOperId() const {
return _operId;
}
/**
* Returns the name of this operation.
*/
boost::optional<std::string> getOperName() const {
return _operName;
}
/**
* Returns the parent operId of this operation.
*/
boost::optional<std::string> getParentOperId() const {
return _parentOperId;
}
static StringData fieldName() {
return "tracking_info";
}
/**
* Sets operName to name argument. Intended to initialize the metadata when command name is
* known.
*/
void initWithOperName(const std::string& name);
/*
* get|set isLogged are used to avoid logging parent metadata more than once.
*/
bool getIsLogged() const {
return _isLogged;
}
void setIsLogged(bool isLogged) {
_isLogged = isLogged;
}
/*
* Builds metadata for child command by updating parentOperId with current operId and
* setting operId to a new value.
*/
TrackingMetadata constructChildMetadata() const;
std::string toString() const;
static BSONObj removeTrackingData(BSONObj metadata);
private:
boost::optional<OID> _operId;
boost::optional<std::string> _operName;
boost::optional<std::string> _parentOperId;
bool _isLogged{false};
};
} // namespace rpc
} // namespace mongo
|
