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
|
/**
* Copyright (C) 2015 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.
*/
#pragma once
#include <asio.hpp>
#include <atomic>
#include <system_error>
#include <thread>
#include <unordered_map>
#include "mongo/client/connection_pool.h"
#include "mongo/client/remote_command_runner.h"
#include "mongo/executor/network_interface.h"
#include "mongo/platform/atomic_word.h"
#include "mongo/stdx/condition_variable.h"
#include "mongo/stdx/mutex.h"
#include "mongo/util/net/message.h"
namespace mongo {
namespace executor {
/**
* Implementation of the replication system's network interface using Christopher
* Kohlhoff's ASIO library instead of existing MongoDB networking primitives.
*/
class NetworkInterfaceASIO final : public NetworkInterface {
public:
NetworkInterfaceASIO();
std::string getDiagnosticString() override;
void startup() override;
void shutdown() override;
void waitForWork() override;
void waitForWorkUntil(Date_t when) override;
void signalWorkAvailable() override;
Date_t now() override;
void startCommand(const TaskExecutor::CallbackHandle& cbHandle,
const RemoteCommandRequest& request,
const RemoteCommandCompletionFn& onFinish) override;
void cancelCommand(const TaskExecutor::CallbackHandle& cbHandle) override;
bool inShutdown() const;
private:
enum class State { kReady, kRunning, kShutdown };
/**
* Helper object to manage individual network operations.
*/
class AsyncOp {
public:
AsyncOp(const TaskExecutor::CallbackHandle& cbHandle,
const RemoteCommandRequest& request,
const RemoteCommandCompletionFn& onFinish,
Date_t now,
int id);
std::string toString() const;
void cancel();
bool canceled() const;
const TaskExecutor::CallbackHandle& cbHandle() const;
void complete(Date_t now);
void connect(ConnectionPool* const pool, asio::io_service* service, Date_t now);
bool connected() const;
void finish(const TaskExecutor::ResponseStatus& status);
MSGHEADER::Value* header();
const RemoteCommandRequest& request() const;
void setOutput(const BSONObj& bson);
asio::ip::tcp::socket* sock();
Date_t start() const;
Message* toSend();
Message* toRecv();
private:
enum class OpState {
kReady,
kConnectionAcquired,
kConnectionVerified,
kConnected,
kCompleted
};
// Information describing an in-flight command.
TaskExecutor::CallbackHandle _cbHandle;
RemoteCommandRequest _request;
RemoteCommandCompletionFn _onFinish;
const Date_t _start;
OpState _state;
AtomicUInt64 _canceled;
std::unique_ptr<ConnectionPool::ConnectionPtr> _conn;
std::unique_ptr<asio::ip::tcp::socket> _sock;
Message _toSend;
Message _toRecv;
MSGHEADER::Value _header;
BSONObj _output;
const int _id;
};
void _messageFromRequest(const RemoteCommandRequest& request,
Message* toSend,
bool useOpCommand = false);
void _asyncSendSimpleMessage(AsyncOp* op, const asio::const_buffer& buf);
void _completedWriteCallback(AsyncOp* op);
void _networkErrorCallback(AsyncOp* op, const std::error_code& ec);
void _completeOperation(AsyncOp* op);
void _keepAlive(AsyncOp* op);
void _recvMessageHeader(AsyncOp* op);
void _recvMessageBody(AsyncOp* op);
void _receiveResponse(AsyncOp* op);
void _signalWorkAvailable_inlock();
asio::io_service _io_service;
stdx::thread _serviceRunner;
std::atomic<State> _state;
stdx::mutex _inProgressMutex;
std::unordered_map<AsyncOp*, std::unique_ptr<AsyncOp>> _inProgress;
stdx::mutex _executorMutex;
bool _isExecutorRunnable;
stdx::condition_variable _isExecutorRunnableCondition;
std::unique_ptr<ConnectionPool> _connPool;
AtomicUInt64 _numOps;
};
} // namespace executor
} // namespace mongo
|
