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
|
/**
* 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 <functional>
#include <string>
#include "mongo/base/status_with.h"
#include "mongo/config.h"
#include "mongo/db/server_options.h"
#include "mongo/stdx/condition_variable.h"
#include "mongo/stdx/memory.h"
#include "mongo/stdx/mutex.h"
#include "mongo/stdx/thread.h"
#include "mongo/transport/transport_layer.h"
#include "mongo/transport/transport_mode.h"
#include "mongo/util/fail_point_service.h"
#include "mongo/util/net/hostandport.h"
#include "mongo/util/net/ssl_options.h"
#include "mongo/util/net/ssl_types.h"
namespace asio {
class io_context;
template <typename Protocol>
class basic_socket_acceptor;
namespace generic {
class stream_protocol;
} // namespace generic
namespace ssl {
class context;
} // namespace ssl
} // namespace asio
namespace mongo {
class ServiceContext;
class ServiceEntryPoint;
namespace transport {
// This fail point simulates reads and writes that always return 1 byte and fail with EAGAIN
MONGO_FAIL_POINT_DECLARE(transportLayerASIOshortOpportunisticReadWrite);
// This fail point will cause an asyncConnect to timeout after it's successfully connected
// to the remote peer
MONGO_FAIL_POINT_DECLARE(transportLayerASIOasyncConnectTimesOut);
/**
* A TransportLayer implementation based on ASIO networking primitives.
*/
class TransportLayerASIO final : public TransportLayer {
MONGO_DISALLOW_COPYING(TransportLayerASIO);
public:
struct Options {
constexpr static auto kIngress = 0x1;
constexpr static auto kEgress = 0x10;
explicit Options(const ServerGlobalParams* params);
Options() = default;
int mode = kIngress | kEgress;
bool isIngress() const {
return mode & kIngress;
}
bool isEgress() const {
return mode & kEgress;
}
int port = ServerGlobalParams::DefaultDBPort; // port to bind to
std::vector<std::string> ipList; // addresses to bind to
#ifndef _WIN32
bool useUnixSockets = true; // whether to allow UNIX sockets in ipList
#endif
bool enableIPv6 = false; // whether to allow IPv6 sockets in ipList
Mode transportMode = Mode::kSynchronous; // whether accepted sockets should be put into
// non-blocking mode after they're accepted
size_t maxConns = DEFAULT_MAX_CONN; // maximum number of active connections
};
TransportLayerASIO(const Options& opts, ServiceEntryPoint* sep);
virtual ~TransportLayerASIO();
StatusWith<SessionHandle> connect(HostAndPort peer,
ConnectSSLMode sslMode,
Milliseconds timeout) final;
Future<SessionHandle> asyncConnect(HostAndPort peer,
ConnectSSLMode sslMode,
const ReactorHandle& reactor,
Milliseconds timeout) final;
Status setup() final;
ReactorHandle getReactor(WhichReactor which) final;
Status start() final;
void shutdown() final;
int listenerPort() const {
return _listenerPort;
}
#ifdef __linux__
BatonHandle makeBaton(OperationContext* opCtx) const override;
#endif
private:
class BatonASIO;
class ASIOSession;
class ASIOReactor;
using ASIOSessionHandle = std::shared_ptr<ASIOSession>;
using ConstASIOSessionHandle = std::shared_ptr<const ASIOSession>;
using GenericAcceptor = asio::basic_socket_acceptor<asio::generic::stream_protocol>;
void _acceptConnection(GenericAcceptor& acceptor);
template <typename Endpoint>
StatusWith<ASIOSessionHandle> _doSyncConnect(Endpoint endpoint,
const HostAndPort& peer,
const Milliseconds& timeout);
#ifdef MONGO_CONFIG_SSL
SSLParams::SSLModes _sslMode() const;
#endif
stdx::mutex _mutex;
// There are three reactors that are used by TransportLayerASIO. The _ingressReactor contains
// all the accepted sockets and all ingress networking activity. The _acceptorReactor contains
// all the sockets in _acceptors. The _egressReactor contains egress connections.
//
// TransportLayerASIO should never call run() on the _ingressReactor.
// In synchronous mode, this will cause a massive performance degradation due to
// unnecessary wakeups on the asio thread for sockets we don't intend to interact
// with asynchronously. The additional IO context avoids registering those sockets
// with the acceptors epoll set, thus avoiding those wakeups. Calling run will
// undo that benefit.
//
// TransportLayerASIO should run its own thread that calls run() on the _acceptorReactor
// to process calls to async_accept - this is the equivalent of the "listener" thread in
// other TransportLayers.
//
// The underlying problem that caused this is here:
// https://github.com/chriskohlhoff/asio/issues/240
//
// It is important that the reactors be declared before the vector of acceptors (or any other
// state that is associated with the reactors), so that we destroy any existing acceptors or
// other reactor associated state before we drop the refcount on the reactor, which may destroy
// it.
std::shared_ptr<ASIOReactor> _ingressReactor;
std::shared_ptr<ASIOReactor> _egressReactor;
std::shared_ptr<ASIOReactor> _acceptorReactor;
#ifdef MONGO_CONFIG_SSL
std::unique_ptr<asio::ssl::context> _ingressSSLContext;
std::unique_ptr<asio::ssl::context> _egressSSLContext;
#endif
std::vector<std::pair<SockAddr, GenericAcceptor>> _acceptors;
// Only used if _listenerOptions.async is false.
stdx::thread _listenerThread;
ServiceEntryPoint* const _sep = nullptr;
AtomicWord<bool> _running{false};
Options _listenerOptions;
// The real incoming port in case of _listenerOptions.port==0 (ephemeral).
int _listenerPort = 0;
};
} // namespace transport
} // namespace mongo
|