-
Notifications
You must be signed in to change notification settings - Fork 15
/
amqpprox_session.h
435 lines (381 loc) · 14.9 KB
/
amqpprox_session.h
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
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
/*
** Copyright 2020 Bloomberg Finance L.P.
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#ifndef BLOOMBERG_AMQPPROX_SESSION
#define BLOOMBERG_AMQPPROX_SESSION
#include <amqpprox_authinterceptinterface.h>
#include <amqpprox_backend.h>
#include <amqpprox_buffer.h>
#include <amqpprox_bufferhandle.h>
#include <amqpprox_bufferpool.h>
#include <amqpprox_connectionselectorinterface.h>
#include <amqpprox_connector.h>
#include <amqpprox_fieldtable.h>
#include <amqpprox_flowtype.h>
#include <amqpprox_frame.h>
#include <amqpprox_maybesecuresocketadaptor.h>
#include <amqpprox_sessionstate.h>
#include <boost/asio.hpp>
#include <boost/asio/steady_timer.hpp>
#include <chrono>
#include <iosfwd>
#include <memory>
#include <string>
#include <string_view>
#include <vector>
namespace Bloomberg {
namespace amqpprox {
class ConnectionManager;
class ConnectionSelectorInterface;
class EventSource;
class DNSResolver;
class DataRateLimitManager;
/**
* \brief Binds the incoming and outgoing sockets into a channel through the
* proxy.
*
* This component provides the 'pumping' of data through the proxy for a
* particular session between one incoming connection and one outgoing
* connection (once the handshake has completed).
*/
class Session : public std::enable_shared_from_this<Session> {
private:
using TimePoint =
std::chrono::time_point<std::chrono::high_resolution_clock>;
boost::asio::io_context &d_ioContext;
std::shared_ptr<MaybeSecureSocketAdaptor<>> d_serverSocket;
std::shared_ptr<MaybeSecureSocketAdaptor<>> d_clientSocket;
BufferHandle d_serverDataHandle;
BufferHandle d_serverWriteDataHandle;
BufferHandle d_clientDataHandle;
BufferHandle d_clientWriteDataHandle;
std::size_t d_serverWaterMark;
std::size_t d_clientWaterMark;
SessionState d_sessionState;
Connector d_connector;
ConnectionSelectorInterface *d_connectionSelector_p; // HELD NOT OWNED
EventSource *d_eventSource_p; // HELD NOT OWNED
BufferPool *d_bufferPool_p; // HELD NOT OWNED
DNSResolver *d_dnsResolver_p;
TimePoint d_ingressWaitingSince;
TimePoint d_egressWaitingSince;
uint32_t d_egressRetryCounter;
bool d_ingressCurrentlyReading;
TimePoint d_ingressStartedAt;
bool d_egressCurrentlyReading;
TimePoint d_egressStartedAt;
std::vector<boost::asio::ip::tcp::endpoint> d_resolvedEndpoints;
uint32_t d_resolvedEndpointsIndex;
boost::asio::steady_timer d_connectionRateLimitedTimer;
std::shared_ptr<AuthInterceptInterface> d_authIntercept;
DataRateLimitManager *d_limitManager; // HELD NOT OWNED
public:
// CREATORS
Session(boost::asio::io_context &ioContext,
const std::shared_ptr<MaybeSecureSocketAdaptor<>> &serverSocket,
const std::shared_ptr<MaybeSecureSocketAdaptor<>> &clientSocket,
ConnectionSelectorInterface *connectionSelector,
EventSource *eventSource,
BufferPool *bufferPool,
DNSResolver *dnsResolver,
const std::shared_ptr<HostnameMapper> &hostnameMapper,
std::string_view localHostname,
const std::shared_ptr<AuthInterceptInterface> &authIntercept,
bool isIngressSecure,
DataRateLimitManager *limitManager);
~Session();
// MANIPULATORS
/**
* \brief Start the session and read the new socket for the protocol header
*/
void start();
/**
* \brief Print the session information
* \param os output stream object
*/
void print(std::ostream &os);
/**
* \brief Pause all IO operations on the session
*/
void pause();
/**
* \brief Un-pause this session. This will disconnect the session if it was
* connected to the broker when paused. If the session was paused during
* the handshake this may in future continue the handshake.
*/
void unpause();
/**
* \brief Disconnect both sides of the session
* \param forcible to specify forcefully disconnect
*/
void disconnect(bool forcible);
/**
* \brief Disconnect unauthorized client side connection, if client sets
* 'authentication_failure_close' capability to true in AMQP START-OK
* connection method; otherwise snap the socket for client side connection.
* And snap the socket for server side connection.
* https://www.rabbitmq.com/auth-notification.html
* \param clientProperties will be used to find the client
* 'authentication_failure_close' capability value
* \param reason custom reason/message for unauthorized client
*/
void disconnectUnauthClient(const FieldTable &clientProperties,
std::string_view reason);
/**
* \brief Disconnect the session from the backend, but leave the client
* connected.
*/
void backendDisconnect();
/**
* \return the state object for the session
*/
SessionState &state();
// ACCESSORS
/**
* \return the threadsafe state object for the session
*/
const SessionState &state() const;
/**
* \return true if the session is disconnected and should be
* elligible to be deleted.
*/
bool finished();
/**
* \brief Give proxy protocol header for the given backend
* \param currentBackend pointer to `Backend`
* \return proxy protocol header
*/
std::string getProxyProtocolHeader(const Backend *currentBackend);
/**
* Set data rate thresholds (alarm and otherwise) for the server socket.
* This will take into account the latest limit values
**/
void updateDataRateLimits();
private:
/**
* \brief Attempt next connection from the list managed by the specified
* `ConnectionManager` object.
* \param connectionManager shared pointer to `ConnectionManager`
*/
void attemptConnection(
const std::shared_ptr<ConnectionManager> &connectionManager);
/**
* \brief Second stage of attempting a connection with a list of resolved
* endpoints.
* \param connectionManager shared pointer to `ConnectionManager`
*/
void attemptResolvedConnection(
const std::shared_ptr<ConnectionManager> &connectionManager);
/**
* \brief Third stage of attempting a connection with a fully resolved
* IP+port
* \param endpoint peer endpoint to be connected with
*/
void attemptEndpointConnection(
boost::asio::ip::tcp::endpoint endpoint,
const std::shared_ptr<ConnectionManager> &connectionManager);
/**
* \brief Start establishing a connection for this incoming session
*/
void establishConnection();
/**
* \brief Send data stored in connector's buffer and originated on the
* proxy side
*/
void sendSyntheticData();
/**
* \brief Handle the incoming data that's been received
* \param direction specifies direction of the data flow (ingress/egress)
*/
void handleData(FlowType direction);
/**
* \brief Read more data into the session
* \param direction specifies direction of the data flow (ingress/egress)
*/
void readData(FlowType direction);
/**
* \brief Put the supplied data onto the outgoing socket, then re-read
* \param direction specifies direction of the data flow (ingress/egress)
* \param writeSocket to write the data
* \param data to be written onto the outgoing socket
*/
void handleWriteData(FlowType direction,
MaybeSecureSocketAdaptor<> &writeSocket,
Buffer data);
/**
* \brief Handle errors on an established connection
* \param action specifies action information
* \param direction specifies direction of the data flow (ingress/egress)
* \param ec specifies error code
*/
void handleSessionError(const char *action,
FlowType direction,
boost::system::error_code ec);
/**
* \brief Handle errors while establishing a connection
* \param action specifies action information
* \param ec specifies error code
* \param connectionManager shared pointer to `ConnectionManager`
*/
void handleConnectionError(
const char *action,
boost::system::error_code ec,
const std::shared_ptr<ConnectionManager> &connectionManager);
/**
* \brief Disconnect both sockets forcibly
*/
void performDisconnectBoth();
/**
* \brief Copy any remaining data from the incoming buffer to a new buffer
* for the next read operation to append to.
* \param direction specifies direction of the data flow (ingress/egress)
* \param remaining specifies remaining buffer data
*/
inline void copyRemaining(FlowType direction, const Buffer &remaining);
/**
* \param direction specifies direction of the data flow (ingress/egress)
* \return a mutable reference to the socket to read from
*/
inline MaybeSecureSocketAdaptor<> &readSocket(FlowType direction);
/**
* \param direction specifies direction of the data flow (ingress/egress)
* \return a buffer to used for reading into
*/
inline Buffer readBuffer(FlowType direction);
/**
* \param direction specifies direction of the data flow (ingress/egress)
* \return a mutable reference to the amount of data already in the read
* buffer
*/
inline std::size_t &waterMark(FlowType direction);
/**
* \param direction specifies direction of the data flow (ingress/egress)
* \return a mutable reference to the time we last saw traffic
*/
inline TimePoint &timePoint(FlowType direction);
/**
* \param direction specifies direction of the data flow (ingress/egress)
* \return a mutable reference to the ownership handle of the primary
* buffer
*/
inline BufferHandle &bufferHandle(FlowType direction);
/**
* \param direction specifies direction of the data flow (ingress/egress)
* \return a mutable reference to the ownership handle of the secondary
* buffer
*/
inline BufferHandle &bufferWriteDataHandle(FlowType direction);
/**
* \param direction specifies direction of the data flow (ingress/egress)
* \return a mutable reference to the time when the last read started
*/
inline Session::TimePoint &startedAt(FlowType direction);
/**
* \param direction specifies direction of the data flow (ingress/egress)
* \return a mutable reference to whether we are currently reading a
* message off the wire or not.
*/
inline bool ¤tlyReading(FlowType direction);
};
inline MaybeSecureSocketAdaptor<> &Session::readSocket(FlowType direction)
{
return (direction == FlowType::INGRESS) ? *d_serverSocket
: *d_clientSocket;
}
inline void Session::copyRemaining(FlowType direction, const Buffer &remaining)
{
if (direction == FlowType::INGRESS) {
if (remaining.size()) {
d_serverWaterMark = remaining.size();
d_serverWriteDataHandle.swap(d_serverDataHandle);
d_bufferPool_p->acquireBuffer(
&d_serverDataHandle,
std::max(d_serverWaterMark, Frame::getMaxFrameSize()));
memcpy(
d_serverDataHandle.data(), remaining.ptr(), d_serverWaterMark);
}
else {
d_serverWaterMark = 0;
}
}
else {
if (remaining.size()) {
d_clientWaterMark = remaining.size();
d_clientWriteDataHandle.swap(d_clientDataHandle);
d_bufferPool_p->acquireBuffer(
&d_clientDataHandle,
std::max(d_clientWaterMark, Frame::getMaxFrameSize()));
memcpy(
d_clientDataHandle.data(), remaining.ptr(), d_clientWaterMark);
}
else {
d_clientWaterMark = 0;
}
}
}
inline Buffer Session::readBuffer(FlowType direction)
{
if (direction == FlowType::INGRESS) {
Buffer readBuf(d_serverDataHandle.data(), d_serverDataHandle.size());
readBuf.seek(d_serverWaterMark);
return readBuf;
}
else {
Buffer readBuf(d_clientDataHandle.data(), d_clientDataHandle.size());
readBuf.seek(d_clientWaterMark);
return readBuf;
}
}
inline SessionState &Session::state()
{
return d_sessionState;
}
inline const SessionState &Session::state() const
{
return d_sessionState;
}
inline std::size_t &Session::waterMark(FlowType direction)
{
return direction == FlowType::INGRESS ? d_serverWaterMark
: d_clientWaterMark;
}
inline Session::TimePoint &Session::timePoint(FlowType direction)
{
return direction == FlowType::INGRESS ? d_ingressWaitingSince
: d_egressWaitingSince;
}
inline BufferHandle &Session::bufferHandle(FlowType direction)
{
return direction == FlowType::INGRESS ? d_serverDataHandle
: d_clientDataHandle;
}
inline BufferHandle &Session::bufferWriteDataHandle(FlowType direction)
{
return direction == FlowType::INGRESS ? d_serverWriteDataHandle
: d_clientWriteDataHandle;
}
inline Session::TimePoint &Session::startedAt(FlowType direction)
{
return direction == FlowType::INGRESS ? d_ingressStartedAt
: d_egressStartedAt;
}
inline bool &Session::currentlyReading(FlowType direction)
{
return direction == FlowType::INGRESS ? d_ingressCurrentlyReading
: d_egressCurrentlyReading;
}
}
}
#endif