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
|
/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*
*/
#include "qpid/sys/AsynchIOHandler.h"
#include "qpid/sys/AsynchIO.h"
#include "qpid/sys/Socket.h"
#include "qpid/sys/SecuritySettings.h"
#include "qpid/sys/Timer.h"
#include "qpid/framing/AMQP_HighestVersion.h"
#include "qpid/framing/ProtocolInitiation.h"
#include "qpid/log/Statement.h"
#include <boost/bind.hpp>
namespace qpid {
namespace sys {
struct ProtocolTimeoutTask : public sys::TimerTask {
AsynchIOHandler& handler;
std::string id;
ProtocolTimeoutTask(const std::string& i, const Duration& timeout, AsynchIOHandler& h) :
TimerTask(timeout, "ProtocolTimeout"),
handler(h),
id(i)
{}
void fire() {
// If this fires it means that we didn't negotiate the connection in the timeout period
// Schedule closing the connection for the io thread
QPID_LOG(error, "Connection " << id << " No protocol received closing");
handler.abort();
}
};
AsynchIOHandler::AsynchIOHandler(const std::string& id, ConnectionCodec::Factory* f, bool isClient0, bool nodict0) :
identifier(id),
aio(0),
factory(f),
codec(0),
reads(0),
readError(false),
isClient(isClient0),
nodict(nodict0)
{}
AsynchIOHandler::~AsynchIOHandler() {
if (codec)
codec->closed();
if (timeoutTimerTask)
timeoutTimerTask->cancel();
delete codec;
}
void AsynchIOHandler::init(qpid::sys::AsynchIO* a, qpid::sys::Timer& timer, uint32_t maxTime) {
aio = a;
// Start timer for this connection
timeoutTimerTask = new ProtocolTimeoutTask(identifier, maxTime*TIME_MSEC, *this);
timer.add(timeoutTimerTask);
// Give connection some buffers to use
aio->createBuffers();
}
void AsynchIOHandler::write(const framing::ProtocolInitiation& data)
{
QPID_LOG(debug, "SENT [" << identifier << "]: INIT(" << data << ")");
AsynchIO::BufferBase* buff = aio->getQueuedBuffer();
assert(buff);
framing::Buffer out(buff->bytes, buff->byteCount);
data.encode(out);
buff->dataCount = data.encodedSize();
aio->queueWrite(buff);
}
void AsynchIOHandler::abort() {
// Don't disconnect if we're already disconnecting
if (!readError) {
aio->requestCallback(boost::bind(&AsynchIOHandler::eof, this, _1));
}
aio->queueWriteClose();
}
void AsynchIOHandler::activateOutput() {
aio->notifyPendingWrite();
}
namespace {
SecuritySettings getSecuritySettings(AsynchIO* aio, bool nodict)
{
SecuritySettings settings = aio->getSecuritySettings();
settings.nodict = nodict;
return settings;
}
}
void AsynchIOHandler::readbuff(AsynchIO& , AsynchIO::BufferBase* buff) {
if (readError) {
return;
}
++reads;
size_t decoded = 0;
if (codec) { // Already initiated
try {
decoded = codec->decode(buff->bytes+buff->dataStart, buff->dataCount);
// When we've decoded 3 reads (probably frames) we will have authenticated and
// started heartbeats, if specified, in many (but not all) cases so now we will cancel
// the idle connection timeout - this is really hacky, and would be better implemented
// in the connection, but that isn't actually created until the first decode.
if (reads == 3) {
timeoutTimerTask->cancel();
}
}catch(const std::exception& e){
QPID_LOG(error, e.what());
readError = true;
aio->queueWriteClose();
}
}else{
framing::Buffer in(buff->bytes+buff->dataStart, buff->dataCount);
framing::ProtocolInitiation protocolInit;
if (protocolInit.decode(in)) {
decoded = in.getPosition();
QPID_LOG(debug, "RECV [" << identifier << "]: INIT(" << protocolInit << ")");
try {
codec = factory->create(protocolInit.getVersion(), *this, identifier, getSecuritySettings(aio, nodict));
if (!codec) {
//TODO: may still want to revise this...
//send valid version header & close connection.
write(framing::ProtocolInitiation(framing::highestProtocolVersion));
readError = true;
aio->queueWriteClose();
} else {
//read any further data that may already have been sent
decoded += codec->decode(buff->bytes+buff->dataStart+in.getPosition(), buff->dataCount-in.getPosition());
}
} catch (const std::exception& e) {
QPID_LOG(error, e.what());
readError = true;
aio->queueWriteClose();
}
}
}
// TODO: unreading needs to go away, and when we can cope
// with multiple sub-buffers in the general buffer scheme, it will
if (decoded != size_t(buff->dataCount)) {
// Adjust buffer for used bytes and then "unread them"
buff->dataStart += decoded;
buff->dataCount -= decoded;
aio->unread(buff);
} else {
// Give whole buffer back to aio subsystem
aio->queueReadBuffer(buff);
}
}
void AsynchIOHandler::eof(AsynchIO& a) {
disconnect(a);
readError = true;
aio->queueWriteClose();
}
void AsynchIOHandler::closedSocket(AsynchIO&, const Socket& s) {
// If we closed with data still to send log a warning
if (!aio->writeQueueEmpty()) {
QPID_LOG(warning, "CLOSING [" << identifier << "] unsent data (probably due to client disconnect)");
}
delete &s;
aio->queueForDeletion();
delete this;
}
void AsynchIOHandler::disconnect(AsynchIO&) {
QPID_LOG(debug, "DISCONNECTED [" << identifier << "]");
if (codec) codec->closed();
}
// Notifications
void AsynchIOHandler::nobuffs(AsynchIO&) {
}
void AsynchIOHandler::idle(AsynchIO&){
if (isClient && codec == 0) {
codec = factory->create(*this, identifier, getSecuritySettings(aio, nodict));
write(framing::ProtocolInitiation(codec->getVersion()));
// We've just sent the protocol negotiation so we can cancel the timeout for that
// This is not ideal, because we've not received anything yet, but heartbeats will
// be active soon
timeoutTimerTask->cancel();
return;
}
if (codec == 0) return;
if (!codec->canEncode()) {
return;
}
AsynchIO::BufferBase* buff = aio->getQueuedBuffer();
if (buff) {
try {
size_t encoded=codec->encode(buff->bytes, buff->byteCount);
buff->dataCount = encoded;
aio->queueWrite(buff);
if (!codec->isClosed()) {
return;
}
} catch (const std::exception& e) {
QPID_LOG(error, e.what());
}
}
readError = true;
aio->queueWriteClose();
}
}} // namespace qpid::sys
|
