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
|
#include "Swiften/Network/Connector.h"
#include <boost/bind.hpp>
#include <iostream>
#include "Swiften/Network/ConnectionFactory.h"
#include "Swiften/Network/DomainNameResolver.h"
#include "Swiften/Network/DomainNameAddressQuery.h"
#include "Swiften/Network/TimerFactory.h"
namespace Swift {
Connector::Connector(const String& hostname, DomainNameResolver* resolver, ConnectionFactory* connectionFactory, TimerFactory* timerFactory) : hostname(hostname), resolver(resolver), connectionFactory(connectionFactory), timerFactory(timerFactory), timeoutMilliseconds(0), queriedAllServices(true) {
}
void Connector::setTimeoutMilliseconds(int milliseconds) {
timeoutMilliseconds = milliseconds;
}
void Connector::start() {
//std::cout << "Connector::start()" << std::endl;
assert(!currentConnection);
assert(!serviceQuery);
assert(!timer);
queriedAllServices = false;
serviceQuery = resolver->createServiceQuery("_xmpp-client._tcp." + hostname);
serviceQuery->onResult.connect(boost::bind(&Connector::handleServiceQueryResult, this, _1));
if (timeoutMilliseconds > 0) {
timer = timerFactory->createTimer(timeoutMilliseconds);
timer->onTick.connect(boost::bind(&Connector::handleTimeout, this));
timer->start();
}
serviceQuery->run();
}
void Connector::queryAddress(const String& hostname) {
assert(!addressQuery);
addressQuery = resolver->createAddressQuery(hostname);
addressQuery->onResult.connect(boost::bind(&Connector::handleAddressQueryResult, this, _1, _2));
addressQuery->run();
}
void Connector::handleServiceQueryResult(const std::vector<DomainNameServiceQuery::Result>& result) {
//std::cout << "Received SRV results" << std::endl;
serviceQueryResults = std::deque<DomainNameServiceQuery::Result>(result.begin(), result.end());
serviceQuery.reset();
tryNextServiceOrFallback();
}
void Connector::tryNextServiceOrFallback() {
if (queriedAllServices) {
//std::cout << "Connector::tryNextServiceOrCallback(): Queried all hosts. Error." << std::endl;
finish(boost::shared_ptr<Connection>());
}
else if (serviceQueryResults.empty()) {
//std::cout << "Connector::tryNextHostName(): Falling back on A resolution" << std::endl;
// Fall back on simple address resolving
queriedAllServices = true;
queryAddress(hostname);
}
else {
//std::cout << "Connector::tryNextHostName(): Querying next address" << std::endl;
queryAddress(serviceQueryResults.front().hostname);
}
}
void Connector::handleAddressQueryResult(const std::vector<HostAddress>& addresses, boost::optional<DomainNameResolveError> error) {
//std::cout << "Connector::handleAddressQueryResult(): Start" << std::endl;
addressQuery.reset();
if (error || addresses.empty()) {
if (!serviceQueryResults.empty()) {
serviceQueryResults.pop_front();
}
tryNextServiceOrFallback();
}
else {
addressQueryResults = std::deque<HostAddress>(addresses.begin(), addresses.end());
tryNextAddress();
}
}
void Connector::tryNextAddress() {
if (addressQueryResults.empty()) {
//std::cout << "Connector::tryNextAddress(): Done trying addresses. Moving on" << std::endl;
// Done trying all addresses. Move on to the next host.
if (!serviceQueryResults.empty()) {
serviceQueryResults.pop_front();
}
tryNextServiceOrFallback();
}
else {
//std::cout << "Connector::tryNextAddress(): trying next address." << std::endl;
HostAddress address = addressQueryResults.front();
addressQueryResults.pop_front();
int port = 5222;
if (!serviceQueryResults.empty()) {
port = serviceQueryResults.front().port;
}
tryConnect(HostAddressPort(address, port));
}
}
void Connector::tryConnect(const HostAddressPort& target) {
assert(!currentConnection);
//std::cout << "Connector::tryConnect() " << target.getAddress().toString() << " " << target.getPort() << std::endl;
currentConnection = connectionFactory->createConnection();
currentConnection->onConnectFinished.connect(boost::bind(&Connector::handleConnectionConnectFinished, this, _1));
currentConnection->connect(target);
}
void Connector::handleConnectionConnectFinished(bool error) {
//std::cout << "Connector::handleConnectionConnectFinished() " << error << std::endl;
if (error) {
currentConnection.reset();
if (!addressQueryResults.empty()) {
tryNextAddress();
}
else {
if (!serviceQueryResults.empty()) {
serviceQueryResults.pop_front();
}
tryNextServiceOrFallback();
}
}
else {
finish(currentConnection);
}
}
void Connector::finish(boost::shared_ptr<Connection> connection) {
if (timer) {
timer->stop();
timer.reset();
}
onConnectFinished(connection);
}
void Connector::handleTimeout() {
finish(boost::shared_ptr<Connection>());
}
};
|