/
ClientConnectorDocs.java
440 lines (384 loc) · 15.8 KB
/
ClientConnectorDocs.java
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
436
437
438
439
440
//
// ========================================================================
// Copyright (c) 1995-2022 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.docs.programming.client;
import java.io.ByteArrayOutputStream;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Executor;
import java.util.function.Consumer;
import org.eclipse.jetty.io.AbstractConnection;
import org.eclipse.jetty.io.ClientConnectionFactory;
import org.eclipse.jetty.io.ClientConnector;
import org.eclipse.jetty.io.EndPoint;
import org.eclipse.jetty.io.SelectorManager;
import org.eclipse.jetty.io.ssl.SslClientConnectionFactory;
import org.eclipse.jetty.io.ssl.SslConnection;
import org.eclipse.jetty.util.BufferUtil;
import org.eclipse.jetty.util.Callback;
import org.eclipse.jetty.util.Promise;
import org.eclipse.jetty.util.ssl.SslContextFactory;
import org.eclipse.jetty.util.thread.QueuedThreadPool;
import org.eclipse.jetty.util.thread.ScheduledExecutorScheduler;
import org.eclipse.jetty.util.thread.Scheduler;
import static java.lang.System.Logger.Level.INFO;
@SuppressWarnings("unused")
public class ClientConnectorDocs
{
public void simplest() throws Exception
{
// tag::simplest[]
ClientConnector clientConnector = new ClientConnector();
clientConnector.start();
// end::simplest[]
}
public void typical() throws Exception
{
// tag::typical[]
// Create and configure the SslContextFactory.
SslContextFactory.Client sslContextFactory = new SslContextFactory.Client();
sslContextFactory.addExcludeProtocols("TLSv1", "TLSv1.1");
// Create and configure the thread pool.
QueuedThreadPool threadPool = new QueuedThreadPool();
threadPool.setName("client");
// Create and configure the ClientConnector.
ClientConnector clientConnector = new ClientConnector();
clientConnector.setSslContextFactory(sslContextFactory);
clientConnector.setExecutor(threadPool);
clientConnector.start();
// end::typical[]
}
public void advanced() throws Exception
{
// tag::advanced[]
class CustomClientConnector extends ClientConnector
{
@Override
protected SelectorManager newSelectorManager()
{
return new ClientSelectorManager(getExecutor(), getScheduler(), getSelectors())
{
@Override
protected void endPointOpened(EndPoint endpoint)
{
System.getLogger("endpoint").log(INFO, "opened %s", endpoint);
}
@Override
protected void endPointClosed(EndPoint endpoint)
{
System.getLogger("endpoint").log(INFO, "closed %s", endpoint);
}
};
}
}
// Create and configure the thread pool.
QueuedThreadPool threadPool = new QueuedThreadPool();
threadPool.setName("client");
// Create and configure the scheduler.
Scheduler scheduler = new ScheduledExecutorScheduler("scheduler-client", false);
// Create and configure the custom ClientConnector.
CustomClientConnector clientConnector = new CustomClientConnector();
clientConnector.setExecutor(threadPool);
clientConnector.setScheduler(scheduler);
clientConnector.start();
// end::advanced[]
}
public void connect() throws Exception
{
// tag::connect[]
class CustomConnection extends AbstractConnection
{
public CustomConnection(EndPoint endPoint, Executor executor)
{
super(endPoint, executor);
}
@Override
public void onOpen()
{
super.onOpen();
System.getLogger("connection").log(INFO, "Opened connection {0}", this);
}
@Override
public void onFillable()
{
}
}
ClientConnector clientConnector = new ClientConnector();
clientConnector.start();
String host = "serverHost";
int port = 8080;
SocketAddress address = new InetSocketAddress(host, port);
// The ClientConnectionFactory that creates CustomConnection instances.
ClientConnectionFactory connectionFactory = (endPoint, context) ->
{
System.getLogger("connection").log(INFO, "Creating connection for {0}", endPoint);
return new CustomConnection(endPoint, clientConnector.getExecutor());
};
// The Promise to notify of connection creation success or failure.
CompletableFuture<CustomConnection> connectionPromise = new Promise.Completable<>();
// Populate the context with the mandatory keys to create and obtain connections.
Map<String, Object> context = new HashMap<>();
context.put(ClientConnector.CLIENT_CONNECTION_FACTORY_CONTEXT_KEY, connectionFactory);
context.put(ClientConnector.CONNECTION_PROMISE_CONTEXT_KEY, connectionPromise);
clientConnector.connect(address, context);
// Use the Connection when it's available.
// Use it in a non-blocking way via CompletableFuture APIs.
connectionPromise.whenComplete((connection, failure) ->
{
System.getLogger("connection").log(INFO, "Created connection for {0}", connection);
});
// Alternatively, you can block waiting for the connection (or a failure).
// CustomConnection connection = connectionPromise.get();
// end::connect[]
}
public void telnet() throws Exception
{
// tag::telnet[]
class TelnetConnection extends AbstractConnection
{
private final ByteArrayOutputStream bytes = new ByteArrayOutputStream();
private Consumer<String> consumer;
public TelnetConnection(EndPoint endPoint, Executor executor)
{
super(endPoint, executor);
}
@Override
public void onOpen()
{
super.onOpen();
// Declare interest for fill events.
fillInterested();
}
@Override
public void onFillable()
{
try
{
ByteBuffer buffer = BufferUtil.allocate(1024);
while (true)
{
int filled = getEndPoint().fill(buffer);
if (filled > 0)
{
while (buffer.hasRemaining())
{
// Search for newline.
byte read = buffer.get();
if (read == '\n')
{
// Notify the consumer of the line.
consumer.accept(bytes.toString(StandardCharsets.UTF_8));
bytes.reset();
}
else
{
bytes.write(read);
}
}
}
else if (filled == 0)
{
// No more bytes to fill, declare
// again interest for fill events.
fillInterested();
return;
}
else
{
// The other peer closed the
// connection, close it back.
getEndPoint().close();
return;
}
}
}
catch (Exception x)
{
getEndPoint().close(x);
}
}
public void onLine(Consumer<String> consumer)
{
this.consumer = consumer;
}
public void writeLine(String line, Callback callback)
{
line = line + "\r\n";
getEndPoint().write(callback, ByteBuffer.wrap(line.getBytes(StandardCharsets.UTF_8)));
}
}
ClientConnector clientConnector = new ClientConnector();
clientConnector.start();
String host = "wikipedia.org";
int port = 80;
SocketAddress address = new InetSocketAddress(host, port);
ClientConnectionFactory connectionFactory = (endPoint, context) ->
new TelnetConnection(endPoint, clientConnector.getExecutor());
CompletableFuture<TelnetConnection> connectionPromise = new Promise.Completable<>();
Map<String, Object> context = new HashMap<>();
context.put(ClientConnector.CLIENT_CONNECTION_FACTORY_CONTEXT_KEY, connectionFactory);
context.put(ClientConnector.CONNECTION_PROMISE_CONTEXT_KEY, connectionPromise);
clientConnector.connect(address, context);
connectionPromise.whenComplete((connection, failure) ->
{
if (failure == null)
{
// Register a listener that receives string lines.
connection.onLine(line -> System.getLogger("app").log(INFO, "line: {0}", line));
// Write a line.
connection.writeLine("" +
"GET / HTTP/1.0\r\n" +
"", Callback.NOOP);
}
else
{
failure.printStackTrace();
}
});
// end::telnet[]
}
public void tlsTelnet() throws Exception
{
// tag::tlsTelnet[]
class TelnetConnection extends AbstractConnection
{
private final ByteArrayOutputStream bytes = new ByteArrayOutputStream();
private Consumer<String> consumer;
public TelnetConnection(EndPoint endPoint, Executor executor)
{
super(endPoint, executor);
}
@Override
public void onOpen()
{
super.onOpen();
// Declare interest for fill events.
fillInterested();
}
@Override
public void onFillable()
{
try
{
ByteBuffer buffer = BufferUtil.allocate(1024);
while (true)
{
int filled = getEndPoint().fill(buffer);
if (filled > 0)
{
while (buffer.hasRemaining())
{
// Search for newline.
byte read = buffer.get();
if (read == '\n')
{
// Notify the consumer of the line.
consumer.accept(bytes.toString(StandardCharsets.UTF_8));
bytes.reset();
}
else
{
bytes.write(read);
}
}
}
else if (filled == 0)
{
// No more bytes to fill, declare
// again interest for fill events.
fillInterested();
return;
}
else
{
// The other peer closed the
// connection, close it back.
getEndPoint().close();
return;
}
}
}
catch (Exception x)
{
getEndPoint().close(x);
}
}
public void onLine(Consumer<String> consumer)
{
this.consumer = consumer;
}
public void writeLine(String line, Callback callback)
{
line = line + "\r\n";
getEndPoint().write(callback, ByteBuffer.wrap(line.getBytes(StandardCharsets.UTF_8)));
}
}
ClientConnector clientConnector = new ClientConnector();
clientConnector.start();
// Use port 443 to contact the server using encrypted HTTP.
String host = "wikipedia.org";
int port = 443;
SocketAddress address = new InetSocketAddress(host, port);
ClientConnectionFactory connectionFactory = (endPoint, context) ->
new TelnetConnection(endPoint, clientConnector.getExecutor());
// Wrap the "telnet" ClientConnectionFactory with the SslClientConnectionFactory.
connectionFactory = new SslClientConnectionFactory(clientConnector.getSslContextFactory(),
clientConnector.getByteBufferPool(), clientConnector.getRetainableByteBufferPool(),
clientConnector.getExecutor(), connectionFactory);
// We will obtain a SslConnection now.
CompletableFuture<SslConnection> connectionPromise = new Promise.Completable<>();
Map<String, Object> context = new HashMap<>();
context.put(ClientConnector.CLIENT_CONNECTION_FACTORY_CONTEXT_KEY, connectionFactory);
context.put(ClientConnector.CONNECTION_PROMISE_CONTEXT_KEY, connectionPromise);
clientConnector.connect(address, context);
connectionPromise.whenComplete((sslConnection, failure) ->
{
if (failure == null)
{
// Unwrap the SslConnection to access the "line" APIs in TelnetConnection.
TelnetConnection connection = (TelnetConnection)sslConnection.getDecryptedEndPoint().getConnection();
// Register a listener that receives string lines.
connection.onLine(line -> System.getLogger("app").log(INFO, "line: {0}", line));
// Write a line.
connection.writeLine("" +
"GET / HTTP/1.0\r\n" +
"", Callback.NOOP);
}
else
{
failure.printStackTrace();
}
});
// end::tlsTelnet[]
}
public void unixDomain() throws Exception
{
// tag::unixDomain[]
// This is the path where the server "listens" on.
Path unixDomainPath = Path.of("/path/to/server.sock");
// Creates a ClientConnector that uses Unix-Domain
// sockets, not the network, to connect to the server.
ClientConnector clientConnector = ClientConnector.forUnixDomain(unixDomainPath);
clientConnector.start();
// end::unixDomain[]
}
public static void main(String[] args) throws Exception
{
new ClientConnectorDocs().tlsTelnet();
}
}