1 /*
2 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 */
24 package java.net.http;
25
26 import java.io.IOException;
27 import java.net.InetSocketAddress;
28 import java.net.StandardSocketOptions;
29 import java.nio.ByteBuffer;
30 import java.nio.channels.SelectableChannel;
31 import java.nio.channels.SelectionKey;
32 import java.nio.channels.SocketChannel;
33 import java.util.concurrent.CompletableFuture;
34 import java.util.function.Consumer;
35
36 /**
37 * Plain raw TCP connection direct to destination. 2 modes
38 * 1) Blocking used by http/1. In this case the connect is actually non
39 * blocking but the request is sent blocking. The first byte of a response
40 * is received non-blocking and the remainder of the response is received
41 * blocking
42 * 2) Non-blocking. In this case (for http/2) the connection is actually opened
43 * blocking but all reads and writes are done non-blocking under the
44 * control of a Http2Connection object.
45 */
46 class PlainHttpConnection extends HttpConnection implements AsyncConnection {
47
48 protected SocketChannel chan;
49 private volatile boolean connected;
50 private boolean closed;
51 Consumer<ByteBuffer> asyncReceiver;
52 Consumer<Throwable> errorReceiver;
53 Queue<ByteBuffer> asyncOutputQ;
54 final Object reading = new Object();
55 final Object writing = new Object();
56
57 @Override
58 public void startReading() {
59 try {
60 client.registerEvent(new ReadEvent());
61 } catch (IOException e) {
62 shutdown();
63 }
64 }
65
66 class ConnectEvent extends AsyncEvent {
67 CompletableFuture<Void> cf;
68
69 ConnectEvent(CompletableFuture<Void> cf) {
70 super(AsyncEvent.BLOCKING);
71 this.cf = cf;
72 }
73
74 @Override
75 public SelectableChannel channel() {
76 return chan;
77 }
78
79 @Override
80 public int interestOps() {
81 return SelectionKey.OP_CONNECT;
82 }
83
84 @Override
85 public void handle() {
86 try {
87 chan.finishConnect();
88 } catch (IOException e) {
89 cf.completeExceptionally(e);
90 }
91 connected = true;
92 cf.complete(null);
93 }
94
95 @Override
96 public void abort() {
97 close();
98 }
99 }
100
101 @Override
102 public CompletableFuture<Void> connectAsync() {
103 CompletableFuture<Void> plainFuture = new CompletableFuture<>();
104 try {
105 chan.configureBlocking(false);
106 chan.connect(address);
107 client.registerEvent(new ConnectEvent(plainFuture));
108 } catch (IOException e) {
109 plainFuture.completeExceptionally(e);
110 }
111 return plainFuture;
112 }
113
114 @Override
115 public void connect() throws IOException {
116 chan.connect(address);
117 connected = true;
118 }
119
120 @Override
121 SocketChannel channel() {
122 return chan;
123 }
124
125 PlainHttpConnection(InetSocketAddress addr, HttpClientImpl client) {
126 super(addr, client);
127 try {
128 this.chan = SocketChannel.open();
129 int bufsize = client.getReceiveBufferSize();
130 chan.setOption(StandardSocketOptions.SO_RCVBUF, bufsize);
131 chan.setOption(StandardSocketOptions.TCP_NODELAY, true);
132 } catch (IOException e) {
133 throw new InternalError(e);
134 }
135 }
136
137 @Override
138 long write(ByteBuffer[] buffers, int start, int number) throws IOException {
139 if (mode != Mode.ASYNC)
140 return chan.write(buffers, start, number);
141 // async
142 synchronized(writing) {
143 int qlen = asyncOutputQ.size();
144 ByteBuffer[] bufs = Utils.reduce(buffers, start, number);
145 long n = Utils.remaining(bufs);
146 asyncOutputQ.putAll(bufs);
147 if (qlen == 0)
148 asyncOutput();
149 return n;
150 }
151 }
152
153 ByteBuffer asyncBuffer = null;
154
155 void asyncOutput() {
156 synchronized (writing) {
157 try {
158 while (true) {
159 if (asyncBuffer == null) {
160 asyncBuffer = asyncOutputQ.poll();
161 if (asyncBuffer == null) {
162 return;
163 }
164 }
165 if (!asyncBuffer.hasRemaining()) {
166 asyncBuffer = null;
167 continue;
168 }
169 int n = chan.write(asyncBuffer);
170 //System.err.printf("Written %d bytes to chan\n", n);
171 if (n == 0) {
172 client.registerEvent(new WriteEvent());
173 return;
174 }
175 }
176 } catch (IOException e) {
177 shutdown();
178 }
179 }
180 }
181
182 @Override
183 long write(ByteBuffer buffer) throws IOException {
184 if (mode != Mode.ASYNC)
185 return chan.write(buffer);
186 // async
187 synchronized(writing) {
188 int qlen = asyncOutputQ.size();
189 long n = buffer.remaining();
190 asyncOutputQ.put(buffer);
191 if (qlen == 0)
192 asyncOutput();
193 return n;
194 }
195 }
196
197 @Override
198 public String toString() {
199 return "PlainHttpConnection: " + super.toString();
200 }
201
202 /**
203 * Close this connection
204 */
205 @Override
206 public synchronized void close() {
207 if (closed)
208 return;
209 closed = true;
210 try {
211 Log.logError("Closing: " + toString());
212 //System.out.println("Closing: " + this);
213 chan.close();
214 } catch (IOException e) {}
215 }
216
217 @Override
218 protected ByteBuffer readImpl(int length) throws IOException {
219 ByteBuffer buf = getBuffer(); // TODO not using length
220 int n = chan.read(buf);
221 if (n == -1) {
222 return null;
223 }
224 buf.flip();
225 String s = "Receive (" + n + " bytes) ";
226 //debugPrint(s, buf);
227 return buf;
228 }
229
230 void shutdown() {
231 close();
232 errorReceiver.accept(new IOException("Connection aborted"));
233 }
234
235 void asyncRead() {
236 synchronized (reading) {
237 try {
238 while (true) {
239 ByteBuffer buf = getBuffer();
240 int n = chan.read(buf);
241 //System.err.printf("Read %d bytes from chan\n", n);
242 if (n == -1) {
243 throw new IOException();
244 }
245 if (n == 0) {
246 returnBuffer(buf);
247 return;
248 }
249 buf.flip();
250 asyncReceiver.accept(buf);
251 }
252 } catch (IOException e) {
253 shutdown();
254 }
255 }
256 }
257
258 @Override
259 protected int readImpl(ByteBuffer buf) throws IOException {
260 int mark = buf.position();
261 int n;
262 // FIXME: this hack works in conjunction with the corresponding change
263 // in java.net.http.RawChannel.registerEvent
264 if ((n = buffer.remaining()) != 0) {
265 buf.put(buffer);
266 } else {
267 n = chan.read(buf);
268 }
269 if (n == -1) {
270 return -1;
271 }
272 Utils.flipToMark(buf, mark);
273 String s = "Receive (" + n + " bytes) ";
274 //debugPrint(s, buf);
275 return n;
276 }
277
278 @Override
279 ConnectionPool.CacheKey cacheKey() {
280 return new ConnectionPool.CacheKey(address, null);
281 }
282
283 @Override
284 synchronized boolean connected() {
285 return connected;
286 }
287
288 // used for all output in HTTP/2
289 class WriteEvent extends AsyncEvent {
290 WriteEvent() {
291 super(0);
292 }
293
294 @Override
295 public SelectableChannel channel() {
296 return chan;
297 }
298
299 @Override
300 public int interestOps() {
301 return SelectionKey.OP_WRITE;
302 }
303
304 @Override
305 public void handle() {
306 asyncOutput();
307 }
308
309 @Override
310 public void abort() {
311 shutdown();
312 }
313 }
314
315 // used for all input in HTTP/2
316 class ReadEvent extends AsyncEvent {
317 ReadEvent() {
318 super(AsyncEvent.REPEATING); // && !BLOCKING
319 }
320
321 @Override
322 public SelectableChannel channel() {
323 return chan;
324 }
325
326 @Override
327 public int interestOps() {
328 return SelectionKey.OP_READ;
329 }
330
331 @Override
332 public void handle() {
333 asyncRead();
334 }
335
336 @Override
337 public void abort() {
338 shutdown();
339 }
340
341 }
342
343 // used in blocking channels only
344 class ReceiveResponseEvent extends AsyncEvent {
345 CompletableFuture<Void> cf;
346
347 ReceiveResponseEvent(CompletableFuture<Void> cf) {
348 super(AsyncEvent.BLOCKING);
349 this.cf = cf;
350 }
351 @Override
352 public SelectableChannel channel() {
353 return chan;
354 }
355
356 @Override
357 public void handle() {
358 cf.complete(null);
359 }
360
361 @Override
362 public int interestOps() {
363 return SelectionKey.OP_READ;
364 }
365
366 @Override
367 public void abort() {
368 close();
369 }
370 }
371
372 @Override
373 boolean isSecure() {
374 return false;
375 }
376
377 @Override
378 boolean isProxied() {
379 return false;
380 }
381
382 @Override
383 public synchronized void setAsyncCallbacks(Consumer<ByteBuffer> asyncReceiver,
384 Consumer<Throwable> errorReceiver) {
385 this.asyncReceiver = asyncReceiver;
386 this.errorReceiver = errorReceiver;
387 asyncOutputQ = new Queue<>();
388 asyncOutputQ.registerPutCallback(this::asyncOutput);
389 }
390
391 @Override
392 CompletableFuture<Void> whenReceivingResponse() {
393 CompletableFuture<Void> cf = new CompletableFuture<>();
394 try {
395 client.registerEvent(new ReceiveResponseEvent(cf));
396 } catch (IOException e) {
397 cf.completeExceptionally(e);
398 }
399 return cf;
400 }
401 }