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 * questions.
24 */
25
26 package java.net.http;
27
28 import java.io.IOException;
29 import java.net.InetSocketAddress;
30 import java.net.StandardSocketOptions;
31 import java.nio.ByteBuffer;
32 import java.nio.channels.SelectableChannel;
33 import java.nio.channels.SelectionKey;
34 import java.nio.channels.SocketChannel;
35 import java.util.concurrent.CompletableFuture;
36 import java.util.function.Consumer;
37
38 /**
39 * Plain raw TCP connection direct to destination. 2 modes
40 * 1) Blocking used by http/1. In this case the connect is actually non
41 * blocking but the request is sent blocking. The first byte of a response
42 * is received non-blocking and the remainder of the response is received
43 * blocking
44 * 2) Non-blocking. In this case (for http/2) the connection is actually opened
45 * blocking but all reads and writes are done non-blocking under the
46 * control of a Http2Connection object.
47 */
48 class PlainHttpConnection extends HttpConnection implements AsyncConnection {
49
50 protected SocketChannel chan;
51 private volatile boolean connected;
52 private boolean closed;
53 Consumer<ByteBuffer> asyncReceiver;
54 Consumer<Throwable> errorReceiver;
55 Queue<ByteBuffer> asyncOutputQ;
56 final Object reading = new Object();
57 final Object writing = new Object();
58
59 @Override
60 public void startReading() {
61 try {
62 client.registerEvent(new ReadEvent());
63 } catch (IOException e) {
64 shutdown();
65 }
66 }
67
68 class ConnectEvent extends AsyncEvent {
69 CompletableFuture<Void> cf;
70
71 ConnectEvent(CompletableFuture<Void> cf) {
72 super(AsyncEvent.BLOCKING);
73 this.cf = cf;
74 }
75
76 @Override
77 public SelectableChannel channel() {
78 return chan;
79 }
80
81 @Override
82 public int interestOps() {
83 return SelectionKey.OP_CONNECT;
84 }
85
86 @Override
87 public void handle() {
88 try {
89 chan.finishConnect();
90 } catch (IOException e) {
91 cf.completeExceptionally(e);
92 }
93 connected = true;
94 cf.complete(null);
95 }
96
97 @Override
98 public void abort() {
99 close();
100 }
101 }
102
103 @Override
104 public CompletableFuture<Void> connectAsync() {
105 CompletableFuture<Void> plainFuture = new CompletableFuture<>();
106 try {
107 chan.configureBlocking(false);
108 chan.connect(address);
109 client.registerEvent(new ConnectEvent(plainFuture));
110 } catch (IOException e) {
111 plainFuture.completeExceptionally(e);
112 }
113 return plainFuture;
114 }
115
116 @Override
117 public void connect() throws IOException {
118 chan.connect(address);
119 connected = true;
120 }
121
122 @Override
123 SocketChannel channel() {
124 return chan;
125 }
126
127 PlainHttpConnection(InetSocketAddress addr, HttpClientImpl client) {
128 super(addr, client);
129 try {
130 this.chan = SocketChannel.open();
131 int bufsize = client.getReceiveBufferSize();
132 chan.setOption(StandardSocketOptions.SO_RCVBUF, bufsize);
133 chan.setOption(StandardSocketOptions.TCP_NODELAY, true);
134 } catch (IOException e) {
135 throw new InternalError(e);
136 }
137 }
138
139 @Override
140 long write(ByteBuffer[] buffers, int start, int number) throws IOException {
141 if (mode != Mode.ASYNC)
142 return chan.write(buffers, start, number);
143 // async
144 synchronized(writing) {
145 int qlen = asyncOutputQ.size();
146 ByteBuffer[] bufs = Utils.reduce(buffers, start, number);
147 long n = Utils.remaining(bufs);
148 asyncOutputQ.putAll(bufs);
149 if (qlen == 0)
150 asyncOutput();
151 return n;
152 }
153 }
154
155 ByteBuffer asyncBuffer = null;
156
157 void asyncOutput() {
158 synchronized (writing) {
159 try {
160 while (true) {
161 if (asyncBuffer == null) {
162 asyncBuffer = asyncOutputQ.poll();
163 if (asyncBuffer == null) {
164 return;
165 }
166 }
167 if (!asyncBuffer.hasRemaining()) {
168 asyncBuffer = null;
169 continue;
170 }
171 int n = chan.write(asyncBuffer);
172 //System.err.printf("Written %d bytes to chan\n", n);
173 if (n == 0) {
174 client.registerEvent(new WriteEvent());
175 return;
176 }
177 }
178 } catch (IOException e) {
179 shutdown();
180 }
181 }
182 }
183
184 @Override
185 long write(ByteBuffer buffer) throws IOException {
186 if (mode != Mode.ASYNC)
187 return chan.write(buffer);
188 // async
189 synchronized(writing) {
190 int qlen = asyncOutputQ.size();
191 long n = buffer.remaining();
192 asyncOutputQ.put(buffer);
193 if (qlen == 0)
194 asyncOutput();
195 return n;
196 }
197 }
198
199 @Override
200 public String toString() {
201 return "PlainHttpConnection: " + super.toString();
202 }
203
204 /**
205 * Close this connection
206 */
207 @Override
208 public synchronized void close() {
209 if (closed)
210 return;
211 closed = true;
212 try {
213 Log.logError("Closing: " + toString());
214 //System.out.println("Closing: " + this);
215 chan.close();
216 } catch (IOException e) {}
217 }
218
219 @Override
220 protected ByteBuffer readImpl(int length) throws IOException {
221 ByteBuffer buf = getBuffer(); // TODO not using length
222 int n = chan.read(buf);
223 if (n == -1) {
224 return null;
225 }
226 buf.flip();
227 String s = "Receive (" + n + " bytes) ";
228 //debugPrint(s, buf);
229 return buf;
230 }
231
232 void shutdown() {
233 close();
234 errorReceiver.accept(new IOException("Connection aborted"));
235 }
236
237 void asyncRead() {
238 synchronized (reading) {
239 try {
240 while (true) {
241 ByteBuffer buf = getBuffer();
242 int n = chan.read(buf);
243 //System.err.printf("Read %d bytes from chan\n", n);
244 if (n == -1) {
245 throw new IOException();
246 }
247 if (n == 0) {
248 returnBuffer(buf);
249 return;
250 }
251 buf.flip();
252 asyncReceiver.accept(buf);
253 }
254 } catch (IOException e) {
255 shutdown();
256 }
257 }
258 }
259
260 @Override
261 protected int readImpl(ByteBuffer buf) throws IOException {
262 int mark = buf.position();
263 int n;
264 // FIXME: this hack works in conjunction with the corresponding change
265 // in java.net.http.RawChannel.registerEvent
266 if ((n = buffer.remaining()) != 0) {
267 buf.put(buffer);
268 } else {
269 n = chan.read(buf);
270 }
271 if (n == -1) {
272 return -1;
273 }
274 Utils.flipToMark(buf, mark);
275 String s = "Receive (" + n + " bytes) ";
276 //debugPrint(s, buf);
277 return n;
278 }
279
280 @Override
281 ConnectionPool.CacheKey cacheKey() {
282 return new ConnectionPool.CacheKey(address, null);
283 }
284
285 @Override
286 synchronized boolean connected() {
287 return connected;
288 }
289
290 // used for all output in HTTP/2
291 class WriteEvent extends AsyncEvent {
292 WriteEvent() {
293 super(0);
294 }
295
296 @Override
297 public SelectableChannel channel() {
298 return chan;
299 }
300
301 @Override
302 public int interestOps() {
303 return SelectionKey.OP_WRITE;
304 }
305
306 @Override
307 public void handle() {
308 asyncOutput();
309 }
310
311 @Override
312 public void abort() {
313 shutdown();
314 }
315 }
316
317 // used for all input in HTTP/2
318 class ReadEvent extends AsyncEvent {
319 ReadEvent() {
320 super(AsyncEvent.REPEATING); // && !BLOCKING
321 }
322
323 @Override
324 public SelectableChannel channel() {
325 return chan;
326 }
327
328 @Override
329 public int interestOps() {
330 return SelectionKey.OP_READ;
331 }
332
333 @Override
334 public void handle() {
335 asyncRead();
336 }
337
338 @Override
339 public void abort() {
340 shutdown();
341 }
342
343 }
344
345 // used in blocking channels only
346 class ReceiveResponseEvent extends AsyncEvent {
347 CompletableFuture<Void> cf;
348
349 ReceiveResponseEvent(CompletableFuture<Void> cf) {
350 super(AsyncEvent.BLOCKING);
351 this.cf = cf;
352 }
353 @Override
354 public SelectableChannel channel() {
355 return chan;
356 }
357
358 @Override
359 public void handle() {
360 cf.complete(null);
361 }
362
363 @Override
364 public int interestOps() {
365 return SelectionKey.OP_READ;
366 }
367
368 @Override
369 public void abort() {
370 close();
371 }
372 }
373
374 @Override
375 boolean isSecure() {
376 return false;
377 }
378
379 @Override
380 boolean isProxied() {
381 return false;
382 }
383
384 @Override
385 public synchronized void setAsyncCallbacks(Consumer<ByteBuffer> asyncReceiver,
386 Consumer<Throwable> errorReceiver) {
387 this.asyncReceiver = asyncReceiver;
388 this.errorReceiver = errorReceiver;
389 asyncOutputQ = new Queue<>();
390 asyncOutputQ.registerPutCallback(this::asyncOutput);
391 }
392
393 @Override
394 CompletableFuture<Void> whenReceivingResponse() {
395 CompletableFuture<Void> cf = new CompletableFuture<>();
396 try {
397 client.registerEvent(new ReceiveResponseEvent(cf));
398 } catch (IOException e) {
399 cf.completeExceptionally(e);
400 }
401 return cf;
402 }
403 }