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30 package org.apache.commons.httpclient;
31
32 import java.io.BufferedInputStream;
33 import java.io.BufferedOutputStream;
34 import java.io.IOException;
35 import java.io.InputStream;
36 import java.io.InterruptedIOException;
37 import java.io.OutputStream;
38 import java.lang.reflect.Method;
39 import java.net.InetAddress;
40 import java.net.Socket;
41 import java.net.SocketException;
42
43 import org.apache.commons.httpclient.params.HttpConnectionParams;
44 import org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory;
45 import org.apache.commons.httpclient.protocol.Protocol;
46 import org.apache.commons.httpclient.protocol.ProtocolSocketFactory;
47 import org.apache.commons.httpclient.protocol.SecureProtocolSocketFactory;
48 import org.apache.commons.httpclient.util.EncodingUtil;
49 import org.apache.commons.httpclient.util.ExceptionUtil;
50 import org.apache.commons.logging.Log;
51 import org.apache.commons.logging.LogFactory;
52
53 /***
54 * An abstraction of an HTTP {@link InputStream} and {@link OutputStream}
55 * pair, together with the relevant attributes.
56 * <p>
57 * The following options are set on the socket before getting the input/output
58 * streams in the {@link #open()} method:
59 * <table border=1><tr>
60 * <th>Socket Method
61 * <th>Sockets Option
62 * <th>Configuration
63 * </tr><tr>
64 * <td>{@link java.net.Socket#setTcpNoDelay(boolean)}
65 * <td>SO_NODELAY
66 * <td>{@link HttpConnectionParams#setTcpNoDelay(boolean)}
67 * </tr><tr>
68 * <td>{@link java.net.Socket#setSoTimeout(int)}
69 * <td>SO_TIMEOUT
70 * <td>{@link HttpConnectionParams#setSoTimeout(int)}
71 * </tr><tr>
72 * <td>{@link java.net.Socket#setSendBufferSize(int)}
73 * <td>SO_SNDBUF
74 * <td>{@link HttpConnectionParams#setSendBufferSize(int)}
75 * </tr><tr>
76 * <td>{@link java.net.Socket#setReceiveBufferSize(int)}
77 * <td>SO_RCVBUF
78 * <td>{@link HttpConnectionParams#setReceiveBufferSize(int)}
79 * </tr></table>
80 *
81 * @author Rod Waldhoff
82 * @author Sean C. Sullivan
83 * @author Ortwin Glueck
84 * @author <a href="mailto:jsdever@apache.org">Jeff Dever</a>
85 * @author <a href="mailto:mbowler@GargoyleSoftware.com">Mike Bowler</a>
86 * @author <a href="mailto:oleg@ural.ru">Oleg Kalnichevski</a>
87 * @author Michael Becke
88 * @author Eric E Johnson
89 * @author Laura Werner
90 *
91 * @version $Revision: 156935 $ $Date: 2005-03-10 05:38:29 -0500 (Thu, 10 Mar 2005) $
92 */
93 public class HttpConnection {
94
95
96
97 /***
98 * Creates a new HTTP connection for the given host and port.
99 *
100 * @param host the host to connect to
101 * @param port the port to connect to
102 */
103 public HttpConnection(String host, int port) {
104 this(null, -1, host, null, port, Protocol.getProtocol("http"));
105 }
106
107 /***
108 * Creates a new HTTP connection for the given host and port
109 * using the given protocol.
110 *
111 * @param host the host to connect to
112 * @param port the port to connect to
113 * @param protocol the protocol to use
114 */
115 public HttpConnection(String host, int port, Protocol protocol) {
116 this(null, -1, host, null, port, protocol);
117 }
118
119 /***
120 * Creates a new HTTP connection for the given host with the virtual
121 * alias and port using given protocol.
122 *
123 * @param host the host to connect to
124 * @param virtualHost the virtual host requests will be sent to
125 * @param port the port to connect to
126 * @param protocol the protocol to use
127 */
128 public HttpConnection(String host, String virtualHost, int port, Protocol protocol) {
129 this(null, -1, host, virtualHost, port, protocol);
130 }
131
132 /***
133 * Creates a new HTTP connection for the given host and port via the
134 * given proxy host and port using the default protocol.
135 *
136 * @param proxyHost the host to proxy via
137 * @param proxyPort the port to proxy via
138 * @param host the host to connect to
139 * @param port the port to connect to
140 */
141 public HttpConnection(
142 String proxyHost,
143 int proxyPort,
144 String host,
145 int port) {
146 this(proxyHost, proxyPort, host, null, port, Protocol.getProtocol("http"));
147 }
148
149 /***
150 * Creates a new HTTP connection for the given host configuration.
151 *
152 * @param hostConfiguration the host/proxy/protocol to use
153 */
154 public HttpConnection(HostConfiguration hostConfiguration) {
155 this(hostConfiguration.getProxyHost(),
156 hostConfiguration.getProxyPort(),
157 hostConfiguration.getHost(),
158 hostConfiguration.getPort(),
159 hostConfiguration.getProtocol());
160 this.localAddress = hostConfiguration.getLocalAddress();
161 }
162
163 /***
164 * Creates a new HTTP connection for the given host with the virtual
165 * alias and port via the given proxy host and port using the given
166 * protocol.
167 *
168 * @param proxyHost the host to proxy via
169 * @param proxyPort the port to proxy via
170 * @param host the host to connect to. Parameter value must be non-null.
171 * @param virtualHost No longer applicable.
172 * @param port the port to connect to
173 * @param protocol The protocol to use. Parameter value must be non-null.
174 *
175 * @deprecated use #HttpConnection(String, int, String, int, Protocol)
176 */
177 public HttpConnection(
178 String proxyHost,
179 int proxyPort,
180 String host,
181 String virtualHost,
182 int port,
183 Protocol protocol) {
184 this(proxyHost, proxyPort, host, port, protocol);
185 }
186
187 /***
188 * Creates a new HTTP connection for the given host with the virtual
189 * alias and port via the given proxy host and port using the given
190 * protocol.
191 *
192 * @param proxyHost the host to proxy via
193 * @param proxyPort the port to proxy via
194 * @param host the host to connect to. Parameter value must be non-null.
195 * @param port the port to connect to
196 * @param protocol The protocol to use. Parameter value must be non-null.
197 */
198 public HttpConnection(
199 String proxyHost,
200 int proxyPort,
201 String host,
202 int port,
203 Protocol protocol) {
204
205 if (host == null) {
206 throw new IllegalArgumentException("host parameter is null");
207 }
208 if (protocol == null) {
209 throw new IllegalArgumentException("protocol is null");
210 }
211
212 proxyHostName = proxyHost;
213 proxyPortNumber = proxyPort;
214 hostName = host;
215 portNumber = protocol.resolvePort(port);
216 protocolInUse = protocol;
217 }
218
219
220
221 /***
222 * Returns the connection socket.
223 *
224 * @return the socket.
225 *
226 * @since 3.0
227 */
228 protected Socket getSocket() {
229 return this.socket;
230 }
231
232 /***
233 * Returns the host.
234 *
235 * @return the host.
236 */
237 public String getHost() {
238 return hostName;
239 }
240
241 /***
242 * Sets the host to connect to.
243 *
244 * @param host the host to connect to. Parameter value must be non-null.
245 * @throws IllegalStateException if the connection is already open
246 */
247 public void setHost(String host) throws IllegalStateException {
248 if (host == null) {
249 throw new IllegalArgumentException("host parameter is null");
250 }
251 assertNotOpen();
252 hostName = host;
253 }
254
255 /***
256 * Returns the target virtual host.
257 *
258 * @return the virtual host.
259 *
260 * @deprecated no longer applicable
261 */
262
263 public String getVirtualHost() {
264 return this.hostName;
265 }
266
267 /***
268 * Sets the virtual host to target.
269 *
270 * @param host the virtual host name that should be used instead of
271 * physical host name when sending HTTP requests. Virtual host
272 * name can be set to <tt> null</tt> if virtual host name is not
273 * to be used
274 *
275 * @throws IllegalStateException if the connection is already open
276 *
277 * @deprecated no longer applicable
278 */
279
280 public void setVirtualHost(String host) throws IllegalStateException {
281 assertNotOpen();
282 }
283
284 /***
285 * Returns the port of the host.
286 *
287 * If the port is -1 (or less than 0) the default port for
288 * the current protocol is returned.
289 *
290 * @return the port.
291 */
292 public int getPort() {
293 if (portNumber < 0) {
294 return isSecure() ? 443 : 80;
295 } else {
296 return portNumber;
297 }
298 }
299
300 /***
301 * Sets the port to connect to.
302 *
303 * @param port the port to connect to
304 *
305 * @throws IllegalStateException if the connection is already open
306 */
307 public void setPort(int port) throws IllegalStateException {
308 assertNotOpen();
309 portNumber = port;
310 }
311
312 /***
313 * Returns the proxy host.
314 *
315 * @return the proxy host.
316 */
317 public String getProxyHost() {
318 return proxyHostName;
319 }
320
321 /***
322 * Sets the host to proxy through.
323 *
324 * @param host the host to proxy through.
325 *
326 * @throws IllegalStateException if the connection is already open
327 */
328 public void setProxyHost(String host) throws IllegalStateException {
329 assertNotOpen();
330 proxyHostName = host;
331 }
332
333 /***
334 * Returns the port of the proxy host.
335 *
336 * @return the proxy port.
337 */
338 public int getProxyPort() {
339 return proxyPortNumber;
340 }
341
342 /***
343 * Sets the port of the host to proxy through.
344 *
345 * @param port the port of the host to proxy through.
346 *
347 * @throws IllegalStateException if the connection is already open
348 */
349 public void setProxyPort(int port) throws IllegalStateException {
350 assertNotOpen();
351 proxyPortNumber = port;
352 }
353
354 /***
355 * Returns <tt>true</tt> if the connection is established over
356 * a secure protocol.
357 *
358 * @return <tt>true</tt> if connected over a secure protocol.
359 */
360 public boolean isSecure() {
361 return protocolInUse.isSecure();
362 }
363
364 /***
365 * Returns the protocol used to establish the connection.
366 * @return The protocol
367 */
368 public Protocol getProtocol() {
369 return protocolInUse;
370 }
371
372 /***
373 * Sets the protocol used to establish the connection
374 *
375 * @param protocol The protocol to use.
376 *
377 * @throws IllegalStateException if the connection is already open
378 */
379 public void setProtocol(Protocol protocol) {
380 assertNotOpen();
381
382 if (protocol == null) {
383 throw new IllegalArgumentException("protocol is null");
384 }
385
386 protocolInUse = protocol;
387
388 }
389
390 /***
391 * Return the local address used when creating the connection.
392 * If <tt>null</tt>, the default address is used.
393 *
394 * @return InetAddress the local address to be used when creating Sockets
395 */
396 public InetAddress getLocalAddress() {
397 return this.localAddress;
398 }
399
400 /***
401 * Set the local address used when creating the connection.
402 * If unset or <tt>null</tt>, the default address is used.
403 *
404 * @param localAddress the local address to use
405 */
406 public void setLocalAddress(InetAddress localAddress) {
407 assertNotOpen();
408 this.localAddress = localAddress;
409 }
410
411 /***
412 * Tests if the connection is open.
413 *
414 * @return <code>true</code> if the connection is open
415 */
416 public boolean isOpen() {
417 return isOpen;
418 }
419
420 /***
421 * Closes the connection if stale.
422 *
423 * @return <code>true</code> if the connection was stale and therefore closed,
424 * <code>false</code> otherwise.
425 *
426 * @see #isStale()
427 *
428 * @since 3.0
429 */
430 public boolean closeIfStale() throws IOException {
431 if (isOpen && isStale()) {
432 LOG.debug("Connection is stale, closing...");
433 close();
434 return true;
435 }
436 return false;
437 }
438
439 /***
440 * Tests if stale checking is enabled.
441 *
442 * @return <code>true</code> if enabled
443 *
444 * @see #isStale()
445 *
446 * @deprecated Use {@link HttpConnectionParams#isStaleCheckingEnabled()},
447 * {@link HttpConnection#getParams()}.
448 */
449 public boolean isStaleCheckingEnabled() {
450 return this.params.isStaleCheckingEnabled();
451 }
452
453 /***
454 * Sets whether or not isStale() will be called when testing if this connection is open.
455 *
456 * <p>Setting this flag to <code>false</code> will increase performance when reusing
457 * connections, but it will also make them less reliable. Stale checking ensures that
458 * connections are viable before they are used. When set to <code>false</code> some
459 * method executions will result in IOExceptions and they will have to be retried.</p>
460 *
461 * @param staleCheckEnabled <code>true</code> to enable isStale()
462 *
463 * @see #isStale()
464 * @see #isOpen()
465 *
466 * @deprecated Use {@link HttpConnectionParams#setStaleCheckingEnabled(boolean)},
467 * {@link HttpConnection#getParams()}.
468 */
469 public void setStaleCheckingEnabled(boolean staleCheckEnabled) {
470 this.params.setStaleCheckingEnabled(staleCheckEnabled);
471 }
472
473 /***
474 * Determines whether this connection is "stale", which is to say that either
475 * it is no longer open, or an attempt to read the connection would fail.
476 *
477 * <p>Unfortunately, due to the limitations of the JREs prior to 1.4, it is
478 * not possible to test a connection to see if both the read and write channels
479 * are open - except by reading and writing. This leads to a difficulty when
480 * some connections leave the "write" channel open, but close the read channel
481 * and ignore the request. This function attempts to ameliorate that
482 * problem by doing a test read, assuming that the caller will be doing a
483 * write followed by a read, rather than the other way around.
484 * </p>
485 *
486 * <p>To avoid side-effects, the underlying connection is wrapped by a
487 * {@link BufferedInputStream}, so although data might be read, what is visible
488 * to clients of the connection will not change with this call.</p.
489 *
490 * @throws IOException if the stale connection test is interrupted.
491 *
492 * @return <tt>true</tt> if the connection is already closed, or a read would
493 * fail.
494 */
495 protected boolean isStale() throws IOException {
496 boolean isStale = true;
497 if (isOpen) {
498
499
500 isStale = false;
501 try {
502 if (inputStream.available() == 0) {
503 try {
504 socket.setSoTimeout(1);
505 inputStream.mark(1);
506 int byteRead = inputStream.read();
507 if (byteRead == -1) {
508
509
510 isStale = true;
511 } else {
512 inputStream.reset();
513 }
514 } finally {
515 socket.setSoTimeout(this.params.getSoTimeout());
516 }
517 }
518 } catch (InterruptedIOException e) {
519 if (!ExceptionUtil.isSocketTimeoutException(e)) {
520 throw e;
521 }
522
523 } catch (IOException e) {
524
525 LOG.debug(
526 "An error occurred while reading from the socket, is appears to be stale",
527 e
528 );
529 isStale = true;
530 }
531 }
532
533 return isStale;
534 }
535
536 /***
537 * Returns <tt>true</tt> if the connection is established via a proxy,
538 * <tt>false</tt> otherwise.
539 *
540 * @return <tt>true</tt> if a proxy is used to establish the connection,
541 * <tt>false</tt> otherwise.
542 */
543 public boolean isProxied() {
544 return (!(null == proxyHostName || 0 >= proxyPortNumber));
545 }
546
547 /***
548 * Set the state to keep track of the last response for the last request.
549 *
550 * <p>The connection managers use this to ensure that previous requests are
551 * properly closed before a new request is attempted. That way, a GET
552 * request need not be read in its entirety before a new request is issued.
553 * Instead, this stream can be closed as appropriate.</p>
554 *
555 * @param inStream The stream associated with an HttpMethod.
556 */
557 public void setLastResponseInputStream(InputStream inStream) {
558 lastResponseInputStream = inStream;
559 }
560
561 /***
562 * Returns the stream used to read the last response's body.
563 *
564 * <p>Clients will generally not need to call this function unless
565 * using HttpConnection directly, instead of calling {@link HttpClient#executeMethod}.
566 * For those clients, call this function, and if it returns a non-null stream,
567 * close the stream before attempting to execute a method. Note that
568 * calling "close" on the stream returned by this function <i>may</i> close
569 * the connection if the previous response contained a "Connection: close" header. </p>
570 *
571 * @return An {@link InputStream} corresponding to the body of the last
572 * response.
573 */
574 public InputStream getLastResponseInputStream() {
575 return lastResponseInputStream;
576 }
577
578
579
580 /***
581 * Returns {@link HttpConnectionParams HTTP protocol parameters} associated with this method.
582 *
583 * @return HTTP parameters.
584 *
585 * @since 3.0
586 */
587 public HttpConnectionParams getParams() {
588 return this.params;
589 }
590
591 /***
592 * Assigns {@link HttpConnectionParams HTTP protocol parameters} for this method.
593 *
594 * @since 3.0
595 *
596 * @see HttpConnectionParams
597 */
598 public void setParams(final HttpConnectionParams params) {
599 if (params == null) {
600 throw new IllegalArgumentException("Parameters may not be null");
601 }
602 this.params = params;
603 }
604
605 /***
606 * Set the {@link Socket}'s timeout, via {@link Socket#setSoTimeout}. If the
607 * connection is already open, the SO_TIMEOUT is changed. If no connection
608 * is open, then subsequent connections will use the timeout value.
609 * <p>
610 * Note: This is not a connection timeout but a timeout on network traffic!
611 *
612 * @param timeout the timeout value
613 * @throws SocketException - if there is an error in the underlying
614 * protocol, such as a TCP error.
615 *
616 * @deprecated Use {@link HttpConnectionParams#setSoTimeout(int)},
617 * {@link HttpConnection#getParams()}.
618 */
619 public void setSoTimeout(int timeout)
620 throws SocketException, IllegalStateException {
621 this.params.setSoTimeout(timeout);
622 if (this.socket != null) {
623 this.socket.setSoTimeout(timeout);
624 }
625 }
626
627 /***
628 * Sets <code>SO_TIMEOUT</code> value directly on the underlying {@link Socket socket}.
629 * This method does not change the default read timeout value set via
630 * {@link HttpConnectionParams}.
631 *
632 * @param timeout the timeout value
633 * @throws SocketException - if there is an error in the underlying
634 * protocol, such as a TCP error.
635 * @throws IllegalStateException if not connected
636 *
637 * @since 3.0
638 */
639 public void setSocketTimeout(int timeout)
640 throws SocketException, IllegalStateException {
641 assertOpen();
642 if (this.socket != null) {
643 this.socket.setSoTimeout(timeout);
644 }
645 }
646
647 /***
648 * Returns the {@link Socket}'s timeout, via {@link Socket#getSoTimeout}, if the
649 * connection is already open. If no connection is open, return the value subsequent
650 * connection will use.
651 * <p>
652 * Note: This is not a connection timeout but a timeout on network traffic!
653 *
654 * @return the timeout value
655 *
656 * @deprecated Use {@link HttpConnectionParams#getSoTimeout()},
657 * {@link HttpConnection#getParams()}.
658 */
659 public int getSoTimeout() throws SocketException {
660 return this.params.getSoTimeout();
661 }
662
663 /***
664 * Sets the connection timeout. This is the maximum time that may be spent
665 * until a connection is established. The connection will fail after this
666 * amount of time.
667 * @param timeout The timeout in milliseconds. 0 means timeout is not used.
668 *
669 * @deprecated Use {@link HttpConnectionParams#setConnectionTimeout(int)},
670 * {@link HttpConnection#getParams()}.
671 */
672 public void setConnectionTimeout(int timeout) {
673 this.params.setConnectionTimeout(timeout);
674 }
675
676 /***
677 * Establishes a connection to the specified host and port
678 * (via a proxy if specified).
679 * The underlying socket is created from the {@link ProtocolSocketFactory}.
680 *
681 * @throws IOException if an attempt to establish the connection results in an
682 * I/O error.
683 */
684 public void open() throws IOException {
685 LOG.trace("enter HttpConnection.open()");
686
687 final String host = (proxyHostName == null) ? hostName : proxyHostName;
688 final int port = (proxyHostName == null) ? portNumber : proxyPortNumber;
689 assertNotOpen();
690
691 if (LOG.isDebugEnabled()) {
692 LOG.debug("Open connection to " + host + ":" + port);
693 }
694
695 try {
696 if (this.socket == null) {
697 usingSecureSocket = isSecure() && !isProxied();
698
699
700 final ProtocolSocketFactory socketFactory =
701 (isSecure() && isProxied()
702 ? new DefaultProtocolSocketFactory()
703 : protocolInUse.getSocketFactory());
704 this.socket = socketFactory.createSocket(
705 host, port,
706 localAddress, 0,
707 this.params);
708 }
709
710
711
712
713
714
715
716
717
718 socket.setTcpNoDelay(this.params.getTcpNoDelay());
719 socket.setSoTimeout(this.params.getSoTimeout());
720
721 int linger = this.params.getLinger();
722 if (linger >= 0) {
723 socket.setSoLinger(linger > 0, linger);
724 }
725
726 int sndBufSize = this.params.getSendBufferSize();
727 if (sndBufSize >= 0) {
728 socket.setSendBufferSize(sndBufSize);
729 }
730 int rcvBufSize = this.params.getReceiveBufferSize();
731 if (rcvBufSize >= 0) {
732 socket.setReceiveBufferSize(rcvBufSize);
733 }
734 int outbuffersize = socket.getSendBufferSize();
735 if ((outbuffersize > 2048) || (outbuffersize <= 0)) {
736 outbuffersize = 2048;
737 }
738 int inbuffersize = socket.getReceiveBufferSize();
739 if ((inbuffersize > 2048) || (inbuffersize <= 0)) {
740 inbuffersize = 2048;
741 }
742 inputStream = new BufferedInputStream(socket.getInputStream(), inbuffersize);
743 outputStream = new BufferedOutputStream(socket.getOutputStream(), outbuffersize);
744 isOpen = true;
745 } catch (IOException e) {
746
747
748 closeSocketAndStreams();
749 throw e;
750 }
751 }
752
753 /***
754 * Instructs the proxy to establish a secure tunnel to the host. The socket will
755 * be switched to the secure socket. Subsequent communication is done via the secure
756 * socket. The method can only be called once on a proxied secure connection.
757 *
758 * @throws IllegalStateException if connection is not secure and proxied or
759 * if the socket is already secure.
760 * @throws IOException if an attempt to establish the secure tunnel results in an
761 * I/O error.
762 */
763 public void tunnelCreated() throws IllegalStateException, IOException {
764 LOG.trace("enter HttpConnection.tunnelCreated()");
765
766 if (!isSecure() || !isProxied()) {
767 throw new IllegalStateException(
768 "Connection must be secure "
769 + "and proxied to use this feature");
770 }
771
772 if (usingSecureSocket) {
773 throw new IllegalStateException("Already using a secure socket");
774 }
775
776 if (LOG.isDebugEnabled()) {
777 LOG.debug("Secure tunnel to " + this.hostName + ":" + this.portNumber);
778 }
779
780 SecureProtocolSocketFactory socketFactory =
781 (SecureProtocolSocketFactory) protocolInUse.getSocketFactory();
782
783 socket = socketFactory.createSocket(socket, hostName, portNumber, true);
784 int sndBufSize = this.params.getSendBufferSize();
785 if (sndBufSize >= 0) {
786 socket.setSendBufferSize(sndBufSize);
787 }
788 int rcvBufSize = this.params.getReceiveBufferSize();
789 if (rcvBufSize >= 0) {
790 socket.setReceiveBufferSize(rcvBufSize);
791 }
792 int outbuffersize = socket.getSendBufferSize();
793 if (outbuffersize > 2048) {
794 outbuffersize = 2048;
795 }
796 int inbuffersize = socket.getReceiveBufferSize();
797 if (inbuffersize > 2048) {
798 inbuffersize = 2048;
799 }
800 inputStream = new BufferedInputStream(socket.getInputStream(), inbuffersize);
801 outputStream = new BufferedOutputStream(socket.getOutputStream(), outbuffersize);
802 usingSecureSocket = true;
803 tunnelEstablished = true;
804 }
805
806 /***
807 * Indicates if the connection is completely transparent from end to end.
808 *
809 * @return true if conncetion is not proxied or tunneled through a transparent
810 * proxy; false otherwise.
811 */
812 public boolean isTransparent() {
813 return !isProxied() || tunnelEstablished;
814 }
815
816 /***
817 * Flushes the output request stream. This method should be called to
818 * ensure that data written to the request OutputStream is sent to the server.
819 *
820 * @throws IOException if an I/O problem occurs
821 */
822 public void flushRequestOutputStream() throws IOException {
823 LOG.trace("enter HttpConnection.flushRequestOutputStream()");
824 assertOpen();
825 outputStream.flush();
826 }
827
828 /***
829 * Returns an {@link OutputStream} suitable for writing the request.
830 *
831 * @throws IllegalStateException if the connection is not open
832 * @throws IOException if an I/O problem occurs
833 * @return a stream to write the request to
834 */
835 public OutputStream getRequestOutputStream()
836 throws IOException, IllegalStateException {
837 LOG.trace("enter HttpConnection.getRequestOutputStream()");
838 assertOpen();
839 OutputStream out = this.outputStream;
840 if (Wire.CONTENT_WIRE.enabled()) {
841 out = new WireLogOutputStream(out, Wire.CONTENT_WIRE);
842 }
843 return out;
844 }
845
846 /***
847 * Return a {@link InputStream} suitable for reading the response.
848 * @return InputStream The response input stream.
849 * @throws IOException If an IO problem occurs
850 * @throws IllegalStateException If the connection isn't open.
851 */
852 public InputStream getResponseInputStream()
853 throws IOException, IllegalStateException {
854 LOG.trace("enter HttpConnection.getResponseInputStream()");
855 assertOpen();
856 return inputStream;
857 }
858
859 /***
860 * Tests if input data avaialble. This method returns immediately
861 * and does not perform any read operations on the input socket
862 *
863 * @return boolean <tt>true</tt> if input data is available,
864 * <tt>false</tt> otherwise.
865 *
866 * @throws IOException If an IO problem occurs
867 * @throws IllegalStateException If the connection isn't open.
868 */
869 public boolean isResponseAvailable()
870 throws IOException {
871 LOG.trace("enter HttpConnection.isResponseAvailable()");
872 assertOpen();
873 return this.inputStream.available() > 0;
874 }
875
876 /***
877 * Tests if input data becomes available within the given period time in milliseconds.
878 *
879 * @param timeout The number milliseconds to wait for input data to become available
880 * @return boolean <tt>true</tt> if input data is availble,
881 * <tt>false</tt> otherwise.
882 *
883 * @throws IOException If an IO problem occurs
884 * @throws IllegalStateException If the connection isn't open.
885 */
886 public boolean isResponseAvailable(int timeout)
887 throws IOException {
888 LOG.trace("enter HttpConnection.isResponseAvailable(int)");
889 assertOpen();
890 boolean result = false;
891 if (this.inputStream.available() > 0) {
892 result = true;
893 } else {
894 try {
895 this.socket.setSoTimeout(timeout);
896 inputStream.mark(1);
897 int byteRead = inputStream.read();
898 if (byteRead != -1) {
899 inputStream.reset();
900 LOG.debug("Input data available");
901 result = true;
902 } else {
903 LOG.debug("Input data not available");
904 }
905 } catch (InterruptedIOException e) {
906 if (!ExceptionUtil.isSocketTimeoutException(e)) {
907 throw e;
908 }
909 if (LOG.isDebugEnabled()) {
910 LOG.debug("Input data not available after " + timeout + " ms");
911 }
912 } finally {
913 try {
914 socket.setSoTimeout(this.params.getSoTimeout());
915 } catch (IOException ioe) {
916 LOG.debug("An error ocurred while resetting soTimeout, we will assume that"
917 + " no response is available.",
918 ioe);
919 result = false;
920 }
921 }
922 }
923 return result;
924 }
925
926 /***
927 * Writes the specified bytes to the output stream.
928 *
929 * @param data the data to be written
930 * @throws IllegalStateException if not connected
931 * @throws IOException if an I/O problem occurs
932 * @see #write(byte[],int,int)
933 */
934 public void write(byte[] data)
935 throws IOException, IllegalStateException {
936 LOG.trace("enter HttpConnection.write(byte[])");
937 this.write(data, 0, data.length);
938 }
939
940 /***
941 * Writes <i>length</i> bytes in <i>data</i> starting at
942 * <i>offset</i> to the output stream.
943 *
944 * The general contract for
945 * write(b, off, len) is that some of the bytes in the array b are written
946 * to the output stream in order; element b[off] is the first byte written
947 * and b[off+len-1] is the last byte written by this operation.
948 *
949 * @param data array containing the data to be written.
950 * @param offset the start offset in the data.
951 * @param length the number of bytes to write.
952 * @throws IllegalStateException if not connected
953 * @throws IOException if an I/O problem occurs
954 */
955 public void write(byte[] data, int offset, int length)
956 throws IOException, IllegalStateException {
957 LOG.trace("enter HttpConnection.write(byte[], int, int)");
958
959 if (offset < 0) {
960 throw new IllegalArgumentException("Array offset may not be negative");
961 }
962 if (length < 0) {
963 throw new IllegalArgumentException("Array length may not be negative");
964 }
965 if (offset + length > data.length) {
966 throw new IllegalArgumentException("Given offset and length exceed the array length");
967 }
968 assertOpen();
969 this.outputStream.write(data, offset, length);
970 }
971
972 /***
973 * Writes the specified bytes, followed by <tt>"\r\n".getBytes()</tt> to the
974 * output stream.
975 *
976 * @param data the bytes to be written
977 * @throws IllegalStateException if the connection is not open
978 * @throws IOException if an I/O problem occurs
979 */
980 public void writeLine(byte[] data)
981 throws IOException, IllegalStateException {
982 LOG.trace("enter HttpConnection.writeLine(byte[])");
983 write(data);
984 writeLine();
985 }
986
987 /***
988 * Writes <tt>"\r\n".getBytes()</tt> to the output stream.
989 *
990 * @throws IllegalStateException if the connection is not open
991 * @throws IOException if an I/O problem occurs
992 */
993 public void writeLine()
994 throws IOException, IllegalStateException {
995 LOG.trace("enter HttpConnection.writeLine()");
996 write(CRLF);
997 }
998
999 /***
1000 * @deprecated Use {@link #print(String, String)}
1001 *
1002 * Writes the specified String (as bytes) to the output stream.
1003 *
1004 * @param data the string to be written
1005 * @throws IllegalStateException if the connection is not open
1006 * @throws IOException if an I/O problem occurs
1007 */
1008 public void print(String data)
1009 throws IOException, IllegalStateException {
1010 LOG.trace("enter HttpConnection.print(String)");
1011 write(EncodingUtil.getBytes(data, "ISO-8859-1"));
1012 }
1013
1014 /***
1015 * Writes the specified String (as bytes) to the output stream.
1016 *
1017 * @param data the string to be written
1018 * @param charset the charset to use for writing the data
1019 * @throws IllegalStateException if the connection is not open
1020 * @throws IOException if an I/O problem occurs
1021 *
1022 * @since 3.0
1023 */
1024 public void print(String data, String charset)
1025 throws IOException, IllegalStateException {
1026 LOG.trace("enter HttpConnection.print(String)");
1027 write(EncodingUtil.getBytes(data, charset));
1028 }
1029
1030 /***
1031 * @deprecated Use {@link #printLine(String, String)}
1032 *
1033 * Writes the specified String (as bytes), followed by
1034 * <tt>"\r\n".getBytes()</tt> to the output stream.
1035 *
1036 * @param data the data to be written
1037 * @throws IllegalStateException if the connection is not open
1038 * @throws IOException if an I/O problem occurs
1039 */
1040 public void printLine(String data)
1041 throws IOException, IllegalStateException {
1042 LOG.trace("enter HttpConnection.printLine(String)");
1043 writeLine(EncodingUtil.getBytes(data, "ISO-8859-1"));
1044 }
1045
1046 /***
1047 * Writes the specified String (as bytes), followed by
1048 * <tt>"\r\n".getBytes()</tt> to the output stream.
1049 *
1050 * @param data the data to be written
1051 * @param charset the charset to use for writing the data
1052 * @throws IllegalStateException if the connection is not open
1053 * @throws IOException if an I/O problem occurs
1054 *
1055 * @since 3.0
1056 */
1057 public void printLine(String data, String charset)
1058 throws IOException, IllegalStateException {
1059 LOG.trace("enter HttpConnection.printLine(String)");
1060 writeLine(EncodingUtil.getBytes(data, charset));
1061 }
1062
1063 /***
1064 * Writes <tt>"\r\n".getBytes()</tt> to the output stream.
1065 *
1066 * @throws IllegalStateException if the connection is not open
1067 * @throws IOException if an I/O problem occurs
1068 */
1069 public void printLine()
1070 throws IOException, IllegalStateException {
1071 LOG.trace("enter HttpConnection.printLine()");
1072 writeLine();
1073 }
1074
1075 /***
1076 * Reads up to <tt>"\n"</tt> from the (unchunked) input stream.
1077 * If the stream ends before the line terminator is found,
1078 * the last part of the string will still be returned.
1079 *
1080 * @throws IllegalStateException if the connection is not open
1081 * @throws IOException if an I/O problem occurs
1082 * @return a line from the response
1083 *
1084 * @deprecated use #readLine(String)
1085 */
1086 public String readLine() throws IOException, IllegalStateException {
1087 LOG.trace("enter HttpConnection.readLine()");
1088
1089 assertOpen();
1090 return HttpParser.readLine(inputStream);
1091 }
1092
1093 /***
1094 * Reads up to <tt>"\n"</tt> from the (unchunked) input stream.
1095 * If the stream ends before the line terminator is found,
1096 * the last part of the string will still be returned.
1097 *
1098 * @param charset the charset to use for reading the data
1099 *
1100 * @throws IllegalStateException if the connection is not open
1101 * @throws IOException if an I/O problem occurs
1102 * @return a line from the response
1103 *
1104 * @since 3.0
1105 */
1106 public String readLine(final String charset) throws IOException, IllegalStateException {
1107 LOG.trace("enter HttpConnection.readLine()");
1108
1109 assertOpen();
1110 return HttpParser.readLine(inputStream, charset);
1111 }
1112
1113 /***
1114 * Attempts to shutdown the {@link Socket}'s output, via Socket.shutdownOutput()
1115 * when running on JVM 1.3 or higher.
1116 *
1117 * @deprecated unused
1118 */
1119 public void shutdownOutput() {
1120 LOG.trace("enter HttpConnection.shutdownOutput()");
1121
1122 try {
1123
1124
1125
1126 Class[] paramsClasses = new Class[0];
1127 Method shutdownOutput =
1128 socket.getClass().getMethod("shutdownOutput", paramsClasses);
1129 Object[] params = new Object[0];
1130 shutdownOutput.invoke(socket, params);
1131 } catch (Exception ex) {
1132 LOG.debug("Unexpected Exception caught", ex);
1133
1134 }
1135
1136 }
1137
1138 /***
1139 * Closes the socket and streams.
1140 */
1141 public void close() {
1142 LOG.trace("enter HttpConnection.close()");
1143 closeSocketAndStreams();
1144 }
1145
1146 /***
1147 * Returns the httpConnectionManager.
1148 * @return HttpConnectionManager
1149 */
1150 public HttpConnectionManager getHttpConnectionManager() {
1151 return httpConnectionManager;
1152 }
1153
1154 /***
1155 * Sets the httpConnectionManager.
1156 * @param httpConnectionManager The httpConnectionManager to set
1157 */
1158 public void setHttpConnectionManager(HttpConnectionManager httpConnectionManager) {
1159 this.httpConnectionManager = httpConnectionManager;
1160 }
1161
1162 /***
1163 * Releases the connection. If the connection is locked or does not have a connection
1164 * manager associated with it, this method has no effect. Note that it is completely safe
1165 * to call this method multiple times.
1166 */
1167 public void releaseConnection() {
1168 LOG.trace("enter HttpConnection.releaseConnection()");
1169 if (locked) {
1170 LOG.debug("Connection is locked. Call to releaseConnection() ignored.");
1171 } else if (httpConnectionManager != null) {
1172 LOG.debug("Releasing connection back to connection manager.");
1173 httpConnectionManager.releaseConnection(this);
1174 } else {
1175 LOG.warn("HttpConnectionManager is null. Connection cannot be released.");
1176 }
1177 }
1178
1179 /***
1180 * Tests if the connection is locked. Locked connections cannot be released.
1181 * An attempt to release a locked connection will have no effect.
1182 *
1183 * @return <tt>true</tt> if the connection is locked, <tt>false</tt> otherwise.
1184 *
1185 * @since 3.0
1186 */
1187 protected boolean isLocked() {
1188 return locked;
1189 }
1190
1191 /***
1192 * Locks or unlocks the connection. Locked connections cannot be released.
1193 * An attempt to release a locked connection will have no effect.
1194 *
1195 * @param locked <tt>true</tt> to lock the connection, <tt>false</tt> to unlock
1196 * the connection.
1197 *
1198 * @since 3.0
1199 */
1200 protected void setLocked(boolean locked) {
1201 this.locked = locked;
1202 }
1203
1204
1205 /***
1206 * Closes everything out.
1207 */
1208 protected void closeSocketAndStreams() {
1209 LOG.trace("enter HttpConnection.closeSockedAndStreams()");
1210
1211
1212 lastResponseInputStream = null;
1213
1214 if (null != outputStream) {
1215 OutputStream temp = outputStream;
1216 outputStream = null;
1217 try {
1218 temp.close();
1219 } catch (Exception ex) {
1220 LOG.debug("Exception caught when closing output", ex);
1221
1222 }
1223 }
1224
1225 if (null != inputStream) {
1226 InputStream temp = inputStream;
1227 inputStream = null;
1228 try {
1229 temp.close();
1230 } catch (Exception ex) {
1231 LOG.debug("Exception caught when closing input", ex);
1232
1233 }
1234 }
1235
1236 if (null != socket) {
1237 Socket temp = socket;
1238 socket = null;
1239 try {
1240 temp.close();
1241 } catch (Exception ex) {
1242 LOG.debug("Exception caught when closing socket", ex);
1243
1244 }
1245 }
1246 isOpen = false;
1247 tunnelEstablished = false;
1248 usingSecureSocket = false;
1249 }
1250
1251 /***
1252 * Throws an {@link IllegalStateException} if the connection is already open.
1253 *
1254 * @throws IllegalStateException if connected
1255 */
1256 protected void assertNotOpen() throws IllegalStateException {
1257 if (isOpen) {
1258 throw new IllegalStateException("Connection is open");
1259 }
1260 }
1261
1262 /***
1263 * Throws an {@link IllegalStateException} if the connection is not open.
1264 *
1265 * @throws IllegalStateException if not connected
1266 */
1267 protected void assertOpen() throws IllegalStateException {
1268 if (!isOpen) {
1269 throw new IllegalStateException("Connection is not open");
1270 }
1271 }
1272
1273 /***
1274 * Gets the socket's sendBufferSize.
1275 *
1276 * @return the size of the buffer for the socket OutputStream, -1 if the value
1277 * has not been set and the socket has not been opened
1278 *
1279 * @throws SocketException if an error occurs while getting the socket value
1280 *
1281 * @see Socket#getSendBufferSize()
1282 */
1283 public int getSendBufferSize() throws SocketException {
1284 if (socket == null) {
1285 return -1;
1286 } else {
1287 return socket.getSendBufferSize();
1288 }
1289 }
1290
1291 /***
1292 * Sets the socket's sendBufferSize.
1293 *
1294 * @param sendBufferSize the size to set for the socket OutputStream
1295 *
1296 * @throws SocketException if an error occurs while setting the socket value
1297 *
1298 * @see Socket#setSendBufferSize(int)
1299 *
1300 * @deprecated Use {@link HttpConnectionParams#setSendBufferSize(int)},
1301 * {@link HttpConnection#getParams()}.
1302 */
1303 public void setSendBufferSize(int sendBufferSize) throws SocketException {
1304 this.params.setSendBufferSize(sendBufferSize);
1305 }
1306
1307
1308
1309 /*** <tt>"\r\n"</tt>, as bytes. */
1310 private static final byte[] CRLF = new byte[] {(byte) 13, (byte) 10};
1311
1312 /*** Log object for this class. */
1313 private static final Log LOG = LogFactory.getLog(HttpConnection.class);
1314
1315
1316
1317 /*** My host. */
1318 private String hostName = null;
1319
1320 /*** My port. */
1321 private int portNumber = -1;
1322
1323 /*** My proxy host. */
1324 private String proxyHostName = null;
1325
1326 /*** My proxy port. */
1327 private int proxyPortNumber = -1;
1328
1329 /*** My client Socket. */
1330 private Socket socket = null;
1331
1332 /*** My InputStream. */
1333 private InputStream inputStream = null;
1334
1335 /*** My OutputStream. */
1336 private OutputStream outputStream = null;
1337
1338 /*** An {@link InputStream} for the response to an individual request. */
1339 private InputStream lastResponseInputStream = null;
1340
1341 /*** Whether or not the connection is connected. */
1342 protected boolean isOpen = false;
1343
1344 /*** the protocol being used */
1345 private Protocol protocolInUse;
1346
1347 /*** Collection of HTTP parameters associated with this HTTP connection*/
1348 private HttpConnectionParams params = new HttpConnectionParams();
1349
1350 /*** flag to indicate if this connection can be released, if locked the connection cannot be
1351 * released */
1352 private boolean locked = false;
1353
1354 /*** Whether or not the socket is a secure one. */
1355 private boolean usingSecureSocket = false;
1356
1357 /*** Whether the connection is open via a secure tunnel or not */
1358 private boolean tunnelEstablished = false;
1359
1360 /*** the connection manager that created this connection or null */
1361 private HttpConnectionManager httpConnectionManager;
1362
1363 /*** The local interface on which the connection is created, or null for the default */
1364 private InetAddress localAddress;
1365 }