The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package android.net.http; |
| 18 | |
| 19 | import android.content.Context; |
| 20 | import android.os.SystemClock; |
| 21 | |
| 22 | import java.io.IOException; |
| 23 | import java.net.UnknownHostException; |
| 24 | import java.util.ListIterator; |
| 25 | import java.util.LinkedList; |
| 26 | |
| 27 | import javax.net.ssl.SSLHandshakeException; |
| 28 | |
| 29 | import org.apache.http.ConnectionReuseStrategy; |
| 30 | import org.apache.http.HttpEntity; |
| 31 | import org.apache.http.HttpException; |
| 32 | import org.apache.http.HttpHost; |
| 33 | import org.apache.http.HttpVersion; |
| 34 | import org.apache.http.ParseException; |
| 35 | import org.apache.http.ProtocolVersion; |
| 36 | import org.apache.http.protocol.ExecutionContext; |
| 37 | import org.apache.http.protocol.HttpContext; |
| 38 | import org.apache.http.protocol.BasicHttpContext; |
| 39 | |
| 40 | /** |
| 41 | * {@hide} |
| 42 | */ |
| 43 | abstract class Connection { |
| 44 | |
| 45 | /** |
| 46 | * Allow a TCP connection 60 idle seconds before erroring out |
| 47 | */ |
| 48 | static final int SOCKET_TIMEOUT = 60000; |
| 49 | |
| 50 | private static final int SEND = 0; |
| 51 | private static final int READ = 1; |
| 52 | private static final int DRAIN = 2; |
| 53 | private static final int DONE = 3; |
| 54 | private static final String[] states = {"SEND", "READ", "DRAIN", "DONE"}; |
| 55 | |
| 56 | Context mContext; |
| 57 | |
| 58 | /** The low level connection */ |
| 59 | protected AndroidHttpClientConnection mHttpClientConnection = null; |
| 60 | |
| 61 | /** |
| 62 | * The server SSL certificate associated with this connection |
| 63 | * (null if the connection is not secure) |
| 64 | * It would be nice to store the whole certificate chain, but |
| 65 | * we want to keep things as light-weight as possible |
| 66 | */ |
| 67 | protected SslCertificate mCertificate = null; |
| 68 | |
| 69 | /** |
| 70 | * The host this connection is connected to. If using proxy, |
| 71 | * this is set to the proxy address |
| 72 | */ |
| 73 | HttpHost mHost; |
| 74 | |
| 75 | /** true if the connection can be reused for sending more requests */ |
| 76 | private boolean mCanPersist; |
| 77 | |
| 78 | /** context required by ConnectionReuseStrategy. */ |
| 79 | private HttpContext mHttpContext; |
| 80 | |
| 81 | /** set when cancelled */ |
| 82 | private static int STATE_NORMAL = 0; |
| 83 | private static int STATE_CANCEL_REQUESTED = 1; |
| 84 | private int mActive = STATE_NORMAL; |
| 85 | |
| 86 | /** The number of times to try to re-connect (if connect fails). */ |
| 87 | private final static int RETRY_REQUEST_LIMIT = 2; |
| 88 | |
| 89 | private static final int MIN_PIPE = 2; |
| 90 | private static final int MAX_PIPE = 3; |
| 91 | |
| 92 | /** |
| 93 | * Doesn't seem to exist anymore in the new HTTP client, so copied here. |
| 94 | */ |
| 95 | private static final String HTTP_CONNECTION = "http.connection"; |
| 96 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 97 | RequestFeeder mRequestFeeder; |
| 98 | |
| 99 | /** |
| 100 | * Buffer for feeding response blocks to webkit. One block per |
| 101 | * connection reduces memory churn. |
| 102 | */ |
| 103 | private byte[] mBuf; |
| 104 | |
| 105 | protected Connection(Context context, HttpHost host, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 106 | RequestFeeder requestFeeder) { |
| 107 | mContext = context; |
| 108 | mHost = host; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 109 | mRequestFeeder = requestFeeder; |
| 110 | |
| 111 | mCanPersist = false; |
| 112 | mHttpContext = new BasicHttpContext(null); |
| 113 | } |
| 114 | |
| 115 | HttpHost getHost() { |
| 116 | return mHost; |
| 117 | } |
| 118 | |
| 119 | /** |
| 120 | * connection factory: returns an HTTP or HTTPS connection as |
| 121 | * necessary |
| 122 | */ |
| 123 | static Connection getConnection( |
Patrick Scott | 86806ce1 | 2009-10-01 15:54:46 -0400 | [diff] [blame] | 124 | Context context, HttpHost host, HttpHost proxy, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 125 | RequestFeeder requestFeeder) { |
| 126 | |
| 127 | if (host.getSchemeName().equals("http")) { |
Patrick Scott | 86806ce1 | 2009-10-01 15:54:46 -0400 | [diff] [blame] | 128 | return new HttpConnection(context, host, requestFeeder); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 129 | } |
| 130 | |
| 131 | // Otherwise, default to https |
Patrick Scott | 86806ce1 | 2009-10-01 15:54:46 -0400 | [diff] [blame] | 132 | return new HttpsConnection(context, host, proxy, requestFeeder); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 133 | } |
| 134 | |
| 135 | /** |
| 136 | * @return The server SSL certificate associated with this |
| 137 | * connection (null if the connection is not secure) |
| 138 | */ |
| 139 | /* package */ SslCertificate getCertificate() { |
| 140 | return mCertificate; |
| 141 | } |
| 142 | |
| 143 | /** |
| 144 | * Close current network connection |
| 145 | * Note: this runs in non-network thread |
| 146 | */ |
| 147 | void cancel() { |
| 148 | mActive = STATE_CANCEL_REQUESTED; |
| 149 | closeConnection(); |
| 150 | if (HttpLog.LOGV) HttpLog.v( |
| 151 | "Connection.cancel(): connection closed " + mHost); |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * Process requests in queue |
| 156 | * pipelines requests |
| 157 | */ |
| 158 | void processRequests(Request firstRequest) { |
| 159 | Request req = null; |
| 160 | boolean empty; |
| 161 | int error = EventHandler.OK; |
| 162 | Exception exception = null; |
| 163 | |
| 164 | LinkedList<Request> pipe = new LinkedList<Request>(); |
| 165 | |
| 166 | int minPipe = MIN_PIPE, maxPipe = MAX_PIPE; |
| 167 | int state = SEND; |
| 168 | |
| 169 | while (state != DONE) { |
| 170 | if (HttpLog.LOGV) HttpLog.v( |
| 171 | states[state] + " pipe " + pipe.size()); |
| 172 | |
| 173 | /* If a request was cancelled, give other cancel requests |
| 174 | some time to go through so we don't uselessly restart |
| 175 | connections */ |
| 176 | if (mActive == STATE_CANCEL_REQUESTED) { |
| 177 | try { |
| 178 | Thread.sleep(100); |
| 179 | } catch (InterruptedException x) { /* ignore */ } |
| 180 | mActive = STATE_NORMAL; |
| 181 | } |
| 182 | |
| 183 | switch (state) { |
| 184 | case SEND: { |
| 185 | if (pipe.size() == maxPipe) { |
| 186 | state = READ; |
| 187 | break; |
| 188 | } |
| 189 | /* get a request */ |
| 190 | if (firstRequest == null) { |
| 191 | req = mRequestFeeder.getRequest(mHost); |
| 192 | } else { |
| 193 | req = firstRequest; |
| 194 | firstRequest = null; |
| 195 | } |
| 196 | if (req == null) { |
| 197 | state = DRAIN; |
| 198 | break; |
| 199 | } |
| 200 | req.setConnection(this); |
| 201 | |
| 202 | /* Don't work on cancelled requests. */ |
| 203 | if (req.mCancelled) { |
| 204 | if (HttpLog.LOGV) HttpLog.v( |
| 205 | "processRequests(): skipping cancelled request " |
| 206 | + req); |
| 207 | req.complete(); |
| 208 | break; |
| 209 | } |
| 210 | |
| 211 | if (mHttpClientConnection == null || |
| 212 | !mHttpClientConnection.isOpen()) { |
| 213 | /* If this call fails, the address is bad or |
| 214 | the net is down. Punt for now. |
| 215 | |
| 216 | FIXME: blow out entire queue here on |
| 217 | connection failure if net up? */ |
| 218 | |
| 219 | if (!openHttpConnection(req)) { |
| 220 | state = DONE; |
| 221 | break; |
| 222 | } |
| 223 | } |
| 224 | |
Brian Carlstrom | dba8cb7 | 2010-03-18 16:56:41 -0700 | [diff] [blame] | 225 | /* we have a connection, let the event handler |
| 226 | * know of any associated certificate, |
| 227 | * potentially none. |
| 228 | */ |
| 229 | req.mEventHandler.certificate(mCertificate); |
| 230 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 231 | try { |
| 232 | /* FIXME: don't increment failure count if old |
| 233 | connection? There should not be a penalty for |
| 234 | attempting to reuse an old connection */ |
| 235 | req.sendRequest(mHttpClientConnection); |
| 236 | } catch (HttpException e) { |
| 237 | exception = e; |
| 238 | error = EventHandler.ERROR; |
| 239 | } catch (IOException e) { |
| 240 | exception = e; |
| 241 | error = EventHandler.ERROR_IO; |
| 242 | } catch (IllegalStateException e) { |
| 243 | exception = e; |
| 244 | error = EventHandler.ERROR_IO; |
| 245 | } |
| 246 | if (exception != null) { |
| 247 | if (httpFailure(req, error, exception) && |
| 248 | !req.mCancelled) { |
| 249 | /* retry request if not permanent failure |
| 250 | or cancelled */ |
| 251 | pipe.addLast(req); |
| 252 | } |
| 253 | exception = null; |
Patrick Scott | aaebc86 | 2009-09-16 09:59:12 -0400 | [diff] [blame] | 254 | state = clearPipe(pipe) ? DONE : SEND; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 255 | minPipe = maxPipe = 1; |
| 256 | break; |
| 257 | } |
| 258 | |
| 259 | pipe.addLast(req); |
| 260 | if (!mCanPersist) state = READ; |
| 261 | break; |
| 262 | |
| 263 | } |
| 264 | case DRAIN: |
| 265 | case READ: { |
| 266 | empty = !mRequestFeeder.haveRequest(mHost); |
| 267 | int pipeSize = pipe.size(); |
| 268 | if (state != DRAIN && pipeSize < minPipe && |
| 269 | !empty && mCanPersist) { |
| 270 | state = SEND; |
| 271 | break; |
| 272 | } else if (pipeSize == 0) { |
| 273 | /* Done if no other work to do */ |
| 274 | state = empty ? DONE : SEND; |
| 275 | break; |
| 276 | } |
| 277 | |
| 278 | req = (Request)pipe.removeFirst(); |
| 279 | if (HttpLog.LOGV) HttpLog.v( |
| 280 | "processRequests() reading " + req); |
| 281 | |
| 282 | try { |
| 283 | req.readResponse(mHttpClientConnection); |
| 284 | } catch (ParseException e) { |
| 285 | exception = e; |
| 286 | error = EventHandler.ERROR_IO; |
| 287 | } catch (IOException e) { |
| 288 | exception = e; |
| 289 | error = EventHandler.ERROR_IO; |
| 290 | } catch (IllegalStateException e) { |
| 291 | exception = e; |
| 292 | error = EventHandler.ERROR_IO; |
| 293 | } |
| 294 | if (exception != null) { |
| 295 | if (httpFailure(req, error, exception) && |
| 296 | !req.mCancelled) { |
| 297 | /* retry request if not permanent failure |
| 298 | or cancelled */ |
| 299 | req.reset(); |
| 300 | pipe.addFirst(req); |
| 301 | } |
| 302 | exception = null; |
| 303 | mCanPersist = false; |
| 304 | } |
| 305 | if (!mCanPersist) { |
| 306 | if (HttpLog.LOGV) HttpLog.v( |
| 307 | "processRequests(): no persist, closing " + |
| 308 | mHost); |
| 309 | |
| 310 | closeConnection(); |
| 311 | |
| 312 | mHttpContext.removeAttribute(HTTP_CONNECTION); |
| 313 | clearPipe(pipe); |
| 314 | minPipe = maxPipe = 1; |
Patrick Scott | aaebc86 | 2009-09-16 09:59:12 -0400 | [diff] [blame] | 315 | state = SEND; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 316 | } |
| 317 | break; |
| 318 | } |
| 319 | } |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | /** |
| 324 | * After a send/receive failure, any pipelined requests must be |
| 325 | * cleared back to the mRequest queue |
| 326 | * @return true if mRequests is empty after pipe cleared |
| 327 | */ |
| 328 | private boolean clearPipe(LinkedList<Request> pipe) { |
| 329 | boolean empty = true; |
| 330 | if (HttpLog.LOGV) HttpLog.v( |
| 331 | "Connection.clearPipe(): clearing pipe " + pipe.size()); |
| 332 | synchronized (mRequestFeeder) { |
| 333 | Request tReq; |
| 334 | while (!pipe.isEmpty()) { |
| 335 | tReq = (Request)pipe.removeLast(); |
| 336 | if (HttpLog.LOGV) HttpLog.v( |
| 337 | "clearPipe() adding back " + mHost + " " + tReq); |
| 338 | mRequestFeeder.requeueRequest(tReq); |
| 339 | empty = false; |
| 340 | } |
Patrick Scott | 86806ce1 | 2009-10-01 15:54:46 -0400 | [diff] [blame] | 341 | if (empty) empty = !mRequestFeeder.haveRequest(mHost); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 342 | } |
| 343 | return empty; |
| 344 | } |
| 345 | |
| 346 | /** |
| 347 | * @return true on success |
| 348 | */ |
| 349 | private boolean openHttpConnection(Request req) { |
| 350 | |
| 351 | long now = SystemClock.uptimeMillis(); |
| 352 | int error = EventHandler.OK; |
| 353 | Exception exception = null; |
| 354 | |
| 355 | try { |
| 356 | // reset the certificate to null before opening a connection |
| 357 | mCertificate = null; |
| 358 | mHttpClientConnection = openConnection(req); |
| 359 | if (mHttpClientConnection != null) { |
| 360 | mHttpClientConnection.setSocketTimeout(SOCKET_TIMEOUT); |
| 361 | mHttpContext.setAttribute(HTTP_CONNECTION, |
| 362 | mHttpClientConnection); |
| 363 | } else { |
| 364 | // we tried to do SSL tunneling, failed, |
| 365 | // and need to drop the request; |
| 366 | // we have already informed the handler |
| 367 | req.mFailCount = RETRY_REQUEST_LIMIT; |
| 368 | return false; |
| 369 | } |
| 370 | } catch (UnknownHostException e) { |
| 371 | if (HttpLog.LOGV) HttpLog.v("Failed to open connection"); |
| 372 | error = EventHandler.ERROR_LOOKUP; |
| 373 | exception = e; |
| 374 | } catch (IllegalArgumentException e) { |
| 375 | if (HttpLog.LOGV) HttpLog.v("Illegal argument exception"); |
| 376 | error = EventHandler.ERROR_CONNECT; |
| 377 | req.mFailCount = RETRY_REQUEST_LIMIT; |
| 378 | exception = e; |
| 379 | } catch (SSLConnectionClosedByUserException e) { |
| 380 | // hack: if we have an SSL connection failure, |
| 381 | // we don't want to reconnect |
| 382 | req.mFailCount = RETRY_REQUEST_LIMIT; |
| 383 | // no error message |
| 384 | return false; |
| 385 | } catch (SSLHandshakeException e) { |
| 386 | // hack: if we have an SSL connection failure, |
| 387 | // we don't want to reconnect |
| 388 | req.mFailCount = RETRY_REQUEST_LIMIT; |
| 389 | if (HttpLog.LOGV) HttpLog.v( |
| 390 | "SSL exception performing handshake"); |
| 391 | error = EventHandler.ERROR_FAILED_SSL_HANDSHAKE; |
| 392 | exception = e; |
| 393 | } catch (IOException e) { |
| 394 | error = EventHandler.ERROR_CONNECT; |
| 395 | exception = e; |
| 396 | } |
| 397 | |
| 398 | if (HttpLog.LOGV) { |
| 399 | long now2 = SystemClock.uptimeMillis(); |
| 400 | HttpLog.v("Connection.openHttpConnection() " + |
| 401 | (now2 - now) + " " + mHost); |
| 402 | } |
| 403 | |
| 404 | if (error == EventHandler.OK) { |
| 405 | return true; |
| 406 | } else { |
Patrick Scott | aaebc86 | 2009-09-16 09:59:12 -0400 | [diff] [blame] | 407 | if (req.mFailCount < RETRY_REQUEST_LIMIT) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 408 | // requeue |
| 409 | mRequestFeeder.requeueRequest(req); |
| 410 | req.mFailCount++; |
| 411 | } else { |
| 412 | httpFailure(req, error, exception); |
| 413 | } |
| 414 | return error == EventHandler.OK; |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | /** |
| 419 | * Helper. Calls the mEventHandler's error() method only if |
| 420 | * request failed permanently. Increments mFailcount on failure. |
| 421 | * |
| 422 | * Increments failcount only if the network is believed to be |
| 423 | * connected |
| 424 | * |
| 425 | * @return true if request can be retried (less than |
| 426 | * RETRY_REQUEST_LIMIT failures have occurred). |
| 427 | */ |
| 428 | private boolean httpFailure(Request req, int errorId, Exception e) { |
| 429 | boolean ret = true; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 430 | |
| 431 | // e.printStackTrace(); |
| 432 | if (HttpLog.LOGV) HttpLog.v( |
| 433 | "httpFailure() ******* " + e + " count " + req.mFailCount + |
Patrick Scott | aaebc86 | 2009-09-16 09:59:12 -0400 | [diff] [blame] | 434 | " " + mHost + " " + req.getUri()); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 435 | |
Patrick Scott | aaebc86 | 2009-09-16 09:59:12 -0400 | [diff] [blame] | 436 | if (++req.mFailCount >= RETRY_REQUEST_LIMIT) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 437 | ret = false; |
| 438 | String error; |
| 439 | if (errorId < 0) { |
Iain Merrick | 83d4a23 | 2010-11-12 14:11:16 +0000 | [diff] [blame] | 440 | error = ErrorStrings.getString(errorId, mContext); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 441 | } else { |
| 442 | Throwable cause = e.getCause(); |
| 443 | error = cause != null ? cause.toString() : e.getMessage(); |
| 444 | } |
| 445 | req.mEventHandler.error(errorId, error); |
| 446 | req.complete(); |
| 447 | } |
| 448 | |
| 449 | closeConnection(); |
| 450 | mHttpContext.removeAttribute(HTTP_CONNECTION); |
| 451 | |
| 452 | return ret; |
| 453 | } |
| 454 | |
| 455 | HttpContext getHttpContext() { |
| 456 | return mHttpContext; |
| 457 | } |
| 458 | |
| 459 | /** |
| 460 | * Use same logic as ConnectionReuseStrategy |
| 461 | * @see ConnectionReuseStrategy |
| 462 | */ |
| 463 | private boolean keepAlive(HttpEntity entity, |
| 464 | ProtocolVersion ver, int connType, final HttpContext context) { |
| 465 | org.apache.http.HttpConnection conn = (org.apache.http.HttpConnection) |
| 466 | context.getAttribute(ExecutionContext.HTTP_CONNECTION); |
| 467 | |
| 468 | if (conn != null && !conn.isOpen()) |
| 469 | return false; |
| 470 | // do NOT check for stale connection, that is an expensive operation |
| 471 | |
| 472 | if (entity != null) { |
| 473 | if (entity.getContentLength() < 0) { |
| 474 | if (!entity.isChunked() || ver.lessEquals(HttpVersion.HTTP_1_0)) { |
| 475 | // if the content length is not known and is not chunk |
| 476 | // encoded, the connection cannot be reused |
| 477 | return false; |
| 478 | } |
| 479 | } |
| 480 | } |
| 481 | // Check for 'Connection' directive |
| 482 | if (connType == Headers.CONN_CLOSE) { |
| 483 | return false; |
| 484 | } else if (connType == Headers.CONN_KEEP_ALIVE) { |
| 485 | return true; |
| 486 | } |
| 487 | // Resorting to protocol version default close connection policy |
| 488 | return !ver.lessEquals(HttpVersion.HTTP_1_0); |
| 489 | } |
| 490 | |
| 491 | void setCanPersist(HttpEntity entity, ProtocolVersion ver, int connType) { |
| 492 | mCanPersist = keepAlive(entity, ver, connType, mHttpContext); |
| 493 | } |
| 494 | |
| 495 | void setCanPersist(boolean canPersist) { |
| 496 | mCanPersist = canPersist; |
| 497 | } |
| 498 | |
| 499 | boolean getCanPersist() { |
| 500 | return mCanPersist; |
| 501 | } |
| 502 | |
| 503 | /** typically http or https... set by subclass */ |
| 504 | abstract String getScheme(); |
| 505 | abstract void closeConnection(); |
| 506 | abstract AndroidHttpClientConnection openConnection(Request req) throws IOException; |
| 507 | |
| 508 | /** |
| 509 | * Prints request queue to log, for debugging. |
| 510 | * returns request count |
| 511 | */ |
| 512 | public synchronized String toString() { |
| 513 | return mHost.toString(); |
| 514 | } |
| 515 | |
| 516 | byte[] getBuf() { |
| 517 | if (mBuf == null) mBuf = new byte[8192]; |
| 518 | return mBuf; |
| 519 | } |
| 520 | |
| 521 | } |