Java tutorial
/** * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package crawlercommons.fetcher; import java.io.ByteArrayOutputStream; import java.io.Closeable; import java.io.IOException; import java.io.InputStream; import java.net.MalformedURLException; import java.net.URI; import java.net.URISyntaxException; import java.net.URL; import java.security.KeyStore; import java.security.KeyStoreException; import java.security.NoSuchAlgorithmException; import java.security.cert.CertificateException; import java.security.cert.X509Certificate; import java.util.HashSet; import java.util.Set; import java.util.concurrent.TimeUnit; import javax.net.ssl.SSLContext; import javax.net.ssl.SSLException; import javax.net.ssl.SSLHandshakeException; import javax.net.ssl.TrustManager; import javax.net.ssl.TrustManagerFactory; import javax.net.ssl.X509TrustManager; import org.apache.http.Header; import org.apache.http.HttpEntity; import org.apache.http.HttpEntityEnclosingRequest; import org.apache.http.HttpException; import org.apache.http.HttpHeaders; import org.apache.http.HttpHost; import org.apache.http.HttpInetConnection; import org.apache.http.HttpRequest; import org.apache.http.HttpRequestInterceptor; import org.apache.http.HttpResponse; import org.apache.http.HttpStatus; import org.apache.http.HttpVersion; import org.apache.http.NoHttpResponseException; import org.apache.http.ProtocolException; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.CookieStore; import org.apache.http.client.HttpRequestRetryHandler; import org.apache.http.client.RedirectException; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpRequestBase; import org.apache.http.client.methods.HttpUriRequest; import org.apache.http.client.params.ClientParamBean; import org.apache.http.client.params.CookiePolicy; import org.apache.http.client.params.HttpClientParams; import org.apache.http.client.protocol.ClientContext; import org.apache.http.conn.ConnectionPoolTimeoutException; import org.apache.http.conn.params.ConnManagerParams; import org.apache.http.conn.params.ConnPerRouteBean; import org.apache.http.conn.scheme.PlainSocketFactory; import org.apache.http.conn.scheme.Scheme; import org.apache.http.conn.scheme.SchemeRegistry; import org.apache.http.conn.ssl.AbstractVerifier; import org.apache.http.conn.ssl.SSLSocketFactory; import org.apache.http.cookie.params.CookieSpecParamBean; import org.apache.http.impl.client.BasicCookieStore; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.impl.client.DefaultRedirectHandler; import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager; import org.apache.http.message.BasicHeader; import org.apache.http.params.BasicHttpParams; import org.apache.http.params.HttpConnectionParams; import org.apache.http.params.HttpParams; import org.apache.http.params.HttpProtocolParams; import org.apache.http.protocol.BasicHttpContext; import org.apache.http.protocol.ExecutionContext; import org.apache.http.protocol.HttpContext; import org.apache.tika.metadata.Metadata; import org.apache.tika.mime.MediaType; import org.apache.tika.parser.ParseContext; import org.apache.tika.parser.Parser; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import crawlercommons.fetcher.EncodingUtils.ExpandedResult; import crawlercommons.fetcher.RedirectFetchException.RedirectExceptionReason; @SuppressWarnings("serial") public class SimpleHttpFetcher extends BaseFetcher { private static Logger LOGGER = LoggerFactory.getLogger(SimpleHttpFetcher.class); // We tried 10 seconds for all of these, but got a number of connection/read timeouts for // sites that would have eventually worked, so bumping it up to 30 seconds. private static final int DEFAULT_SOCKET_TIMEOUT = 30 * 1000; private static final int DEFAULT_CONNECTION_TIMEOUT = 30 * 1000; private static final int DEFAULT_MAX_THREADS = 1; // This normally don't ever hit this timeout, since we manage the number of // fetcher threads to be <= the maxThreads value used to configure an IHttpFetcher. // But the limit of connections/host can cause a timeout, when redirects cause // multiple threads to hit the same domain. So jack the value way up. private static final long CONNECTION_POOL_TIMEOUT = 100 * 1000L; private static final int BUFFER_SIZE = 8 * 1024; private static final int DEFAULT_MAX_RETRY_COUNT = 10; private static final int DEFAULT_BYTEARRAY_SIZE = 32 * 1024; // Use the same values as Firefox (except that we don't accept deflate, // which we're not sure is implemented correctly - see the notes in // EncodingUtils/EncodingUtilsTest for more details). private static final String DEFAULT_ACCEPT = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"; private static final String DEFAULT_ACCEPT_CHARSET = "utf-8,ISO-8859-1;q=0.7,*;q=0.7"; private static final String DEFAULT_ACCEPT_ENCODING = "x-gzip, gzip"; // Keys used to access data in the Http execution context. private static final String PERM_REDIRECT_CONTEXT_KEY = "perm-redirect"; private static final String REDIRECT_COUNT_CONTEXT_KEY = "redirect-count"; private static final String HOST_ADDRESS = "host-address"; private static final String SSL_CONTEXT_NAMES[] = { "TLS", "Default", "SSL", }; private static final String TEXT_MIME_TYPES[] = { "text/html", "application/x-asp", "application/xhtml+xml", "application/vnd.wap.xhtml+xml", }; private HttpVersion _httpVersion; private int _socketTimeout; private int _connectionTimeout; private int _maxRetryCount; transient private DefaultHttpClient _httpClient; private static class MyRequestRetryHandler implements HttpRequestRetryHandler { private int _maxRetryCount; public MyRequestRetryHandler(int maxRetryCount) { _maxRetryCount = maxRetryCount; } @Override public boolean retryRequest(IOException exception, int executionCount, HttpContext context) { if (LOGGER.isTraceEnabled()) { LOGGER.trace("Decide about retry #" + executionCount + " for exception " + exception.getMessage()); } if (executionCount >= _maxRetryCount) { // Do not retry if over max retry count return false; } else if (exception instanceof NoHttpResponseException) { // Retry if the server dropped connection on us return true; } else if (exception instanceof SSLHandshakeException) { // Do not retry on SSL handshake exception return false; } HttpRequest request = (HttpRequest) context.getAttribute(ExecutionContext.HTTP_REQUEST); boolean idempotent = !(request instanceof HttpEntityEnclosingRequest); // Retry if the request is considered idempotent return idempotent; } } private static class MyRedirectException extends RedirectException { private URI _uri; private RedirectExceptionReason _reason; public MyRedirectException(String message, URI uri, RedirectExceptionReason reason) { super(message); _uri = uri; _reason = reason; } public URI getUri() { return _uri; } public RedirectExceptionReason getReason() { return _reason; } } /** * Handler to record last permanent redirect (if any) in context. * */ private static class MyRedirectHandler extends DefaultRedirectHandler { private RedirectMode _redirectMode; public MyRedirectHandler(RedirectMode redirectMode) { super(); _redirectMode = redirectMode; } @Override public URI getLocationURI(HttpResponse response, HttpContext context) throws ProtocolException { URI result = super.getLocationURI(response, context); // HACK - some sites return a redirect with an explicit port number that's the same as // the default port (e.g. 80 for http), and then when you use this to make the next // request, the presence of the port in the domain triggers another redirect, so you // fail with a circular redirect error. Avoid that by converting the port number to // -1 in that case. if (result.getScheme().equalsIgnoreCase("http") && (result.getPort() == 80)) { try { result = new URI(result.getScheme(), result.getUserInfo(), result.getHost(), -1, result.getPath(), result.getQuery(), result.getFragment()); } catch (URISyntaxException e) { LOGGER.warn("Unexpected exception removing port from URI", e); } } // Keep track of the number of redirects. Integer count = (Integer) context.getAttribute(REDIRECT_COUNT_CONTEXT_KEY); if (count == null) { count = new Integer(0); } context.setAttribute(REDIRECT_COUNT_CONTEXT_KEY, count + 1); // Record the last permanent redirect int statusCode = response.getStatusLine().getStatusCode(); if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY) { context.setAttribute(PERM_REDIRECT_CONTEXT_KEY, result); } // Based on the redirect mode, decide how we want to handle this. boolean isPermRedirect = statusCode == HttpStatus.SC_MOVED_PERMANENTLY; if ((_redirectMode == RedirectMode.FOLLOW_NONE) || ((_redirectMode == RedirectMode.FOLLOW_TEMP) && isPermRedirect)) { RedirectExceptionReason reason = isPermRedirect ? RedirectExceptionReason.PERM_REDIRECT_DISALLOWED : RedirectExceptionReason.TEMP_REDIRECT_DISALLOWED; throw new MyRedirectException("RedirectMode disallowed redirect: " + _redirectMode, result, reason); } return result; } } /** * Interceptor to record host address in context. * */ private static class MyRequestInterceptor implements HttpRequestInterceptor { @Override public void process(HttpRequest request, HttpContext context) throws HttpException, IOException { HttpInetConnection connection = (HttpInetConnection) (context .getAttribute(ExecutionContext.HTTP_CONNECTION)); context.setAttribute(HOST_ADDRESS, connection.getRemoteAddress().getHostAddress()); } } private static class DummyX509HostnameVerifier extends AbstractVerifier { @Override public void verify(String host, String[] cns, String[] subjectAlts) throws SSLException { try { verify(host, cns, subjectAlts, false); } catch (SSLException e) { LOGGER.warn("Invalid SSL certificate for " + host + ": " + e.getMessage()); } } @Override public final String toString() { return "DUMMY_VERIFIER"; } } private static class DummyX509TrustManager implements X509TrustManager { private X509TrustManager standardTrustManager = null; /** * Constructor for DummyX509TrustManager. */ public DummyX509TrustManager(KeyStore keystore) throws NoSuchAlgorithmException, KeyStoreException { super(); String algo = TrustManagerFactory.getDefaultAlgorithm(); TrustManagerFactory factory = TrustManagerFactory.getInstance(algo); factory.init(keystore); TrustManager[] trustmanagers = factory.getTrustManagers(); if (trustmanagers.length == 0) { throw new NoSuchAlgorithmException(algo + " trust manager not supported"); } this.standardTrustManager = (X509TrustManager) trustmanagers[0]; } /** * @see javax.net.ssl.X509TrustManager#checkClientTrusted(X509Certificate[], String) */ public boolean isClientTrusted(X509Certificate[] certificates) { return true; } /** * @see javax.net.ssl.X509TrustManager#checkServerTrusted(X509Certificate[], String) */ public boolean isServerTrusted(X509Certificate[] certificates) { return true; } /** * @see javax.net.ssl.X509TrustManager#getAcceptedIssuers() */ public X509Certificate[] getAcceptedIssuers() { return this.standardTrustManager.getAcceptedIssuers(); } public void checkClientTrusted(X509Certificate[] arg0, String arg1) throws CertificateException { // do nothing } public void checkServerTrusted(X509Certificate[] arg0, String arg1) throws CertificateException { // do nothing } } public SimpleHttpFetcher(UserAgent userAgent) { this(DEFAULT_MAX_THREADS, userAgent); } public SimpleHttpFetcher(int maxThreads, UserAgent userAgent) { super(maxThreads, userAgent); _httpVersion = HttpVersion.HTTP_1_1; _socketTimeout = DEFAULT_SOCKET_TIMEOUT; _connectionTimeout = DEFAULT_CONNECTION_TIMEOUT; _maxRetryCount = DEFAULT_MAX_RETRY_COUNT; // Just to be explicit, we rely on lazy initialization of this so that // we don't have to worry about serializing it. _httpClient = null; } public HttpVersion getHttpVersion() { return _httpVersion; } public void setHttpVersion(HttpVersion httpVersion) { if (_httpClient == null) { _httpVersion = httpVersion; } else { throw new IllegalStateException("Can't change HTTP version after HttpClient has been initialized"); } } public int getSocketTimeout() { return _socketTimeout; } public void setSocketTimeout(int socketTimeoutInMs) { if (_httpClient == null) { _socketTimeout = socketTimeoutInMs; } else { throw new IllegalStateException("Can't change socket timeout after HttpClient has been initialized"); } } public int getConnectionTimeout() { return _connectionTimeout; } public void setConnectionTimeout(int connectionTimeoutInMs) { if (_httpClient == null) { _connectionTimeout = connectionTimeoutInMs; } else { throw new IllegalStateException( "Can't change connection timeout after HttpClient has been initialized"); } } public int getMaxRetryCount() { return _maxRetryCount; } public void setMaxRetryCount(int maxRetryCount) { _maxRetryCount = maxRetryCount; } @Override public FetchedResult get(String url, Payload payload) throws BaseFetchException { return request(new HttpGet(), url, payload); } private FetchedResult request(HttpRequestBase request, String url, Payload payload) throws BaseFetchException { init(); try { return doRequest(request, url, payload); } catch (HttpFetchException e) { // Don't bother generating a trace for a 404 (not found) if (LOGGER.isTraceEnabled() && (e.getHttpStatus() != HttpStatus.SC_NOT_FOUND)) { LOGGER.trace(String.format("Exception fetching %s (%s)", url, e.getMessage())); } throw e; } catch (AbortedFetchException e) { // Don't bother reporting that we bailed because the mime-type wasn't one that we wanted. if (e.getAbortReason() != AbortedFetchReason.INVALID_MIMETYPE) { LOGGER.debug(String.format("Exception fetching %s (%s)", url, e.getMessage())); } throw e; } catch (BaseFetchException e) { LOGGER.debug(String.format("Exception fetching %s (%s)", url, e.getMessage())); throw e; } } public FetchedResult fetch(String url) throws BaseFetchException { return fetch(new HttpGet(), url, new Payload()); } public FetchedResult fetch(HttpRequestBase request, String url, Payload payload) throws BaseFetchException { init(); try { return doRequest(request, url, payload); } catch (BaseFetchException e) { if (LOGGER.isTraceEnabled()) { LOGGER.trace(String.format("Exception fetching %s", url), e); } throw e; } } private FetchedResult doRequest(HttpRequestBase request, String url, Payload payload) throws BaseFetchException { LOGGER.trace("Fetching " + url); HttpResponse response; long readStartTime; Metadata headerMap = new Metadata(); String redirectedUrl = null; String newBaseUrl = null; int numRedirects = 0; boolean needAbort = true; String contentType = ""; String mimeType = ""; String hostAddress = null; // Create a local instance of cookie store, and bind to local context // Without this we get killed w/lots of threads, due to sync() on single cookie store. HttpContext localContext = new BasicHttpContext(); CookieStore cookieStore = new BasicCookieStore(); localContext.setAttribute(ClientContext.COOKIE_STORE, cookieStore); StringBuilder fetchTrace = null; if (LOGGER.isTraceEnabled()) { fetchTrace = new StringBuilder("Fetched url: " + url); } try { request.setURI(new URI(url)); readStartTime = System.currentTimeMillis(); response = _httpClient.execute(request, localContext); Header[] headers = response.getAllHeaders(); for (Header header : headers) { headerMap.add(header.getName(), header.getValue()); } int httpStatus = response.getStatusLine().getStatusCode(); if (LOGGER.isTraceEnabled()) { fetchTrace.append("; status code: " + httpStatus); if (headerMap.get(HttpHeaders.CONTENT_LENGTH) != null) { fetchTrace.append("; Content-Length: " + headerMap.get(HttpHeaders.CONTENT_LENGTH)); } if (headerMap.get(HttpHeaders.LOCATION) != null) { fetchTrace.append("; Location: " + headerMap.get(HttpHeaders.LOCATION)); } } if ((httpStatus < 200) || (httpStatus >= 300)) { // We can't just check against SC_OK, as some wackos return 201, 202, etc throw new HttpFetchException(url, "Error fetching " + url, httpStatus, headerMap); } redirectedUrl = extractRedirectedUrl(url, localContext); URI permRedirectUri = (URI) localContext.getAttribute(PERM_REDIRECT_CONTEXT_KEY); if (permRedirectUri != null) { newBaseUrl = permRedirectUri.toURL().toExternalForm(); } Integer redirects = (Integer) localContext.getAttribute(REDIRECT_COUNT_CONTEXT_KEY); if (redirects != null) { numRedirects = redirects.intValue(); } hostAddress = (String) (localContext.getAttribute(HOST_ADDRESS)); if (hostAddress == null) { throw new UrlFetchException(url, "Host address not saved in context"); } Header cth = response.getFirstHeader(HttpHeaders.CONTENT_TYPE); if (cth != null) { contentType = cth.getValue(); } // Check if we should abort due to mime-type filtering. Note that this will fail if the server // doesn't report a mime-type, but that's how we want it as this configuration is typically // used when only a subset of parsers are installed/enabled, so we don't want the auto-detect // code in Tika to get triggered & try to process an unsupported type. If you want unknown // mime-types from the server to be processed, set "" as one of the valid mime-types in FetcherPolicy. mimeType = getMimeTypeFromContentType(contentType); Set<String> mimeTypes = getValidMimeTypes(); if ((mimeTypes != null) && (mimeTypes.size() > 0)) { if (!mimeTypes.contains(mimeType)) { throw new AbortedFetchException(url, "Invalid mime-type: " + mimeType, AbortedFetchReason.INVALID_MIMETYPE); } } needAbort = false; } catch (ClientProtocolException e) { // Oleg guarantees that no abort is needed in the case of an IOException (which is is a subclass of) needAbort = false; // If the root case was a "too many redirects" error, we want to map this to a specific // exception that contains the final redirect. if (e.getCause() instanceof MyRedirectException) { MyRedirectException mre = (MyRedirectException) e.getCause(); String redirectUrl = url; try { redirectUrl = mre.getUri().toURL().toExternalForm(); } catch (MalformedURLException e2) { LOGGER.warn("Invalid URI saved during redirect handling: " + mre.getUri()); } throw new RedirectFetchException(url, redirectUrl, mre.getReason()); } else if (e.getCause() instanceof RedirectException) { throw new RedirectFetchException(url, extractRedirectedUrl(url, localContext), RedirectExceptionReason.TOO_MANY_REDIRECTS); } else { throw new IOFetchException(url, e); } } catch (IOException e) { // Oleg guarantees that no abort is needed in the case of an IOException needAbort = false; if (e instanceof ConnectionPoolTimeoutException) { // Should never happen, so let's dump some info about the connection pool. ThreadSafeClientConnManager cm = (ThreadSafeClientConnManager) _httpClient.getConnectionManager(); int numConnections = cm.getConnectionsInPool(); cm.closeIdleConnections(0, TimeUnit.MILLISECONDS); LOGGER.error(String.format( "Got ConnectionPoolTimeoutException: %d connections before, %d after idle close", numConnections, cm.getConnectionsInPool())); } throw new IOFetchException(url, e); } catch (URISyntaxException e) { throw new UrlFetchException(url, e.getMessage()); } catch (IllegalStateException e) { throw new UrlFetchException(url, e.getMessage()); } catch (BaseFetchException e) { throw e; } catch (Exception e) { // Map anything else to a generic IOFetchException // TODO KKr - create generic fetch exception throw new IOFetchException(url, new IOException(e)); } finally { safeAbort(needAbort, request); } // Figure out how much data we want to try to fetch. int maxContentSize = getMaxContentSize(mimeType); int targetLength = maxContentSize; boolean truncated = false; String contentLengthStr = headerMap.get(HttpHeaders.CONTENT_LENGTH); if (contentLengthStr != null) { try { int contentLength = Integer.parseInt(contentLengthStr); if (contentLength > targetLength) { truncated = true; } else { targetLength = contentLength; } } catch (NumberFormatException e) { // Ignore (and log) invalid content length values. LOGGER.warn("Invalid content length in header: " + contentLengthStr); } } // Now finally read in response body, up to targetLength bytes. // Note that entity might be null, for zero length responses. byte[] content = new byte[0]; long readRate = 0; HttpEntity entity = response.getEntity(); needAbort = true; if (entity != null) { InputStream in = null; try { in = entity.getContent(); byte[] buffer = new byte[BUFFER_SIZE]; int bytesRead = 0; int totalRead = 0; ByteArrayOutputStream out = new ByteArrayOutputStream(DEFAULT_BYTEARRAY_SIZE); int readRequests = 0; int minResponseRate = getMinResponseRate(); // TODO KKr - we need to monitor the rate while reading a // single block. Look at HttpClient // metrics support for how to do this. Once we fix this, fix // the test to read a smaller (< 20K) // chuck of data. while ((totalRead < targetLength) && ((bytesRead = in.read(buffer, 0, Math.min(buffer.length, targetLength - totalRead))) != -1)) { readRequests += 1; totalRead += bytesRead; out.write(buffer, 0, bytesRead); // Assume read time is at least one millisecond, to avoid DBZ exception. long totalReadTime = Math.max(1, System.currentTimeMillis() - readStartTime); readRate = (totalRead * 1000L) / totalReadTime; // Don't bail on the first read cycle, as we can get a hiccup starting out. // Also don't bail if we've read everything we need. if ((readRequests > 1) && (totalRead < targetLength) && (readRate < minResponseRate)) { throw new AbortedFetchException(url, "Slow response rate of " + readRate + " bytes/sec", AbortedFetchReason.SLOW_RESPONSE_RATE); } // Check to see if we got interrupted. if (Thread.interrupted()) { throw new AbortedFetchException(url, AbortedFetchReason.INTERRUPTED); } } content = out.toByteArray(); needAbort = truncated || (in.available() > 0); } catch (IOException e) { // We don't need to abort if there's an IOException throw new IOFetchException(url, e); } finally { safeAbort(needAbort, request); safeClose(in); } } // Toss truncated image content. if ((truncated) && (!isTextMimeType(mimeType))) { throw new AbortedFetchException(url, "Truncated image", AbortedFetchReason.CONTENT_SIZE); } // Now see if we need to uncompress the content. String contentEncoding = headerMap.get(HttpHeaders.CONTENT_ENCODING); if (contentEncoding != null) { if (LOGGER.isTraceEnabled()) { fetchTrace.append("; Content-Encoding: " + contentEncoding); } // TODO KKr We might want to just decompress a truncated gzip // containing text (since we have a max content size to save us // from any gzip corruption). We might want to break the following // out into a separate method, by the way (if not refactor this // entire monolithic method). // try { if ("gzip".equals(contentEncoding) || "x-gzip".equals(contentEncoding)) { if (truncated) { throw new AbortedFetchException(url, "Truncated compressed data", AbortedFetchReason.CONTENT_SIZE); } else { ExpandedResult expandedResult = EncodingUtils.processGzipEncoded(content, maxContentSize); truncated = expandedResult.isTruncated(); if ((truncated) && (!isTextMimeType(mimeType))) { throw new AbortedFetchException(url, "Truncated decompressed image", AbortedFetchReason.CONTENT_SIZE); } else { content = expandedResult.getExpanded(); if (LOGGER.isTraceEnabled()) { fetchTrace.append("; unzipped to " + content.length + " bytes"); } } // } else if ("deflate".equals(contentEncoding)) { // content = EncodingUtils.processDeflateEncoded(content); // if (LOGGER.isTraceEnabled()) { // fetchTrace.append("; inflated to " + content.length + " bytes"); // } } } } catch (IOException e) { throw new IOFetchException(url, e); } } // Finally dump out the trace msg we've been building. if (LOGGER.isTraceEnabled()) { LOGGER.trace(fetchTrace.toString()); } // TODO KKr - Save truncated flag in FetchedResult/FetchedDatum. return new FetchedResult(url, redirectedUrl, System.currentTimeMillis(), headerMap, content, contentType, (int) readRate, payload, newBaseUrl, numRedirects, hostAddress); } private boolean isTextMimeType(String mimeType) { for (String textContentType : TEXT_MIME_TYPES) { if (textContentType.equals(mimeType)) { return true; } } return false; } private String extractRedirectedUrl(String url, HttpContext localContext) { // This was triggered by HttpClient with the redirect count was exceeded. HttpHost host = (HttpHost) localContext.getAttribute(ExecutionContext.HTTP_TARGET_HOST); HttpUriRequest finalRequest = (HttpUriRequest) localContext.getAttribute(ExecutionContext.HTTP_REQUEST); try { URL hostUrl = new URI(host.toURI()).toURL(); return new URL(hostUrl, finalRequest.getURI().toString()).toExternalForm(); } catch (MalformedURLException e) { LOGGER.warn("Invalid host/uri specified in final fetch: " + host + finalRequest.getURI()); return url; } catch (URISyntaxException e) { LOGGER.warn("Invalid host/uri specified in final fetch: " + host + finalRequest.getURI()); return url; } } private static void safeClose(Closeable o) { if (o != null) { try { o.close(); } catch (Exception e) { // Ignore any errors } } } private static void safeAbort(boolean needAbort, HttpRequestBase request) { if (needAbort && (request != null)) { try { request.abort(); } catch (Throwable t) { // Ignore any errors } } } private synchronized void init() { if (_httpClient == null) { // Create and initialize HTTP parameters HttpParams params = new BasicHttpParams(); // TODO KKr - w/4.1, switch to new api (ThreadSafeClientConnManager) // cm.setMaxTotalConnections(_maxThreads); // cm.setDefaultMaxPerRoute(Math.max(10, _maxThreads/10)); ConnManagerParams.setMaxTotalConnections(params, _maxThreads); // Set the maximum time we'll wait for a spare connection in the connection pool. We // shouldn't actually hit this, as we make sure (in FetcherManager) that the max number // of active requests doesn't exceed the value returned by getMaxThreads() here. ConnManagerParams.setTimeout(params, CONNECTION_POOL_TIMEOUT); // Set the socket and connection timeout to be something reasonable. HttpConnectionParams.setSoTimeout(params, _socketTimeout); HttpConnectionParams.setConnectionTimeout(params, _connectionTimeout); // Even with stale checking enabled, a connection can "go stale" between the check and the // next request. So we still need to handle the case of a closed socket (from the server side), // and disabling this check improves performance. HttpConnectionParams.setStaleCheckingEnabled(params, false); // FUTURE - set this on a per-route (host) basis when we have per-host policies for // doing partner crawls. We could define a BixoConnPerRoute class that supports this. ConnPerRouteBean connPerRoute = new ConnPerRouteBean(getMaxConnectionsPerHost()); ConnManagerParams.setMaxConnectionsPerRoute(params, connPerRoute); HttpProtocolParams.setVersion(params, _httpVersion); HttpProtocolParams.setUserAgent(params, _userAgent.getUserAgentString()); HttpProtocolParams.setContentCharset(params, "UTF-8"); HttpProtocolParams.setHttpElementCharset(params, "UTF-8"); HttpProtocolParams.setUseExpectContinue(params, true); // TODO KKr - set on connection manager params, or client params? CookieSpecParamBean cookieParams = new CookieSpecParamBean(params); cookieParams.setSingleHeader(true); // Create and initialize scheme registry SchemeRegistry schemeRegistry = new SchemeRegistry(); schemeRegistry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80)); SSLSocketFactory sf = null; for (String contextName : SSL_CONTEXT_NAMES) { try { SSLContext sslContext = SSLContext.getInstance(contextName); sslContext.init(null, new TrustManager[] { new DummyX509TrustManager(null) }, null); sf = new SSLSocketFactory(sslContext); break; } catch (NoSuchAlgorithmException e) { LOGGER.debug("SSLContext algorithm not available: " + contextName); } catch (Exception e) { LOGGER.debug("SSLContext can't be initialized: " + contextName, e); } } if (sf != null) { sf.setHostnameVerifier(new DummyX509HostnameVerifier()); schemeRegistry.register(new Scheme("https", sf, 443)); } else { LOGGER.warn("No valid SSLContext found for https"); } // Use ThreadSafeClientConnManager since more than one thread will be using the HttpClient. ThreadSafeClientConnManager cm = new ThreadSafeClientConnManager(params, schemeRegistry); _httpClient = new DefaultHttpClient(cm, params); _httpClient.setHttpRequestRetryHandler(new MyRequestRetryHandler(_maxRetryCount)); _httpClient.setRedirectHandler(new MyRedirectHandler(getRedirectMode())); _httpClient.addRequestInterceptor(new MyRequestInterceptor()); params = _httpClient.getParams(); // FUTURE KKr - support authentication HttpClientParams.setAuthenticating(params, false); HttpClientParams.setCookiePolicy(params, CookiePolicy.BEST_MATCH); ClientParamBean clientParams = new ClientParamBean(params); if (getMaxRedirects() == 0) { clientParams.setHandleRedirects(false); } else { clientParams.setHandleRedirects(true); clientParams.setMaxRedirects(getMaxRedirects()); } // Set up default headers. This helps us get back from servers what we want. HashSet<Header> defaultHeaders = new HashSet<Header>(); defaultHeaders.add(new BasicHeader(HttpHeaders.ACCEPT_LANGUAGE, getAcceptLanguage())); defaultHeaders.add(new BasicHeader(HttpHeaders.ACCEPT_CHARSET, DEFAULT_ACCEPT_CHARSET)); defaultHeaders.add(new BasicHeader(HttpHeaders.ACCEPT_ENCODING, DEFAULT_ACCEPT_ENCODING)); defaultHeaders.add(new BasicHeader(HttpHeaders.ACCEPT, DEFAULT_ACCEPT)); clientParams.setDefaultHeaders(defaultHeaders); } } @Override public void abort() { // TODO Actually try to abort } }