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// HTTPLoader.java
// ---------------
// (C) by Michael Peter Christen; mc@yacy.net
// first published on http://yacy.net
// Frankfurt, Germany, 2006
//
// $LastChangedDate$
// $LastChangedRevision$
// $LastChangedBy$
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package net.yacy.crawler.retrieval;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Locale;
import org.apache.http.HttpStatus;
import org.apache.http.StatusLine;
import net.yacy.cora.document.id.DigestURL;
import net.yacy.cora.federate.solr.FailCategory;
import net.yacy.cora.protocol.ClientIdentification;
import net.yacy.cora.protocol.HeaderFramework;
import net.yacy.cora.protocol.RequestHeader;
import net.yacy.cora.protocol.ResponseHeader;
import net.yacy.cora.protocol.http.HTTPClient;
import net.yacy.cora.util.ConcurrentLog;
import net.yacy.cora.util.HTTPInputStream;
import net.yacy.cora.util.StrictLimitInputStream;
import net.yacy.crawler.CrawlSwitchboard;
import net.yacy.crawler.data.Cache;
import net.yacy.crawler.data.CrawlProfile;
import net.yacy.crawler.data.Latency;
import net.yacy.kelondro.io.ByteCount;
import net.yacy.kelondro.util.Formatter;
import net.yacy.repository.Blacklist.BlacklistType;
import net.yacy.search.Switchboard;
import net.yacy.search.SwitchboardConstants;
import net.yacy.server.http.AlternativeDomainNames;
public final class HTTPLoader {
private static final String DEFAULT_ENCODING = "gzip,deflate";
private static final String DEFAULT_LANGUAGE = "en-us,en;q=0.5";
private static final String DEFAULT_CHARSET = "ISO-8859-1,utf-8;q=0.7,*;q=0.7";
public static final String DEFAULT_ACCEPT = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
public static final int DEFAULT_MAXFILESIZE = 1024 * 1024 * 10;
public static final int DEFAULT_CRAWLING_RETRY_COUNT = 5;
/**
* The socket timeout that should be used
*/
private final int socketTimeout;
private final Switchboard sb;
private final ConcurrentLog log;
public HTTPLoader(final Switchboard sb, final ConcurrentLog theLog) {
this.sb = sb;
this.log = theLog;
// refreshing timeout value
this.socketTimeout = (int) sb.getConfigLong("crawler.clientTimeout", 30000);
}
public Response load(final Request entry, CrawlProfile profile, final int maxFileSize, final BlacklistType blacklistType, final ClientIdentification.Agent agent) throws IOException {
// load fulltext of html page
Latency.updateBeforeLoad(entry.url());
final long start = System.currentTimeMillis();
final Response doc = load(entry, profile, DEFAULT_CRAWLING_RETRY_COUNT, maxFileSize, blacklistType, agent);
Latency.updateAfterLoad(entry.url(), System.currentTimeMillis() - start);
return doc;
}
/**
* Open an input stream on a requested HTTP resource. When the resource content size is small
* (lower than {@link Response#CRAWLER_MAX_SIZE_TO_CACHE}, fully load it and use a ByteArrayInputStream instance.
* @param request
* @param profile crawl profile
* @param retryCount remaining redirect retries count
* @param maxFileSize max file size to load. -1 means no limit.
* @param blacklistType blacklist type to use
* @param agent agent identifier
* @return a response with full meta data and embedding on open input stream on content. Don't forget to close the stream.
* @throws IOException when an error occurred
*/
public StreamResponse openInputStream(
final Request request, CrawlProfile profile, final int retryCount,
final int maxFileSize, final BlacklistType blacklistType, final ClientIdentification.Agent agent
) throws IOException {
if (retryCount < 0) {
this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.TEMPORARY_NETWORK_FAILURE, "retry counter exceeded", -1);
throw new IOException( "retry counter exceeded for URL " + request.url().toString() + ". Processing aborted.$");
}
DigestURL url = request.url();
final String host = url.getHost();
if (host == null || host.length() < 2) {
throw new IOException("host is not well-formed: '" + host + "'");
}
final String path = url.getFile();
int port = url.getPort();
final boolean ssl = url.getProtocol().equals("https");
if (port < 0)
port = (ssl) ? 443 : 80;
// check if url is in blacklist
final String hostlow = host.toLowerCase(Locale.ROOT);
if (blacklistType != null && Switchboard.urlBlacklist.isListed(blacklistType, hostlow, path)) {
this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.FINAL_LOAD_CONTEXT,
"url in blacklist", -1);
throw new IOException("CRAWLER Rejecting URL '" + request.url().toString() + "'. URL is in blacklist.$");
}
// resolve yacy and yacyh domains
final AlternativeDomainNames yacyResolver = this.sb.peers;
if (yacyResolver != null) {
final String yAddress = yacyResolver.resolve(host);
if (yAddress != null) {
url = new DigestURL(url.getProtocol() + "://" + yAddress + path);
}
}
// create a request header
final RequestHeader requestHeader = createRequestheader(request, agent);
// HTTP-Client
final HTTPClient client = new HTTPClient(agent);
client.setRedirecting(false); // we want to handle redirection
// ourselves, so we don't index pages
// twice
client.setTimout(this.socketTimeout);
client.setHeader(requestHeader.entrySet());
// send request
client.GET(url, false);
final StatusLine statusline = client.getHttpResponse().getStatusLine();
final int statusCode = statusline.getStatusCode();
final ResponseHeader responseHeader = new ResponseHeader(statusCode, client.getHttpResponse().getAllHeaders());
String requestURLString = request.url().toNormalform(true);
// check redirection
if (statusCode > 299 && statusCode < 310) {
client.finish();
final DigestURL redirectionUrl = extractRedirectURL(request, profile, url, statusline, responseHeader, requestURLString);
if (this.sb.getConfigBool(SwitchboardConstants.CRAWLER_FOLLOW_REDIRECTS, true)) {
// we have two use cases here: loading from a crawl or just
// loading the url. Check this:
if (profile != null && !CrawlSwitchboard.DEFAULT_PROFILES.contains(profile.name())) {
// put redirect url on the crawler queue to repeat a
// double-check
/* We have to clone the request instance and not to modify directly its URL,
* otherwise the stackCrawl() function would reject it, because detecting it as already in the activeWorkerEntries */
Request redirectedRequest = new Request(request.initiator(),
redirectionUrl,
request.referrerhash(),
request.name(),
request.appdate(),
request.profileHandle(),
request.depth(),
request.timezoneOffset());
String rejectReason = this.sb.crawlStacker.stackCrawl(redirectedRequest);
if(rejectReason != null) {
throw new IOException("CRAWLER Redirect of URL=" + requestURLString + " aborted. Reason : " + rejectReason);
}
// in the end we must throw an exception (even if this is
// not an error, just to abort the current process
throw new IOException("CRAWLER Redirect of URL=" + requestURLString + " to "
+ redirectionUrl.toNormalform(false) + " placed on crawler queue for double-check");
}
// if we are already doing a shutdown we don't need to retry
// crawling
if (Thread.currentThread().isInterrupted()) {
this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile,
FailCategory.FINAL_LOAD_CONTEXT, "server shutdown", statusCode);
throw new IOException(
"CRAWLER Redirect of URL=" + requestURLString + " aborted because of server shutdown.$");
}
// check if the redirected URL is the same as the requested URL
// this shortcuts a time-out using retryCount
if (redirectionUrl.equals(url)) {
this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.TEMPORARY_NETWORK_FAILURE, "redirect to same url", -1);
throw new IOException( "retry counter exceeded for URL " + request.url().toString() + ". Processing aborted.$");
}
// retry crawling with new url
request.redirectURL(redirectionUrl);
return openInputStream(request, profile, retryCount - 1, maxFileSize, blacklistType, agent);
}
// we don't want to follow redirects
this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.FINAL_PROCESS_CONTEXT, "redirection not wanted", statusCode);
throw new IOException("REJECTED UNWANTED REDIRECTION '" + statusline + "' for URL '" + requestURLString + "'$");
} else if (statusCode == HttpStatus.SC_OK || statusCode == HttpStatus.SC_NON_AUTHORITATIVE_INFORMATION) {
// the transfer is ok
/*
* When content is not large (less than Response.CRAWLER_MAX_SIZE_TO_CACHE), we have better cache it if cache is enabled and url is not local
*/
long contentLength = client.getHttpResponse().getEntity().getContentLength();
InputStream contentStream;
if (profile != null && profile.storeHTCache() && contentLength > 0 && contentLength < (Response.CRAWLER_MAX_SIZE_TO_CACHE) && !url.isLocal()) {
byte[] content = null;
try {
content = HTTPClient.getByteArray(client.getHttpResponse().getEntity(), maxFileSize);
Cache.store(url, responseHeader, content);
} catch (final IOException e) {
this.log.warn("cannot write " + url + " to Cache (3): " + e.getMessage(), e);
} finally {
client.finish();
}
contentStream = new ByteArrayInputStream(content);
} else {
/*
* Content length may already be known now : check it before opening a stream
*/
if (maxFileSize >= 0 && contentLength > maxFileSize) {
throw new IOException("Content to download exceed maximum value of " + maxFileSize + " bytes");
}
/*
* Create a HTTPInputStream delegating to
* client.getContentstream(). Close method will ensure client is
* properly closed.
*/
contentStream = new HTTPInputStream(client);
/* Anticipated content length may not be already known or incorrect : let's apply now the same eventual content size restriction as when loading in a byte array */
if(maxFileSize >= 0) {
contentStream = new StrictLimitInputStream(contentStream, maxFileSize,
"Content to download exceed maximum value of " + Formatter.bytesToString(maxFileSize));
}
}
return new StreamResponse(new Response(request, requestHeader, responseHeader, profile, false, null), contentStream);
} else {
client.finish();
// if the response has not the right response type then reject file
this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile,
FailCategory.TEMPORARY_NETWORK_FAILURE, "wrong http status code", statusCode);
throw new IOException("REJECTED WRONG STATUS TYPE '" + statusline
+ "' for URL '" + requestURLString + "'$");
}
}
/**
* Extract redirect URL from response header. Status code is supposed to be between 299 and 310. Parameters must not be null.
* @return redirect URL
* @throws IOException when an error occured
*/
private DigestURL extractRedirectURL(final Request request, CrawlProfile profile, DigestURL url,
final StatusLine statusline, final ResponseHeader responseHeader, String requestURLString)
throws IOException {
// read redirection URL
String redirectionUrlString = responseHeader.get(HeaderFramework.LOCATION);
redirectionUrlString = redirectionUrlString == null ? "" : redirectionUrlString.trim();
if (redirectionUrlString.isEmpty()) {
this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile,
FailCategory.TEMPORARY_NETWORK_FAILURE,
"no redirection url provided, field '" + HeaderFramework.LOCATION + "' is empty", statusline.getStatusCode());
throw new IOException("REJECTED EMTPY REDIRECTION '" + statusline
+ "' for URL '" + requestURLString + "'$");
}
// normalize URL
final DigestURL redirectionUrl = DigestURL.newURL(request.url(), redirectionUrlString);
// restart crawling with new url
this.log.info("CRAWLER Redirection detected ('" + statusline + "') for URL "
+ requestURLString);
this.log.info("CRAWLER ..Redirecting request to: " + redirectionUrl.toNormalform(false));
this.sb.webStructure.generateCitationReference(url, redirectionUrl);
if (this.sb.getConfigBool(SwitchboardConstants.CRAWLER_RECORD_REDIRECTS, true)) {
this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile,
FailCategory.FINAL_REDIRECT_RULE, "redirect to " + redirectionUrlString, statusline.getStatusCode());
}
return redirectionUrl;
}
/**
* Create request header for loading content.
* @param request search request
* @param agent agent identification information
* @return a request header
* @throws IOException when an error occured
*/
private RequestHeader createRequestheader(final Request request, final ClientIdentification.Agent agent)
throws IOException {
final RequestHeader requestHeader = new RequestHeader();
requestHeader.put(HeaderFramework.USER_AGENT, agent.userAgent);
if (request.referrerhash() != null) {
DigestURL refererURL = this.sb.getURL(request.referrerhash());
if (refererURL != null) {
requestHeader.put(RequestHeader.REFERER, refererURL.toNormalform(true));
}
}
requestHeader.put(HeaderFramework.ACCEPT, this.sb.getConfig("crawler.http.accept", DEFAULT_ACCEPT));
requestHeader.put(HeaderFramework.ACCEPT_LANGUAGE,
this.sb.getConfig("crawler.http.acceptLanguage", DEFAULT_LANGUAGE));
requestHeader.put(HeaderFramework.ACCEPT_CHARSET,
this.sb.getConfig("crawler.http.acceptCharset", DEFAULT_CHARSET));
requestHeader.put(HeaderFramework.ACCEPT_ENCODING,
this.sb.getConfig("crawler.http.acceptEncoding", DEFAULT_ENCODING));
return requestHeader;
}
private Response load(final Request request, CrawlProfile profile, final int retryCount, final int maxFileSize, final BlacklistType blacklistType, final ClientIdentification.Agent agent) throws IOException {
if (retryCount < 0) {
this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.TEMPORARY_NETWORK_FAILURE, "retry counter exceeded", -1);
throw new IOException("retry counter exceeded for URL " + request.url().toString() + ". Processing aborted.$");
}
DigestURL url = request.url();
final String host = url.getHost();
if (host == null || host.length() < 2) throw new IOException("host is not well-formed: '" + host + "'");
final String path = url.getFile();
int port = url.getPort();
final boolean ssl = url.getProtocol().equals("https");
if (port < 0) port = (ssl) ? 443 : 80;
// check if url is in blacklist
final String hostlow = host.toLowerCase(Locale.ROOT);
if (blacklistType != null && Switchboard.urlBlacklist.isListed(blacklistType, hostlow, path)) {
this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.FINAL_LOAD_CONTEXT, "url in blacklist", -1);
throw new IOException("CRAWLER Rejecting URL '" + request.url().toString() + "'. URL is in blacklist.$");
}
// resolve yacy and yacyh domains
final AlternativeDomainNames yacyResolver = this.sb.peers;
if(yacyResolver != null) {
final String yAddress = yacyResolver.resolve(host);
if(yAddress != null) {
url = new DigestURL(url.getProtocol() + "://" + yAddress + path);
}
}
// take a file from the net
Response response = null;
// create a request header
final RequestHeader requestHeader = createRequestheader(request, agent);
// HTTP-Client
final HTTPClient client = new HTTPClient(agent);
client.setRedirecting(false); // we want to handle redirection ourselves, so we don't index pages twice
client.setTimout(this.socketTimeout);
client.setHeader(requestHeader.entrySet());
// send request
final byte[] responseBody = client.GETbytes(url, sb.getConfig(SwitchboardConstants.ADMIN_ACCOUNT_USER_NAME, "admin"), sb.getConfig(SwitchboardConstants.ADMIN_ACCOUNT_B64MD5, ""), maxFileSize, false);
final int statusCode = client.getHttpResponse().getStatusLine().getStatusCode();
final ResponseHeader responseHeader = new ResponseHeader(statusCode, client.getHttpResponse().getAllHeaders());
String requestURLString = request.url().toNormalform(true);
// check redirection
if (statusCode > 299 && statusCode < 310) {
final DigestURL redirectionUrl = extractRedirectURL(request, profile, url, client.getHttpResponse().getStatusLine(),
responseHeader, requestURLString);
if (this.sb.getConfigBool(SwitchboardConstants.CRAWLER_FOLLOW_REDIRECTS, true)) {
// we have two use cases here: loading from a crawl or just loading the url. Check this:
if (profile != null && !CrawlSwitchboard.DEFAULT_PROFILES.contains(profile.name())) {
// put redirect url on the crawler queue to repeat a double-check
/* We have to clone the request instance and not to modify directly its URL,
* otherwise the stackCrawl() function would reject it, because detecting it as already in the activeWorkerEntries */
Request redirectedRequest = new Request(request.initiator(),
redirectionUrl,
request.referrerhash(),
request.name(),
request.appdate(),
request.profileHandle(),
request.depth(),
request.timezoneOffset());
String rejectReason = this.sb.crawlStacker.stackCrawl(redirectedRequest);
// in the end we must throw an exception (even if this is not an error, just to abort the current process
if(rejectReason != null) {
throw new IOException("CRAWLER Redirect of URL=" + requestURLString + " aborted. Reason : " + rejectReason);
}
throw new IOException("CRAWLER Redirect of URL=" + requestURLString + " to " + redirectionUrl.toNormalform(false) + " placed on crawler queue for double-check");
}
// if we are already doing a shutdown we don't need to retry crawling
if (Thread.currentThread().isInterrupted()) {
this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.FINAL_LOAD_CONTEXT, "server shutdown", statusCode);
throw new IOException("CRAWLER Redirect of URL=" + requestURLString + " aborted because of server shutdown.$");
}
// retry crawling with new url
request.redirectURL(redirectionUrl);
return load(request, profile, retryCount - 1, maxFileSize, blacklistType, agent);
}
// we don't want to follow redirects
this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.FINAL_PROCESS_CONTEXT, "redirection not wanted", statusCode);
throw new IOException("REJECTED UNWANTED REDIRECTION '" + client.getHttpResponse().getStatusLine() + "' for URL '" + requestURLString + "'$");
} else if (responseBody == null) {
// no response, reject file
this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.TEMPORARY_NETWORK_FAILURE, "no response body", statusCode);
throw new IOException("REJECTED EMPTY RESPONSE BODY '" + client.getHttpResponse().getStatusLine() + "' for URL '" + requestURLString + "'$");
} else if (statusCode == 200 || statusCode == 203) {
// the transfer is ok
// we write the new cache entry to file system directly
final long contentLength = responseBody.length;
ByteCount.addAccountCount(ByteCount.CRAWLER, contentLength);
// check length again in case it was not possible to get the length before loading
if (maxFileSize >= 0 && contentLength > maxFileSize) {
this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.FINAL_PROCESS_CONTEXT, "file size limit exceeded", statusCode);
throw new IOException("REJECTED URL " + request.url() + " because file size '" + contentLength + "' exceeds max filesize limit of " + maxFileSize + " bytes. (GET)$");
}
// create a new cache entry
response = new Response(
request,
requestHeader,
responseHeader,
profile,
false,
responseBody
);
return response;
} else {
// if the response has not the right response type then reject file
this.sb.crawlQueues.errorURL.push(request.url(), request.depth(), profile, FailCategory.TEMPORARY_NETWORK_FAILURE, "wrong http status code", statusCode);
throw new IOException("REJECTED WRONG STATUS TYPE '" + client.getHttpResponse().getStatusLine() + "' for URL '" + requestURLString + "'$");
}
}
public static Response load(final Request request, ClientIdentification.Agent agent) throws IOException {
return load(request, agent, 3);
}
private static Response load(final Request request, ClientIdentification.Agent agent, final int retryCount) throws IOException {
if (retryCount < 0) {
throw new IOException("Redirection counter exceeded for URL " + request.url().toString() + ". Processing aborted.");
}
final String host = request.url().getHost();
if (host == null || host.length() < 2) throw new IOException("host is not well-formed: '" + host + "'");
final String path = request.url().getFile();
int port = request.url().getPort();
final boolean ssl = request.url().getProtocol().equals("https");
if (port < 0) port = (ssl) ? 443 : 80;
// check if url is in blacklist
final String hostlow = host.toLowerCase(Locale.ROOT);
if (Switchboard.urlBlacklist != null && Switchboard.urlBlacklist.isListed(BlacklistType.CRAWLER, hostlow, path)) {
throw new IOException("CRAWLER Rejecting URL '" + request.url().toString() + "'. URL is in blacklist.");
}
// take a file from the net
Response response = null;
// create a request header
final RequestHeader requestHeader = new RequestHeader();
requestHeader.put(HeaderFramework.USER_AGENT, agent.userAgent);
requestHeader.put(HeaderFramework.ACCEPT_LANGUAGE, DEFAULT_LANGUAGE);
requestHeader.put(HeaderFramework.ACCEPT_CHARSET, DEFAULT_CHARSET);
requestHeader.put(HeaderFramework.ACCEPT_ENCODING, DEFAULT_ENCODING);
final HTTPClient client = new HTTPClient(agent);
client.setTimout(20000);
client.setHeader(requestHeader.entrySet());
final byte[] responseBody = client.GETbytes(request.url(), null, null, false);
final int code = client.getHttpResponse().getStatusLine().getStatusCode();
final ResponseHeader header = new ResponseHeader(code, client.getHttpResponse().getAllHeaders());
// FIXME: 30*-handling (bottom) is never reached
// we always get the final content because httpClient.followRedirects = true
if (responseBody != null && (code == 200 || code == 203)) {
// the transfer is ok
//statistics:
ByteCount.addAccountCount(ByteCount.CRAWLER, responseBody.length);
// we write the new cache entry to file system directly
// create a new cache entry
response = new Response(
request,
requestHeader,
header,
null,
false,
responseBody
);
return response;
} else if (code > 299 && code < 310) {
if (header.containsKey(HeaderFramework.LOCATION)) {
// getting redirection URL
String redirectionUrlString = header.get(HeaderFramework.LOCATION);
redirectionUrlString = redirectionUrlString.trim();
if (redirectionUrlString.isEmpty()) {
throw new IOException("CRAWLER Redirection of URL=" + request.url().toString() + " aborted. Location header is empty.");
}
// normalizing URL
final DigestURL redirectionUrl = DigestURL.newURL(request.url(), redirectionUrlString);
// if we are already doing a shutdown we don't need to retry crawling
if (Thread.currentThread().isInterrupted()) {
throw new IOException("CRAWLER Retry of URL=" + request.url().toString() + " aborted because of server shutdown.");
}
// retry crawling with new url
request.redirectURL(redirectionUrl);
return load(request, agent, retryCount - 1);
}
} else {
// if the response has not the right response type then reject file
throw new IOException("REJECTED WRONG STATUS TYPE '" + client.getHttpResponse().getStatusLine() + "' for URL " + request.url().toString());
}
return response;
}
}
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