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353 lines
13 KiB
353 lines
13 KiB
// CrawlerWorker.java
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// -------------------------------------
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// part of YACY
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// (C) by Michael Peter Christen; mc@anomic.de
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// first published on http://www.anomic.de
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// Frankfurt, Germany, 2006
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//
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// This file ist contributed by Martin Thelian
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//
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// $LastChangedDate: 2006-02-20 23:57:42 +0100 (Mo, 20 Feb 2006) $
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// $LastChangedRevision: 1715 $
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// $LastChangedBy: theli $
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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// Using this software in any meaning (reading, learning, copying, compiling,
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// running) means that you agree that the Author(s) is (are) not responsible
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// for cost, loss of data or any harm that may be caused directly or indirectly
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// by usage of this softare or this documentation. The usage of this software
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// is on your own risk. The installation and usage (starting/running) of this
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// software may allow other people or application to access your computer and
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// any attached devices and is highly dependent on the configuration of the
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// software which must be done by the user of the software; the author(s) is
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// (are) also not responsible for proper configuration and usage of the
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// software, even if provoked by documentation provided together with
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// the software.
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//
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// Any changes to this file according to the GPL as documented in the file
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// gpl.txt aside this file in the shipment you received can be done to the
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// lines that follows this copyright notice here, but changes must not be
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// done inside the copyright notive above. A re-distribution must contain
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// the intact and unchanged copyright notice.
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// Contributions and changes to the program code must be marked as such.
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package de.anomic.crawler;
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import java.io.ByteArrayOutputStream;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.io.PrintStream;
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import java.io.PrintWriter;
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import java.util.Date;
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import de.anomic.net.ftpc;
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import de.anomic.plasma.plasmaHTCache;
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import de.anomic.plasma.plasmaParser;
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import de.anomic.plasma.plasmaSwitchboard;
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import de.anomic.plasma.cache.ftp.ResourceInfo;
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import de.anomic.server.logging.serverLog;
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import de.anomic.yacy.yacyURL;
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public class FTPLoader {
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private final plasmaSwitchboard sb;
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private final serverLog log;
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private final int maxFileSize;
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public FTPLoader(final plasmaSwitchboard sb, final serverLog log) {
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this.sb = sb;
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this.log = log;
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maxFileSize = (int) sb.getConfigLong("crawler.ftp.maxFileSize", -1l);
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}
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protected plasmaHTCache.Entry createCacheEntry(final CrawlEntry entry, final String mimeType,
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final Date fileDate) {
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return plasmaHTCache.newEntry(new Date(), entry.depth(), entry.url(), entry.name(), "OK", new ResourceInfo(
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entry.url(), sb.getURL(entry.referrerhash()), mimeType, fileDate), entry.initiator(),
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sb.webIndex.profilesActiveCrawls.getEntry(entry.profileHandle()));
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}
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/**
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* Loads the entry from a ftp-server
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*
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* @param entry
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* @return
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*/
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public plasmaHTCache.Entry load(final CrawlEntry entry) {
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final yacyURL entryUrl = entry.url();
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final String fullPath = getPath(entryUrl);
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final File cacheFile = createCachefile(entryUrl);
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// the return value
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plasmaHTCache.Entry htCache = null;
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// determine filename and path
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String file, path;
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if (fullPath.endsWith("/")) {
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file = "";
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path = fullPath;
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} else {
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final int pos = fullPath.lastIndexOf("/");
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if (pos == -1) {
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file = fullPath;
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path = "/";
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} else {
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path = fullPath.substring(0, pos + 1);
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file = fullPath.substring(pos + 1);
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}
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}
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assert path.endsWith("/") : "FTPLoader: path is not a path: '" + path + "'";
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// stream for ftp-client errors
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final ByteArrayOutputStream berr = new ByteArrayOutputStream();
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final ftpc ftpClient = createFTPClient(berr);
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if (openConnection(ftpClient, entryUrl)) {
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// ftp stuff
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try {
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// testing if the specified file is a directory
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if (file.length() > 0) {
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ftpClient.exec("cd \"" + path + "\"", false);
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final boolean isFolder = ftpClient.isFolder(file);
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if (isFolder) {
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path = fullPath + "/";
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file = "";
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}
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}
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if (file.length() == 0) {
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// directory -> get list of files
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// create a htcache entry
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htCache = createCacheEntry(entry, "text/html", new Date());
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if (!generateDirlist(ftpClient, entry, path, cacheFile)) {
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htCache = null;
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}
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} else {
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// file -> download
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try {
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htCache = getFile(ftpClient, entry, cacheFile);
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} catch (final Exception e) {
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// add message to errorLog
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(new PrintStream(berr)).print(e.getMessage());
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}
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}
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} finally {
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closeConnection(ftpClient);
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}
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}
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// pass the downloaded resource to the cache manager
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if (berr.size() > 0 || htCache == null) {
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// some error logging
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final String detail = (berr.size() > 0) ? "\n Errorlog: " + berr.toString() : "";
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log.logWarning("Unable to download URL " + entry.url().toString() + detail);
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sb.crawlQueues.errorURL.newEntry(entry, sb.webIndex.seedDB.mySeed().hash, new Date(), 1, ErrorURL.DENIED_SERVER_DOWNLOAD_ERROR);
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// an error has occured. cleanup
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if (cacheFile.exists()) {
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cacheFile.delete();
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}
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} else {
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// announce the file
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plasmaHTCache.writeFileAnnouncement(cacheFile);
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}
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return htCache;
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}
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/**
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* creating a cache file object
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*
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* @param entryUrl
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* @return
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*/
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private File createCachefile(final yacyURL entryUrl) {
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final File cacheFile = plasmaHTCache.getCachePath(entryUrl);
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// testing if the file already exists
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if (cacheFile.isFile()) {
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// delete the file if it already exists
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plasmaHTCache.deleteURLfromCache(entryUrl);
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} else {
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// create parent directories
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cacheFile.getParentFile().mkdirs();
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}
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return cacheFile;
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}
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/**
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* @param ftpClient
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*/
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private void closeConnection(final ftpc ftpClient) {
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// closing connection
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ftpClient.exec("close", false);
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ftpClient.exec("exit", false);
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}
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/**
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* establish a connection to the ftp server (open, login, set transfer mode)
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*
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* @param ftpClient
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* @param host
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* @param port
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* @return success
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*/
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private boolean openConnection(final ftpc ftpClient, final yacyURL entryUrl) {
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// get username and password
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final String userInfo = entryUrl.getUserInfo();
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String userName = "anonymous", userPwd = "anonymous";
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if (userInfo != null) {
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final int pos = userInfo.indexOf(":");
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if (pos != -1) {
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userName = userInfo.substring(0, pos);
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userPwd = userInfo.substring(pos + 1);
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}
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}
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// get server name and port
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final String host = entryUrl.getHost();
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final int port = entryUrl.getPort();
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// open a connection to the ftp server
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if (port == -1) {
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ftpClient.exec("open " + host, false);
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} else {
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ftpClient.exec("open " + host + " " + port, false);
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}
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if (ftpClient.notConnected()) {
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return false;
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}
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// login to the server
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ftpClient.exec("user " + userName + " " + userPwd, false);
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if (ftpClient.isLoggedIn()) {
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// change transfer mode to binary
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ftpClient.exec("binary", false);
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} else {
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return false;
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}
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return true;
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}
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/**
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* @param ftpClient
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* @param entry
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* @param htCache
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* @param cacheFile
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* @return
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* @throws Exception
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*/
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private plasmaHTCache.Entry getFile(final ftpc ftpClient, final CrawlEntry entry, final File cacheFile)
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throws Exception {
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// determine the mimetype of the resource
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final yacyURL entryUrl = entry.url();
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final String extension = plasmaParser.getFileExt(entryUrl);
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final String mimeType = plasmaParser.getMimeTypeByFileExt(extension);
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final String path = getPath(entryUrl);
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// if the mimetype and file extension is supported we start to download
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// the file
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plasmaHTCache.Entry htCache = null;
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if (plasmaParser.supportedContent(plasmaParser.PARSER_MODE_CRAWLER, entryUrl, mimeType)) {
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// aborting download if content is too long
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final int size = ftpClient.fileSize(path);
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if (size <= maxFileSize || maxFileSize == -1) {
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// timeout for download
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ftpClient.setDataTimeoutByMaxFilesize(size);
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// determine the file date
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final Date fileDate = ftpClient.entryDate(path);
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// create a htcache entry
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htCache = createCacheEntry(entry, mimeType, fileDate);
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// download the remote file
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ftpClient.exec("get \"" + path + "\" \"" + cacheFile.getAbsolutePath() + "\"", false);
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} else {
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log.logInfo("REJECTED TOO BIG FILE with size " + size + " Bytes for URL " + entry.url().toString());
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sb.crawlQueues.errorURL.newEntry(entry, this.sb.webIndex.seedDB.mySeed().hash, new Date(), 1,
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ErrorURL.DENIED_FILESIZE_LIMIT_EXCEEDED);
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throw new Exception("file size exceeds limit");
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}
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} else {
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// if the response has not the right file type then reject file
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log.logInfo("REJECTED WRONG MIME/EXT TYPE " + mimeType + " for URL " + entry.url().toString());
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sb.crawlQueues.errorURL.newEntry(entry, null, new Date(), 1, ErrorURL.DENIED_WRONG_MIMETYPE_OR_EXT);
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throw new Exception("response has not the right file type -> rejected");
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}
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return htCache;
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}
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/**
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* gets path suitable for FTP (url-decoded, double-quotes escaped)
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*
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* @param entryUrl
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* @return
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*/
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private String getPath(final yacyURL entryUrl) {
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return yacyURL.unescape(entryUrl.getPath()).replace("\"", "\"\"");
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}
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/**
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* @param ftpClient
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* @param entry
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* @param cacheFile
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* @return
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*/
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private boolean generateDirlist(final ftpc ftpClient, final CrawlEntry entry, final String path,
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final File cacheFile) {
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// getting the dirlist
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final yacyURL entryUrl = entry.url();
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// generate the dirlist
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final StringBuilder dirList = ftpClient.dirhtml(path);
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if (dirList != null && dirList.length() > 0) {
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try {
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// write it into a file
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final PrintWriter writer = new PrintWriter(new FileOutputStream(cacheFile), false);
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writer.write(dirList.toString());
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writer.flush();
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writer.close();
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return true;
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} catch (final Exception e) {
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log.logInfo("Unable to write dirlist for URL " + entryUrl.toString());
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}
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}
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return false;
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}
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/**
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* create a new ftp client
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*
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* @param berr
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* @return
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*/
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private ftpc createFTPClient(final ByteArrayOutputStream berr) {
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// error
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final PrintStream err = new PrintStream(berr);
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final ftpc ftpClient = new ftpc(System.in, null, err);
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// set timeout
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ftpClient.setDataTimeoutByMaxFilesize(maxFileSize);
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return ftpClient;
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}
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}
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