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yacy_search_server/source/de/anomic/plasma/plasmaHTCache.java
orbiter fa1090113d - next try to fix the networking problem: 
set the maximum transfer size to less than MTU=1500-52: buffer size <= 1448
- some refactoring of transfer methods (naming)

git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@4558 6c8d7289-2bf4-0310-a012-ef5d649a1542
2008-03-14 00:16:04 +00:00

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// plasmaHTCache.java
// -----------------------
// part of YaCy
// (C) by Michael Peter Christen; mc@anomic.de
// first published on http://www.anomic.de
// Frankfurt, Germany, 2004
//
// $LastChangedDate$
// $LastChangedRevision$
// $LastChangedBy$
//
// 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
//
// Using this software in any meaning (reading, learning, copying, compiling,
// running) means that you agree that the Author(s) is (are) not responsible
// for cost, loss of data or any harm that may be caused directly or indirectly
// by usage of this softare or this documentation. The usage of this software
// is on your own risk. The installation and usage (starting/running) of this
// software may allow other people or application to access your computer and
// any attached devices and is highly dependent on the configuration of the
// software which must be done by the user of the software; the author(s) is
// (are) also not responsible for proper configuration and usage of the
// software, even if provoked by documentation provided together with
// the software.
//
// Any changes to this file according to the GPL as documented in the file
// gpl.txt aside this file in the shipment you received can be done to the
// lines that follows this copyright notice here, but changes must not be
// done inside the copyright notive above. A re-distribution must contain
// the intact and unchanged copyright notice.
// Contributions and changes to the program code must be marked as such.
/*
Class documentation:
This class has two purposes:
1. provide a object that carries path and header information
that shall be used as objects within a scheduler's stack
2. static methods for a cache control and cache aging
the class shall also be used to do a cache-cleaning and index creation
*/
package de.anomic.plasma;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.lang.StringBuffer;
import java.net.InetAddress;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Map;
import java.util.TreeMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import de.anomic.http.httpHeader;
import de.anomic.kelondro.kelondroBase64Order;
import de.anomic.kelondro.kelondroDyn;
import de.anomic.kelondro.kelondroMScoreCluster;
import de.anomic.kelondro.kelondroMapObjects;
import de.anomic.plasma.cache.IResourceInfo;
import de.anomic.plasma.cache.ResourceInfoFactory;
import de.anomic.plasma.cache.UnsupportedProtocolException;
import de.anomic.server.serverCodings;
import de.anomic.server.serverDomains;
import de.anomic.server.serverFileUtils;
import de.anomic.server.serverInstantThread;
import de.anomic.server.serverSystem;
import de.anomic.server.serverThread;
import de.anomic.server.logging.serverLog;
import de.anomic.tools.enumerateFiles;
import de.anomic.yacy.yacySeed;
import de.anomic.yacy.yacySeedDB;
import de.anomic.yacy.yacyURL;
public final class plasmaHTCache {
public static final String DB_NAME = "responseHeader2.db";
private static final int stackLimit = 150; // if we exceed that limit, we do not check idle
public static final long oneday = 1000 * 60 * 60 * 24; // milliseconds of a day
static kelondroMapObjects responseHeaderDB = null;
private static final LinkedList<Entry> cacheStack = new LinkedList<Entry>();
private static final Map<String, File> cacheAge = Collections.synchronizedMap(new TreeMap<String, File>()); // a <date+hash, cache-path> - relation
public static long curCacheSize = 0;
public static long maxCacheSize;
public static File cachePath;
public static final serverLog log = new serverLog("HTCACHE");
public static final HashSet<File> filesInUse = new HashSet<File>(); // can we delete this file
public static String cacheLayout;
public static boolean cacheMigration;
private static ResourceInfoFactory objFactory = new ResourceInfoFactory();
private static serverThread cacheScanThread;
// doctypes:
public static final char DT_PDFPS = 'p';
public static final char DT_TEXT = 't';
public static final char DT_HTML = 'h';
public static final char DT_DOC = 'd';
public static final char DT_IMAGE = 'i';
public static final char DT_MOVIE = 'm';
public static final char DT_FLASH = 'f';
public static final char DT_SHARE = 's';
public static final char DT_AUDIO = 'a';
public static final char DT_BINARY = 'b';
public static final char DT_UNKNOWN = 'u';
// appearance locations: (used for flags)
public static final int AP_TITLE = 0; // title tag from html header
public static final int AP_H1 = 1; // headline - top level
public static final int AP_H2 = 2; // headline, second level
public static final int AP_H3 = 3; // headline, 3rd level
public static final int AP_H4 = 4; // headline, 4th level
public static final int AP_H5 = 5; // headline, 5th level
public static final int AP_H6 = 6; // headline, 6th level
public static final int AP_TEXT = 7; // word appears in text (used to check validation of other appearances against spam)
public static final int AP_DOM = 8; // word inside an url: in Domain
public static final int AP_PATH = 9; // word inside an url: in path
public static final int AP_IMG = 10; // tag inside image references
public static final int AP_ANCHOR = 11; // anchor description
public static final int AP_ENV = 12; // word appears in environment (similar to anchor appearance)
public static final int AP_BOLD = 13; // may be interpreted as emphasized
public static final int AP_ITALICS = 14; // may be interpreted as emphasized
public static final int AP_WEAK = 15; // for Text that is small or bareley visible
public static final int AP_INVISIBLE = 16; // good for spam detection
public static final int AP_TAG = 17; // for tagged indexeing (i.e. using mp3 tags)
public static final int AP_AUTHOR = 18; // word appears in author name
public static final int AP_OPUS = 19; // word appears in name of opus, which may be an album name (in mp3 tags)
public static final int AP_TRACK = 20; // word appears in track name (i.e. in mp3 tags)
// URL attributes
public static final int UA_LOCAL = 0; // URL was crawled locally
public static final int UA_TILDE = 1; // tilde appears in URL
public static final int UA_REDIRECT = 2; // The URL is a redirection
// local flag attributes
public static final char LT_LOCAL = 'L';
public static final char LT_GLOBAL = 'G';
// doctype calculation
public static char docType(yacyURL url) {
String path = url.getPath().toLowerCase();
// serverLog.logFinest("PLASMA", "docType URL=" + path);
char doctype = DT_UNKNOWN;
if (path.endsWith(".gif")) { doctype = DT_IMAGE; }
else if (path.endsWith(".ico")) { doctype = DT_IMAGE; }
else if (path.endsWith(".bmp")) { doctype = DT_IMAGE; }
else if (path.endsWith(".jpg")) { doctype = DT_IMAGE; }
else if (path.endsWith(".jpeg")) { doctype = DT_IMAGE; }
else if (path.endsWith(".png")) { doctype = DT_IMAGE; }
else if (path.endsWith(".html")) { doctype = DT_HTML; }
else if (path.endsWith(".txt")) { doctype = DT_TEXT; }
else if (path.endsWith(".doc")) { doctype = DT_DOC; }
else if (path.endsWith(".rtf")) { doctype = DT_DOC; }
else if (path.endsWith(".pdf")) { doctype = DT_PDFPS; }
else if (path.endsWith(".ps")) { doctype = DT_PDFPS; }
else if (path.endsWith(".avi")) { doctype = DT_MOVIE; }
else if (path.endsWith(".mov")) { doctype = DT_MOVIE; }
else if (path.endsWith(".qt")) { doctype = DT_MOVIE; }
else if (path.endsWith(".mpg")) { doctype = DT_MOVIE; }
else if (path.endsWith(".md5")) { doctype = DT_SHARE; }
else if (path.endsWith(".mpeg")) { doctype = DT_MOVIE; }
else if (path.endsWith(".asf")) { doctype = DT_FLASH; }
return doctype;
}
public static char docType(String mime) {
// serverLog.logFinest("PLASMA", "docType mime=" + mime);
char doctype = DT_UNKNOWN;
if (mime == null) doctype = DT_UNKNOWN;
else if (mime.startsWith("image/")) doctype = DT_IMAGE;
else if (mime.endsWith("/gif")) doctype = DT_IMAGE;
else if (mime.endsWith("/jpeg")) doctype = DT_IMAGE;
else if (mime.endsWith("/png")) doctype = DT_IMAGE;
else if (mime.endsWith("/html")) doctype = DT_HTML;
else if (mime.endsWith("/rtf")) doctype = DT_DOC;
else if (mime.endsWith("/pdf")) doctype = DT_PDFPS;
else if (mime.endsWith("/octet-stream")) doctype = DT_BINARY;
else if (mime.endsWith("/x-shockwave-flash")) doctype = DT_FLASH;
else if (mime.endsWith("/msword")) doctype = DT_DOC;
else if (mime.endsWith("/mspowerpoint")) doctype = DT_DOC;
else if (mime.endsWith("/postscript")) doctype = DT_PDFPS;
else if (mime.startsWith("text/")) doctype = DT_TEXT;
else if (mime.startsWith("image/")) doctype = DT_IMAGE;
else if (mime.startsWith("audio/")) doctype = DT_AUDIO;
else if (mime.startsWith("video/")) doctype = DT_MOVIE;
//bz2 = application/x-bzip2
//dvi = application/x-dvi
//gz = application/gzip
//hqx = application/mac-binhex40
//lha = application/x-lzh
//lzh = application/x-lzh
//pac = application/x-ns-proxy-autoconfig
//php = application/x-httpd-php
//phtml = application/x-httpd-php
//rss = application/xml
//tar = application/tar
//tex = application/x-tex
//tgz = application/tar
//torrent = application/x-bittorrent
//xhtml = application/xhtml+xml
//xla = application/msexcel
//xls = application/msexcel
//xsl = application/xml
//xml = application/xml
//Z = application/x-compress
//zip = application/zip
return doctype;
}
public static void init(File htCachePath, long CacheSizeMax, String layout, boolean migration) {
cachePath = htCachePath;
cacheLayout = layout;
cacheMigration = migration;
maxCacheSize = CacheSizeMax;
// reset old HTCache ?
String[] list = cachePath.list();
if (list != null) {
File object;
for (int i = list.length - 1; i >= 0; i--) {
object = new File(cachePath, list[i]);
if (!object.isDirectory()) { continue; }
if (!object.getName().equals("http") &&
!object.getName().equals("yacy") &&
!object.getName().equals("https") &&
!object.getName().equals("ftp")) {
deleteOldHTCache(cachePath);
break;
}
}
}
File testpath = new File(cachePath, "/http/");
list = testpath.list();
if (list != null) {
File object;
for (int i = list.length - 1; i >= 0; i--) {
object = new File(testpath, list[i]);
if (!object.isDirectory()) { continue; }
if (!object.getName().equals("ip") &&
!object.getName().equals("other") &&
!object.getName().equals("www")) {
deleteOldHTCache(cachePath);
break;
}
}
}
testpath = null;
// set/make cache path
if (!htCachePath.exists()) {
htCachePath.mkdirs();
}
if (!htCachePath.isDirectory()) {
// if the cache does not exists or is a file and not a directory, panic
log.logSevere("the cache path " + htCachePath.toString() + " is not a directory or does not exists and cannot be created");
System.exit(0);
}
// open the response header database
openResponseHeaderDB();
// start the cache startup thread
// this will collect information about the current cache size and elements
try {
cacheScanThread = serverInstantThread.oneTimeJob(Class.forName("de.anomic.plasma.plasmaHTCache"), "cacheScan", log, 120000);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
static void resetResponseHeaderDB() {
if (responseHeaderDB != null) responseHeaderDB.close();
File dbfile = new File(cachePath, DB_NAME);
if (dbfile.exists()) dbfile.delete();
openResponseHeaderDB();
}
private static void openResponseHeaderDB() {
// open the response header database
File dbfile = new File(cachePath, DB_NAME);
responseHeaderDB = new kelondroMapObjects(new kelondroDyn(dbfile, true, true, yacySeedDB.commonHashLength, 150, '#', kelondroBase64Order.enhancedCoder, false, false, true), 500);
}
private static void deleteOldHTCache(File directory) {
String[] list = directory.list();
if (list != null) {
File object;
for (int i = list.length - 1; i >= 0; i--) {
object = new File(directory, list[i]);
if (object.isFile()) {
object.delete();
} else {
deleteOldHTCache(object);
}
}
}
directory.delete();
}
public static int size() {
synchronized (cacheStack) {
return cacheStack.size();
}
}
public static int dbSize() {
return responseHeaderDB.size();
}
public static void push(Entry entry) {
synchronized (cacheStack) {
cacheStack.add(entry);
}
}
public static Entry pop() {
synchronized (cacheStack) {
if (cacheStack.size() > 0)
return cacheStack.removeFirst();
return null;
}
}
/**
* This method changes the HTCache size.<br>
* @param the new cache size in bytes
*/
public static void setCacheSize(long newCacheSize) {
maxCacheSize = newCacheSize;
}
/**
* This method returns the free HTCache size.<br>
* @return the cache size in bytes
*/
public static long getFreeSize() {
return (curCacheSize >= maxCacheSize) ? 0 : maxCacheSize - curCacheSize;
}
public static boolean writeResourceContent(yacyURL url, byte[] array) {
if (array == null) return false;
File file = getCachePath(url);
try {
deleteFile(file);
file.getParentFile().mkdirs();
serverFileUtils.copy(array, file);
} catch (FileNotFoundException e) {
// this is the case of a "(Not a directory)" error, which should be prohibited
// by the shallStoreCache() property. However, sometimes the error still occurs
// In this case do nothing.
log.logSevere("File storage failed (not a directory): " + e.getMessage());
return false;
} catch (IOException e) {
log.logSevere("File storage failed (IO error): " + e.getMessage());
return false;
}
writeFileAnnouncement(file);
return true;
}
private static long lastcleanup = System.currentTimeMillis();
public static void writeFileAnnouncement(File file) {
synchronized (cacheAge) {
if (file.exists()) {
curCacheSize += file.length();
if (System.currentTimeMillis() - lastcleanup > 300000) {
// call the cleanup job only every 5 minutes
cleanup();
lastcleanup = System.currentTimeMillis();
}
cacheAge.put(ageString(file.lastModified(), file), file);
}
}
}
public static boolean deleteURLfromCache(yacyURL url) {
if (deleteFileandDirs(getCachePath(url), "FROM")) {
try {
// As the file is gone, the entry in responseHeader.db is not needed anymore
log.logFinest("Trying to remove responseHeader from URL: " + url.toNormalform(false, true));
responseHeaderDB.remove(url.hash());
} catch (IOException e) {
resetResponseHeaderDB();
log.logInfo("IOExeption removing response header from DB: " + e.getMessage(), e);
}
return true;
}
return false;
}
private static boolean deleteFile(File obj) {
if (obj.exists() && !filesInUse.contains(obj)) {
long size = obj.length();
if (obj.delete()) {
curCacheSize -= size;
return true;
}
}
return false;
}
private static boolean deleteFileandDirs(File obj, String msg) {
if (deleteFile(obj)) {
log.logInfo("DELETED " + msg + " CACHE: " + obj.toString());
obj = obj.getParentFile();
// If the has been emptied, remove it
// Loop as long as we produce empty driectoriers, but stop at HTCACHE
while ((!(obj.equals(cachePath))) && (obj.isDirectory()) && (obj.list().length == 0)) {
if (obj.delete()) log.logFine("DELETED EMPTY DIRECTORY : " + obj.toString());
obj = obj.getParentFile();
}
return true;
}
return false;
}
private static void cleanupDoIt(long newCacheSize) {
File file;
synchronized (cacheAge) {
Iterator<Map.Entry<String, File>> iter = cacheAge.entrySet().iterator();
Map.Entry<String, File> entry;
while (iter.hasNext() && curCacheSize >= newCacheSize) {
if (Thread.currentThread().isInterrupted()) return;
entry = iter.next();
String key = entry.getKey();
file = entry.getValue();
long t = Long.parseLong(key.substring(0, 16), 16);
if (System.currentTimeMillis() - t < 300000) break; // files must have been at least 5 minutes in the cache before they are deleted
if (file != null) {
if (filesInUse.contains(file)) continue;
log.logFinest("Trying to delete [" + key + "] = old file: " + file.toString());
// This needs to be called *before* the file is deleted
String urlHash = getHash(file);
if (deleteFileandDirs(file, "OLD")) {
try {
// As the file is gone, the entry in responseHeader.db is not needed anymore
if (urlHash != null) {
log.logFinest("Trying to remove responseHeader for URLhash: " + urlHash);
responseHeaderDB.remove(urlHash);
} else {
yacyURL url = getURL(file);
if (url != null) {
log.logFinest("Trying to remove responseHeader for URL: " + url.toNormalform(false, true));
responseHeaderDB.remove(url.hash());
}
}
} catch (IOException e) {
log.logInfo("IOExeption removing response header from DB: " + e.getMessage(), e);
}
}
}
iter.remove();
}
}
}
private static void cleanup() {
// clean up cache to have 4% (enough) space for next entries
if (cacheAge.size() > 0 &&
curCacheSize >= maxCacheSize &&
maxCacheSize > 0) {
cleanupDoIt(maxCacheSize - (maxCacheSize / 100) * 4);
}
}
public static void close() {
// closing cache scan if still running
if ((cacheScanThread != null) && (cacheScanThread.isAlive())) {
cacheScanThread.terminate(true);
}
// closing DB
responseHeaderDB.close();
}
private static String ageString(long date, File f) {
StringBuffer sb = new StringBuffer(32);
String s = Long.toHexString(date);
for (int i = s.length(); i < 16; i++) sb.append('0');
sb.append(s);
s = Integer.toHexString(f.hashCode());
for (int i = s.length(); i < 8; i++) sb.append('0');
sb.append(s);
return sb.toString();
}
public static void cacheScan() {
log.logConfig("STARTING HTCACHE SCANNING");
kelondroMScoreCluster<String> doms = new kelondroMScoreCluster<String>();
int fileCount = 0;
enumerateFiles fileEnum = new enumerateFiles(cachePath, true, false, true, true);
File dbfile = new File(cachePath, "responseHeader.db");
while (fileEnum.hasMoreElements()) {
if (Thread.currentThread().isInterrupted()) return;
fileCount++;
File nextFile = (File) fileEnum.nextElement();
long nextFileModDate = nextFile.lastModified();
//System.out.println("Cache: " + dom(f));
doms.incScore(dom(nextFile));
curCacheSize += nextFile.length();
if (!dbfile.equals(nextFile)) cacheAge.put(ageString(nextFileModDate, nextFile), nextFile);
try {
Thread.sleep(10);
} catch (InterruptedException e) {
return;
}
}
//System.out.println("%" + (String) cacheAge.firstKey() + "=" + cacheAge.get(cacheAge.firstKey()));
long ageHours = 0;
if (!cacheAge.isEmpty()) {
Iterator<String> i = cacheAge.keySet().iterator();
if (i.hasNext()) try {
ageHours = (System.currentTimeMillis() - Long.parseLong(i.next().substring(0, 16), 16)) / 3600000;
} catch (NumberFormatException e) {
ageHours = 0;
} else {
ageHours = 0;
}
}
log.logConfig("CACHE SCANNED, CONTAINS " + fileCount +
" FILES = " + curCacheSize/1048576 + "MB, OLDEST IS " +
((ageHours < 24) ? (ageHours + " HOURS") : ((ageHours / 24) + " DAYS")) + " OLD");
cleanup();
log.logConfig("STARTING DNS PREFETCH");
// start to prefetch IPs from DNS
String dom;
long start = System.currentTimeMillis();
String result = "";
fileCount = 0;
while ((doms.size() > 0) && (fileCount < 50) && ((System.currentTimeMillis() - start) < 60000)) {
if (Thread.currentThread().isInterrupted()) return;
dom = (String) doms.getMaxObject();
InetAddress ip = serverDomains.dnsResolve(dom);
if (ip == null) continue;
result += ", " + dom + "=" + ip.getHostAddress();
log.logConfig("PRE-FILLED " + dom + "=" + ip.getHostAddress());
fileCount++;
doms.deleteScore(dom);
// wait a short while to prevent that this looks like a DoS
try {
Thread.sleep(100);
} catch (InterruptedException e) {
return;
}
}
if (result.length() > 2) log.logConfig("PRE-FILLED DNS CACHE, FETCHED " + fileCount +
" ADDRESSES: " + result.substring(2));
}
private static String dom(File f) {
String s = f.toString().substring(cachePath.toString().length() + 1);
int p = s.indexOf("/");
if (p < 0) p = s.indexOf("\\");
if (p < 0) return null;
// remove the protokoll
s = s.substring(p + 1);
p = s.indexOf("/");
if (p < 0) p = s.indexOf("\\");
if (p < 0) return null;
String prefix = new String("");
if (s.startsWith("www")) prefix = new String("www.");
// remove the www|other|ip directory
s = s.substring(p + 1);
p = s.indexOf("/");
if (p < 0) p = s.indexOf("\\");
if (p < 0) return null;
int e = s.indexOf("!");
if ((e > 0) && (e < p)) p = e; // strip port
return prefix + s.substring(0, p);
}
/**
* Returns an object containing metadata about a cached resource
* @param url the {@link URL} of the resource
* @return an {@link IResourceInfo info object}
* @throws <b>IllegalAccessException</b> if the {@link SecurityManager} doesn't allow instantiation
* of the info object with the given protocol
* @throws <b>UnsupportedProtocolException</b> if the protocol is not supported and therefore the
* info object couldn't be created
*/
public static IResourceInfo loadResourceInfo(yacyURL url) throws UnsupportedProtocolException, IllegalAccessException {
// loading data from database
Map<String, String> hdb = responseHeaderDB.getMap(url.hash());
if (hdb == null) return null;
// generate the cached object
IResourceInfo cachedObj = objFactory.buildResourceInfoObj(url, hdb);
return cachedObj;
}
public static ResourceInfoFactory getResourceInfoFactory() {
return objFactory;
}
public static boolean full() {
return (cacheStack.size() > stackLimit);
}
public static boolean empty() {
return (cacheStack.size() == 0);
}
public static boolean isPicture(String mimeType) {
if (mimeType == null) return false;
return mimeType.toUpperCase().startsWith("IMAGE");
}
public static boolean isText(String mimeType) {
// Object ct = response.get(httpHeader.CONTENT_TYPE);
// if (ct == null) return false;
// String t = ((String)ct).toLowerCase();
// return ((t.startsWith("text")) || (t.equals("application/xhtml+xml")));
return plasmaParser.supportedMimeTypesContains(mimeType);
}
public static boolean noIndexingURL(yacyURL url) {
if (url == null) return false;
String urlString = url.toString().toLowerCase();
//http://www.yacy.net/getimage.php?image.png
int idx = urlString.indexOf("?");
if (idx > 0) urlString = urlString.substring(0,idx);
//http://www.yacy.net/getimage.php
idx = urlString.lastIndexOf(".");
if (idx > 0) urlString = urlString.substring(idx+1);
//php
return plasmaParser.mediaExtContains(urlString);
}
/**
* This function moves an old cached object (if it exists) to the new position
*/
private static void moveCachedObject(File oldpath, File newpath) {
try {
if (oldpath.exists() && oldpath.isFile() && (!newpath.exists())) {
long d = oldpath.lastModified();
newpath.getParentFile().mkdirs();
if (oldpath.renameTo(newpath)) {
cacheAge.put(ageString(d, newpath), newpath);
File obj = oldpath.getParentFile();
while ((!(obj.equals(cachePath))) && (obj.isDirectory()) && (obj.list().length == 0)) {
if (obj.delete()) log.logFine("DELETED EMPTY DIRECTORY : " + obj.toString());
obj = obj.getParentFile();
}
}
}
} catch (Exception e) {
log.logFine("moveCachedObject('" + oldpath.toString() + "','" +
newpath.toString() + "')", e);
}
}
private static String replaceRegex(String input, String regex, String replacement) {
if (input == null) { return ""; }
if (input.length() > 0) {
final Pattern searchPattern = Pattern.compile(regex);
final Matcher matcher = searchPattern.matcher(input);
while (matcher.find()) {
input = matcher.replaceAll(replacement);
matcher.reset(input);
}
}
return input;
}
/**
* this method creates from a given host and path a cache path
* from a given host (which may also be an IPv4 - number, but not IPv6 or
* a domain; all without leading 'http://') and a path (which must start
* with a leading '/', and may also end in an '/') a path to a file
* in the file system with root as given in cachePath is constructed
* it will also be ensured, that the complete path exists; if necessary
* that path will be generated
* @return new File
*/
public static File getCachePath(final yacyURL url) {
// this.log.logFinest("plasmaHTCache: getCachePath: IN=" + url.toString());
// peer.yacy || www.peer.yacy = http/yacy/peer
// protocol://www.doamin.net = protocol/www/domain.net
// protocol://other.doamin.net = protocol/other/other.domain.net
// protocol://xxx.xxx.xxx.xxx = protocol/ip/xxx.xxx.xxx.xxx
String host = url.getHost().toLowerCase();
String path = url.getPath();
final String query = url.getQuery();
if (!path.startsWith("/")) { path = "/" + path; }
if (path.endsWith("/") && query == null) { path = path + "ndx"; }
// yes this is not reversible, but that is not needed
path = replaceRegex(path, "/\\.\\./", "/!!/");
path = replaceRegex(path, "(\"|\\\\|\\*|\\?|:|<|>|\\|+)", "_"); // hier wird kein '/' gefiltert
String extention = null;
int d = path.lastIndexOf(".");
int s = path.lastIndexOf("/");
if ((d >= 0) && (d > s)) {
extention = path.substring(d);
} else if (path.endsWith("/ndx")) {
extention = new String (".html"); // Just a wild guess
}
path = path.concat(replaceRegex(query, "(\"|\\\\|\\*|\\?|/|:|<|>|\\|+)", "_"));
// only set NO default ports
int port = url.getPort();
String protocol = url.getProtocol();
if (port >= 0) {
if ((port == 80 && protocol.equals("http" )) ||
(port == 443 && protocol.equals("https")) ||
(port == 21 && protocol.equals("ftp" ))) {
port = -1;
}
}
if (host.endsWith(".yacy")) {
host = host.substring(0, host.length() - 5);
if (host.startsWith("www.")) {
host = host.substring(4);
}
protocol = "yacy";
} else if (host.startsWith("www.")) {
host = "www/" + host.substring(4);
} else if (host.matches("\\d{2,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}")) {
host = "ip/" + host;
} else {
host = "other/" + host;
}
StringBuffer fileName = new StringBuffer();
fileName.append(protocol).append('/').append(host);
if (port >= 0) {
fileName.append('!').append(port);
}
// generate cache path according to storage method
if (cacheLayout.equals("tree")) {
File FileTree = treeFile(fileName, "tree", path);
if (cacheMigration) {
moveCachedObject(hashFile(fileName, "hash", extention, url.hash()), FileTree);
moveCachedObject(hashFile(fileName, null, extention, url.hash()), FileTree); // temporary migration
moveCachedObject(treeFile(fileName, null, path), FileTree); // temporary migration
}
return FileTree;
}
if (cacheLayout.equals("hash")) {
File FileFlat = hashFile(fileName, "hash", extention, url.hash());
if (cacheMigration) {
moveCachedObject(treeFile(fileName, "tree", path), FileFlat);
moveCachedObject(treeFile(fileName, null, path), FileFlat); // temporary migration
moveCachedObject(hashFile(fileName, null, extention, url.hash()), FileFlat); // temporary migration
}
return FileFlat;
}
return null;
}
private static File treeFile(StringBuffer fileName, String prefix, String path) {
StringBuffer f = new StringBuffer(fileName.length() + 30);
f.append(fileName);
if (prefix != null) f.append('/').append(prefix);
f.append(path);
return new File(cachePath, f.toString());
}
private static File hashFile(StringBuffer fileName, String prefix, String extention, String urlhash) {
String hexHash = yacySeed.b64Hash2hexHash(urlhash);
StringBuffer f = new StringBuffer(fileName.length() + 30);
f.append(fileName);
if (prefix != null) f.append('/').append(prefix);
f.append('/').append(hexHash.substring(0,2)).append('/').append(hexHash.substring(2,4)).append('/').append(hexHash);
if (extention != null) fileName.append(extention);
return new File(cachePath, f.toString());
}
/**
* This is a helper function that extracts the Hash from the filename
*/
public static String getHash(final File f) {
if ((!f.isFile()) || (f.getPath().indexOf("hash") < 0)) return null;
String name = f.getName();
if (name.length() < 18) return null; // not a hash file name
String hexHash = name.substring(0,18);
if (hexHash.indexOf('.') >= 0) return null;
try {
String hash = kelondroBase64Order.enhancedCoder.encode(serverCodings.decodeHex(hexHash));
if (hash.length() == yacySeedDB.commonHashLength) return hash;
return null;
} catch (Exception e) {
//log.logWarning("getHash: " + e.getMessage(), e);
return null;
}
}
/**
* this is the reverse function to getCachePath: it constructs the url as string
* from a given storage path
*/
public static yacyURL getURL(final File f) {
// this.log.logFinest("plasmaHTCache: getURL: IN: Path=[" + cachePath + "] File=[" + f + "]");
final String urlHash = getHash(f);
if (urlHash != null) {
yacyURL url = null;
// try the urlPool
try {
url = plasmaSwitchboard.getSwitchboard().getURL(urlHash);
} catch (Exception e) {
log.logWarning("getURL(" + urlHash + "): " /*+ e.getMessage()*/, e);
url = null;
}
if (url != null) return url;
// try responseHeaderDB
Map<String, String> hdb = responseHeaderDB.getMap(urlHash);
if (hdb != null) {
Object origRequestLine = hdb.get(httpHeader.X_YACY_ORIGINAL_REQUEST_LINE);
if ((origRequestLine != null)&&(origRequestLine instanceof String)) {
int i = ((String)origRequestLine).indexOf(" ");
if (i >= 0) {
String s = ((String)origRequestLine).substring(i).trim();
i = s.indexOf(" ");
try {
url = new yacyURL((i<0) ? s : s.substring(0,i), urlHash);
} catch (final Exception e) {
url = null;
}
}
}
}
if (url != null) return url;
}
// If we can't get the correct URL, it seems to be a treeed file
String c = cachePath.toString().replace('\\', '/');
String path = f.toString().replace('\\', '/');
int pos;
if ((pos = path.indexOf("/tree")) >= 0) path = path.substring(0, pos) + path.substring(pos + 5);
if (path.endsWith("ndx")) { path = path.substring(0, path.length() - 3); }
if ((pos = path.lastIndexOf(c)) == 0) {
path = path.substring(pos + c.length());
while (path.startsWith("/")) { path = path.substring(1); }
pos = path.indexOf("!");
if (pos >= 0) {
path = path.substring(0, pos) + ":" + path.substring(pos + 1);
}
String protocol = "http://";
String host = "";
if (path.startsWith("yacy/")) {
path = path.substring(5);
pos = path.indexOf("/");
if (pos > 0) {
host = path.substring(0, pos);
path = path.substring(pos);
} else {
host = path;
path = "";
}
pos = host.indexOf(":");
if (pos > 0) {
host = host.substring(0, pos) + ".yacy" + host.substring(pos);
} else {
host = host + ".yacy";
}
} else {
if (path.startsWith("http/")) {
path = path.substring(5);
} else if (path.startsWith("https/")) {
protocol = "https://";
path = path.substring(6);
} else if (path.startsWith("ftp/")) {
protocol = "ftp://";
path = path.substring(4);
} else {
return null;
}
if (path.startsWith("www/")) {
path = path.substring(4);
host = "www.";
} else if (path.startsWith("other/")) {
path = path.substring(6);
} else if (path.startsWith("ip/")) {
path = path.substring(3);
}
pos = path.indexOf("/");
if (pos > 0) {
host = host + path.substring(0, pos);
path = path.substring(pos);
} else {
host = host + path;
path = "";
}
}
if (!path.equals("")) {
final Pattern pathPattern = Pattern.compile("/!!/");
final Matcher matcher = pathPattern.matcher(path);
while (matcher.find()) {
path = matcher.replaceAll("/\\.\\./");
matcher.reset(path);
}
}
// this.log.logFinest("plasmaHTCache: getURL: OUT=" + s);
try {
return new yacyURL(protocol + host + path, null);
} catch (final Exception e) {
return null;
}
}
return null;
}
/**
* Returns the content of a cached resource as {@link InputStream}
* @param url the requested resource
* @return the resource content as {@link InputStream}. In no data
* is available or the cached file is not readable, <code>null</code>
* is returned.
*/
public static InputStream getResourceContentStream(yacyURL url) {
// load the url as resource from the cache
File f = getCachePath(url);
if (f.exists() && f.canRead()) try {
return new BufferedInputStream(new FileInputStream(f));
} catch (IOException e) {
log.logSevere("Unable to create a BufferedInputStream from file " + f,e);
return null;
}
return null;
}
public static long getResourceContentLength(yacyURL url) {
// load the url as resource from the cache
File f = getCachePath(url);
if (f.exists() && f.canRead()) {
return f.length();
}
return 0;
}
public static Entry newEntry(
Date initDate,
int depth,
yacyURL url,
String name,
String responseStatus,
IResourceInfo docInfo,
String initiator,
plasmaCrawlProfile.entry profile
) {
return new Entry(
initDate,
depth,
url,
name,
responseStatus,
docInfo,
initiator,
profile
);
}
public final static class Entry {
// the class objects
private Date initDate; // the date when the request happened; will be used as a key
private int depth; // the depth of prefetching
private String responseStatus;
private File cacheFile; // the cache file
private byte[] cacheArray; // or the cache as byte-array
private yacyURL url;
private String name; // the name of the link, read as anchor from an <a>-tag
private Date lastModified;
private char doctype;
private String language;
private plasmaCrawlProfile.entry profile;
private String initiator;
/**
* protocolspecific information about the resource
*/
private IResourceInfo resInfo;
protected Entry clone() throws CloneNotSupportedException {
return new Entry(
this.initDate,
this.depth,
this.url,
this.name,
this.responseStatus,
this.resInfo,
this.initiator,
this.profile
);
}
public Entry(Date initDate,
int depth,
yacyURL url,
String name,
String responseStatus,
IResourceInfo resourceInfo,
String initiator,
plasmaCrawlProfile.entry profile
) {
if (resourceInfo == null){
System.out.println("Content information object is null. " + url);
System.exit(0);
}
this.resInfo = resourceInfo;
this.url = url;
this.name = name;
this.cacheFile = getCachePath(this.url);
// assigned:
this.initDate = initDate;
this.depth = depth;
this.responseStatus = responseStatus;
this.profile = profile;
this.initiator = (initiator == null) ? null : ((initiator.length() == 0) ? null : initiator);
// getting the last modified date
this.lastModified = resourceInfo.getModificationDate();
// getting the doctype
this.doctype = docType(resourceInfo.getMimeType());
if (this.doctype == DT_UNKNOWN) this.doctype = docType(url);
this.language = yacyURL.language(url);
// to be defined later:
this.cacheArray = null;
}
public String name() {
// the anchor name; can be either the text inside the anchor tag or the page description after loading of the page
return this.name;
}
public yacyURL url() {
return this.url;
}
public String urlHash() {
return this.url.hash();
}
public Date lastModified() {
return this.lastModified;
}
public String language() {
return this.language;
}
public plasmaCrawlProfile.entry profile() {
return this.profile;
}
public String initiator() {
return this.initiator;
}
public boolean proxy() {
return initiator() == null;
}
public long size() {
if (this.cacheArray == null) return 0;
return this.cacheArray.length;
}
public int depth() {
return this.depth;
}
public yacyURL referrerURL() {
return (this.resInfo == null) ? null : this.resInfo.getRefererUrl();
}
public File cacheFile() {
return this.cacheFile;
}
public void setCacheArray(byte[] data) {
this.cacheArray = data;
}
public byte[] cacheArray() {
return this.cacheArray;
}
public IResourceInfo getDocumentInfo() {
return this.resInfo;
}
public boolean writeResourceInfo() {
if (this.resInfo == null) return false;
try {
HashMap<String, String> hm = new HashMap<String, String>();
hm.putAll(this.resInfo.getMap());
responseHeaderDB.set(this.url.hash(), hm);
} catch (Exception e) {
resetResponseHeaderDB();
return false;
}
return true;
}
public String getMimeType() {
return (this.resInfo == null) ? null : this.resInfo.getMimeType();
}
public Date ifModifiedSince() {
return (this.resInfo == null) ? null : this.resInfo.ifModifiedSince();
}
public boolean requestWithCookie() {
return (this.resInfo == null) ? false : this.resInfo.requestWithCookie();
}
public boolean requestProhibitsIndexing() {
return (this.resInfo == null) ? false : this.resInfo.requestProhibitsIndexing();
}
/*
public boolean update() {
return ((status == CACHE_FILL) || (status == CACHE_STALE_RELOAD_GOOD));
}
*/
// the following three methods for cache read/write granting shall be as loose as possible
// but also as strict as necessary to enable caching of most items
/**
* @return NULL if the answer is TRUE, in case of FALSE, the reason as String is returned
*/
public String shallStoreCacheForProxy() {
// check profile (disabled: we will check this in the plasmaSwitchboard)
//if (!this.profile.storeHTCache()) { return "storage_not_wanted"; }
// decide upon header information if a specific file should be stored to the cache or not
// if the storage was requested by prefetching, the request map is null
// check status code
if ((this.resInfo != null) && (!this.resInfo.validResponseStatus(this.responseStatus))) {
return "bad_status_" + this.responseStatus.substring(0,3);
}
// check storage location
// sometimes a file name is equal to a path name in the same directory;
// or sometimes a file name is equal a directory name created earlier;
// we cannot match that here in the cache file path and therefore omit writing into the cache
if (this.cacheFile.getParentFile().isFile() || this.cacheFile.isDirectory()) { return "path_ambiguous"; }
if (this.cacheFile.toString().indexOf("..") >= 0) { return "path_dangerous"; }
if (this.cacheFile.getAbsolutePath().length() > serverSystem.maxPathLength) { return "path too long"; }
// -CGI access in request
// CGI access makes the page very individual, and therefore not usable in caches
if (this.url.isPOST() && !this.profile.crawlingQ()) { return "dynamic_post"; }
if (this.url.isCGI()) { return "dynamic_cgi"; }
if (this.resInfo != null) {
return this.resInfo.shallStoreCacheForProxy();
}
return null;
}
/**
* decide upon header information if a specific file should be taken from the cache or not
* @return whether the file should be taken from the cache
*/
public boolean shallUseCacheForProxy() {
// -CGI access in request
// CGI access makes the page very individual, and therefore not usable in caches
if (this.url.isPOST()) { return false; }
if (this.url.isCGI()) { return false; }
if (this.resInfo != null) {
return this.resInfo.shallUseCacheForProxy();
}
return true;
}
} // class Entry
}
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