mirror of
https://github.com/yacy/yacy_search_server.git
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112c5d3332
git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@382 6c8d7289-2bf4-0310-a012-ef5d649a1542
447 lines
19 KiB
Java
447 lines
19 KiB
Java
// plasmaSwitchboardQueueEntry.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, 2005
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// last major change: 04.07.2005
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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.plasma;
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import java.io.File;
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import java.io.IOException;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.util.Date;
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import de.anomic.htmlFilter.htmlFilterContentScraper;
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import de.anomic.http.httpHeader;
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import de.anomic.kelondro.kelondroStack;
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import de.anomic.server.serverCodings;
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import de.anomic.yacy.yacySeedDB;
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public class plasmaSwitchboardQueue {
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private kelondroStack sbQueueStack;
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private plasmaCrawlProfile profiles;
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private plasmaHTCache htCache;
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private plasmaCrawlLURL lurls;
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public plasmaSwitchboardQueue(plasmaHTCache htCache, plasmaCrawlLURL lurls, File sbQueueStackPath, int bufferkb, plasmaCrawlProfile profiles) throws IOException {
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this.profiles = profiles;
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this.htCache = htCache;
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this.lurls = lurls;
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if (sbQueueStackPath.exists())
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sbQueueStack = new kelondroStack(sbQueueStackPath, 0);
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else
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sbQueueStack = new kelondroStack(sbQueueStackPath, 0, new int[] {
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plasmaURL.urlStringLength,
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plasmaURL.urlHashLength,
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11,
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1,
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yacySeedDB.commonHashLength,
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plasmaURL.urlCrawlDepthLength,
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plasmaURL.urlCrawlProfileHandleLength,
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plasmaURL.urlForkFactorLength,
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plasmaURL.urlForkFactorLength,
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plasmaURL.urlDescrLength
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});
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}
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public int size() {
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return sbQueueStack.size();
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}
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public void push(Entry entry) throws IOException {
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sbQueueStack.push(new byte[][]{
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entry.url.toString().getBytes(),
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(entry.referrerHash == null) ? plasmaURL.dummyHash.getBytes() : entry.referrerHash.getBytes(),
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serverCodings.enhancedCoder.encodeBase64Long((entry.ifModifiedSince == null) ? 0 : entry.ifModifiedSince.getTime(), 11).getBytes(),
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new byte[entry.flags],
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(entry.initiator == null) ? plasmaURL.dummyHash.getBytes() : entry.initiator.getBytes(),
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serverCodings.enhancedCoder.encodeBase64Long((long) entry.depth, plasmaURL.urlCrawlDepthLength).getBytes(),
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(entry.profileHandle == null) ? plasmaURL.dummyHash.getBytes() : entry.profileHandle.getBytes(),
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serverCodings.enhancedCoder.encodeBase64Long((long) entry.hrefCount, plasmaURL.urlForkFactorLength).getBytes(),
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serverCodings.enhancedCoder.encodeBase64Long((long) entry.imageCount, plasmaURL.urlForkFactorLength).getBytes(),
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(entry.anchorName == null) ? "-".getBytes() : entry.anchorName.getBytes()
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});
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}
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public Entry pop() throws IOException {
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if (sbQueueStack.size() == 0) return null;
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return new Entry(sbQueueStack.pot());
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}
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public Entry get(int index) throws IOException {
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if ((index < 0) || (index >= sbQueueStack.size())) throw new ArrayIndexOutOfBoundsException();
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return new Entry(sbQueueStack.bot(index));
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}
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public void close() {
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if (sbQueueStack != null) try {
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sbQueueStack.close();
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} catch (IOException e) {
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}
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sbQueueStack = null;
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}
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public void finalize() {
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close();
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}
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public Entry newEntry(URL url, String referrer, Date ifModifiedSince, boolean requestWithCookie,
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String initiator, int depth, String profilehandle,
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int hrefCount, int imageCount, String anchorName) {
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return new Entry(url, referrer, ifModifiedSince, requestWithCookie, initiator, depth, profilehandle, hrefCount, imageCount, anchorName);
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}
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public class Entry {
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private URL url; // plasmaURL.urlStringLength
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private String referrerHash; // plasmaURL.urlHashLength
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private Date ifModifiedSince; // 6
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private byte flags; // 1
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private String initiator; // yacySeedDB.commonHashLength
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private int depth; // plasmaURL.urlCrawlDepthLength
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private String profileHandle; // plasmaURL.urlCrawlProfileHandleLength
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private int hrefCount; // plasmaURL.urlForkFactorLength
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private int imageCount; // plasmaURL.urlForkFactorLength
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private String anchorName; // plasmaURL.urlDescrLength
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// computed values
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private plasmaCrawlProfile.entry profileEntry;
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private httpHeader responseHeader;
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private URL referrerURL;
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public Entry(URL url, String referrer, Date ifModifiedSince, boolean requestWithCookie,
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String initiator, int depth, String profileHandle,
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int hrefCount, int imageCount, String anchorName) {
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this.url = url;
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this.referrerHash = referrer;
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this.ifModifiedSince = ifModifiedSince;
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this.flags = (requestWithCookie) ? (byte) 1 : (byte) 0;
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this.initiator = initiator;
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this.depth = depth;
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this.profileHandle = profileHandle;
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this.hrefCount = hrefCount;
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this.imageCount = imageCount;
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this.anchorName = anchorName;
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this.profileEntry = null;
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this.responseHeader = null;
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this.referrerURL = null;
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}
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public Entry(byte[][] row) {
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long ims = serverCodings.enhancedCoder.decodeBase64Long(new String(row[2]));
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byte flags = row[3][0];
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try {
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this.url = new URL(new String(row[0]));
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} catch (MalformedURLException e) {
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this.url = null;
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}
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this.referrerHash = new String(row[1]);
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this.ifModifiedSince = (ims == 0) ? null : new Date(ims);
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this.flags = ((flags & 1) == 1) ? (byte) 1 : (byte) 0;
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this.initiator = new String(row[4]);
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this.depth = (int) serverCodings.enhancedCoder.decodeBase64Long(new String(row[5]));
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this.profileHandle = new String(row[6]);
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this.hrefCount = (int) serverCodings.enhancedCoder.decodeBase64Long(new String(row[7]));
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this.imageCount = (int) serverCodings.enhancedCoder.decodeBase64Long(new String(row[8]));
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this.anchorName = new String(row[9]);
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this.profileEntry = null;
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this.responseHeader = null;
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this.referrerURL = null;
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}
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public URL url() {
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return url;
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}
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public String normalizedURLString() {
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return htmlFilterContentScraper.urlNormalform(url);
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}
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public String urlHash() {
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return plasmaURL.urlHash(url);
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}
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public boolean requestedWithCookie() {
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return (flags & 1) == 1;
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}
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public File cacheFile() {
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return htCache.getCachePath(url);
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}
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public boolean proxy() {
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return (initiator == null) || (initiator.equals(plasmaURL.dummyHash));
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}
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public String initiator() {
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return initiator;
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}
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public int depth() {
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return depth;
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}
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public long size() {
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if (cacheFile().exists()) return cacheFile().length(); else return 0;
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}
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public plasmaCrawlProfile.entry profile() {
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if (profileEntry == null) profileEntry = profiles.getEntry(profileHandle);
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return profileEntry;
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}
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public httpHeader responseHeader() {
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if (responseHeader == null) try {
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responseHeader = htCache.getCachedResponse(plasmaURL.urlHash(url));
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} catch (IOException e) {
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e.printStackTrace();
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return null;
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}
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return responseHeader;
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}
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public URL referrerURL() {
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if (referrerURL == null) {
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if ((referrerHash == null) || (referrerHash.equals(plasmaURL.dummyHash))) return null;
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referrerURL = lurls.getEntry(referrerHash).url();
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}
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return referrerURL;
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}
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public int forkFactor() {
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return hrefCount;
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}
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public int images() {
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return imageCount;
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}
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public String anchorName() {
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return anchorName;
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}
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public String shallIndexCacheForProxy() {
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// decide upon header information if a specific file should be indexed
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// this method returns null if the answer is 'YES'!
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// if the answer is 'NO' (do not index), it returns a string with the reason
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// to reject the crawling demand in clear text
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// check profile
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if (!(profile().localIndexing())) return "Indexing_Not_Allowed";
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// -CGI access in request
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// CGI access makes the page very individual, and therefore not usable in caches
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if ((plasmaHTCache.isPOST(normalizedURLString())) && (!(profile().crawlingQ()))) return "Dynamic_(POST)";
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if ((plasmaHTCache.isCGI(normalizedURLString())) && (!(profile().crawlingQ()))) return "Dynamic_(CGI)";
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// -authorization cases in request
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// we checked that in shallStoreCache
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// -ranges in request
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// we checked that in shallStoreCache
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// a picture cannot be indexed
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if (plasmaHTCache.noIndexingURL(normalizedURLString())) return "Media_Content_(forbidden)";
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// -cookies in request
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// unfortunately, we cannot index pages which have been requested with a cookie
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// because the returned content may be special for the client
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if (requestedWithCookie()) {
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//System.out.println("***not indexed because cookie");
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return "Dynamic_(Requested_With_Cookie)";
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}
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// -set-cookie in response
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// the set-cookie from the server does not indicate that the content is special
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// thus we do not care about it here for indexing
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if (responseHeader() != null) {
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// a picture cannot be indexed
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if (plasmaHTCache.isPicture(responseHeader())) return "Media_Content_(Picture)";
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if (!(plasmaHTCache.isText(responseHeader()))) return "Media_Content_(not_text)";
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// -if-modified-since in request
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// if the page is fresh at the very moment we can index it
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if ((ifModifiedSince != null) && (responseHeader().containsKey(httpHeader.LAST_MODIFIED))) {
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// parse date
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Date d = responseHeader().lastModified();
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if (d == null) d = new Date();
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// finally, we shall treat the cache as stale if the modification time is after the if-.. time
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if (d.after(ifModifiedSince)) {
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//System.out.println("***not indexed because if-modified-since");
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return "Stale_(Last-Modified>Modified-Since)";
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}
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}
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// -pragma in cached response
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if ((responseHeader().containsKey(httpHeader.PRAGMA)) &&
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(((String) responseHeader().get(httpHeader.PRAGMA)).toUpperCase().equals("NO-CACHE"))) return "Denied_(pragma_no_cache)";
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// see for documentation also:
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// http://www.web-caching.com/cacheability.html
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// calculate often needed values for freshness attributes
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Date date = responseHeader().date();
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Date expires = responseHeader().expires();
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Date lastModified = responseHeader().lastModified();
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String cacheControl = (String) responseHeader.get(httpHeader.CACHE_CONTROL);
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// look for freshnes information
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// -expires in cached response
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// the expires value gives us a very easy hint when the cache is stale
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// sometimes, the expires date is set to the past to prevent that a page is cached
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// we use that information to see if we should index it
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if (expires != null) {
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Date yesterday = new Date((new Date()).getTime() - plasmaHTCache.oneday);
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if (expires.before(yesterday)) return "Stale_(Expired)";
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}
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// -lastModified in cached response
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// this information is too weak to use it to prevent indexing
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// even if we can apply a TTL heuristic for cache usage
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// -cache-control in cached response
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// the cache-control has many value options.
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if (cacheControl != null) {
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cacheControl = cacheControl.trim().toUpperCase();
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/* we have the following cases for cache-control:
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"public" -- can be indexed
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"private", "no-cache", "no-store" -- cannot be indexed
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"max-age=<delta-seconds>" -- stale/fresh dependent on date
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*/
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if (cacheControl.startsWith("PUBLIC")) {
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// ok, do nothing
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} else if ((cacheControl.startsWith("PRIVATE")) ||
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(cacheControl.startsWith("NO-CACHE")) ||
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(cacheControl.startsWith("NO-STORE"))) {
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// easy case
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return "Stale_(denied_by_cache-control=" + cacheControl+ ")";
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} else if (cacheControl.startsWith("MAX-AGE=")) {
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// we need also the load date
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if (date == null) return "Stale_(no_date_given_in_response)";
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try {
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long ttl = 1000 * Long.parseLong(cacheControl.substring(8)); // milliseconds to live
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if ((new Date()).getTime() - date.getTime() > ttl) {
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//System.out.println("***not indexed because cache-control");
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return "Stale_(expired_by_cache-control)";
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}
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} catch (Exception e) {
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return "Error_(" + e.getMessage() + ")";
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}
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}
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}
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}
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return null;
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}
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public String shallIndexCacheForCrawler() {
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// decide upon header information if a specific file should be indexed
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// this method returns null if the answer is 'YES'!
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// if the answer is 'NO' (do not index), it returns a string with the reason
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// to reject the crawling demand in clear text
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// check profile
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if (!(profile().localIndexing())) return "Indexing_Not_Allowed";
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// -CGI access in request
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// CGI access makes the page very individual, and therefore not usable in caches
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if ((plasmaHTCache.isPOST(normalizedURLString())) && (!(profile().crawlingQ()))) return "Dynamic_(POST)";
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if ((plasmaHTCache.isCGI(normalizedURLString())) && (!(profile().crawlingQ()))) return "Dynamic_(CGI)";
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// -authorization cases in request
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// we checked that in shallStoreCache
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// -ranges in request
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// we checked that in shallStoreCache
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// a picture cannot be indexed
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if (responseHeader() != null) {
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if (plasmaHTCache.isPicture(responseHeader())) return "Media_Content_(Picture)";
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if (!(plasmaHTCache.isText(responseHeader()))) return "Media_Content_(not_text)";
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}
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if (plasmaHTCache.noIndexingURL(normalizedURLString())) return "Media_Content_(forbidden)";
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// -if-modified-since in request
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// if the page is fresh at the very moment we can index it
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// -> this does not apply for the crawler
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// -cookies in request
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// unfortunately, we cannot index pages which have been requested with a cookie
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// because the returned content may be special for the client
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// -> this does not apply for a crawler
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// -set-cookie in response
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// the set-cookie from the server does not indicate that the content is special
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// thus we do not care about it here for indexing
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// -> this does not apply for a crawler
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// -pragma in cached response
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// -> in the crawler we ignore this
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// look for freshnes information
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// -expires in cached response
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// the expires value gives us a very easy hint when the cache is stale
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// sometimes, the expires date is set to the past to prevent that a page is cached
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// we use that information to see if we should index it
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// -> this does not apply for a crawler
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// -lastModified in cached response
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// this information is too weak to use it to prevent indexing
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// even if we can apply a TTL heuristic for cache usage
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// -cache-control in cached response
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// the cache-control has many value options.
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// -> in the crawler we ignore this
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return null;
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}
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}
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}
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