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299 lines
12 KiB
299 lines
12 KiB
// SurrogateReader.java
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// (C) 2009 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 15.04.2009 on http://yacy.net
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//
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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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//
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// LICENSE
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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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package net.yacy.document.content;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.PushbackInputStream;
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import java.io.Reader;
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import java.io.StringReader;
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import java.net.MalformedURLException;
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import java.util.Map;
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import java.util.concurrent.ArrayBlockingQueue;
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import java.util.concurrent.BlockingQueue;
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import javax.xml.parsers.ParserConfigurationException;
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import javax.xml.parsers.SAXParser;
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import javax.xml.parsers.SAXParserFactory;
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import net.yacy.cora.document.encoding.UTF8;
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import net.yacy.cora.document.id.DigestURL;
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import net.yacy.cora.util.ConcurrentLog;
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import net.yacy.crawler.CrawlStacker;
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import net.yacy.search.schema.CollectionConfiguration;
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import org.apache.solr.client.solrj.impl.XMLResponseParser;
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import org.apache.solr.common.SolrDocument;
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import org.apache.solr.common.SolrInputDocument;
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import org.apache.solr.common.util.NamedList;
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import org.xml.sax.Attributes;
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import org.xml.sax.InputSource;
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import org.xml.sax.SAXException;
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import org.xml.sax.SAXParseException;
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import org.xml.sax.helpers.DefaultHandler;
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public class SurrogateReader extends DefaultHandler implements Runnable {
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// definition of the surrogate main element
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public final static String SURROGATES_MAIN_ELEMENT_NAME =
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"surrogates";
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public final static String SURROGATES_MAIN_ELEMENT_OPEN =
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"<" + SURROGATES_MAIN_ELEMENT_NAME +
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" xmlns:dc=\"http://purl.org/dc/elements/1.1/\"" +
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" xmlns:yacy=\"http://yacy.net/\"" +
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" xmlns:geo=\"http://www.w3.org/2003/01/geo/wgs84_pos#\">";
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public final static String SURROGATES_MAIN_ELEMENT_CLOSE =
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"</" + SURROGATES_MAIN_ELEMENT_NAME + ">";
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public final static SolrInputDocument POISON_DOCUMENT = new SolrInputDocument();
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// class variables
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private final StringBuilder buffer;
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private boolean parsingValue;
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private DCEntry dcEntry;
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private String elementName;
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private final BlockingQueue<SolrInputDocument> surrogates;
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private SAXParser saxParser;
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private final InputSource inputSource;
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private final PushbackInputStream inputStream;
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private final CrawlStacker crawlStacker;
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private final CollectionConfiguration configuration;
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private final int concurrency;
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private static final ThreadLocal<SAXParser> tlSax = new ThreadLocal<SAXParser>();
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private static SAXParser getParser() throws SAXException {
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SAXParser parser = tlSax.get();
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if (parser == null) {
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try {
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parser = SAXParserFactory.newInstance().newSAXParser();
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} catch (final ParserConfigurationException e) {
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throw new SAXException(e.getMessage(), e);
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}
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tlSax.set(parser);
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}
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return parser;
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}
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public SurrogateReader(final InputStream stream, int queueSize, CrawlStacker crawlStacker, CollectionConfiguration configuration, int concurrency) throws IOException {
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this(new PushbackInputStream(stream, 200), queueSize, crawlStacker, configuration, concurrency);
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}
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public SurrogateReader(final PushbackInputStream stream, int queueSize, CrawlStacker crawlStacker, CollectionConfiguration configuration, int concurrency) throws IOException {
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this.crawlStacker = crawlStacker;
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this.configuration = configuration;
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this.concurrency = concurrency;
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this.buffer = new StringBuilder(300);
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this.parsingValue = false;
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this.dcEntry = null;
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this.elementName = null;
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this.surrogates = new ArrayBlockingQueue<>(queueSize);
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Reader reader = new BufferedReader(new InputStreamReader(stream, "UTF-8"));
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this.inputSource = new InputSource(reader);
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this.inputSource.setEncoding("UTF-8");
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this.inputStream = stream;
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try {
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this.saxParser = getParser();
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} catch (final SAXException e) {
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ConcurrentLog.logException(e);
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throw new IOException(e.getMessage());
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}
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}
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@Override
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public void run() {
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// test the syntax of the stream by reading parts of the beginning
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try {
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if (isSolrDump()) {
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BufferedReader br = new BufferedReader(new InputStreamReader(this.inputStream, "UTF-8"));
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String line;
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while ((line = br.readLine()) != null) {
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if (!line.startsWith("<doc>")) continue;
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try {
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NamedList<Object> nl = new XMLResponseParser().processResponse(new StringReader("<result>" + line + "</result>")); //
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SolrDocument doc = (SolrDocument) nl.iterator().next().getValue();
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// check if url is in accepted domain
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String u = (String) doc.getFieldValue("sku");
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if (u != null) {
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try {
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DigestURL url = new DigestURL(u);
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final String urlRejectReason = this.crawlStacker.urlInAcceptedDomain(url);
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if ( urlRejectReason == null ) {
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// convert DCEntry to SolrInputDocument
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this.surrogates.put(this.configuration.toSolrInputDocument(doc));
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}
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} catch (MalformedURLException e) {
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}
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}
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} catch (Throwable ee) {
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// bad line
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}
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}
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} else {
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this.saxParser.parse(this.inputSource, this);
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}
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} catch (final SAXParseException e) {
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ConcurrentLog.logException(e);
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} catch (final SAXException e) {
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ConcurrentLog.logException(e);
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} catch (final IOException e) {
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ConcurrentLog.logException(e);
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} finally {
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for (int i = 0; i < this.concurrency; i++) {
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try {
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this.surrogates.put(POISON_DOCUMENT);
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} catch (final InterruptedException e1) {
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ConcurrentLog.logException(e1);
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}
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}
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try {
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this.inputStream.close();
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} catch (final IOException e) {
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ConcurrentLog.logException(e);
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}
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}
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}
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private boolean isSolrDump() {
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try {
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byte[] b = new byte[100];
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this.inputStream.read(b);
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try {
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String s = UTF8.String(b);
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if ((s.contains("<response>") && s.contains("<result>")) || s.startsWith("<doc>")) {
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this.inputStream.unread(b);
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return true;
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}
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} catch (IOException e) {
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ConcurrentLog.logException(e);
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this.inputStream.unread(b);
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return false;
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}
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} catch (IOException e) {
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ConcurrentLog.logException(e);
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return false;
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}
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return false;
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}
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@Override
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public void startElement(final String uri, final String name, String tag, final Attributes atts) throws SAXException {
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if (tag == null) return;
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tag = tag.toLowerCase();
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if ("record".equals(tag) || "document".equals(tag) || "doc".equals(tag)) {
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this.dcEntry = new DCEntry();
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} else if ("element".equals(tag) || "str".equals(tag) || "int".equals(tag) || "bool".equals(tag) || "long".equals(tag)) {
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this.elementName = atts.getValue("name");
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this.parsingValue = true;
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} else if ("value".equals(tag)) {
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this.buffer.setLength(0);
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this.parsingValue = true;
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} else if (tag.startsWith("dc:") || tag.startsWith("geo:") || tag.startsWith("md:")) {
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// parse dublin core attribute
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this.elementName = tag;
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this.parsingValue = true;
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}
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}
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@Override
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public void endElement(final String uri, final String name, String tag) {
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if (tag == null) return;
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tag = tag.toLowerCase();
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if ("record".equals(tag) || "document".equals(tag) || "doc".equals(tag)) {
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//System.out.println("A Title: " + this.surrogate.title());
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try {
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// check if url is in accepted domain
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final String urlRejectReason = this.crawlStacker.urlInAcceptedDomain(this.dcEntry.getIdentifier(true));
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if ( urlRejectReason == null ) {
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// convert DCEntry to SolrInputDocument
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this.surrogates.put(this.configuration.toSolrInputDocument(this.dcEntry));
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}
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} catch (final InterruptedException e) {
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ConcurrentLog.logException(e);
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} finally {
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//System.out.println("B Title: " + this.surrogate.title());
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this.dcEntry = null;
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this.buffer.setLength(0);
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this.parsingValue = false;
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}
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} else if ("element".equals(tag)) {
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this.buffer.setLength(0);
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this.parsingValue = false;
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} else if ("str".equals(tag) || "int".equals(tag) || "bool".equals(tag) || "long".equals(tag)){
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final String value = buffer.toString().trim();
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if (this.elementName != null) {
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this.dcEntry.getMap().put(this.elementName, new String[]{value});
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}
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this.buffer.setLength(0);
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this.parsingValue = false;
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} else if ("value".equals(tag)) {
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//System.out.println("BUFFER-SIZE=" + buffer.length());
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final String value = buffer.toString().trim();
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if (this.elementName != null) {
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this.dcEntry.getMap().put(this.elementName, new String[]{value});
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}
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this.buffer.setLength(0);
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this.parsingValue = false;
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} else if (tag.startsWith("dc:") || tag.startsWith("geo:") || tag.startsWith("md:")) {
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final String value = buffer.toString().trim();
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if (this.elementName != null && tag.equals(this.elementName)) {
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Map<String,String[]> map = this.dcEntry.getMap();
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String[] oldcontent = map.get(this.elementName);
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if (oldcontent == null || oldcontent.length == 0) {
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map.put(this.elementName, new String[]{value});
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} else {
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String[] newcontent = new String[oldcontent.length + 1];
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System.arraycopy(oldcontent, 0, newcontent, 0, oldcontent.length);
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newcontent[oldcontent.length] = value;
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map.put(this.elementName, newcontent);
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}
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}
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this.buffer.setLength(0);
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this.parsingValue = false;
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}
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}
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@Override
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public void characters(final char ch[], final int start, final int length) {
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if (parsingValue) {
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buffer.append(ch, start, length);
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}
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}
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public SolrInputDocument take() {
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try {
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return this.surrogates.take();
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} catch (final InterruptedException e) {
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ConcurrentLog.logException(e);
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return null;
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}
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}
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}
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