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406 lines
23 KiB
406 lines
23 KiB
/**
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* SolrSelectServlet
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* Copyright 2012 by Michael Peter Christen
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* First released 23.08.2012 at http://yacy.net
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program in the file lgpl21.txt
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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package net.yacy.http.servlets;
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import java.io.IOException;
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import java.io.OutputStreamWriter;
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import java.io.PrintWriter;
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import java.io.StringWriter;
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import java.io.Writer;
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import java.nio.charset.StandardCharsets;
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import java.util.Date;
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import java.util.HashMap;
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import java.util.Map;
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import javax.servlet.ServletException;
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import javax.servlet.ServletRequest;
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import javax.servlet.ServletResponse;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import net.yacy.cora.federate.solr.Ranking;
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import net.yacy.cora.federate.solr.connector.EmbeddedSolrConnector;
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import net.yacy.cora.federate.solr.connector.SolrConnector;
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import net.yacy.cora.federate.solr.responsewriter.EmbeddedSolrResponseWriter;
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import net.yacy.cora.federate.solr.responsewriter.EnhancedXMLResponseWriter;
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import net.yacy.cora.federate.solr.responsewriter.GrepHTMLResponseWriter;
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import net.yacy.cora.federate.solr.responsewriter.HTMLResponseWriter;
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import net.yacy.cora.federate.solr.responsewriter.OpensearchResponseWriter;
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import net.yacy.cora.federate.solr.responsewriter.SnapshotImagesReponseWriter;
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import net.yacy.cora.federate.solr.responsewriter.SolrjResponseWriter;
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import net.yacy.cora.federate.solr.responsewriter.YJsonResponseWriter;
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import net.yacy.cora.protocol.RequestHeader;
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import net.yacy.cora.util.ConcurrentLog;
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import net.yacy.data.UserDB;
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import net.yacy.search.Switchboard;
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import net.yacy.search.SwitchboardConstants;
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import net.yacy.search.query.AccessTracker;
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import net.yacy.search.query.QueryGoal;
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import net.yacy.search.query.QueryModifier;
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import net.yacy.search.query.SearchEvent;
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import net.yacy.search.schema.CollectionSchema;
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import net.yacy.search.schema.WebgraphSchema;
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import org.apache.commons.lang.StringUtils;
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import org.apache.solr.client.solrj.response.QueryResponse;
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import org.apache.solr.common.SolrDocumentList;
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import org.apache.solr.common.SolrException;
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import org.apache.solr.common.params.CommonParams;
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import org.apache.solr.common.params.DisMaxParams;
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import org.apache.solr.common.params.ModifiableSolrParams;
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import org.apache.solr.common.params.MultiMapSolrParams;
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import org.apache.solr.common.util.NamedList;
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import org.apache.solr.common.util.SimpleOrderedMap;
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import org.apache.solr.core.SolrCore;
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import org.apache.solr.request.SolrQueryRequest;
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import org.apache.solr.request.SolrQueryRequestBase;
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import org.apache.solr.response.BinaryResponseWriter;
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import org.apache.solr.response.CSVResponseWriter;
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import org.apache.solr.response.QueryResponseWriter;
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import org.apache.solr.response.RawResponseWriter;
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import org.apache.solr.response.ResultContext;
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import org.apache.solr.response.SolrQueryResponse;
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import org.apache.solr.response.XSLTResponseWriter;
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import org.apache.solr.search.DocList;
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import org.apache.solr.servlet.SolrRequestParsers;
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import org.apache.solr.servlet.cache.HttpCacheHeaderUtil;
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import org.apache.solr.servlet.cache.Method;
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/*
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* taken from the Solr 3.6.0 code, which is now deprecated;
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* this is now done in Solr 4.x.x with org.apache.solr.servlet.SolrDispatchFilter
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* implemented as servlet
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*/
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public class SolrSelectServlet extends HttpServlet {
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private static final long serialVersionUID = 1L;
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public final Map<String, QueryResponseWriter> RESPONSE_WRITER = new HashMap<String, QueryResponseWriter>();
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/**
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* Default initialization, adds additional and custom result response writers
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* in addition to the Solr default writers.
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*/
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@Override
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public void init() {
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RESPONSE_WRITER.putAll(SolrCore.DEFAULT_RESPONSE_WRITERS);
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XSLTResponseWriter xsltWriter = new XSLTResponseWriter();
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OpensearchResponseWriter opensearchResponseWriter = new OpensearchResponseWriter();
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NamedList<?> initArgs = new NamedList<>();
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xsltWriter.init(initArgs);
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RESPONSE_WRITER.put("xslt", xsltWriter); // try i.e. http://localhost:8090/solr/select?q=*:*&start=0&rows=10&wt=xslt&tr=json.xsl
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RESPONSE_WRITER.put("exml", new EnhancedXMLResponseWriter());
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RESPONSE_WRITER.put("html", new HTMLResponseWriter());
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RESPONSE_WRITER.put("snapshots", new SnapshotImagesReponseWriter());
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RESPONSE_WRITER.put("grephtml", new GrepHTMLResponseWriter());
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RESPONSE_WRITER.put("rss", opensearchResponseWriter); //try http://localhost:8090/solr/select?wt=rss&q=olympia&hl=true&hl.fl=text_t,h1,h2
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RESPONSE_WRITER.put("opensearch", opensearchResponseWriter); //try http://localhost:8090/solr/select?wt=rss&q=olympia&hl=true&hl.fl=text_t,h1,h2
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RESPONSE_WRITER.put("yjson", new YJsonResponseWriter()); //try http://localhost:8090/solr/select?wt=yjson&q=olympia&hl=true&hl.fl=text_t,h1,h2
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}
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@Override
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public void service(ServletRequest request, ServletResponse response) throws IOException, ServletException {
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HttpServletRequest hrequest = (HttpServletRequest) request;
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HttpServletResponse hresponse = (HttpServletResponse) response;
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SolrQueryRequest req = null;
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final Method reqMethod = Method.getMethod(hrequest.getMethod());
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Writer out = null;
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try {
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// prepare request to solr
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MultiMapSolrParams mmsp = SolrRequestParsers.parseQueryString(hrequest.getQueryString());
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Switchboard sb = Switchboard.getSwitchboard();
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// TODO: isUserInRole needs a login to jetty container (not done automatically on admin from localhost)
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boolean authenticated = hrequest.isUserInRole(UserDB.AccessRight.ADMIN_RIGHT.toString());
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// count remote searches if this was part of a p2p search
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if (mmsp.getMap().containsKey("partitions")) {
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final int partitions = mmsp.getInt("partitions", 30);
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sb.searchQueriesGlobal += 1.0f / partitions; // increase query counter
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}
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// get the ranking profile id
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int profileNr = mmsp.getInt("profileNr", 0);
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// rename post fields according to result style
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String querystring = "";
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if (!mmsp.getMap().containsKey(CommonParams.Q) && mmsp.getMap().containsKey(CommonParams.QUERY)) {
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querystring = mmsp.get(CommonParams.QUERY, "");
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mmsp.getMap().remove(CommonParams.QUERY);
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QueryModifier modifier = new QueryModifier(0);
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querystring = modifier.parse(querystring);
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modifier.apply(mmsp);
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QueryGoal qg = new QueryGoal(querystring);
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StringBuilder solrQ = qg.collectionTextQuery();
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mmsp.getMap().put(CommonParams.Q, new String[]{solrQ.toString()}); // sru patch
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// experimental p2p enrichment if flag to do so is set
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/*
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final String p2pQuery = querystring;
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new Thread() {
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@Override
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public void run() {
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FederateSearchManager.getManager().query(p2pQuery);
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}
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}.start();
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*/
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}
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String q = mmsp.get(CommonParams.Q, "");
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ConcurrentLog.info("SolrSelect", "client=" + RequestHeader.client(request) + " q=" + q); // to detect bots and dos
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if (querystring.length() == 0) querystring = q;
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if (!mmsp.getMap().containsKey(CommonParams.START)) {
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int startRecord = mmsp.getFieldInt("startRecord", null, CommonParams.START_DEFAULT);
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mmsp.getMap().remove("startRecord");
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mmsp.getMap().put(CommonParams.START, new String[]{Integer.toString(startRecord)}); // sru patch
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}
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if (!mmsp.getMap().containsKey(CommonParams.ROWS)) {
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int maximumRecords = mmsp.getFieldInt("maximumRecords", null, CommonParams.ROWS_DEFAULT);
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mmsp.getMap().remove("maximumRecords");
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mmsp.getMap().put(CommonParams.ROWS, new String[]{Integer.toString(maximumRecords)}); // sru patch
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}
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mmsp.getMap().put(CommonParams.ROWS, new String[]{Integer.toString(Math.min(mmsp.getInt(CommonParams.ROWS, CommonParams.ROWS_DEFAULT), (authenticated) ? 100000000 : 100))});
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boolean zeroDoc = mmsp.getInt(CommonParams.ROWS, CommonParams.ROWS_DEFAULT) < 1;
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boolean multiDoc = mmsp.getInt(CommonParams.ROWS, CommonParams.ROWS_DEFAULT) > 1;
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// set ranking according to profile number if ranking attributes are not given in the request
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Ranking ranking = sb.index.fulltext().getDefaultConfiguration().getRanking(profileNr);
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if (multiDoc && !mmsp.getMap().containsKey(CommonParams.SORT) && !mmsp.getMap().containsKey(DisMaxParams.BQ) && !mmsp.getMap().containsKey(DisMaxParams.BF) && !mmsp.getMap().containsKey("boost")) {
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if (!mmsp.getMap().containsKey("defType")) mmsp.getMap().put("defType", new String[]{"edismax"});
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String fq = ranking.getFilterQuery();
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String bq = ranking.getBoostQuery();
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String bf = ranking.getBoostFunction();
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if (fq.length() > 0) mmsp.getMap().put(CommonParams.FQ, new String[]{fq});
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if (bq.length() > 0) mmsp.getMap().put(DisMaxParams.BQ, StringUtils.split(bq,"\t\n\r\f")); // bq split into multiple query params, allowing space in single query
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if (bf.length() > 0) mmsp.getMap().put("boost", new String[]{bf}); // a boost function extension, see http://wiki.apache.org/solr/ExtendedDisMax#bf_.28Boost_Function.2C_additive.29
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}
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// get a response writer for the result
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String wt = mmsp.get(CommonParams.WT, "xml"); // maybe use /solr/select?q=*:*&start=0&rows=10&wt=exml
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QueryResponseWriter responseWriter = RESPONSE_WRITER.get(wt);
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if (responseWriter == null) throw new ServletException("no response writer");
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if (responseWriter instanceof OpensearchResponseWriter) {
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// set the title every time, it is possible that it has changed
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final String promoteSearchPageGreeting =
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(sb.getConfigBool(SwitchboardConstants.GREETING_NETWORK_NAME, false)) ? sb.getConfig(
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"network.unit.description",
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"") : sb.getConfig(SwitchboardConstants.GREETING, "");
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((OpensearchResponseWriter) responseWriter).setTitle(promoteSearchPageGreeting);
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}
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// if this is a call to YaCys special search formats, enhance the query with field assignments
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if (!zeroDoc && (responseWriter instanceof YJsonResponseWriter || responseWriter instanceof OpensearchResponseWriter) && "true".equals(mmsp.get("hl", "true"))) {
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// add options for snippet generation
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if (!mmsp.getMap().containsKey("hl.q")) mmsp.getMap().put("hl.q", new String[]{q});
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if (!mmsp.getMap().containsKey("hl.fl")) mmsp.getMap().put("hl.fl", new String[]{CollectionSchema.description_txt.getSolrFieldName() + "," + CollectionSchema.h4_txt.getSolrFieldName() + "," + CollectionSchema.h3_txt.getSolrFieldName() + "," + CollectionSchema.h2_txt.getSolrFieldName() + "," + CollectionSchema.h1_txt.getSolrFieldName() + "," + CollectionSchema.text_t.getSolrFieldName()});
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if (!mmsp.getMap().containsKey("hl.alternateField")) mmsp.getMap().put("hl.alternateField", new String[]{CollectionSchema.description_txt.getSolrFieldName()});
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if (!mmsp.getMap().containsKey("hl.simple.pre")) mmsp.getMap().put("hl.simple.pre", new String[]{"<b>"});
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if (!mmsp.getMap().containsKey("hl.simple.post")) mmsp.getMap().put("hl.simple.post", new String[]{"</b>"});
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if (!mmsp.getMap().containsKey("hl.fragsize")) mmsp.getMap().put("hl.fragsize", new String[]{Integer.toString(SearchEvent.SNIPPET_MAX_LENGTH)});
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if (!mmsp.getMap().containsKey(CommonParams.FL)) mmsp.getMap().put(CommonParams.FL, new String[]{
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CollectionSchema.sku.getSolrFieldName() + "," +
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CollectionSchema.title.getSolrFieldName() + "," +
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CollectionSchema.description_txt.getSolrFieldName() + "," +
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CollectionSchema.id.getSolrFieldName() + "," +
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CollectionSchema.author.getSolrFieldName() + "," +
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CollectionSchema.publisher_t.getSolrFieldName() + "," +
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CollectionSchema.keywords.getSolrFieldName() + "," +
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CollectionSchema.url_paths_sxt.getSolrFieldName() + "," +
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CollectionSchema.last_modified.getSolrFieldName() + "," +
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CollectionSchema.size_i.getSolrFieldName() + "," +
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CollectionSchema.url_protocol_s.getSolrFieldName() + "," +
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CollectionSchema.url_file_ext_s.getSolrFieldName()});
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}
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// get the embedded connector
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final String requestURI = hrequest.getRequestURI();
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boolean defaultConnector = (requestURI.startsWith("/solr/" + WebgraphSchema.CORE_NAME)) ? false : requestURI.startsWith("/solr/" + CollectionSchema.CORE_NAME) || mmsp.get("core", CollectionSchema.CORE_NAME).equals(CollectionSchema.CORE_NAME);
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mmsp.getMap().remove("core");
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SolrConnector connector = defaultConnector ? sb.index.fulltext().getDefaultEmbeddedConnector() : sb.index.fulltext().getEmbeddedConnector(WebgraphSchema.CORE_NAME);
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if (connector == null) {
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connector = defaultConnector ? sb.index.fulltext().getDefaultConnector() : sb.index.fulltext().getConnectorForRead(WebgraphSchema.CORE_NAME);
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}
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if (connector == null) throw new ServletException("no core");
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// add default queryfield parameter according to local ranking config (or defaultfield)
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if (multiDoc) {
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if (ranking != null) { // ranking normally never null
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final String qf = ranking.getQueryFields();
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if (qf.length() > 4 && !mmsp.getMap().containsKey(DisMaxParams.QF)) { // make sure qf has content (else use df)
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MultiMapSolrParams.addParam(DisMaxParams.QF, qf, mmsp.getMap()); // add QF that we set to be best suited for our index
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// TODO: if every peer applies a decent QF itself, this can be reverted to getMap().put()
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} else if(!mmsp.getMap().containsKey(CommonParams.DF)) {
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mmsp.getMap().put(CommonParams.DF, new String[]{CollectionSchema.text_t.getSolrFieldName()});
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}
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} else if(!mmsp.getMap().containsKey(CommonParams.DF)) {
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mmsp.getMap().put(CommonParams.DF, new String[]{CollectionSchema.text_t.getSolrFieldName()});
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}
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}
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// do the solr request, generate facets if we use a special YaCy format
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final SolrQueryResponse rsp;
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if (connector instanceof EmbeddedSolrConnector) {
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req = ((EmbeddedSolrConnector) connector).request(mmsp);
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/* Add the servlet request URI to the context for eventual computation of relative paths in writers */
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req.getContext().put("requestURI", requestURI);
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rsp = ((EmbeddedSolrConnector) connector).query(req);
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// prepare response
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hresponse.setHeader("Cache-Control", "no-cache, no-store");
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HttpCacheHeaderUtil.checkHttpCachingVeto(rsp, hresponse, reqMethod);
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// check error
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if (rsp.getException() != null) {
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AccessTracker.addToDump(querystring, 0, new Date(), "sq");
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sendError(hresponse, rsp.getException());
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return;
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}
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final Object responseObj = rsp.getResponse();
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if(responseObj instanceof ResultContext) {
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/* Regular response object */
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final DocList r = ((ResultContext) responseObj).getDocList();
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AccessTracker.addToDump(querystring, r.matches(), new Date(), "sq");
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} else if(responseObj instanceof SolrDocumentList){
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/*
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* The response object can be a SolrDocumentList when the response is partial,
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* for example when the allowed processing time has been exceeded
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*/
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final SolrDocumentList r = (SolrDocumentList) responseObj;
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AccessTracker.addToDump(querystring, r.getNumFound(), new Date(), "sq");
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}
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// write response header
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final String contentType = responseWriter.getContentType(req, rsp);
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if (null != contentType) response.setContentType(contentType);
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if (Method.HEAD == reqMethod) {
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return;
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}
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// write response body
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if (responseWriter instanceof BinaryResponseWriter) {
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((BinaryResponseWriter) responseWriter).write(response.getOutputStream(), req, rsp);
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} else {
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OutputStreamWriter osw = new OutputStreamWriter(response.getOutputStream(), StandardCharsets.UTF_8);
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responseWriter.write(osw, req, rsp);
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osw.close();
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}
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} else {
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if (responseWriter instanceof EmbeddedSolrResponseWriter || responseWriter instanceof CSVResponseWriter
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|| responseWriter instanceof XSLTResponseWriter || responseWriter instanceof RawResponseWriter) {
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/* These writers need a non null req.getSearcher(), req.getSchema() and/or req.getCore() */
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throw new ServletException("The writer " + responseWriter.getClass().getSimpleName() + " can only process responses from an embedded Solr server.");
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}
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QueryResponse queryRsp = connector.getResponseByParams(ModifiableSolrParams.of(mmsp));
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/* Create SolrQueryRequestBase and SolrQueryResponse instances as these types are requited by Solr standard writers.
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* WARNING : the SolrQueryRequestBase instance will return null for the getSearcher(), getCore() and getSchema() functions.
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* Be sure thath the responseWriter instance can handle this properly. */
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req = new SolrQueryRequestBase(null, mmsp) {};
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/* Add the servlet request URI to the context for eventual computation of relative paths in writers */
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req.getContext().put("requestURI", requestURI);
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rsp = new SolrQueryResponse();
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rsp.setHttpCaching(false);
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rsp.setAllValues(queryRsp.getResponse());
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if(!mmsp.getBool(CommonParams.OMIT_HEADER, false)) {
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NamedList<Object> responseHeader = rsp.getResponseHeader();
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if (responseHeader == null) {
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/* The remote Solr provided no response header ? Not likely to happen but let's add one */
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responseHeader = new SimpleOrderedMap<Object>();
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responseHeader.add("params", mmsp.toNamedList());
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rsp.addResponseHeader(responseHeader);
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} else {
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final int paramsIndex = responseHeader.indexOf("params", 0);
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if (paramsIndex >= 0) {
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/* Write this Solr servlet initial params to the response header and not the params sent to the remote Solr that differ a little (notably the wt param) */
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responseHeader.setVal(paramsIndex, mmsp.toNamedList());
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} else {
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responseHeader.add("params", mmsp.toNamedList());
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}
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}
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}
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// prepare response
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hresponse.setHeader("Cache-Control", "no-cache, no-store");
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final SolrDocumentList documentsList = queryRsp.getResults();
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long numFound = documentsList.getNumFound();
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AccessTracker.addToDump(querystring, numFound, new Date(), "sq");
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// write response header
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final String contentType = responseWriter.getContentType(req, rsp);
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if (null != contentType) {
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response.setContentType(contentType);
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}
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if (Method.HEAD == reqMethod) {
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return;
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}
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// write response body
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if (responseWriter instanceof SolrjResponseWriter) {
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out = new OutputStreamWriter(response.getOutputStream(), StandardCharsets.UTF_8);
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((SolrjResponseWriter) responseWriter).write(out, req,
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defaultConnector ? CollectionSchema.CORE_NAME : WebgraphSchema.CORE_NAME, queryRsp);
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} else if(responseWriter instanceof BinaryResponseWriter) {
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((BinaryResponseWriter) responseWriter).write(response.getOutputStream(), req, rsp);
|
|
} else {
|
|
OutputStreamWriter osw = new OutputStreamWriter(response.getOutputStream(), StandardCharsets.UTF_8);
|
|
responseWriter.write(osw, req, rsp);
|
|
osw.close();
|
|
}
|
|
}
|
|
} catch (final Throwable ex) {
|
|
sendError(hresponse, ex);
|
|
} finally {
|
|
if (req != null) {
|
|
req.close();
|
|
}
|
|
if (out != null) {
|
|
try {
|
|
out.close();
|
|
} catch (final IOException e1) {
|
|
ConcurrentLog.info("SolrSelect", "Could not close output writer."
|
|
+ (e1.getMessage() != null ? "Cause : " + e1.getMessage() : ""));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
private void sendError(HttpServletResponse hresponse, Throwable ex) throws IOException {
|
|
int code = (ex instanceof SolrException) ? ((SolrException) ex).code() : 500;
|
|
StringWriter sw = new StringWriter();
|
|
ex.printStackTrace(new PrintWriter(sw));
|
|
hresponse.sendError((code < 100) ? 500 : code, ex.getMessage() + "\n\n" + sw.toString());
|
|
}
|
|
|
|
}
|