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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.yql;
import com.google.common.annotations.Beta;
import com.google.inject.Inject;
import com.yahoo.language.Linguistics;
import com.yahoo.language.simple.SimpleLinguistics;
import com.yahoo.search.Query;
import com.yahoo.search.Result;
import com.yahoo.search.Searcher;
import com.yahoo.processing.request.CompoundName;
import com.yahoo.search.grouping.GroupingRequest;
import com.yahoo.search.query.QueryTree;
import com.yahoo.search.query.parser.Parsable;
import com.yahoo.search.query.parser.ParserEnvironment;
import com.yahoo.search.query.parser.ParserFactory;
import com.yahoo.search.result.ErrorMessage;
import com.yahoo.search.searchchain.Execution;
import com.yahoo.search.searchchain.PhaseNames;
import com.yahoo.yolean.chain.After;
import com.yahoo.yolean.chain.Before;
import com.yahoo.yolean.chain.Provides;
import java.util.logging.Logger;
/**
* Minimal combinator for YQL+ syntax and heuristically parsed user queries.
*
* @author Steinar Knutsen
*/
@Beta
@Provides(MinimalQueryInserter.EXTERNAL_YQL)
@Before(PhaseNames.TRANSFORMED_QUERY)
@After("com.yahoo.prelude.statistics.StatisticsSearcher")
public class MinimalQueryInserter extends Searcher {
public static final String EXTERNAL_YQL = "ExternalYql";
public static final CompoundName YQL = new CompoundName("yql");
private static final CompoundName MAX_HITS = new CompoundName("maxHits");
private static final CompoundName MAX_OFFSET = new CompoundName("maxOffset");
private static Logger log = Logger.getLogger(MinimalQueryInserter.class.getName());
@Inject
public MinimalQueryInserter(Linguistics linguistics) {
// Warmup is needed to avoid a large 400ms init cost during first execution of yql code.
warmup(linguistics);
}
public MinimalQueryInserter() {
this(new SimpleLinguistics());
}
static boolean warmup() {
return warmup(new SimpleLinguistics());
}
private static boolean warmup(Linguistics linguistics) {
Query query = new Query("search/?yql=select%20*%20from%20sources%20where%20title%20contains%20'xyz';");
Result result = insertQuery(query, new ParserEnvironment().setLinguistics(linguistics));
if (result != null) {
log.warning("Warmup code trigger an error. Error = " + result.toString());
return false;
}
if ( ! "select * from sources where title contains \"xyz\";".equals(query.yqlRepresentation())) {
log.warning("Warmup code generated unexpected yql: " + query.yqlRepresentation());
return false;
}
return true;
}
private static Result insertQuery(Query query, ParserEnvironment env) {
YqlParser parser = (YqlParser) ParserFactory.newInstance(Query.Type.YQL, env);
parser.setQueryParser(false);
parser.setUserQuery(query);
QueryTree newTree;
try {
Parsable parsable = Parsable.fromQueryModel(query.getModel()).setQuery(query.properties().getString(YQL));
newTree = parser.parse(parsable);
} catch (RuntimeException e) {
return new Result(query, ErrorMessage.createInvalidQueryParameter("Could not instantiate query from YQL", e));
}
if (parser.getOffset() != null) {
int maxHits = query.properties().getInteger(MAX_HITS);
int maxOffset = query.properties().getInteger(MAX_OFFSET);
if (parser.getOffset() > maxOffset) {
return new Result(query, ErrorMessage.createInvalidQueryParameter("Requested offset " + parser.getOffset()
+ ", but the max offset allowed is " + maxOffset + "."));
}
if (parser.getHits() > maxHits) {
return new Result(query, ErrorMessage.createInvalidQueryParameter("Requested " + parser.getHits()
+ " hits returned, but max hits allowed is " + maxHits + "."));
}
}
query.getModel().getQueryTree().setRoot(newTree.getRoot());
query.getPresentation().getSummaryFields().addAll(parser.getYqlSummaryFields());
for (VespaGroupingStep step : parser.getGroupingSteps()) {
GroupingRequest.newInstance(query)
.setRootOperation(step.getOperation())
.continuations().addAll(step.continuations());
}
if (parser.getYqlSources().size() == 0) {
query.getModel().getSources().clear();
} else {
query.getModel().getSources().addAll(parser.getYqlSources());
}
if (parser.getOffset() != null) {
query.setOffset(parser.getOffset());
query.setHits(parser.getHits());
}
if (parser.getTimeout() != null) {
query.setTimeout(parser.getTimeout().longValue());
}
if (parser.getSorting() != null) {
query.getRanking().setSorting(parser.getSorting());
}
query.trace("YQL+ query parsed", true, 2);
return null;
}
@Override
public Result search(Query query, Execution execution) {
if (query.properties().get(YQL) == null) return execution.search(query);
Result result = insertQuery(query, ParserEnvironment.fromExecutionContext(execution.context()));
return (result == null) ? execution.search(query) : result;
}
}
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