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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.ingest.common;
import org.elasticsearch.common.Strings;
import org.elasticsearch.ingest.AbstractProcessor;
import org.elasticsearch.ingest.IngestDocument;
import org.elasticsearch.ingest.Processor;
import org.elasticsearch.script.ExecutableScript;
import org.elasticsearch.script.Script;
import org.elasticsearch.script.ScriptContext;
import org.elasticsearch.script.ScriptException;
import org.elasticsearch.script.ScriptService;
import java.util.Map;
import static java.util.Collections.emptyMap;
import static org.elasticsearch.common.Strings.hasLength;
import static org.elasticsearch.ingest.ConfigurationUtils.newConfigurationException;
import static org.elasticsearch.ingest.ConfigurationUtils.readOptionalMap;
import static org.elasticsearch.ingest.ConfigurationUtils.readOptionalStringProperty;
import static org.elasticsearch.script.ScriptType.INLINE;
import static org.elasticsearch.script.ScriptType.STORED;
/**
* Processor that evaluates a script with an ingest document in its context.
*/
public final class ScriptProcessor extends AbstractProcessor {
public static final String TYPE = "script";
private final Script script;
private final ScriptService scriptService;
/**
* Processor that evaluates a script with an ingest document in its context
*
* @param tag The processor's tag.
* @param script The {@link Script} to execute.
* @param scriptService The {@link ScriptService} used to execute the script.
*/
ScriptProcessor(String tag, Script script, ScriptService scriptService) {
super(tag);
this.script = script;
this.scriptService = scriptService;
}
/**
* Executes the script with the Ingest document in context.
*
* @param document The Ingest document passed into the script context under the "ctx" object.
*/
@Override
public void execute(IngestDocument document) {
ExecutableScript.Compiled compiledScript = scriptService.compile(script, ScriptContext.INGEST);
ExecutableScript executableScript = compiledScript.newInstance(script.getParams());
executableScript.setNextVar("ctx", document.getSourceAndMetadata());
executableScript.run();
}
@Override
public String getType() {
return TYPE;
}
Script getScript() {
return script;
}
public static final class Factory implements Processor.Factory {
private final ScriptService scriptService;
public Factory(ScriptService scriptService) {
this.scriptService = scriptService;
}
@Override
@SuppressWarnings("unchecked")
public ScriptProcessor create(Map<String, Processor.Factory> registry, String processorTag,
Map<String, Object> config) throws Exception {
String lang = readOptionalStringProperty(TYPE, processorTag, config, "lang");
String inline = readOptionalStringProperty(TYPE, processorTag, config, "inline");
String id = readOptionalStringProperty(TYPE, processorTag, config, "id");
Map<String, ?> params = readOptionalMap(TYPE, processorTag, config, "params");
boolean containsNoScript = !hasLength(id) && !hasLength(inline);
if (containsNoScript) {
throw newConfigurationException(TYPE, processorTag, null, "Need [id] or [inline] parameter to refer to scripts");
}
boolean moreThanOneConfigured = Strings.hasLength(id) && Strings.hasLength(inline);
if (moreThanOneConfigured) {
throw newConfigurationException(TYPE, processorTag, null, "Only one of [id] or [inline] may be configured");
}
if (lang == null) {
lang = Script.DEFAULT_SCRIPT_LANG;
}
if (params == null) {
params = emptyMap();
}
final Script script;
String scriptPropertyUsed;
if (Strings.hasLength(inline)) {
script = new Script(INLINE, lang, inline, (Map<String, Object>)params);
scriptPropertyUsed = "inline";
} else if (Strings.hasLength(id)) {
script = new Script(STORED, lang, id, (Map<String, Object>)params);
scriptPropertyUsed = "id";
} else {
throw newConfigurationException(TYPE, processorTag, null, "Could not initialize script");
}
// verify script is able to be compiled before successfully creating processor.
try {
scriptService.compile(script, ScriptContext.INGEST);
} catch (ScriptException e) {
throw newConfigurationException(TYPE, processorTag, scriptPropertyUsed, e);
}
return new ScriptProcessor(processorTag, script, scriptService);
}
}
}
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