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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.script.python;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.search.Scorer;
import org.elasticsearch.common.Nullable;
import org.elasticsearch.common.component.AbstractComponent;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.script.*;
import org.elasticsearch.search.lookup.SearchLookup;
import org.python.core.Py;
import org.python.core.PyCode;
import org.python.core.PyObject;
import org.python.core.PyStringMap;
import org.python.util.PythonInterpreter;
import java.util.Map;
/**
*
*/
//TODO we can optimize the case for Map<String, Object> similar to PyStringMap
public class PythonScriptEngineService extends AbstractComponent implements ScriptEngineService {
private final PythonInterpreter interp;
@Inject
public PythonScriptEngineService(Settings settings) {
super(settings);
this.interp = PythonInterpreter.threadLocalStateInterpreter(null);
}
@Override
public String[] types() {
return new String[]{"python", "py"};
}
@Override
public String[] extensions() {
return new String[]{"py"};
}
@Override
public boolean sandboxed() {
return false;
}
@Override
public Object compile(String script) {
return interp.compile(script);
}
@Override
public ExecutableScript executable(Object compiledScript, Map<String, Object> vars) {
return new PythonExecutableScript((PyCode) compiledScript, vars);
}
@Override
public SearchScript search(Object compiledScript, SearchLookup lookup, @Nullable Map<String, Object> vars) {
return new PythonSearchScript((PyCode) compiledScript, vars, lookup);
}
@Override
public Object execute(Object compiledScript, Map<String, Object> vars) {
PyObject pyVars = Py.java2py(vars);
interp.setLocals(pyVars);
PyObject ret = interp.eval((PyCode) compiledScript);
if (ret == null) {
return null;
}
return ret.__tojava__(Object.class);
}
@Override
public Object unwrap(Object value) {
return unwrapValue(value);
}
@Override
public void close() {
interp.cleanup();
}
@Override
public void scriptRemoved(@Nullable CompiledScript compiledScript) {
// Nothing to do
}
public class PythonExecutableScript implements ExecutableScript {
private final PyCode code;
private final PyStringMap pyVars;
public PythonExecutableScript(PyCode code, Map<String, Object> vars) {
this.code = code;
this.pyVars = new PyStringMap();
if (vars != null) {
for (Map.Entry<String, Object> entry : vars.entrySet()) {
pyVars.__setitem__(entry.getKey(), Py.java2py(entry.getValue()));
}
}
}
@Override
public void setNextVar(String name, Object value) {
pyVars.__setitem__(name, Py.java2py(value));
}
@Override
public Object run() {
interp.setLocals(pyVars);
PyObject ret = interp.eval(code);
if (ret == null) {
return null;
}
return ret.__tojava__(Object.class);
}
@Override
public Object unwrap(Object value) {
return unwrapValue(value);
}
}
public class PythonSearchScript implements SearchScript {
private final PyCode code;
private final PyStringMap pyVars;
private final SearchLookup lookup;
public PythonSearchScript(PyCode code, Map<String, Object> vars, SearchLookup lookup) {
this.code = code;
this.pyVars = new PyStringMap();
for (Map.Entry<String, Object> entry : lookup.asMap().entrySet()) {
pyVars.__setitem__(entry.getKey(), Py.java2py(entry.getValue()));
}
if (vars != null) {
for (Map.Entry<String, Object> entry : vars.entrySet()) {
pyVars.__setitem__(entry.getKey(), Py.java2py(entry.getValue()));
}
}
this.lookup = lookup;
}
@Override
public void setScorer(Scorer scorer) {
pyVars.__setitem__("_score", Py.java2py(new ScoreAccessor(scorer)));
}
@Override
public void setNextReader(LeafReaderContext context) {
lookup.setNextReader(context);
}
@Override
public void setNextDocId(int doc) {
lookup.setNextDocId(doc);
}
@Override
public void setNextSource(Map<String, Object> source) {
lookup.source().setNextSource(source);
}
@Override
public void setNextVar(String name, Object value) {
pyVars.__setitem__(name, Py.java2py(value));
}
@Override
public Object run() {
interp.setLocals(pyVars);
PyObject ret = interp.eval(code);
if (ret == null) {
return null;
}
return ret.__tojava__(Object.class);
}
@Override
public float runAsFloat() {
return ((Number) run()).floatValue();
}
@Override
public long runAsLong() {
return ((Number) run()).longValue();
}
@Override
public double runAsDouble() {
return ((Number) run()).doubleValue();
}
@Override
public Object unwrap(Object value) {
return unwrapValue(value);
}
}
public static Object unwrapValue(Object value) {
if (value == null) {
return null;
} else if (value instanceof PyObject) {
// seems like this is enough, inner PyDictionary will do the conversion for us for example, so expose it directly
return ((PyObject) value).__tojava__(Object.class);
}
return value;
}
}