| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF 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 com.cloud.hypervisor.kvm.resource; |
| |
| import groovy.lang.Binding; |
| import groovy.lang.GroovyObject; |
| import groovy.util.GroovyScriptEngine; |
| import groovy.util.ResourceException; |
| import groovy.util.ScriptException; |
| import org.apache.logging.log4j.Logger; |
| import org.apache.logging.log4j.LogManager; |
| import org.codehaus.groovy.runtime.metaclass.MissingMethodExceptionNoStack; |
| |
| import java.io.File; |
| import java.io.IOException; |
| |
| public class LibvirtKvmAgentHook { |
| private final String script; |
| private final String method; |
| private final GroovyScriptEngine gse; |
| private final Binding binding = new Binding(); |
| |
| protected Logger logger = LogManager.getLogger(getClass()); |
| |
| public LibvirtKvmAgentHook(String path, String script, String method) throws IOException { |
| this.script = script; |
| this.method = method; |
| File full_path = new File(path, script); |
| if (!full_path.canRead()) { |
| logger.warn("Groovy script '" + full_path.toString() + "' is not available. Transformations will not be applied."); |
| this.gse = null; |
| } else { |
| this.gse = new GroovyScriptEngine(path); |
| } |
| } |
| |
| public boolean isInitialized() { |
| return this.gse != null; |
| } |
| |
| public Object handle(Object arg) throws ResourceException, ScriptException { |
| if (!isInitialized()) { |
| logger.warn("Groovy scripting engine is not initialized. Data transformation skipped."); |
| return arg; |
| } |
| |
| GroovyObject cls = (GroovyObject) this.gse.run(this.script, binding); |
| if (null == cls) { |
| logger.warn("Groovy object is not received from script '" + this.script + "'."); |
| return arg; |
| } else { |
| Object[] params = {logger, arg}; |
| try { |
| Object res = cls.invokeMethod(this.method, params); |
| return res; |
| } catch (MissingMethodExceptionNoStack e) { |
| logger.error("Error occurred when calling method from groovy script, {}", e); |
| return arg; |
| } |
| } |
| } |
| } |