/**
* 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 org.apache.ambari.server.api.services.stackadvisor;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.ambari.server.api.services.stackadvisor.commands.StackAdvisorCommandType;
import org.apache.commons.io.FileUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.inject.Singleton;
@Singleton
public class StackAdvisorRunner {
private final static Logger LOG = LoggerFactory.getLogger(StackAdvisorRunner.class);
/**
* Runs stack_advisor.py script in the specified {@code actionDirectory}.
*
* @param script stack advisor script
* @param saCommandType {@link StackAdvisorCommandType} to run.
* @param actionDirectory directory for the action
*/
public void runScript(String script, StackAdvisorCommandType saCommandType, File actionDirectory)
throws StackAdvisorException {
LOG.info(String.format("Script=%s, actionDirectory=%s, command=%s", script, actionDirectory,
saCommandType));
String outputFile = actionDirectory + File.separator + "stackadvisor.out";
String errorFile = actionDirectory + File.separator + "stackadvisor.err";
ProcessBuilder builder = prepareShellCommand(script, saCommandType,
actionDirectory, outputFile,
errorFile);
try {
Process process = builder.start();
try {
LOG.info("Stack-advisor output={}, error={}", outputFile, errorFile);
int exitCode = process.waitFor();
String outMessage;
String errMessage = null;
try {
outMessage = FileUtils.readFileToString(new File(outputFile)).trim();
errMessage = FileUtils.readFileToString(new File(errorFile)).trim();
LOG.info("Stack advisor output files");
LOG.info(" advisor script stdout: {}", outMessage);
LOG.info(" advisor script stderr: {}", errMessage);
} catch (IOException io) {
LOG.error("Error in reading script log files", io);
}
if (exitCode > 0) {
String errorMessage;
if (errMessage != null) {
// We want to get the last line.
int index = errMessage.lastIndexOf("\n");
if (index > 0 && index == (errMessage.length() - 1)) {
index = errMessage.lastIndexOf("\n", index - 1); // sentence ended with newline
}
if (index > -1) {
errMessage = errMessage.substring(index + 1).trim();
}
errorMessage = "Stack Advisor reported an error: " + errMessage;
} else {
errorMessage = "Error occurred during stack advisor execution";
}
errorMessage += "\nStdOut file: " + outputFile + "\n";
errorMessage += "\nStdErr file: " + errorFile;
switch (exitCode) {
case 1:
throw new StackAdvisorRequestException(errorMessage);
case 2:
throw new StackAdvisorException(errorMessage);
}
}
} finally {
process.destroy();
}
} catch (StackAdvisorException ex) {
throw ex;
} catch (Exception ioe) {
String message = "Error executing stack advisor: ";
LOG.error(message, ioe);
throw new StackAdvisorException(message + ioe.getMessage());
}
}
/**
* Gets an instance of a {@link ProcessBuilder} that's ready to execute the
* shell command to run the stack advisor script. This will take the
* environment variables from the current process.
*
* @param script
* @param saCommandType
* @param actionDirectory
* @param outputFile
* @param errorFile
* @return
*/
ProcessBuilder prepareShellCommand(String script,
StackAdvisorCommandType saCommandType,
File actionDirectory, String outputFile, String errorFile) {
String hostsFile = actionDirectory + File.separator + "hosts.json";
String servicesFile = actionDirectory + File.separator + "services.json";
// includes the original command plus the arguments for it
List<String> builderParameters = new ArrayList<>();
if (System.getProperty("os.name").contains("Windows")) {
builderParameters.add("cmd");
builderParameters.add("/c");
} else {
builderParameters.add("sh");
builderParameters.add("-c");
}
// for the 3rd argument, build a single parameter since we use -c
// ProcessBuilder doesn't support output redirection until JDK 1.7
String commandStringParameters[] = new String[] { script,
saCommandType.toString(), hostsFile,
servicesFile, "1>", outputFile, "2>", errorFile };
StringBuilder commandString = new StringBuilder();
for (String command : commandStringParameters) {
commandString.append(command).append(" ");
}
builderParameters.add(commandString.toString());
LOG.debug("Stack advisor command is {}", builderParameters);
return new ProcessBuilder(builderParameters);
}
}