| /** |
| * 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.tajo.cli.tsql.commands; |
| |
| import org.apache.tajo.cli.tsql.TajoCli; |
| |
| import java.io.*; |
| import java.util.concurrent.CountDownLatch; |
| |
| public class ExecExternalShellCommand extends TajoShellCommand { |
| public ExecExternalShellCommand(TajoCli.TajoCliContext context) { |
| super(context); |
| } |
| |
| @Override |
| public String getCommand() { |
| return "\\!"; |
| } |
| |
| @Override |
| public void invoke(String[] command) throws Exception { |
| StringBuilder shellCommand = new StringBuilder(); |
| String prefix = ""; |
| for(int i = 1; i < command.length; i++) { |
| shellCommand.append(prefix).append(command[i]); |
| prefix = " "; |
| } |
| |
| String builtCommand = shellCommand.toString(); |
| if (command.length < 2) { |
| throw new IOException("ERROR: '" + builtCommand + "' is an invalid command."); |
| } |
| |
| String[] execCommand = new String[3]; |
| execCommand[0] = "/bin/bash"; |
| execCommand[1] = "-c"; |
| execCommand[2] = builtCommand; |
| |
| PrintWriter sout = context.getOutput(); |
| PrintWriter serr = context.getError(); |
| |
| CountDownLatch latch = new CountDownLatch(2); |
| Process process = Runtime.getRuntime().exec(execCommand); |
| try { |
| InputStreamConsoleWriter inWriter = new InputStreamConsoleWriter(process.getInputStream(), sout, "", latch); |
| InputStreamConsoleWriter errWriter = new InputStreamConsoleWriter(process.getErrorStream(), serr, "ERROR: ", latch); |
| |
| inWriter.start(); |
| errWriter.start(); |
| |
| int processResult = process.waitFor(); |
| latch.await(); |
| if (processResult != 0) { |
| throw new IOException("ERROR: Failed with exit code = " + processResult); |
| } |
| } finally { |
| org.apache.commons.io.IOUtils.closeQuietly(process.getInputStream()); |
| org.apache.commons.io.IOUtils.closeQuietly(process.getOutputStream()); |
| org.apache.commons.io.IOUtils.closeQuietly(process.getErrorStream()); |
| } |
| } |
| |
| @Override |
| public String getUsage() { |
| return "<command> [params]"; |
| } |
| |
| @Override |
| public String getDescription() { |
| return "executes external shell command in TAJO shell"; |
| } |
| |
| static class InputStreamConsoleWriter extends Thread { |
| private InputStream in; |
| private PrintWriter writer; |
| private String prefix; |
| private CountDownLatch latch; |
| |
| public InputStreamConsoleWriter(InputStream in, PrintWriter writer, String prefix, CountDownLatch latch) { |
| this.in = in; |
| this.writer = writer; |
| this.prefix = prefix; |
| this.latch = latch; |
| } |
| |
| @Override |
| public void run() { |
| BufferedReader reader = null; |
| try { |
| reader = new BufferedReader(new InputStreamReader(in)); |
| String line; |
| while ((line = reader.readLine()) != null) { |
| writer.println(prefix + line); |
| writer.flush(); |
| } |
| } catch (Exception e) { |
| writer.println("ERROR: " + e.getMessage()); |
| } finally { |
| if (reader != null) { |
| try { |
| reader.close(); |
| } catch (IOException e) { |
| } |
| } |
| latch.countDown(); |
| } |
| } |
| } |
| } |