| /* |
| * 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.nifi.registry.security.authorization.shell; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.io.Reader; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.ExecutorService; |
| import java.util.concurrent.Executors; |
| import java.util.concurrent.ThreadFactory; |
| import java.util.concurrent.TimeUnit; |
| |
| public class ShellRunner { |
| private final static Logger logger = LoggerFactory.getLogger(ShellRunner.class); |
| |
| static String SHELL = "sh"; |
| static String OPTS = "-c"; |
| |
| private final int timeoutSeconds; |
| private final ExecutorService executor; |
| |
| public ShellRunner(final int timeoutSeconds) { |
| this.timeoutSeconds = timeoutSeconds; |
| this.executor = Executors.newFixedThreadPool(1, new ThreadFactory() { |
| @Override |
| public Thread newThread(final Runnable r) { |
| final Thread t = Executors.defaultThreadFactory().newThread(r); |
| t.setName("ShellRunner"); |
| t.setDaemon(true); |
| return t; |
| } |
| }); |
| } |
| |
| public List<String> runShell(String command) throws IOException { |
| return runShell(command, "<unknown>"); |
| } |
| |
| public List<String> runShell(String command, String description) throws IOException { |
| final ProcessBuilder builder = new ProcessBuilder(SHELL, OPTS, command); |
| builder.redirectErrorStream(true); |
| |
| final List<String> builderCommand = builder.command(); |
| logger.debug("Run Command '{}': {}", new Object[]{description, builderCommand}); |
| |
| final Process proc = builder.start(); |
| |
| final List<String> lines = new ArrayList<>(); |
| executor.submit(() -> { |
| try { |
| try (final Reader stdin = new InputStreamReader(proc.getInputStream()); |
| final BufferedReader reader = new BufferedReader(stdin)) { |
| logger.trace("Reading process input stream..."); |
| |
| String line; |
| int lineCount = 0; |
| while ((line = reader.readLine()) != null) { |
| if (logger.isTraceEnabled()) { |
| logger.trace((++lineCount) + " - " + line); |
| } |
| lines.add(line.trim()); |
| } |
| |
| logger.trace("Finished reading process input stream"); |
| } |
| } catch (IOException e) { |
| logger.error(e.getMessage(), e); |
| } |
| }); |
| |
| boolean completed; |
| try { |
| completed = proc.waitFor(timeoutSeconds, TimeUnit.SECONDS); |
| } catch (InterruptedException irexc) { |
| throw new IOException(irexc.getMessage(), irexc.getCause()); |
| } |
| |
| if (!completed) { |
| logger.debug("Process did not complete in allotted time, attempting to forcibly destroy process..."); |
| try { |
| proc.destroyForcibly(); |
| } catch (Exception e) { |
| logger.debug("Process failed to destroy: " + e.getMessage(), e); |
| } |
| throw new IllegalStateException("Shell command '" + command + "' did not complete during the allotted time period"); |
| } |
| |
| if (proc.exitValue() != 0) { |
| throw new IOException("Process exited with non-zero value: " + proc.exitValue()); |
| } |
| |
| return lines; |
| } |
| |
| public void shutdown() { |
| executor.shutdown(); |
| try { |
| if (!executor.awaitTermination(5000L, TimeUnit.MILLISECONDS)) { |
| logger.info("Failed to stop ShellRunner executor in 5 seconds. Terminating"); |
| executor.shutdownNow(); |
| } |
| } catch (InterruptedException ie) { |
| executor.shutdownNow(); |
| Thread.currentThread().interrupt(); |
| } |
| } |
| } |