| /* |
| * Copyright 2018 The Bazel Authors. All rights reserved. |
| * |
| * Licensed 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 io.bazel.ruleskotlin.workers.utils; |
| |
| import java.io.*; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.TimeoutException; |
| |
| public final class IOUtils { |
| // sort this one out |
| public static List<String> executeAndWaitOutput(int timeoutSeconds, String... command) { |
| try { |
| ProcessBuilder builder = new ProcessBuilder(command).redirectError(ProcessBuilder.Redirect.INHERIT); |
| Process process = builder.start(); |
| ArrayList<String> al = new ArrayList<>(); |
| CompletableFuture<Void> streamReader = null; |
| try (BufferedReader output = new BufferedReader(new InputStreamReader(process.getInputStream()))) { |
| streamReader = CompletableFuture.runAsync(() -> { |
| while (true) { |
| try { |
| String line = output.readLine(); |
| if (line == null) |
| break; |
| al.add(line); |
| } catch (IOException e) { |
| throw new UncheckedIOException(e); |
| } |
| } |
| }); |
| executeAwait(timeoutSeconds, process); |
| return al; |
| } finally { |
| if (streamReader != null && !streamReader.isDone()) { |
| streamReader.cancel(true); |
| } |
| } |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| private static int executeAwait(int timeoutSeconds, Process process) throws TimeoutException { |
| try { |
| if (!process.waitFor(timeoutSeconds, TimeUnit.SECONDS)) { |
| throw new TimeoutException(); |
| } |
| return process.exitValue(); |
| } catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } finally { |
| if (process.isAlive()) { |
| process.destroy(); |
| } |
| } |
| } |
| |
| public static int executeAndAwait(int timeoutSeconds, List<String> args) { |
| BufferedReader is = null; |
| BufferedReader es = null; |
| try { |
| ProcessBuilder builder = new ProcessBuilder(args.toArray(new String[args.size()])); |
| builder.redirectInput(ProcessBuilder.Redirect.PIPE); |
| builder.redirectError(ProcessBuilder.Redirect.PIPE); |
| Process process = builder.start(); |
| is = new BufferedReader(new InputStreamReader(process.getInputStream())); |
| es = new BufferedReader(new InputStreamReader(process.getErrorStream())); |
| return executeAwait(timeoutSeconds, process); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } finally { |
| drainStreamTo(System.out, is); |
| drainStreamTo(System.err, es); |
| } |
| } |
| |
| private static void drainStreamTo(PrintStream writer, BufferedReader reader) { |
| if (reader != null) { |
| reader.lines().forEach(writer::println); |
| try { |
| reader.close(); |
| } catch (IOException e) { |
| throw new UncheckedIOException(e); |
| } |
| } |
| } |
| |
| public static void executeAndAwaitSuccess(int timeoutSeconds, List<String> command) { |
| int status = executeAndAwait(timeoutSeconds, command); |
| if (status != 0) { |
| throw new RuntimeException("process failed with status: " + status); |
| } |
| } |
| |
| |
| public static void purgeDirectory(Path directory) throws IOException { |
| File directoryAsFile = directory.toFile(); |
| Files.walk(directory) |
| .map(Path::toFile) |
| .sorted((o1, o2) -> -o1.compareTo(o2)) |
| .filter(file -> !directoryAsFile.equals(file)) // nasty |
| .forEach(file -> { |
| assert !file.delete(); |
| }); |
| } |
| |
| public static Throwable getRootCause(Throwable e) { |
| Throwable cause; |
| Throwable result = e; |
| |
| while (null != (cause = result.getCause()) && (result != cause)) { |
| result = cause; |
| } |
| return result; |
| } |
| } |