307 lines
11 KiB
Java
307 lines
11 KiB
Java
/*
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* Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.io.File;
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import java.io.FileReader;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.io.Reader;
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import java.io.Writer;
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import java.util.Arrays;
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import java.util.List;
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/*
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* @test PipelineTest
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* @bug 8211844
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* @summary Tests for ProcessBuilder.startPipeline
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*/
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public class PipelineTest {
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private static void realMain(String[] args) throws Throwable {
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t1_simplePipeline();
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t2_translatePipeline();
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t3_redirectErrorStream();
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t4_failStartPipeline();
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}
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/**
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* Return a list of the varargs arguments.
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* @param args elements to include in the list
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* @param <T> the type of the elements
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* @return a {@code List<T>} of the arguments
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*/
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@SafeVarargs
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@SuppressWarnings("varargs")
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static <T> List<T> asList(T... args) {
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return Arrays.asList(args);
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}
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/**
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* T1 - simple copy between two processes
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*/
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static void t1_simplePipeline() {
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try {
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String s1 = "Now is the time to check!";
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verify(s1, s1,
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asList(new ProcessBuilder("cat")));
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verify(s1, s1,
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asList(new ProcessBuilder("cat"),
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new ProcessBuilder("cat")));
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verify(s1, s1,
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asList(new ProcessBuilder("cat"),
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new ProcessBuilder("cat"),
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new ProcessBuilder("cat")));
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} catch (Throwable t) {
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unexpected(t);
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}
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}
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/**
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* Pipeline that modifies the content.
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*/
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static void t2_translatePipeline() {
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try {
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String s2 = "Now is the time to check!";
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String r2 = s2.replace('e', 'E').replace('o', 'O');
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verify(s2, r2,
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asList(new ProcessBuilder("tr", "e", "E"),
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new ProcessBuilder("tr", "o", "O")));
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} catch (Throwable t) {
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unexpected(t);
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}
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}
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/**
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* Test that redirectErrorStream sends standard error of the first process
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* to the standard output. The standard error of the first process should be empty.
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* The standard output of the 2nd should contain the error message including the bad file name.
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*/
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static void t3_redirectErrorStream() {
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try {
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File p1err = new File("p1-test.err");
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File p2out = new File("p2-test.out");
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List<Process> processes = ProcessBuilder.startPipeline(
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asList(new ProcessBuilder("cat", "NON-EXISTENT-FILE")
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.redirectErrorStream(true)
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.redirectError(p1err),
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new ProcessBuilder("cat").redirectOutput(p2out)));
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waitForAll(processes);
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check("".equals(fileContents(p1err)), "The first process standard error should be empty");
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String p2contents = fileContents(p2out);
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check(p2contents.contains("NON-EXISTENT-FILE"),
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"The error from the first process should be in the output of the second: " + p2contents);
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} catch (Throwable t) {
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unexpected(t);
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}
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}
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/**
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* Test that no processes are left after a failed startPipeline.
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* Test illegal combinations of redirects.
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*/
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static void t4_failStartPipeline() {
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File p1err = new File("p1-test.err");
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File p2out = new File("p2-test.out");
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THROWS(IllegalArgumentException.class,
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() -> {
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// Test that output redirect != PIPE throws IAE
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List<Process> processes = ProcessBuilder.startPipeline(
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asList(new ProcessBuilder("cat", "NON-EXISTENT-FILE1")
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.redirectOutput(p1err),
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new ProcessBuilder("cat")));
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},
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() -> {
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// Test that input redirect != PIPE throws IAE
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List<Process> processes = ProcessBuilder.startPipeline(
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asList(new ProcessBuilder("cat", "NON-EXISTENT-FILE2"),
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new ProcessBuilder("cat").redirectInput(p2out)));
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}
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);
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THROWS(NullPointerException.class,
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() -> {
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List<Process> processes = ProcessBuilder.startPipeline(
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asList(new ProcessBuilder("cat", "a"), null));
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},
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() -> {
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List<Process> processes = ProcessBuilder.startPipeline(
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asList(null, new ProcessBuilder("cat", "b")));
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}
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);
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THROWS(IOException.class,
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() -> {
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List<Process> processes = ProcessBuilder.startPipeline(
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asList(new ProcessBuilder("cat", "c"),
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new ProcessBuilder("NON-EXISTENT-COMMAND")));
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});
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// Check no subprocess are left behind
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ProcessHandle.current().children().forEach(PipelineTest::print);
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ProcessHandle.current().children()
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.filter(p -> p.info().command().orElse("").contains("cat"))
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.forEach(p -> fail("process should have been destroyed: " + p));
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}
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static void verify(String input, String expected, List<ProcessBuilder> builders) throws IOException {
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File infile = new File("test.in");
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File outfile = new File("test.out");
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setFileContents(infile, input);
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for (int i = 0; i < builders.size(); i++) {
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ProcessBuilder b = builders.get(i);
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if (i == 0) {
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b.redirectInput(infile);
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}
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if (i == builders.size() - 1) {
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b.redirectOutput(outfile);
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}
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}
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List<Process> processes = ProcessBuilder.startPipeline(builders);
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verifyProcesses(processes);
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waitForAll(processes);
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String result = fileContents(outfile);
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check(result.equals(expected),
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"result not as expected: " + result + ", expected: " + expected);
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}
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/**
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* Wait for each of the processes to be done.
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*
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* @param processes the list of processes to check
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*/
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static void waitForAll(List<Process> processes) {
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processes.forEach(p -> {
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try {
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int status = p.waitFor();
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} catch (InterruptedException ie) {
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unexpected(ie);
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}
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});
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}
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static void print(ProcessBuilder pb) {
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if (pb != null) {
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System.out.printf(" pb: %s%n", pb);
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System.out.printf(" cmd: %s%n", pb.command());
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}
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}
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static void print(ProcessHandle p) {
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System.out.printf("process: pid: %d, info: %s%n",
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p.pid(), p.info());
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}
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// Check various aspects of the processes
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static void verifyProcesses(List<Process> processes) {
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for (int i = 0; i < processes.size(); i++) {
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Process p = processes.get(i);
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if (i != 0) {
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verifyNullStream(p.getOutputStream(), "getOutputStream");
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}
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if (i <= processes.size() - 1) {
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verifyNullStream(p.getInputStream(), "getInputStream");
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}
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if (i == processes.size() - 1) {
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verifyNullStream(p.getErrorStream(), "getErrorStream");
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}
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}
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}
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static void verifyNullStream(OutputStream s, String msg) {
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try {
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s.write(0xff);
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fail("Stream should have been a NullStream: " + msg);
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} catch (IOException ie) {
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// expected
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}
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}
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static void verifyNullStream(InputStream s, String msg) {
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try {
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int len = s.read();
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check(len == -1, "Stream should have been a NullStream: " + msg);
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} catch (IOException ie) {
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// expected
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}
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}
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static void setFileContents(File file, String contents) {
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try {
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Writer w = new FileWriter(file);
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w.write(contents);
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w.close();
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} catch (Throwable t) { unexpected(t); }
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}
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static String fileContents(File file) {
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try {
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Reader r = new FileReader(file);
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StringBuilder sb = new StringBuilder();
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char[] buffer = new char[1024];
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int n;
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while ((n = r.read(buffer)) != -1)
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sb.append(buffer,0,n);
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r.close();
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return new String(sb);
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} catch (Throwable t) { unexpected(t); return ""; }
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}
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//--------------------- Infrastructure ---------------------------
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static volatile int passed = 0, failed = 0;
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static void pass() {passed++;}
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static void fail() {failed++; new Exception("Stack trace").printStackTrace(System.out);}
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static void fail(String msg) {
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System.out.println(msg); failed++;
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new Exception("Stack trace: " + msg).printStackTrace(System.out);
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}
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static void unexpected(Throwable t) {failed++; t.printStackTrace(System.out);}
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static void check(boolean cond) {if (cond) pass(); else fail();}
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static void check(boolean cond, String m) {if (cond) pass(); else fail(m);}
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static void equal(Object x, Object y) {
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if (x == null ? y == null : x.equals(y)) pass();
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else fail(">'" + x + "'<" + " not equal to " + "'" + y + "'");
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}
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public static void main(String[] args) throws Throwable {
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try {realMain(args);} catch (Throwable t) {unexpected(t);}
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System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed);
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if (failed > 0) throw new AssertionError("Some tests failed");
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}
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interface Fun {void f() throws Throwable;}
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static void THROWS(Class<? extends Throwable> k, Fun... fs) {
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for (Fun f : fs)
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try { f.f(); fail("Expected " + k.getName() + " not thrown"); }
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catch (Throwable t) {
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if (k.isAssignableFrom(t.getClass())) pass();
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else unexpected(t);}
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}
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}
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