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// Copyright 2014 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 com.google.devtools.build.lib.util.io;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import com.google.devtools.build.lib.util.StringUtilities;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import java.io.ByteArrayOutputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.Random;
/**
* Tests {@link StreamDemultiplexer}.
*/
@RunWith(JUnit4.class)
public class StreamDemultiplexerTest {
private ByteArrayOutputStream out = new ByteArrayOutputStream();
private ByteArrayOutputStream err = new ByteArrayOutputStream();
private ByteArrayOutputStream ctl = new ByteArrayOutputStream();
private byte[] lines(String... lines) {
try {
return StringUtilities.joinLines(lines).getBytes("ISO-8859-1");
} catch (UnsupportedEncodingException e) {
throw new AssertionError(e);
}
}
private String toAnsi(ByteArrayOutputStream stream) {
try {
return new String(stream.toByteArray(), "ISO-8859-1");
} catch (UnsupportedEncodingException e) {
throw new AssertionError(e);
}
}
private byte[] inAnsi(String string) {
try {
return string.getBytes("ISO-8859-1");
} catch (UnsupportedEncodingException e) {
throw new AssertionError(e);
}
}
@Test
public void testHelloWorldOnStandardOut() throws Exception {
byte[] multiplexed = lines("@1@", "Hello, world.");
try (final StreamDemultiplexer demux = new StreamDemultiplexer((byte) '1', out)) {
demux.write(multiplexed);
}
assertEquals("Hello, world.", out.toString("ISO-8859-1"));
}
@Test
public void testOutErrCtl() throws Exception {
byte[] multiplexed = lines("@1@", "out", "@2@", "err", "@3@", "ctl", "");
try (final StreamDemultiplexer demux = new StreamDemultiplexer((byte) '1', out, err, ctl)) {
demux.write(multiplexed);
}
assertEquals("out", toAnsi(out));
assertEquals("err", toAnsi(err));
assertEquals("ctl", toAnsi(ctl));
}
@Test
public void testWithoutLineBreaks() throws Exception {
byte[] multiplexed = lines("@1@", "just ", "@1@", "one ", "@1@", "line", "");
try (final StreamDemultiplexer demux = new StreamDemultiplexer((byte) '1', out)) {
demux.write(multiplexed);
}
assertEquals("just one line", out.toString("ISO-8859-1"));
}
@Test
public void testLineBreaks() throws Exception {
byte[] multiplexed = lines("@1", "two", "@1", "lines", "");
try (StreamDemultiplexer demux = new StreamDemultiplexer((byte) '1', out)) {
demux.write(multiplexed);
demux.flush();
assertEquals("two\nlines\n", out.toString("ISO-8859-1"));
}
}
@Test
public void testMultiplexAndBackWithHelloWorld() throws Exception {
StreamDemultiplexer demux = new StreamDemultiplexer((byte) '1', out);
StreamMultiplexer mux = new StreamMultiplexer(demux);
OutputStream out = mux.createStdout();
out.write(inAnsi("Hello, world."));
out.flush();
assertEquals("Hello, world.", toAnsi(this.out));
}
@Test
public void testMultiplexDemultiplexBinaryStress() throws Exception {
StreamDemultiplexer demux = new StreamDemultiplexer((byte) '1', out, err, ctl);
StreamMultiplexer mux = new StreamMultiplexer(demux);
OutputStream[] muxOuts = {mux.createStdout(), mux.createStderr(), mux.createControl()};
ByteArrayOutputStream[] expectedOuts =
{new ByteArrayOutputStream(), new ByteArrayOutputStream(), new ByteArrayOutputStream()};
Random random = new Random(0xdeadbeef);
for (int round = 0; round < 100; round++) {
byte[] buffer = new byte[random.nextInt(100)];
random.nextBytes(buffer);
int streamId = random.nextInt(3);
expectedOuts[streamId].write(buffer);
expectedOuts[streamId].flush();
muxOuts[streamId].write(buffer);
muxOuts[streamId].flush();
}
assertArrayEquals(expectedOuts[0].toByteArray(), out.toByteArray());
assertArrayEquals(expectedOuts[1].toByteArray(), err.toByteArray());
assertArrayEquals(expectedOuts[2].toByteArray(), ctl.toByteArray());
}
}
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