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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 com.google.devtools.build.lib.util.StringUtilities.joinLines;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import com.google.common.io.ByteStreams;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
/**
* Test for {@link StreamMultiplexer}.
*/
@RunWith(JUnit4.class)
public class StreamMultiplexerTest {
private ByteArrayOutputStream multiplexed;
private OutputStream out;
private OutputStream err;
private OutputStream ctl;
@Before
public void setUp() throws Exception {
multiplexed = new ByteArrayOutputStream();
StreamMultiplexer multiplexer = new StreamMultiplexer(multiplexed);
out = multiplexer.createStdout();
err = multiplexer.createStderr();
ctl = multiplexer.createControl();
}
@Test
public void testEmptyWire() throws IOException {
out.flush();
err.flush();
ctl.flush();
assertEquals(0, multiplexed.toByteArray().length);
}
private static byte[] getLatin(String string)
throws UnsupportedEncodingException {
return string.getBytes("ISO-8859-1");
}
private static String getLatin(byte[] bytes)
throws UnsupportedEncodingException {
return new String(bytes, "ISO-8859-1");
}
@Test
public void testHelloWorldOnStdOut() throws IOException {
out.write(getLatin("Hello, world."));
out.flush();
assertEquals(joinLines("@1@", "Hello, world.", ""),
getLatin(multiplexed.toByteArray()));
}
@Test
public void testInterleavedStdoutStderrControl() throws Exception {
out.write(getLatin("Hello, stdout."));
out.flush();
err.write(getLatin("Hello, stderr."));
err.flush();
ctl.write(getLatin("Hello, control."));
ctl.flush();
out.write(getLatin("... and back!"));
out.flush();
assertEquals(joinLines("@1@", "Hello, stdout.",
"@2@", "Hello, stderr.",
"@3@", "Hello, control.",
"@1@", "... and back!",
""),
getLatin(multiplexed.toByteArray()));
}
@Test
public void testWillNotCommitToUnderlyingStreamUnlessFlushOrNewline()
throws Exception {
out.write(getLatin("There are no newline characters in here, so it won't" +
" get written just yet."));
assertArrayEquals(multiplexed.toByteArray(), new byte[0]);
}
@Test
public void testNewlineTriggersFlush() throws Exception {
out.write(getLatin("No newline just yet, so no flushing. "));
assertArrayEquals(multiplexed.toByteArray(), new byte[0]);
out.write(getLatin("OK, here we go:\nAnd more to come."));
String expected = joinLines("@1",
"No newline just yet, so no flushing. OK, here we go:", "");
assertEquals(expected, getLatin(multiplexed.toByteArray()));
out.write((byte) '\n');
expected += joinLines("@1", "And more to come.", "");
assertEquals(expected, getLatin(multiplexed.toByteArray()));
}
@Test
public void testFlush() throws Exception {
out.write(getLatin("Don't forget to flush!"));
assertArrayEquals(new byte[0], multiplexed.toByteArray());
out.flush(); // now the output will appear in multiplexed.
assertEquals(joinLines("@1@", "Don't forget to flush!", ""),
getLatin(multiplexed.toByteArray()));
}
@Test
public void testByteEncoding() throws IOException {
OutputStream devNull = ByteStreams.nullOutputStream();
StreamDemultiplexer demux = new StreamDemultiplexer((byte) '1', devNull);
StreamMultiplexer mux = new StreamMultiplexer(demux);
OutputStream out = mux.createStdout();
// When we cast 266 to a byte, we get 10. So basically, we ended up
// comparing 266 with 10 as an integer (because out.write takes an int),
// and then later cast it to 10. This way we'd end up with a control
// character \n in the middle of the payload which would then screw things
// up when the real control character arrived. The fixed version of the
// StreamMultiplexer avoids this problem by always casting to a byte before
// carrying out any comparisons.
out.write(266);
out.write(10);
}
}
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