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BuildWatcher.java
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BuildWatcher.java
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/*
* The MIT License
*
* Copyright 2015 Jesse Glick.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.jenkinsci.plugins.workflow;
import hudson.Extension;
import hudson.console.AnnotatedLargeText;
import hudson.console.LineTransformationOutputStream;
import hudson.model.Run;
import hudson.model.TaskListener;
import hudson.model.listeners.RunListener;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.junit.rules.ExternalResource;
import org.jvnet.hudson.test.JenkinsRule;
import org.jvnet.hudson.test.RestartableJenkinsRule;
// TODO use standard version 1.607+
/**
* Echoes build output to standard error as it arrives.
* Usage: <pre>{@code @ClassRule public static BuildWatcher buildWatcher = new BuildWatcher();}</pre>
* Should work in combination with {@link JenkinsRule} or {@link RestartableJenkinsRule}.
*/
public final class BuildWatcher extends ExternalResource {
private static boolean active;
private static final Map<File,RunningBuild> builds = new ConcurrentHashMap<File,RunningBuild>();
private Thread thread;
@Override protected void before() throws Throwable {
active = true;
thread = new Thread("watching builds") {
@Override public void run() {
try {
while (active) {
for (RunningBuild build : builds.values()) {
build.copy();
}
Thread.sleep(50);
}
} catch (InterruptedException x) {
// stopped
}
// last chance
for (RunningBuild build : builds.values()) {
build.copy();
}
}
};
thread.setDaemon(true);
thread.start();
}
@Override protected void after() {
active = false;
thread.interrupt();
}
@Extension public static final class Listener extends RunListener<Run<?,?>> {
@Override public void onStarted(Run<?,?> r, TaskListener listener) {
if (!active) {
return;
}
RunningBuild build = new RunningBuild(r);
RunningBuild orig = builds.put(r.getLogFile(), build);
if (orig != null) {
System.err.println(r + " was started twice?!");
}
}
@Override public void onFinalized(Run<?,?> r) {
if (!active) {
return;
}
RunningBuild build = builds.remove(r.getLogFile());
if (build != null) {
build.copy();
} else {
System.err.println(r + " was finalized but not started?!");
}
}
}
private static final class RunningBuild {
private final AnnotatedLargeText<?> log;
private final OutputStream sink;
private long pos;
RunningBuild(Run<?,?> r) {
log = r.getLogText();
sink = new LogLinePrefixOutputFilter(System.err, "[" + r + "] ");
}
synchronized void copy() {
try {
pos = log.writeLogTo(pos, sink);
// Note that !log.isComplete() after the initial call to copy, even if the build is complete, because Run.getLogText never calls markComplete!
// That is why Run.writeWholeLogTo calls getLogText repeatedly.
// Even if it did call markComplete this might not work from RestartableJenkinsRule since you would have a different Run object after the restart.
// Anyway we can just rely on onFinalized to let us know when to stop.
} catch (FileNotFoundException x) {
// build deleted or not started
} catch (Exception x) {
x.printStackTrace();
}
}
}
// Copied from WorkflowRun.
private static final class LogLinePrefixOutputFilter extends LineTransformationOutputStream {
private final PrintStream logger;
private final String prefix;
LogLinePrefixOutputFilter(PrintStream logger, String prefix) {
this.logger = logger;
this.prefix = prefix;
}
@Override protected void eol(byte[] b, int len) throws IOException {
logger.append(prefix);
logger.write(b, 0, len);
}
}
}