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// Copyright Verizon Media. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.provision.restapi;
import com.yahoo.container.jdisc.HttpResponse;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.JsonFormat;
import com.yahoo.slime.Slime;
import com.yahoo.vespa.curator.stats.LockAttempt;
import com.yahoo.vespa.curator.stats.LockCounters;
import com.yahoo.vespa.curator.stats.ThreadLockStats;
import java.io.IOException;
import java.io.OutputStream;
import java.time.Instant;
import java.util.List;
import java.util.TreeMap;
/**
* Returns information related to ZooKeeper locks.
*
* @author hakon
*/
public class LocksResponse extends HttpResponse {
private final Slime slime = new Slime();
public LocksResponse() {
this(new TreeMap<>(ThreadLockStats.getLockCountersByPath()),
ThreadLockStats.getThreadLockStats(),
ThreadLockStats.getLockAttemptSamples());
}
/** For testing */
LocksResponse(TreeMap<String, LockCounters> lockCountersByPath,
List<ThreadLockStats> threadLockStatsList,
List<LockAttempt> historicSamples) {
super(200);
Cursor root = slime.setObject();
Cursor lockPathsCursor = root.setArray("lock-paths");
lockCountersByPath.forEach((lockPath, lockCounters) -> {
Cursor lockPathCursor = lockPathsCursor.addObject();
lockPathCursor.setString("path", lockPath);
lockPathCursor.setLong("in-critical-region", lockCounters.inCriticalRegionCount());
lockPathCursor.setLong("invoke-acquire", lockCounters.invokeAcquireCount());
lockPathCursor.setLong("acquire-failed", lockCounters.acquireFailedCount());
lockPathCursor.setLong("acquire-timed-out", lockCounters.acquireTimedOutCount());
lockPathCursor.setLong("lock-acquired", lockCounters.lockAcquiredCount());
lockPathCursor.setLong("locks-released", lockCounters.locksReleasedCount());
lockPathCursor.setLong("no-locks-errors", lockCounters.noLocksErrorCount());
lockPathCursor.setLong("lock-release-errors", lockCounters.lockReleaseErrorCount());
});
Cursor threadsCursor = root.setArray("threads");
for (var threadLockStats : threadLockStatsList) {
List<LockAttempt> lockAttempts = threadLockStats.getLockAttempts();
if (!lockAttempts.isEmpty()) {
Cursor threadLockStatsCursor = threadsCursor.addObject();
threadLockStatsCursor.setString("thread-name", threadLockStats.getThreadName());
Cursor lockAttemptsCursor = threadLockStatsCursor.setArray("active-locks");
for (var lockAttempt : lockAttempts) {
setLockAttempt(lockAttemptsCursor.addObject(), lockAttempt, false);
}
threadLockStatsCursor.setString("stack-trace", threadLockStats.getStackTrace());
}
}
Cursor historicSamplesCursor = root.setArray("historic-samples");
historicSamples.forEach(lockAttempt -> setLockAttempt(historicSamplesCursor.addObject(), lockAttempt, true));
}
@Override
public void render(OutputStream stream) throws IOException {
new JsonFormat(true).encode(stream, slime);
}
@Override
public String getContentType() {
return "application/json";
}
private void setLockAttempt(Cursor lockAttemptCursor, LockAttempt lockAttempt, boolean includeThreadInfo) {
if (includeThreadInfo) {
lockAttemptCursor.setString("thread-name", lockAttempt.getThreadName());
}
lockAttemptCursor.setString("lock-path", lockAttempt.getLockPath());
lockAttemptCursor.setString("invoke-acquire-time", toString(lockAttempt.getTimeAcquiredWasInvoked()));
lockAttemptCursor.setString("acquire-timeout", lockAttempt.getAcquireTimeout().toString());
lockAttempt.getTimeLockWasAcquired().ifPresent(instant -> lockAttemptCursor.setString("lock-acquired-time", toString(instant)));
lockAttemptCursor.setString("lock-state", lockAttempt.getLockState().name());
lockAttempt.getTimeTerminalStateWasReached().ifPresent(instant -> lockAttemptCursor.setString("terminal-state-time", toString(instant)));
lockAttemptCursor.setString("acquire-duration", lockAttempt.getDurationOfAcquire().toString());
lockAttemptCursor.setString("locked-duration", lockAttempt.getDurationWithLock().toString());
lockAttemptCursor.setString("total-duration", lockAttempt.getDuration().toString());
if (includeThreadInfo) {
lockAttempt.getStackTrace().ifPresent(stackTrace -> lockAttemptCursor.setString("stack-trace", stackTrace));
}
}
private static String toString(Instant time) {
return Instant.ofEpochMilli(time.toEpochMilli()).toString();
}
}
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