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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.filedistribution.fileacquirer;
import com.yahoo.cloud.config.filedistribution.FiledistributorrpcConfig;
import com.yahoo.config.FileReference;
import com.yahoo.config.subscription.ConfigSubscriber;
import com.yahoo.jrt.ErrorCode;
import com.yahoo.jrt.Request;
import com.yahoo.jrt.Spec;
import com.yahoo.jrt.StringValue;
import com.yahoo.jrt.Supervisor;
import com.yahoo.jrt.Target;
import com.yahoo.jrt.Transport;
import com.yahoo.vespa.config.FileReferenceDoesNotExistException;
import java.io.File;
import java.time.Duration;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Retrieves the path to a file or directory on the local file system
* that has been transferred with the vespa file distribution
* mechanism.
*
* Intended to be the only real implementation of FileAcquirer.
*
* @author Tony Vaagenes
*/
class FileAcquirerImpl implements FileAcquirer {
static final class FileDistributionErrorCode {
public static final int baseErrorCode = 0x10000;
public static final int baseFileProviderErrorCode = baseErrorCode + 0x1000;
public static final int fileReferenceDoesNotExists = baseFileProviderErrorCode;
}
private static final Logger log = Logger.getLogger(FileAcquirerImpl.class.getName());
private final Supervisor supervisor = new Supervisor(new Transport("fileaquirer"));
private final ConfigSubscriber configSubscriber;
private class Connection implements ConfigSubscriber.SingleSubscriber<FiledistributorrpcConfig> {
private final Lock targetLock = new ReentrantLock();
private Target target;
private volatile Spec spec;
private long pauseTime = 0; //milliseconds
private long nextLogTime = 0;
private long logCount = 0;
private void connect(Timer timer) throws InterruptedException {
while (timer.isTimeLeft()) {
pause();
target = supervisor.connect(spec);
// ping to check if connection is working
Request request = new Request("frt.rpc.ping");
target.invokeSync(request, Duration.ofSeconds(5));
if (request.isError()) {
logWarning();
target.close();
} else {
log.log(Level.FINE, () -> "Successfully connected to '" + spec + "', this = " + System.identityHashCode(this));
pauseTime = 0;
logCount = 0;
return;
}
}
}
private void pause() throws InterruptedException {
if (pauseTime > 0) {
Thread.sleep(pauseTime);
pauseTime = Math.min((long)(pauseTime*1.5), TimeUnit.MINUTES.toMillis(1));
} else {
pauseTime = 500;
}
}
private void logWarning() {
if (logCount == 0 || System.currentTimeMillis() > nextLogTime ) {
log.warning("Could not connect to the config proxy '" + spec.toString() + "'" + " - " + this + "@" + System.identityHashCode(this));
nextLogTime = System.currentTimeMillis() +
Math.min(TimeUnit.DAYS.toMillis(1),
TimeUnit.SECONDS.toMillis(30) * (++logCount));
log.info("Next log time = " + nextLogTime + ", current = " + System.currentTimeMillis());
}
}
@Override
public void configure(FiledistributorrpcConfig filedistributorrpcConfig) {
spec = new Spec(filedistributorrpcConfig.connectionspec());
}
public Target getTarget(Timer timer) throws InterruptedException {
TimeUnit unit = TimeUnit.MILLISECONDS;
targetLock.tryLock(timer.timeLeft(unit) , unit );
try {
if (target == null || !target.isValid())
connect(timer);
return target;
} finally {
targetLock.unlock();
}
}
}
private final Connection connection = new Connection();
private boolean temporaryError(int errorCode) {
return switch (errorCode) {
case ErrorCode.ABORT, ErrorCode.CONNECTION, ErrorCode.GENERAL_ERROR, ErrorCode.OVERLOAD, ErrorCode.TIMEOUT -> true;
default -> false;
};
}
public FileAcquirerImpl(String configId) {
configSubscriber = new ConfigSubscriber();
configSubscriber.subscribe(connection, FiledistributorrpcConfig.class, configId);
}
public void shutdown() {
configSubscriber.close();
supervisor.transport().shutdown().join();
}
/**
* Returns the path to a file or directory corresponding to the
* given file reference. File references are produced by the
* config system.
*
* @throws TimeoutException if the file or directory could not be retrieved in time.
* @throws FileReferenceDoesNotExistException if the file is no longer available (due to reloading of config).
*/
public File waitFor(FileReference fileReference, long timeout, TimeUnit timeUnit) throws InterruptedException {
Timer timer = new Timer(timeout, timeUnit);
do {
Target target = connection.getTarget(timer);
if (target == null)
break;
Request request = new Request("waitFor");
request.parameters().add(new StringValue(fileReference.value()));
double rpcTimeout = Math.min(timer.timeLeft(TimeUnit.SECONDS), 60.0);
log.log(Level.FINE, () -> "InvokeSync waitFor " + fileReference + " with " + rpcTimeout + " seconds timeout");
target.invokeSync(request, rpcTimeout);
if (request.checkReturnTypes("s")) {
return new File(request.returnValues().get(0).asString());
} else if (!request.isError()) {
throw new RuntimeException("Invalid response: " + request.returnValues());
} else if (temporaryError(request.errorCode())) {
log.log(Level.INFO, "Retrying waitFor for " + fileReference + ": " + request.errorCode() + " -- " + request.errorMessage());
Thread.sleep(1000);
} else {
if (request.errorCode() == FileDistributionErrorCode.fileReferenceDoesNotExists)
throw new FileReferenceDoesNotExistException(fileReference.value());
else
throw new RuntimeException("Wait for " + fileReference + " failed: " + request.errorMessage() + " (" + request.errorCode() + ")");
}
} while ( timer.isTimeLeft() );
throw new TimeoutException("Timed out waiting for " + fileReference + " after " + timeout + " " + timeUnit.name().toLowerCase());
}
}
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