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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.vespa.hosted.provision.restapi;
import com.yahoo.config.provision.ApplicationId;
import com.yahoo.io.IOUtils;
import com.yahoo.slime.Inspector;
import com.yahoo.slime.SlimeUtils;
import com.yahoo.slime.Type;
import com.yahoo.transaction.Mutex;
import com.yahoo.vespa.hosted.provision.NodeRepository;
import com.yahoo.vespa.hosted.provision.applications.Application;
import java.io.IOException;
import java.io.InputStream;
import java.io.UncheckedIOException;
import java.time.Duration;
/**
* A class which can take a partial JSON node/v2 application JSON structure and apply it to an application object.
* This is a one-time use object.
*
* @author bratseth
*/
public class ApplicationPatcher implements AutoCloseable {
private final Inspector inspector;
private final Mutex lock;
private Application application;
public ApplicationPatcher(InputStream json, ApplicationId applicationId, NodeRepository nodeRepository) {
try {
this.inspector = SlimeUtils.jsonToSlime(IOUtils.readBytes(json, 1000 * 1000)).get();
} catch (IOException e) {
throw new UncheckedIOException("Error reading request body", e);
}
// Use same timeout for acquiring lock as client timeout for patch request
this.lock = nodeRepository.applications().lock(applicationId, Duration.ofSeconds(30));
try {
this.application = nodeRepository.applications().require(applicationId);
}
catch (RuntimeException e) {
lock.close();
throw e;
}
}
/** Applies the json to the application and returns it. */
public Application apply() {
inspector.traverse((String name, Inspector value) -> {
try {
application = applyField(application, name, value);
} catch (IllegalArgumentException e) {
throw new IllegalArgumentException("Could not set field '" + name + "'", e);
}
});
return application;
}
/** Returns the application in its current state (patch applied or not) */
public Application application() { return application; }
public Mutex lock() { return lock; }
@Override
public void close() {
lock.close();
}
private Application applyField(Application application, String name, Inspector value) {
return switch (name) {
case "currentReadShare" -> application.with(application.status().withCurrentReadShare(asDouble(value)));
case "maxReadShare" -> application.with(application.status().withMaxReadShare(asDouble(value)));
default -> throw new IllegalArgumentException("Could not apply field '" + name +
"' on an application: No such modifiable field");
};
}
private Double asDouble(Inspector field) {
if (field.type() != Type.DOUBLE)
throw new IllegalArgumentException("Expected a DOUBLE value, got a " + field.type());
return field.asDouble();
}
}
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