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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.config.server.tenant;
import com.yahoo.config.model.api.ApplicationClusterEndpoint;
import com.yahoo.config.model.api.ContainerEndpoint;
import com.yahoo.slime.ArrayTraverser;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.Inspector;
import com.yahoo.slime.Slime;
import com.yahoo.slime.SlimeUtils;
import java.util.ArrayList;
import java.util.List;
/**
* Contains all methods for de-/serializing ContainerEndpoints to/from JSON.
* Also supports de-/serializing lists of these values.
*
* @author ogronnesby
*/
public class ContainerEndpointSerializer {
// WARNING: Since there are multiple servers in a ZooKeeper cluster and they upgrade one by one
// (and rewrite all nodes on startup), changes to the serialized format must be made
// such that what is serialized on version N+1 can be read by version N:
// - ADDING FIELDS: Always ok
// - REMOVING FIELDS: Stop reading the field first. Stop writing it on a later version.
// - CHANGING THE FORMAT OF A FIELD: Don't do it bro.
private static final String clusterIdField = "clusterId";
private static final String scopeField = "scope";
private static final String namesField = "names";
private static final String weightField = "weight";
private static final String routingMethodField = "routingMethod";
private ContainerEndpointSerializer() {}
public static ContainerEndpoint endpointFromSlime(Inspector inspector) {
final var clusterId = inspector.field(clusterIdField).asString();
final var scope = inspector.field(scopeField).asString();
final var namesInspector = inspector.field(namesField);
final var weight = SlimeUtils.optionalInteger(inspector.field(weightField));
// assign default routingmethod. Remove when 7.507 is latest version
// Cannot be used before all endpoints are assigned explicit routingmethod (from controller)
final var routingMethod = SlimeUtils.optionalString(inspector.field(routingMethodField)).orElse(ApplicationClusterEndpoint.RoutingMethod.sharedLayer4.name());
if (clusterId.isEmpty()) {
throw new IllegalStateException("'clusterId' missing on serialized ContainerEndpoint");
}
if (scope.isEmpty()) {
throw new IllegalStateException("'scope' missing on serialized ContainerEndpoint");
}
if (! namesInspector.valid()) {
throw new IllegalStateException("'names' missing on serialized ContainerEndpoint");
}
if(routingMethod.isEmpty()) {
throw new IllegalStateException("'routingMethod' missing on serialized ContainerEndpoint");
}
final var names = new ArrayList<String>();
namesInspector.traverse((ArrayTraverser) (idx, nameInspector) -> {
final var containerName = nameInspector.asString();
names.add(containerName);
});
return new ContainerEndpoint(clusterId, ApplicationClusterEndpoint.Scope.valueOf(scope), names, weight,
ApplicationClusterEndpoint.RoutingMethod.valueOf(routingMethod));
}
public static List<ContainerEndpoint> endpointListFromSlime(Slime slime) {
final var inspector = slime.get();
return endpointListFromSlime(inspector);
}
public static List<ContainerEndpoint> endpointListFromSlime(Inspector inspector) {
final var endpoints = new ArrayList<ContainerEndpoint>();
inspector.traverse((ArrayTraverser) (idx, endpointInspector) -> {
final var containerEndpoint = endpointFromSlime(endpointInspector);
endpoints.add(containerEndpoint);
});
return endpoints;
}
public static void endpointToSlime(Cursor cursor, ContainerEndpoint endpoint) {
cursor.setString(clusterIdField, endpoint.clusterId());
cursor.setString(scopeField, endpoint.scope().name());
endpoint.weight().ifPresent(w -> cursor.setLong(weightField, w));
final var namesInspector = cursor.setArray(namesField);
endpoint.names().forEach(namesInspector::addString);
cursor.setString(routingMethodField, endpoint.routingMethod().name());
}
public static Slime endpointListToSlime(List<ContainerEndpoint> endpoints) {
final var slime = new Slime();
final var cursor = slime.setArray();
endpoints.forEach(endpoint -> {
final var endpointCursor = cursor.addObject();
endpointToSlime(endpointCursor, endpoint);
});
return slime;
}
}
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