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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.routing.restapi;
import com.yahoo.component.annotation.Inject;
import com.yahoo.config.provision.zone.RoutingMethod;
import com.yahoo.container.jdisc.HttpRequest;
import com.yahoo.container.jdisc.HttpResponse;
import com.yahoo.container.jdisc.ThreadedHttpRequestHandler;
import com.yahoo.restapi.ErrorResponse;
import com.yahoo.restapi.Path;
import com.yahoo.restapi.SlimeJsonResponse;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.Slime;
import com.yahoo.vespa.hosted.routing.RoutingGenerator;
import com.yahoo.vespa.hosted.routing.RoutingTable;
import com.yahoo.vespa.hosted.routing.status.HealthStatus;
import com.yahoo.vespa.hosted.routing.status.RoutingStatus;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Supplier;
/**
* This handler implements the /akamai health check.
*
* The global routing service polls /akamai to determine if a deployment should receive requests via its global
* endpoint.
*
* @author oyving
* @author mpolden
* @author Torbjorn Smorgrav
* @author Wacek Kusnierczyk
*/
public class AkamaiHandler extends ThreadedHttpRequestHandler {
public static final String
ROTATION_UNKNOWN_MESSAGE = "Rotation not found",
ROTATION_UNAVAILABLE_MESSAGE = "Rotation set unavailable",
ROTATION_UNHEALTHY_MESSAGE = "Rotation unhealthy",
ROTATION_INACTIVE_MESSAGE = "Rotation not available",
ROTATION_OK_MESSAGE = "Rotation OK";
private final RoutingStatus routingStatus;
private final HealthStatus healthStatus;
private final Supplier<Optional<RoutingTable>> tableSupplier;
@Inject
public AkamaiHandler(Context parentCtx,
RoutingGenerator routingGenerator,
RoutingStatus routingStatus,
HealthStatus healthStatus) {
this(parentCtx, routingGenerator::routingTable, routingStatus, healthStatus);
}
AkamaiHandler(Context parentCtx,
Supplier<Optional<RoutingTable>> tableSupplier,
RoutingStatus routingStatus,
HealthStatus healthStatus) {
super(parentCtx);
this.routingStatus = Objects.requireNonNull(routingStatus);
this.healthStatus = Objects.requireNonNull(healthStatus);
this.tableSupplier = Objects.requireNonNull(tableSupplier);
}
@Override
public HttpResponse handle(HttpRequest request) {
Path path = new Path(request.getUri());
if (path.matches("/akamai/v1/status")) {
return status(request);
}
return ErrorResponse.notFoundError("Nothing at " + path);
}
private HttpResponse status(HttpRequest request) {
String hostHeader = request.getHeader("host");
String hostname = withoutPort(hostHeader);
Optional<RoutingTable.Target> target = tableSupplier.get().flatMap(table -> table.targetOf(hostname, RoutingMethod.sharedLayer4));
if (target.isEmpty())
return response(404, hostHeader, "", ROTATION_UNKNOWN_MESSAGE);
if (!target.get().active())
return response(404, hostHeader, "", ROTATION_INACTIVE_MESSAGE);
String upstreamName = target.get().id();
if (!routingStatus.isActive(upstreamName))
return response(404, hostHeader, upstreamName, ROTATION_UNAVAILABLE_MESSAGE);
if (!healthStatus.servers().isHealthy(upstreamName))
return response(502, hostHeader, upstreamName, ROTATION_UNHEALTHY_MESSAGE);
return response(200, hostHeader, upstreamName, ROTATION_OK_MESSAGE);
}
private static HttpResponse response(int status, String hostname, String name, String message) {
Slime slime = new Slime();
Cursor root = slime.setObject();
root.setString("hostname", hostname);
root.setString("upstream", name);
root.setString("message", message);
return new SlimeJsonResponse(status, slime);
}
private static String withoutPort(String hostHeader) {
return hostHeader.replaceFirst("(:[\\d]+)?$", "");
}
}
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