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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.controller.restapi.zone.v1;
import com.yahoo.config.provision.Environment;
import com.yahoo.config.provision.RegionName;
import com.yahoo.config.provision.Zone;
import com.yahoo.container.jdisc.HttpRequest;
import com.yahoo.container.jdisc.HttpResponse;
import com.yahoo.container.jdisc.LoggingRequestHandler;
import com.yahoo.container.logging.AccessLog;
import com.yahoo.slime.Cursor;
import com.yahoo.slime.Slime;
import com.yahoo.vespa.hosted.controller.api.integration.zone.ZoneRegistry;
import com.yahoo.vespa.hosted.controller.restapi.ErrorResponse;
import com.yahoo.vespa.hosted.controller.restapi.Path;
import com.yahoo.vespa.hosted.controller.restapi.SlimeJsonResponse;
import com.yahoo.yolean.Exceptions;
import java.util.Comparator;
import java.util.List;
import java.util.concurrent.Executor;
import java.util.logging.Level;
import java.util.stream.Collectors;
/**
* REST API that provides information about Hosted Vespa zones (version 1)
*
* @author mpolden
*/
@SuppressWarnings("unused")
public class ZoneApiHandler extends LoggingRequestHandler {
private final ZoneRegistry zoneRegistry;
public ZoneApiHandler(Executor executor, AccessLog accessLog, ZoneRegistry zoneRegistry) {
super(executor, accessLog);
this.zoneRegistry = zoneRegistry;
}
@Override
public HttpResponse handle(HttpRequest request) {
try {
switch (request.getMethod()) {
case GET:
return get(request);
default:
return ErrorResponse.methodNotAllowed("Method '" + request.getMethod() + "' is unsupported");
}
} catch (IllegalArgumentException e) {
return ErrorResponse.badRequest(Exceptions.toMessageString(e));
} catch (RuntimeException e) {
log.log(Level.WARNING, "Unexpected error handling '" + request.getUri() + "'", e);
return ErrorResponse.internalServerError(Exceptions.toMessageString(e));
}
}
private HttpResponse get(HttpRequest request) {
Path path = new Path(request.getUri().getPath());
if (path.matches("/zone/v1")) {
return root(request);
}
if (path.matches("/zone/v1/environment/{environment}")) {
return environment(request, Environment.from(path.get("environment")));
}
if (path.matches("/zone/v1/environment/{environment}/default")) {
return defaultRegion(request, Environment.from(path.get("environment")));
}
return notFound(path);
}
private HttpResponse root(HttpRequest request) {
List<Environment> environments = zoneRegistry.zones().stream()
.map(Zone::environment)
.distinct()
.sorted(Comparator.comparing(Environment::value))
.collect(Collectors.toList());
Slime slime = new Slime();
Cursor root = slime.setArray();
environments.forEach(environment -> {
Cursor object = root.addObject();
object.setString("name", environment.value());
// Returning /zone/v2 is a bit strange, but that's what the original Jersey implementation did
object.setString("url", request.getUri()
.resolve("/zone/v2/environment/")
.resolve(environment.value())
.toString());
});
return new SlimeJsonResponse(slime);
}
private HttpResponse environment(HttpRequest request, Environment environment) {
List<Zone> zones = zoneRegistry.zones().stream()
.filter(zone -> zone.environment() == environment)
.collect(Collectors.toList());
Slime slime = new Slime();
Cursor root = slime.setArray();
zones.forEach(zone -> {
Cursor object = root.addObject();
object.setString("name", zone.region().value());
object.setString("url", request.getUri()
.resolve("/zone/v2/environment/")
.resolve(environment.value() + "/")
.resolve("region/")
.resolve(zone.region().value())
.toString());
});
return new SlimeJsonResponse(slime);
}
private HttpResponse defaultRegion(HttpRequest request, Environment environment) {
RegionName region = zoneRegistry.getDefaultRegion(environment)
.orElseThrow(() -> new IllegalArgumentException(
"No default region for environment: " + environment
));
Slime slime = new Slime();
Cursor root = slime.setObject();
root.setString("name", region.value());
root.setString("url", request.getUri().resolve("region").resolve(region.value()).toString());
return new SlimeJsonResponse(slime);
}
private HttpResponse notFound(Path path) {
return ErrorResponse.notFoundError("Nothing at " + path);
}
private static String url(HttpRequest request, String path) {
return request.getUri().resolve(path).toString();
}
}
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