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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.controller.restapi.zone.v2;
import ai.vespa.http.HttpURL;
import com.yahoo.config.provision.CloudName;
import com.yahoo.config.provision.zone.ZoneId;
import com.yahoo.config.provision.zone.ZoneList;
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.controller.Controller;
import com.yahoo.vespa.hosted.controller.api.integration.ServiceRegistry;
import com.yahoo.vespa.hosted.controller.api.integration.zone.ZoneRegistry;
import com.yahoo.vespa.hosted.controller.auditlog.AuditLoggingRequestHandler;
import com.yahoo.vespa.hosted.controller.proxy.ConfigServerRestExecutor;
import com.yahoo.vespa.hosted.controller.proxy.ProxyRequest;
import com.yahoo.vespa.hosted.controller.restapi.ErrorResponses;
import com.yahoo.yolean.Exceptions;
/**
* REST API for proxying requests to config servers in a given zone (version 2).
*
* This API does something completely different from /zone/v1, but such is the world.
*
* @author mpolden
*/
@SuppressWarnings("unused")
public class ZoneApiHandler extends AuditLoggingRequestHandler {
private final ZoneRegistry zoneRegistry;
private final ConfigServerRestExecutor proxy;
public ZoneApiHandler(ThreadedHttpRequestHandler.Context parentCtx, ServiceRegistry serviceRegistry,
ConfigServerRestExecutor proxy, Controller controller) {
super(parentCtx, controller.auditLogger());
this.zoneRegistry = serviceRegistry.zoneRegistry();
this.proxy = proxy;
}
@Override
public HttpResponse auditAndHandle(HttpRequest request) {
try {
return switch (request.getMethod()) {
case GET -> get(request);
case POST, PUT, DELETE, PATCH -> proxy(request);
default -> ErrorResponse.methodNotAllowed("Method '" + request.getMethod() + "' is unsupported");
};
} catch (IllegalArgumentException e) {
return ErrorResponse.badRequest(Exceptions.toMessageString(e));
} catch (RuntimeException e) {
return ErrorResponses.logThrowing(request, log, e);
}
}
private HttpResponse get(HttpRequest request) {
Path path = new Path(request.getUri());
if (path.matches("/zone/v2")) {
return root(request);
}
return proxy(request);
}
private HttpResponse proxy(HttpRequest request) {
Path path = new Path(request.getUri());
if ( ! path.matches("/zone/v2/{environment}/{region}/{*}")) {
return notFound(path);
}
ZoneId zoneId = ZoneId.from(path.get("environment"), path.get("region"));
if ( ! zoneRegistry.hasZone(zoneId)) {
throw new IllegalArgumentException("No such zone: " + zoneId.value());
}
return proxy.handle(proxyRequest(zoneId, path.getRest(), request));
}
private HttpResponse root(HttpRequest request) {
Slime slime = new Slime();
Cursor root = slime.setObject();
Cursor uris = root.setArray("uris");
ZoneList zoneList = zoneRegistry.zones().reachable();
zoneList.zones().forEach(zone -> uris.addString(request.getUri()
.resolve("/zone/v2/")
.resolve(zone.getEnvironment().value() + "/")
.resolve(zone.getRegionName().value())
.toString()));
Cursor zones = root.setArray("zones");
zoneList.zones().forEach(zone -> {
Cursor object = zones.addObject();
object.setString("environment", zone.getEnvironment().value());
object.setString("region", zone.getRegionName().value());
});
return new SlimeJsonResponse(slime);
}
private HttpResponse notFound(Path path) {
return ErrorResponse.notFoundError("Nothing at " + path);
}
private ProxyRequest proxyRequest(ZoneId zoneId, HttpURL.Path path, HttpRequest request) {
return ProxyRequest.tryOne(zoneRegistry.getConfigServerVipUri(zoneId, zoneRegistry.systemZone().getCloudName().equals(CloudName.AWS)),
path, request);
}
}
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