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/*
* Copyright 2019 Oath Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
*/
package ai.vespa.metricsproxy.http;
import ai.vespa.metricsproxy.core.MetricsConsumers;
import ai.vespa.metricsproxy.core.MetricsManager;
import ai.vespa.metricsproxy.metric.model.json.JsonRenderingException;
import ai.vespa.metricsproxy.service.VespaServices;
import com.google.inject.Inject;
import com.yahoo.container.jdisc.HttpRequest;
import com.yahoo.container.jdisc.HttpResponse;
import com.yahoo.container.jdisc.ThreadedHttpRequestHandler;
import com.yahoo.restapi.Path;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.net.URI;
import java.util.concurrent.Executor;
import static com.yahoo.jdisc.Response.Status.INTERNAL_SERVER_ERROR;
import static com.yahoo.jdisc.Response.Status.METHOD_NOT_ALLOWED;
import static com.yahoo.jdisc.Response.Status.NOT_FOUND;
import static com.yahoo.jdisc.Response.Status.OK;
import static com.yahoo.jdisc.http.HttpRequest.Method.GET;
/**
* Http handler for the metrics/v1 rest api.
*
* @author gjoranv
*/
public class MetricsHandler extends ThreadedHttpRequestHandler {
static final String V1_PATH = "/metrics/v1";
static final String VALUES_PATH = V1_PATH + "/values";
private final ValuesFetcher valuesFetcher;
@Inject
public MetricsHandler(Executor executor,
MetricsManager metricsManager,
VespaServices vespaServices,
MetricsConsumers metricsConsumers) {
super(executor);
valuesFetcher = new ValuesFetcher(metricsManager, vespaServices, metricsConsumers);
}
@Override
public HttpResponse handle(HttpRequest request) {
if (request.getMethod() != GET) return new JsonResponse(METHOD_NOT_ALLOWED, "Only GET is supported");
Path path = new Path(request.getUri());
if (path.matches(V1_PATH)) return v1Response(request.getUri());
if (path.matches(VALUES_PATH)) return valuesResponse(request);
return new ErrorResponse(NOT_FOUND, "No content at given path");
}
private JsonResponse v1Response(URI requestUri) {
try {
return new JsonResponse(OK, v1Content(requestUri));
} catch (JSONException e) {
log.warning("Bad JSON construction in " + V1_PATH + " response: " + e.getMessage());
return new ErrorResponse(INTERNAL_SERVER_ERROR,
"An error occurred, please try path '" + VALUES_PATH + "'");
}
}
private JsonResponse valuesResponse(HttpRequest request) {
try {
return new JsonResponse(OK, valuesFetcher.fetch(request.getProperty("consumer")));
} catch (JsonRenderingException e) {
return new ErrorResponse(INTERNAL_SERVER_ERROR, e.getMessage());
}
}
// TODO: Use jackson with a "Resources" class instead of JSONObject
private String v1Content(URI requestUri) throws JSONException {
int port = requestUri.getPort();
String host = requestUri.getHost();
StringBuilder base = new StringBuilder("http://");
base.append(host);
if (port >= 0) {
base.append(":").append(port);
}
String uriBase = base.toString();
JSONArray linkList = new JSONArray();
for (String api : new String[] {VALUES_PATH}) {
JSONObject resource = new JSONObject();
resource.put("url", uriBase + api);
linkList.put(resource);
}
return new JSONObject().put("resources", linkList).toString(4);
}
}
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