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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.config.server.application;
import com.google.inject.Inject;
import com.yahoo.config.model.api.HostInfo;
import com.yahoo.config.model.api.PortInfo;
import com.yahoo.config.model.api.ServiceInfo;
import com.yahoo.container.jdisc.HttpResponse;
import com.yahoo.log.LogLevel;
import com.yahoo.vespa.config.server.http.HttpErrorResponse;
import com.yahoo.vespa.config.server.http.HttpFetcher;
import com.yahoo.vespa.config.server.http.NotFoundException;
import com.yahoo.vespa.config.server.http.SimpleHttpFetcher;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.logging.Logger;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class HttpProxy {
private static Logger logger = Logger.getLogger(HttpProxy.class.getName());
private final HttpFetcher fetcher;
@Inject
public HttpProxy() { this(new SimpleHttpFetcher()); }
public HttpProxy(HttpFetcher fetcher) {
this.fetcher = fetcher;
}
public HttpResponse get(Application application, String hostName, String serviceType, String relativePath) {
HostInfo host = application.getModel().getHosts().stream()
.filter(hostInfo -> hostInfo.getHostname().equals(hostName))
.findFirst()
.orElseThrow(() -> new NotFoundException("Failed to find host " + hostName));
ServiceInfo service = host.getServices().stream()
.filter(serviceInfo -> serviceType.equals(serviceInfo.getServiceType()))
.findFirst()
.orElseThrow(() -> new NotFoundException("Failed to find any service of type " + serviceType
+ " on host " + hostName));
// "http" and "state" seems to uniquely identify an interesting HTTP port on each service
PortInfo port = service.getPorts().stream()
.filter(portInfo -> portInfo.getTags().stream().collect(Collectors.toSet()).containsAll(
Stream.of("http", "state").collect(Collectors.toSet())))
.findFirst()
.orElseThrow(() -> new NotFoundException("Failed to find HTTP state port"));
return internalGet(host.getHostname(), port.getPort(), relativePath);
}
private HttpResponse internalGet(String hostname, int port, String relativePath) {
String urlString = "http://" + hostname + ":" + port + "/" + relativePath;
URL url;
try {
url = new URL(urlString);
} catch (MalformedURLException e) {
logger.log(LogLevel.WARNING, "Badly formed url: " + urlString, e);
return HttpErrorResponse.internalServerError("Failed to construct URL for backend");
}
HttpFetcher.Params params = new HttpFetcher.Params(2000); // 2_000 ms read timeout
return fetcher.get(params, url);
}
}
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