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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.config.server.application;
import ai.vespa.http.DomainName;
import ai.vespa.http.HttpURL;
import ai.vespa.http.HttpURL.Path;
import ai.vespa.http.HttpURL.Query;
import ai.vespa.http.HttpURL.Scheme;
import com.yahoo.component.annotation.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.config.provision.security.NodeHostnameVerifier;
import com.yahoo.container.jdisc.HttpResponse;
import com.yahoo.vespa.config.server.http.HttpFetcher;
import com.yahoo.vespa.config.server.http.HttpFetcher.Params;
import com.yahoo.vespa.config.server.http.NotFoundException;
import com.yahoo.vespa.config.server.http.SimpleHttpFetcher;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.time.Duration;
import java.util.List;
import static java.nio.charset.StandardCharsets.UTF_8;
public class HttpProxy {
private final HttpFetcher fetcher;
@Inject public HttpProxy(NodeHostnameVerifier verifier) { this(new SimpleHttpFetcher(Duration.ofSeconds(30), verifier)); }
public HttpProxy(HttpFetcher fetcher) { this.fetcher = fetcher; }
public HttpResponse get(Application application, String hostName, String serviceType, Path path, Query query) {
return get(application, hostName, serviceType, path, query, null);
}
public HttpResponse get(Application application, String hostName, String serviceType, Path path, Query query, HttpURL forwardedUrl) {
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().containsAll(List.of("http", "state")))
.findFirst()
.orElseThrow(() -> new NotFoundException("Failed to find HTTP state port"));
HttpURL url = HttpURL.create(Scheme.http, DomainName.of(host.getHostname()), port.getPort(), path, query);
HttpResponse response = fetcher.get(new Params(29_000), // 29 sec (30 sec on controller)
url.asURI());
return forwardedUrl == null ? response : new UrlRewritingProxyResponse(response, url, forwardedUrl);
}
static class UrlRewritingProxyResponse extends HttpResponse {
final HttpResponse wrapped;
final String patten;
final String replacement;
public UrlRewritingProxyResponse(HttpResponse wrapped, HttpURL requestUrl, HttpURL forwardedUrl) {
super(wrapped.getStatus());
this.wrapped = wrapped;
this.patten = requestUrl.withPath(requestUrl.path().withoutTrailingSlash()).withQuery(Query.empty()).asURI().toString();
this.replacement = forwardedUrl.withPath(forwardedUrl.path().withoutTrailingSlash()).withQuery(Query.empty()).asURI().toString();
}
@Override
public void render(OutputStream outputStream) throws IOException {
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
wrapped.render(buffer);
outputStream.write(buffer.toString(Charset.forName(wrapped.getCharacterEncoding()))
.replace(patten, replacement)
.getBytes(UTF_8));
}
@Override
public String getContentType() {
return wrapped.getContentType();
}
}
}
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