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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.clustercontroller.utils.test;
import com.yahoo.vespa.clustercontroller.utils.communication.async.AsyncOperation;
import com.yahoo.vespa.clustercontroller.utils.communication.async.AsyncOperationImpl;
import com.yahoo.vespa.clustercontroller.utils.communication.http.HttpRequest;
import com.yahoo.vespa.clustercontroller.utils.communication.http.HttpRequestHandler;
import com.yahoo.vespa.clustercontroller.utils.communication.http.HttpResult;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* This class is a utility for unit tests.. You can register HttpRequestHandler instances in it, and then
* you can extract an AsyncHttpClient<HttpResult> instance from it, which you can use to talk to the
* registered servers. Thus you can do end to end testing of components talking over HTTP without actually
* going through HTTP if you are using the HTTP abstraction layer in communication.http package.
*/
public class TestTransport {
private static final Logger log = Logger.getLogger(TestTransport.class.getName());
private static class Handler {
final HttpRequestHandler handler;
final String pathPrefix;
Handler(HttpRequestHandler h, String prefix) { this.handler = h; this.pathPrefix = prefix; }
}
private static class Socket {
public final String hostname;
public final int port;
Socket(String hostname, int port) {
this.hostname = hostname;
this.port = port;
}
@Override
public boolean equals(Object o) {
if (!(o instanceof Socket other)) return false;
return (hostname.equals(other.hostname) && port == other.port);
}
@Override
public int hashCode() {
return hostname.hashCode() * port;
}
}
private static class Request {
public final HttpRequest request;
public final AsyncOperationImpl<HttpResult> result;
Request(HttpRequest r, AsyncOperationImpl<HttpResult> rr) {
this.request = r;
this.result = rr;
}
}
private final Map<Socket, List<Handler>> handlers = new HashMap<>();
private final LinkedList<Request> requests = new LinkedList<>();
private final AsyncHttpClient<HttpResult> client = new AsyncHttpClient<>() {
@Override
public AsyncOperation<HttpResult> execute(HttpRequest r) {
log.fine("Queueing request " + r);
if (r.getHttpOperation() == null) {
r = r.clone();
r.setHttpOperation(r.getPostContent() == null ? HttpRequest.HttpOp.GET : HttpRequest.HttpOp.POST);
}
r.verifyComplete();
AsyncOperationImpl<HttpResult> op = new AsyncOperationImpl<>(r.toString());
synchronized (requests) {
requests.addLast(new Request(r, op));
}
return op;
}
@Override
public void close() { TestTransport.this.close(); }
};
private boolean running = true;
private final Thread workerThread = new Thread() {
@Override
public void run() {
while (running) {
synchronized (requests) {
if (requests.isEmpty()) {
try {
requests.wait(100);
} catch (InterruptedException e) { return; }
} else {
Request request = requests.removeFirst();
HttpRequest r = request.request;
log.fine("Processing request " + r);
HttpRequestHandler handler = getHandler(r);
if (handler == null) {
if (log.isLoggable(Level.FINE)) {
log.fine("Failed to find target for request " + r.toString(true));
log.fine("Existing handlers:");
for (Socket socket : handlers.keySet()) {
log.fine(" Socket " + socket.hostname + ":" + socket.port);
for (Handler h : handlers.get(socket)) {
log.fine(" " + h.pathPrefix);
}
}
}
request.result.setResult(new HttpResult().setHttpCode(
404, "No such server socket with suitable path prefix found open"));
} else {
try{
request.result.setResult(handler.handleRequest(r));
} catch (Exception e) {
HttpResult result = new HttpResult().setHttpCode(500, e.getMessage());
StringWriter sw = new StringWriter();
e.printStackTrace(new PrintWriter(sw));
result.setContent(sw.toString());
request.result.setResult(result);
}
}
//log.fine("Request " + r.toString(true) + " created result " + request.getSecond().getResult().toString(true));
}
}
}
}
};
public TestTransport() {
workerThread.start();
}
public void close() {
if (!running) return;
running = false;
synchronized (requests) { requests.notifyAll(); }
try {
workerThread.join();
} catch (InterruptedException e) {}
}
/** Get an HTTP client that talks to this test transport layer. */
public AsyncHttpClient<HttpResult> getClient() { return client; }
private HttpRequestHandler getHandler(HttpRequest r) {
Socket socket = new Socket(r.getHost(), r.getPort());
synchronized (this) {
List<Handler> handlerList = handlers.get(socket);
if (handlerList == null) {
log.fine("No socket match");
return null;
}
log.fine("Socket found");
for (Handler h : handlers.get(socket)) {
if (r.getPath().length() >= h.pathPrefix.length() && r.getPath().startsWith(h.pathPrefix)) {
return h.handler;
}
}
log.fine("No path prefix match");
}
return null;
}
public void addServer(HttpRequestHandler server, String hostname, int port, String pathPrefix) {
Socket socket = new Socket(hostname, port);
synchronized (this) {
List<Handler> shandlers = handlers.get(socket);
if (shandlers == null) {
shandlers = new LinkedList<>();
handlers.put(socket, shandlers);
}
shandlers.add(new Handler(server, pathPrefix));
}
}
}
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