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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.clustercontroller.core.status.statuspage;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Shows status pages with debug information through a very simple HTTP interface.
*/
public class StatusPageServer {
public static Logger log = Logger.getLogger(StatusPageServer.class.getName());
/**
* Very simple HTTP request class. This should be replaced the second
* the fleetcontroller e.g. moves into the container.
*/
public static class HttpRequest {
private final String request;
private final String path;
static Pattern pathPattern;
static {
// NOTE: allow [=.] in path to be backwards-compatible with legacy node
// status pages.
// If you stare at it for long enough, this sorta looks like one of those
// magic eye pictures.
pathPattern = Pattern.compile("^(/([\\w=./]+)?)(?:\\?((?:&?\\w+(?:=[\\w.]*)?)*))?$");
}
public HttpRequest(String request) {
this.request = request;
Matcher m = pathPattern.matcher(request);
if (!m.matches()) {
throw new IllegalArgumentException("Illegal HTTP request path: " + request);
}
path = m.group(1);
}
public String toString() {
return "HttpRequest(" + request + ")";
}
public String getRequest() {
return request;
}
public String getPath() {
return path;
}
}
public interface RequestHandler {
StatusPageResponse handle(HttpRequest request);
String pattern();
}
public interface RequestRouter {
/**
* Resolve a request's handler based on its path.
* @param request HTTP request to resolve for.
* @return the request handler, or null if none matched.
*/
RequestHandler resolveHandler(HttpRequest request);
}
/**
* Request router inspired by the Django framework's regular expression
* based approach. Patterns are matched in the same order as they were
* added to the router and the first matching one is used as the handler.
*/
public static class PatternRequestRouter implements RequestRouter {
private static class PatternRouting {
public Pattern pattern;
public RequestHandler handler;
private PatternRouting(Pattern pattern, RequestHandler handler) {
this.pattern = pattern;
this.handler = handler;
}
}
private final List<PatternRouting> patterns = new ArrayList<>();
public void addHandler(RequestHandler handler) {
patterns.add(new PatternRouting(Pattern.compile(handler.pattern()), handler));
}
@Override
public RequestHandler resolveHandler(HttpRequest request) {
for (PatternRouting routing : patterns) {
Matcher m = routing.pattern.matcher(request.getPath());
if (m.matches()) {
return routing.handler;
}
}
return null;
}
}
}
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