io.undertow.server.handlers.ResponseRateLimitingHandler Maven / Gradle / Ivy
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* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.undertow.server.handlers;
import io.undertow.conduits.RateLimitingStreamSinkConduit;
import io.undertow.server.ConduitWrapper;
import io.undertow.server.HandlerWrapper;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.server.handlers.builder.HandlerBuilder;
import io.undertow.util.ConduitFactory;
import org.xnio.conduits.StreamSinkConduit;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
/**
* Handler that limits the download rate
*
* @author Stuart Douglas
*/
public class ResponseRateLimitingHandler implements HttpHandler {
private final long time;
private final int bytes;
private final HttpHandler next;
private final ConduitWrapper WRAPPER = new ConduitWrapper() {
@Override
public StreamSinkConduit wrap(ConduitFactory factory, HttpServerExchange exchange) {
return new RateLimitingStreamSinkConduit(factory.create(), bytes, time, TimeUnit.MILLISECONDS);
}
};
/**
*
* A handler that limits the download speed to a set number of bytes/period
*
* @param next The next handler
* @param bytes The number of bytes per time period
* @param time The time period
* @param timeUnit The units of the time period
*/
public ResponseRateLimitingHandler(HttpHandler next, int bytes,long time, TimeUnit timeUnit) {
this.time = timeUnit.toMillis(time);
this.bytes = bytes;
this.next = next;
}
@Override
public void handleRequest(HttpServerExchange exchange) throws Exception {
exchange.addResponseWrapper(WRAPPER);
next.handleRequest(exchange);
}
@Override
public String toString() {
return "response-rate-limit( bytes=" + bytes + ", time=" + time + " )";
}
public static class Builder implements HandlerBuilder {
@Override
public String name() {
return "response-rate-limit";
}
@Override
public Map> parameters() {
Map> ret = new HashMap<>();
ret.put("bytes", Integer.class);
ret.put("time", Long.class);
return ret;
}
@Override
public Set requiredParameters() {
return new HashSet<>(Arrays.asList("bytes", "time"));
}
@Override
public String defaultParameter() {
return null;
}
@Override
public HandlerWrapper build(Map config) {
return new Wrapper((Integer)config.get("bytes"), (Long)config.get("time"), TimeUnit.MILLISECONDS);
}
}
private static class Wrapper implements HandlerWrapper {
private final long time;
private final int bytes;
private Wrapper(int bytes, long time, TimeUnit timeUnit) {
this.time = timeUnit.toMillis(time);
this.bytes = bytes;
}
@Override
public HttpHandler wrap(HttpHandler handler) {
return new ResponseRateLimitingHandler(handler, bytes, time, TimeUnit.MILLISECONDS);
}
}
}