io.gravitee.policy.v3.cache.proxy.CacheProxyConnection Maven / Gradle / Ivy

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/*
 * Copyright © 2015 The Gravitee team (http://gravitee.io)
 *
 * 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.gravitee.policy.v3.cache.proxy;

import io.gravitee.gateway.api.buffer.Buffer;
import io.gravitee.gateway.api.handler.Handler;
import io.gravitee.gateway.api.http.HttpHeaders;
import io.gravitee.gateway.api.proxy.ProxyConnection;
import io.gravitee.gateway.api.proxy.ProxyResponse;
import io.gravitee.gateway.api.stream.ReadStream;
import io.gravitee.policy.cache.CacheResponse;
import java.util.function.Function;
import java.util.stream.Collectors;

/**
 * @author David BRASSELY (david.brassely at graviteesource.com)
 * @author GraviteeSource Team
 */
public class CacheProxyConnection implements ProxyConnection {

    private Handler proxyResponseHandler;
    private final CacheResponse response;

    public CacheProxyConnection(final CacheResponse response) {
        this.response = response;
    }

    @Override
    public ProxyConnection write(Buffer buffer) {
        return this;
    }

    @Override
    public void end() {
        proxyResponseHandler.handle(new CacheProxyResponse(response));
    }

    @Override
    public ProxyConnection responseHandler(Handler responseHandler) {
        this.proxyResponseHandler = responseHandler;
        return this;
    }

    class CacheProxyResponse implements ProxyResponse {

        private Handler bodyHandler;
        private Handler endHandler;

        private final CacheResponse cacheResponse;
        private final HttpHeaders httpHeaders = HttpHeaders.create();

        CacheProxyResponse(final CacheResponse cacheResponse) {
            this.cacheResponse = cacheResponse;
            this.cacheResponse.getHeaders()
                .forEach((s, strings) ->
                    httpHeaders.set(s, strings.stream().map((Function) s1 -> s1).collect(Collectors.toList()))
                );
        }

        @Override
        public int status() {
            return cacheResponse.getStatus();
        }

        @Override
        public HttpHeaders headers() {
            return httpHeaders;
        }

        @Override
        public ProxyResponse bodyHandler(Handler bodyPartHandler) {
            this.bodyHandler = bodyPartHandler;
            return this;
        }

        @Override
        public ProxyResponse endHandler(Handler endHandler) {
            this.endHandler = endHandler;
            return this;
        }

        @Override
        public ReadStream resume() {
            if (cacheResponse.getContent() != null) {
                bodyHandler.handle(cacheResponse.getContent());
            }

            endHandler.handle(null);
            return this;
        }
    }
}