FilterStreamMessageTest.java

/*
 * Copyright 2023 LINE Corporation
 *
 * LINE Corporation licenses this file to you 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:
 *
 *   https://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 com.linecorp.armeria;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.RegisterExtension;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.linecorp.armeria.client.WebClient;
import com.linecorp.armeria.common.AggregatedHttpResponse;
import com.linecorp.armeria.common.FilteredHttpResponse;
import com.linecorp.armeria.common.HttpData;
import com.linecorp.armeria.common.HttpObject;
import com.linecorp.armeria.common.HttpResponse;
import com.linecorp.armeria.common.HttpResponseWriter;
import com.linecorp.armeria.common.ResponseHeaders;
import com.linecorp.armeria.server.ServerBuilder;
import com.linecorp.armeria.testing.junit5.server.ServerExtension;

class FilterStreamMessageTest {
    @RegisterExtension
    static final ServerExtension server = new ServerExtension() {
        @Override
        protected void configure(ServerBuilder sb) {
            sb.service("/", (ctx, req) -> {

                final HttpResponseWriter streaming = HttpResponse.streaming();
                streaming.write(ResponseHeaders.of(200));
                streaming.write(HttpData.ofUtf8("{"));
                streaming.whenConsumed().thenAccept(v -> {
                    streaming.write(HttpData.ofUtf8("\"foo\": \"bar\""));
                    streaming.whenConsumed().thenAccept(v2 -> {
                        streaming.write(HttpData.ofUtf8("}"));
                        streaming.close();
                    });
                });
                return streaming;
            });
        }
    };

    private static final Logger logger = LoggerFactory.getLogger(FilterStreamMessageTest.class);

    @Test
    void test() {
        final WebClient client =
                WebClient.builder(server.httpUri())
                         .decorator((delegate, ctx, req) -> {
                             final HttpResponse response = delegate.execute(ctx, req);
                             return new FilteredHttpResponse(response) {

                                 @Override
                                 protected HttpObject filter(HttpObject obj) {
                                     if (obj instanceof HttpData) {
                                         logger.debug("data: {}", ((HttpData) obj).toStringUtf8());
                                     }
                                     return obj;
                                 }
                             };
                         })
                         .build();
        final AggregatedHttpResponse response = client.get("/").aggregate().join();
    }

}