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/*
* ============LICENSE_START====================================
* DCAEGEN2-SERVICES-SDK
* =========================================================
* Copyright (C) 2019 Nokia. All rights reserved.
* =========================================================
* 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.
* ============LICENSE_END=====================================
*/
package org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.impl;
import com.google.gson.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import io.netty.buffer.ByteBuf;
import io.vavr.collection.HashMap;
import java.nio.charset.StandardCharsets;
import java.time.Duration;
import org.jetbrains.annotations.NotNull;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpHeaders;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpMethod;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpRequest;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpResponse;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.ImmutableHttpRequest;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.RequestBody;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.RxHttpClient;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.api.MessageRouterPublisher;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.api.MessageRouterSubscriber;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.ImmutableMessageRouterPublishResponse;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.ImmutableMessageRouterSubscribeResponse;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterPublishRequest;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterPublishResponse;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterSubscribeRequest;
import org.onap.dcaegen2.services.sdk.rest.services.dmaap.client.model.MessageRouterSubscribeResponse;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
/**
* @author <a href="mailto:piotr.jaszczyk@nokia.com">Piotr Jaszczyk</a>
* @since March 2019
*/
// TODO: This is a PoC. It's untested.
public class MessageRouterClientImpl implements MessageRouterPublisher, MessageRouterSubscriber {
private static final Duration WINDOW_MAX_TIME = Duration.ofSeconds(1);
private static final int WINDOW_MAX_SIZE = 512;
private final RxHttpClient httpClient;
private final Gson gson;
public MessageRouterClientImpl(RxHttpClient httpClient, Gson gson) {
this.httpClient = httpClient;
this.gson = gson;
}
@Override
public Flux<MessageRouterPublishResponse> put(
MessageRouterPublishRequest request,
Flux<? extends JsonElement> items) {
return items.windowTimeout(WINDOW_MAX_SIZE, WINDOW_MAX_TIME).flatMap(subItems ->
subItems.collect(JsonArray::new, JsonArray::add)
.filter(arr -> arr.size() > 0)
.map(RequestBody::fromJson)
.flatMap(body -> httpClient.call(buildPostHttpRequest(request, body)))
.map(this::buildPutResponse));
}
@Override
public Mono<MessageRouterSubscribeResponse> get(MessageRouterSubscribeRequest request) {
return httpClient.call(buildGetHttpRequest(request)).map(this::buildGetResponse);
}
private @NotNull MessageRouterPublishResponse buildPutResponse(HttpResponse httpResponse) {
final ImmutableMessageRouterPublishResponse.Builder builder =
ImmutableMessageRouterPublishResponse.builder();
return httpResponse.successful()
? builder.build()
: builder.failReason(extractFailReason(httpResponse)).build();
}
private @NotNull MessageRouterSubscribeResponse buildGetResponse(HttpResponse httpResponse) {
final ImmutableMessageRouterSubscribeResponse.Builder builder =
ImmutableMessageRouterSubscribeResponse.builder();
return httpResponse.successful()
? builder.items(httpResponse.bodyAsJson(StandardCharsets.UTF_8, gson, JsonArray.class)).build()
: builder.failReason(extractFailReason(httpResponse)).build();
}
private String extractFailReason(HttpResponse httpResponse) {
return String.format("%d %s%n%s", httpResponse.statusCode(), httpResponse.statusReason(),
httpResponse.bodyAsString());
}
private @NotNull HttpRequest buildPostHttpRequest(MessageRouterPublishRequest request, RequestBody body) {
return ImmutableHttpRequest.builder()
.method(HttpMethod.POST)
.url(request.sinkDefinition().topicUrl())
.diagnosticContext(request.diagnosticContext())
.customHeaders(HashMap.of(HttpHeaders.CONTENT_TYPE, request.contentType()))
.body(body)
.build();
}
private @NotNull HttpRequest buildGetHttpRequest(MessageRouterSubscribeRequest request) {
return ImmutableHttpRequest.builder()
.method(HttpMethod.GET)
.url(buildSubscribeUrl(request))
.diagnosticContext(request.diagnosticContext())
.build();
}
private String buildSubscribeUrl(MessageRouterSubscribeRequest request) {
return String.format("%s/%s/%s", request.sourceDefinition().topicUrl(), request.consumerGroup(), request.consumerId());
}
}
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