| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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 |
| * |
| * 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 org.apache.flink.statefun.flink.core.httpfn; |
| |
| import static org.apache.flink.statefun.flink.core.common.PolyglotUtil.parseProtobufOrThrow; |
| import static org.apache.flink.util.Preconditions.checkState; |
| |
| import java.io.InputStream; |
| import java.util.Objects; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.function.BooleanSupplier; |
| import okhttp3.Call; |
| import okhttp3.HttpUrl; |
| import okhttp3.MediaType; |
| import okhttp3.OkHttpClient; |
| import okhttp3.Request; |
| import okhttp3.RequestBody; |
| import okhttp3.Response; |
| import org.apache.flink.statefun.flink.core.metrics.RemoteInvocationMetrics; |
| import org.apache.flink.statefun.flink.core.polyglot.generated.FromFunction; |
| import org.apache.flink.statefun.flink.core.polyglot.generated.ToFunction; |
| import org.apache.flink.statefun.flink.core.reqreply.RequestReplyClient; |
| import org.apache.flink.statefun.flink.core.reqreply.ToFunctionRequestSummary; |
| import org.apache.flink.util.IOUtils; |
| |
| final class HttpRequestReplyClient implements RequestReplyClient { |
| private static final MediaType MEDIA_TYPE_BINARY = MediaType.parse("application/octet-stream"); |
| |
| private final HttpUrl url; |
| private final OkHttpClient client; |
| private final BooleanSupplier isShutdown; |
| |
| HttpRequestReplyClient(HttpUrl url, OkHttpClient client, BooleanSupplier isShutdown) { |
| this.url = Objects.requireNonNull(url); |
| this.client = Objects.requireNonNull(client); |
| this.isShutdown = Objects.requireNonNull(isShutdown); |
| } |
| |
| @Override |
| public CompletableFuture<FromFunction> call( |
| ToFunctionRequestSummary requestSummary, |
| RemoteInvocationMetrics metrics, |
| ToFunction toFunction) { |
| Request request = |
| new Request.Builder() |
| .url(url) |
| .post(RequestBody.create(MEDIA_TYPE_BINARY, toFunction.toByteArray())) |
| .build(); |
| |
| Call newCall = client.newCall(request); |
| RetryingCallback callback = |
| new RetryingCallback(requestSummary, metrics, newCall.timeout(), isShutdown); |
| callback.attachToCall(newCall); |
| return callback.future().thenApply(HttpRequestReplyClient::parseResponse); |
| } |
| |
| private static FromFunction parseResponse(Response response) { |
| final InputStream httpResponseBody = responseBody(response); |
| try { |
| FromFunction fromFunction = parseProtobufOrThrow(FromFunction.parser(), httpResponseBody); |
| if (fromFunction.hasInvocationResult()) { |
| return fromFunction; |
| } |
| return FromFunction.getDefaultInstance(); |
| } finally { |
| IOUtils.closeQuietly(httpResponseBody); |
| } |
| } |
| |
| private static InputStream responseBody(Response httpResponse) { |
| checkState(httpResponse.isSuccessful(), "Unexpected HTTP status code %s", httpResponse.code()); |
| checkState(httpResponse.body() != null, "Unexpected empty HTTP response (no body)"); |
| checkState( |
| Objects.equals(httpResponse.body().contentType(), MEDIA_TYPE_BINARY), |
| "Wrong HTTP content-type %s", |
| httpResponse.body().contentType()); |
| return httpResponse.body().byteStream(); |
| } |
| } |