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Adds documentation for gRPC Client in SE. (#9440)
Signed-off-by: Santiago Pericas-Geertsen <santiago.pericasgeertsen@oracle.com>
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docs/src/main/java/io/helidon/docs/se/grpc/ClientSnippets.java
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| /* | ||
| * Copyright (c) 2024 Oracle and/or its affiliates. | ||
| * | ||
| * 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.helidon.docs.se.grpc; | ||
|
|
||
| import java.util.List; | ||
| import java.util.ArrayList; | ||
| import java.util.Iterator; | ||
| import java.util.concurrent.CompletableFuture; | ||
| import io.helidon.common.configurable.Resource; | ||
| import io.helidon.common.tls.Tls; | ||
| import io.helidon.config.Config; | ||
| import io.helidon.webclient.api.WebClient; | ||
| import io.helidon.webclient.api.ClientUri; | ||
| import io.helidon.webclient.grpc.GrpcClient; | ||
| import io.helidon.webserver.WebServer; | ||
| import io.helidon.webserver.grpc.GrpcRouting; | ||
| import io.helidon.webserver.grpc.GrpcService; | ||
| import io.helidon.webclient.grpc.GrpcServiceDescriptor; | ||
| import io.helidon.webclient.grpc.GrpcClientMethodDescriptor; | ||
| import io.helidon.webclient.grpc.ClientUriSupplier; | ||
| import io.helidon.webclient.grpc.ClientUriSuppliers.RoundRobinSupplier; | ||
|
|
||
| import com.google.protobuf.Descriptors; | ||
| import io.grpc.Channel; | ||
| import io.grpc.stub.StreamObserver; | ||
| import io.grpc.ClientInterceptor; | ||
|
|
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| import static io.helidon.grpc.core.ResponseHelper.complete; | ||
|
|
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| @SuppressWarnings("ALL") | ||
| class ClientSnippets { | ||
|
|
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| class StringServiceGrpc { | ||
|
|
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| class StringServiceBlockingStub { | ||
| Strings.StringMessage upper(Strings.StringMessage msg) { | ||
| return null; | ||
| } | ||
| Iterator<Strings.StringMessage> split(Strings.StringMessage msg) { | ||
| return null; | ||
| } | ||
| void split(Strings.StringMessage msg, StreamObserver<?> observer) { | ||
| } | ||
| } | ||
|
|
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| static StringServiceGrpc.StringServiceBlockingStub newBlockingStub(Channel c) { | ||
| return null; | ||
| } | ||
| } | ||
|
|
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| class Strings { | ||
|
|
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| class StringMessage { | ||
| String getText() { | ||
| return null; | ||
| } | ||
| } | ||
| } | ||
|
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| Strings.StringMessage newMessage(String s) { | ||
| return null; | ||
| } | ||
|
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| ClientUri[] myServers() { | ||
| return null; | ||
| } | ||
|
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| List<ClientInterceptor> myInterceptors() { | ||
| return null; | ||
| } | ||
|
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| void snippets() { | ||
| // tag::snippet_1[] | ||
| Tls clientTls = Tls.builder() | ||
| .trust(trust -> trust | ||
| .keystore(store -> store | ||
| .passphrase("password") | ||
| .trustStore(true) | ||
| .keystore(Resource.create("client.p12")))) | ||
| .build(); | ||
| // end::snippet_1[] | ||
|
|
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| // tag::snippet_2[] | ||
| WebClient webClient = WebClient.builder() | ||
| .tls(clientTls) | ||
| .baseUri("https://localhost:8080") | ||
| .build(); | ||
| // end::snippet_2[] | ||
|
|
||
| // tag::snippet_3[] | ||
| GrpcClient grpcClient = webClient.client(GrpcClient.PROTOCOL); | ||
| StringServiceGrpc.StringServiceBlockingStub service = | ||
| StringServiceGrpc.newBlockingStub(grpcClient.channel()); | ||
| // end::snippet_3[] | ||
|
|
||
| // tag::snippet_4[] | ||
| Strings.StringMessage msg1 = newMessage("hello"); | ||
| Strings.StringMessage res1 = service.upper(msg1); | ||
| String uppercased = res1.getText(); | ||
| // end::snippet_4[] | ||
|
|
||
| // tag::snippet_5[] | ||
| Strings.StringMessage msg2 = newMessage("hello world"); | ||
| Iterator<Strings.StringMessage> res2 = service.split(msg2); | ||
| while (res2.hasNext()) { | ||
| // ... | ||
| } | ||
| // end::snippet_5[] | ||
|
|
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| // tag::snippet_6[] | ||
| Strings.StringMessage msg3 = newMessage("hello world"); | ||
| CompletableFuture<Iterator<Strings.StringMessage>> future = new CompletableFuture<>(); | ||
| service.split(msg3, new StreamObserver<Strings.StringMessage>() { | ||
| private final List<Strings.StringMessage> value = new ArrayList<>(); | ||
|
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| @Override | ||
| public void onNext(Strings.StringMessage value) { | ||
| this.value.add(value); | ||
| } | ||
|
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| @Override | ||
| public void onError(Throwable t) { | ||
| future.completeExceptionally(t); | ||
| } | ||
|
|
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| @Override | ||
| public void onCompleted() { | ||
| future.complete(value.iterator()); | ||
| } | ||
| }); | ||
| // end::snippet_6[] | ||
|
|
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| // tag::snippet_7[] | ||
| GrpcServiceDescriptor serviceDescriptor = GrpcServiceDescriptor.builder() | ||
| .serviceName("StringService") | ||
| .putMethod("Upper", | ||
| GrpcClientMethodDescriptor.unary("StringService", "Upper") | ||
| .requestType(Strings.StringMessage.class) | ||
| .responseType(Strings.StringMessage.class) | ||
| .build()) | ||
| .putMethod("Split", | ||
| GrpcClientMethodDescriptor.serverStreaming("StringService", "Split") | ||
| .requestType(Strings.StringMessage.class) | ||
| .responseType(Strings.StringMessage.class) | ||
| .build()) | ||
| .build(); | ||
| // end::snippet_7[] | ||
|
|
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| // tag::snippet_8[] | ||
| Strings.StringMessage res = grpcClient.serviceClient(serviceDescriptor) | ||
| .unary("Upper", newMessage("hello")); | ||
| // end::snippet_8[] | ||
|
|
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| } | ||
|
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| void snippets2() { | ||
| Tls clientTls = Tls.builder() | ||
| .trust(trust -> trust | ||
| .keystore(store -> store | ||
| .passphrase("password") | ||
| .trustStore(true) | ||
| .keystore(Resource.create("client.p12")))) | ||
| .build(); | ||
|
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| // tag::snippet_9[] | ||
| GrpcClient grpcClient = GrpcClient.builder() | ||
| .tls(clientTls) | ||
| .clientUriSupplier(RoundRobinSupplier.create(myServers())) | ||
| .build(); | ||
| // end::snippet_9[] | ||
|
|
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| // tag::snippet_10[] | ||
| Channel newChannel = grpcClient.channel(myInterceptors()); | ||
| // end::snippet_10[] | ||
| } | ||
| } |