Adds new conformance/client module

- This contains the new conformance client, for the new conformance tests
- The base module has all of the logic and uses the Java Lite runtime (since
  it is lowest common denominator)
- There are google-java and google-javalite modules which have the main
  functions for running the clients. The google-java module swaps out the
  javalite runtime for the java runtime. The client module (with shared logic)
  can convert from javalite generated messages to java generated messages by
  serializing and deserializing
- The adapt package in the client module provides a glimpse of what I think
  better stream APIs would look like. I'd like to update the actual stream
  interfaces to more closely match this in the future. For now, the code just
  adapts exising interfaces to these.
- To test the different unary invocation styles, there is an enum for each
  style and a method in UnaryClient that is an adapter: a single interface for
  the actual conformance client to use (that looks like the Callback style), but
  under the hood it will call the suspend, callback, or blocking methods based
  on the desired invocation style.
- The actual client logic is TODO, in various handle* methods of the Client
  class. This felt like a big enough chunk already, so I figured it would be
  good to get this reviewed before plowing through the rest.

Makefile

@@ -74,6 +74,8 @@ generate: $(PROTOC) buildplugin generateconformance generateexamples ## Generate
 .PHONY: generateconformance
 generateconformance: $(PROTOC) buildplugin ## Generate protofiles for conformance tests.
 	buf generate --template conformance/buf.gen.yaml -o conformance conformance/proto
+	buf generate --template conformance/client/buf.gen.yaml -o conformance/client buf.build/connectrpc/conformance:v1.0.0-rc1
+	buf generate --template conformance/client/buf.gen.lite.yaml -o conformance/client buf.build/connectrpc/conformance:v1.0.0-rc1
 
 .PHONY: generateexamples
 generateexamples: $(PROTOC) buildplugin ## Generate proto files for example apps.

conformance/client/buf.gen.lite.yaml

@@ -0,0 +1,20 @@
+version: v1
+managed:
+  enabled: true
+  java_package_prefix: com.connectrpc.lite
+plugins:
+  - plugin: connect-kotlin
+    out: build/generated/sources/bufgen
+    path: ./protoc-gen-connect-kotlin/build/install/protoc-gen-connect-kotlin/bin/protoc-gen-connect-kotlin
+    opt:
+      - generateCallbackMethods=true
+      - generateCoroutineMethods=true
+      - generateBlockingUnaryMethods=true
+  - plugin: java
+    out: build/generated/sources/bufgen
+    protoc_path: .tmp/bin/protoc
+    opt: lite
+  - plugin: kotlin
+    out: build/generated/sources/bufgen
+    protoc_path: .tmp/bin/protoc
+    opt: lite

conformance/client/buf.gen.yaml

@@ -0,0 +1,17 @@
+version: v1
+managed:
+  enabled: true
+plugins:
+  - plugin: connect-kotlin
+    out: google-java/build/generated/sources/bufgen
+    path: ./protoc-gen-connect-kotlin/build/install/protoc-gen-connect-kotlin/bin/protoc-gen-connect-kotlin
+    opt:
+      - generateCallbackMethods=true
+      - generateCoroutineMethods=true
+      - generateBlockingUnaryMethods=true
+  - plugin: java
+    out: google-java/build/generated/sources/bufgen
+    protoc_path: .tmp/bin/protoc
+  - plugin: kotlin
+    out: google-java/build/generated/sources/bufgen
+    protoc_path: .tmp/bin/protoc

conformance/client/build.gradle.kts

@@ -0,0 +1,30 @@
+plugins {
+    kotlin("jvm")
+}
+
+// This base project contains generated code for the lite runtime
+// and depends on the Google Protobuf Java Lite runtime.
+// The main client logic is implemented in terms of generated
+// code for that lite runtime.
+//
+// The non-lite runtime excludes the Google Protobuf Java Lite
+// runtime and instead uses the full Java runtime. It then can
+// adapt from the lite-runtime-generated code by serializing to
+// bytes and then de-serializing into non-lite-generated types.
+
+sourceSets {
+    main {
+        java {
+            srcDir("build/generated/sources/bufgen")
+        }
+    }
+}
+
+dependencies {
+    implementation(project(":okhttp"))
+    implementation(libs.kotlin.coroutines.core)
+    implementation(libs.protobuf.kotlin)
+    implementation(libs.protobuf.javalite)
+    implementation(libs.okio.core)
+    implementation(libs.okhttp.tls)
+}

conformance/client/google-java/build.gradle.kts

@@ -0,0 +1,35 @@
+plugins {
+    kotlin("jvm")
+}
+
+tasks {
+    compileKotlin {
+        kotlinOptions {
+            // Generated Kotlin code for protobufs uses OptIn annotation
+            freeCompilerArgs += "-opt-in=kotlin.RequiresOptIn"
+        }
+    }
+}
+
+// This project contains an alternate copy of the generated
+// types, generated for the non-lite runtime.
+sourceSets {
+    main {
+        java {
+            srcDir("build/generated/sources/bufgen")
+        }
+    }
+}
+
+dependencies {
+    implementation(project(":conformance:client")) {
+        exclude(group = "com.google.protobuf", module = "protobuf-javalite")
+    }
+    implementation(project(":extensions:google-java"))
+    implementation(project(":okhttp"))
+    implementation(libs.kotlin.coroutines.core)
+    implementation(libs.protobuf.kotlin)
+    implementation(libs.protobuf.java)
+    implementation(libs.okio.core)
+    implementation(libs.okhttp.tls)
+}

conformance/client/google-java/src/main/kotlin/com/connectrpc/conformance/client/java/JavaBidiStreamClient.kt

@@ -0,0 +1,32 @@
+// Copyright 2022-2023 The Connect Authors
+//
+// 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 com.connectrpc.conformance.client.java
+
+import com.connectrpc.Headers
+import com.connectrpc.conformance.client.adapt.BidiStreamClient
+import com.connectrpc.conformance.v1.BidiStreamRequest
+import com.connectrpc.conformance.v1.BidiStreamResponse
+import com.connectrpc.conformance.v1.ConformanceServiceClient
+
+class JavaBidiStreamClient(
+    private val client: ConformanceServiceClient,
+) : BidiStreamClient<BidiStreamRequest, BidiStreamResponse>(
+    BidiStreamRequest.getDefaultInstance(),
+    BidiStreamResponse.getDefaultInstance(),
+) {
+    override suspend fun execute(headers: Headers): BidiStream<BidiStreamRequest, BidiStreamResponse> {
+        return BidiStream.new(client.bidiStream(headers))
+    }
+}

conformance/client/google-java/src/main/kotlin/com/connectrpc/conformance/client/java/JavaClientStreamClient.kt

@@ -0,0 +1,32 @@
+// Copyright 2022-2023 The Connect Authors
+//
+// 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 com.connectrpc.conformance.client.java
+
+import com.connectrpc.Headers
+import com.connectrpc.conformance.client.adapt.ClientStreamClient
+import com.connectrpc.conformance.v1.ClientStreamRequest
+import com.connectrpc.conformance.v1.ClientStreamResponse
+import com.connectrpc.conformance.v1.ConformanceServiceClient
+
+class JavaClientStreamClient(
+    private val client: ConformanceServiceClient,
+) : ClientStreamClient<ClientStreamRequest, ClientStreamResponse>(
+    ClientStreamRequest.getDefaultInstance(),
+    ClientStreamResponse.getDefaultInstance(),
+) {
+    override suspend fun execute(headers: Headers): ClientStream<ClientStreamRequest, ClientStreamResponse> {
+        return ClientStream.new(client.clientStream(headers))
+    }
+}

conformance/client/google-java/src/main/kotlin/com/connectrpc/conformance/client/java/JavaInvoker.kt

@@ -0,0 +1,62 @@
+// Copyright 2022-2023 The Connect Authors
+//
+// 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 com.connectrpc.conformance.client.java
+
+import com.connectrpc.SerializationStrategy
+import com.connectrpc.conformance.client.adapt.BidiStreamClient
+import com.connectrpc.conformance.client.adapt.ClientStreamClient
+import com.connectrpc.conformance.client.adapt.Invoker
+import com.connectrpc.conformance.client.adapt.ServerStreamClient
+import com.connectrpc.conformance.client.adapt.UnaryClient
+import com.connectrpc.conformance.v1.ConformanceServiceClient
+import com.connectrpc.extensions.GoogleJavaJSONStrategy
+import com.connectrpc.extensions.GoogleJavaProtobufStrategy
+import com.connectrpc.impl.ProtocolClient
+import com.connectrpc.lite.connectrpc.conformance.v1.Codec
+
+class JavaInvoker(
+    protocolClient: ProtocolClient,
+) : Invoker {
+    private val client = ConformanceServiceClient(protocolClient)
+    override fun unaryClient(): UnaryClient<*, *> {
+        return JavaUnaryClient(client)
+    }
+
+    override fun unimplementedClient(): UnaryClient<*, *> {
+        return JavaUnimplementedClient(client)
+    }
+
+    override fun clientStreamClient(): ClientStreamClient<*, *> {
+        return JavaClientStreamClient(client)
+    }
+
+    override fun serverStreamClient(): ServerStreamClient<*, *> {
+        return JavaServerStreamClient(client)
+    }
+
+    override fun bidiStreamClient(): BidiStreamClient<*, *> {
+        return JavaBidiStreamClient(client)
+    }
+
+    companion object {
+        fun serializationStrategy(codec: Codec): SerializationStrategy {
+            return when (codec) {
+                Codec.CODEC_PROTO -> GoogleJavaProtobufStrategy()
+                Codec.CODEC_JSON -> GoogleJavaJSONStrategy()
+                else -> throw RuntimeException("unsupported codec $codec")
+            }
+        }
+    }
+}

conformance/client/google-java/src/main/kotlin/com/connectrpc/conformance/client/java/JavaServerStreamClient.kt

@@ -0,0 +1,35 @@
+// Copyright 2022-2023 The Connect Authors
+//
+// 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 com.connectrpc.conformance.client.java
+
+import com.connectrpc.Headers
+import com.connectrpc.conformance.client.adapt.ResponseStream
+import com.connectrpc.conformance.client.adapt.ServerStreamClient
+import com.connectrpc.conformance.v1.ConformanceServiceClient
+import com.connectrpc.conformance.v1.ServerStreamRequest
+import com.connectrpc.conformance.v1.ServerStreamResponse
+
+class JavaServerStreamClient(
+    private val client: ConformanceServiceClient,
+) : ServerStreamClient<ServerStreamRequest, ServerStreamResponse>(
+    ServerStreamRequest.getDefaultInstance(),
+    ServerStreamResponse.getDefaultInstance(),
+) {
+    override suspend fun execute(req: ServerStreamRequest, headers: Headers): ResponseStream<ServerStreamResponse> {
+        val stream = client.serverStream(headers)
+        stream.sendAndClose(req)
+        return ResponseStream.new(stream)
+    }
+}

conformance/client/google-java/src/main/kotlin/com/connectrpc/conformance/client/java/JavaUnaryClient.kt

@@ -0,0 +1,47 @@
+// Copyright 2022-2023 The Connect Authors
+//
+// 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 com.connectrpc.conformance.client.java
+
+import com.connectrpc.Headers
+import com.connectrpc.ResponseMessage
+import com.connectrpc.UnaryBlockingCall
+import com.connectrpc.conformance.client.adapt.UnaryClient
+import com.connectrpc.conformance.v1.ConformanceServiceClient
+import com.connectrpc.conformance.v1.UnaryRequest
+import com.connectrpc.conformance.v1.UnaryResponse
+import com.connectrpc.http.Cancelable
+
+class JavaUnaryClient(
+    private val client: ConformanceServiceClient,
+) : UnaryClient<UnaryRequest, UnaryResponse>(
+    UnaryRequest.getDefaultInstance(),
+    UnaryResponse.getDefaultInstance(),
+) {
+    override suspend fun execute(req: UnaryRequest, headers: Headers): ResponseMessage<UnaryResponse> {
+        return client.unary(req, headers)
+    }
+
+    override fun execute(
+        req: UnaryRequest,
+        headers: Headers,
+        onFinish: (ResponseMessage<UnaryResponse>) -> Unit,
+    ): Cancelable {
+        return client.unary(req, headers, onFinish)
+    }
+
+    override fun blocking(req: UnaryRequest, headers: Headers): UnaryBlockingCall<UnaryResponse> {
+        return client.unaryBlocking(req, headers)
+    }
+}

conformance/client/google-java/src/main/kotlin/com/connectrpc/conformance/client/java/JavaUnimplementedClient.kt

@@ -0,0 +1,47 @@
+// Copyright 2022-2023 The Connect Authors
+//
+// 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 com.connectrpc.conformance.client.java
+
+import com.connectrpc.Headers
+import com.connectrpc.ResponseMessage
+import com.connectrpc.UnaryBlockingCall
+import com.connectrpc.conformance.client.adapt.UnaryClient
+import com.connectrpc.conformance.v1.ConformanceServiceClient
+import com.connectrpc.conformance.v1.UnimplementedRequest
+import com.connectrpc.conformance.v1.UnimplementedResponse
+import com.connectrpc.http.Cancelable
+
+class JavaUnimplementedClient(
+    private val client: ConformanceServiceClient,
+) : UnaryClient<UnimplementedRequest, UnimplementedResponse>(
+    UnimplementedRequest.getDefaultInstance(),
+    UnimplementedResponse.getDefaultInstance(),
+) {
+    override suspend fun execute(req: UnimplementedRequest, headers: Headers): ResponseMessage<UnimplementedResponse> {
+        return client.unimplemented(req, headers)
+    }
+
+    override fun execute(
+        req: UnimplementedRequest,
+        headers: Headers,
+        onFinish: (ResponseMessage<UnimplementedResponse>) -> Unit,
+    ): Cancelable {
+        return client.unimplemented(req, headers, onFinish)
+    }
+
+    override fun blocking(req: UnimplementedRequest, headers: Headers): UnaryBlockingCall<UnimplementedResponse> {
+        return client.unimplementedBlocking(req, headers)
+    }
+}

conformance/client/google-java/src/main/kotlin/com/connectrpc/conformance/client/java/Main.kt

@@ -0,0 +1,19 @@
+package com.connectrpc.conformance.client.java
+
+import com.connectrpc.conformance.client.Client
+import com.connectrpc.conformance.client.ConformanceClientLoop
+
+fun main(args: Array<String>) {
+    try {
+        val invokeStyle = ConformanceClientLoop.parseArgs(args)
+        val client = Client(
+            invokerFactory = ::JavaInvoker,
+            serializationFactory = JavaInvoker::serializationStrategy,
+            invokeStyle = invokeStyle,
+        )
+        ConformanceClientLoop.run(System.`in`, System.out, client)
+    } catch (e: Exception) {
+        e.printStackTrace(System.err)
+        Runtime.getRuntime().exit(1)
+    }
+}