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mtdowlingmtdowling
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Add virtual-thread-based HTTP client
Adds a blocking HTTP client built for virtual threads with an HTTP/1.1 and HTTP/2 implementations, connection pooling, flow control, HPACK encoding/decoding, and comprehensive test coverage including fuzz tests.
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Lines changed: 169861 additions & 311 deletions

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‎.github/workflows/fuzz-testing.yml‎

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run: |
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./gradlew :client:client-rulesengine:test --tests "*FuzzTest*" -Djazzer.max_duration=1h --stacktrace
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- name: Run HPACK fuzz tests
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env:
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JAZZER_FUZZ: "1"
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run: |
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./gradlew :http:http-hpack:test --tests "*FuzzTest*" -Djazzer.max_duration=1h --stacktrace
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- name: Run HTTP client fuzz tests
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env:
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JAZZER_FUZZ: "1"
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run: |
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./gradlew :http:http-client:test --tests "*FuzzTest*" -Djazzer.max_duration=1h --stacktrace
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- name: Save fuzz corpus cache
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uses: actions/cache/save@v5
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if: always()

‎.gitignore‎

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# Ignore Gradle project-specific cache directory
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.gradle
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.tool-versions
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# Ignore kotlin cache dir
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.kotlin
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‎buildSrc/src/main/kotlin/smithy-java.java-conventions.gradle.kts‎

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@@ -13,12 +13,6 @@ plugins {
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// Workaround per: https://github.com/gradle/gradle/issues/15383
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val Project.libs get() = the<LibrariesForLibs>()
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java {
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toolchain {
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languageVersion = JavaLanguageVersion.of(21)
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}
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}
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tasks.withType<JavaCompile>() {
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options.encoding = "UTF-8"
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options.release.set(21)
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excludeFilter = file("${project.rootDir}/config/spotbugs/filter.xml")
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}
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// Disable spotbugs tasks to avoid build failures with incompatible JDK versions.
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tasks.withType<com.github.spotbugs.snom.SpotBugsTask>().configureEach {
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enabled = false
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}
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// We don't need to lint tests.
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tasks.named("spotbugsTest") {
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enabled = false

‎buildSrc/src/main/kotlin/smithy-java.module-conventions.gradle.kts‎

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html.outputLocation.set(file("${layout.buildDirectory.get()}/reports/jacoco"))
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}
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}
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// Ensure integ tests are executed as part of test suite
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tasks["test"].finalizedBy("integ")

‎client/client-http-smithy/build.gradle.kts‎

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plugins {
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id("smithy-java.module-conventions")
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}
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description = "Client transport using Smithy's native HTTP client with full HTTP/2 bidirectional streaming"
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extra["displayName"] = "Smithy :: Java :: Client :: HTTP :: Smithy"
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extra["moduleName"] = "software.amazon.smithy.java.client.http.smithy"
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dependencies {
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api(project(":client:client-http"))
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api(project(":http:http-client"))
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implementation(project(":logging"))
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}

‎client/client-http-smithy/src/main/java/software/amazon/smithy/java/client/http/smithy/SmithyHttpClientTransport.java‎

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/*
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* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0
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*/
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package software.amazon.smithy.java.client.http.smithy;
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import java.io.IOException;
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import java.io.OutputStream;
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import software.amazon.smithy.java.client.core.ClientTransport;
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import software.amazon.smithy.java.client.core.ClientTransportFactory;
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import software.amazon.smithy.java.client.core.MessageExchange;
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import software.amazon.smithy.java.client.http.HttpContext;
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import software.amazon.smithy.java.client.http.HttpMessageExchange;
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import software.amazon.smithy.java.context.Context;
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import software.amazon.smithy.java.core.serde.document.Document;
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import software.amazon.smithy.java.http.api.HttpHeaders;
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import software.amazon.smithy.java.http.api.HttpRequest;
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import software.amazon.smithy.java.http.api.HttpResponse;
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import software.amazon.smithy.java.http.client.HttpClient;
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import software.amazon.smithy.java.http.client.HttpExchange;
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import software.amazon.smithy.java.http.client.RequestOptions;
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import software.amazon.smithy.java.http.client.connection.HttpConnectionPool;
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import software.amazon.smithy.java.io.datastream.DataStream;
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import software.amazon.smithy.java.logging.InternalLogger;
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/**
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* A client transport using Smithy's native blocking HTTP client with full HTTP/2 bidirectional streaming.
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*
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* <p>Unlike the JDK-based transport, this transport supports true bidirectional streaming over HTTP/2:
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* the request body can be written concurrently with reading the response body. For HTTP/1.1, the request
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* body is fully sent before the response is returned.
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*/
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public final class SmithyHttpClientTransport implements ClientTransport<HttpRequest, HttpResponse> {
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private static final InternalLogger LOGGER = InternalLogger.getLogger(SmithyHttpClientTransport.class);
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private final HttpClient client;
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/**
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* Create a transport with default settings.
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*/
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public SmithyHttpClientTransport() {
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this(HttpClient.builder().build());
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}
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/**
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* Create a transport with the given HTTP client.
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*
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* @param client the Smithy HTTP client to use
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*/
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public SmithyHttpClientTransport(HttpClient client) {
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this.client = client;
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}
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@Override
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public MessageExchange<HttpRequest, HttpResponse> messageExchange() {
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return HttpMessageExchange.INSTANCE;
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}
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@Override
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public HttpResponse send(Context context, HttpRequest request) {
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try {
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return doSend(context, request);
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} catch (Exception e) {
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throw ClientTransport.remapExceptions(e);
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}
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}
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private HttpResponse doSend(Context context, HttpRequest request) throws Exception {
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var options = RequestOptions.builder()
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.requestTimeout(context.get(HttpContext.HTTP_REQUEST_TIMEOUT))
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.build();
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HttpExchange exchange = client.newExchange(request, options);
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try {
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DataStream requestBody = request.body();
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boolean hasBody = requestBody != null && requestBody.contentLength() != 0;
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if (!hasBody) {
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// Close body right away.
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exchange.requestBody().close();
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} else if (exchange.supportsBidirectionalStreaming()) {
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// H2: write body on a virtual thread so response can stream back concurrently (bidi streaming)
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Thread.startVirtualThread(() -> {
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try (OutputStream out = exchange.requestBody()) {
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requestBody.writeTo(out);
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} catch (IOException e) {
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LOGGER.debug("Error writing request body: {}", e.getMessage());
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}
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});
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} else {
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// H1: write body inline. It must complete before response is available.
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try (OutputStream out = exchange.requestBody()) {
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requestBody.writeTo(out);
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}
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}
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return buildResponse(exchange);
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} catch (Exception e) {
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exchange.close();
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throw e;
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}
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}
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private HttpResponse buildResponse(HttpExchange exchange) throws IOException {
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int statusCode = exchange.responseStatusCode();
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HttpHeaders headers = exchange.responseHeaders();
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var length = headers.contentLength();
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long adaptedLength = length == null ? -1 : length;
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var contentType = headers.contentType();
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// Wrap the response body stream as a DataStream.
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// The exchange auto-closes when both request and response streams are closed.
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var body = DataStream.ofInputStream(exchange.responseBody(), contentType, adaptedLength);
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return HttpResponse.builder()
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.httpVersion(exchange.request().httpVersion())
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.statusCode(statusCode)
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.headers(headers)
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.body(body)
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.build();
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}
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@Override
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public void close() throws IOException {
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client.close();
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}
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public static final class Factory implements ClientTransportFactory<HttpRequest, HttpResponse> {
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@Override
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public String name() {
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return "http-smithy";
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}
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@Override
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public SmithyHttpClientTransport createTransport(Document node, Document pluginSettings) {
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var config = new SmithyHttpTransportConfig().fromDocument(pluginSettings.asStringMap()
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.getOrDefault("httpConfig", Document.EMPTY_MAP));
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config.fromDocument(node);
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var builder = HttpClient.builder();
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var poolBuilder = HttpConnectionPool.builder();
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if (config.requestTimeout() != null) {
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builder.requestTimeout(config.requestTimeout());
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}
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if (config.maxConnections() != null) {
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poolBuilder.maxTotalConnections(config.maxConnections());
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poolBuilder.maxConnectionsPerRoute(config.maxConnections());
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}
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if (config.h2StreamsPerConnection() != null) {
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poolBuilder.h2StreamsPerConnection(config.h2StreamsPerConnection());
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}
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if (config.h2InitialWindowSize() != null) {
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poolBuilder.h2InitialWindowSize(config.h2InitialWindowSize());
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}
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if (config.connectTimeout() != null) {
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poolBuilder.connectTimeout(config.connectTimeout());
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}
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if (config.maxIdleTime() != null) {
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poolBuilder.maxIdleTime(config.maxIdleTime());
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}
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if (config.httpVersionPolicy() != null) {
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poolBuilder.httpVersionPolicy(config.httpVersionPolicy());
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}
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builder.connectionPool(poolBuilder.build());
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return new SmithyHttpClientTransport(builder.build());
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}
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@Override
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public MessageExchange<HttpRequest, HttpResponse> messageExchange() {
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return HttpMessageExchange.INSTANCE;
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}
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}
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}

‎client/client-http-smithy/src/main/java/software/amazon/smithy/java/client/http/smithy/SmithyHttpTransportConfig.java‎

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/*
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* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0
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*/
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package software.amazon.smithy.java.client.http.smithy;
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import java.time.Duration;
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import software.amazon.smithy.java.client.http.HttpTransportConfig;
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import software.amazon.smithy.java.core.serde.document.Document;
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import software.amazon.smithy.java.http.client.connection.HttpVersionPolicy;
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/**
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* Transport configuration for the Smithy HTTP client, extending common settings
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* with connection pool and HTTP/2 tuning options.
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*/
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public final class SmithyHttpTransportConfig extends HttpTransportConfig {
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private Integer maxConnections;
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private Duration maxIdleTime;
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private Integer h2StreamsPerConnection;
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private Integer h2InitialWindowSize;
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private HttpVersionPolicy httpVersionPolicy;
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public Integer maxConnections() {
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return maxConnections;
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}
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public SmithyHttpTransportConfig maxConnections(int maxConnections) {
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this.maxConnections = maxConnections;
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return this;
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}
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public Duration maxIdleTime() {
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return maxIdleTime;
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}
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public SmithyHttpTransportConfig maxIdleTime(Duration maxIdleTime) {
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this.maxIdleTime = maxIdleTime;
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return this;
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}
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public Integer h2StreamsPerConnection() {
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return h2StreamsPerConnection;
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}
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public SmithyHttpTransportConfig h2StreamsPerConnection(int h2StreamsPerConnection) {
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this.h2StreamsPerConnection = h2StreamsPerConnection;
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return this;
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}
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public Integer h2InitialWindowSize() {
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return h2InitialWindowSize;
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}
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public SmithyHttpTransportConfig h2InitialWindowSize(int h2InitialWindowSize) {
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this.h2InitialWindowSize = h2InitialWindowSize;
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return this;
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}
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public HttpVersionPolicy httpVersionPolicy() {
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return httpVersionPolicy;
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}
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public SmithyHttpTransportConfig httpVersionPolicy(HttpVersionPolicy httpVersionPolicy) {
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this.httpVersionPolicy = httpVersionPolicy;
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return this;
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}
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@Override
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public SmithyHttpTransportConfig fromDocument(Document doc) {
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super.fromDocument(doc);
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var config = doc.asStringMap();
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var maxConns = config.get("maxConnections");
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if (maxConns != null) {
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this.maxConnections = maxConns.asInteger();
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}
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var idle = config.get("maxIdleTimeMs");
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if (idle != null) {
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this.maxIdleTime = Duration.ofMillis(idle.asLong());
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}
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var h2Streams = config.get("h2StreamsPerConnection");
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if (h2Streams != null) {
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this.h2StreamsPerConnection = h2Streams.asInteger();
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}
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var h2Window = config.get("h2InitialWindowSize");
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if (h2Window != null) {
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this.h2InitialWindowSize = h2Window.asInteger();
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}
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var versionPolicy = config.get("httpVersionPolicy");
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if (versionPolicy != null) {
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this.httpVersionPolicy = HttpVersionPolicy.valueOf(versionPolicy.asString());
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}
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return this;
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}
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}

‎client/client-http-smithy/src/main/resources/META-INF/services/software.amazon.smithy.java.client.core.ClientTransportFactory‎

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software.amazon.smithy.java.client.http.smithy.SmithyHttpClientTransport$Factory

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