Connector to Helidon 2 Web Client

Signed-off-by: Jan Supol <jan.supol@oracle.com>

connectors/helidon-connector/pom.xml

@@ -0,0 +1,78 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+    Copyright (c) 2020 Oracle and/or its affiliates. All rights reserved.
+
+    This program and the accompanying materials are made available under the
+    terms of the Eclipse Public License v. 2.0, which is available at
+    http://www.eclipse.org/legal/epl-2.0.
+
+    This Source Code may also be made available under the following Secondary
+    Licenses when the conditions for such availability set forth in the
+    Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
+    version 2 with the GNU Classpath Exception, which is available at
+    https://www.gnu.org/software/classpath/license.html.
+
+    SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
+
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>project</artifactId>
+        <groupId>org.glassfish.jersey.connectors</groupId>
+        <version>2.31-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>jersey-helidon-connector</artifactId>
+    <packaging>jar</packaging>
+    <name>jersey-connectors-helidon</name>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.helidon.webclient</groupId>
+            <artifactId>helidon-webclient</artifactId>
+            <!-- Dear user, please use more stable version -->
+            <version>2.0.0-M3</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.glassfish.jersey.test-framework.providers</groupId>
+            <artifactId>jersey-test-framework-provider-grizzly2</artifactId>
+            <version>${project.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.glassfish.jersey.media</groupId>
+            <artifactId>jersey-media-sse</artifactId>
+            <version>${project.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>com.sun.istack</groupId>
+                <artifactId>istack-commons-maven-plugin</artifactId>
+                <inherited>true</inherited>
+            </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>build-helper-maven-plugin</artifactId>
+                <inherited>true</inherited>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <inherited>false</inherited>
+                <configuration>
+                    <source>11</source>
+                    <target>11</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

connectors/helidon-connector/src/main/java/org/glassfish/jersey/helidon/connector/HelidonConnector.java

@@ -0,0 +1,249 @@
+/*
+ * Copyright (c) 2020 Oracle and/or its affiliates. All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0, which is available at
+ * http://www.eclipse.org/legal/epl-2.0.
+ *
+ * This Source Code may also be made available under the following Secondary
+ * Licenses when the conditions for such availability set forth in the
+ * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
+ * version 2 with the GNU Classpath Exception, which is available at
+ * https://www.gnu.org/software/classpath/license.html.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
+ */
+
+package org.glassfish.jersey.helidon.connector;
+
+import io.helidon.common.Version;
+import io.helidon.webclient.WebClient;
+import io.helidon.webclient.WebClientRequestBuilder;
+import io.helidon.webclient.WebClientResponse;
+import org.glassfish.jersey.client.ClientAsyncExecutorLiteral;
+import org.glassfish.jersey.client.ClientConfig;
+import org.glassfish.jersey.client.ClientProperties;
+import org.glassfish.jersey.client.ClientRequest;
+import org.glassfish.jersey.client.ClientResponse;
+import org.glassfish.jersey.client.JerseyClient;
+import org.glassfish.jersey.client.spi.AsyncConnectorCallback;
+import org.glassfish.jersey.client.spi.Connector;
+import org.glassfish.jersey.internal.util.PropertiesHelper;
+import org.glassfish.jersey.spi.ExecutorServiceProvider;
+
+import javax.ws.rs.ProcessingException;
+import javax.ws.rs.client.Client;
+import javax.ws.rs.core.Configuration;
+import javax.ws.rs.core.Response;
+import java.io.FilterInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.security.AccessController;
+import java.time.temporal.ChronoUnit;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionStage;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Future;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.function.BiConsumer;
+import java.util.logging.Logger;
+
+/**
+ * A {@link Connector} that utilizes the Helidon HTTP Client to send and receive
+ * HTTP request and responses.
+ */
+class HelidonConnector implements Connector {
+
+    private static final String helidonVersion = "Helidon/" + Version.VERSION + " (java " + AccessController
+            .doPrivileged(PropertiesHelper.getSystemProperty("java.runtime.version")) + ")";
+    static final Logger LOGGER = Logger.getLogger(HelidonConnector.class.getName());
+
+    private final WebClient webClient;
+
+    private final ExecutorServiceKeeper executorServiceKeeper;
+    private final HelidonEntity.HelidonEntityType entityType;
+
+    private static final InputStream NO_CONTENT_INPUT_STREAM = new InputStream() {
+        @Override
+        public int read() throws IOException {
+            return -1;
+        }
+    };
+    // internal implementation entity type, can be removed in the future
+    // settable for testing purposes
+    private static final String INTERNAL_ENTITY_TYPE = "jersey.config.helidon.client.entity.type";
+
+    HelidonConnector(final Client client, final Configuration config) {
+        executorServiceKeeper = new ExecutorServiceKeeper(client);
+        entityType = getEntityType(config);
+
+        final WebClient.Builder webClientBuilder = WebClient.builder();
+
+        webClientBuilder.addReader(HelidonStructures.createInputStreamBodyReader());
+        HelidonEntity.helidonWriter(entityType).ifPresent(webClientBuilder::addWriter);
+
+        HelidonStructures.createProxy(config).ifPresent(webClientBuilder::proxy);
+
+        HelidonStructures.helidonConfig(config).ifPresent(webClientBuilder::config);
+
+        webClientBuilder.connectTimeout(ClientProperties.getValue(config.getProperties(),
+                ClientProperties.CONNECT_TIMEOUT, 10000), ChronoUnit.MILLIS);
+
+        HelidonStructures.createSSL(client.getSslContext()).ifPresent(webClientBuilder::ssl);
+
+        webClient = webClientBuilder.build();
+    }
+
+    @Override
+    public ClientResponse apply(ClientRequest request) {
+        try {
+            return applyInternal(request).toCompletableFuture().get();
+        } catch (InterruptedException | ExecutionException e) {
+            throw new ProcessingException(e);
+        }
+    }
+
+    @Override
+    public Future<?> apply(ClientRequest request, AsyncConnectorCallback callback) {
+        final BiConsumer<? super ClientResponse, ? super Throwable> action = (r, th) -> {
+            if (th == null) callback.response(r);
+            else callback.failure(th);
+        };
+        return applyInternal(request)
+                .whenCompleteAsync(action, executorServiceKeeper.getExecutorService(request))
+                .toCompletableFuture();
+    }
+
+    @Override
+    public String getName() {
+        return helidonVersion;
+    }
+
+    @Override
+    public void close() {
+
+    }
+
+    private CompletionStage<ClientResponse> applyInternal(ClientRequest request) {
+        final WebClientRequestBuilder webClientRequestBuilder = webClient.method(request.getMethod());
+        webClientRequestBuilder.uri(request.getUri());
+
+        webClientRequestBuilder.headers(HelidonStructures.createHeaders(request.getRequestHeaders()));
+
+        for (String propertyName : request.getConfiguration().getPropertyNames()) {
+            Object property = request.getConfiguration().getProperty(propertyName);
+            if (!propertyName.startsWith("jersey") && String.class.isInstance(property)) {
+                webClientRequestBuilder.property(propertyName, (String) property);
+            }
+        }
+
+        for (String propertyName : request.getPropertyNames()) {
+            Object property = request.resolveProperty(propertyName, null);
+            if (!propertyName.startsWith("jersey") && String.class.isInstance(property)) {
+                webClientRequestBuilder.property(propertyName, (String) property);
+            }
+        }
+
+        // 2.0.0-M3
+        // HelidonStructures.createProxy(request).ifPresent(webClientRequestBuilder::proxy);
+
+        webClientRequestBuilder.followRedirects(request.resolveProperty(ClientProperties.FOLLOW_REDIRECTS, true));
+        webClientRequestBuilder.readTimeout(request.resolveProperty(ClientProperties.READ_TIMEOUT, 10000), ChronoUnit.MILLIS);
+
+        CompletionStage<WebClientResponse> responseStage = null;
+
+        if (request.hasEntity()) {
+            responseStage = HelidonEntity.submit(
+                    entityType, request, webClientRequestBuilder, executorServiceKeeper.getExecutorService(request)
+            );
+        } else {
+            responseStage = webClientRequestBuilder.submit();
+        }
+
+        return responseStage.thenCompose((a) -> convertResponse(request, a));
+    }
+
+    private CompletionStage<ClientResponse> convertResponse(final ClientRequest requestContext,
+                                                            final WebClientResponse webClientResponse) {
+
+        final ClientResponse responseContext = new ClientResponse(new Response.StatusType() {
+            @Override
+            public int getStatusCode() {
+                return webClientResponse.status().code();
+            }
+
+            @Override
+            public Response.Status.Family getFamily() {
+                return Response.Status.Family.familyOf(getStatusCode());
+            }
+
+            @Override
+            public String getReasonPhrase() {
+                return webClientResponse.status().reasonPhrase();
+            }
+        }, requestContext);
+
+        for (Map.Entry<String, List<String>> entry : webClientResponse.headers().toMap().entrySet()) {
+            for (String value : entry.getValue()) {
+                responseContext.getHeaders().add(entry.getKey(), value);
+            }
+        }
+
+        responseContext.setResolvedRequestUri(webClientResponse.lastEndpointURI());
+
+        final CompletionStage<InputStream> stream = HelidonStructures.hasEntity(webClientResponse)
+                ? webClientResponse.content().as(InputStream.class)
+                : CompletableFuture.supplyAsync(() -> NO_CONTENT_INPUT_STREAM);
+
+        return stream.thenApply((a) -> {
+            responseContext.setEntityStream(new FilterInputStream(a) {
+                private final AtomicBoolean closed = new AtomicBoolean(false);
+
+                @Override
+                public void close() throws IOException {
+                    // Avoid idempotent close in the underlying input stream
+                    if (!closed.compareAndSet(false, true)) {
+                        super.close();
+                    }
+                }
+            });
+            return responseContext;
+        });
+    }
+
+    private static HelidonEntity.HelidonEntityType getEntityType(final Configuration config) {
+        final String helidonType = ClientProperties.getValue(config.getProperties(),
+                INTERNAL_ENTITY_TYPE, HelidonEntity.HelidonEntityType.READABLE_BYTE_CHANNEL.name());
+        final HelidonEntity.HelidonEntityType entityType = HelidonEntity.HelidonEntityType.valueOf(helidonType);
+
+//        if (entityType != HelidonEntity.HelidonEntityType.READABLE_BYTE_CHANNEL) {
+//            // log warning for internal feature - no localization.properties
+//            LOGGER.warning(INTERNAL_ENTITY_TYPE + " is " + entityType.name());
+//        }
+
+        return entityType;
+    }
+
+    private static class ExecutorServiceKeeper {
+        private Optional<ExecutorService> executorService;
+
+        private ExecutorServiceKeeper(Client client) {
+            final ClientConfig config = ((JerseyClient) client).getConfiguration();
+            executorService = Optional.ofNullable(config.getExecutorService());
+        }
+
+        private ExecutorService getExecutorService(ClientRequest request) {
+            if (!executorService.isPresent()) {
+                // cache for multiple requests
+                executorService = Optional.ofNullable(request.getInjectionManager()
+                        .getInstance(ExecutorServiceProvider.class, ClientAsyncExecutorLiteral.INSTANCE).getExecutorService());
+            }
+
+            return executorService.get();
+        }
+    }
+}