test: add mcp-solon-webrx test

mcp-solon/mcp-solon-webrx/pom.xml

@@ -29,7 +29,7 @@
 		</dependency>
 
 		<dependency>
-			<groupId>io.modelcontextprotocol.sdk</groupId>
+			<groupId>io.modelcontextprotocol.sdk.j8</groupId>
 			<artifactId>mcp-test</artifactId>
 			<version>0.8.1</version>
 			<scope>test</scope>
@@ -51,7 +51,6 @@
 			<groupId>org.noear</groupId>
 			<artifactId>solon-net-httputils</artifactId>
 			<version>${solon.version}</version>
-			<scope>test</scope>
 		</dependency>
 
 		<dependency>
@@ -70,7 +69,14 @@
 
 		<dependency>
 			<groupId>org.noear</groupId>
-			<artifactId>solon-boot-jetty</artifactId>
+			<artifactId>solon-boot-smarthttp</artifactId>
+			<version>${solon.version}</version>
+			<scope>test</scope>
+		</dependency>
+
+		<dependency>
+			<groupId>org.noear</groupId>
+			<artifactId>solon-flow</artifactId>
 			<version>${solon.version}</version>
 			<scope>test</scope>
 		</dependency>

mcp-solon/mcp-solon-webrx/src/main/java/io/modelcontextprotocol/client/transport/WebRxSseClientTransport.java

@@ -0,0 +1,319 @@
+/*
+ * Copyright 2024 - 2024 the original author or authors.
+ */
+package io.modelcontextprotocol.client.transport;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import io.modelcontextprotocol.spec.McpClientTransport;
+import io.modelcontextprotocol.spec.McpError;
+import io.modelcontextprotocol.spec.McpSchema;
+import io.modelcontextprotocol.spec.McpSchema.JSONRPCMessage;
+import io.modelcontextprotocol.util.Assert;
+import org.noear.solon.net.http.HttpResponse;
+import org.noear.solon.net.http.HttpUtilsBuilder;
+import org.noear.solon.net.http.textstream.ServerSentEvent;
+import org.noear.solon.rx.SimpleSubscriber;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import reactor.core.publisher.Mono;
+
+import java.io.IOException;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.function.Function;
+
+/**
+ * Server-Sent Events (SSE) implementation of the
+ * {@link io.modelcontextprotocol.spec.McpTransport} that follows the MCP HTTP with SSE
+ * transport specification.
+ *
+ * <p>
+ * This transport establishes a bidirectional communication channel where:
+ * <ul>
+ * <li>Inbound messages are received through an SSE connection from the server</li>
+ * <li>Outbound messages are sent via HTTP POST requests to a server-provided
+ * endpoint</li>
+ * </ul>
+ *
+ * <p>
+ * The message flow follows these steps:
+ * <ol>
+ * <li>The client establishes an SSE connection to the server's /sse endpoint</li>
+ * <li>The server sends an 'endpoint' event containing the URI for sending messages</li>
+ * </ol>
+ *
+ * This implementation uses {@link HttpUtilsBuilder} for HTTP communications and supports JSON. and base JDK8
+ * serialization/deserialization of messages.
+ *
+ * @author Christian Tzolov
+ * @author noear
+ * @see <a href=
+ * "https://spec.modelcontextprotocol.io/specification/basic/transports/#http-with-sse">MCP
+ * HTTP with SSE Transport Specification</a>
+ */
+public class WebRxSseClientTransport implements McpClientTransport {
+
+	private static final Logger logger = LoggerFactory.getLogger(WebRxSseClientTransport.class);
+
+	/** SSE event type for JSON-RPC messages */
+	private static final String MESSAGE_EVENT_TYPE = "message";
+
+	/** SSE event type for endpoint discovery */
+	private static final String ENDPOINT_EVENT_TYPE = "endpoint";
+
+	/** Default SSE endpoint path */
+	private static final String DEFAULT_SSE_ENDPOINT = "/sse";
+
+	/** HttpUtils instance builder */
+	private final HttpUtilsBuilder webBuilder;
+
+	/** SSE endpoint path */
+	private final String sseEndpoint;
+
+	/** JSON object mapper for message serialization/deserialization */
+	protected ObjectMapper objectMapper;
+
+	/** Flag indicating if the transport is in closing state */
+	private volatile boolean isClosing = false;
+
+	/** Latch for coordinating endpoint discovery */
+	private final CountDownLatch closeLatch = new CountDownLatch(1);
+
+	/** Holds the discovered message endpoint URL */
+	private final AtomicReference<String> messageEndpoint = new AtomicReference<>();
+
+	/** Holds the SSE connection future */
+	private final AtomicReference<CompletableFuture<Void>> connectionFuture = new AtomicReference<>();
+
+	/**
+	 * Creates a new transport instance with default HTTP client and object mapper.
+	 * @param webBuilder the HttpUtilsBuilder to use for creating the HttpUtils instance
+	 */
+	public WebRxSseClientTransport(HttpUtilsBuilder webBuilder) {
+		this(webBuilder, new ObjectMapper());
+	}
+
+	/**
+	 * Creates a new transport instance with custom HTTP client builder and object mapper.
+	 * @param webBuilder the HttpUtilsBuilder to use for creating the HttpUtils instance
+	 * @param objectMapper the object mapper for JSON serialization/deserialization
+	 * @throws IllegalArgumentException if objectMapper or clientBuilder is null
+	 */
+	public WebRxSseClientTransport(HttpUtilsBuilder webBuilder, ObjectMapper objectMapper) {
+		this(webBuilder, DEFAULT_SSE_ENDPOINT, objectMapper);
+	}
+
+	/**
+	 * Creates a new transport instance with custom HTTP client builder and object mapper.
+	 * @param webBuilder the HttpUtilsBuilder to use for creating the HttpUtils instance
+	 * @param sseEndpoint the SSE endpoint path
+	 * @param objectMapper the object mapper for JSON serialization/deserialization
+	 * @throws IllegalArgumentException if objectMapper or clientBuilder is null
+	 */
+	public WebRxSseClientTransport(HttpUtilsBuilder webBuilder, String sseEndpoint,
+                                   ObjectMapper objectMapper) {
+		Assert.notNull(objectMapper, "ObjectMapper must not be null");
+		Assert.notNull(webBuilder, "baseUri must not be empty");
+		Assert.hasText(sseEndpoint, "sseEndpoint must not be empty");
+		this.webBuilder = webBuilder;
+		this.sseEndpoint = sseEndpoint;
+		this.objectMapper = objectMapper;
+	}
+
+	/**
+	 * Creates a new builder for {@link WebRxSseClientTransport}.
+	 * @param webBuilder the HttpUtilsBuilder to use for creating the HttpUtils instance
+	 * @return a new builder instance
+	 */
+	public static Builder builder(HttpUtilsBuilder webBuilder) {
+		return new Builder(webBuilder);
+	}
+
+	/**
+	 * Builder for {@link WebRxSseClientTransport}.
+	 */
+	public static class Builder {
+
+		private final HttpUtilsBuilder webBuilder;
+
+		private String sseEndpoint = DEFAULT_SSE_ENDPOINT;
+
+		private ObjectMapper objectMapper = new ObjectMapper();
+
+		/**
+		 * Creates a new builder with the specified base URI.
+		 * @param webBuilder the HttpUtilsBuilder to use for creating the HttpUtils instance
+		 */
+		public Builder(HttpUtilsBuilder webBuilder) {
+			Assert.notNull(webBuilder, "webBuilder must not be empty");
+			this.webBuilder = webBuilder;
+		}
+
+		/**
+		 * Sets the SSE endpoint path.
+		 * @param sseEndpoint the SSE endpoint path
+		 * @return this builder
+		 */
+		public Builder sseEndpoint(String sseEndpoint) {
+			Assert.hasText(sseEndpoint, "sseEndpoint must not be null");
+			this.sseEndpoint = sseEndpoint;
+			return this;
+		}
+
+		/**
+		 * Sets the object mapper for JSON serialization/deserialization.
+		 * @param objectMapper the object mapper
+		 * @return this builder
+		 */
+		public Builder objectMapper(ObjectMapper objectMapper) {
+			Assert.notNull(objectMapper, "objectMapper must not be null");
+			this.objectMapper = objectMapper;
+			return this;
+		}
+
+		/**
+		 * Builds a new {@link WebRxSseClientTransport} instance.
+		 * @return a new transport instance
+		 */
+		public WebRxSseClientTransport build() {
+			return new WebRxSseClientTransport(webBuilder, sseEndpoint, objectMapper);
+		}
+
+	}
+
+	/**
+	 * Establishes the SSE connection with the server and sets up message handling.
+	 *
+	 * <p>
+	 * This method:
+	 * <ul>
+	 * <li>Initiates the SSE connection</li>
+	 * <li>Handles endpoint discovery events</li>
+	 * <li>Processes incoming JSON-RPC messages</li>
+	 * </ul>
+	 * @param handler the function to process received JSON-RPC messages
+	 * @return a Mono that completes when the connection is established
+	 */
+	@Override
+	public Mono<Void> connect(Function<Mono<JSONRPCMessage>, Mono<JSONRPCMessage>> handler) {
+		CompletableFuture<Void> future = new CompletableFuture<>();
+		connectionFuture.set(future);
+
+		webBuilder.build(this.sseEndpoint)
+				.execAsSseStream("GET")
+				.subscribe(new SimpleSubscriber<ServerSentEvent>()
+						.doOnNext(event -> {
+							if (isClosing) {
+								return;
+							}
+
+							try {
+								if (ENDPOINT_EVENT_TYPE.equals(event.getEvent())) {
+									String endpoint = event.data();
+									messageEndpoint.set(endpoint);
+									closeLatch.countDown();
+									future.complete(null);
+								} else if (MESSAGE_EVENT_TYPE.equals(event.getEvent())) {
+									JSONRPCMessage message = McpSchema.deserializeJsonRpcMessage(objectMapper, event.data());
+									handler.apply(Mono.just(message)).subscribe();
+								} else {
+									logger.error("Received unrecognized SSE event type: {}", event.getEvent());
+								}
+							} catch (IOException e) {
+								logger.error("Error processing SSE event", e);
+								future.completeExceptionally(e);
+							}
+						}).doOnError(error -> {
+							if (!isClosing) {
+								logger.warn("SSE connection error", error);
+								future.completeExceptionally(error);
+							}
+						}));
+
+		return Mono.fromFuture(future);
+	}
+
+	/**
+	 * Sends a JSON-RPC message to the server.
+	 *
+	 * <p>
+	 * This method waits for the message endpoint to be discovered before sending the
+	 * message. The message is serialized to JSON and sent as an HTTP POST request.
+	 * @param message the JSON-RPC message to send
+	 * @return a Mono that completes when the message is sent
+	 * @throws McpError if the message endpoint is not available or the wait times out
+	 */
+	@Override
+	public Mono<Void> sendMessage(JSONRPCMessage message) {
+		if (isClosing) {
+			return Mono.empty();
+		}
+
+		try {
+			if (!closeLatch.await(10, TimeUnit.SECONDS)) {
+				return Mono.error(new McpError("Failed to wait for the message endpoint"));
+			}
+		} catch (InterruptedException e) {
+			return Mono.error(new McpError("Failed to wait for the message endpoint"));
+		}
+
+		String endpoint = messageEndpoint.get();
+		if (endpoint == null) {
+			return Mono.error(new McpError("No message endpoint available"));
+		}
+
+		try {
+			String jsonText = this.objectMapper.writeValueAsString(message);
+			CompletableFuture<HttpResponse> future = webBuilder.build(endpoint)
+					.header("Content-Type", "application/json")
+					.bodyOfJson(jsonText)
+					.execAsync("POST");
+
+			return Mono.fromFuture(future.thenAccept(response -> {
+				if (response.code() != 200 && response.code() != 201 && response.code() != 202
+						&& response.code() != 206) {
+					logger.error("Error sending message: {}", response.code());
+				}
+			}));
+		} catch (IOException e) {
+			if (!isClosing) {
+				return Mono.error(new RuntimeException("Failed to serialize message", e));
+			}
+			return Mono.empty();
+		}
+	}
+
+	/**
+	 * Gracefully closes the transport connection.
+	 *
+	 * <p>
+	 * Sets the closing flag and cancels any pending connection future. This prevents new
+	 * messages from being sent and allows ongoing operations to complete.
+	 * @return a Mono that completes when the closing process is initiated
+	 */
+	@Override
+	public Mono<Void> closeGracefully() {
+		return Mono.fromRunnable(() -> {
+			isClosing = true;
+			CompletableFuture<Void> future = connectionFuture.get();
+			if (future != null && !future.isDone()) {
+				future.cancel(true);
+			}
+		});
+	}
+
+	/**
+	 * Unmarshals data to the specified type using the configured object mapper.
+	 * @param data the data to unmarshal
+	 * @param typeRef the type reference for the target type
+	 * @param <T> the target type
+	 * @return the unmarshalled object
+	 */
+	@Override
+	public <T> T unmarshalFrom(Object data, TypeReference<T> typeRef) {
+		return this.objectMapper.convertValue(data, typeRef);
+	}
+}