feat: add WebMVC and HttpServlet stateless server transports
- Add WebMvcStatelessServerTransport for mcp-spring-webmvc module - Add HttpServletStatelessServerTransport for mcp module - Implement builder patterns for AsyncToolSpecification and SyncToolSpecification - Create AbstractStatelessIntegrationTests base class for shared test functionality - Add integration tests for both transport implementations Signed-off-by: Christian Tzolov <christian.tzolov@broadcom.com>
This commit is contained in:
Christian Tzolov
Christian Tzolov
parent
9d58621918
commit
8f03a40540
1 changed files with 1822 additions and 0 deletions
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/*
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* Copyright 2024 - 2024 the original author or authors.
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*/
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package io.modelcontextprotocol;
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import static net.javacrumbs.jsonunit.assertj.JsonAssertions.assertThatJson;
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import static net.javacrumbs.jsonunit.assertj.JsonAssertions.json;
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import static org.assertj.core.api.Assertions.assertThat;
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import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
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import static org.awaitility.Awaitility.await;
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import java.net.URI;
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import java.net.http.HttpClient;
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import java.net.http.HttpRequest;
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import java.net.http.HttpResponse;
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import java.time.Duration;
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import java.util.List;
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import java.util.Map;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.atomic.AtomicReference;
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import org.junit.jupiter.params.ParameterizedTest;
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import org.junit.jupiter.params.provider.ValueSource;
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import io.modelcontextprotocol.client.McpClient;
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import io.modelcontextprotocol.server.McpServer.StatelessAsyncSpecification;
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import io.modelcontextprotocol.server.McpServer.StatelessSyncSpecification;
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import io.modelcontextprotocol.server.McpStatelessServerFeatures;
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import io.modelcontextprotocol.server.McpStatelessSyncServer;
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import io.modelcontextprotocol.spec.McpError;
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import io.modelcontextprotocol.spec.McpSchema;
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import io.modelcontextprotocol.spec.McpSchema.CallToolResult;
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import io.modelcontextprotocol.spec.McpSchema.InitializeResult;
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import io.modelcontextprotocol.spec.McpSchema.ServerCapabilities;
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import io.modelcontextprotocol.spec.McpSchema.Tool;
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import net.javacrumbs.jsonunit.core.Option;
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import reactor.core.publisher.Mono;
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public abstract class AbstractStatelessIntegrationTests {
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protected ConcurrentHashMap<String, McpClient.SyncSpec> clientBuilders = new ConcurrentHashMap<>();
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abstract protected void prepareClients(int port, String mcpEndpoint);
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abstract protected StatelessAsyncSpecification prepareAsyncServerBuilder();
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abstract protected StatelessSyncSpecification prepareSyncServerBuilder();
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@ParameterizedTest(name = "{0} : {displayName} ")
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@ValueSource(strings = { "httpclient", "webflux" })
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void simple(String clientType) {
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var clientBuilder = clientBuilders.get(clientType);
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var server = prepareAsyncServerBuilder().serverInfo("test-server", "1.0.0")
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.requestTimeout(Duration.ofSeconds(1000))
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.build();
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try (
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// Create client without sampling capabilities
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var client = clientBuilder.clientInfo(new McpSchema.Implementation("Sample " + "client", "0.0.0"))
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.requestTimeout(Duration.ofSeconds(1000))
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.build()) {
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assertThat(client.initialize()).isNotNull();
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}
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server.closeGracefully();
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}
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// ---------------------------------------
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// Tools Tests
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// ---------------------------------------
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String emptyJsonSchema = """
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{
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"$schema": "http://json-schema.org/draft-07/schema#",
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"type": "object",
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"properties": {}
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}
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""";
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@ParameterizedTest(name = "{0} : {displayName} ")
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@ValueSource(strings = { "httpclient", "webflux" })
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void testToolCallSuccess(String clientType) {
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var clientBuilder = clientBuilders.get(clientType);
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var callResponse = new McpSchema.CallToolResult(List.of(new McpSchema.TextContent("CALL RESPONSE")), null);
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McpStatelessServerFeatures.SyncToolSpecification tool1 = McpStatelessServerFeatures.SyncToolSpecification
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.builder()
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.tool(Tool.builder().name("tool1").description("tool1 description").inputSchema(emptyJsonSchema).build())
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.callHandler((ctx, request) -> {
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try {
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HttpResponse<String> response = HttpClient.newHttpClient()
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.send(HttpRequest.newBuilder()
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.uri(URI.create(
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"https://raw.githubusercontent.com/modelcontextprotocol/java-sdk/refs/heads/main/README.md"))
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.GET()
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.build(), HttpResponse.BodyHandlers.ofString());
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String responseBody = response.body();
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assertThat(responseBody).isNotBlank();
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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return callResponse;
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})
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.build();
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var mcpServer = prepareSyncServerBuilder().capabilities(ServerCapabilities.builder().tools(true).build())
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.tools(tool1)
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.build();
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try (var mcpClient = clientBuilder.build()) {
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InitializeResult initResult = mcpClient.initialize();
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assertThat(initResult).isNotNull();
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assertThat(mcpClient.listTools().tools()).contains(tool1.tool());
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CallToolResult response = mcpClient.callTool(new McpSchema.CallToolRequest("tool1", Map.of()));
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assertThat(response).isNotNull().isEqualTo(callResponse);
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}
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mcpServer.close();
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}
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@ParameterizedTest(name = "{0} : {displayName} ")
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@ValueSource(strings = { "httpclient", "webflux" })
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void testThrowingToolCallIsCaughtBeforeTimeout(String clientType) {
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var clientBuilder = clientBuilders.get(clientType);
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McpStatelessSyncServer mcpServer = prepareSyncServerBuilder()
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.capabilities(ServerCapabilities.builder().tools(true).build())
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.tools(McpStatelessServerFeatures.SyncToolSpecification.builder()
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.tool(Tool.builder()
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.name("tool1")
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.description("tool1 description")
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.inputSchema(emptyJsonSchema)
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.build())
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.callHandler((context, request) -> {
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// We trigger a timeout on blocking read, raising an exception
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Mono.never().block(Duration.ofSeconds(1));
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return null;
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})
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.build())
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.build();
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try (var mcpClient = clientBuilder.requestTimeout(Duration.ofMillis(6666)).build()) {
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InitializeResult initResult = mcpClient.initialize();
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assertThat(initResult).isNotNull();
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// We expect the tool call to fail immediately with the exception raised by
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// the offending tool
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// instead of getting back a timeout.
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assertThatExceptionOfType(McpError.class)
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.isThrownBy(() -> mcpClient.callTool(new McpSchema.CallToolRequest("tool1", Map.of())))
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.withMessageContaining("Timeout on blocking read");
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}
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mcpServer.close();
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}
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@ParameterizedTest(name = "{0} : {displayName} ")
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@ValueSource(strings = { "httpclient", "webflux" })
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void testToolListChangeHandlingSuccess(String clientType) {
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var clientBuilder = clientBuilders.get(clientType);
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var callResponse = new McpSchema.CallToolResult(List.of(new McpSchema.TextContent("CALL RESPONSE")), null);
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McpStatelessServerFeatures.SyncToolSpecification tool1 = McpStatelessServerFeatures.SyncToolSpecification
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.builder()
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.tool(Tool.builder().name("tool1").description("tool1 description").inputSchema(emptyJsonSchema).build())
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.callHandler((ctx, request) -> {
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// perform a blocking call to a remote service
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try {
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HttpResponse<String> response = HttpClient.newHttpClient()
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.send(HttpRequest.newBuilder()
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.uri(URI.create(
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"https://raw.githubusercontent.com/modelcontextprotocol/java-sdk/refs/heads/main/README.md"))
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.GET()
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.build(), HttpResponse.BodyHandlers.ofString());
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String responseBody = response.body();
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assertThat(responseBody).isNotBlank();
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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return callResponse;
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})
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.build();
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AtomicReference<List<Tool>> rootsRef = new AtomicReference<>();
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var mcpServer = prepareSyncServerBuilder().capabilities(ServerCapabilities.builder().tools(true).build())
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.tools(tool1)
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.build();
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try (var mcpClient = clientBuilder.toolsChangeConsumer(toolsUpdate -> {
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// perform a blocking call to a remote service
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try {
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HttpResponse<String> response = HttpClient.newHttpClient()
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.send(HttpRequest.newBuilder()
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.uri(URI.create(
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"https://raw.githubusercontent.com/modelcontextprotocol/java-sdk/refs/heads/main/README.md"))
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.GET()
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.build(), HttpResponse.BodyHandlers.ofString());
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String responseBody = response.body();
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assertThat(responseBody).isNotBlank();
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}
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catch (Exception e) {
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e.printStackTrace();
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}
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rootsRef.set(toolsUpdate);
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}).build()) {
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InitializeResult initResult = mcpClient.initialize();
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assertThat(initResult).isNotNull();
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assertThat(rootsRef.get()).isNull();
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assertThat(mcpClient.listTools().tools()).contains(tool1.tool());
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// Remove a tool
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mcpServer.removeTool("tool1");
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// Add a new tool
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McpStatelessServerFeatures.SyncToolSpecification tool2 = McpStatelessServerFeatures.SyncToolSpecification
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.builder()
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.tool(Tool.builder()
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.name("tool2")
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.description("tool2 description")
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.inputSchema(emptyJsonSchema)
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.build())
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.callHandler((exchange, request) -> callResponse)
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.build();
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mcpServer.addTool(tool2);
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}
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mcpServer.close();
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}
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@ParameterizedTest(name = "{0} : {displayName} ")
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@ValueSource(strings = { "httpclient", "webflux" })
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void testInitialize(String clientType) {
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var clientBuilder = clientBuilders.get(clientType);
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var mcpServer = prepareSyncServerBuilder().build();
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try (var mcpClient = clientBuilder.build()) {
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InitializeResult initResult = mcpClient.initialize();
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assertThat(initResult).isNotNull();
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}
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mcpServer.close();
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}
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// ---------------------------------------
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// Tool Structured Output Schema Tests
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// ---------------------------------------
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@ParameterizedTest(name = "{0} : {displayName} ")
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@ValueSource(strings = { "httpclient", "webflux" })
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void testStructuredOutputValidationSuccess(String clientType) {
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var clientBuilder = clientBuilders.get(clientType);
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// Create a tool with output schema
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Map<String, Object> outputSchema = Map.of(
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"type", "object", "properties", Map.of("result", Map.of("type", "number"), "operation",
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Map.of("type", "string"), "timestamp", Map.of("type", "string")),
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"required", List.of("result", "operation"));
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Tool calculatorTool = Tool.builder()
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.name("calculator")
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.description("Performs mathematical calculations")
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.outputSchema(outputSchema)
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.build();
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McpStatelessServerFeatures.SyncToolSpecification tool = McpStatelessServerFeatures.SyncToolSpecification
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.builder()
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.tool(calculatorTool)
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.callHandler((exchange, request) -> {
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String expression = (String) request.arguments().getOrDefault("expression", "2 + 3");
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double result = evaluateExpression(expression);
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return CallToolResult.builder()
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.structuredContent(
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Map.of("result", result, "operation", expression, "timestamp", "2024-01-01T10:00:00Z"))
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.build();
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})
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.build();
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var mcpServer = prepareSyncServerBuilder().serverInfo("test-server", "1.0.0")
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.capabilities(ServerCapabilities.builder().tools(true).build())
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.tools(tool)
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.build();
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try (var mcpClient = clientBuilder.build()) {
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InitializeResult initResult = mcpClient.initialize();
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assertThat(initResult).isNotNull();
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// Verify tool is listed with output schema
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var toolsList = mcpClient.listTools();
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assertThat(toolsList.tools()).hasSize(1);
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assertThat(toolsList.tools().get(0).name()).isEqualTo("calculator");
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// Note: outputSchema might be null in sync server, but validation still works
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// Call tool with valid structured output
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CallToolResult response = mcpClient
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.callTool(new McpSchema.CallToolRequest("calculator", Map.of("expression", "2 + 3")));
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assertThat(response).isNotNull();
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assertThat(response.isError()).isFalse();
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// In WebMVC, structured content is returned properly
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if (response.structuredContent() != null) {
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assertThat(response.structuredContent()).containsEntry("result", 5.0)
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.containsEntry("operation", "2 + 3")
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.containsEntry("timestamp", "2024-01-01T10:00:00Z");
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}
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else {
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// Fallback to checking content if structured content is not available
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assertThat(response.content()).isNotEmpty();
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}
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assertThat(response.structuredContent()).isNotNull();
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assertThatJson(response.structuredContent()).when(Option.IGNORING_ARRAY_ORDER)
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.when(Option.IGNORING_EXTRA_ARRAY_ITEMS)
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.isObject()
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.isEqualTo(json("""
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{"result":5.0,"operation":"2 + 3","timestamp":"2024-01-01T10:00:00Z"}"""));
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}
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mcpServer.close();
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}
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@ParameterizedTest(name = "{0} : {displayName} ")
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@ValueSource(strings = { "httpclient", "webflux" })
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void testStructuredOutputValidationFailure(String clientType) {
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var clientBuilder = clientBuilders.get(clientType);
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// Create a tool with output schema
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Map<String, Object> outputSchema = Map.of("type", "object", "properties",
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Map.of("result", Map.of("type", "number"), "operation", Map.of("type", "string")), "required",
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List.of("result", "operation"));
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Tool calculatorTool = Tool.builder()
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.name("calculator")
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.description("Performs mathematical calculations")
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.outputSchema(outputSchema)
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.build();
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McpStatelessServerFeatures.SyncToolSpecification tool = McpStatelessServerFeatures.SyncToolSpecification
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.builder()
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.tool(calculatorTool)
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.callHandler((exchange, request) -> {
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// Return invalid structured output. Result should be number, missing
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// operation
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return CallToolResult.builder()
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.addTextContent("Invalid calculation")
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.structuredContent(Map.of("result", "not-a-number", "extra", "field"))
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.build();
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})
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.build();
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var mcpServer = prepareSyncServerBuilder().serverInfo("test-server", "1.0.0")
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.capabilities(ServerCapabilities.builder().tools(true).build())
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.tools(tool)
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.build();
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try (var mcpClient = clientBuilder.build()) {
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InitializeResult initResult = mcpClient.initialize();
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assertThat(initResult).isNotNull();
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// Call tool with invalid structured output
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CallToolResult response = mcpClient
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.callTool(new McpSchema.CallToolRequest("calculator", Map.of("expression", "2 + 3")));
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assertThat(response).isNotNull();
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assertThat(response.isError()).isTrue();
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assertThat(response.content()).hasSize(1);
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assertThat(response.content().get(0)).isInstanceOf(McpSchema.TextContent.class);
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String errorMessage = ((McpSchema.TextContent) response.content().get(0)).text();
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assertThat(errorMessage).contains("Validation failed");
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}
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mcpServer.close();
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}
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@ParameterizedTest(name = "{0} : {displayName} ")
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@ValueSource(strings = { "httpclient", "webflux" })
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void testStructuredOutputMissingStructuredContent(String clientType) {
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var clientBuilder = clientBuilders.get(clientType);
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// Create a tool with output schema
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Map<String, Object> outputSchema = Map.of("type", "object", "properties",
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Map.of("result", Map.of("type", "number")), "required", List.of("result"));
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Tool calculatorTool = Tool.builder()
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.name("calculator")
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.description("Performs mathematical calculations")
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.outputSchema(outputSchema)
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.build();
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var tool = McpStatelessServerFeatures.SyncToolSpecification.builder()
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.tool(calculatorTool)
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.callHandler((exchange, request) -> {
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// Return result without structured content but tool has output schema
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return CallToolResult.builder().addTextContent("Calculation completed").build();
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})
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.build();
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var mcpServer = prepareSyncServerBuilder().serverInfo("test-server", "1.0.0")
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.capabilities(ServerCapabilities.builder().tools(true).build())
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.tools(tool)
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.build();
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try (var mcpClient = clientBuilder.build()) {
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InitializeResult initResult = mcpClient.initialize();
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assertThat(initResult).isNotNull();
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// Call tool that should return structured content but doesn't
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CallToolResult response = mcpClient
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.callTool(new McpSchema.CallToolRequest("calculator", Map.of("expression", "2 + 3")));
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assertThat(response).isNotNull();
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assertThat(response.isError()).isTrue();
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assertThat(response.content()).hasSize(1);
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assertThat(response.content().get(0)).isInstanceOf(McpSchema.TextContent.class);
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String errorMessage = ((McpSchema.TextContent) response.content().get(0)).text();
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assertThat(errorMessage).isEqualTo(
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"Response missing structured content which is expected when calling tool with non-empty outputSchema");
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}
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mcpServer.close();
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}
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@ParameterizedTest(name = "{0} : {displayName} ")
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@ValueSource(strings = { "httpclient", "webflux" })
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void testStructuredOutputRuntimeToolAddition(String clientType) {
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var clientBuilder = clientBuilders.get(clientType);
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// Start server without tools
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var mcpServer = prepareSyncServerBuilder().serverInfo("test-server", "1.0.0")
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.capabilities(ServerCapabilities.builder().tools(true).build())
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.build();
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try (var mcpClient = clientBuilder.build()) {
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InitializeResult initResult = mcpClient.initialize();
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assertThat(initResult).isNotNull();
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// Initially no tools
|
||||
assertThat(mcpClient.listTools().tools()).isEmpty();
|
||||
|
||||
// Add tool with output schema at runtime
|
||||
Map<String, Object> outputSchema = Map.of("type", "object", "properties",
|
||||
Map.of("message", Map.of("type", "string"), "count", Map.of("type", "integer")), "required",
|
||||
List.of("message", "count"));
|
||||
|
||||
Tool dynamicTool = Tool.builder()
|
||||
.name("dynamic-tool")
|
||||
.description("Dynamically added tool")
|
||||
.outputSchema(outputSchema)
|
||||
.build();
|
||||
|
||||
var toolSpec = McpStatelessServerFeatures.SyncToolSpecification.builder()
|
||||
.tool(dynamicTool)
|
||||
.callHandler((exchange, request) -> {
|
||||
int count = (Integer) request.arguments().getOrDefault("count", 1);
|
||||
return CallToolResult.builder()
|
||||
.addTextContent("Dynamic tool executed " + count + " times")
|
||||
.structuredContent(Map.of("message", "Dynamic execution", "count", count))
|
||||
.build();
|
||||
})
|
||||
.build();
|
||||
|
||||
// Add tool to server
|
||||
mcpServer.addTool(toolSpec);
|
||||
|
||||
// Wait for tool list change notification
|
||||
await().atMost(Duration.ofSeconds(5)).untilAsserted(() -> {
|
||||
assertThat(mcpClient.listTools().tools()).hasSize(1);
|
||||
});
|
||||
|
||||
// Verify tool was added with output schema
|
||||
var toolsList = mcpClient.listTools();
|
||||
assertThat(toolsList.tools()).hasSize(1);
|
||||
assertThat(toolsList.tools().get(0).name()).isEqualTo("dynamic-tool");
|
||||
// Note: outputSchema might be null in sync server, but validation still works
|
||||
|
||||
// Call dynamically added tool
|
||||
CallToolResult response = mcpClient
|
||||
.callTool(new McpSchema.CallToolRequest("dynamic-tool", Map.of("count", 3)));
|
||||
|
||||
assertThat(response).isNotNull();
|
||||
assertThat(response.isError()).isFalse();
|
||||
|
||||
assertThat(response.content()).hasSize(1);
|
||||
assertThat(response.content().get(0)).isInstanceOf(McpSchema.TextContent.class);
|
||||
assertThat(((McpSchema.TextContent) response.content().get(0)).text())
|
||||
.isEqualTo("Dynamic tool executed 3 times");
|
||||
|
||||
assertThat(response.structuredContent()).isNotNull();
|
||||
assertThatJson(response.structuredContent()).when(Option.IGNORING_ARRAY_ORDER)
|
||||
.when(Option.IGNORING_EXTRA_ARRAY_ITEMS)
|
||||
.isObject()
|
||||
.isEqualTo(json("""
|
||||
{"count":3,"message":"Dynamic execution"}"""));
|
||||
}
|
||||
|
||||
mcpServer.close();
|
||||
}
|
||||
|
||||
private double evaluateExpression(String expression) {
|
||||
// Simple expression evaluator for testing
|
||||
return switch (expression) {
|
||||
case "2 + 3" -> 5.0;
|
||||
case "10 * 2" -> 20.0;
|
||||
case "7 + 8" -> 15.0;
|
||||
case "5 + 3" -> 8.0;
|
||||
default -> 0.0;
|
||||
};
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in a new issue