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fix: implement proper MCP SSE transport and JSON-RPC compliance

Browse Source 
- Fixed SSE handler to send proper 'endpoint' event as per MCP spec
- Added CORS headers for browser-based MCP clients
- Fixed camelCase serialization for JSON-RPC compatibility
- Added session management support with Mcp-Session-Id header
- Improved connection handling with proper keepalive messages
- Added OPTIONS handler for CORS preflight requests

The MCP server now properly implements the SSE transport specification
and is compatible with standard MCP clients like mcpinspector.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Thomas Payet 2025-05-27 14:34:00 +02:00
parent 8cf31dfc38
commit 3b18cddf57
9 changed files with 645 additions and 376 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Cargo.lock generated
View File

@ -3784,6 +3784,7 @@ dependencies = [
"insta", "insta",
"meilisearch-auth", "meilisearch-auth",
"meilisearch-types", "meilisearch-types",
"regex",
"reqwest", "reqwest",
"serde", "serde",
"serde_json", "serde_json",

1
crates/meilisearch-mcp/Cargo.toml
View File

@ -24,6 +24,7 @@ tokio = { version = "1.38.0", features = ["full"] }
tracing = "0.1.40" tracing = "0.1.40"
utoipa = { version = "5.3.1", features = ["actix_extras", "time"] } utoipa = { version = "5.3.1", features = ["actix_extras", "time"] }
uuid = { version = "1.10.0", features = ["serde", "v4"] } uuid = { version = "1.10.0", features = ["serde", "v4"] }
regex = "1.10.2"
reqwest = { version = "0.12.5", features = ["json"] } reqwest = { version = "0.12.5", features = ["json"] }
[dev-dependencies] [dev-dependencies]

47
crates/meilisearch-mcp/src/conversion_tests.rs
View File

@ -11,7 +11,7 @@ fn test_convert_simple_get_endpoint() {
); );
assert_eq!(tool.name, "getIndex"); assert_eq!(tool.name, "getIndex");
assert_eq!(tool.description, "GET /indexes/{index_uid}"); assert_eq!(tool.description, "Get information about an index");
assert_eq!(tool.http_method, "GET"); assert_eq!(tool.http_method, "GET");
assert_eq!(tool.path_template, "/indexes/{index_uid}"); assert_eq!(tool.path_template, "/indexes/{index_uid}");
@ -207,6 +207,11 @@ fn create_mock_search_path_item() -> PathItem {
} }
} }
} }
},
"responses": {
"200": {
"description": "Search results"
}
} }
} }
})) }))
@ -238,6 +243,11 @@ fn create_mock_add_documents_path_item() -> PathItem {
} }
} }
} }
},
"responses": {
"202": {
"description": "Accepted"
}
} }
} }
})) }))
@ -265,7 +275,12 @@ fn create_mock_get_document_path_item() -> PathItem {
"type": "string" "type": "string"
} }
} }
] ],
"responses": {
"200": {
"description": "Document found"
}
}
} }
})) }))
.unwrap() .unwrap()
@ -281,10 +296,20 @@ fn create_mock_openapi() -> OpenApi {
"paths": { "paths": {
"/indexes": { "/indexes": {
"get": { "get": {
"summary": "List all indexes" "summary": "List all indexes",
"responses": {
"200": {
"description": "List of indexes"
}
}
}, },
"post": { "post": {
"summary": "Create an index" "summary": "Create an index",
"responses": {
"202": {
"description": "Index created"
}
}
} }
}, },
"/indexes/{index_uid}": { "/indexes/{index_uid}": {
@ -299,7 +324,12 @@ fn create_mock_openapi() -> OpenApi {
"type": "string" "type": "string"
} }
} }
] ],
"responses": {
"200": {
"description": "Index information"
}
}
} }
}, },
"/indexes/{index_uid}/search": { "/indexes/{index_uid}/search": {
@ -314,7 +344,12 @@ fn create_mock_openapi() -> OpenApi {
"type": "string" "type": "string"
} }
} }
] ],
"responses": {
"200": {
"description": "Search results"
}
}
} }
} }
} }

313
crates/meilisearch-mcp/src/e2e_tests.rs
View File

@ -1,5 +1,4 @@
use actix_web::{test, web, App}; use actix_web::{test, web, App};
use futures::StreamExt;
use serde_json::json; use serde_json::json;
#[actix_rt::test] #[actix_rt::test]
@ -33,43 +32,57 @@ async fn test_mcp_full_workflow() {
let server = crate::server::McpServer::new(registry); let server = crate::server::McpServer::new(registry);
// 1. Initialize // 1. Initialize
let init_request = crate::protocol::McpRequest::Initialize { let init_request = crate::protocol::JsonRpcRequest {
params: crate::protocol::InitializeParams { jsonrpc: "2.0".to_string(),
protocol_version: "2024-11-05".to_string(), method: "initialize".to_string(),
capabilities: Default::default(), params: Some(json!({
client_info: crate::protocol::ClientInfo { "protocol_version": "2024-11-05",
name: "test-client".to_string(), "capabilities": {},
version: "1.0.0".to_string(), "client_info": {
}, "name": "test-client",
}, "version": "1.0.0"
}
})),
id: json!(1),
}; };
let init_response = server.handle_request(init_request).await; let init_response = server.handle_json_rpc_request(init_request).await;
assert!(matches!(init_response, crate::protocol::McpResponse::Initialize { .. })); assert!(matches!(init_response, crate::protocol::JsonRpcResponse::Success { .. }));
// 2. List tools // 2. List tools
let list_request = crate::protocol::McpRequest::ListTools; let list_request = crate::protocol::JsonRpcRequest {
let list_response = server.handle_request(list_request).await; jsonrpc: "2.0".to_string(),
method: "tools/list".to_string(),
params: None,
id: json!(2),
};
let list_response = server.handle_json_rpc_request(list_request).await;
let tools = match list_response { let tools = match list_response {
crate::protocol::McpResponse::ListTools { result, .. } => result.tools, crate::protocol::JsonRpcResponse::Success { result, .. } => {
_ => panic!("Expected ListTools response"), let list_result: crate::protocol::ListToolsResult = serde_json::from_value(result).unwrap();
list_result.tools
},
_ => panic!("Expected success response"),
}; };
assert!(!tools.is_empty()); assert!(!tools.is_empty());
// 3. Call a tool // 3. Call a tool
let call_request = crate::protocol::McpRequest::CallTool { let call_request = crate::protocol::JsonRpcRequest {
params: crate::protocol::CallToolParams { jsonrpc: "2.0".to_string(),
name: tools[0].name.clone(), method: "tools/call".to_string(),
arguments: json!({ params: Some(json!({
"name": tools[0].name.clone(),
"arguments": {
"indexUid": "test-index" "indexUid": "test-index"
}), }
}, })),
id: json!(3),
}; };
let call_response = server.handle_request(call_request).await; let call_response = server.handle_json_rpc_request(call_request).await;
assert!(matches!(call_response, crate::protocol::McpResponse::CallTool { .. })); assert!(matches!(call_response, crate::protocol::JsonRpcResponse::Success { .. }));
} }
#[actix_rt::test] #[actix_rt::test]
@ -78,156 +91,162 @@ async fn test_mcp_authentication_integration() {
let server = crate::server::McpServer::new(registry); let server = crate::server::McpServer::new(registry);
// Test with valid API key // Test with valid API key
let request_with_auth = crate::protocol::McpRequest::CallTool { let request_with_auth = crate::protocol::JsonRpcRequest {
params: crate::protocol::CallToolParams { jsonrpc: "2.0".to_string(),
name: "getStats".to_string(), method: "tools/call".to_string(),
arguments: json!({ params: Some(json!({
"name": "getStats",
"arguments": {
"_auth": { "_auth": {
"apiKey": "test-api-key" "apiKey": "test-api-key"
} }
}), }
}, })),
id: json!(1),
}; };
let response = server.handle_request(request_with_auth).await; let response = server.handle_json_rpc_request(request_with_auth).await;
// Depending on auth implementation, this should either succeed or fail appropriately // Depending on auth implementation, this should either succeed or fail appropriately
match response { assert!(matches!(response,
crate::protocol::McpResponse::CallTool { .. } | crate::protocol::JsonRpcResponse::Success { .. } |
crate::protocol::McpResponse::Error { .. } => { crate::protocol::JsonRpcResponse::Error { .. }
// Both are valid responses depending on auth setup ));
}
_ => panic!("Unexpected response type"),
}
} }
#[actix_rt::test] #[actix_rt::test]
async fn test_mcp_streaming_responses() { async fn test_mcp_tool_execution_with_params() {
// Test that long-running operations can stream progress updates let registry = create_test_registry();
let mut registry = crate::registry::McpToolRegistry::new();
registry.register_tool(crate::registry::McpTool {
name: "createIndexWithDocuments".to_string(),
description: "Create index and add documents".to_string(),
input_schema: json!({
"type": "object",
"properties": {
"indexUid": { "type": "string" },
"documents": { "type": "array" }
},
"required": ["indexUid", "documents"]
}),
http_method: "POST".to_string(),
path_template: "/indexes/{index_uid}/documents".to_string(),
});
let server = crate::server::McpServer::new(registry); let server = crate::server::McpServer::new(registry);
let request = crate::protocol::McpRequest::CallTool { // Test tool with complex parameters
params: crate::protocol::CallToolParams { let request = crate::protocol::JsonRpcRequest {
name: "createIndexWithDocuments".to_string(), jsonrpc: "2.0".to_string(),
arguments: json!({ method: "tools/call".to_string(),
"indexUid": "streaming-test", params: Some(json!({
"documents": [ "name": "searchDocuments",
{"id": 1, "title": "Test 1"}, "arguments": {
{"id": 2, "title": "Test 2"}, "indexUid": "products",
] "q": "laptop",
}), "limit": 10,
}, "offset": 0,
"filter": "price > 500",
"sort": ["price:asc"],
"facets": ["brand", "category"]
}
})),
id: json!(1),
}; };
let response = server.handle_request(request).await; let response = server.handle_json_rpc_request(request).await;
match response { match response {
crate::protocol::McpResponse::CallTool { result, .. } => { crate::protocol::JsonRpcResponse::Success { result, .. } => {
// Should contain progress information if available let call_result: crate::protocol::CallToolResult = serde_json::from_value(result).unwrap();
assert!(!result.content.is_empty()); assert!(!call_result.content.is_empty());
assert_eq!(call_result.content[0].content_type, "text");
// Verify the response contains search-related content
assert!(call_result.content[0].text.contains("search") ||
call_result.content[0].text.contains("products"));
} }
_ => panic!("Expected CallTool response"), _ => panic!("Expected success response"),
} }
} }
#[actix_rt::test] #[actix_rt::test]
async fn test_mcp_error_handling_scenarios() { async fn test_mcp_error_handling() {
let registry = create_test_registry();
let server = crate::server::McpServer::new(registry);
// Test with non-existent tool
let request = crate::protocol::JsonRpcRequest {
jsonrpc: "2.0".to_string(),
method: "tools/call".to_string(),
params: Some(json!({
"name": "nonExistentTool",
"arguments": {}
})),
id: json!(1),
};
let response = server.handle_json_rpc_request(request).await;
match response {
crate::protocol::JsonRpcResponse::Error { error, .. } => {
assert_eq!(error.code, crate::protocol::METHOD_NOT_FOUND);
assert!(error.message.contains("Tool not found"));
}
_ => panic!("Expected error response"),
}
// Test with invalid parameters
let request = crate::protocol::JsonRpcRequest {
jsonrpc: "2.0".to_string(),
method: "tools/call".to_string(),
params: Some(json!({
"name": "searchDocuments",
"arguments": {
// Missing required indexUid parameter
"q": "test"
}
})),
id: json!(2),
};
let response = server.handle_json_rpc_request(request).await;
match response {
crate::protocol::JsonRpcResponse::Error { error, .. } => {
assert_eq!(error.code, crate::protocol::INVALID_PARAMS);
assert!(error.message.contains("Invalid parameters") ||
error.message.contains("required"));
}
_ => panic!("Expected error response"),
}
}
#[actix_rt::test]
async fn test_mcp_protocol_version_negotiation() {
let server = crate::server::McpServer::new(crate::registry::McpToolRegistry::new()); let server = crate::server::McpServer::new(crate::registry::McpToolRegistry::new());
// Test various error scenarios // Test with different protocol versions
let error_scenarios = vec![ let request = crate::protocol::JsonRpcRequest {
( jsonrpc: "2.0".to_string(),
crate::protocol::McpRequest::CallTool { method: "initialize".to_string(),
params: crate::protocol::CallToolParams { params: Some(json!({
name: "nonExistentTool".to_string(), "protocol_version": "2024-01-01", // Old version
arguments: json!({}), "capabilities": {},
}, "client_info": {
}, "name": "test-client",
-32601, // Method not found "version": "1.0.0"
),
(
crate::protocol::McpRequest::CallTool {
params: crate::protocol::CallToolParams {
name: "searchDocuments".to_string(),
arguments: json!("invalid"), // Invalid JSON structure
},
},
-32602, // Invalid params
),
];
for (request, expected_code) in error_scenarios {
let response = server.handle_request(request).await;
match response {
crate::protocol::McpResponse::Error { error, .. } => {
assert_eq!(error.code, expected_code);
} }
_ => panic!("Expected Error response"), })),
} id: json!(1),
} };
}
#[actix_rt::test]
async fn test_mcp_concurrent_requests() {
let registry = create_test_registry();
let server = web::Data::new(crate::server::McpServer::new(registry));
// Simulate multiple concurrent requests let response = server.handle_json_rpc_request(request).await;
let futures = (0..10).map(|i| {
let server = server.clone();
async move {
let request = crate::protocol::McpRequest::CallTool {
params: crate::protocol::CallToolParams {
name: "getStats".to_string(),
arguments: json!({ "request_id": i }),
},
};
server.handle_request(request).await
}
});
let results = futures::future::join_all(futures).await; match response {
crate::protocol::JsonRpcResponse::Success { result, .. } => {
// All requests should complete successfully let init_result: crate::protocol::InitializeResult = serde_json::from_value(result).unwrap();
for (i, result) in results.iter().enumerate() { // Server should respond with its supported version
match result { assert_eq!(init_result.protocol_version, "2024-11-05");
crate::protocol::McpResponse::CallTool { .. } |
crate::protocol::McpResponse::Error { .. } => {
// Both are acceptable outcomes
}
_ => panic!("Unexpected response type for request {}", i),
} }
_ => panic!("Expected success response"),
} }
} }
fn create_test_registry() -> crate::registry::McpToolRegistry { fn create_test_registry() -> crate::registry::McpToolRegistry {
let mut registry = crate::registry::McpToolRegistry::new(); let mut registry = crate::registry::McpToolRegistry::new();
// Add some test tools // Add test tools
registry.register_tool(crate::registry::McpTool { registry.register_tool(crate::registry::McpTool {
name: "getStats".to_string(), name: "getStats".to_string(),
description: "Get server statistics".to_string(), description: "Get server statistics".to_string(),
input_schema: json!({ input_schema: json!({
"type": "object", "type": "object",
"properties": {} "properties": {},
"required": []
}), }),
http_method: "GET".to_string(), http_method: "GET".to_string(),
path_template: "/stats".to_string(), path_template: "/stats".to_string(),
@ -235,17 +254,31 @@ fn create_test_registry() -> crate::registry::McpToolRegistry {
registry.register_tool(crate::registry::McpTool { registry.register_tool(crate::registry::McpTool {
name: "searchDocuments".to_string(), name: "searchDocuments".to_string(),
description: "Search for documents".to_string(), description: "Search for documents in an index".to_string(),
input_schema: json!({ input_schema: json!({
"type": "object", "type": "object",
"properties": { "properties": {
"indexUid": { "type": "string" }, "indexUid": {
"q": { "type": "string" } "type": "string",
"description": "The index UID"
},
"q": {
"type": "string",
"description": "Query string"
},
"limit": {
"type": "integer",
"description": "Maximum number of results"
},
"offset": {
"type": "integer",
"description": "Number of results to skip"
}
}, },
"required": ["indexUid"] "required": ["indexUid"]
}), }),
http_method: "POST".to_string(), http_method: "POST".to_string(),
path_template: "/indexes/{index_uid}/search".to_string(), path_template: "/indexes/{indexUid}/search".to_string(),
}); });
registry registry

18
crates/meilisearch-mcp/src/integration.rs
View File

@ -86,15 +86,27 @@ pub fn configure_mcp_route(cfg: &mut web::ServiceConfig, openapi: OpenApi) {
web::resource("/mcp") web::resource("/mcp")
.route(web::get().to(crate::server::mcp_sse_handler)) .route(web::get().to(crate::server::mcp_sse_handler))
.route(web::post().to(mcp_post_handler)) .route(web::post().to(mcp_post_handler))
.route(web::method(actix_web::http::Method::OPTIONS).to(mcp_options_handler))
); );
} }
async fn mcp_post_handler( async fn mcp_post_handler(
req_body: web::Json<crate::protocol::McpRequest>, req_body: web::Json<crate::protocol::JsonRpcRequest>,
server: web::Data<McpServer>, server: web::Data<McpServer>,
) -> Result<HttpResponse, actix_web::Error> { ) -> Result<HttpResponse, actix_web::Error> {
let response = server.handle_request(req_body.into_inner()).await; let response = server.handle_json_rpc_request(req_body.into_inner()).await;
Ok(HttpResponse::Ok().json(response)) Ok(HttpResponse::Ok()
.insert_header(("Access-Control-Allow-Origin", "*"))
.insert_header(("Access-Control-Allow-Headers", "*"))
.json(response))
}
async fn mcp_options_handler() -> Result<HttpResponse, actix_web::Error> {
Ok(HttpResponse::Ok()
.insert_header(("Access-Control-Allow-Origin", "*"))
.insert_header(("Access-Control-Allow-Methods", "GET, POST, OPTIONS"))
.insert_header(("Access-Control-Allow-Headers", "*"))
.finish())
} }
#[cfg(test)] #[cfg(test)]

194
crates/meilisearch-mcp/src/integration_tests.rs
View File

@ -8,26 +8,30 @@ use tokio;
async fn test_mcp_initialize_request() { async fn test_mcp_initialize_request() {
let server = McpServer::new(McpToolRegistry::new()); let server = McpServer::new(McpToolRegistry::new());
let request = McpRequest::Initialize { let request = JsonRpcRequest {
params: InitializeParams { jsonrpc: "2.0".to_string(),
protocol_version: "2024-11-05".to_string(), method: "initialize".to_string(),
capabilities: ClientCapabilities::default(), params: Some(json!({
client_info: ClientInfo { "protocol_version": "2024-11-05",
name: "test-client".to_string(), "capabilities": {},
version: "1.0.0".to_string(), "client_info": {
}, "name": "test-client",
}, "version": "1.0.0"
}
})),
id: json!(1),
}; };
let response = server.handle_request(request).await; let response = server.handle_json_rpc_request(request).await;
match response { match response {
McpResponse::Initialize { result, .. } => { JsonRpcResponse::Success { result, .. } => {
assert_eq!(result.protocol_version, "2024-11-05"); let init_result: InitializeResult = serde_json::from_value(result).unwrap();
assert_eq!(result.server_info.name, "meilisearch-mcp"); assert_eq!(init_result.protocol_version, "2024-11-05");
assert!(result.capabilities.tools.list_changed); assert_eq!(init_result.server_info.name, "meilisearch-mcp");
assert!(init_result.capabilities.tools.list_changed);
} }
_ => panic!("Expected Initialize response"), _ => panic!("Expected success response"),
} }
} }
@ -50,17 +54,23 @@ async fn test_mcp_list_tools_request() {
}); });
let server = McpServer::new(registry); let server = McpServer::new(registry);
let request = McpRequest::ListTools; let request = JsonRpcRequest {
let response = server.handle_request(request).await; jsonrpc: "2.0".to_string(),
method: "tools/list".to_string(),
params: None,
id: json!(2),
};
let response = server.handle_json_rpc_request(request).await;
match response { match response {
McpResponse::ListTools { result, .. } => { JsonRpcResponse::Success { result, .. } => {
assert_eq!(result.tools.len(), 1); let list_result: ListToolsResult = serde_json::from_value(result).unwrap();
assert_eq!(result.tools[0].name, "searchDocuments"); assert_eq!(list_result.tools.len(), 1);
assert_eq!(result.tools[0].description, "Search for documents"); assert_eq!(list_result.tools[0].name, "searchDocuments");
assert!(result.tools[0].input_schema["type"] == "object"); assert_eq!(list_result.tools[0].description, "Search for documents");
assert!(list_result.tools[0].input_schema["type"] == "object");
} }
_ => panic!("Expected ListTools response"), _ => panic!("Expected success response"),
} }
} }
@ -79,43 +89,50 @@ async fn test_mcp_call_tool_request_success() {
}); });
let server = McpServer::new(registry); let server = McpServer::new(registry);
let request = McpRequest::CallTool { let request = JsonRpcRequest {
params: CallToolParams { jsonrpc: "2.0".to_string(),
name: "getStats".to_string(), method: "tools/call".to_string(),
arguments: json!({}), params: Some(json!({
}, "name": "getStats",
"arguments": {}
})),
id: json!(1),
}; };
let response = server.handle_request(request).await; let response = server.handle_json_rpc_request(request).await;
match response { match response {
McpResponse::CallTool { result, .. } => { JsonRpcResponse::Success { result, .. } => {
assert!(!result.content.is_empty()); let call_result: CallToolResult = serde_json::from_value(result).unwrap();
assert_eq!(result.content[0].content_type, "text"); assert!(!call_result.content.is_empty());
assert!(result.is_error.is_none() || !result.is_error.unwrap()); assert_eq!(call_result.content[0].content_type, "text");
assert!(call_result.is_error.is_none() || !call_result.is_error.unwrap());
} }
_ => panic!("Expected CallTool response"), _ => panic!("Expected success response"),
} }
} }
#[tokio::test] #[tokio::test]
async fn test_mcp_call_unknown_tool() { async fn test_mcp_call_unknown_tool() {
let server = McpServer::new(McpToolRegistry::new()); let server = McpServer::new(McpToolRegistry::new());
let request = McpRequest::CallTool { let request = JsonRpcRequest {
params: CallToolParams { jsonrpc: "2.0".to_string(),
name: "unknownTool".to_string(), method: "tools/call".to_string(),
arguments: json!({}), params: Some(json!({
}, "name": "unknownTool",
"arguments": {}
})),
id: json!(1),
}; };
let response = server.handle_request(request).await; let response = server.handle_json_rpc_request(request).await;
match response { match response {
McpResponse::Error { error, .. } => { JsonRpcResponse::Error { error, .. } => {
assert_eq!(error.code, -32601); assert_eq!(error.code, crate::protocol::METHOD_NOT_FOUND);
assert!(error.message.contains("Tool not found")); assert!(error.message.contains("Tool not found"));
} }
_ => panic!("Expected Error response"), _ => panic!("Expected error response"),
} }
} }
@ -138,21 +155,24 @@ async fn test_mcp_call_tool_with_invalid_params() {
}); });
let server = McpServer::new(registry); let server = McpServer::new(registry);
let request = McpRequest::CallTool { let request = JsonRpcRequest {
params: CallToolParams { jsonrpc: "2.0".to_string(),
name: "searchDocuments".to_string(), method: "tools/call".to_string(),
arguments: json!({}), // Missing required indexUid params: Some(json!({
}, "name": "searchDocuments",
"arguments": {} // Missing required indexUid
})),
id: json!(1),
}; };
let response = server.handle_request(request).await; let response = server.handle_json_rpc_request(request).await;
match response { match response {
McpResponse::Error { error, .. } => { JsonRpcResponse::Error { error, .. } => {
assert_eq!(error.code, -32602); assert_eq!(error.code, crate::protocol::INVALID_PARAMS);
assert!(error.message.contains("Invalid parameters")); assert!(error.message.contains("Invalid parameters"));
} }
_ => panic!("Expected Error response"), _ => panic!("Expected error response"),
} }
} }
@ -167,55 +187,60 @@ async fn test_protocol_version_negotiation() {
]; ];
for version in test_versions { for version in test_versions {
let request = McpRequest::Initialize { let request = JsonRpcRequest {
params: InitializeParams { jsonrpc: "2.0".to_string(),
protocol_version: version.to_string(), method: "initialize".to_string(),
capabilities: ClientCapabilities::default(), params: Some(json!({
client_info: ClientInfo { "protocol_version": version,
name: "test-client".to_string(), "capabilities": {},
version: "1.0.0".to_string(), "client_info": {
}, "name": "test-client",
}, "version": "1.0.0"
}
})),
id: json!(1),
}; };
let response = server.handle_request(request).await; let response = server.handle_json_rpc_request(request).await;
match response { match response {
McpResponse::Initialize { result, .. } => { JsonRpcResponse::Success { result, .. } => {
let init_result: InitializeResult = serde_json::from_value(result).unwrap();
// Server should always return its supported version // Server should always return its supported version
assert_eq!(result.protocol_version, "2024-11-05"); assert_eq!(init_result.protocol_version, "2024-11-05");
} }
_ => panic!("Expected Initialize response"), _ => panic!("Expected success response"),
} }
} }
} }
#[tokio::test] #[tokio::test]
async fn test_mcp_response_serialization() { async fn test_json_rpc_response_serialization() {
let response = McpResponse::Initialize { let response = JsonRpcResponse::Success {
jsonrpc: "2.0".to_string(), jsonrpc: "2.0".to_string(),
result: InitializeResult { result: json!({
protocol_version: "2024-11-05".to_string(), "protocol_version": "2024-11-05",
capabilities: ServerCapabilities { "capabilities": {
tools: ToolsCapability { "tools": {
list_changed: true, "list_changed": true
}, },
experimental: json!({}), "experimental": {}
}, },
server_info: ServerInfo { "server_info": {
name: "meilisearch-mcp".to_string(), "name": "meilisearch-mcp",
version: env!("CARGO_PKG_VERSION").to_string(), "version": env!("CARGO_PKG_VERSION")
}, }
}, }),
id: json!(1),
}; };
let serialized = serde_json::to_string(&response).unwrap(); let serialized = serde_json::to_string(&response).unwrap();
let deserialized: McpResponse = serde_json::from_str(&serialized).unwrap(); let deserialized: JsonRpcResponse = serde_json::from_str(&serialized).unwrap();
match deserialized { match deserialized {
McpResponse::Initialize { result, .. } => { JsonRpcResponse::Success { result, .. } => {
assert_eq!(result.protocol_version, "2024-11-05"); assert_eq!(result["protocol_version"], "2024-11-05");
assert_eq!(result.server_info.name, "meilisearch-mcp"); assert_eq!(result["server_info"]["name"], "meilisearch-mcp");
} }
_ => panic!("Deserialization failed"), _ => panic!("Deserialization failed"),
} }
@ -241,13 +266,14 @@ async fn test_tool_result_formatting() {
#[tokio::test] #[tokio::test]
async fn test_error_response_formatting() { async fn test_error_response_formatting() {
let error_response = McpResponse::Error { let error_response = JsonRpcResponse::Error {
jsonrpc: "2.0".to_string(), jsonrpc: "2.0".to_string(),
error: McpError { error: JsonRpcError {
code: -32601, code: -32601,
message: "Method not found".to_string(), message: "Method not found".to_string(),
data: Some(json!({ "method": "unknownMethod" })), data: Some(json!({ "method": "unknownMethod" })),
}, },
id: json!(1),
}; };
let serialized = serde_json::to_string(&error_response).unwrap(); let serialized = serde_json::to_string(&error_response).unwrap();

87
crates/meilisearch-mcp/src/protocol.rs
View File

@ -1,6 +1,40 @@
use serde::{Deserialize, Serialize}; use serde::{Deserialize, Serialize};
use serde_json::Value; use serde_json::Value;
// JSON-RPC 2.0 wrapper types
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct JsonRpcRequest {
pub jsonrpc: String,
pub method: String,
#[serde(skip_serializing_if = "Option::is_none")]
pub params: Option<Value>,
pub id: Value,
}
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(untagged)]
pub enum JsonRpcResponse {
Success {
jsonrpc: String,
result: Value,
id: Value,
},
Error {
jsonrpc: String,
error: JsonRpcError,
id: Value,
},
}
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct JsonRpcError {
pub code: i32,
pub message: String,
#[serde(skip_serializing_if = "Option::is_none")]
pub data: Option<Value>,
}
// MCP-specific request types
#[derive(Debug, Clone, Serialize, Deserialize)] #[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "method")] #[serde(tag = "method")]
pub enum McpRequest { pub enum McpRequest {
@ -18,6 +52,7 @@ pub enum McpRequest {
} }
#[derive(Debug, Clone, Serialize, Deserialize, Default)] #[derive(Debug, Clone, Serialize, Deserialize, Default)]
#[serde(rename_all = "camelCase")]
pub struct InitializeParams { pub struct InitializeParams {
pub protocol_version: String, pub protocol_version: String,
pub capabilities: ClientCapabilities, pub capabilities: ClientCapabilities,
@ -33,6 +68,7 @@ pub struct ClientCapabilities {
} }
#[derive(Debug, Clone, Serialize, Deserialize, Default)] #[derive(Debug, Clone, Serialize, Deserialize, Default)]
#[serde(rename_all = "camelCase")]
pub struct ClientInfo { pub struct ClientInfo {
pub name: String, pub name: String,
pub version: String, pub version: String,
@ -45,28 +81,10 @@ pub struct CallToolParams {
pub arguments: Value, pub arguments: Value,
} }
#[derive(Debug, Clone, Serialize, Deserialize)] // Response types are now just the result objects, wrapped in JsonRpcResponse
#[serde(untagged)]
pub enum McpResponse {
Initialize {
jsonrpc: String,
result: InitializeResult,
},
ListTools {
jsonrpc: String,
result: ListToolsResult,
},
CallTool {
jsonrpc: String,
result: CallToolResult,
},
Error {
jsonrpc: String,
error: McpError,
},
}
#[derive(Debug, Clone, Serialize, Deserialize)] #[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct InitializeResult { pub struct InitializeResult {
pub protocol_version: String, pub protocol_version: String,
pub capabilities: ServerCapabilities, pub capabilities: ServerCapabilities,
@ -81,11 +99,13 @@ pub struct ServerCapabilities {
} }
#[derive(Debug, Clone, Serialize, Deserialize)] #[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct ToolsCapability { pub struct ToolsCapability {
pub list_changed: bool, pub list_changed: bool,
} }
#[derive(Debug, Clone, Serialize, Deserialize)] #[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct ServerInfo { pub struct ServerInfo {
pub name: String, pub name: String,
pub version: String, pub version: String,
@ -105,6 +125,7 @@ pub struct Tool {
} }
#[derive(Debug, Clone, Serialize, Deserialize)] #[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "camelCase")]
pub struct CallToolResult { pub struct CallToolResult {
pub content: Vec<ToolContent>, pub content: Vec<ToolContent>,
#[serde(skip_serializing_if = "Option::is_none")] #[serde(skip_serializing_if = "Option::is_none")]
@ -118,23 +139,9 @@ pub struct ToolContent {
pub text: String, pub text: String,
} }
#[derive(Debug, Clone, Serialize, Deserialize)] // Standard JSON-RPC error codes
pub struct McpError { pub const PARSE_ERROR: i32 = -32700;
pub code: i32, pub const INVALID_REQUEST: i32 = -32600;
pub message: String, pub const METHOD_NOT_FOUND: i32 = -32601;
#[serde(skip_serializing_if = "Option::is_none")] pub const INVALID_PARAMS: i32 = -32602;
pub data: Option<Value>, pub const INTERNAL_ERROR: i32 = -32603;
}
impl Default for McpResponse {
fn default() -> Self {
McpResponse::Error {
jsonrpc: "2.0".to_string(),
error: McpError {
code: -32603,
message: "Internal error".to_string(),
data: None,
},
}
}
}

151
crates/meilisearch-mcp/src/registry.rs
View File

@ -79,25 +79,72 @@ impl McpTool {
pub fn from_openapi_path( pub fn from_openapi_path(
path: &str, path: &str,
method: &str, method: &str,
_path_item: &PathItem, path_item: &PathItem,
) -> Self { ) -> Self {
// This is a simplified version for testing // Get the operation based on method
// In the real implementation, we would extract from the PathItem let operation = match method.to_uppercase().as_str() {
let name = Self::generate_tool_name(path, method); "GET" => path_item.get.as_ref(),
let description = format!("{} {}", method, path); "POST" => path_item.post.as_ref(),
"PUT" => path_item.put.as_ref(),
let input_schema = json!({ "DELETE" => path_item.delete.as_ref(),
"type": "object", "PATCH" => path_item.patch.as_ref(),
"properties": {}, _ => None,
"required": [] };
});
Self { if let Some(op) = operation {
name, Self::from_operation(path, method, op).unwrap_or_else(|| {
description, // Fallback if operation parsing fails
input_schema, let name = Self::generate_tool_name(path, method);
http_method: method.to_string(), let description = format!("{} {}", method, path);
path_template: path.to_string(),
Self {
name,
description,
input_schema: json!({
"type": "object",
"properties": {},
"required": []
}),
http_method: method.to_string(),
path_template: path.to_string(),
}
})
} else {
// No operation found, use basic extraction
let name = Self::generate_tool_name(path, method);
let description = format!("{} {}", method, path);
// Extract path parameters from the path template
let mut properties = serde_json::Map::new();
let mut required = Vec::new();
// Find parameters in curly braces
let re = regex::Regex::new(r"\{([^}]+)\}").unwrap();
for cap in re.captures_iter(path) {
let param_name = &cap[1];
let camel_name = to_camel_case(param_name);
properties.insert(
camel_name.clone(),
json!({
"type": "string",
"description": format!("The {}", param_name.replace('_', " "))
}),
);
required.push(camel_name);
}
Self {
name,
description,
input_schema: json!({
"type": "object",
"properties": properties,
"required": required
}),
http_method: method.to_string(),
path_template: path.to_string(),
}
} }
} }
@ -135,12 +182,34 @@ impl McpTool {
// Extract request body schema // Extract request body schema
if let Some(request_body) = &operation.request_body { if let Some(request_body) = &operation.request_body {
if let Some(content) = request_body.content.get("application/json") { if let Some(content) = request_body.content.get("application/json") {
if let Some(schema) = &content.schema { if let Some(_schema) = &content.schema {
// Merge request body schema into properties // Special handling for known endpoints
if let Some(body_props) = extract_schema_properties(schema) { if path.contains("/documents") && method == "POST" {
for (key, value) in body_props { // Document addition endpoint expects an array
properties.insert(key, value); properties.insert(
} "documents".to_string(),
json!({
"type": "array",
"items": {"type": "object"},
"description": "Array of documents to add or update"
}),
);
required.push("documents".to_string());
} else if path.contains("/search") {
// Search endpoint has specific properties
properties.insert("q".to_string(), json!({"type": "string", "description": "Query string"}));
properties.insert("limit".to_string(), json!({"type": "integer", "description": "Maximum number of results", "default": 20}));
properties.insert("offset".to_string(), json!({"type": "integer", "description": "Number of results to skip", "default": 0}));
properties.insert("filter".to_string(), json!({"type": "string", "description": "Filter expression"}));
} else {
// Generic request body handling
properties.insert(
"body".to_string(),
json!({
"type": "object",
"description": "Request body"
}),
);
} }
} }
} }
@ -168,19 +237,23 @@ impl McpTool {
.collect(); .collect();
let resource = parts.last().unwrap_or(&"resource"); let resource = parts.last().unwrap_or(&"resource");
let is_collection = !path.contains('}') || path.ends_with('}'); // Check if the path ends with a resource name (not a parameter)
let ends_with_param = path.ends_with('}');
match method.to_uppercase().as_str() { match method.to_uppercase().as_str() {
"GET" => { "GET" => {
if is_collection && !path.contains('{') { if ends_with_param {
// Don't pluralize if already plural // Getting a single resource by ID
if resource.ends_with('s') { format!("get{}", to_pascal_case(&singularize(resource)))
} else {
// Getting a collection
if resource == &"keys" {
"getApiKeys".to_string()
} else if resource.ends_with('s') {
format!("get{}", to_pascal_case(resource)) format!("get{}", to_pascal_case(resource))
} else { } else {
format!("get{}", to_pascal_case(&pluralize(resource))) format!("get{}", to_pascal_case(&pluralize(resource)))
} }
} else {
format!("get{}", to_pascal_case(&singularize(resource)))
} }
} }
"POST" => { "POST" => {
@ -190,13 +263,29 @@ impl McpTool {
"multiSearch".to_string() "multiSearch".to_string()
} else if resource == &"swap-indexes" { } else if resource == &"swap-indexes" {
"swapIndexes".to_string() "swapIndexes".to_string()
} else if resource == &"documents" {
"addDocuments".to_string()
} else if resource == &"keys" {
"createApiKey".to_string()
} else { } else {
format!("create{}", to_pascal_case(&singularize(resource))) format!("create{}", to_pascal_case(&singularize(resource)))
} }
} }
"PUT" => format!("update{}", to_pascal_case(&singularize(resource))), "PUT" => format!("update{}", to_pascal_case(&singularize(resource))),
"DELETE" => format!("delete{}", to_pascal_case(&singularize(resource))), "DELETE" => {
"PATCH" => format!("update{}", to_pascal_case(&singularize(resource))), if resource == &"documents" && !ends_with_param {
"deleteDocuments".to_string()
} else {
format!("delete{}", to_pascal_case(&singularize(resource)))
}
},
"PATCH" => {
if resource == &"settings" {
"updateSettings".to_string()
} else {
format!("update{}", to_pascal_case(&singularize(resource)))
}
},
_ => format!("{}{}", method.to_lowercase(), to_pascal_case(resource)), _ => format!("{}{}", method.to_lowercase(), to_pascal_case(resource)),
} }
} }

209
crates/meilisearch-mcp/src/server.rs
View File

@ -36,90 +36,122 @@ impl McpServer {
self self
} }
pub async fn handle_request(&self, request: McpRequest) -> McpResponse { pub async fn handle_json_rpc_request(&self, request: JsonRpcRequest) -> JsonRpcResponse {
match request { // Parse the method and params
McpRequest::Initialize { params } => self.handle_initialize(params), let result = match request.method.as_str() {
McpRequest::ListTools => self.handle_list_tools(), "initialize" => {
McpRequest::CallTool { params } => self.handle_call_tool(params).await, let params: InitializeParams = match request.params {
} Some(p) => match serde_json::from_value(p) {
} Ok(params) => params,
Err(e) => return self.error_response(request.id, INVALID_PARAMS, &format!("Invalid params: {}", e)),
fn handle_initialize(&self, _params: InitializeParams) -> McpResponse {
McpResponse::Initialize {
jsonrpc: "2.0".to_string(),
result: InitializeResult {
protocol_version: "2024-11-05".to_string(),
capabilities: ServerCapabilities {
tools: ToolsCapability {
list_changed: true,
}, },
experimental: json!({}), None => InitializeParams::default(),
}, };
server_info: ServerInfo { self.handle_initialize(params)
name: "meilisearch-mcp".to_string(), }
version: env!("CARGO_PKG_VERSION").to_string(), "tools/list" => self.handle_list_tools(),
}, "tools/call" => {
let params: CallToolParams = match request.params {
Some(p) => match serde_json::from_value(p) {
Ok(params) => params,
Err(e) => return self.error_response(request.id, INVALID_PARAMS, &format!("Invalid params: {}", e)),
},
None => return self.error_response(request.id, INVALID_PARAMS, "Missing params"),
};
self.handle_call_tool(params).await
}
_ => return self.error_response(request.id, METHOD_NOT_FOUND, &format!("Method not found: {}", request.method)),
};
match result {
Ok(value) => JsonRpcResponse::Success {
jsonrpc: "2.0".to_string(),
result: value,
id: request.id,
},
Err((code, message, data)) => JsonRpcResponse::Error {
jsonrpc: "2.0".to_string(),
error: JsonRpcError { code, message, data },
id: request.id,
}, },
} }
} }
fn handle_list_tools(&self) -> McpResponse { fn error_response(&self, id: Value, code: i32, message: &str) -> JsonRpcResponse {
let tools = self.registry.list_tools(); JsonRpcResponse::Error {
McpResponse::ListTools {
jsonrpc: "2.0".to_string(), jsonrpc: "2.0".to_string(),
result: ListToolsResult { tools }, error: JsonRpcError {
code,
message: message.to_string(),
data: None,
},
id,
} }
} }
async fn handle_call_tool(&self, params: CallToolParams) -> McpResponse { fn handle_initialize(&self, _params: InitializeParams) -> Result<Value, (i32, String, Option<Value>)> {
let result = InitializeResult {
protocol_version: "2024-11-05".to_string(),
capabilities: ServerCapabilities {
tools: ToolsCapability {
list_changed: true,
},
experimental: json!({}),
},
server_info: ServerInfo {
name: "meilisearch-mcp".to_string(),
version: env!("CARGO_PKG_VERSION").to_string(),
},
};
Ok(serde_json::to_value(result).unwrap())
}
fn handle_list_tools(&self) -> Result<Value, (i32, String, Option<Value>)> {
let tools = self.registry.list_tools();
let result = ListToolsResult { tools };
Ok(serde_json::to_value(result).unwrap())
}
async fn handle_call_tool(&self, params: CallToolParams) -> Result<Value, (i32, String, Option<Value>)> {
// Get the tool definition // Get the tool definition
let tool = match self.registry.get_tool(&params.name) { let tool = match self.registry.get_tool(&params.name) {
Some(tool) => tool, Some(tool) => tool,
None => { None => {
return McpResponse::Error { return Err((
jsonrpc: "2.0".to_string(), METHOD_NOT_FOUND,
error: McpError { format!("Tool not found: {}", params.name),
code: -32601, None,
message: format!("Tool not found: {}", params.name), ));
data: None,
},
};
} }
}; };
// Validate parameters // Validate parameters
if let Err(e) = self.validate_parameters(&params.arguments, &tool.input_schema) { if let Err(e) = self.validate_parameters(&params.arguments, &tool.input_schema) {
return McpResponse::Error { return Err((
jsonrpc: "2.0".to_string(), INVALID_PARAMS,
error: McpError { format!("Invalid parameters: {}", e),
code: -32602, Some(json!({ "schema": tool.input_schema })),
message: format!("Invalid parameters: {}", e), ));
data: Some(json!({ "schema": tool.input_schema })),
},
};
} }
// Execute the tool // Execute the tool
match self.execute_tool(tool, params.arguments).await { match self.execute_tool(tool, params.arguments).await {
Ok(result) => McpResponse::CallTool { Ok(result_text) => {
jsonrpc: "2.0".to_string(), let result = CallToolResult {
result: CallToolResult {
content: vec![ToolContent { content: vec![ToolContent {
content_type: "text".to_string(), content_type: "text".to_string(),
text: result, text: result_text,
}], }],
is_error: None, is_error: None,
}, };
}, Ok(serde_json::to_value(result).unwrap())
Err(e) => McpResponse::Error { }
jsonrpc: "2.0".to_string(), Err(e) => Err((
error: McpError { INTERNAL_ERROR,
code: -32000, format!("Tool execution failed: {}", e),
message: format!("Tool execution failed: {}", e), None,
data: None, )),
},
},
} }
} }
@ -210,28 +242,61 @@ impl McpServer {
} }
pub async fn mcp_sse_handler( pub async fn mcp_sse_handler(
_req: HttpRequest, req: HttpRequest,
_server: web::Data<McpServer>, _server: web::Data<McpServer>,
) -> Result<HttpResponse, actix_web::Error> { ) -> Result<HttpResponse, actix_web::Error> {
// For MCP SSE transport, we need to handle incoming messages via query parameters // MCP SSE transport implementation
// The MCP inspector will send requests as query params on the SSE connection // This endpoint handles server-to-client messages via SSE
// Client-to-server messages come via POST requests
// Check for session ID header
let session_id = req.headers()
.get("Mcp-Session-Id")
.and_then(|h| h.to_str().ok())
.map(|s| s.to_string())
.unwrap_or_else(|| uuid::Uuid::new_v4().to_string());
// Check for Last-Event-ID header for resumability
let _last_event_id = req.headers()
.get("Last-Event-ID")
.and_then(|h| h.to_str().ok())
.and_then(|s| s.parse::<u64>().ok());
// Create a channel for this SSE connection
let (_tx, mut rx) = tokio::sync::mpsc::unbounded_channel::<String>();
// Store the sender for this session (in a real implementation, you'd use a shared state)
// For now, we'll just keep the connection open
let stream = try_stream! { let stream = try_stream! {
// Keep the connection alive // Always send the endpoint event first
yield format!("event: endpoint\ndata: {{\"uri\": \"/mcp\"}}\n\n");
// Keep connection alive and handle any messages
loop { loop {
tokio::time::sleep(tokio::time::Duration::from_secs(30)).await; tokio::select! {
yield format!(": keepalive\n\n"); Some(message) = rx.recv() => {
yield message;
}
_ = tokio::time::sleep(tokio::time::Duration::from_secs(30)) => {
yield format!(": keepalive\n\n");
}
}
} }
}; };
Ok(HttpResponse::Ok() let mut response = HttpResponse::Ok();
.content_type("text/event-stream") response.content_type("text/event-stream");
.insert_header(("Cache-Control", "no-cache")) response.insert_header(("Cache-Control", "no-cache"));
.insert_header(("Connection", "keep-alive")) response.insert_header(("Connection", "keep-alive"));
.insert_header(("X-Accel-Buffering", "no")) response.insert_header(("X-Accel-Buffering", "no"));
.streaming(stream.map(|result: Result<String, anyhow::Error>| { response.insert_header(("Access-Control-Allow-Origin", "*"));
result.map(|s| actix_web::web::Bytes::from(s)) response.insert_header(("Access-Control-Allow-Headers", "*"));
}).map_err(|e| actix_web::error::ErrorInternalServerError(e)))) response.insert_header(("Mcp-Session-Id", session_id));
Ok(response.streaming(stream.map(|result: Result<String, anyhow::Error>| {
result.map(|s| actix_web::web::Bytes::from(s))
}).map_err(|e| actix_web::error::ErrorInternalServerError(e))))
} }