rs-fast-mcp 0.2.0

High-performance, async-first Rust implementation of the Model Context Protocol (MCP)
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89

use crate::mcp::types::{
    ErrorData, JsonRpcError, JsonRpcNotification, JsonRpcRequest, JsonRpcResponse, RequestId,
};
use serde_json::Value;

impl JsonRpcRequest {
    pub fn new(id: RequestId, method: &str, params: Option<Value>) -> Self {
        Self {
            jsonrpc: "2.0".to_string(),
            id,
            method: method.to_string(),
            params,
            transport_metadata: None,
        }
    }
}

impl JsonRpcNotification {
    pub fn new(method: &str, params: Option<Value>) -> Self {
        Self {
            jsonrpc: "2.0".to_string(),
            method: method.to_string(),
            params,
        }
    }
}

impl JsonRpcResponse {
    pub fn new(id: RequestId, result: Value) -> Self {
        Self {
            jsonrpc: "2.0".to_string(),
            id,
            result,
        }
    }
}

impl JsonRpcError {
    pub fn new(id: RequestId, code: i64, message: &str, data: Option<Value>) -> Self {
        Self {
            jsonrpc: "2.0".to_string(),
            id,
            error: ErrorData {
                code,
                message: message.to_string(),
                data,
            },
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::mcp::types::JsonRpcMessage;
    use serde_json::json;

    #[test]
    fn test_request_construction() {
        let req = JsonRpcRequest::new(RequestId::Int(1), "ping", Some(json!({})));
        assert_eq!(req.method, "ping");
        assert_eq!(req.id, RequestId::Int(1));
    }

    #[test]
    fn test_error_construction() {
        let err = JsonRpcError::new(
            RequestId::String("abc".to_string()),
            -32700,
            "Parse error",
            None,
        );
        assert_eq!(err.error.code, -32700);
        assert_eq!(err.error.message, "Parse error");
    }

    #[test]
    fn test_parsing() {
        let json_str = r#"{"jsonrpc": "2.0", "method": "ping", "id": 1}"#;
        let msg: JsonRpcMessage = serde_json::from_str(json_str).unwrap();
        match msg {
            JsonRpcMessage::Request(req) => {
                assert_eq!(req.method, "ping");
                assert_eq!(req.id, RequestId::Int(1));
            }
            _ => panic!("Expected Request"),
        }
    }
}