agentic-vision-mcp 0.2.4

MCP server for AgenticVision — universal LLM access to persistent visual memory
Documentation 
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//! JSON-RPC 2.0 message types for the MCP protocol.

use serde::{Deserialize, Serialize};
use serde_json::Value;

/// JSON-RPC 2.0 protocol version.
pub const JSONRPC_VERSION: &str = "2.0";

/// Unique request identifier — can be string, number, or null.
#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
#[serde(untagged)]
pub enum RequestId {
    String(String),
    Number(i64),
    Null,
}

impl std::fmt::Display for RequestId {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            RequestId::String(s) => write!(f, "{s}"),
            RequestId::Number(n) => write!(f, "{n}"),
            RequestId::Null => write!(f, "null"),
        }
    }
}

/// A JSON-RPC 2.0 request message.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct JsonRpcRequest {
    pub jsonrpc: String,
    pub id: RequestId,
    pub method: String,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub params: Option<Value>,
}

/// A JSON-RPC 2.0 success response.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct JsonRpcResponse {
    pub jsonrpc: String,
    pub id: RequestId,
    pub result: Value,
}

/// A JSON-RPC 2.0 error response.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct JsonRpcError {
    pub jsonrpc: String,
    pub id: RequestId,
    pub error: JsonRpcErrorObject,
}

/// Error object within a JSON-RPC error response.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct JsonRpcErrorObject {
    pub code: i32,
    pub message: String,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub data: Option<Value>,
}

/// A JSON-RPC 2.0 notification (no id, no response expected).
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct JsonRpcNotification {
    pub jsonrpc: String,
    pub method: String,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub params: Option<Value>,
}

/// Union type for any JSON-RPC message.
#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(untagged)]
pub enum JsonRpcMessage {
    Request(JsonRpcRequest),
    Response(JsonRpcResponse),
    Error(JsonRpcError),
    Notification(JsonRpcNotification),
}

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

impl JsonRpcError {
    pub fn new(id: RequestId, code: i32, message: String) -> Self {
        Self {
            jsonrpc: JSONRPC_VERSION.to_string(),
            id,
            error: JsonRpcErrorObject {
                code,
                message,
                data: None,
            },
        }
    }
}

impl JsonRpcNotification {
    pub fn new(method: String, params: Option<Value>) -> Self {
        Self {
            jsonrpc: JSONRPC_VERSION.to_string(),
            method,
            params,
        }
    }
}