add mcp (Model Context Protocol) support

pkg/core/json_rpc.go

@@ -0,0 +1,95 @@
+package core
+
+import "encoding/json"
+
+// JSONRPCVersion defines the version of JSON-RPC protocol
+const JSONRPCVersion = "2.0"
+
+// JSONRPCRequest represents the JSON-RPC 2.0 request
+type JSONRPCRequest struct {
+	JSONRPC string          `json:"jsonrpc"`
+	Method  string          `json:"method"`
+	Params  json.RawMessage `json:"params,omitempty"`
+	ID      any             `json:"id,omitempty"`
+}
+
+// JSONRPCResponse represents the JSON-RPC 2.0 response
+type JSONRPCResponse struct {
+	JSONRPC string        `json:"jsonrpc"`
+	Result  any           `json:"result,omitempty"`
+	Error   *JSONRPCError `json:"error,omitempty"`
+	ID      any           `json:"id,omitempty"`
+}
+
+// JSONRPCError represents the JSON-RPC 2.0 error object
+type JSONRPCError struct {
+	Code    int    `json:"code"`
+	Message string `json:"message"`
+	Data    any    `json:"data,omitempty"`
+}
+
+// JSONRPCParseError represents the "Parse error" in JSON-RPC 2.0
+var JSONRPCParseError = &JSONRPCError{
+	Code:    -32700,
+	Message: "Parse error",
+	Data:    nil,
+}
+
+// JSONRPCMethodNotFoundError represents the "Method not found" error in JSON-RPC 2.0
+var JSONRPCMethodNotFoundError = &JSONRPCError{
+	Code:    -32601,
+	Message: "Method not found",
+	Data:    nil,
+}
+
+// JSONRPCInvalidParamsError represents the "Invalid params" error in JSON-RPC 2.0
+var JSONRPCInvalidParamsError = &JSONRPCError{
+	Code:    -32602,
+	Message: "Invalid params",
+	Data:    nil,
+}
+
+// JSONRPCInternalError represents the "Internal error" in JSON-RPC 2.0
+var JSONRPCInternalError = &JSONRPCError{
+	Code:    -32603,
+	Message: "Internal error",
+	Data:    nil,
+}
+
+// NewJSONRPCResponse creates a new JSON-RPC response with the result
+func NewJSONRPCResponse(id any, result any) *JSONRPCResponse {
+	return &JSONRPCResponse{
+		JSONRPC: JSONRPCVersion,
+		Result:  result,
+		Error:   nil,
+		ID:      id,
+	}
+}
+
+// NewJSONRPCErrorResponse creates a new JSON-RPC error response
+func NewJSONRPCErrorResponse(id any, err *JSONRPCError) *JSONRPCResponse {
+	return &JSONRPCResponse{
+		JSONRPC: JSONRPCVersion,
+		Result:  nil,
+		Error: &JSONRPCError{
+			Code:    err.Code,
+			Message: err.Message,
+			Data:    nil,
+		},
+		ID: id,
+	}
+}
+
+// NewJSONRPCErrorResponseWithCause creates a new JSON-RPC error response
+func NewJSONRPCErrorResponseWithCause(id any, err *JSONRPCError, cause string) *JSONRPCResponse {
+	return &JSONRPCResponse{
+		JSONRPC: JSONRPCVersion,
+		Result:  nil,
+		Error: &JSONRPCError{
+			Code:    err.Code,
+			Message: err.Message,
+			Data:    cause,
+		},
+		ID: id,
+	}
+}