1 files changed, 69 insertions, 0 deletions
diff --git a/message/message.go b/message/message.go
new file mode 100644
index 0000000..33a18c5
--- /dev/null
+++ b/message/message.go
@@ -0,0 +1,69 @@
+package message
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+// RequestID is used to identify a request.
+type RequestID = string
+
+// SubscriptionID is used to identify a subscription.
+type SubscriptionID = int
+
+// Request represents a JSON-RPC request message.
+// It includes the JSON-RPC version, an identifier for the request, the method
+// to be invoked, and optional parameters.
+type Request struct {
+	JSONRPC string           `json:"jsonrpc"`          // JSON-RPC version, typically "2.0".
+	ID      RequestID        `json:"id"`               // Unique identifier for the request, can be a number or a string.
+	Method  string           `json:"method"`           // The name of the method to be invoked.
+	Params  *json.RawMessage `json:"params,omitempty"` // Optional parameters for the method.
+}
+
+// Response represents a JSON-RPC response message.
+// It includes the JSON-RPC version, an identifier matching the request, the result of the request, and an optional error.
+type Response struct {
+	JSONRPC string           `json:"jsonrpc"`          // JSON-RPC version, typically "2.0".
+	ID      *RequestID       `json:"id,omitempty"`     // Unique identifier matching the request ID, can be null for notifications.
+	Result  *json.RawMessage `json:"result,omitempty"` // Result of the request if it was successful.
+	Error   *Error           `json:"error,omitempty"`  // Error object if the request failed.
+}
+
+// Notification represents a JSON-RPC notification message.
+type Notification struct {
+	JSONRPC string           `json:"jsonrpc"`          // JSON-RPC version, typically "2.0".
+	Method  string           `json:"method"`           // The name of the method to be invoked.
+	Params  *json.RawMessage `json:"params,omitempty"` // Optional parameters for the method.
+}
+
+// NotificationResult represents the result of a subscription notification.
+// It includes the result and the subscription ID that triggered the notification.
+type NotificationResult struct {
+	Result       *json.RawMessage `json:"result,omitempty"` // Result data of the notification.
+	Subscription SubscriptionID   `json:"subscription"`     // ID of the subscription that triggered the notification.
+}
+
+// Error represents an error in a JSON-RPC response.
+// It includes an error code, a message, and optional additional data.
+type Error struct {
+	Code    int              `json:"code"`           // Error code indicating the type of error.
+	Message string           `json:"message"`        // Human-readable error message.
+	Data    *json.RawMessage `json:"data,omitempty"` // Optional additional data about the error.
+}
+
+func (req *Request) String() string {
+	return fmt.Sprintf("{JSONRPC: %s, ID: %s, METHOD: %s, PARAMS: %s}", req.JSONRPC, req.ID, req.Method, *req.Params)
+}
+
+func (res *Response) String() string {
+	return fmt.Sprintf("{JSONRPC: %s, ID: %s, RESULT: %s, ERROR: %v}", res.JSONRPC, *res.ID, *res.Result, res.Error)
+}
+
+func (nt *Notification) String() string {
+	return fmt.Sprintf("{JSONRPC: %s, METHOD: %s, PARAMS: %s}", nt.JSONRPC, nt.Method, *nt.Params)
+}
+
+func (err *Error) String() string {
+	return fmt.Sprintf("{CODE: %d, MESSAGE: %s, DATA: %s}", err.Code, err.Message, *err.Data)
+}