Add error struct for LdkServerError.

Author: G8XSU

server/src/api/error.rs

@@ -0,0 +1,25 @@
+pub(crate) struct LdkServerError {
+	// The error message containing a generic description of the error condition in English.
+	// It is intended for a human audience only and should not be parsed to extract any information
+	// programmatically. Client-side code may use it for logging only.
+	pub(crate) message: String,
+
+	// The error code uniquely identifying an error condition.
+	// It is meant to be read and understood programmatically by code that detects/handles errors by
+	// type.
+	pub(crate) error_code: LdkServerErrorCode,
+}
+
+pub(crate) enum LdkServerErrorCode {
+	/// Please refer to [`protos::error::ErrorCode::InvalidRequestError`].
+	InvalidRequestError,
+
+	/// Please refer to [`protos::error::ErrorCode::AuthError`].
+	AuthError,
+
+	/// Please refer to [`protos::error::ErrorCode::LightningError`].
+	LightningError,
+
+	/// Please refer to [`protos::error::ErrorCode::InternalServerError`].
+	InternalServerError,
+}

server/src/api/mod.rs

@@ -3,6 +3,7 @@ pub(crate) mod bolt11_send;
 pub(crate) mod bolt12_receive;
 pub(crate) mod bolt12_send;
 pub(crate) mod close_channel;
+pub(crate) mod error;
 pub(crate) mod get_node_info;
 pub(crate) mod get_payment_details;
 pub(crate) mod list_channels;