feat(protocol): ServerConfig + ConfigError + RpcErrorCode

crates/xy-protocol/src/error.rs

@@ -0,0 +1,37 @@
+use std::path::PathBuf;
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum ConfigError {
+    #[error("failed to read {path}: {source}")]
+    Io { path: PathBuf, #[source] source: std::io::Error },
+
+    #[error("failed to parse KDL in {path}: {message}")]
+    Parse { path: PathBuf, message: String },
+
+    #[error("missing required field `{field}` in {path}")]
+    MissingField { path: PathBuf, field: &'static str },
+
+    #[error("invalid value for `{field}` in {path}: {message}")]
+    InvalidValue { path: PathBuf, field: &'static str, message: String },
+
+    #[error("duplicate port {port} declared by both `{name_a}` and `{name_b}`")]
+    DuplicatePort { name_a: String, name_b: String, port: u16 },
+
+    #[error("server name `{name}` contains invalid characters (allowed: a-z, 0-9, '-', '_')")]
+    InvalidName { name: String },
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum RpcErrorCode {
+    ServerNotFound = -32001,
+    PortConflict = -32002,
+    ConfigInvalid = -32003,
+    AlreadyRunning = -32004,
+    NotRunning = -32005,
+    SpawnFailed = -32006,
+}
+
+impl RpcErrorCode {
+    pub fn as_i32(self) -> i32 { self as i32 }
+}