wip: implementing message handler

rpxy-lib/src/message_handle/http_result.rs

@@ -0,0 +1,36 @@
+use http::StatusCode;
+use thiserror::Error;
+
+/// HTTP result type, T is typically a hyper::Response
+/// HttpError is used to generate a synthetic error response
+pub(crate) type HttpResult<T> = std::result::Result<T, HttpError>;
+
+/// Describes things that can go wrong in the forwarder
+#[derive(Debug, Error)]
+pub enum HttpError {
+  #[error("No host is give nin request header")]
+  NoHostInRequestHeader,
+  #[error("Invalid host in request header")]
+  InvalidHostInRequestHeader,
+  #[error("SNI and Host header mismatch")]
+  SniHostInconsistency,
+  #[error("No matching backend app")]
+  NoMatchingBackendApp,
+  #[error("Failed to redirect: {0}")]
+  FailedToRedirect(String),
+
+  #[error(transparent)]
+  Other(#[from] anyhow::Error),
+}
+
+impl From<HttpError> for StatusCode {
+  fn from(e: HttpError) -> StatusCode {
+    match e {
+      HttpError::NoHostInRequestHeader => StatusCode::BAD_REQUEST,
+      HttpError::InvalidHostInRequestHeader => StatusCode::BAD_REQUEST,
+      HttpError::SniHostInconsistency => StatusCode::MISDIRECTED_REQUEST,
+      HttpError::NoMatchingBackendApp => StatusCode::SERVICE_UNAVAILABLE,
+      _ => StatusCode::INTERNAL_SERVER_ERROR,
+    }
+  }
+}