better frame parsing and handling

amqp_transport/src/error.rs

@@ -0,0 +1,30 @@
+#[derive(Debug, thiserror::Error)]
+pub enum ConError {
+    #[error("{0}")]
+    Invalid(#[from] ProtocolError),
+    #[error("connection error: `{0}`")]
+    Other(#[from] anyhow::Error),
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum ProtocolError {
+    #[error("fatal error")]
+    Fatal,
+    #[error("{0}")]
+    ConException(#[from] ConException),
+    #[error("{0}")]
+    ChannelException(#[from] ChannelException),
+    #[error("closing connection")]
+    OtherCloseConnection,
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum ConException {
+    #[error("501 Frame error")]
+    FrameError,
+    #[error("503 Command invalid")]
+    CommandInvalid,
+}
+
+#[derive(Debug, thiserror::Error)]
+pub enum ChannelException {}