chore: checkpoint before Python removal

vendor/russh-sftp/src/client/error.rs

@@ -0,0 +1,67 @@
+use std::io;
+use thiserror::Error;
+use tokio::sync::mpsc::error::SendError as MpscSendError;
+use tokio::sync::oneshot::error::RecvError as OneshotRecvError;
+use tokio::time::error::Elapsed as TimeElapsed;
+
+use crate::error;
+use crate::protocol::Status;
+
+/// Enum for client errors
+#[derive(Debug, Clone, Error)]
+pub enum Error {
+    /// Contains an error status packet
+    #[error("{}: {}", .0.status_code, .0.error_message)]
+    Status(Status),
+    /// Any errors related to I/O
+    #[error("I/O: {0}")]
+    IO(String),
+    /// Time limit for receiving response packet exceeded
+    #[error("Timeout")]
+    Timeout,
+    /// Occurs due to exceeding the limits set by the `limits@openssh.com` extension
+    #[error("Limit exceeded: {0}")]
+    Limited(String),
+    /// Occurs when an unexpected packet is sent
+    #[error("Unexpected packet")]
+    UnexpectedPacket,
+    /// Occurs when unexpected server behavior differs from the protocol specifition
+    #[error("{0}")]
+    UnexpectedBehavior(String),
+}
+
+impl From<Status> for Error {
+    fn from(status: Status) -> Self {
+        Self::Status(status)
+    }
+}
+
+impl From<io::Error> for Error {
+    fn from(error: io::Error) -> Self {
+        Self::IO(error.to_string())
+    }
+}
+
+impl<T> From<MpscSendError<T>> for Error {
+    fn from(err: MpscSendError<T>) -> Self {
+        Self::UnexpectedBehavior(format!("SendError: {}", err))
+    }
+}
+
+impl From<OneshotRecvError> for Error {
+    fn from(err: OneshotRecvError) -> Self {
+        Self::UnexpectedBehavior(format!("RecvError: {}", err))
+    }
+}
+
+impl From<TimeElapsed> for Error {
+    fn from(_: TimeElapsed) -> Self {
+        Self::Timeout
+    }
+}
+
+impl From<error::Error> for Error {
+    fn from(error: error::Error) -> Self {
+        Self::UnexpectedBehavior(error.to_string())
+    }
+}