refactor(irtt-client): modularize client components

crates/irtt-client/src/error.rs

@@ -0,0 +1,40 @@
+use std::{io, time::Duration};
+
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum ClientError {
+    #[error("failed to resolve server address {addr:?}")]
+    Resolve { addr: String },
+    #[error("socket error: {0}")]
+    Socket(#[from] io::Error),
+    #[error("protocol error: {0}")]
+    Protocol(#[from] irtt_proto::ProtoError),
+    #[error("all open requests timed out")]
+    OpenTimeout,
+    #[error("open timeout {timeout:?} is below the minimum {minimum:?}")]
+    OpenTimeoutTooSmall {
+        timeout: Duration,
+        minimum: Duration,
+    },
+    #[error("server rejected the open request")]
+    ServerRejected,
+    #[error("unexpected no-test open reply")]
+    UnexpectedNoTestReply,
+    #[error("no-test reply included a non-zero connection token: {token}")]
+    NonZeroNoTestToken { token: u64 },
+    #[error("protocol version mismatch: requested {requested}, received {received}")]
+    ProtocolVersionMismatch { requested: i64, received: i64 },
+    #[error("server returned a zero connection token")]
+    ZeroToken,
+    #[error("strict negotiation rejected changed params: {reason}")]
+    NegotiationRejected { reason: String },
+    #[error("client is not open")]
+    NotOpen,
+    #[error("client session is already closed")]
+    AlreadyClosed,
+    #[error("operation is not implemented for this milestone")]
+    NotImplementedForMilestone,
+    #[error("duration is too large to encode as nanoseconds")]
+    DurationOverflow,
+}