feat(shadowsocks): add more Debug implementations (shadowsocks#1656)

Most implementations are derived.

I would like to add `missing_debug_implementations` lint,
but before deriving more Debug implementations
we need to add Debug implementations to types exported
from `shadowsocks-crypto`.

Author: link2xt

crates/shadowsocks/src/context.rs

@@ -13,6 +13,7 @@ use crate::{
 };
 
 /// Service context
+#[derive(Debug)]
 pub struct Context {
     // Protector against replay attack
     // The actual replay detection behavior is implemented in ReplayProtector

crates/shadowsocks/src/dns_resolver/resolver.rs

@@ -38,6 +38,7 @@ pub trait DnsResolve {
 }
 
 #[cfg(feature = "hickory-dns")]
+#[derive(Debug)]
 pub struct HickoryDnsSystemResolver {
     resolver: ArcSwap<HickoryDnsResolver>,
     #[cfg_attr(any(windows, target_os = "android"), allow(dead_code))]

crates/shadowsocks/src/manager/datagram.rs

@@ -46,6 +46,7 @@ impl fmt::Display for ManagerSocketAddr {
 /// Datagram socket for manager
 ///
 /// For *nix system, this is a wrapper for both UDP socket and Unix socket
+#[derive(Debug)]
 pub enum ManagerDatagram {
     UdpDatagram(UdpSocket),
     #[cfg(unix)]

crates/shadowsocks/src/manager/listener.rs

@@ -13,6 +13,7 @@ use super::{
 };
 
 /// Manager server Listener
+#[derive(Debug)]
 pub struct ManagerListener {
     socket: ManagerDatagram,
 }

crates/shadowsocks/src/net/tcp.rs

@@ -121,6 +121,7 @@ impl AsyncWrite for TcpStream {
 }
 
 /// `TcpListener` for accepting inbound connections
+#[derive(Debug)]
 pub struct TcpListener {
     inner: TokioTcpListener,
     accept_opts: AcceptOpts,

crates/shadowsocks/src/net/udp.rs

@@ -85,6 +85,7 @@ fn make_mtu_error(packet_size: usize, mtu: usize) -> io::Error {
 }
 
 /// Wrappers for outbound `UdpSocket`
+#[derive(Debug)]
 #[pin_project]
 pub struct UdpSocket {
     #[pin]

crates/shadowsocks/src/plugin/mod.rs

@@ -58,6 +58,7 @@ pub enum PluginMode {
 }
 
 /// A shadowsocks SIP004 Plugin
+#[derive(Debug)]
 pub struct Plugin {
     process: Child,
     local_addr: SocketAddr,

crates/shadowsocks/src/relay/tcprelay/aead.rs

@@ -80,6 +80,7 @@ impl From<ProtocolError> for io::Error {
     }
 }
 
+#[derive(Debug)]
 enum DecryptReadState {
     WaitSalt { key: Bytes },
     ReadLength,
@@ -320,6 +321,7 @@ impl DecryptedReader {
     }
 }
 
+#[derive(Debug)]
 enum EncryptWriteState {
     AssemblePacket,
     Writing { pos: usize },

crates/shadowsocks/src/relay/tcprelay/crypto_io.rs

@@ -1,7 +1,7 @@
 //! IO facilities for TCP relay
 
 use std::{
-    io,
+    fmt, io,
     marker::Unpin,
     pin::Pin,
     sync::Arc,
@@ -313,6 +313,15 @@ pub struct CryptoStream<S> {
     has_handshaked: bool,
 }
 
+impl<S> fmt::Debug for CryptoStream<S> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("CryptoStream")
+            .field("method", &self.method)
+            .field("has_handshaked", &self.has_handshaked)
+            .finish()
+    }
+}
+
 impl<S> CryptoStream<S> {
     /// Create a new CryptoStream with the underlying stream connection
     pub fn from_stream(

crates/shadowsocks/src/relay/tcprelay/proxy_listener.rs

@@ -17,6 +17,7 @@ use crate::{
 };
 
 /// A TCP listener for accepting shadowsocks' client connection
+#[derive(Debug)]
 pub struct ProxyListener {
     listener: TcpListener,
     method: CipherKind,