Use AgentError instead of associated Error type

Signed-off-by: Wiktor Kwapisiewicz <[email protected]>

README.md

@@ -15,15 +15,14 @@ use async_trait::async_trait;
 use tokio::net::UnixListener;
 
 use ssh_agent_lib::agent::Agent;
+use ssh_agent_lib::error::AgentError;
 use ssh_agent_lib::proto::message::{Message, SignRequest};
 
 struct MyAgent;
 
 #[async_trait]
 impl Agent for MyAgent {
-    type Error = ();
-
-    async fn handle(&self, message: Message) -> Result<Message, ()> {
+    async fn handle(&self, message: Message) -> Result<Message, AgentError> {
         match message {
             Message::SignRequest(request) => {
                 // get the signature by signing `request.data`

examples/key_storage.rs

@@ -3,6 +3,7 @@ use log::info;
 use tokio::net::UnixListener;
 
 use ssh_agent_lib::agent::Agent;
+use ssh_agent_lib::error::AgentError;
 use ssh_agent_lib::proto::message::{self, Message, SignRequest};
 use ssh_agent_lib::proto::private_key::{PrivateKey, RsaPrivateKey};
 use ssh_agent_lib::proto::public_key::PublicKey;
@@ -147,9 +148,7 @@ impl KeyStorage {
 
 #[async_trait]
 impl Agent for KeyStorage {
-    type Error = ();
-
-    async fn handle(&self, message: Message) -> Result<Message, ()> {
+    async fn handle(&self, message: Message) -> Result<Message, AgentError> {
         self.handle_message(message).or_else(|error| {
             println!("Error handling message - {:?}", error);
             Ok(Message::Failure)

src/agent.rs

@@ -7,7 +7,6 @@ use tokio::io::{AsyncRead, AsyncWrite};
 use tokio::net::{TcpListener, TcpStream, UnixListener, UnixStream};
 use tokio_util::codec::{Decoder, Encoder, Framed};
 
-use std::error::Error;
 use std::fmt;
 use std::io;
 use std::marker::Unpin;
@@ -111,11 +110,9 @@ impl ListeningSocket for TcpListener {
 
 #[async_trait]
 pub trait Agent: 'static + Sync + Send + Sized {
-    type Error: fmt::Debug + Send + Sync;
+    async fn handle(&self, message: Message) -> Result<Message, AgentError>;
 
-    async fn handle(&self, message: Message) -> Result<Message, Self::Error>;
-
-    async fn listen<S>(self, socket: S) -> Result<(), Box<dyn Error + Send + Sync>>
+    async fn listen<S>(self, socket: S) -> Result<(), AgentError>
     where
         S: ListeningSocket + fmt::Debug + Send,
     {
@@ -136,7 +133,7 @@ pub trait Agent: 'static + Sync + Send + Sized {
                 }
                 Err(e) => {
                     error!("Failed to accept socket; error = {:?}", e);
-                    return Err(Box::new(e));
+                    return Err(AgentError::IO(e));
                 }
             }
         }