feat!: Use RTITIT instead of async-trait

Author: oblique

Diff for: Cargo.toml

@@ -2,7 +2,8 @@
 name = "async-tftp"
 version = "0.3.6"
 authors = ["oblique <psyberbits@gmail.com>"]
-edition = "2018"
+edition = "2021"
+rust-version = "1.75"
 license = "MIT"
 readme = "README.md"
 
@@ -20,7 +21,6 @@ thiserror = "1.0.48"
 async-executor = "1.5.1"
 async-io = "1.13.0"
 async-lock = "2.8.0"
-async-trait = "0.1.73"
 blocking = "1.3.1"
 futures-lite = "1.13.0"
 

Diff for: examples/tftpd-targz.rs

@@ -29,7 +29,6 @@ fn strip_path_prefixes(path: &Path) -> &Path {
     path.strip_prefix("/").or_else(|_| path.strip_prefix("./")).unwrap_or(path)
 }
 
-#[async_tftp::async_trait]
 impl Handler for TftpdTarGzHandler {
     type Reader = Entry<Archive<GzipDecoder<BufReader<File>>>>;
     type Writer = Sink;

Diff for: src/lib.rs

@@ -67,6 +67,3 @@ mod tests;
 mod utils;
 
 pub use crate::error::*;
-
-/// Re-export of `async_trait:async_trait`.
-pub use async_trait::async_trait;

Diff for: src/server/handler.rs

@@ -1,27 +1,28 @@
 use futures_lite::{AsyncRead, AsyncWrite};
+use std::future::Future;
 use std::net::SocketAddr;
 use std::path::Path;
 
 use crate::packet;
 
 /// Trait for implementing advance handlers.
-#[crate::async_trait]
 pub trait Handler: Send {
     type Reader: AsyncRead + Unpin + Send + 'static;
     type Writer: AsyncWrite + Unpin + Send + 'static;
 
     /// Open `Reader` to serve a read request.
-    async fn read_req_open(
+    fn read_req_open(
         &mut self,
         client: &SocketAddr,
         path: &Path,
-    ) -> Result<(Self::Reader, Option<u64>), packet::Error>;
+    ) -> impl Future<Output = Result<(Self::Reader, Option<u64>), packet::Error>>
+           + Send;
 
     /// Open `Writer` to serve a write request.
-    async fn write_req_open(
+    fn write_req_open(
         &mut self,
         client: &SocketAddr,
         path: &Path,
         size: Option<u64>,
-    ) -> Result<Self::Writer, packet::Error>;
+    ) -> impl Future<Output = Result<Self::Writer, packet::Error>> + Send;
 }

Diff for: src/server/handlers/dir.rs

@@ -59,7 +59,6 @@ impl DirHandler {
     }
 }
 
-#[crate::async_trait]
 impl crate::server::Handler for DirHandler {
     type Reader = Unblock<File>;
     type Writer = Unblock<File>;

Diff for: src/tests/handlers.rs

@@ -24,7 +24,6 @@ impl RandomHandler {
     }
 }
 
-#[crate::async_trait]
 impl Handler for RandomHandler {
     type Reader = RandomFile;
     type Writer = Sink;