feat: Add TCP socket support

example/Cargo.toml

@@ -23,7 +23,7 @@ ctrlc = { version = "3.0", features = ["termination"] }
 tokio = { version = "1.0.1", features = ["signal", "time"] }
 async-trait = "0.1.42"
 rand = "0.8.5"
-
+clap = { version = "4.5.40", features = ["derive"] }
 
 [[example]]
 name = "client"

example/async-client.rs

@@ -11,7 +11,9 @@ use ttrpc::r#async::Client;
 
 #[tokio::main(flavor = "current_thread")]
 async fn main() {
-    let c = Client::connect(utils::SOCK_ADDR).await.unwrap();
+    let sock_addr = utils::get_sock_addr();
+    let c = Client::connect(sock_addr).await.unwrap();
+
     let hc = health_ttrpc::HealthClient::new(c.clone());
     let ac = agent_ttrpc::AgentServiceClient::new(c);
 

example/async-server.rs

@@ -58,10 +58,11 @@ async fn main() {
     let hservice = health_ttrpc::create_health(Arc::new(HealthService {}));
     let aservice = agent_ttrpc::create_agent_service(Arc::new(AgentService {}));
 
-    utils::remove_if_sock_exist(utils::SOCK_ADDR).unwrap();
+    let sock_addr = utils::get_sock_addr();
+    utils::remove_if_sock_exist(sock_addr).unwrap();
 
     let mut server = Server::new()
-        .bind(utils::SOCK_ADDR)
+        .bind(sock_addr)
         .unwrap()
         .register_service(hservice)
         .register_service(aservice);

example/async-stream-client.rs

@@ -13,7 +13,9 @@ use ttrpc::r#async::Client;
 async fn main() {
     simple_logging::log_to_stderr(log::LevelFilter::Info);
 
-    let c = Client::connect(utils::SOCK_ADDR).await.unwrap();
+    let sock_addr = utils::get_sock_addr();
+    let c = Client::connect(sock_addr).await.unwrap();
+
     let sc = streaming_ttrpc::StreamingClient::new(c);
 
     let _now = std::time::Instant::now();

example/async-stream-server.rs

@@ -171,10 +171,12 @@ impl streaming_ttrpc::Streaming for StreamingService {
 async fn main() {
     simple_logging::log_to_stderr(LevelFilter::Info);
     let service = streaming_ttrpc::create_streaming(Arc::new(StreamingService {}));
-    utils::remove_if_sock_exist(utils::SOCK_ADDR).unwrap();
+
+    let sock_addr = utils::get_sock_addr();
+    utils::remove_if_sock_exist(sock_addr).unwrap();
 
     let mut server = Server::new()
-        .bind(utils::SOCK_ADDR)
+        .bind(sock_addr)
         .unwrap()
         .register_service(service);
 

example/client.rs

@@ -50,7 +50,9 @@ fn main() {
 fn connect_once() {
     simple_logging::log_to_stderr(LevelFilter::Trace);
 
-    let c = Client::connect(utils::SOCK_ADDR).unwrap();
+    let sock_addr = utils::get_sock_addr();
+    let c = Client::connect(sock_addr).unwrap();
+
     let hc = health_ttrpc::HealthClient::new(c.clone());
     let ac = agent_ttrpc::AgentServiceClient::new(c);
 

example/server.rs

@@ -58,9 +58,11 @@ fn main() {
     let hservice = health_ttrpc::create_health(Arc::new(HealthService {}));
     let aservice = agent_ttrpc::create_agent_service(Arc::new(AgentService {}));
 
-    utils::remove_if_sock_exist(utils::SOCK_ADDR).unwrap();
+    let sock_addr = utils::get_sock_addr();
+    utils::remove_if_sock_exist(sock_addr).unwrap();
+
     let mut server = ttrpc::Server::new()
-        .bind(utils::SOCK_ADDR)
+        .bind(sock_addr)
         .unwrap()
         .register_service(hservice)
         .register_service(aservice);

example/utils.rs

@@ -1,14 +1,42 @@
 #![allow(dead_code)]
+use clap::Parser;
+use log::warn;
 use std::io::Result;
 
 #[cfg(unix)]
-pub const SOCK_ADDR: &str = r"unix:///tmp/ttrpc-test";
+pub const SOCK_ADDR_LOCAL: &str = r"unix:///tmp/ttrpc-test";
 
 #[cfg(windows)]
-pub const SOCK_ADDR: &str = r"\\.\pipe\ttrpc-test";
+pub const SOCK_ADDR_LOCAL: &str = r"\\.\pipe\ttrpc-test";
+
+pub const SOCK_ADDR_TCP: &str = r"tcp://127.0.0.1:65500";
+
+#[derive(Debug, Default, Parser)]
+pub struct Cli {
+    #[arg(long = "tcp")]
+    #[arg(help = "Use a TCP socket instead of a local one")]
+    pub tcp: bool,
+}
+
+pub fn get_sock_addr() -> &'static str {
+    let cli = Cli::parse();
+    if cli.tcp {
+        if cfg!(windows) {
+            warn!("'--tcp' flag ignored; TCP sockets not supported on Windows");
+            return SOCK_ADDR_LOCAL;
+        }
+        SOCK_ADDR_TCP
+    } else {
+        SOCK_ADDR_LOCAL
+    }
+}
 
 #[cfg(unix)]
 pub fn remove_if_sock_exist(sock_addr: &str) -> Result<()> {
+    if sock_addr.starts_with("tcp://") {
+        return Ok(());
+    }
+
     let path = sock_addr
         .strip_prefix("unix://")
         .expect("socket address is not expected");

src/asynchronous/server.rs

@@ -101,6 +101,15 @@ impl Server {
         Ok(self.add_listener(listener))
     }
 
+    #[cfg(unix)]
+    /// # Safety
+    /// The file descriptor must represent a unix listener.
+    pub unsafe fn add_tcp_listener(self, fd: RawFd) -> Result<Server> {
+        let listener = Listener::from_raw_tcp_listener_fd(fd)
+            .map_err(err_to_others_err!(e, "from_raw_tcp_listener_fd error"))?;
+        Ok(self.add_listener(listener))
+    }
+
     #[cfg(any(target_os = "linux", target_os = "android"))]
     /// # Safety
     /// The file descriptor must represent a vsock listener.

src/asynchronous/transport/mod.rs

@@ -22,6 +22,9 @@ macro_rules! io_other {
 #[cfg(unix)]
 mod unix;
 
+#[cfg(unix)]
+mod tcp;
+
 #[cfg(any(target_os = "linux", target_os = "android"))]
 mod vsock;
 
@@ -43,6 +46,11 @@ impl Listener {
             return Self::bind_unix(addr);
         }
 
+        #[cfg(unix)]
+        if let Some(addr) = addr.strip_prefix("tcp://") {
+            return Self::bind_tcp(addr);
+        }
+
         #[cfg(any(target_os = "linux", target_os = "android"))]
         if let Some(addr) = addr.strip_prefix("vsock://") {
             return Self::bind_vsock(addr);
@@ -70,6 +78,11 @@ impl Socket {
             return Self::connect_unix(addr).await;
         }
 
+        #[cfg(unix)]
+        if let Some(addr) = addr.strip_prefix("tcp://") {
+            return Self::connect_tcp(addr).await;
+        }
+
         #[cfg(any(target_os = "linux", target_os = "android"))]
         if let Some(addr) = addr.strip_prefix("vsock://") {
             return Self::connect_vsock(addr).await;

src/asynchronous/transport/tcp.rs

@@ -0,0 +1,80 @@
+use std::convert::TryFrom;
+use std::io::{Error as IoError, Result as IoResult};
+use std::os::fd::{FromRawFd as _, RawFd};
+use std::net::{
+    SocketAddr, TcpListener as StdTcpListener, TcpStream as StdTcpStream,
+};
+
+use async_stream::stream;
+use tokio::net::{TcpListener, TcpStream};
+
+use super::{Listener, Socket};
+
+impl Listener {
+    pub fn bind_tcp(addr: impl AsRef<str>) -> IoResult<Self> {
+        let addr = parse_tcp_addr(addr)?;
+        let listener = StdTcpListener::bind(addr)?;
+        Self::try_from(listener)
+    }
+
+    /// # Safety
+    /// The file descriptor must represent a tcp listener.
+    pub unsafe fn from_raw_tcp_listener_fd(fd: std::os::fd::RawFd) -> IoResult<Self> {
+        let listener = unsafe { StdTcpListener::from_raw_fd(fd) };
+        Self::try_from(listener)
+    }
+}
+
+impl Socket {
+    pub async fn connect_tcp(addr: impl AsRef<str>) -> IoResult<Self> {
+        let addr = parse_tcp_addr(addr)?;
+        let socket = StdTcpStream::connect(addr)?;
+        Self::try_from(socket)
+    }
+
+    /// # Safety
+    /// The file descriptor must represent a tcp socket.
+    pub unsafe fn from_raw_tcp_socket_fd(fd: RawFd) -> IoResult<Self> {
+        let socket = unsafe { StdTcpStream::from_raw_fd(fd) };
+        Self::try_from(socket)
+    }
+}
+
+impl From<TcpListener> for Listener {
+    fn from(listener: TcpListener) -> Self {
+        Self::new(stream! {
+            loop {
+                yield listener.accept().await.map(|(socket, _)| socket);
+            }
+        })
+    }
+}
+
+impl TryFrom<StdTcpListener> for Listener {
+    type Error = IoError;
+    fn try_from(listener: StdTcpListener) -> IoResult<Self> {
+        listener.set_nonblocking(true)?;
+        Ok(Self::from(TcpListener::from_std(listener)?))
+    }
+}
+
+impl From<TcpStream> for Socket {
+    fn from(socket: TcpStream) -> Self {
+        Self::new(socket)
+    }
+}
+
+impl TryFrom<StdTcpStream> for Socket {
+    type Error = IoError;
+    fn try_from(socket: StdTcpStream) -> IoResult<Self> {
+        socket.set_nonblocking(true)?;
+        Ok(Self::from(TcpStream::from_std(socket)?))
+    }
+}
+
+fn parse_tcp_addr(addr: impl AsRef<str>) -> IoResult<SocketAddr> {
+    let addr = addr.as_ref();
+
+    addr.parse::<SocketAddr>()
+        .map_err(|e| io_other!("Failed to parse TCP address '{}': {}", addr, e))
+}