ofp13: converted to async with tokio;

I haven't tested yet; Just waiting for ofp10 to convert to async.

Cargo.lock

@@ -2,6 +2,21 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "addr2line"
+version = "0.24.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dfbe277e56a376000877090da837660b4427aad530e3028d44e0bffe4f89a1c1"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler2"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "512761e0bb2578dd7380c6baaa0f4ce03e84f95e960231d1dec8bf4d7d6e2627"
+
 [[package]]
 name = "anstream"
 version = "0.6.15"
@@ -51,12 +66,51 @@ dependencies = [
  "windows-sys",
 ]
 
+[[package]]
+name = "autocfg"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26"
+
+[[package]]
+name = "backtrace"
+version = "0.3.74"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8d82cb332cdfaed17ae235a638438ac4d4839913cc2af585c3c6746e8f8bee1a"
+dependencies = [
+ "addr2line",
+ "cfg-if",
+ "libc",
+ "miniz_oxide",
+ "object",
+ "rustc-demangle",
+ "windows-targets",
+]
+
+[[package]]
+name = "bitflags"
+version = "2.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b048fb63fd8b5923fc5aa7b340d8e156aec7ec02f0c78fa8a6ddc2613f6f71de"
+
 [[package]]
 name = "byteorder"
 version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
 
+[[package]]
+name = "bytes"
+version = "1.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "428d9aa8fbc0670b7b8d6030a7fadd0f86151cae55e4dbbece15f3780a3dfaf3"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
 [[package]]
 name = "clap"
 version = "4.5.16"
@@ -112,18 +166,111 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d3fd119d74b830634cea2a0f58bbd0d54540518a14397557951e79340abc28c0"
 
+[[package]]
+name = "gimli"
+version = "0.31.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07e28edb80900c19c28f1072f2e8aeca7fa06b23cd4169cefe1af5aa3260783f"
+
 [[package]]
 name = "heck"
 version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
+[[package]]
+name = "hermit-abi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d231dfb89cfffdbc30e7fc41579ed6066ad03abda9e567ccafae602b97ec5024"
+
 [[package]]
 name = "is_terminal_polyfill"
 version = "1.70.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7943c866cc5cd64cbc25b2e01621d07fa8eb2a1a23160ee81ce38704e97b8ecf"
 
+[[package]]
+name = "libc"
+version = "0.2.159"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "561d97a539a36e26a9a5fad1ea11a3039a67714694aaa379433e580854bc3dc5"
+
+[[package]]
+name = "lock_api"
+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07af8b9cdd281b7915f413fa73f29ebd5d55d0d3f0155584dade1ff18cea1b17"
+dependencies = [
+ "autocfg",
+ "scopeguard",
+]
+
+[[package]]
+name = "memchr"
+version = "2.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
+
+[[package]]
+name = "miniz_oxide"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2d80299ef12ff69b16a84bb182e3b9df68b5a91574d3d4fa6e41b65deec4df1"
+dependencies = [
+ "adler2",
+]
+
+[[package]]
+name = "mio"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "80e04d1dcff3aae0704555fe5fee3bcfaf3d1fdf8a7e521d5b9d2b42acb52cec"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "wasi",
+ "windows-sys",
+]
+
+[[package]]
+name = "object"
+version = "0.36.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aedf0a2d09c573ed1d8d85b30c119153926a2b36dce0ab28322c09a117a4683e"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "parking_lot"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1bf18183cf54e8d6059647fc3063646a1801cf30896933ec2311622cc4b9a27"
+dependencies = [
+ "lock_api",
+ "parking_lot_core",
+]
+
+[[package]]
+name = "parking_lot_core"
+version = "0.9.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e401f977ab385c9e4e3ab30627d6f26d00e2c73eef317493c4ec6d468726cf8"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "redox_syscall",
+ "smallvec",
+ "windows-targets",
+]
+
+[[package]]
+name = "pin-project-lite"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bda66fc9667c18cb2758a2ac84d1167245054bcf85d5d1aaa6923f45801bdd02"
+
 [[package]]
 name = "proc-macro2"
 version = "1.0.86"
@@ -142,6 +289,52 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "redox_syscall"
+version = "0.5.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b6dfecf2c74bce2466cabf93f6664d6998a69eb21e39f4207930065b27b771f"
+dependencies = [
+ "bitflags",
+]
+
+[[package]]
+name = "rustc-demangle"
+version = "0.1.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "719b953e2095829ee67db738b3bfa9fa368c94900df327b3f07fe6e794d2fe1f"
+
+[[package]]
+name = "scopeguard"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
+
+[[package]]
+name = "signal-hook-registry"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a9e9e0b4211b72e7b8b6e85c807d36c212bdb33ea8587f7569562a84df5465b1"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "smallvec"
+version = "1.13.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c5e1a9a646d36c3599cd173a41282daf47c44583ad367b8e6837255952e5c67"
+
+[[package]]
+name = "socket2"
+version = "0.5.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce305eb0b4296696835b71df73eb912e0f1ffd2556a501fcede6e0c50349191c"
+dependencies = [
+ "libc",
+ "windows-sys",
+]
+
 [[package]]
 name = "strsim"
 version = "0.11.1"
@@ -166,6 +359,36 @@ dependencies = [
  "byteorder",
  "clap",
  "clap_complete",
+ "tokio",
+]
+
+[[package]]
+name = "tokio"
+version = "1.40.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2b070231665d27ad9ec9b8df639893f46727666c6767db40317fbe920a5d998"
+dependencies = [
+ "backtrace",
+ "bytes",
+ "libc",
+ "mio",
+ "parking_lot",
+ "pin-project-lite",
+ "signal-hook-registry",
+ "socket2",
+ "tokio-macros",
+ "windows-sys",
+]
+
+[[package]]
+name = "tokio-macros"
+version = "2.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "693d596312e88961bc67d7f1f97af8a70227d9f90c31bba5806eec004978d752"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
 ]
 
 [[package]]
@@ -180,6 +403,12 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"
 
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
 [[package]]
 name = "windows-sys"
 version = "0.52.0"

Cargo.toml

@@ -19,18 +19,18 @@ path = "src/lib.rs"
 [[bin]]
 name = "tenjin"
 path = "src/main.rs"
-required-features = ["cli"]
 
 [dependencies]
 byteorder = "1.0.0"
 clap = { version = "4.5.13", features = ["derive"], optional = true }
 clap_complete = { version = "4.5.23", optional = true }
+tokio = { version = "1.40.0", features = ["full"] }
 
 [profile.release]
 strip = true
 
 [features]
-default = []
+default = ["full"]
 example = []
 cli = ["dep:clap", "dep:clap_complete", "example"]
 full = ["cli"]

src/example/ctrl13.rs

 #![allow(unused)]
 #![allow(unused_variables)]
-use std::{collections::HashMap, net::TcpStream};
-
 use crate::{
     etherparser::{ether_type::EtherType, MacAddr},
     openflow::ofp13::{
@@ -10,6 +8,8 @@ use crate::{
         ControllerFrame13, FlowModEvent, OfpMsgEvent, PacketInEvent,
     },
 };
+use std::collections::HashMap;
+use tokio::net::TcpStream;
 /**
  * Here is Controller you can modify and write the process or more you need.
  * In production please remove allow unused.
@@ -29,7 +29,7 @@ impl ControllerFrame13 for Controller13 {
     /**
      * Start here for handle packetIn message.
      */
-    fn switch_features_handler(
+    async fn switch_features_handler(
         &self,
         xid: u32,
         features_reply: ofp13::FeaturesReplyEvent,
@@ -38,8 +38,14 @@ impl ControllerFrame13 for Controller13 {
         let matchs = MatchFields::match_all();
         let actions = vec![Action::Oputput(ofp13::PseudoPort::Controller(!0))];
         self.add_flow(xid, 0, matchs, &actions, 0, None, stream)
+            .await;
     }
-    fn packet_in_handler(&mut self, xid: u32, packetin: PacketInEvent, stream: &mut TcpStream) {
+    async fn packet_in_handler(
+        &mut self,
+        xid: u32,
+        packetin: PacketInEvent,
+        stream: &mut TcpStream,
+    ) {
         let pkt = match packetin.ether_parse() {
             Ok(pkt) => pkt,
             Err(_) => return,
@@ -74,8 +80,8 @@ impl ControllerFrame13 for Controller13 {
         if let ofp13::PseudoPort::PhysicalPort(_) = out_port {
             let mut match_fields = MatchFields::match_all();
             match_fields.in_port = Some(in_port);
-            match_fields.eth_dst = Some(MacAddr::from(mac_dst));
-            match_fields.eth_src = Some(MacAddr::from(mac_src));
+            match_fields.eth_dst = Some(mac_dst);
+            match_fields.eth_src = Some(mac_src);
             if let Some(buf_id) = packetin.buf_id {
                 self.add_flow(
                     xid,
@@ -85,7 +91,8 @@ impl ControllerFrame13 for Controller13 {
                     packetin.table_id,
                     Some(buf_id),
                     stream,
-                );
+                )
+                .await;
                 return;
             } else {
                 self.add_flow(
@@ -96,18 +103,19 @@ impl ControllerFrame13 for Controller13 {
                     packetin.table_id,
                     None,
                     stream,
-                );
+                )
+                .await;
             }
         }
         let packet_out = self
             .ofp()
             .packet_out(Some(in_port), packetin.payload, actions);
-        self.send_msg(packet_out, xid, stream);
+        self.send_msg(packet_out, xid, stream).await;
     }
 }
 
 impl Controller13 {
-    fn add_flow(
+    async fn add_flow(
         &self,
         xid: u32,
         priority: u16,
@@ -122,5 +130,6 @@ impl Controller13 {
             xid,
             stream,
         )
+        .await
     }
 }

src/main.rs

-use tenjin::cli;
+use tenjin::{example::Controller13, openflow::ofp13::ControllerFrame13};
 
 /**
  * If you prefer to run only Controller without cli.
@@ -10,6 +10,8 @@ fn main() {
 }
  ```
  */
-fn main() {
-    cli::system();
+#[tokio::main]
+async fn main() {
+    let controller = Controller13::new();
+    controller.listener("127.0.0.1:6653").await;
 }

src/openflow/ofp13/controller_frame.rs

-use crate::openflow::ofp13::{ErrorEvent, Msg, PacketInEvent};
-use std::{
-    io::{Read, Write},
-    net::TcpStream,
-};
+use std::future::Future;
 
 use super::{
     events::{echo_reply::EchoReplyEvent, EchoRequestEvent},
     tcp_listener_handler, FeaturesReplyEvent, MessageMarshal, OfpMsgEvent, Openflow13,
     OpenflowHeader,
 };
+use crate::openflow::ofp13::{ErrorEvent, Msg, PacketInEvent};
+use tokio::{
+    io::{AsyncReadExt, AsyncWriteExt},
+    net::TcpStream,
+};
 
-pub trait ControllerFrame13
-where
-    Self: 'static,
-{
+pub trait ControllerFrame13: Send {
     fn ofp(&self) -> Openflow13 {
         Openflow13::new()
     }
-    fn packet_in_handler(&mut self, xid: u32, packetin: PacketInEvent, stream: &mut TcpStream);
+    fn packet_in_handler(
+        &mut self,
+        xid: u32,
+        packetin: PacketInEvent,
+        stream: &mut TcpStream,
+    ) -> impl Future<Output = ()> + Send;
     fn new() -> Self;
 
-    fn listener(&self, address: &str)
+    fn listener(&self, address: &str) -> impl Future<Output = ()> + Send
     where
-        Self: Sized,
-        Self: Send,
+        Self: Sized + 'static,
         Self: Clone,
+        Self: Sync,
     {
-        println!("server run at {}", address);
-        let _ = tcp_listener_handler(address, self.clone());
+        async move {
+            println!("server run at {}", address);
+            let _ = tcp_listener_handler(address, self).await;
+        }
     }
 
     fn handle_header(&mut self, buf: &mut Vec<u8>) -> Option<(u8, usize, u32)> {
-        let ofp_header = self.ofp().header_parse(&buf);
+        let ofp_header = self.ofp().header_parse(buf);
         match ofp_header {
             Ok(header) => Some((header.message(), header.pkt_size(), header.xid())),
             Err(_) => None,
         }
     }
 
-    fn request_handler(&mut self, buf: &mut Vec<u8>, stream: &mut TcpStream) {
-        let ofp = self.ofp();
-        let (message, pkt_size, xid) = match self.handle_header(buf) {
-            Some(header) => header,
-            None => return,
-        };
-        let mut payload = vec![0u8; pkt_size];
-        let _ = stream.read(&mut payload);
-        let message = ofp.msg_parse(message as u8);
-        match message {
-            Msg::Hello => self.hello_handler(xid, stream),
-            Msg::Error => match ErrorEvent::parse(&payload) {
-                Ok(error) => self.error_handler(error),
-                Err(_) => (),
-            },
-            Msg::EchoRequest => {
-                self.echo_request_handler(xid, EchoRequestEvent::new(payload), stream)
+    fn request_handler(
+        &mut self,
+        buf: &mut Vec<u8>,
+        stream: &mut TcpStream,
+    ) -> impl Future<Output = ()> + Send
+    where
+        Self: Sync,
+    {
+        async move {
+            let ofp = self.ofp();
+            let (message, pkt_size, xid) = match self.handle_header(buf) {
+                Some(header) => header,
+                None => return,
+            };
+            let mut payload = vec![0u8; pkt_size];
+            let _ = stream.read(&mut payload).await;
+            let message = ofp.msg_parse(message);
+            match message {
+                Msg::Hello => self.hello_handler(xid, stream).await,
+                Msg::Error => {
+                    if let Ok(error) = ErrorEvent::parse(&payload) {
+                        self.error_handler(error)
+                    }
+                }
+                Msg::EchoRequest => {
+                    self.echo_request_handler(xid, EchoRequestEvent::new(payload), stream)
+                        .await
+                }
+                Msg::FeaturesReply => {
+                    if let Ok(features) = FeaturesReplyEvent::parse(&payload) {
+                        self.switch_features_handler(xid, features, stream).await
+                    }
+                }
+                Msg::PacketIn => {
+                    if let Ok(pkt_in) = PacketInEvent::parse(&payload) {
+                        self.packet_in_handler(xid, pkt_in, stream).await
+                    }
+                }
+                _ => (),
             }
-            Msg::FeaturesReply => match FeaturesReplyEvent::parse(&payload) {
-                Ok(features) => self.switch_features_handler(xid, features, stream),
-                Err(_) => (),
-            },
-            Msg::PacketIn => match PacketInEvent::parse(&payload) {
-                Ok(pkt_in) => self.packet_in_handler(xid, pkt_in, stream),
-                Err(_) => (),
-            },
-            _ => (),
         }
     }
 
-    fn send_msg<MSM: MessageMarshal>(&self, msg: MSM, xid: u32, stream: &mut TcpStream) {
-        let ofp = self.ofp();
-        let mut header_bytes: Vec<u8> = Vec::new();
-        let mut body_bytes: Vec<u8> = Vec::new();
+    fn send_msg<MSM: MessageMarshal + std::marker::Send>(
+        &self,
+        msg: MSM,
+        xid: u32,
+        stream: &mut TcpStream,
+    ) -> impl Future<Output = ()> + Send
+    where
+        Self: Sync,
+    {
+        async move {
+            let ofp = self.ofp();
+            let mut header_bytes: Vec<u8> = Vec::new();
+            let mut body_bytes: Vec<u8> = Vec::new();
 
-        msg.marshal(&mut body_bytes);
-        let ofp_header = ofp.header(msg.msg_usize() as u8, body_bytes.len() as u16, xid);
-        ofp_header.marshal(&mut header_bytes);
-        header_bytes.append(&mut body_bytes);
-        let _ = stream.write_all(&header_bytes);
+            msg.marshal(&mut body_bytes);
+            let ofp_header = ofp.header(msg.msg_usize() as u8, body_bytes.len() as u16, xid);
+            ofp_header.marshal(&mut header_bytes);
+            header_bytes.append(&mut body_bytes);
+            let _ = stream.write_all(&header_bytes).await;
+        }
     }
 
     /**
      * for handle message
      */
-    fn hello_handler(&self, xid: u32, stream: &mut TcpStream) {
-        self.send_msg(self.ofp().fetures_req(), xid, stream);
+    fn hello_handler(&self, xid: u32, stream: &mut TcpStream) -> impl Future<Output = ()> + Send
+    where
+        Self: Sync,
+    {
+        async move {
+            self.send_msg(self.ofp().fetures_req(), xid, stream).await;
+        }
     }
     fn error_handler(&self, error: ErrorEvent) {
         println!("Error {:?} payload: {:x?}", error.error_type, error.payload);
     }
-    fn echo_request_handler(&self, xid: u32, echo: EchoRequestEvent, stream: &mut TcpStream) {
-        self.send_msg(EchoReplyEvent::new(echo.payload), xid, stream);
+    fn echo_request_handler(
+        &self,
+        xid: u32,
+        echo: EchoRequestEvent,
+        stream: &mut TcpStream,
+    ) -> impl Future<Output = ()> + Send
+    where
+        Self: Sync,
+    {
+        async move {
+            self.send_msg(EchoReplyEvent::new(echo.payload), xid, stream)
+                .await;
+        }
     }
     #[allow(unused)]
     fn switch_features_handler(
@@ -98,6 +142,7 @@ where
         xid: u32,
         features_reply: FeaturesReplyEvent,
         stream: &mut TcpStream,
-    ) {
+    ) -> impl std::future::Future<Output = ()> + Send {
+        async {}
     }
 }

src/openflow/ofp13/events/payload.rs

@@ -14,7 +14,7 @@ impl Payload {
     pub fn marshal(&self, bytes: &mut Vec<u8>) {
         match self {
             Payload::Buffered(_, buf) | Payload::NoBuffered(buf) => {
-                let _ = bytes.write_all(&buf);
+                let _ = bytes.write_all(buf);
             }
         }
     }

src/openflow/ofp13/ofp_header.rs

@@ -40,7 +40,7 @@ impl OpenflowHeader for OfpHeader {
         size_of::<Self>()
     }
     fn pkt_size(&self) -> usize {
-        return self.length as usize - size_of::<Self>();
+        self.length as usize - size_of::<Self>()
     }
 
     fn parse(buf: &Vec<u8>) -> Result<Self, Error> {

src/openflow/ofp13/ofp_manager.rs

@@ -12,6 +12,12 @@ impl Openflow13 {
     }
 }
 
+impl Default for Openflow13 {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl OfpMsgEvent for Openflow13 {
     fn header_parse(&self, bytes: &Vec<u8>) -> Result<OfpHeader, std::io::Error> {
         OfpHeader::parse(bytes)

src/openflow/ofp13/tcp_listener.rs

-use std::{io::Read, net::TcpListener, thread};
-
-use crate::openflow::ofp13::HelloEvent;
-
 use super::{ControllerFrame13, OfpMsgEvent};
+use crate::openflow::ofp13::HelloEvent;
+use tokio::{
+    io::AsyncReadExt,
+    net::{TcpListener, TcpStream},
+};
 
-pub fn tcp_listener_handler(
+pub async fn tcp_listener_handler(
     address: &str,
-    controller: impl ControllerFrame13 + Send + 'static + Clone,
+    controller: &(impl ControllerFrame13 + 'static + Clone + Sync),
 ) -> Result<(), std::io::Error> {
-    let listener = TcpListener::bind(address)?;
-    for stream in listener.incoming() {
-        match stream {
-            Ok(mut stream) => {
-                if let Ok(addr) = stream.peer_addr() {
-                    println!("server has connection from {}", addr);
-                }
+    let listener = TcpListener::bind(address).await?;
+    loop {
+        let (mut stream, _) = listener.accept().await?;
+        if let Ok(addr) = stream.peer_addr() {
+            println!("server has connection from {}", addr);
+        }
 
-                let mut ctrl = controller.clone();
-                thread::spawn(move || {
-                    ctrl.send_msg(HelloEvent::new(), 0, &mut stream);
-                    let ofp_size = ctrl.ofp().header_size();
-                    let mut buffer = vec![0u8; ofp_size];
-                    loop {
-                        match stream.read(&mut buffer) {
-                            Ok(v) if v > 0 => {
-                                ctrl.request_handler(&mut buffer, &mut stream);
-                            }
-                            Ok(_) => {
-                                break;
-                            }
-                            Err(_) => {
-                                println!("cannot read packet");
-                                break;
-                            }
-                        }
-                    }
-                });
+        let mut ctrl = controller.clone();
+        tokio::spawn(async move {
+            processing(&mut ctrl, &mut stream).await;
+        });
+    }
+}
+
+async fn processing(ctrl: &mut (impl ControllerFrame13 + Clone + Sync), stream: &mut TcpStream) {
+    ctrl.send_msg(HelloEvent::new(), 0, stream).await;
+    let ofp_size = ctrl.ofp().header_size();
+    let mut buffer = vec![0u8; ofp_size];
+    loop {
+        match stream.read(&mut buffer).await {
+            Ok(v) if v > 0 => {
+                ctrl.request_handler(&mut buffer, stream).await;
+            }
+            Ok(_) => {
+                break;
+            }
+            Err(_) => {
+                println!("cannot read packet");
+                break;
             }
-            Err(_) => panic!("Connection failed!"),
         }
     }
-    Ok(())
 }