concurrency

Cargo.toml

@@ -1,3 +1,4 @@
+workspace = { members = ["spammer"] }
 [package]
 name = "netpong"
 version = "0.1.1"

scripts/client.py

@@ -1,21 +1,26 @@
 import socket
 
-HOST = "127.0.0.1"
-PORT = 9999
 
-payload = b"ping\0"
+def ping():
 
-with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+    HOST = "127.0.0.1"
-    s.connect((HOST, PORT))
+    PORT = 9999
-    while True:
-        try:
-            s.sendall(payload)
-            print("> ping")
-        except Exception as e:
-            break
-        reply = s.recv(1024).decode()
-        if reply == "":
-            break
-        print(f"< {reply}")
-    print("connection shut down")
 
+    payload = b"ping\0"
+
+    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
+        s.connect((HOST, PORT))
+        while True:
+            try:
+                s.sendall(payload)
+                print("> ping")
+            except Exception as e:
+                break
+            reply = s.recv(1024).decode()
+            if reply == "":
+                break
+            print(f"< {reply}")
+        print("connection shut down")
+
+if __name__ == "__main__":
+    ping()

scripts/spam.rs

@@ -0,0 +1,12 @@
+const MAX: usize = 50;
+use std::process::Command;
+
+fn main() {
+    let mut pool = ThreadPool::new(MAX);
+
+    loop {
+        pool.execute(||{
+            Command::new("python3").args(["scripts/client.py"]).output().unwrap();
+        });
+    }
+}

spammer/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "spammer"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+threadpool = "1.8.1"

spammer/src/main.rs

@@ -0,0 +1,22 @@
+use threadpool::ThreadPool;
+const MAX: usize = 500;
+use std::process::{exit, Command};
+
+fn main() {
+    let pool = ThreadPool::new(MAX);
+
+    loop {
+        if pool.queued_count() < MAX {
+            pool.execute(|| {
+                let mut cmd = Command::new("/usr/bin/python3");
+                cmd.args(["../scripts/client.py"]);
+                let o = cmd.output().unwrap();
+                let s = cmd.status().unwrap();
+            });
+        }
+        else {
+            std::thread::sleep(std::time::Duration::from_millis(400));
+            println!("pool: {pool:?}")
+        }
+    }
+}

src/main.rs

@@ -25,13 +25,10 @@ async fn main() -> Result<()> {
     #[cfg(feature = "server")]
     if cli.server {
         info!("starting server");
-        return Server::build(cfg).await?.start().await;
+        return Server::build(cfg).await?.run().await;
-        loop {
-            // now we wait
-        }
     }
     // implicit else, so we can work without the server feature
     info!("starting client");
     todo!();
-    Ok(())
+    loop {}
 }

src/server/mod.rs

@@ -1,5 +1,5 @@
 #![cfg(feature = "server")]
-use std::time::Duration;
+use std::{time::Duration, sync::Arc};
 
 use libpt::log::{debug, info, trace, warn};
 use tokio::{
@@ -18,46 +18,32 @@ pub struct Server {
     cfg: Config,
     pub timeout: Option<Duration>,
     server: TcpListener,
-    accept_runtime: Runtime,
-    request_runtime: Runtime,
 }
 
 impl Server {
     pub async fn build(cfg: Config) -> anyhow::Result<Self> {
         let server = TcpListener::bind(cfg.addr).await?;
         let timeout = Some(Duration::from_secs(5));
-        let accept_runtime = Builder::new_multi_thread()
-            .worker_threads(1)
-            .thread_stack_size(3 * 1024 * 1024)
-            .enable_io()
-            .enable_time()
-            .build()?;
-        let request_runtime = Builder::new_multi_thread()
-            .worker_threads(1)
-            .thread_stack_size(3 * 1024 * 1024)
-            .enable_io()
-            .enable_time()
-            .build()?;
         Ok(Server {
             cfg,
             timeout,
             server,
-            accept_runtime,
-            request_runtime,
         })
     }
-    pub async fn start(self) -> anyhow::Result<()> {
+    pub async fn run(self) -> anyhow::Result<()> {
-        self.accept_runtime.block_on(async {
+            let rc_self = Arc::new(self);
             loop {
-                let (stream, addr) = match self.server.accept().await {
+                let rc_self = rc_self.clone();
+                let (stream, addr) = match rc_self.server.accept().await {
                     Ok(s) => s,
                     Err(err) => {
                         warn!("could not accept stream: {err:?}");
                         continue;
                     }
                 };
-                let _guard = self.request_runtime.enter();
+                tokio::spawn(async move {
-                match self.handle_stream(stream).await {
+
+                match rc_self.handle_stream(stream).await {
                     Ok(_) => (),
                     Err(err) => {
                         match err {
@@ -68,12 +54,10 @@ impl Server {
                                 warn!("error while handling stream: {:?}", err)
                             }
                         }
-                        continue;
                     }
                 };
+                });
             }
-        });
-        Ok(())
     }
 
     async fn handle_stream(&self, stream: TcpStream) -> Result<()> {