increase mpsc cap

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "markov"
-version = "0.1.1"
+version = "0.1.2"
 description = "Generate string of text from Markov chain fed by stdin"
 authors = ["Avril <flanchan@cumallover.me>"]
 edition = "2018"

src/main.rs

@@ -93,17 +93,18 @@ impl fmt::Display for GenBodyError
 
 async fn gen_body(chain: Arc<RwLock<Chain<String>>>, num: Option<usize>, mut output: mpsc::Sender<String>) -> Result<(), GenBodyError>
 {
-    let chain = chain.read().await;
-    if !chain.is_empty() {	
-	match num {
-	    Some(num) if num < MAX_GEN_SIZE => {
-		for string in chain.str_iter_for(num) {
-		    output.send(string).await.map_err(|e| GenBodyError(e.0))?;
-		}
-	    },
-	    _ => output.send(chain.generate_str()).await.map_err(|e| GenBodyError(e.0))?,
+	let chain = chain.read().await;
+	if !chain.is_empty() {	
+	    match num {
+		Some(num) if num < MAX_GEN_SIZE => {
+		    //This could DoS `full_body` and writes, potentially.
+		    for string in chain.str_iter_for(num) {
+			output.send(string).await.map_err(|e| GenBodyError(e.0))?;
+		    }
+		},
+		_ => output.send(chain.generate_str()).await.map_err(|e| GenBodyError(e.0))?,
+	    }
 	}
-    }
     Ok(())
 }
 
@@ -149,7 +150,7 @@ async fn main() {
         .and(warp::path::param().map(|opt: usize| Some(opt)).or(warp::any().map(|| Option::<usize>::None)).unify())
         .and_then(|chain: Arc<RwLock<Chain<String>>>, host: IpAddr, num: Option<usize>| {
 	    async move {
-		let (tx, rx) = mpsc::channel(16);
+		let (tx, rx) = mpsc::channel(MAX_GEN_SIZE);
 		tokio::spawn(gen_body(chain, num, tx));
 		Ok::<_, std::convert::Infallible>(Response::new(Body::wrap_stream(rx.map(move |x| {
 		    info!("{} <- {:?}", host, x);