Module salvo_extra::concurrency_limiter
source · Available on crate feature
concurrency-limiter
only.Expand description
Middleware for limit concurrency.
Limit the max number of requests being concurrently processed.
Example:
use std::fs::create_dir_all;
use std::path::Path;
use salvo_core::prelude::*;
use salvo_extra::concurrency_limiter::*;
#[handler]
async fn index(res: &mut Response) {
res.render(Text::Html(INDEX_HTML));
}
#[handler]
async fn upload(req: &mut Request, res: &mut Response) {
let file = req.file("file").await;
tokio::time::sleep(tokio::time::Duration::from_secs(10)).await;
if let Some(file) = file {
let dest = format!("temp/{}", file.name().unwrap_or("file"));
tracing::debug!(dest = %dest, "upload file");
if let Err(e) = std::fs::copy(file.path(), Path::new(&dest)) {
res.status_code(StatusCode::INTERNAL_SERVER_ERROR);
res.render(Text::Plain(format!("file not found in request: {e}")));
} else {
res.render(Text::Plain(format!("File uploaded to {dest}")));
}
} else {
res.status_code(StatusCode::BAD_REQUEST);
res.render(Text::Plain("file not found in request"));
}
}
#[tokio::main]
async fn main() {
create_dir_all("temp").unwrap();
let router = Router::new()
.get(index)
.push(Router::new().hoop(max_concurrency(1)).path("limited").post(upload))
.push(Router::with_path("unlimit").post(upload));
let acceptor = TcpListener::new("0.0.0.0:5800").bind().await;
Server::new(acceptor).serve(router).await;
}
static INDEX_HTML: &str = r#"<!DOCTYPE html>
<html>
<head>
<title>Upload file</title>
</head>
<body>
<h1>Upload file</h1>
<form action="/unlimit" method="post" enctype="multipart/form-data">
<h3>Unlimit</h3>
<input type="file" name="file" />
<input type="submit" value="upload" />
</form>
<form action="/limited" method="post" enctype="multipart/form-data">
<h3>Limited</h3>
<input type="file" name="file" />
<input type="submit" value="upload" />
</form>
</body>
</html>
"#;
Structs§
- MaxConcurrency
Functions§
- Create a new
MaxConcurrency
.