mirror of
https://github.com/actix/actix-website
synced 2024-11-24 16:52:59 +01:00
77 lines
2.0 KiB
Markdown
77 lines
2.0 KiB
Markdown
---
|
|
title: Autoreloading
|
|
menu: docs_patterns
|
|
weight: 1000
|
|
---
|
|
|
|
# Auto-Reloading Development Server
|
|
|
|
During development it can be very handy to have cargo automatically recompile
|
|
the code on change. This can be accomplished by using
|
|
[cargo-watch](https://github.com/passcod/cargo-watch). Because an actix app
|
|
will typically bind to a port for listening for incoming HTTP requests it makes
|
|
sense to combine this with the [listenfd](https://crates.io/crates/listenfd)
|
|
crate and the [systemfd](https://github.com/mitsuhiko/systemfd) utility to
|
|
ensure the socket is kept open while the app is compiling and reloading.
|
|
|
|
`systemfd` will open a socket and pass it to `cargo-watch` which will watch for
|
|
changes and then invoke the compiler and run your actix app. The actix app
|
|
will then use `listenfd` to pick up the socket that `systemfd` opened.
|
|
|
|
## Binaries Necessary
|
|
|
|
For an automatic reloading experience you need to install `cargo-watch` and
|
|
`systemfd`. Both are written in rust and can be installed with `cargo install`:
|
|
|
|
```
|
|
cargo install systemfd cargo-watch
|
|
```
|
|
|
|
## Code Changes
|
|
|
|
Additionally you need to slightly modify your actix app so that it can pick up
|
|
an external socket opened by `systemfd`. Add the listenfd dependency to your
|
|
app:
|
|
|
|
```ini
|
|
[dependencies]
|
|
listenfd = "0.3"
|
|
```
|
|
|
|
Then modify your server code to only invoke `bind` as a fallback:
|
|
|
|
```rust
|
|
extern crate listenfd;
|
|
|
|
use listenfd::ListenFd;
|
|
use actix_web::{server, App, HttpRequest, Responder};
|
|
|
|
fn index(_req: &HttpRequest) -> impl Responder {
|
|
"Hello World!"
|
|
}
|
|
|
|
fn main() {
|
|
let mut listenfd = ListenFd::from_env();
|
|
let mut server = server::new(|| {
|
|
App::new()
|
|
.resource("/", |r| r.f(index))
|
|
});
|
|
|
|
server = if let Some(l) = listenfd.take_tcp_listener(0).unwrap() {
|
|
server.listen(l)
|
|
} else {
|
|
server.bind("127.0.0.1:3000").unwrap()
|
|
};
|
|
|
|
server.run();
|
|
}
|
|
```
|
|
|
|
## Running the Server
|
|
|
|
To now run the development server invoke this command:
|
|
|
|
```
|
|
systemfd --no-pid -s http::3000 -- cargo watch -x run
|
|
```
|