Mercurial > crates > systemd-socket

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author Martin Habovstiak <martin.habovstiak@gmail.com>
date Thu, 26 Nov 2020 22:53:35 +0100
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1 # systemd socket
2
3 A convenience crate for optionally supporting systemd socket activation.
4
5 ## About
6
7 The goal of this crate is to make socket activation with systemd in your project trivial.
8 It provides a replacement for `std::net::SocketAddr` that allows parsing the bind address from string just like the one from `std`
9 but on top of that also allows `systemd://socket_name` format that tells it to use systemd activation with given socket name.
10 Then it provides a method to bind the address which will return the socket from systemd if available.
11
12 The provided type supports conversions from various types of strings and also `serde` and `parse_arg` via feature flag.
13 Thanks to this the change to your code should be minimal - parsing will continue to work, it'll just allow a new format.
14 You only need to change the code to use `SocketAddr::bind()` instead of `TcpListener::bind()` for binding.
15
16 Further, the crate also provides convenience methods for binding `tokio` 0.2, 0.3, and `async_std` sockets.
17
18 ## Example
19
20 ```rust
21 use systemd_socket::SocketAddr;
22 use std::convert::TryFrom;
23 use std::io::Write;
24
25 let mut args = std::env::args_os();
26 let program_name = args.next().expect("unknown program name");
27 let socket_addr = args.next().expect("missing socket address");
28 let socket_addr = SocketAddr::try_from(socket_addr).expect("failed to parse socket address");
29 let socket = socket_addr.bind().expect("failed to bind socket");
30
31 loop {
32 let _ = socket
33 .accept()
34 .expect("failed to accept connection")
35 .0
36 .write_all(b"Hello world!")
37 .map_err(|err| eprintln!("Failed to send {}", err));
38 }
39 ```
40
41 ## Features
42
43 * `serde` - implements `serde::Deserialize` for `SocketAddr`
44 * `parse_arg` - implements `parse_arg::ParseArg` for `SocketAddr`
45 * `tokio_0_2` - adds `bind_tokio_0_2` convenience method to `SocketAddr`
46 * `tokio_0_3` - adds `bind_tokio_0_3` convenience method to `SocketAddr`
47 * `async_std` - adds `bind_async_std` convenience method to `SocketAddr`
48
49 ## License
50
51 MITNFA