Mercurial > crates > systemd-socket

annotate README.md @ 0:a65053246c29

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Initial commit
author Martin Habovstiak <martin.habovstiak@gmail.com>
date Thu, 26 Nov 2020 22:53:35 +0100
parents
children 0edcde404b02
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
1 # systemd socket
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
2
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
3 A convenience crate for optionally supporting systemd socket activation.
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
4
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
5 ## About
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
6
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
7 The goal of this crate is to make socket activation with systemd in your project trivial.
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
8 It provides a replacement for `std::net::SocketAddr` that allows parsing the bind address from string just like the one from `std`
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
9 but on top of that also allows `systemd://socket_name` format that tells it to use systemd activation with given socket name.
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
10 Then it provides a method to bind the address which will return the socket from systemd if available.
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
11
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
12 The provided type supports conversions from various types of strings and also `serde` and `parse_arg` via feature flag.
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
13 Thanks to this the change to your code should be minimal - parsing will continue to work, it'll just allow a new format.
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
14 You only need to change the code to use `SocketAddr::bind()` instead of `TcpListener::bind()` for binding.
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
15
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
16 Further, the crate also provides convenience methods for binding `tokio` 0.2, 0.3, and `async_std` sockets.
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
17
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
18 ## Example
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
19
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
20 ```rust
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
21 use systemd_socket::SocketAddr;
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
22 use std::convert::TryFrom;
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
23 use std::io::Write;
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
24
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
25 let mut args = std::env::args_os();
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
26 let program_name = args.next().expect("unknown program name");
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
27 let socket_addr = args.next().expect("missing socket address");
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
28 let socket_addr = SocketAddr::try_from(socket_addr).expect("failed to parse socket address");
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
29 let socket = socket_addr.bind().expect("failed to bind socket");
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
30
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
31 loop {
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
32 let _ = socket
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
33 .accept()
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
34 .expect("failed to accept connection")
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
35 .0
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
36 .write_all(b"Hello world!")
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
37 .map_err(|err| eprintln!("Failed to send {}", err));
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
38 }
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
39 ```
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
40
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
41 ## Features
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
42
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
43 * `serde` - implements `serde::Deserialize` for `SocketAddr`
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
44 * `parse_arg` - implements `parse_arg::ParseArg` for `SocketAddr`
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
45 * `tokio_0_2` - adds `bind_tokio_0_2` convenience method to `SocketAddr`
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
46 * `tokio_0_3` - adds `bind_tokio_0_3` convenience method to `SocketAddr`
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
47 * `async_std` - adds `bind_async_std` convenience method to `SocketAddr`
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
48
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
49 ## License
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
50
a65053246c29 Initial commit
Martin Habovstiak <martin.habovstiak@gmail.com>
parents:
diff changeset
51 MITNFA