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|
// -*- coding: utf-8 -*-
//
// Simple CMS
//
// Copyright (C) 2011-2024 Michael Büsch <m@bues.ch>
//
// Licensed under the Apache License version 2.0
// or the MIT license, at your option.
// SPDX-License-Identifier: Apache-2.0 OR MIT
use crate::msg::{DeserializeResult, MsgSerde, MAX_RX_BUF};
use anyhow::{self as ah, format_err as err, Context as _};
use cms_systemd::{systemd_notify_ready, unix_from_systemd};
use libc::{S_IFMT, S_IFSOCK};
use std::{
fs::{metadata, remove_file},
io::ErrorKind,
os::unix::{fs::MetadataExt as _, net::UnixListener as StdUnixListener},
path::Path,
};
use tokio::net::{UnixListener, UnixStream};
pub struct CmsSocket {
sock: UnixListener,
}
impl CmsSocket {
/// Create a new [CmsSocket] with the specified path.
fn new(sock_path: &Path) -> ah::Result<Self> {
if let Ok(meta) = metadata(sock_path) {
if meta.mode() & S_IFMT == S_IFSOCK {
remove_file(sock_path).context("Remove existing socket")?;
}
}
let sock = UnixListener::bind(sock_path).context("Bind socket")?;
Ok(Self::from_listener(sock))
}
/// Create a new [CmsSocket] instance from the given [tokio] socket.
fn from_listener(sock: UnixListener) -> Self {
Self { sock }
}
/// Create a new [CmsSocket] instance from the given [std] socket.
fn from_std_listener(sock: StdUnixListener) -> ah::Result<Self> {
sock.set_nonblocking(true)
.context("Set socket non-blocking")?;
Ok(Self::from_listener(UnixListener::from_std(sock)?))
}
/// Create a new [CmsSocket] from Systemd environment
/// or from the specified path, if there is no Systemd.
pub fn from_systemd_or_path(no_systemd: bool, sock_path: &Path) -> ah::Result<Self> {
if !no_systemd {
if let Some(unix_listener) = unix_from_systemd()? {
println!("Using socket from systemd.");
let sock = Self::from_std_listener(unix_listener)?;
systemd_notify_ready()?;
return Ok(sock);
}
}
println!("Creating socket {sock_path:?}.");
Self::new(sock_path)
}
pub async fn accept(&mut self) -> ah::Result<CmsSocketConn> {
let (stream, _addr) = self.sock.accept().await?;
Ok(CmsSocketConn::new(stream))
}
}
pub struct CmsSocketConn {
stream: UnixStream,
}
impl CmsSocketConn {
fn new(stream: UnixStream) -> Self {
Self { stream }
}
pub async fn connect(path: &Path) -> ah::Result<Self> {
Ok(Self::new(UnixStream::connect(path).await?))
}
pub async fn recv_msg<F, M>(&mut self, try_deserialize: F) -> ah::Result<Option<M>>
where
F: Fn(&[u8]) -> ah::Result<DeserializeResult<M>>,
{
const SIZE_STEP: usize = 4096;
let mut rxbuf = vec![0; SIZE_STEP];
let mut rxcount = 0;
loop {
self.stream
.readable()
.await
.context("Socket polling (rx)")?;
match self.stream.try_read(&mut rxbuf[rxcount..]) {
Ok(n) => {
if n == 0 {
return Ok(None);
}
rxcount += n;
if let DeserializeResult::Ok(msg) = try_deserialize(&rxbuf[..rxcount])? {
return Ok(Some(msg));
}
if rxcount >= rxbuf.len() {
if rxbuf.len() >= MAX_RX_BUF {
return Err(err!("RX buffer overrun."));
}
rxbuf.resize(rxbuf.len() + SIZE_STEP, 0);
}
}
Err(ref e) if e.kind() == ErrorKind::WouldBlock => (),
Err(e) => {
return Err(err!("Socket read: {e}"));
}
}
}
}
pub async fn send_msg<M>(&mut self, msg: &impl MsgSerde<M>) -> ah::Result<()> {
let txbuf = msg.msg_serialize()?;
let mut txcount = 0;
loop {
self.stream
.writable()
.await
.context("Socket polling (tx)")?;
match self.stream.try_write(&txbuf[txcount..]) {
Ok(n) => {
txcount += n;
if txcount >= txbuf.len() {
return Ok(());
}
}
Err(ref e) if e.kind() == ErrorKind::WouldBlock => (),
Err(e) => {
return Err(err!("Socket write: {e}"));
}
}
}
}
}
// vim: ts=4 sw=4 expandtab
|
