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#![allow(clippy::missing_safety_doc)]
use self::channel::ShmemChannel;
use eyre::{eyre, Context};
use serde::{Deserialize, Serialize};
pub use shared_memory_extended::{Shmem, ShmemConf};
use std::marker::PhantomData;
use std::time::Duration;
mod channel;
pub struct ShmemServer<T, U> {
channel: ShmemChannel,
reply_expected: bool,
phantom: PhantomData<(T, U)>,
}
impl<T, U> ShmemServer<T, U> {
pub unsafe fn new(memory: Shmem) -> eyre::Result<Self> {
Ok(Self {
channel: ShmemChannel::new_server(memory)?,
reply_expected: false,
phantom: PhantomData,
})
}
pub fn listen(&mut self) -> eyre::Result<Option<T>>
where
T: for<'a> Deserialize<'a> + std::fmt::Debug,
{
assert!(!self.reply_expected);
let result = self.channel.receive(None);
if matches!(result, Ok(Some(_))) {
self.reply_expected = true;
}
result
}
pub fn send_reply(&mut self, value: &U) -> eyre::Result<()>
where
U: Serialize + std::fmt::Debug,
{
assert!(self.reply_expected);
self.channel.send(value)?;
self.reply_expected = false;
Ok(())
}
}
pub struct ShmemClient<T, U> {
channel: ShmemChannel,
timeout: Option<Duration>,
phantom: PhantomData<(T, U)>,
}
impl<T, U> ShmemClient<T, U> {
pub unsafe fn new(memory: Shmem, timeout: Option<Duration>) -> eyre::Result<Self> {
Ok(Self {
channel: ShmemChannel::new_client(memory)?,
timeout,
phantom: PhantomData,
})
}
pub fn request(&mut self, value: &T) -> eyre::Result<U>
where
T: Serialize + std::fmt::Debug,
U: for<'a> Deserialize<'a> + std::fmt::Debug,
{
self.channel
.send(value)
.wrap_err("failed to send request")?;
self.channel
.receive(self.timeout)
.wrap_err("failed to receive reply")?
.ok_or_else(|| eyre!("server disconnected unexpectedly"))
}
}
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