kafkaesque 0.0.15

Kafka implementations in Rust (Unofficial)
Documentation 
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use std::{
    hash::Hasher,
    pin::Pin,
    task::{Context, Poll},
};

#[derive(Default, Debug, Clone)]
pub struct Crc32(crc32fast::Hasher);

impl Crc32 {
    pub fn finalize(self) -> u32 {
        self.0.finalize()
    }
}

impl std::io::Write for Crc32 {
    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
        self.0.write(buf);
        Ok(buf.len())
    }
    fn flush(&mut self) -> std::io::Result<()> {
        Ok(())
    }
}

impl tokio::io::AsyncWrite for Crc32 {
    fn poll_write(
        mut self: Pin<&mut Self>,
        _cx: &mut Context<'_>,
        buf: &[u8],
    ) -> Poll<Result<usize, std::io::Error>> {
        Poll::Ready(std::io::Write::write(&mut *self, buf))
    }

    fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), std::io::Error>> {
        Poll::Ready(Ok(()))
    }

    fn poll_shutdown(
        self: Pin<&mut Self>,
        _cx: &mut Context<'_>,
    ) -> Poll<Result<(), std::io::Error>> {
        Poll::Ready(Ok(()))
    }
}