npsd 0.2.0

Network payload serializer / deserializer framework
Documentation 
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use core::str;
use std::str::FromStr;

use super::{Error, AsyncMiddleware, AsyncPayload, AsyncIntoPayload, AsyncFromPayload};

impl<C: Send + Sync> AsyncIntoPayload<C> for char {
    #[inline]
    async fn poll_into_payload<'m, M: AsyncMiddleware<'m>>(&self, ctx: &mut C, next: &mut M) -> Result<(), Error> {
        next.poll_into_payload(&(*self as u32).to_be_bytes(), ctx).await
    }
}

impl<'a, C: Send + Sync> AsyncFromPayload<'a, C> for char {
    async fn poll_from_payload<M: AsyncMiddleware<'a>>(ctx: &mut C, next: &mut M) -> Result<Self, Error> {
        let ch: u32 = next.poll_from_payload(ctx).await?;

        if let Some(ch) = char::from_u32(ch) {
            Ok(ch)
        } else {
            Err(Error::UnknownVariant("Exptected char from u32".to_string()))
        }
    }
}

impl<'a, C: Send + Sync> AsyncPayload<'a, C> for char {}

impl<'a, C: Send + Sync> AsyncIntoPayload<C> for &'a str {
    #[inline]
    async fn poll_into_payload<'m, M: AsyncMiddleware<'m>>(&self, ctx: &mut C, next: &mut M) -> Result<(), Error> {
        next.poll_into_payload(&self.as_bytes(), ctx).await
    }
}

impl<'a, C: Send + Sync> AsyncFromPayload<'a, C> for &'a str {
    async fn poll_from_payload<M: AsyncMiddleware<'a>>(ctx: &mut C, next: &mut M) -> Result<Self, Error> {
        let nbytes: usize = next.poll_from_payload(ctx).await?;

        str::from_utf8(next.poll_read(nbytes).await?).map_err(|e| {
            Error::InvalidUtf8(e.to_string())
        })
    }
}

impl<'a, C: Send + Sync> AsyncPayload<'a, C> for &'a str {}

impl<'a, C: Send + Sync> AsyncIntoPayload<C> for &'a mut str {
    #[inline]
    async fn poll_into_payload<'m, M: AsyncMiddleware<'m>>(&self, ctx: &mut C, next: &mut M) -> Result<(), Error> {
        next.poll_into_payload(&self.as_bytes(), ctx).await
    }
}

impl<'a, C: Send + Sync> AsyncFromPayload<'a, C> for &'a mut str {
    async fn poll_from_payload<M: AsyncMiddleware<'a>>(ctx: &mut C, next: &mut M) -> Result<Self, Error> {
        let nbytes: usize = next.poll_from_payload(ctx).await?;
        
        str::from_utf8_mut(next.poll_read_mut(nbytes).await?).map_err(|e| {
            Error::InvalidUtf8(e.to_string())
        })
    }
}

impl<'a, C: Send + Sync> AsyncPayload<'a, C> for &'a mut str {}

impl<C: Send + Sync> AsyncIntoPayload<C> for String {
    async fn poll_into_payload<'m, M: AsyncMiddleware<'m>>(&self, ctx: &mut C, next: &mut M) -> Result<(), Error> {
        next.poll_into_payload(&self.as_bytes(), ctx).await
    }
}

impl<'a, C: Send + Sync> AsyncFromPayload<'a, C> for String {
    async fn poll_from_payload<M: AsyncMiddleware<'a>>(ctx: &mut C, next: &mut M) -> Result<Self, Error> {
        String::from_str(next.poll_from_payload(ctx).await?).map_err(|e| {
            Error::InvalidUtf8(e.to_string())
        })
    }
}

impl<'a, C: Send + Sync> AsyncPayload<'a, C> for String {}