http-fs 2.0.1

HTTP File Service library
Documentation 
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use crate::config::{FileServeConfig, FsTaskSpawner};
use crate::file::ChunkedReadFile;

use std::io;
use core::{mem, task, future};
use core::pin::Pin;

///File serving body for `hyper` Service
pub enum Body<W: FsTaskSpawner, C: FileServeConfig> {
    ///Full
    Full(bytes::Bytes),
    ///Chunked file read
    Chunked(ChunkedReadFile<W, C>)
}

impl<W: FsTaskSpawner, C: FileServeConfig> Body<W, C> {
    #[inline(always)]
    ///Creates empty body
    pub const fn empty() -> Self {
        Self::Full(bytes::Bytes::new())
    }

    ///Method to fetch next chunk within `Future` interface
    pub fn poll_next(self: Pin<&mut Self>, ctx: &mut task::Context<'_>) -> task::Poll<Option<Result<bytes::Bytes, io::Error>>> {
        match self.get_mut() {
            Self::Full(bytes) => {
                if bytes.is_empty() {
                    task::Poll::Ready(None)
                } else {
                    let mut result = bytes::Bytes::new();
                    mem::swap(&mut result, bytes);
                    task::Poll::Ready(Some(Ok(result)))
                }
            },
            Self::Chunked(chunked) => match future::Future::poll(Pin::new(chunked), ctx) {
                task::Poll::Pending => task::Poll::Pending,
                task::Poll::Ready(Ok(Some(result))) => {
                    task::Poll::Ready(Some(Ok(result)))
                }
                task::Poll::Ready(Ok(None)) => task::Poll::Ready(None),
                task::Poll::Ready(Err(error)) => task::Poll::Ready(Some(Err(error))),
            }
        }
    }

    #[inline(always)]
    ///Returns whether body is finished to be served.
    pub fn is_finished(&self) -> bool {
        match self {
            Self::Full(bytes) => bytes.is_empty(),
            Self::Chunked(chunked) => chunked.is_finished(),
        }
    }

    #[inline(always)]
    ///Remaining length
    pub fn len(&self) -> u64 {
        match self {
            Self::Full(bytes) => bytes.len() as u64,
            Self::Chunked(chunked) => chunked.remaining()
        }
    }
}

impl<W: FsTaskSpawner, C: FileServeConfig> From<bytes::Bytes> for Body<W, C> {
    #[inline(always)]
    fn from(bytes: bytes::Bytes) -> Self {
        Body::Full(bytes)
    }
}

impl<W: FsTaskSpawner, C: FileServeConfig> From<ChunkedReadFile<W, C>> for Body<W, C> {
    #[inline(always)]
    fn from(chunked: ChunkedReadFile<W, C>) -> Self {
        Body::Chunked(chunked)
    }
}

impl<W: FsTaskSpawner, C: FileServeConfig> From<Option<ChunkedReadFile<W, C>>> for Body<W, C> {
    #[inline(always)]
    fn from(chunked: Option<ChunkedReadFile<W, C>>) -> Self {
        match chunked {
            Some(chunked) => chunked.into(),
            None => Self::empty()
        }
    }
}