levin 0.1.0

Library for the Levin p2p protocol
Documentation 
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use serde::{de::DeserializeOwned, Serialize};
use std::io::{Read, Write};

use crate::byte_counter::ByteCounter;
use crate::constants::LEVIN_HEADER_SIZE;
use crate::error::Result;
use crate::header::Header;

pub struct Bucket<'a, P> {
    header: &'a mut Header,
    payload: P,
}

pub type InputBucket<'a, 'b, P> = Bucket<'a, &'b mut P>;
pub type OutputBucket<'a, 'b, P> = Bucket<'a, &'b P>;

impl<'a, 'b, P> InputBucket<'a, 'b, P>
where
    P: DeserializeOwned,
{
    pub fn input<R: Read>(&mut self, mut reader: R) -> Result<()> {
        *self.header = Header::from_reader(reader.by_ref())?;
        *self.payload = serde_epee::from_reader(reader)?;
        Ok(())
    }
}

impl<'a, 'b, P> OutputBucket<'a, 'b, P>
where
    P: Serialize,
{
    pub fn output<W: Write>(&mut self, mut writer: W) -> Result<()> {
        // Do a psudeo-serialize to ByteCounter to be able to set the payload length in Header
        let mut pl_byte_counter = ByteCounter::default();
        serde_epee::to_writer(pl_byte_counter.by_ref(), &self.payload)?;
        self.header.set_payload_length(pl_byte_counter.count);

        self.header.to_writer(writer.by_ref())?;
        serde_epee::to_writer(writer, &self.payload)?;
        Ok(())
    }

    pub fn output_to_vec(&mut self) -> Result<Vec<u8>> {
        // Do a psudeo-serialize to ByteCounter to be able to set the payload length in Header
        let mut pl_byte_counter = ByteCounter::default();
        serde_epee::to_writer(pl_byte_counter.by_ref(), &self.payload)?;
        self.header.set_payload_length(pl_byte_counter.count);
        let total_bucket_size = LEVIN_HEADER_SIZE + pl_byte_counter.count;

        let mut res = Vec::<u8>::with_capacity(total_bucket_size);
        self.header.to_writer(res.by_ref())?;
        serde_epee::to_writer(res.by_ref(), &self.payload)?;
        Ok(res)
    }
}