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use std::convert::TryInto;
use std::io::{copy, Read, Result as IoResult, Seek, SeekFrom, Write};
#[derive(Debug, Clone, Copy)]
pub enum BodyKind {
Empty,
KnownLength(u64),
Chunked,
}
pub trait BodyWriter {
fn kind(&mut self) -> IoResult<BodyKind>;
fn write<W: Write>(&mut self, writer: W) -> IoResult<()>;
}
#[derive(Debug, Clone, Copy)]
pub struct EmptyBody;
impl BodyWriter for EmptyBody {
fn kind(&mut self) -> IoResult<BodyKind> {
Ok(BodyKind::Empty)
}
fn write<W: Write>(&mut self, _writer: W) -> IoResult<()> {
Ok(())
}
}
#[derive(Debug, Clone)]
pub struct MemBody<B>(pub B);
impl<B: AsRef<[u8]>> BodyWriter for MemBody<B> {
fn kind(&mut self) -> IoResult<BodyKind> {
let len = self.0.as_ref().len().try_into().unwrap();
Ok(BodyKind::KnownLength(len))
}
fn write<W: Write>(&mut self, mut writer: W) -> IoResult<()> {
writer.write_all(self.0.as_ref())?;
Ok(())
}
}
#[derive(Debug, Clone)]
pub struct IoBody<B>(pub B);
impl<B: Seek + Read> BodyWriter for IoBody<B> {
fn kind(&mut self) -> IoResult<BodyKind> {
let len = self.0.seek(SeekFrom::End(0))?;
Ok(BodyKind::KnownLength(len))
}
fn write<W: Write>(&mut self, mut writer: W) -> IoResult<()> {
self.0.seek(SeekFrom::Start(0))?;
copy(&mut self.0, &mut writer)?;
Ok(())
}
}
#[cfg(feature = "flate2")]
pub mod compressed_body {
use super::*;
use flate2::write::GzEncoder;
#[derive(Debug, Clone)]
pub struct CompressedBody<B>(pub B);
impl<B: BodyWriter> BodyWriter for CompressedBody<B> {
fn kind(&mut self) -> IoResult<BodyKind> {
Ok(BodyKind::Chunked)
}
fn write<W: Write>(&mut self, writer: W) -> IoResult<()> {
let mut writer = GzEncoder::new(writer, Default::default());
self.0.write(&mut writer)?;
writer.finish()?;
Ok(())
}
}
}
#[cfg(feature = "json")]
pub mod json_body {
use super::*;
use std::io::BufWriter;
use serde::ser::Serialize;
use serde_json::ser::to_writer;
#[derive(Debug, Clone)]
pub struct JsonBody<B>(pub B);
impl<B: Serialize> BodyWriter for JsonBody<B> {
fn kind(&mut self) -> IoResult<BodyKind> {
Ok(BodyKind::Chunked)
}
fn write<W: Write>(&mut self, writer: W) -> IoResult<()> {
let mut writer = BufWriter::new(writer);
to_writer(&mut writer, &self.0)?;
writer.flush()?;
Ok(())
}
}
}