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use std::collections::HashMap;
use bytes::{Buf, BufMut, BytesMut};
use flate2::{
read::{GzDecoder, GzEncoder},
Compression,
};
use lazy_static::lazy_static;
pub const GRPC_ACCEPT_ENCODING: &str = "grpc-accept-encoding";
pub const GRPC_ENCODING: &str = "grpc-encoding";
#[derive(Debug, Clone, Copy)]
pub enum CompressionEncoding {
Gzip,
}
lazy_static! {
pub static ref COMPRESSIONS: HashMap<String, Option<CompressionEncoding>> = {
let mut v = HashMap::new();
v.insert("gzip".to_string(), Some(CompressionEncoding::Gzip));
v
};
}
impl CompressionEncoding {
pub fn from_accept_encoding(header: &http::HeaderMap) -> Option<CompressionEncoding> {
let accept_encoding = header.get(GRPC_ACCEPT_ENCODING)?;
let encodings = accept_encoding.to_str().ok()?;
encodings
.trim()
.split(',')
.map(|s| s.trim())
.into_iter()
.find_map(|s| match s {
"gzip" => Some(CompressionEncoding::Gzip),
_ => None,
})
}
pub fn into_header_value(self) -> http::HeaderValue {
match self {
CompressionEncoding::Gzip => http::HeaderValue::from_static("gzip"),
}
}
}
pub fn compress(
encoding: CompressionEncoding,
src: &mut BytesMut,
dst: &mut BytesMut,
len: usize,
) -> Result<(), std::io::Error> {
dst.reserve(len);
match encoding {
CompressionEncoding::Gzip => {
let mut en = GzEncoder::new(src.reader(), Compression::default());
let mut dst_writer = dst.writer();
std::io::copy(&mut en, &mut dst_writer)?;
}
}
Ok(())
}
pub fn decompress(
encoding: CompressionEncoding,
src: &mut BytesMut,
dst: &mut BytesMut,
len: usize,
) -> Result<(), std::io::Error> {
let capacity = len * 2;
dst.reserve(capacity);
match encoding {
CompressionEncoding::Gzip => {
let mut de = GzDecoder::new(src.reader());
let mut dst_writer = dst.writer();
std::io::copy(&mut de, &mut dst_writer)?;
}
}
Ok(())
}
#[test]
fn test_compress() {
let mut src = BytesMut::with_capacity(super::consts::BUFFER_SIZE);
src.put(&b"test compress"[..]);
let mut dst = BytesMut::new();
let len = src.len();
src.reserve(len);
compress(CompressionEncoding::Gzip, &mut src, &mut dst, len).unwrap();
println!("src: {:?}, dst: {:?}", src, dst);
let mut de_dst = BytesMut::with_capacity(super::consts::BUFFER_SIZE);
let de_len = dst.len();
decompress(CompressionEncoding::Gzip, &mut dst, &mut de_dst, de_len).unwrap();
println!("src: {:?}, dst: {:?}", dst, de_dst);
}