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use async_stream::stream;
use hyper::StatusCode;
use std::{
cmp::min, io::SeekFrom, num::ParseIntError
};
use tokio::io::{
AsyncReadExt, AsyncSeekExt
};
use warp::{
Filter, Rejection, http::HeaderValue, hyper::HeaderMap
};
pub fn filter_range() -> impl Filter<Extract = (Option<String>,), Error = Rejection> + Copy {
warp::header::optional::<String>("Range")
}
pub async fn get_range(range_header: Option<String>, file: &str, content_type: &str) -> Result<impl warp::Reply, Rejection> {
internal_get_range(range_header, file, content_type).await.map_err(|e| {
println!("Error in get_range: {}", e.message);
warp::reject()
})
}
fn get_range_params(range: &Option<String>, size: u64)->Result<(u64, u64), Error> {
match range {
Some(range) => {
let range: Vec<String> = range
.replace("bytes=", "")
.split("-")
.filter_map(|n| if n.len() > 0 {Some(n.to_string())} else {None})
.collect();
let start = if range.len() > 0 {
range[0].parse::<u64>()?
} else {
0
};
let end = if range.len() > 1 {
range[1].parse::<u64>()?
} else {
size-1
};
Ok((start, end))
},
None => Ok((0, size-1))
}
}
#[derive(Debug)]
struct Error {
message: String
}
impl From<std::io::Error> for Error {
fn from(err: std::io::Error) -> Self {
Error { message: err.to_string() }
}
}
impl From<ParseIntError> for Error {
fn from(err: ParseIntError) -> Self {
Error { message: err.to_string() }
}
}
async fn internal_get_range(range_header: Option<String>, file: &str, content_type: &str) -> Result<impl warp::Reply, Error> {
let mut file = tokio::fs::File::open(file).await?;
let metadata = file.metadata().await?;
let size = metadata.len();
let (start_range, end_range) = get_range_params(&range_header, size)?;
let byte_count = end_range - start_range + 1;
file.seek(SeekFrom::Start(start_range)).await?;
let stream = stream! {
let bufsize = 16384;
let cycles = byte_count / bufsize as u64 + 1;
let mut sent_bytes: u64 = 0;
for _ in 0..cycles {
let mut buffer: Vec<u8> = vec![0; min(byte_count - sent_bytes, bufsize) as usize];
let bytes_read = file.read_exact(&mut buffer).await.unwrap();
sent_bytes += bytes_read as u64;
yield Ok(buffer) as Result<Vec<u8>, hyper::Error>;
}
};
let body = hyper::Body::wrap_stream(stream);
let mut response = warp::reply::Response::new(body);
let headers = response.headers_mut();
let mut header_map = HeaderMap::new();
header_map.insert("Content-Type", HeaderValue::from_str(content_type).unwrap());
header_map.insert("Accept-Ranges", HeaderValue::from_str("bytes").unwrap());
header_map.insert("Content-Range", HeaderValue::from_str(&format!("bytes {}-{}/{}", start_range, end_range, size)).unwrap());
header_map.insert("Content-Length", HeaderValue::from(byte_count));
headers.extend(header_map);
if range_header.is_some() {
*response.status_mut() = StatusCode::PARTIAL_CONTENT;
}
Ok (response)
}