ptth/src/bin/server.rs

237 lines
5.0 KiB
Rust

use std::{
cmp::{min, max},
collections::*,
convert::{Infallible, TryInto},
error::Error,
io::SeekFrom,
path::PathBuf,
sync::Arc,
time::Duration,
};
use hyper::{
StatusCode,
Uri,
};
use lazy_static::*;
use regex::Regex;
use reqwest::{
Body,
Client,
};
use tokio::{
fs::File,
io::AsyncReadExt,
sync::mpsc::{
channel,
},
time::delay_for,
};
use ptth::http_serde;
fn parse_range_header (range_str: &str) -> (Option <u64>, Option <u64>) {
lazy_static! {
static ref RE: Regex = Regex::new (r"^bytes=(\d*)-(\d*)$").expect ("Couldn't compile regex for Range header");
}
println! ("{}", range_str);
let caps = match RE.captures (range_str) {
Some (x) => x,
_ => return (None, None),
};
let start = caps.get (1).map (|x| x.as_str ());
let end = caps.get (2).map (|x| x.as_str ());
let start = start.map (|x| u64::from_str_radix (x, 10).ok ()).flatten ();
let end = end.map (|x| u64::from_str_radix (x, 10).ok ()).flatten ();
(start, end)
}
async fn serve_file (
client: Arc <Client>,
mut f: File,
req_id: String,
should_send_body: bool,
range_start: Option <u64>,
range_end: Option <u64>
) {
let (tx, rx) = channel (2);
let body = if should_send_body {
Some (Body::wrap_stream (rx))
}
else {
None
};
let file_md = f.metadata ().await.unwrap ();
let file_len = file_md.len ();
let start = range_start.unwrap_or (0);
let end = range_end.unwrap_or (file_len);
let start = max (0, min (start, file_len));
let end = max (0, min (end, file_len));
f.seek (SeekFrom::Start (start)).await.unwrap ();
println! ("Serving range {}-{}", start, end);
if should_send_body {
tokio::spawn (async move {
//println! ("Opening file {:?}", path);
let mut tx = tx;
//let mut bytes_sent = 0;
let mut bytes_left = end - start;
loop {
let mut buffer = vec! [0u8; 65_536];
let bytes_read: u64 = f.read (&mut buffer).await.unwrap ().try_into ().unwrap ();
let bytes_read = min (bytes_left, bytes_read);
buffer.truncate (bytes_read.try_into ().unwrap ());
if bytes_read == 0 {
break;
}
if tx.send (Ok::<_, Infallible> (buffer)).await.is_err () {
break;
}
bytes_left -= bytes_read;
if bytes_left == 0 {
break;
}
//bytes_sent += bytes_read;
//println! ("Sent {} bytes", bytes_sent);
delay_for (Duration::from_millis (50)).await;
}
});
}
let mut headers: HashMap <String, Vec <u8>> = Default::default ();
headers.insert (String::from ("accept-ranges"), b"bytes".to_vec ());
let status_code;
if range_start.is_none () && range_end.is_none () {
headers.insert (String::from ("content-length"), end.to_string ().into_bytes ());
status_code = http_serde::StatusCode::Ok;
}
else {
headers.insert (String::from ("content-range"), format! ("bytes {}-{}/{}", start, end - 1, end).into_bytes ());
status_code = http_serde::StatusCode::PartialContent;
}
let resp_parts = http_serde::ResponseParts {
status_code,
headers,
};
let mut resp_req = client
.post (&format! ("http://127.0.0.1:4000/http_response/{}", req_id))
.header ("X-PTTH-2LJYXWC4", base64::encode (rmp_serde::to_vec (&resp_parts).unwrap ()));
if let Some (body) = body {
resp_req = resp_req.body (body);
}
//println! ("Step 6");
if let Err (e) = resp_req.send ().await {
println! ("Err: {:?}", e);
}
}
#[tokio::main]
async fn main () -> Result <(), Box <dyn Error>> {
let client = Arc::new (Client::new ());
let mut backoff_delay = 0;
loop {
if backoff_delay > 0 {
delay_for (Duration::from_millis (backoff_delay)).await;
}
let _uri = Uri::builder ()
.scheme ("http")
.authority ("127.0.0.1:4000")
.path_and_query ("/http_listen/alien_wildlands")
.build ().unwrap ();
let req_req = client.get ("http://127.0.0.1:4000/http_listen/alien_wildlands");
//println! ("Step 1");
let req_resp = match req_req.send ().await {
Err (e) => {
println! ("Err: {:?}", e);
backoff_delay = backoff_delay * 2 + 500;
continue;
},
Ok (r) => {
backoff_delay = 0;
r
},
};
if req_resp.status () != StatusCode::OK {
continue;
}
println! ("Step 3");
let body = req_resp.bytes ().await?;
let parts: http_serde::RequestParts = match rmp_serde::from_read_ref (&body)
{
Ok (x) => x,
_ => continue,
};
let (req_id, uri) = (parts.id, parts.uri);
println! ("Client requested {}", uri);
let mut range_start = None;
let mut range_end = None;
for (k, v) in parts.headers.iter () {
let v = std::str::from_utf8 (v).unwrap ();
//println! ("{}: {}", k, v);
if k == "range" {
let (start, end) = parse_range_header (v);
range_start = start;
range_end = end;
}
}
let should_send_body = match &parts.method {
http_serde::Method::Get => true,
_ => false,
};
//println! ("Step 6");
let client = client.clone ();
tokio::spawn (async move {
let mut path = PathBuf::from ("/home/user");
path.push (&uri [1..]);
let f = File::open (path).await.unwrap ();
serve_file (
client,
f,
req_id,
should_send_body,
range_start,
range_end
).await;
});
}
}