280 lines
5.8 KiB
Rust
280 lines
5.8 KiB
Rust
use std::{
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cmp::{min, max},
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collections::*,
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convert::{Infallible, TryInto},
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error::Error,
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io::SeekFrom,
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path::PathBuf,
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sync::Arc,
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time::Duration,
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};
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use hyper::{
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StatusCode,
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Uri,
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};
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use lazy_static::*;
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use regex::Regex;
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use reqwest::{
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Body,
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Client,
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};
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use tokio::{
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fs::File,
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io::AsyncReadExt,
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sync::mpsc::{
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channel,
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},
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time::delay_for,
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};
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use ptth::http_serde;
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fn parse_range_header (range_str: &str) -> (Option <u64>, Option <u64>) {
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lazy_static! {
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static ref RE: Regex = Regex::new (r"^bytes=(\d*)-(\d*)$").expect ("Couldn't compile regex for Range header");
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}
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println! ("{}", range_str);
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let caps = match RE.captures (range_str) {
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Some (x) => x,
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_ => return (None, None),
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};
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let start = caps.get (1).map (|x| x.as_str ());
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let end = caps.get (2).map (|x| x.as_str ());
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let start = start.map (|x| u64::from_str_radix (x, 10).ok ()).flatten ();
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let end = end.map (|x| u64::from_str_radix (x, 10).ok ()).flatten ();
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(start, end)
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}
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const SERVER_URL: &str = "http://127.0.0.1:4000";
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async fn serve_response (
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client: &Client,
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req_id: String,
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resp_parts: http_serde::ResponseParts,
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body: Option <Body>
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) {
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let mut resp_req = client
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.post (&format! ("{}/http_response/{}", SERVER_URL, req_id))
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.header ("X-PTTH-2LJYXWC4", base64::encode (rmp_serde::to_vec (&resp_parts).unwrap ()));
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if let Some (body) = body {
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resp_req = resp_req.body (body);
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}
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//println! ("Step 6");
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if let Err (e) = resp_req.send ().await {
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println! ("Err: {:?}", e);
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}
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}
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async fn serve_file (
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client: &Client,
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mut f: File,
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req_id: String,
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should_send_body: bool,
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range_start: Option <u64>,
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range_end: Option <u64>
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) {
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let (tx, rx) = channel (2);
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let body = if should_send_body {
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Some (Body::wrap_stream (rx))
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}
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else {
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None
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};
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let file_md = f.metadata ().await.unwrap ();
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let file_len = file_md.len ();
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let start = range_start.unwrap_or (0);
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let end = range_end.unwrap_or (file_len);
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let start = max (0, min (start, file_len));
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let end = max (0, min (end, file_len));
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f.seek (SeekFrom::Start (start)).await.unwrap ();
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println! ("Serving range {}-{}", start, end);
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if should_send_body {
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tokio::spawn (async move {
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//println! ("Opening file {:?}", path);
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let mut tx = tx;
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//let mut bytes_sent = 0;
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let mut bytes_left = end - start;
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loop {
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let mut buffer = vec! [0u8; 65_536];
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let bytes_read: u64 = f.read (&mut buffer).await.unwrap ().try_into ().unwrap ();
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let bytes_read = min (bytes_left, bytes_read);
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buffer.truncate (bytes_read.try_into ().unwrap ());
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if bytes_read == 0 {
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break;
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}
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if tx.send (Ok::<_, Infallible> (buffer)).await.is_err () {
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break;
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}
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bytes_left -= bytes_read;
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if bytes_left == 0 {
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break;
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}
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//bytes_sent += bytes_read;
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//println! ("Sent {} bytes", bytes_sent);
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delay_for (Duration::from_millis (50)).await;
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}
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});
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}
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let mut headers: HashMap <String, Vec <u8>> = Default::default ();
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headers.insert (String::from ("accept-ranges"), b"bytes".to_vec ());
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let status_code;
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if range_start.is_none () && range_end.is_none () {
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headers.insert (String::from ("content-length"), end.to_string ().into_bytes ());
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status_code = http_serde::StatusCode::Ok;
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}
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else {
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headers.insert (String::from ("content-range"), format! ("bytes {}-{}/{}", start, end - 1, end).into_bytes ());
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status_code = http_serde::StatusCode::PartialContent;
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}
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let resp_parts = http_serde::ResponseParts {
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status_code,
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headers,
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};
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serve_response (client, req_id, resp_parts, body).await;
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}
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async fn serve_error (
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client: &Client,
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req_id: String,
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status_code: ptth::http_serde::StatusCode
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) {
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let headers: HashMap <String, Vec <u8>> = Default::default ();
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let resp_parts = http_serde::ResponseParts {
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status_code,
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headers,
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};
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serve_response (client, req_id, resp_parts, Some ("404 Not Found".into ())).await;
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}
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async fn handle_all (
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client: Arc <Client>,
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req_resp: reqwest::Response
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) -> Result <(), Box <dyn Error>> {
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//println! ("Step 1");
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if req_resp.status () != StatusCode::OK {
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// TODO: Error handling
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return Ok (());
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}
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println! ("Step 3");
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let body = req_resp.bytes ().await?;
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let parts: http_serde::RequestParts = match rmp_serde::from_read_ref (&body)
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{
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Ok (x) => x,
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_ => return Ok (()),
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};
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let (req_id, uri) = (parts.id, parts.uri);
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println! ("Client requested {}", uri);
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let mut range_start = None;
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let mut range_end = None;
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for (k, v) in parts.headers.iter () {
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let v = std::str::from_utf8 (v).unwrap ();
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//println! ("{}: {}", k, v);
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if k == "range" {
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let (start, end) = parse_range_header (v);
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range_start = start;
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range_end = end;
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}
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}
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let should_send_body = match &parts.method {
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http_serde::Method::Get => true,
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_ => false,
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};
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//println! ("Step 6");
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let mut path = PathBuf::from ("/home/user");
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path.push (&uri [1..]);
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match File::open (path).await {
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Ok (f) => serve_file (
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&client,
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f,
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req_id,
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should_send_body,
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range_start,
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range_end
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).await,
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Err (_) => {
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serve_error (
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&client,
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req_id,
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ptth::http_serde::StatusCode::NotFound
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).await;
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},
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}
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Ok (())
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}
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#[tokio::main]
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async fn main () -> Result <(), Box <dyn Error>> {
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let client = Arc::new (Client::new ());
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let mut backoff_delay = 0;
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loop {
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if backoff_delay > 0 {
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delay_for (Duration::from_millis (backoff_delay)).await;
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}
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let req_req = client.get ("http://127.0.0.1:4000/http_listen/alien_wildlands");
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let req_resp = match req_req.send ().await {
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Err (e) => {
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println! ("Err: {:?}", e);
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backoff_delay = backoff_delay * 2 + 500;
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continue;
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},
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Ok (r) => {
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backoff_delay = 0;
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r
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},
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};
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// Spawn another task for each request so we can immediately listen
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// for the next connection
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let client = client.clone ();
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tokio::spawn (async move {
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handle_all (client, req_resp).await;
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});
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}
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}
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