server/suser.rs

   1 // Copyright 2021 Ian Jackson and contributors to Hippotat
   2 // SPDX-License-Identifier: GPL-3.0-or-later
   3 // There is NO WARRANTY.
   4
   5 use super::*;
   6
   7 #[derive(Debug)]
   8 pub struct User {
   9   pub ic: Arc<InstanceConfig>,
  10   pub web: mpsc::Sender<WebRequest>,
  11   pub route: mpsc::Sender<RoutedPacket>,
  12 }
  13
  14 #[allow(unused_variables)] // xxx
  15 #[allow(unused_mut)] // xxx
  16 pub async fn run(global: Arc<Global>,
  17                  ic: Arc<InstanceConfig>,
  18                  mut web: mpsc::Receiver<WebRequest>,
  19                  mut routed: mpsc::Receiver<RoutedPacket>)
  20                  -> Result<Void, AE>
  21 {
  22   struct Outstanding {
  23     reply_to: oneshot::Sender<WebResponse>,
  24     oi: OutstandingInner,
  25   }
  26   #[derive(Debug)]
  27   struct OutstandingInner {
  28     target_requests_outstanding: u32,
  29   }
  30   let mut outstanding: VecDeque<Outstanding> = default();
  31   let mut downbound: PacketQueue<RoutedPacketData> = default();
  32
  33   let try_send_response = |
  34     reply_to: oneshot::Sender<WebResponse>,
  35     response: WebResponse
  36   | {
  37     reply_to.send(response)
  38       .unwrap_or_else(|_: WebResponse| () /* oh dear */ /* xxx trace? */);
  39   };
  40
  41   loop {
  42     if let Some(ret) = {
  43       if ! downbound.is_empty() {
  44         outstanding.pop_front()
  45       } else if let Some((i,_)) = outstanding.iter().enumerate().find({
  46         |(_,o)| outstanding.len() > o.oi.target_requests_outstanding.sat()
  47       }) {
  48         Some(outstanding.remove(i).unwrap())
  49       } else {
  50         None
  51       }
  52     } {
  53       let response = WebResponse {
  54         data: Ok(default()),
  55         warnings: default(),
  56       };
  57
  58       try_send_response(ret.reply_to, response);
  59     }
  60
  61     select!{
  62       biased;
  63
  64
  65       // xxx something something routed something
  66
  67       req = web.recv() =>
  68       {
  69         let WebRequest {
  70           initial, initial_remaining, length_hint, mut body,
  71           boundary_finder,
  72           reply_to, conn, mut warnings, may_route,
  73         } = req.ok_or_else(|| anyhow!("webservers all shut down!"))?;
  74
  75         match async {
  76
  77           let initial_used = initial.len() - initial_remaining;
  78
  79           let whole_request = read_limited_bytes(
  80             ic.max_batch_up.sat(),
  81             initial,
  82             length_hint,
  83             &mut body
  84           ).await.context("read request body")?;
  85
  86           let (meta, mut comps) =
  87             multipart::ComponentIterator::resume_mid_component(
  88               &whole_request[initial_used..],
  89               boundary_finder
  90             ).context("resume parsing body, after auth checks")?;
  91
  92           let mut meta = MetadataFieldIterator::new(&meta);
  93
  94           macro_rules! meta {
  95             { $v:ident, ( $( $badcmp:tt )? ), $ret:expr,
  96               let $server:ident, $client:ident $($code:tt)*
  97             } => {
  98               let $v = (||{
  99                 let $server = ic.$v;
 100                 let $client $($code)*
 101                 $(
 102                   if $client $badcmp $server {
 103                     throw!(anyhow!("mismatch: client={:?} {} server={:?}",
 104                                    $client, stringify!($badcmp), $server));
 105                   }
 106                 )?
 107                 Ok::<_,AE>($ret)
 108               })().context(stringify!($v))?;
 109               //dbg!(&$v);
 110             }
 111           }
 112           meta!{
 113             target_requests_outstanding, ( != ), client,
 114             let server, client: u32 = meta.need_parse()?;
 115           }
 116           meta!{
 117             http_timeout, ( > ), client,
 118             let server, client = Duration::from_secs(meta.need_parse()?);
 119           }
 120           meta!{
 121             mtu, ( != ), client,
 122             let server, client: u32 = meta.parse()?.unwrap_or(server);
 123           }
 124           meta!{
 125             max_batch_down, (), min(client, server),
 126             let server, client: u32 = meta.parse()?.unwrap_or(server);
 127           }
 128           meta!{
 129             max_batch_up, ( > ), client,
 130             let server, client = meta.parse()?.unwrap_or(server);
 131           }
 132
 133           while let Some(comp) = comps.next(&mut warnings, PartName::d)? {
 134             if comp.name != PartName::d {
 135               warnings.add(&format_args!("unexpected part {:?}", comp.name))?;
 136             }
 137             slip::processn(Mime2Slip, mtu, comp.payload, |header| {
 138               let saddr = ip_packet_addr::<false>(header)?;
 139               if saddr != ic.link.client.0 { throw!(PE::Src(saddr)) }
 140               let daddr = ip_packet_addr::<true>(header)?;
 141               Ok(daddr)
 142             }, |(daddr,packet)| route_packet(
 143               &global, &conn, Some(&ic.link.client), daddr,
 144               packet, may_route.clone(),
 145             ).map(Ok),
 146               |e| Ok::<_,SlipFramesError<_>>({ warnings.add(&e)?; })
 147             ).await?;
 148           }
 149
 150           let oi = OutstandingInner {
 151             target_requests_outstanding,
 152           };
 153           Ok::<_,AE>(oi)
 154         }.await {
 155           Ok(oi) => outstanding.push_back(Outstanding { reply_to, oi }),
 156           Err(e) => {
 157             try_send_response(reply_to, WebResponse {
 158               data: Err(e),
 159               warnings,
 160             });
 161           },
 162         }
 163       }
 164     }
 165   }
 166   //Err(anyhow!("xxx"))
 167 }