1 // Copyright 2021 Ian Jackson and contributors to Hippotat
2 // SPDX-License-Identifier: AGPL-3.0-or-later
3 // There is NO WARRANTY.
5 use hippotat::prelude::*;
9 requests_outstanding: Vec<>,
10 tx_read_stream: something,
11 rx_write_stream: something,
14 #[allow(unused_variables)] // xxx
15 async fn run_client<C>(ic: InstanceConfig, hclient: Arc<hyper::Client<C>>)
17 where C: hyper::client::connect::Connect + Clone + Send + Sync + 'static,
19 debug!("{}: config: {:?}", &ic, &ic);
21 let mut reporter = Reporter { };
23 let mut ipif = tokio::process::Command::new("sh")
24 .args(&["-c", &ic.ipif])
25 .stdin (process::Stdio::piped())
26 .stdout(process::Stdio::piped())
27 .stderr(process::Stdio::piped())
29 .spawn().context("spawn ipif")?;
31 let stderr = ipif.stderr.take().unwrap();
32 let ic_name = ic.to_string();
33 let _ = task::spawn(async move {
34 let mut stderr = tokio::io::BufReader::new(stderr).lines();
35 while let Some(l) = stderr.next_line().await? {
36 error!("{}: ipif stderr: {}", &ic_name, l.trim_end());
41 let tx_stream = ipif.stdout.take().unwrap();
42 let mut tx_stream = tokio::io::BufReader::new(tx_stream).split(SLIP_ESC);
43 let mut tx_defer = None;
45 let stream_for_rx = ipif.stdin .take().unwrap();
47 let mut reqs: Vec<Pin<Box<
48 dyn Future<Output=Result<Bytes,AE>>
49 >>> = Vec::with_capacity(ic.max_requests_outstanding.sat());
51 // xxx check that ic settings are all honoured
56 packet = tx_stream.next_segment(),
57 if tx_defer.is_none() &&
58 reqs.len() < ic.max_requests_outstanding.sat() =>
60 let mut upbound_total = 0;
61 let mut upbound: Vec<Vec<u8>> = vec![];
62 let mut to_process: Option<Result<Option<Vec<u8>>,_>>
64 while let Some(packet) = to_process.take() {
66 packet.context("read from ipif")?
67 .ok_or_else(|| io::Error::from(io::ErrorKind::UnexpectedEof))?;
68 if let Ok(()) = slip::check_checkmtu_mimeify(&mut packet, &ic) {
69 let new_upbound_total = packet.len() + upbound_total + 1;
70 if new_upbound_total > ic.max_batch_up.sat() {
71 tx_defer = Some(packet);
74 upbound_total = new_upbound_total;
76 // we rely oin `next_segment` being cancellation-safe,
77 // which isn't documented as true but seems reasonably safe
78 pin!{ let next_segment = tx_stream.next_segment(); }
79 to_process = match poll!(next_segment) {
80 Poll::Ready(p) => Some(p),
81 Poll::Pending => None,
85 assert!( to_process.is_none() );
86 dbg!(&reqs.len(), &upbound_total, &upbound.len());
88 //: impl futures::Stream<Cow<&[u8]>>
89 let body = hyper::body::Body::wrap_stream(
90 futures::stream::iter(
91 Itertools::intersperse(
92 upbound.into_iter().map(|u| Bytes::from(u)),
93 slip::SLIP_END_SLICE.into()
98 let req = hyper::Request::post(&ic.url).body(body)
99 .context("construct request")?;
101 let resp = hclient.request(req);
102 let fut = Box::pin(async {
103 let r = async { tokio::time::timeout( ic.http_timeout, async {
104 let resp = resp.await.context("make request")?;
105 if ! resp.status().is_success() {
106 throw!(anyhow!("HTTP error status {}", &resp.status()));
108 let resp = resp.into_body();
109 // xxx: some size limit to avoid mallocing the universe
110 let resp = hyper::body::to_bytes(resp).await
111 .context("HTTP error fetching response body")?;
115 tokio::time::sleep(ic.http_retry).await;
122 (got, goti, _) = async { future::select_all(&mut reqs).await },
123 if ! reqs.is_empty() =>
125 reqs.swap_remove(goti);
126 if let Some(got) = reporter.report(got) {
127 dbg!(&got.remaining()); // xxx
136 async fn main() -> Result<(), AE> {
137 let ics = config::read(LinkEnd::Client)?;
138 if ics.is_empty() { throw!(anyhow!("no associations with server(s)")); }
142 let https = HttpsConnector::new();
143 let hclient = hyper::Client::builder().build::<_, hyper::Body>(https);
144 let hclient = Arc::new(hclient);
147 let () = future::select_all(
148 ics.into_iter().map(|ic| Box::pin(async {
149 let assocname = ic.to_string();
150 info!("{} starting", &assocname);
151 let hclient = hclient.clone();
152 let join = task::spawn(async {
153 run_client(ic, hclient).await.void_unwrap_err()
157 error!("{} failed: {:?}", &assocname, e);
160 error!("{} panicked!", &assocname);
161 panic::resume_unwind(je.into_panic());
167 error!("quitting because one of your client connections crashed");