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::*;
6 use hippotat_macros::into_crlfs;
8 type OutstandingRequest<'r> = Pin<Box<
9 dyn Future<Output=Option<Bytes>> + Send + 'r
12 impl<T> HCC for T where
13 T: hyper::client::connect::Connect + Clone + Send + Sync + 'static { }
14 trait HCC: hyper::client::connect::Connect + Clone + Send + Sync + 'static { }
16 struct ClientContext<'c,C> {
17 ic: &'c InstanceConfig,
18 hclient: &'c Arc<hyper::Client<C>>,
19 reporter: &'c parking_lot::Mutex<Reporter<'c>>,
23 fn submit_request<'r, 'c:'r, C:HCC>(
24 c: &'c ClientContext<C>,
25 reqs: &mut Vec<OutstandingRequest<'r>>,
28 let show_timeout = c.ic.http_timeout
29 .saturating_add(Duration::from_nanos(999_999_999))
32 let time_t = SystemTime::now()
33 .duration_since(UNIX_EPOCH)
34 .unwrap_or_else(|_| Duration::default()) // clock is being weird
36 let time_t = format!("{:x}", time_t);
37 let hmac = token_hmac(c.ic.secret.0.as_bytes(), time_t.as_bytes());
38 let mut token = time_t;
39 write!(token, " ").unwrap();
40 base64::encode_config_buf(&hmac, BASE64_CONFIG, &mut token);
42 let prefix1 = format!(into_crlfs!(
44 Content-Type: text/plain; charset="utf-8"
45 Content-Disposition: form-data; name="m"
53 c.ic.target_requests_outstanding,
57 let prefix2 = format!(into_crlfs!(
60 Content-Type: application/octet-stream
61 Content-Disposition: form-data; name="d"
65 let suffix = format!(into_crlfs!(
71 let body = hyper::body::Body::wrap_stream(
72 futures::stream::iter(itertools::chain![
73 array::IntoIter::new([
74 Ok::<Bytes,Void>( prefix1.into() ),
75 Ok::<Bytes,Void>( prefix2.into() ),
77 if upbound.is_empty() { 1 } else { 2 }
79 Itertools::intersperse(
80 upbound.into_iter().map(|u| Bytes::from(u)),
82 ).map(Ok::<Bytes,Void>),
83 [ Ok::<Bytes,Void>( suffix.into() ) ],
87 let req = hyper::Request::post(&c.ic.url).body(body)
88 .context("construct request")?;
90 let resp = c.hclient.request(req);
91 let fut = Box::pin(async move {
92 let r = async { tokio::time::timeout( c.ic.http_timeout, async {
93 let resp = resp.await.context("make request")?;
94 let status = resp.status();
95 let resp = resp.into_body();
96 // xxx: some size limit to avoid mallocing the universe
97 let resp = hyper::body::to_bytes(resp).await
98 .context("HTTP error fetching response body")?;
100 if ! status.is_success() {
101 // xxx get body and log it
102 throw!(anyhow!("HTTP error status={} body={:?}",
103 &status, String::from_utf8_lossy(&resp)));
109 let r = c.reporter.lock().report(r);
112 tokio::time::sleep(c.ic.http_retry).await;
119 #[allow(unused_variables)] // xxx
120 async fn run_client<C:HCC>(
122 hclient: Arc<hyper::Client<C>>
123 ) -> Result<Void, AE>
125 debug!("{}: config: {:?}", &ic, &ic);
127 let reporter = parking_lot::Mutex::new(Reporter::new(&ic));
129 let c = ClientContext {
135 let mut ipif = tokio::process::Command::new("sh")
136 .args(&["-c", &ic.ipif])
137 .stdin (process::Stdio::piped())
138 .stdout(process::Stdio::piped())
139 .stderr(process::Stdio::piped())
141 .spawn().context("spawn ipif")?;
143 let stderr = ipif.stderr.take().unwrap();
144 let ic_name = ic.to_string();
145 let _ = task::spawn(async move {
146 let mut stderr = tokio::io::BufReader::new(stderr).lines();
147 while let Some(l) = stderr.next_line().await? {
148 error!("{}: ipif stderr: {}", &ic_name, l.trim_end());
150 Ok::<_,io::Error>(())
153 let tx_stream = ipif.stdout.take().unwrap();
154 let mut tx_stream = tokio::io::BufReader::new(tx_stream).split(SLIP_ESC);
155 let mut tx_defer = None;
157 let stream_for_rx = ipif.stdin .take().unwrap();
159 let mut reqs: Vec<OutstandingRequest>
160 = Vec::with_capacity(ic.max_requests_outstanding.sat());
162 // xxx check that ic settings are all honoured
168 // cancellation safety: if this future is polled, we might
169 // move out of tx_defer, but then we will be immediately
170 // ready and yield it inot packet
171 if let Some(y) = tx_defer.take() {
174 tx_stream.next_segment().await
177 if tx_defer.is_none() &&
178 reqs.len() < ic.max_requests_outstanding.sat() =>
180 let mut upbound = Frames::default();
181 let mut to_process: Option<Result<Option<Vec<u8>>,_>>
183 while let Some(packet) = to_process.take() {
185 packet.context("read from ipif")?
186 .ok_or_else(|| io::Error::from(io::ErrorKind::UnexpectedEof))?;
187 if let Ok(()) = check_checkmtu_mimeswap
188 ::<true>(&ic, &mut packet)
190 match upbound.add(ic.max_batch_up, packet) {
192 tx_defer = Some(packet);
197 // we rely oin `next_segment` being cancellation-safe,
198 // which isn't documented as true but seems reasonably safe
199 pin!{ let next_segment = tx_stream.next_segment(); }
200 to_process = match poll!(next_segment) {
201 Poll::Ready(p) => Some(p),
202 Poll::Pending => None,
206 assert!( to_process.is_none() );
207 dbg!(&reqs.len(), &upbound);
209 //: impl futures::Stream<Cow<&[u8]>>
210 submit_request(&c, &mut reqs, upbound.into())?;
214 if reqs.len() < ic.target_requests_outstanding.sat() ||
215 (tx_defer.is_some() &&
216 reqs.len() < ic.max_requests_outstanding.sat()) =>
218 let upbound = tx_defer.take().into_iter().collect_vec();
219 submit_request(&c, &mut reqs, upbound)?;
222 (got, goti, _) = async { future::select_all(&mut reqs).await },
223 if ! reqs.is_empty() =>
225 reqs.swap_remove(goti);
226 if let Some(got) = got {
227 dbg!(&got.remaining()); // xxx
236 async fn main() -> Result<(), AE> {
237 let ics = config::read(LinkEnd::Client)?;
238 if ics.is_empty() { throw!(anyhow!("no associations with server(s)")); }
242 let https = HttpsConnector::new();
243 let hclient = hyper::Client::builder().build::<_, hyper::Body>(https);
244 let hclient = Arc::new(hclient);
247 let () = future::select_all(
248 ics.into_iter().map(|ic| Box::pin(async {
249 let assocname = ic.to_string();
250 info!("{} starting", &assocname);
251 let hclient = hclient.clone();
252 let join = task::spawn(async {
253 run_client(ic, hclient).await.void_unwrap_err()
257 error!("{} failed: {:?}", &assocname, e);
260 error!("{} panicked!", &assocname);
261 panic::resume_unwind(je.into_panic());
267 error!("quitting because one of your client connections crashed");