WIP

streams/src/collect.rs

@@ -1,5 +1,6 @@
 use err::Error;
 use futures_util::Future;
+use futures_util::FutureExt;
 use futures_util::Stream;
 use futures_util::StreamExt;
 use items_0::collect_s::Collectable;
@@ -46,28 +47,161 @@ macro_rules! trace4 {
 pub struct Collect {
     inp: CollectableStreamBox,
     deadline: Instant,
+    events_max: u64,
+    range: Option<SeriesRange>,
+    binrange: Option<BinnedRangeEnum>,
+    collector: Option<Box<dyn Collector>>,
+    range_complete: bool,
+    timeout: bool,
+    timer: Pin<Box<dyn Future<Output = ()> + Send>>,
+    done_input: bool,
 }
 
 impl Collect {
-    pub fn new<INP>(inp: INP, deadline: Instant) -> Self
+    pub fn new<INP>(
+        inp: INP,
+        deadline: Instant,
+        events_max: u64,
+        range: Option<SeriesRange>,
+        binrange: Option<BinnedRangeEnum>,
+    ) -> Self
     where
         INP: CollectableStreamTrait + 'static,
     {
+        let timer = tokio::time::sleep_until(deadline.into());
         Self {
             inp: CollectableStreamBox(Box::pin(inp)),
             deadline,
+            events_max,
+            range,
+            binrange,
+            collector: None,
+            range_complete: false,
+            timeout: false,
+            timer: Box::pin(timer),
+            done_input: false,
+        }
+    }
+
+    fn handle_item(&mut self, item: Sitemty<Box<dyn Collectable>>) -> Result<(), Error> {
+        match item {
+            Ok(item) => match item {
+                StreamItem::DataItem(item) => match item {
+                    RangeCompletableItem::RangeComplete => {
+                        self.range_complete = true;
+                        if let Some(coll) = self.collector.as_mut() {
+                            coll.set_range_complete();
+                        } else {
+                            warn!("collect received RangeComplete but no collector yet");
+                        }
+                        Ok(())
+                    }
+                    RangeCompletableItem::Data(mut item) => {
+                        info!("collect sees len {}", item.len());
+                        let coll = self.collector.get_or_insert_with(|| item.new_collector());
+                        coll.ingest(&mut item);
+                        if coll.len() as u64 >= self.events_max {
+                            warn!(
+                                "TODO  compute continue-at  reached events_max {} abort",
+                                self.events_max
+                            );
+                        }
+                        Ok(())
+                    }
+                },
+                StreamItem::Log(item) => {
+                    trace!("collect log {:?}", item);
+                    Ok(())
+                }
+                StreamItem::Stats(item) => {
+                    trace!("collect stats {:?}", item);
+                    match item {
+                        // TODO factor and simplify the stats collection:
+                        StatsItem::EventDataReadStats(_) => {}
+                        StatsItem::RangeFilterStats(_) => {}
+                        StatsItem::DiskStats(item) => match item {
+                            DiskStats::OpenStats(k) => {
+                                //total_duration += k.duration;
+                            }
+                            DiskStats::SeekStats(k) => {
+                                //total_duration += k.duration;
+                            }
+                            DiskStats::ReadStats(k) => {
+                                //total_duration += k.duration;
+                            }
+                            DiskStats::ReadExactStats(k) => {
+                                //total_duration += k.duration;
+                            }
+                        },
+                    }
+                    Ok(())
+                }
+            },
+            Err(e) => {
+                // TODO  Need to use some flags to get good enough error message for remote user.
+                Err(e)
+            }
         }
     }
 }
 
 impl Future for Collect {
-    type Output = Sitemty<Box<dyn Collected>>;
+    type Output = Result<Box<dyn Collected>, Error>;
 
-    fn poll(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
+    fn poll(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Self::Output> {
         use Poll::*;
         let span = tracing::span!(Level::INFO, "Collect");
         let _spg = span.enter();
-        todo!()
+        loop {
+            break if self.done_input {
+                if self.timeout {
+                    if let Some(coll) = self.collector.as_mut() {
+                        coll.set_timed_out();
+                    } else {
+                        warn!("collect timeout but no collector yet");
+                    }
+                }
+                // TODO use range_final and timeout in result.
+                match self.collector.take() {
+                    Some(mut coll) => match coll.result(self.range.clone(), self.binrange.clone()) {
+                        Ok(res) => {
+                            //info!("collect stats total duration: {:?}", total_duration);
+                            Ready(Ok(res))
+                        }
+                        Err(e) => Ready(Err(e)),
+                    },
+                    None => {
+                        let e = Error::with_msg_no_trace(format!("no result because no collector was created"));
+                        error!("{e}");
+                        Ready(Err(e))
+                    }
+                }
+            } else {
+                match self.timer.poll_unpin(cx) {
+                    Ready(()) => {
+                        self.timeout = true;
+                        self.done_input = true;
+                        continue;
+                    }
+                    Pending => match self.inp.0.poll_next_unpin(cx) {
+                        Ready(Some(item)) => match self.handle_item(item) {
+                            Ok(()) => {
+                                continue;
+                            }
+                            Err(e) => {
+                                error!("{e}");
+                                Ready(Err(e))
+                            }
+                        },
+                        Ready(None) => {
+                            self.done_input = true;
+                            continue;
+                        }
+                        Pending => Pending,
+                    },
+                }
+            };
+        }
     }
 }
 
@@ -80,7 +214,7 @@ async fn collect_in_span<T, S>(
 ) -> Result<Box<dyn Collected>, Error>
 where
     S: Stream<Item = Sitemty<T>> + Unpin,
-    T: Collectable + WithLen + fmt::Debug,
+    T: Collectable,
 {
     info!("collect  events_max {events_max}  deadline {deadline:?}");
     let mut collector: Option<Box<dyn Collector>> = None;