107 lines
4.2 KiB
Rust
107 lines
4.2 KiB
Rust
use crate::agg::MinMaxAvgScalarBinBatch;
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use crate::cache::{node_ix_for_patch, HttpBodyAsAsyncRead};
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use crate::frame::inmem::InMemoryFrameAsyncReadStream;
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use crate::frame::makeframe::FrameType;
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use err::Error;
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use futures_core::Stream;
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use futures_util::{pin_mut, FutureExt};
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#[allow(unused_imports)]
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use netpod::log::*;
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use netpod::{AggKind, Channel, NodeConfig, PreBinnedPatchCoord};
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use std::pin::Pin;
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use std::sync::Arc;
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use std::task::{Context, Poll};
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pub struct PreBinnedValueFetchedStream {
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uri: http::Uri,
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resfut: Option<hyper::client::ResponseFuture>,
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res: Option<InMemoryFrameAsyncReadStream<HttpBodyAsAsyncRead>>,
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}
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impl PreBinnedValueFetchedStream {
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pub fn new(
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patch_coord: PreBinnedPatchCoord,
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channel: Channel,
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agg_kind: AggKind,
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node_config: Arc<NodeConfig>,
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) -> Self {
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let nodeix = node_ix_for_patch(&patch_coord, &channel, &node_config.cluster);
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let node = &node_config.cluster.nodes[nodeix as usize];
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warn!("TODO defining property of a PreBinnedPatchCoord? patchlen + ix? binsize + patchix? binsize + patchsize + patchix?");
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// TODO encapsulate uri creation, how to express aggregation kind?
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let uri: hyper::Uri = format!(
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"http://{}:{}/api/1/prebinned?{}&channel_backend={}&channel_name={}&agg_kind={:?}",
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node.host,
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node.port,
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patch_coord.to_url_params_strings(),
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channel.backend,
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channel.name,
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agg_kind,
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)
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.parse()
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.unwrap();
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info!("PreBinnedValueFetchedStream open uri {}", uri);
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Self {
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uri,
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resfut: None,
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res: None,
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}
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}
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}
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// TODO use a newtype here to use a different FRAME_TYPE_ID compared to
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// impl FrameType for BinnedBytesForHttpStreamFrame
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pub type PreBinnedHttpFrame = Result<MinMaxAvgScalarBinBatch, Error>;
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impl Stream for PreBinnedValueFetchedStream {
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// TODO need this generic for scalar and array (when wave is not binned down to a single scalar point)
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type Item = PreBinnedHttpFrame;
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fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<Self::Item>> {
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use Poll::*;
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'outer: loop {
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break if let Some(res) = self.res.as_mut() {
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pin_mut!(res);
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match res.poll_next(cx) {
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Ready(Some(Ok(frame))) => {
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assert!(frame.tyid() == <PreBinnedHttpFrame as FrameType>::FRAME_TYPE_ID);
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match bincode::deserialize::<PreBinnedHttpFrame>(frame.buf()) {
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Ok(item) => Ready(Some(item)),
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Err(e) => Ready(Some(Err(e.into()))),
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}
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}
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Ready(Some(Err(e))) => Ready(Some(Err(e.into()))),
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Ready(None) => Ready(None),
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Pending => Pending,
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}
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} else if let Some(resfut) = self.resfut.as_mut() {
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match resfut.poll_unpin(cx) {
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Ready(res) => match res {
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Ok(res) => {
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info!("PreBinnedValueFetchedStream GOT result from SUB REQUEST: {:?}", res);
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let s1 = HttpBodyAsAsyncRead::new(res);
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let s2 = InMemoryFrameAsyncReadStream::new(s1);
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self.res = Some(s2);
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continue 'outer;
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}
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Err(e) => {
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error!("PreBinnedValueStream error in stream {:?}", e);
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Ready(Some(Err(e.into())))
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}
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},
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Pending => Pending,
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}
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} else {
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let req = hyper::Request::builder()
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.method(http::Method::GET)
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.uri(&self.uri)
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.body(hyper::Body::empty())?;
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let client = hyper::Client::new();
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info!("PreBinnedValueFetchedStream START REQUEST FOR {:?}", req);
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self.resfut = Some(client.request(req));
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continue 'outer;
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};
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}
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}
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}
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