WIP on simple disk serve

disk/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "disk"
+version = "0.0.1-a.0"
+authors = ["Dominik Werder <dominik.werder@gmail.com>"]
+edition = "2018"
+
+[dependencies]
+tokio = { version = "1.4.0", features = ["rt-multi-thread", "io-util", "net", "time", "sync", "fs"] }
+tracing = "0.1.25"
+serde_json = "1.0"
+async-channel = "1.6"
+bytes = "1.0.1"
+futures-core = "0.3.12"
+err = { path = "../err" }
+netpod = { path = "../netpod" }

disk/src/lib.rs

@@ -0,0 +1,45 @@
+use err::Error;
+use std::task::{Context, Poll};
+use std::pin::Pin;
+use tokio::io::AsyncRead;
+//use std::future::Future;
+//use futures_core::Stream;
+
+pub async fn read_test_1() -> Result<netpod::BodyStream, Error> {
+    let path = "/data/sf-databuffer/daq_swissfel/daq_swissfel_3/byTime/S10CB01-RIQM-DCP10:FOR-AMPLT/0000000000000018714/0000000012/0000000000086400000_00000_Data";
+    let fin = tokio::fs::OpenOptions::new()
+        .read(true)
+        .open(path)
+        .await?;
+    let stream = netpod::BodyStream {
+        inner: Box::new(FileReader { file: fin }),
+    };
+    Ok(stream)
+}
+
+struct FileReader {
+    file: tokio::fs::File,
+}
+
+impl futures_core::Stream for FileReader {
+    type Item = Result<bytes::Bytes, Error>;
+
+    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
+        let mut buf2 = bytes::BytesMut::with_capacity(13);
+        if buf2.as_mut().len() != 13 {
+            panic!("todo prepare slice");
+        }
+        let mut buf = tokio::io::ReadBuf::new(buf2.as_mut());
+        let g = Pin::new(&mut self.file).poll_read(cx, &mut buf);
+        match g {
+            Poll::Ready(Ok(_)) => {
+                Poll::Ready(Some(Ok(buf2.freeze())))
+            }
+            Poll::Ready(Err(e)) => {
+                Poll::Ready(Some(Err(Error::from(e))))
+            }
+            Poll::Pending => Poll::Pending
+        }
+    }
+
+}