Move throttling outside of tiles

src/config.rs

@@ -89,8 +89,8 @@ pub fn process_tile(
 ) -> BoxStream<'static, Result<Block, Box<dyn std::error::Error + Send + Sync>>> {
     let five_secs = time::Duration::from_secs(5);
     match tile {
-        TileConfig::Load => Box::pin(tiles::load_stream(time::interval(five_secs))),
-        TileConfig::Memory => Box::pin(tiles::memory_stream(time::interval(five_secs))),
+        TileConfig::Load => Box::pin(time::throttle(five_secs, tiles::load_stream())),
+        TileConfig::Memory => Box::pin(time::throttle(five_secs, tiles::memory_stream())),
         TileConfig::Hostname => Box::pin(tiles::hostname_stream()),
         TileConfig::Time(c) => Box::pin(tiles::time_stream(c.clone())),
     }

src/tiles/load.rs

@@ -4,13 +4,9 @@ use tokio::fs::File;
 use tokio::prelude::*;
 use tokio::stream::Stream;
 
-pub fn load_stream<T>(
-    clock: T,
-) -> impl Stream<Item = Result<Block, Box<dyn std::error::Error + Send + Sync>>>
-where
-    T: Stream,
+pub fn load_stream() -> impl Stream<Item = Result<Block, Box<dyn std::error::Error + Send + Sync>>>
 {
-    clock.then(|_| async {
+    futures::stream::repeat(()).then(|()| async {
         let mut raw = String::new();
         File::open("/proc/loadavg")
             .await?

src/tiles/memory.rs

@@ -1,7 +1,6 @@
 use crate::tile::Block;
-use futures::{Stream, StreamExt};
-use std::io;
-use std::str;
+use futures::{stream, Stream, StreamExt};
+use std::{io, str, u64};
 use tokio::fs::File;
 use tokio::prelude::*;
 
@@ -41,13 +40,9 @@ fn extract_value(line: &str) -> Result<u64, Box<dyn std::error::Error + Send + S
         .parse()?)
 }
 
-pub fn memory_stream<T>(
-    clock: T,
-) -> impl Stream<Item = Result<Block, Box<dyn std::error::Error + Send + Sync>>>
-where
-    T: Stream,
+pub fn memory_stream() -> impl Stream<Item = Result<Block, Box<dyn std::error::Error + Send + Sync>>>
 {
-    clock.then(|_| async {
+    stream::repeat(()).then(|_| async {
         let mut raw = [0u8; 256];
         File::open("/proc/meminfo")
             .await?

src/tiles/time.rs

@@ -49,7 +49,7 @@ impl Stream for TimeStream {
     type Item = Result<Block, Box<dyn Error + Send + Sync>>;
     fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
         let project = Pin::as_mut(&mut self).project();
-        let () = ready!(Future::poll(project.delay, cx));
+        ready!(Future::poll(project.delay, cx));
 
         let now = Local::now();
         Pin::as_mut(&mut self)