main: Add a randomized delay before fetching feeds

Cargo.lock

@@ -1301,6 +1301,7 @@ dependencies = [
  "chrono",
  "feed-rs",
  "matrix-sdk",
+ "rand",
  "reqwest",
  "serde",
  "serde_yaml",

Cargo.toml

@@ -6,6 +6,7 @@ license = "GPL-3.0-or-later"
 authors = ["mirsal <mirsal@mirsal.fr>"]
 
 [dependencies]
+rand = "0.8"
 serde = "1.0"
 anyhow = "1.0"
 chrono = "0.4"

src/main.rs

@@ -63,6 +63,11 @@ async fn main() -> anyhow::Result<()> {
         tokio::spawn(async move {
 
             loop {
+                let delay = rand::random::<u64>() % (feed_config.delay / 5);
+
+                debug!("Adding randomized delay: {}", delay);
+                sleep(Duration::from_secs(delay)).await;
+
                 let feed: Option<_> = match fetch_and_parse_feed(&feed_config.url).await {
                     Ok(f) => Some(f),
                     Err(e) => {