Refactor to break out scheduler

crates/scheduler/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "scheduler"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+lib = { path = "../lib" }
+chrono = "0.4.42"
+tokio = { version = "1.47.1", features = ["rt", "rt-multi-thread"] }
+log = "0.4.28"
+env_logger = "0.11.8"

crates/scheduler/Dockerfile

@@ -0,0 +1,24 @@
+# =========
+#  Builder
+# =========
+FROM rust:bookworm AS builder
+WORKDIR /builder
+
+COPY crates/lib /lib
+COPY crates/scheduler/src ./src
+COPY crates/scheduler/Cargo.toml ./
+
+RUN apt-get update && apt-get install -y cmake
+RUN cargo build --release
+
+# =========
+#  Runtime
+# =========
+FROM debian:bookworm-slim AS runtime
+WORKDIR /scheduler
+RUN apt-get update && apt-get install -y openssl libpq-dev ca-certificates
+USER root
+
+COPY --from=builder /builder/target/release/scheduler /usr/local/bin/scheduler
+
+CMD ["scheduler"]

crates/scheduler/src/main.rs

@@ -0,0 +1,56 @@
+use chrono::{DateTime, Utc};
+use std::env;
+use std::time::{Duration, Instant};
+use env_logger::Builder;
+use log::LevelFilter;
+use tokio::time::interval;
+use lib::metars::Metar;
+use lib::state::AppState;
+
+#[tokio::main]
+pub async fn main() {
+    Builder::new()
+      .filter_level(LevelFilter::Info) // Set a default log level
+      .filter_module("scheduler", LevelFilter::Trace)
+      .filter_module("lib", LevelFilter::Trace)
+      .init();
+
+    let state = match AppState::new().await {
+        Ok(state) => state,
+        Err(err) => {
+            log::error!("Failed to create state: {}", err);
+            return;
+        }
+    };
+    let seconds = env::var("METAR_INTERVAL")
+      .unwrap_or("300".to_string())
+      .parse::<u64>()
+      .unwrap_or(300);
+
+    // Create an interval ticker
+    let mut interval = interval(Duration::from_secs(seconds));
+    let mut etag = None;
+
+    loop {
+        interval.tick().await;
+
+        // Record start times
+        let start_monotonic = Instant::now();
+        let start_utc: DateTime<Utc> = Utc::now();
+        log::debug!("METAR update started at {}", start_utc);
+
+        // Run the update
+        match Metar::update_metars(&state, etag.clone()).await {
+            Ok(new_etag) => etag = Some(new_etag),
+            Err(err) => log::error!("METAR update failed: {}", err),
+        }
+
+        let elapsed = start_monotonic.elapsed();
+        let next_utc = Utc::now() + chrono::Duration::from_std(Duration::from_secs(seconds)).unwrap();
+        log::info!(
+            "METAR update finished in {:.2?}; next run at {}",
+            elapsed,
+            next_utc
+        );
+    }
+}