Dynamically resolve runelite api version rather than hardcoding it

src/collectors/mod.rs

@@ -1,9 +1,31 @@
 pub mod player_count;
 pub mod stats;
 
+use serde::Deserialize;
+
 pub trait PromMetric {
     fn to_metric_string(self: &Self) -> String;
 }
 
 pub const USER_AGENT: &str = "osrs-prometheus-exporter";
-pub const RUNELITE_API_VERSION: &str = "runelite-1.9.13";
+
+#[derive(Deserialize)]
+struct GithubTag {
+    name: String,
+}
+
+async fn get_runelite_version() -> eyre::Result<String> {
+    let resp = reqwest::Client::new()
+        .get("https://api.github.com/repos/runelite/runelite/tags")
+        .header("User-Agent", USER_AGENT)
+        .send()
+        .await?
+        .json::<Vec<GithubTag>>()
+        .await?;
+
+    if let Some(latest) = resp.first() {
+        Ok(latest.name.replace("parent-", ""))
+    } else {
+        Err(eyre::eyre!("Failed to get github tags for runelite version"))
+    }
+}

src/collectors/player_count.rs

@@ -122,7 +122,8 @@ impl World {
 }
 
 pub async fn get_player_count() -> eyre::Result<Vec<World>> {
-    let req_url = format!("https://api.runelite.net/{}/worlds.js", super::RUNELITE_API_VERSION);
+    let runelite_version = super::get_runelite_version().await?;
+    let req_url = format!("https://api.runelite.net/{}/worlds.js", runelite_version);
     let resp = reqwest::Client::new()
         .get(req_url)
         .header("User-Agent", super::USER_AGENT)