feat(l1): periodically check if there is a newer release available (#5322)

**Motivation**
Periodically checking and informing the user if there is a newer version
of ethrex available
<!-- Why does this pull request exist? What are its goals? -->

**Description**
* Periodically query the latest relese of ethrex on GitHub and check
against current running version, inform the user via log if there is a
newer version available.
<!-- A clear and concise general description of the changes this PR
introduces -->

<!-- Link to issues: Resolves #111, Resolves #222 -->

---------

Co-authored-by: Tomás Grüner <47506558+MegaRedHand@users.noreply.github.com>

Author: fmoletta

cmd/ethrex/ethrex.rs

@@ -5,11 +5,14 @@ use ethrex::{
     utils::{NodeConfigFile, get_client_version, store_node_config_file},
 };
 use ethrex_p2p::{discv4::peer_table::PeerTable, types::NodeRecord};
+use serde::Deserialize;
 use std::{path::Path, time::Duration};
 use tokio::signal::unix::{SignalKind, signal};
 use tokio_util::sync::CancellationToken;
 use tracing::info;
 
+const LATEST_VERSION_URL: &str = "https://api.github.com/repos/lambdaclass/ethrex/releases/latest";
+
 #[cfg(all(feature = "jemalloc", not(target_env = "msvc")))]
 #[global_allocator]
 static ALLOC: tikv_jemallocator::Jemalloc = tikv_jemallocator::Jemalloc;
@@ -45,6 +48,80 @@ async fn server_shutdown(
     info!("Server shutting down!");
 }
 
+/// Fetches the latest release version on github
+/// Returns None if there was an error when requesting the latest version
+async fn latest_release_version() -> Option<String> {
+    #[derive(Deserialize)]
+    struct Release {
+        tag_name: String,
+    }
+    let client = reqwest::Client::new();
+    let response = client
+        .get(LATEST_VERSION_URL)
+        .header("User-Agent", "ethrex")
+        .send()
+        .await
+        .ok()?;
+    if !response.status().is_success() {
+        None
+    } else {
+        Some(
+            response
+                .json::<Release>()
+                .await
+                .ok()?
+                .tag_name
+                .trim_start_matches("v")
+                .to_string(),
+        )
+    }
+}
+
+/// Reads current crate version
+fn current_version() -> &'static str {
+    env!("CARGO_PKG_VERSION")
+}
+
+/// Returns true if the received latest version is higher than the current ethrex version
+fn is_higher_than_current(latest_version: &str) -> bool {
+    let current_version_numbers = current_version()
+        .split(".")
+        .map(|c| c.parse::<u64>().unwrap_or_default());
+    let latest_version_numbers = latest_version
+        .split(".")
+        .map(|c| c.parse::<u64>().unwrap_or_default());
+    for (current, latest) in current_version_numbers.zip(latest_version_numbers) {
+        match current.cmp(&latest) {
+            std::cmp::Ordering::Less => return true,
+            std::cmp::Ordering::Equal => {}
+            std::cmp::Ordering::Greater => return false,
+        };
+    }
+    false
+}
+
+/// Checks if the latest released version is higher than the current version and emits an info log
+/// Won't emit a log line if the current version is newer or equal, or if there was a problem reading either version
+async fn check_version_update() {
+    if let Some(latest_version) = latest_release_version().await
+        && is_higher_than_current(&latest_version)
+    {
+        info!(
+            "There is a newer ethrex version available, current version: {} vs latest version: {latest_version}",
+            current_version()
+        );
+    }
+}
+
+/// Checks if there is a newer ethrex verison available every hour
+async fn periodically_check_version_update() {
+    let mut interval = tokio::time::interval(Duration::from_secs(60 * 60));
+    loop {
+        interval.tick().await;
+        check_version_update().await;
+    }
+}
+
 #[tokio::main]
 async fn main() -> eyre::Result<()> {
     let CLI { opts, command } = CLI::parse();
@@ -61,6 +138,7 @@ async fn main() -> eyre::Result<()> {
     let log_filter_handler = init_tracing(&opts);
 
     info!("ethrex version: {}", get_client_version());
+    tokio::spawn(periodically_check_version_update());
 
     let (datadir, cancel_token, peer_table, local_node_record) =
         init_l1(opts, Some(log_filter_handler)).await?;