From 8c666c3f781156e9321439ea279ddf83323bcd06 Mon Sep 17 00:00:00 2001
From: Joe Ardent <code@ardent.nebcorp.com>
Date: Wed, 31 May 2023 12:43:57 -0700
Subject: [PATCH] only update last_seen every 12 hours

---
 src/users.rs | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/users.rs b/src/users.rs
index e54f04b..26f2dfd 100644
--- a/src/users.rs
+++ b/src/users.rs
@@ -1,4 +1,7 @@
-use std::fmt::Display;
+use std::{
+    fmt::Display,
+    time::{SystemTime, UNIX_EPOCH},
+};
 
 use axum::{extract::State, http::Request, middleware::Next, response::IntoResponse};
 use axum_login::{secrecy::SecretVec, AuthUser};
@@ -78,7 +81,18 @@ pub async fn handle_update_last_seen<BodyT>(
     next: Next<BodyT>,
 ) -> impl IntoResponse {
     if let Some(user) = auth.current_user {
-        user.update_last_seen(&pool).await;
+        if let Some(then) = user.last_seen {
+            let now = SystemTime::now()
+                .duration_since(UNIX_EPOCH)
+                .unwrap_or_default()
+                .as_secs() as i64;
+            // The Nyquist frequency for 1-day tracking resolution is 12 hours.
+            if now - then > 12 * 3600 {
+                user.update_last_seen(&pool).await;
+            }
+        } else {
+            user.update_last_seen(&pool).await;
+        }
     }
     next.run(request).await
 }