From c726b7e2065e3a9dce7c4c0c574bea6586d46638 Mon Sep 17 00:00:00 2001
From: Alec Murphy <alec@checksum.fail>
Date: Wed, 12 Mar 2025 08:23:41 -0400
Subject: [PATCH] Slon/Http/AdminServer: Display free memory in /info/stats

---
 Slon/Http/AdminServer.HC         | 6 +++++-
 Slon/Static/html/admin/main.html | 2 +-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/Slon/Http/AdminServer.HC b/Slon/Http/AdminServer.HC
index 6a41ee6..e205778 100644
--- a/Slon/Http/AdminServer.HC
+++ b/Slon/Http/AdminServer.HC
@@ -290,8 +290,12 @@ U0 @slon_admin_info_stats(SlonHttpSession* session)
     SLON_SCRATCH_BUFFER_AND_REQUEST_JSON
     no_warn request_json;
 
+    I64 free_memory = sys_code_bp->alloced_u8s - sys_code_bp->used_u8s;
+    if (sys_data_bp) {
+        free_memory += sys_data_bp->alloced_u8s - sys_data_bp->used_u8s;
+    }
     StrPrint(scratch_buffer, "{");
-    String.Append(scratch_buffer, "\"uptime\":\"%d\"", cnts.jiffies);
+    String.Append(scratch_buffer, "\"uptime\":%d,\"free_memory\":%d", cnts.jiffies, free_memory);
     String.Append(scratch_buffer, "}");
 
     session->content_type("application/json");
diff --git a/Slon/Static/html/admin/main.html b/Slon/Static/html/admin/main.html
index c927284..e469bea 100644
--- a/Slon/Static/html/admin/main.html
+++ b/Slon/Static/html/admin/main.html
@@ -61,7 +61,7 @@
             const request = new Request("/info/stats");
             const response = await fetch(request);
             const stats = await response.json();
-            let html = "<h4 class=\"title is-4\">Statistics</h4><div class=spacer></div><div>Uptime: " + formatTime(stats["uptime"]) + "</div>";
+            let html = "<h4 class=\"title is-4\">Statistics</h4><div class=spacer></div><div>Uptime: " + formatTime(stats["uptime"]) + "<br/>Free memory: " + stats["free_memory"].toString() + " bytes<br/></div>";
             setContent(html);
             setActiveLink("stats");
         }