From 6ef35ded69891d2ca1dc9535dfc29afdae1e3770 Mon Sep 17 00:00:00 2001
From: Graham Christensen <graham@grahamc.com>
Date: Fri, 23 Jun 2023 08:52:19 -0400
Subject: [PATCH] Accept diagnostics as an argument, even though it doesn't do
 anything

---
 magic-nix-cache/src/main.rs | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/magic-nix-cache/src/main.rs b/magic-nix-cache/src/main.rs
index eeca136..9b215fa 100644
--- a/magic-nix-cache/src/main.rs
+++ b/magic-nix-cache/src/main.rs
@@ -68,6 +68,16 @@ struct Args {
     #[arg(long)]
     upstream: Option<String>,
 
+    /// Diagnostic endpoint to send diagnostics and performance data.
+    ///
+    /// Set it to an empty string to disable reporting.
+    /// See the README for details.
+    #[arg(
+        long,
+        default_value = "https://install.determinate.systems/nix-actions-cache/perf"
+    )]
+    diagnostic_endpoint: String,
+
     /// Daemonize the server.
     ///
     /// This is for use in the GitHub Action only.
@@ -115,6 +125,15 @@ fn main() {
             .expect("Failed to load credentials from environment (see README.md)")
     };
 
+    match args.diagnostic_endpoint.as_str() {
+        "" => {
+            tracing::info!("Diagnostics disabled.");
+        }
+        url => {
+            tracing::info!("Diagnostics would report to {url}, but is currently unimplemented.");
+        }
+    }
+
     let mut api = Api::new(credentials).expect("Failed to initialize GitHub Actions Cache API");
 
     if let Some(cache_version) = &args.cache_version {