From d48997cfb443512cff63a3f9aff31a96ced3e961 Mon Sep 17 00:00:00 2001
From: Daniel Olsen <daniel.olsen99@gmail.com>
Date: Wed, 13 Mar 2024 06:22:24 +0100
Subject: [PATCH] generate only one upstream per worker

---
 lib.nix                          |  1 +
 tests/nginx-pipeline/default.nix | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/lib.nix b/lib.nix
index b9b04af..24a769d 100644
--- a/lib.nix
+++ b/lib.nix
@@ -29,6 +29,7 @@ rec {
       # Subindex by resource names, listener types, and convert to upstreams
       (lib.mapAttrs (_: workers: lib.pipe workers [
         (lib.concatMap (worker: worker.settings.worker_listeners))
+        lib.lists.head # only select one listener for the worker to avoid cache thrashing
         lib.flatten
         mapListenersToUpstreamsByType
       ]))
diff --git a/tests/nginx-pipeline/default.nix b/tests/nginx-pipeline/default.nix
index 87d84a8..03958cc 100644
--- a/tests/nginx-pipeline/default.nix
+++ b/tests/nginx-pipeline/default.nix
@@ -20,6 +20,20 @@ let
             normalSyncers = 1;
             eventPersisters = 1;
             useUserDirectoryWorker = true;
+
+            instances.auto-fed-receiver1.settings.worker_listeners = [
+              {
+                bind_addresses = [
+                  "127.0.0.2"
+                ];
+                port = 1337;
+                resources = [
+                  { compress = false;
+                    names = [ "federation" ];
+                  }
+                ];
+              }
+            ];
           };
 
           settings.server_name = "example.com";