feat: prometheus + grafana

overlays/mods/n8n.nix

@@ -1,26 +1,40 @@
-# {prev}:
-# prev.n8n.overrideAttrs (oldAttrs: rec {
-#   version = "1.112.6";
+# Adds `libphonenumber-js` to n8n's node_modules so it can be require()'d
+# from Code nodes running in the Task Runner.
+#
+# Prerequisite on the n8n service:
+#   N8N_RUNNERS_EXTERNAL_ALLOW = "libphonenumber-js";
+#
+# libphonenumber-js has zero runtime + peer dependencies, so a plain tarball
+# unpack into the shared node_modules hierarchy is sufficient.
+{prev}: let
+  libphonenumber-js = prev.stdenv.mkDerivation rec {
+    pname = "libphonenumber-js";
+    version = "1.13.8";
 
-#   src = prev.fetchFromGitHub {
-#     owner = "n8n-io";
-#     repo = "n8n";
-#     rev = "n8n@${version}";
-#     hash = "sha256-r/MCU/S1kkKQPkhmp9ZHTtgZxMu5TFCl5Yejp73gATw=";
-#   };
+    src = prev.fetchurl {
+      url = "https://registry.npmjs.org/${pname}/-/${pname}-${version}.tgz";
+      hash = "sha256-SysWDKlbXgbe441Sd4pO+k+F1y/UC49a1KL+DcFWBIA=";
+    };
 
-#   pnpmDeps = prev.pnpm_10.fetchDeps {
-#     pname = oldAttrs.pname;
-#     inherit version src;
-#     fetcherVersion = 1;
-#     hash = "sha256-j+HJhvzrcu8JsezcFJxfgteOgTspWQb2ZSN2fEl7Voo=";
-#   };
+    dontConfigure = true;
+    dontBuild = true;
 
-#   nativeBuildInputs =
-#     builtins.map
-#     (input:
-#       if input == prev.pnpm_9.configHook
-#       then prev.pnpm_10.configHook
-#       else input)
-#     oldAttrs.nativeBuildInputs;
-# })
+    installPhase = ''
+      runHook preInstall
+      mkdir -p $out/lib/node_modules/${pname}
+      cp -r * $out/lib/node_modules/${pname}/
+      runHook postInstall
+    '';
+  };
+in
+  prev.n8n.overrideAttrs (oldAttrs: {
+    postInstall =
+      (oldAttrs.postInstall or "")
+      + ''
+        # n8n ships a pnpm stub symlink (libphonenumber-js -> empty-npm-package).
+        # Remove it and place the real package there instead.
+        rm -rf $out/lib/n8n/node_modules/libphonenumber-js
+        cp -r ${libphonenumber-js}/lib/node_modules/libphonenumber-js \
+          $out/lib/n8n/node_modules/
+      '';
+  })