Nix: prometheus support

Author: TheArcaneBrony

nix/modules/default/default.nix

@@ -18,6 +18,7 @@ in
 {
   imports = [
     ./integration-nginx.nix
+    ./integration-prometheus.nix
     ./users.nix
     (import ./gw-sharding.nix self)
     (import ./pion-sfu.nix self)

nix/modules/default/integration-prometheus.nix

@@ -0,0 +1,47 @@
+{
+  config,
+  lib,
+  ...
+}:
+
+let
+  cfg = config.services.spacebarchat-server;
+in
+{
+  options.services.spacebarchat-server.prometheus = {
+    enable = lib.mkEnableOption "prometheus integration";
+  };
+
+  config = lib.mkIf (cfg.enable && cfg.prometheus.enable) {
+    services.prometheus.scrapeConfigs = [
+      {
+        job_name = "spacebar-api-${builtins.toString cfg.apiEndpoint.localPort}";
+        scrape_interval = "1s";
+        static_configs = [
+          { targets = [ "localhost:${builtins.toString cfg.apiEndpoint.localPort}" ]; }
+        ];
+      }
+      {
+        job_name = "spacebar-gateway-${builtins.toString cfg.gatewayEndpoint.localPort}";
+        scrape_interval = "1s";
+        static_configs = [
+          { targets = [ "localhost:${builtins.toString cfg.gatewayEndpoint.localPort}" ]; }
+        ];
+      }
+      {
+        job_name = "spacebar-cdn-${builtins.toString cfg.cdnEndpoint.localPort}";
+        scrape_interval = "1s";
+        static_configs = [
+          { targets = [ "localhost:${builtins.toString cfg.cdnEndpoint.localPort}" ]; }
+        ];
+      }
+    ]
+    ++ (lib.map (port: {
+      job_name = "spacebar-gateway-${builtins.toString port}";
+      scrape_interval = "1s";
+      static_configs = [
+        { targets = [ "localhost:${builtins.toString port}" ]; }
+      ];
+    }) cfg.extraGatewayPorts);
+  };
+}