add draft triples nixos module

Author: robx

flake.nix

@@ -60,5 +60,8 @@
             ];
           };
         });
+      nixosModules = {
+        triples = import ./triples.nix;
+      };
     };
 }

triples.nix

@@ -0,0 +1,58 @@
+{
+  config,
+  lib,
+  pkgs,
+  modulesPath,
+  ...
+}:
+with lib; let
+  cfg = config.services.triples;
+in {
+  options.services.triples = {
+    enable = mkEnableOption "triples server";
+
+    nginx = mkOption {
+      type = types.submodule (import "${modulesPath}/services/web-servers/nginx/vhost-options.nix" {inherit config lib;});
+      default = {};
+      description = "Extra configuration for the nginx virtual host of triples.";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.services.triples = {
+      description = "Run triples backend";
+      wantedBy = ["multi-user.target"];
+      after = ["networking.target"];
+      serviceConfig = {
+        ExecStart = "${pkgs.triples-serve}/bin/serve -bot=false -static=${pkgs.triples-static}/";
+        Restart = "always";
+      };
+    };
+    services.nginx = {
+      enable = true;
+      upstreams.triples-backend.servers."localhost:8080" = {};
+      virtualHosts."localhost" = mkMerge [
+        cfg.nginx
+        {
+          #          default = true;
+          # root = mkForce "${cfg.package}/share/fluidd/htdocs";
+          locations = {
+            "/api/join" = {
+              proxyWebsockets = true;
+              proxyPass = "http://triples-backend/api/join";
+              extraConfig = ''
+                # go websocket origin check
+                # ($http_host instead of $host because the latter strips
+                # port number, relevant for local vm test)
+                proxy_set_header Host $http_host;
+              '';
+            };
+            "/" = {
+              proxyPass = "http://triples-backend/";
+            };
+          };
+        }
+      ];
+    };
+  };
+}