From 4ad2010194037ad25c54631995e89b9d9ee878b3 Mon Sep 17 00:00:00 2001
From: stuebinm
Date: Mon, 23 Aug 2021 15:18:17 +0200
Subject: init exneuland as alternative backend

It appears to work (somewhat). Limitations:
 - exneuland is not configurable; can only have it once
 - frontend untested since last update broke things
---
 TODO                 |  3 ++-
 default.nix          | 28 +++++++++++++++++++++++-----
 exneuland.nix        | 23 +++++++++++++++++++++++
 instance-options.nix | 11 +++++++++++
 nix/sources.json     | 30 ++++++++++++++++++++++++++++++
 5 files changed, 89 insertions(+), 6 deletions(-)
 create mode 100644 exneuland.nix

diff --git a/TODO b/TODO
index 52cdd5b..0318b27 100644
--- a/TODO
+++ b/TODO
@@ -1,2 +1,3 @@
  - periodically update the tcm version until they declare a stable version
- - add option to use exneuland as backend
+ - rework the entire ./default.nix, it's confusing
+ - figure out what they did to the frontend
diff --git a/default.nix b/default.nix
index 8e631bd..9002aec 100644
--- a/default.nix
+++ b/default.nix
@@ -27,7 +27,23 @@ let
     SOCKET_IDLE_TIME = toString commonConfig.socketIdleTime;
   };
 
-  servicesBack = mapAttrs' (instanceName: instanceConfig: {
+  servicesBack = mapAttrs' (instanceName: instanceConfig:
+    if instanceConfig.exneuland.enable then {
+      name = "wa-exneuland-${instanceName}";
+      value = {
+        description = "Exneuland backend for ${instanceName}";
+        wantedBy = [ "multi-user.target" ];
+        after = [ "network.target" ];
+        serviceConfig = {
+          ExecStart =
+            "${instanceConfig.exneuland.package}/bin/exneuland start";
+          Restart = "always";
+          DynamicUser = true;
+          User = "exneuland-backend";
+          Group = "exneuland-backend";
+        };
+      };
+    } else {
       name = "wa-back-${instanceName}";
       value = mkIf instanceConfig.backend.enable {
         description = "WorkAdventure backend ${instanceName}";
@@ -66,9 +82,9 @@ let
   ) instances;
 
   servicesPusher = mapAttrs' (instanceName: instanceConfig:
-    {
+   {
       name = "wa-pusher-${instanceName}";
-      value = mkIf instanceConfig.pusher.enable {
+      value = mkIf (instanceConfig.pusher.enable && !instanceConfig.exneuland.enable) {
         description = "WorkAdventure pusher ${instanceName}";
         wantedBy = [ "multi-user.target" ];
         after = [ "network.target" ];
@@ -132,8 +148,10 @@ let
         };
 
         "/pusher/" = {
-          #proxyPass = "http://10.233.3.1:9000";
-          proxyPass = "http://localhost:${toString instanceConfig.pusher.port}/";
+          proxyPass =
+            if instanceConfig.exneuland.enable
+            then "http://localhost:4000"
+            else "http://localhost:${toString instanceConfig.pusher.port}/";
           proxyWebsockets = true;
         };
 
diff --git a/exneuland.nix b/exneuland.nix
new file mode 100644
index 0000000..1e9b2b1
--- /dev/null
+++ b/exneuland.nix
@@ -0,0 +1,23 @@
+{ pkgs ? import (import ./nix/sources.nix {}).nixpkgs {}
+, unstable-pkgs ? import (import ./nix/sources.nix {}).nixpkgs-unstable {}
+, exneuland-src ? (import ./nix/sources.nix {}).exneuland
+, ...}:
+
+let
+  packages = pkgs.beam.packagesWith pkgs.beam.interpreters.erlang;
+
+in (packages.mixRelease.override {elixir = unstable-pkgs.elixir_1_12; }) rec {
+  pname = "exneuland";
+  version = "0.0.1";
+  src = exneuland-src;
+
+  mixEnv = "prod";
+
+  mixDeps = packages.fetchMixDeps {
+    pname = "mix-deps-${pname}";
+    inherit src mixEnv version;
+    sha256 = "0nyips2ky6rmgq3xdhrhg4fnw4m2pmck6p1amw9m7qisdqlxhv25";
+  };
+
+  buildInputs = with pkgs; [ rebar3 protobuf ];
+}
diff --git a/instance-options.nix b/instance-options.nix
index 17e398d..f2c5ce9 100644
--- a/instance-options.nix
+++ b/instance-options.nix
@@ -13,6 +13,17 @@ with pkgs;
       description = "The package set to use. It should contain a front, backend, pusher, and maps package.";
     };
 
+    exneuland = {
+      enable = mkOption {
+        default = true;
+        type = types.bool;
+      };
+      package = mkOption {
+        default = import ./exneuland.nix {};
+        type = types.package;
+      };
+    };
+
     backend = {
       enable = mkOption {
         default = true;
diff --git a/nix/sources.json b/nix/sources.json
index f653057..08a668e 100644
--- a/nix/sources.json
+++ b/nix/sources.json
@@ -1,4 +1,34 @@
 {
+    "exneuland": {
+        "branch": "main",
+        "repo": "https://gitlab.com/hexchen/exneuland",
+        "rev": "5f7640942a332e722a782c29d852eeeb262dd8b8",
+        "type": "git"
+    },
+    "nixpkgs": {
+        "branch": "release-21.05",
+        "description": "Nix Packages collection",
+        "homepage": "",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "dcb27f623fe9b2bb1275029af3148ca7156ede2d",
+        "sha256": "08sdvg2qr801a0v465zyrrbi028b3dm2adb320v7an4878z05nkl",
+        "type": "tarball",
+        "url": "https://github.com/nixos/nixpkgs/archive/dcb27f623fe9b2bb1275029af3148ca7156ede2d.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
+    "nixpkgs-unstable": {
+        "branch": "nixpkgs-unstable",
+        "description": "Nix Packages collection",
+        "homepage": "",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "14b0f20fa1f56438b74100513c9b1f7c072cf789",
+        "sha256": "0lzirqazbpx5jda2sppa3ylkn1ywcq1z8v9510pxdpmkp969d1ck",
+        "type": "tarball",
+        "url": "https://github.com/nixos/nixpkgs/archive/14b0f20fa1f56438b74100513c9b1f7c072cf789.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
     "tcm": {
         "branch": "develop",
         "description": "A collaborative web application (virtual office) presented as a 16-bit RPG video game",
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