nix: nixos module for backend installation
systemd to run service, nginx config bundled in
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efim
parent
81f466ceb0
commit
24b42352b3
110
flake.nix
110
flake.nix
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@ -1,18 +1,35 @@
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{
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description = "Planning Poker web app. Trying to build something and learn new things";
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description =
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"Planning Poker web app. Trying to build something and learn new things";
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inputs.nixpkgs.url = "github:nixos/nixpkgs";
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inputs.flake-utils.url = "github:numtide/flake-utils";
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inputs.sbt-derivation.url = "github:zaninime/sbt-derivation/master";
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inputs.sbt-derivation.inputs.nixpkgs.follows = "nixpkgs";
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outputs = { self, nixpkgs, flake-utils, sbt-derivation }:
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flake-utils.lib.eachDefaultSystem
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(system:
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flake-utils.lib.eachDefaultSystem (system:
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let
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pkgs = nixpkgs.legacyPackages.${system};
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packageName = "blanning-poker-kazbegi";
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backendName = "${packageName}-backend";
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version = "0.1.1";
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backendPackage = sbt-derivation.lib.mkSbtDerivation rec {
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inherit pkgs version;
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# ...and the rest of the arguments
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pname = "${backendName}";
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depsSha256 = "sha256-7MNlMeljYqXY4/kK4BXoycp9xUz0tGwCQvPTlE1RIQU=";
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src = pkgs.nix-gitignore.gitignoreSource [ ] ./.;
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buildPhase = ''
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sbt backend/assembly
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'';
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installPhase = ''
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mkdir -p $out/bin
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cp backend/target/scala-*/backend-assembly-*.jar $out/bin/${pname}.jar
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'';
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};
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in {
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# Development shell with things required for local dev
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devShells.default = pkgs.mkShell {
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buildInputs = [
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pkgs.nodejs
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@ -26,22 +43,81 @@
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echo "dev env for planning poker BWARGH started"
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'';
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};
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packages.backend = sbt-derivation.lib.mkSbtDerivation rec {
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inherit pkgs version;
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# Just the backend jar
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packages.backend = backendPackage;
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# Module for NixOS to allow starting backend as SystemD service
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nixosModules.backendApp = { config, pkgs, ... }:
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let
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cfg = config.services.${backendName};
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lib = pkgs.lib;
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in {
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options.services.${backendName} = {
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enable =
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lib.mkEnableOption "My frontendmentor exercise ${backendName}";
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# ...and the rest of the arguments
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pname = "${packageName}-backend";
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depsSha256 = "sha256-7MNlMeljYqXY4/kK4BXoycp9xUz0tGwCQvPTlE1RIQU=";
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src = pkgs.nix-gitignore.gitignoreSource [] ./.;
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buildPhase = ''
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sbt backend/assembly
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'';
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installPhase = ''
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mkdir -p $out/bin
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cp backend/target/scala-*/backend-assembly-*.jar $out/bin/
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port = lib.mkOption {
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type = lib.types.int;
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default = 8080;
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description = "Port to listen on.";
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};
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host = lib.mkOption {
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type = lib.types.str;
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default = "localhost";
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description = "Host to bind to.";
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};
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useNginx = lib.mkOption {
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type = lib.types.bool;
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default = true;
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description = "Whether to use Nginx to proxy requests.";
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};
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};
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config = lib.mkIf cfg.enable {
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users.groups."${backendName}-group" = { };
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users.users."${backendName}-user" = {
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isSystemUser = true;
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group = "${backendName}-group";
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};
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systemd.services.${backendName} =
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let serverHost = if cfg.useNginx then "localhost" else cfg.host;
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in {
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description = "Exercise app ${backendName}";
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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startLimitIntervalSec = 30;
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startLimitBurst = 10;
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serviceConfig = {
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ExecStart =
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"${pkgs.jdk}/bin/java -jar ${backendPackage}/bin/${backendName}.jar -p ${
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toString cfg.port
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} --host ${serverHost}";
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WorkingDirectory = "${backendPackage}/bin";
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Restart = "on-failure";
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User = "${backendName}-user";
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Group = "${backendName}-group";
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};
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};
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# this is only backend. Front end still configured and installed separately.
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services.nginx.virtualHosts.${cfg.host}.locations."/api" = {
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proxyPass = "http://127.0.0.1:${toString cfg.port}";
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# this is config for websocket
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extraConfig = ''
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rewrite ^/api/(.*)$ /$1 break;
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proxy_set_header Host $host;
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proxy_set_header X-Real-IP $remote_addr;
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proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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proxy_set_header X-Forwarded-Proto $scheme;
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# Add the following lines for WebSocket support
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proxy_http_version 1.1;
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proxy_set_header Upgrade $http_upgrade;
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proxy_set_header Connection "upgrade";
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'';
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};
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}
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);
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};
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};
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});
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# see https://serokell.io/blog/practical-nix-flakes
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}
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