init: vspd at 1.4.0

README.md

@@ -19,6 +19,13 @@ If you want to use this today, the sane way would be to fork the project, review
 
 The git server for this project runs on a shared virtual server, so don't trust unsigned or unverified messages.
 
+Service Module Notes
+---
+- [bisonw](docs/bisonw.md)
+- [dcrd](docs/dcrd.md)
+- [dcrwallet](docs/dcrwallet.md)
+- [vspd](docs/vspd.md)
+
 Support
 ---
 No support is provided. If you have ideas for improvement, general feedback, or a PR, you can tag @stakeynet on the Decred matrix channels.

docs/vspd.md

@@ -0,0 +1,67 @@
+# vspd options
+
+`vspd` uses rpc credentials, so it's recommended to secure your secrets using a tool like [sops-nix](https://github.com/Mic92/sops-nix).
+
+## sops-nix
+
+Render `vspd.conf` with `sops-nix` and point the service at it. Example:
+
+```nix
+{ config, lib, pkgs, ... }:
+{
+  # Define credentials as secrets
+  sops.secrets."vspd/adminpass" = {};
+  sops.secrets."dcrd/rpcuser" = {};
+  sops.secrets."dcrd/rpcpass" = {};
+  sops.secrets."dcrwallet/rpcuser" = {};
+  sops.secrets."dcrwallet/rpcpass" = {};
+
+  # Render vspd.conf owned by the vspd service user/group
+  sops.templates."vspd.conf" = {
+    owner = config.services.vspd.user;
+    group = config.services.vspd.group;
+    mode = "0440";
+    restartUnits = [ "vspd.service" ];
+    content = ''
+      [Application Options]
+      network = mainnet
+      
+      # Web server
+      listen = 0.0.0.0:8800
+      adminpass = ${config.sops.placeholder."vspd/adminpass"}
+      supportemail = support@example.com
+      vspfee = 2.0
+      
+      # dcrd connection
+      dcrdhost = 127.0.0.1:9109
+      dcrduser = ${config.sops.placeholder."dcrd/rpcuser"}
+      dcrdpass = ${config.sops.placeholder."dcrd/rpcpass"}
+      dcrdcert = /var/lib/dcrd/rpc.cert
+      
+      # dcrwallet connections
+      # Multiple wallets are comma-separated
+      wallethost = 10.0.0.1:9110,10.0.0.2:9110,10.0.0.3:9110
+      walletuser = ${config.sops.placeholder."dcrwallet/rpcuser"},${config.sops.placeholder."dcrwallet/rpcuser"},${config.sops.placeholder."dcrwallet/rpcuser"}
+      walletpass = ${config.sops.placeholder."dcrwallet/rpcpass"},${config.sops.placeholder."dcrwallet/rpcpass"},${config.sops.placeholder."dcrwallet/rpcpass"}
+      walletcert = /var/lib/vspd/wallet1.cert,/var/lib/vspd/wallet2.cert,/var/lib/vspd/wallet3.cert
+    '';
+  };
+
+  # Ensure vspd only starts when the config exists
+  systemd.services.vspd.unitConfig.ConditionPathExists =
+    config.sops.templates."vspd.conf".path;
+
+  # Point the module to the rendered config
+  services.vspd = {
+    enable = true;
+    configFile = config.sops.templates."vspd.conf".path;
+  };
+}
+```
+
+## Notes
+
+- `vspd` expects its configuration file to be named `vspd.conf` and located in its home directory. The NixOS module handles this by symlinking the file provided in `configFile` to `/var/lib/vspd/vspd.conf` on startup.
+- `vspd` requires access to the `rpc.cert` files for both `dcrd` and all voting `dcrwallet` instances. Ensure permissions are set correctly so the `vspd` user can read them.
+- `vspd` periodically writes a backup of its database to `{homedir}/data/{network}/vspd.db-backup`.
+Ensure this file is backed up regularly.

flake.nix

@@ -20,6 +20,7 @@
       dcrctl = pkgs.callPackage ./pkgs/dcrctl.nix {};
       dcrwallet = pkgs.callPackage ./pkgs/dcrwallet.nix {};
       bisonw = pkgs.callPackage ./pkgs/bisonw.nix {};
+      vspd = pkgs.callPackage ./pkgs/vspd.nix {};
     });
 
     overlays.default = final: prev: {
@@ -27,17 +28,20 @@
       dcrctl = final.callPackage ./pkgs/dcrctl.nix {};
       dcrwallet = final.callPackage ./pkgs/dcrwallet.nix {};
       bisonw = final.callPackage ./pkgs/bisonw.nix {};
+      vspd = final.callPackage ./pkgs/vspd.nix {};
     };
 
     nixosModules = {
       dcrd = ./modules/dcrd.nix;
       dcrwallet = ./modules/dcrwallet.nix;
       bisonw = ./modules/bisonw.nix;
+      vspd = ./modules/vspd.nix;
       default = { config, lib, pkgs, ... }: {
         imports = [
           self.nixosModules.dcrd
           self.nixosModules.dcrwallet
           self.nixosModules.bisonw
+          self.nixosModules.vspd
         ];
         nixpkgs.overlays = [ self.overlays.default ];
       };

modules/vspd.nix

@@ -0,0 +1,70 @@
+{ config, lib, pkgs, ... }:
+
+let
+  cfg = config.services.vspd;
+in {
+  options.services.vspd = with lib; {
+    enable = mkEnableOption "Voting Service Provider Daemon";
+
+    package = mkOption {
+      type = types.package;
+      default = pkgs.vspd;
+      description = "vspd package to use";
+    };
+
+    user = mkOption {
+      type = types.str;
+      default = "vspd";
+      description = "User to run vspd as";
+    };
+
+    group = mkOption {
+      type = types.str;
+      default = cfg.user;
+      description = "Group to run vspd as";
+    };
+
+    dataDir = mkOption {
+      type = types.path;
+      default = "/var/lib/vspd";
+      description = "State directory for vspd";
+    };
+
+    configFile = mkOption {
+      type = types.path;
+      description = "Path to vspd.conf";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    users.users.${cfg.user} = {
+      group = cfg.group;
+      home = cfg.dataDir;
+      isSystemUser = true;
+      description = "vspd user";
+    };
+
+    users.groups.${cfg.group} = {};
+
+    systemd.services.vspd = {
+      description = "Voting Service Provider Daemon";
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network-online.target" ];
+      wants = [ "network-online.target" ];
+
+      serviceConfig = {
+        User = cfg.user;
+        Group = cfg.group;
+        StateDirectory = "vspd";
+        StateDirectoryMode = "0750";
+        WorkingDirectory = cfg.dataDir;
+        # Link the provided config file to the expected location in homedir
+        ExecStartPre = "${pkgs.bash}/bin/bash -c 'ln -sf ${cfg.configFile} ${cfg.dataDir}/vspd.conf'";
+        ExecStart = "${lib.getExe cfg.package} --homedir=${cfg.dataDir}";
+        Restart = "on-failure";
+        RestartSec = "10s";
+      };
+    };
+  };
+}
+

pkgs/vspd.nix

@@ -0,0 +1,32 @@
+{
+  lib,
+  buildGoModule,
+  fetchFromGitHub,
+}:
+
+buildGoModule (finalAttrs: {
+  pname = "vspd";
+  version = "1.4.0";
+
+  src = fetchFromGitHub {
+    owner = "decred";
+    repo = "vspd";
+    rev = "release-v${finalAttrs.version}";
+    hash = "sha256-V5vLJs82mv7uKjx9V7jx8WqqgC+YSf5XrFMKtBEbke4=";
+  };
+
+  vendorHash = "sha256-c9BUiCOTTRpsJoJ1BteFt9sOOx98eJDOsBV2jRWqx0Y=";
+
+  subPackages = [
+    "cmd/vspd"
+    "cmd/vspadmin"
+  ];
+
+  meta = {
+    homepage = "https://github.com/decred/vspd";
+    description = "Voting Service Provider Daemon";
+    license = with lib.licenses; [ isc ];
+    mainProgram = "vspd";
+  };
+})
+