feat(faucet): add nixos module (#760)

faucet/README.md

@@ -0,0 +1,3 @@
+# Faucet
+
+This implements a build process for [cosmos-faucet](https://github.com/okp4/cosmos-faucet) and a nixosModule for easy deployments.

faucet/faucet.nix

@@ -0,0 +1,142 @@
+{ self, ... }: {
+  perSystem = { self', pkgs, ... }:
+    let
+      faucet = pkgs.buildGoModule {
+        name = "faucet";
+        vendorSha256 = "sha256-LDu9GSgMsCHTk5K7hsEhLg36SatUpgQZrOdEvuPSM84=";
+        meta.mainProgram = "cosmos-faucet";
+        version = "2.0.0";
+        src = pkgs.fetchFromGitHub {
+          name = "faucet";
+          owner = "okp4";
+          repo = "cosmos-faucet";
+          rev = "18ac81747e6ea9503b13b65ec01388c498caaa9c";
+          sha256 = "sha256-re7c0itkTmDwuvuwluLxhrpAyngzMhp9Ec9DuOGlvfc=";
+        };
+      };
+    in
+    {
+      packages = {
+        inherit faucet;
+
+        faucet-image = pkgs.dockerTools.buildLayeredImage {
+          name = "faucet";
+          contents = [ pkgs.coreutils-full pkgs.cacert self'.packages.faucet ];
+          config = {
+            Entrypoint = [ (pkgs.lib.getExe self'.packages.faucet) ];
+            Env = [ "SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt" ];
+          };
+        };
+      };
+    };
+
+  flake.nixosModules.faucet = { lib, pkgs, config, ... }:
+    with lib;
+    let cfg = config.services.faucet;
+    in {
+      options.services.faucet = {
+        enable = mkEnableOption "Faucet service";
+        package = mkOption {
+          type = types.package;
+          default = self.packages.${pkgs.system}.faucet;
+        };
+        home = mkOption {
+          type = types.str;
+          default = "";
+          description = "the home folder";
+        };
+        mnemonic = mkOption {
+          type = types.str;
+          default = "";
+          description = "wallet mnemonic";
+        };
+        address = mkOption {
+          type = types.str;
+          default = ":8080";
+          description = "graphql api address";
+        };
+        captcha-secret = mkOption {
+          type = types.str;
+          default = "";
+          description = "if set, a captcha is required";
+        };
+        captcha-verify-url = mkOption {
+          type = types.str;
+          default = "https://www.google.com/recaptcha/api/siteverify";
+          description = "Captcha verify URL";
+        };
+        chain-id = mkOption {
+          type = types.str;
+          default = "union-testnet-3";
+        };
+        denom = mkOption {
+          type = types.str;
+          default = "muno";
+        };
+        memo = mkOption {
+          type = types.str;
+          default = "Join the Union";
+        };
+        prefix = mkOption {
+          type = types.str;
+          default = "union1";
+        };
+        amount-send = mkOption {
+          type = types.int;
+          default = 1;
+        };
+        grpc-address = mkOption {
+          type = types.str;
+          default = "127.0.0.1:9090";
+          description = "grpc address of the node";
+        };
+        extra-args = mkOption {
+          type = types.str;
+          default = "";
+          description = "extra arguments to pass to the command";
+        };
+      };
+
+      config = mkIf cfg.enable {
+        systemd.services.faucet =
+          let
+            faucet-systemd-script = pkgs.writeShellApplication {
+              name = "faucet-systemd";
+              runtimeInputs = [ pkgs.coreutils cfg.package ];
+              text =
+                let
+                  captcha = if cfg.captcha-secret != "" then "--captcha --captcha-secret '${cfg.captcha-secret}'" else "";
+                  captcha-verify-url = if cfg.captcha-verify-url != "" then "--captcha-verify-url '${cfg.captcha-verify-url}'" else "";
+                in
+                ''
+                  ${pkgs.lib.getExe cfg.package}  \
+                      --chain-id '${cfg.chain-id}' \
+                      --denom '${cfg.denom}' \
+                      --memo '${cfg.memo}' \
+                      --prefix '${cfg.prefix}' \
+                      start \
+                      ${captcha} \
+                      ${captcha-verify-url} \
+                      --address '${cfg.address}' \
+                      --amount-send ${toString cfg.amount-send} \
+                      --grpc-address ${cfg.grpc-address} \
+                      --mnemonic '${cfg.mnemonic}' ${cfg.extra-args}
+                '';
+            };
+          in
+          {
+            wantedBy = [ "multi-user.target" ];
+            description = "Faucet";
+            serviceConfig = {
+              Type = "simple";
+              ExecStart = pkgs.lib.getExe faucet-systemd-script;
+              Restart = mkForce "always";
+            };
+            environment = {
+              HOME = cfg.home;
+            };
+          };
+      };
+    };
+
+}

flake.nix

@@ -135,6 +135,7 @@
         ./e2e/all-tests.nix
         ./e2e/e2e.nix
         ./lib/unionlabs/fuzz/default.nix
+        ./faucet/faucet.nix
         treefmt-nix.flakeModule
       ];