Add notification lib

.envrc

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+use flake

.gitignore

@@ -0,0 +1 @@
+.direnv/

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1749285348,
+        "narHash": "sha256-frdhQvPbmDYaScPFiCnfdh3B/Vh81Uuoo0w5TkWmmjU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "3e3afe5174c561dee0df6f2c2b2236990146329f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "Libraries for use in my homelab";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+  outputs =
+    { self, nixpkgs }:
+    let
+      allSystems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "x86_64-darwin"
+        "aarch64-darwin"
+      ];
+      forAllSystems =
+        f:
+        nixpkgs.lib.genAttrs allSystems (
+          system:
+          f {
+            pkgs = import nixpkgs { inherit system; };
+          }
+        );
+    in
+    {
+      overlays.default = final: prev: {
+        ghettoptt = self.packages.${prev.system}.default;
+      };
+
+      devShells = forAllSystems (
+        { pkgs }:
+        {
+          default = pkgs.mkShell {
+            packages = with pkgs; [
+              go
+              golangci-lint
+            ];
+          };
+        }
+      );
+    };
+}

go.mod

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+module git.t-juice.club/torjus/libhlab
+
+go 1.24.3
+
+require (
+	github.com/nats-io/nats.go v1.43.0
+	github.com/nats-io/nkeys v0.4.11
+)
+
+require (
+	github.com/klauspost/compress v1.18.0 // indirect
+	github.com/nats-io/nuid v1.0.1 // indirect
+	golang.org/x/crypto v0.37.0 // indirect
+	golang.org/x/sys v0.32.0 // indirect
+)

go.sum

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+github.com/klauspost/compress v1.18.0 h1:c/Cqfb0r+Yi+JtIEq73FWXVkRonBlf0CRNYc8Zttxdo=
+github.com/klauspost/compress v1.18.0/go.mod h1:2Pp+KzxcywXVXMr50+X0Q/Lsb43OQHYWRCY2AiWywWQ=
+github.com/nats-io/nats.go v1.43.0 h1:uRFZ2FEoRvP64+UUhaTokyS18XBCR/xM2vQZKO4i8ug=
+github.com/nats-io/nats.go v1.43.0/go.mod h1:iRWIPokVIFbVijxuMQq4y9ttaBTMe0SFdlZfMDd+33g=
+github.com/nats-io/nkeys v0.4.11 h1:q44qGV008kYd9W1b1nEBkNzvnWxtRSQ7A8BoqRrcfa0=
+github.com/nats-io/nkeys v0.4.11/go.mod h1:szDimtgmfOi9n25JpfIdGw12tZFYXqhGxjhVxsatHVE=
+github.com/nats-io/nuid v1.0.1 h1:5iA8DT8V7q8WK2EScv2padNa/rTESc1KdnPw4TC2paw=
+github.com/nats-io/nuid v1.0.1/go.mod h1:19wcPz3Ph3q0Jbyiqsd0kePYG7A95tJPxeL+1OSON2c=
+golang.org/x/crypto v0.37.0 h1:kJNSjF/Xp7kU0iB2Z+9viTPMW4EqqsrywMXLJOOsXSE=
+golang.org/x/crypto v0.37.0/go.mod h1:vg+k43peMZ0pUMhYmVAWysMK35e6ioLh3wB8ZCAfbVc=
+golang.org/x/sys v0.32.0 h1:s77OFDvIQeibCmezSnk/q6iAfkdiQaJi4VzroCFrN20=
+golang.org/x/sys v0.32.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=

notify/notify.go

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+package notify
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/nats-io/nats.go"
+	"github.com/nats-io/nkeys"
+)
+
+const DEFAULT_SUBJECT = "home2rjusnet.notifications"
+
+type BusNotification struct {
+	ID      uint32        `json:"id,omitempty"`
+	Summary string        `json:"summary"`
+	Body    string        `json:"body,omitempty"`
+	Timeout time.Duration `json:"timeout,omitempty"`
+}
+
+type NotificationService struct {
+	Subject string
+	nc      *nats.Conn
+}
+
+func NewNotificationService(url, nkey string) (*NotificationService, error) {
+	kp, err := nkeys.FromSeed([]byte(nkey))
+	if err != nil {
+		return nil, fmt.Errorf("error creating nkey: %v", err)
+	}
+
+	pub, err := kp.PublicKey()
+	if err != nil {
+		return nil, fmt.Errorf("error getting public key: %v", err)
+	}
+
+	opt := nats.Nkey(pub, kp.Sign)
+
+	nc, err := nats.Connect(url, opt)
+	if err != nil {
+		return nil, fmt.Errorf("error connecting to nats: %v", err)
+	}
+
+	return &NotificationService{nc: nc, Subject: DEFAULT_SUBJECT}, nil
+}
+
+func (n *NotificationService) Notify(msg *BusNotification) error {
+	data, err := json.Marshal(msg)
+	if err != nil {
+		return fmt.Errorf("error marshalling notification: %v", err)
+	}
+
+	err = n.nc.Publish(n.Subject, data)
+	if err != nil {
+		return fmt.Errorf("error publishing notification: %v", err)
+	}
+
+	return nil
+}
+
+func (n *NotificationService) Close() {
+	n.nc.Close()
+}