Nix flake (#5)

* Add nix flake setup

* Add reference to nix apps provided by the nix flake

Signed-off-by: Milos Gajdos <[email protected]>

---------

Signed-off-by: Milos Gajdos <[email protected]>

Author: milosgajdos

README.md

@@ -12,3 +12,21 @@ Currently supported APIs:
 * [x] [Google Vertex AI](https://cloud.google.com/vertex-ai/docs/generative-ai/embeddings/get-text-embeddings)
 
 There are also simple command line tools provided by this project that let you query the APIs for text embeddings passed in via cli flags.
+
+## nix
+
+The project provides a simple `nix` flake tha leverages [gomod2nix](https://github.com/nix-community/gomod2nix) for consistent Go environments and builds.
+
+To get started just run
+```shell
+nix develop
+```
+
+And you'll be dropped into development shell.
+
+In addition, each command is exposed as a `nix` app so you can run them as follows:
+```shell
+nix run ".#vertexai" -- -help
+```
+
+**NOTE:** `gomod2nix` vendors dependencies into `nix` store so every time you add a new dependency you must run `gomod2nix generate` that updates `gomod2nix.toml`

default.nix

@@ -0,0 +1,22 @@
+{ pkgs ? (
+    let
+      inherit (builtins) fetchTree fromJSON readFile;
+      inherit ((fromJSON (readFile ./flake.lock)).nodes) nixpkgs gomod2nix;
+    in
+    import (fetchTree nixpkgs.locked) {
+      overlays = [
+        (import "${fetchTree gomod2nix.locked}/overlay.nix")
+      ];
+    }
+  )
+, buildGoApplication ? pkgs.buildGoApplication
+}:
+
+buildGoApplication {
+  pname = "go-embeddings";
+  version = "0.1";
+  pwd = ./.;
+  src = ./.;
+  modules = ./gomod2nix.toml;
+  doCheck = false;
+}

flake.lock

@@ -0,0 +1,43 @@
+{
+  description = "go-embeddings nix flake";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+  inputs.gomod2nix.url = "github:nix-community/gomod2nix";
+  inputs.gomod2nix.inputs.nixpkgs.follows = "nixpkgs";
+  inputs.gomod2nix.inputs.flake-utils.follows = "flake-utils";
+
+  outputs = { self, nixpkgs, flake-utils, gomod2nix }:
+    (flake-utils.lib.eachDefaultSystem
+      (system:
+        let
+          pkgs = nixpkgs.legacyPackages.${system};
+
+          # The current default sdk for macOS fails to compile go projects, so we use a newer one for now.
+          # This has no effect on other platforms.
+          callPackage = pkgs.darwin.apple_sdk_11_0.callPackage or pkgs.callPackage;
+        in
+        {
+          packages.default = callPackage ./. {
+            inherit (gomod2nix.legacyPackages.${system}) buildGoApplication;
+          };
+          devShells.default = callPackage ./shell.nix {
+            inherit (gomod2nix.legacyPackages.${system}) mkGoEnv gomod2nix;
+          };
+          apps = {
+            cohere = {
+              type = "app";
+              program = "${self.packages.${system}.default}/bin/cohere";
+            };
+            openai = {
+              type = "app";
+              program = "${self.packages.${system}.default}/bin/openai";
+            };
+            vertexai = {
+              type = "app";
+              program = "${self.packages.${system}.default}/bin/vertexai";
+            };
+          };
+        })
+    );
+}

flake.nix

@@ -0,0 +1,24 @@
+schema = 3
+
+[mod]
+  [mod."cloud.google.com/go/compute"]
+    version = "v1.20.1"
+    hash = "sha256-HQvSLdoSagQsuqOb/D9+xMc8nE9Y44Z30rQgd2AGEr8="
+  [mod."cloud.google.com/go/compute/metadata"]
+    version = "v0.2.3"
+    hash = "sha256-kYB1FTQRdTDqCqJzSU/jJYbVUGyxbkASUKbEs36FUyU="
+  [mod."github.com/golang/protobuf"]
+    version = "v1.5.3"
+    hash = "sha256-svogITcP4orUIsJFjMtp+Uv1+fKJv2Q5Zwf2dMqnpOQ="
+  [mod."golang.org/x/net"]
+    version = "v0.19.0"
+    hash = "sha256-3M5rKEvJx4cO/q+06cGjR5sxF5JpnUWY0+fQttrWdT4="
+  [mod."golang.org/x/oauth2"]
+    version = "v0.15.0"
+    hash = "sha256-exA/abu6WOR7Cwqa41LpnTD2xQNRZMYU5CnBKvXHx8Y="
+  [mod."google.golang.org/appengine"]
+    version = "v1.6.7"
+    hash = "sha256-zIxGRHiq4QBvRqkrhMGMGCaVL4iM4TtlYpAi/hrivS4="
+  [mod."google.golang.org/protobuf"]
+    version = "v1.31.0"
+    hash = "sha256-UdIk+xRaMfdhVICvKRk1THe3R1VU+lWD8hqoW/y8jT0="

gomod2nix.toml

@@ -0,0 +1,26 @@
+{ pkgs ? (
+    let
+      inherit (builtins) fetchTree fromJSON readFile;
+      inherit ((fromJSON (readFile ./flake.lock)).nodes) nixpkgs gomod2nix;
+    in
+    import (fetchTree nixpkgs.locked) {
+      overlays = [
+        (import "${fetchTree gomod2nix.locked}/overlay.nix")
+      ];
+    }
+  )
+, mkGoEnv ? pkgs.mkGoEnv
+, gomod2nix ? pkgs.gomod2nix
+, golangci-lint ? pkgs.golangci-lint
+}:
+
+let
+  goEnv = mkGoEnv { pwd = ./.; };
+in
+pkgs.mkShell {
+  packages = [
+    goEnv
+    gomod2nix
+    golangci-lint
+  ];
+}