build: github workflow to generate NIF binaries

.github/workflows/binaries.yml

@@ -0,0 +1,52 @@
+name: NIF binaries
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - "native/**"
+      - ".github/workflows/binaries.yml"
+    tags:
+      - "*"
+  pull_request:
+    paths:
+      - ".github/workflows/binaries.yml"
+  workflow_dispatch:
+
+jobs:
+  build_binary:
+    name: ${{ matrix.job.target }} / ${{ matrix.job.os }}
+    runs-on: ${{ matrix.job.os }}
+    permissions:
+      contents: write
+    strategy:
+      fail-fast: false
+      matrix:
+        nif_version: ["2.16"]
+        job:
+          - { target: x86_64-apple-darwin , os: macos-12 }
+          - { target: x86_64-pc-windows-gnu , os: windows-2022 }
+          - { target: x86_64-unknown-linux-gnu , os: ubuntu-22.04 }
+
+    steps:
+      - uses: actions/checkout@v4
+      - run: rustup target add ${{ matrix.job.target }}
+      - run: echo "PROJECT_VERSION=$(sed -n 's/^  @version "\(.*\)"/\1/p' mix.exs | head -n1)" >> $GITHUB_ENV
+
+      - uses: philss/[email protected]
+        id: precompile
+        with:
+          project-dir: "native/candlex"
+          project-name: candlex
+          project-version: ${{ env.PROJECT_VERSION }}
+          target: ${{ matrix.job.target }}
+          nif-version: ${{ matrix.nif_version }}
+          # use-cross: false doesn't work
+          # I think because of https://github.com/actions/runner/issues/1173
+          use-cross: null
+
+      - uses: softprops/action-gh-release@v1
+        with:
+          files: ${{ steps.precompile.outputs.file-path }}
+        if: startsWith(github.ref, 'refs/tags/')

.github/workflows/ci.yml

@@ -4,9 +4,12 @@ on:
   push:
     branches:
       - main
+
 jobs:
   main:
     runs-on: ubuntu-latest
+    env:
+      CANDLE_BUILD: true
     strategy:
       fail-fast: false
       matrix:

README.md

@@ -23,6 +23,17 @@ Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_do
 and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
 be found at <https://hexdocs.pm/candlex>.
 
+## Releasing
+
+To publish a new version of this package:
+
+1. Update `@version` in `mix.exs`.
+1. Create and push a new tag.
+1. Wait for the `binaries.yml` GitHub workflow to build all the binaries.
+1. Generate checksums locally.
+1. Publish the release from draft in GitHub.
+1. Publish package to Hex.
+
 ## License
 
 Copyright 2023 Mimiquate

lib/candlex/native.ex

@@ -1,7 +1,20 @@
 defmodule Candlex.Native do
   @moduledoc false
 
-  use Rustler, otp_app: :candlex, features: Application.compile_env(:candlex, :crate_features, [])
+  version = Mix.Project.config()[:version]
+  source_url = "https://github.com/mimiquate/candlex"
+
+  use RustlerPrecompiled,
+    otp_app: :candlex,
+    features: Application.compile_env(:candlex, :crate_features, []),
+    base_url: "#{source_url}/releases/download/v#{version}",
+    force_build: System.get_env("CANDLE_BUILD") in ["1", "true"],
+    version: version,
+    targets: [
+      "x86_64-apple-darwin",
+      "x86_64-pc-windows-gnu",
+      "x86_64-unknown-linux-gnu"
+    ]
 
   # Rustler will override all the below stub functions with real NIFs
   def from_binary(_binary, _dtype, _shape, _device), do: error()

mix.exs

@@ -33,10 +33,11 @@ defmodule Candlex.MixProject do
   defp deps do
     [
       {:nx, "~> 0.6.2"},
-      {:rustler, "~> 0.30.0"},
+      {:rustler_precompiled, "~> 0.7.0"},
 
       # Dev
-      {:ex_doc, "~> 0.30.9", only: :dev, runtime: false}
+      {:ex_doc, "~> 0.30.9", only: :dev, runtime: false},
+      {:rustler, "~> 0.30.0", optional: true}
     ]
   end
 
@@ -50,7 +51,16 @@ defmodule Candlex.MixProject do
 
   defp package do
     [
-      files: ["lib", "native", "priv", ".formatter.exs", "mix.exs", "README.md", "LICENSE"],
+      files: [
+        "lib",
+        "native",
+        "priv",
+        ".formatter.exs",
+        "mix.exs",
+        "README.md",
+        "LICENSE",
+        "checksum-*.exs"
+      ],
       licenses: ["Apache-2.0"],
       links: %{
         "GitHub" => @source_url

mix.lock

@@ -1,4 +1,5 @@
 %{
+  "castore": {:hex, :castore, "1.0.4", "ff4d0fb2e6411c0479b1d965a814ea6d00e51eb2f58697446e9c41a97d940b28", [:mix], [], "hexpm", "9418c1b8144e11656f0be99943db4caf04612e3eaecefb5dae9a2a87565584f8"},
   "complex": {:hex, :complex, "0.5.0", "af2d2331ff6170b61bb738695e481b27a66780e18763e066ee2cd863d0b1dd92", [:mix], [], "hexpm", "2683bd3c184466cfb94fad74cbfddfaa94b860e27ad4ca1bffe3bff169d91ef1"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.37", "2ad73550e27c8946648b06905a57e4d454e4d7229c2dafa72a0348c99d8be5f7", [:mix], [], "hexpm", "6b19783f2802f039806f375610faa22da130b8edc21209d0bff47918bb48360e"},
   "ex_doc": {:hex, :ex_doc, "0.30.9", "d691453495c47434c0f2052b08dd91cc32bc4e1a218f86884563448ee2502dd2", [:mix], [{:earmark_parser, "~> 1.4.31", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.14", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1", [hex: :makeup_erlang, repo: "hexpm", optional: false]}], "hexpm", "d7aaaf21e95dc5cddabf89063327e96867d00013963eadf2c6ad135506a8bc10"},
@@ -9,6 +10,7 @@
   "nimble_parsec": {:hex, :nimble_parsec, "1.3.1", "2c54013ecf170e249e9291ed0a62e5832f70a476c61da16f6aac6dca0189f2af", [:mix], [], "hexpm", "2682e3c0b2eb58d90c6375fc0cc30bc7be06f365bf72608804fb9cffa5e1b167"},
   "nx": {:hex, :nx, "0.6.2", "f1d137f477b1a6f84f8db638f7a6d5a0f8266caea63c9918aa4583db38ebe1d6", [:mix], [{:complex, "~> 0.5", [hex: :complex, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4.0 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "ac913b68d53f25f6eb39bddcf2d2cd6ea2e9bcb6f25cf86a79e35d0411ba96ad"},
   "rustler": {:hex, :rustler, "0.30.0", "cefc49922132b072853fa9b0ca4dc2ffcb452f68fb73b779042b02d545e097fb", [:mix], [{:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}, {:toml, "~> 0.6", [hex: :toml, repo: "hexpm", optional: false]}], "hexpm", "9ef1abb6a7dda35c47cfc649e6a5a61663af6cf842a55814a554a84607dee389"},
+  "rustler_precompiled": {:hex, :rustler_precompiled, "0.7.0", "5d0834fc06dbc76dd1034482f17b1797df0dba9b491cef8bb045fcaca94bcade", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: false]}, {:rustler, "~> 0.23", [hex: :rustler, repo: "hexpm", optional: true]}], "hexpm", "fdf43a6835f4e4de5bfbc4c019bfb8c46d124bd4635fefa3e20d9a2bbbec1512"},
   "telemetry": {:hex, :telemetry, "1.2.1", "68fdfe8d8f05a8428483a97d7aab2f268aaff24b49e0f599faa091f1d4e7f61c", [:rebar3], [], "hexpm", "dad9ce9d8effc621708f99eac538ef1cbe05d6a874dd741de2e689c47feafed5"},
   "toml": {:hex, :toml, "0.7.0", "fbcd773caa937d0c7a02c301a1feea25612720ac3fa1ccb8bfd9d30d822911de", [:mix], [], "hexpm", "0690246a2478c1defd100b0c9b89b4ea280a22be9a7b313a8a058a2408a2fa70"},
 }

native/candlex/.cargo/config.toml

@@ -3,3 +3,7 @@ rustflags = [
     "-C", "link-arg=-undefined",
     "-C", "link-arg=dynamic_lookup",
 ]
+
+# Provides a small build size, but takes more time to build.
+[profile.release]
+lto = true

native/candlex/Cargo.toml

@@ -13,7 +13,7 @@ crate-type = ["cdylib"]
 candle-core = { git = "https://github.com/huggingface/candle" }
 half = "2.3.1"
 num-traits = "0.2.17"
-rustler = "0.30.0"
+rustler = { version = "0.30.0", default-features = false, features = ["derive", "nif_version_2_16"] }
 statrs = "0.16.0"
 thiserror = "1.0.50"