Fix rustler_precompiled.download mix task - use correct function

There was a missing piece in the refactor to add support for headers in
v0.8.

This is a fix for #82

CHANGELOG.md

@@ -7,6 +7,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+- Fix return of `available_nifs/1`. It was returning only URLs.
+
+- Fix the "rustler_precompiled.download" mix task to use the correct
+  function for the download of artifacts.
+
+### Changed
+
+- Print SHA256 of artifacts when downloading them from the mix task.
+
 ## [0.8.0] - 2024-08-28
 
 ### Added

lib/mix/tasks/rustler_precompiled.download.ex

@@ -53,21 +53,21 @@ defmodule Mix.Tasks.RustlerPrecompiled.Download do
         )
     end
 
-    urls =
+    nifs_with_urls =
       cond do
         options[:all] ->
-          RustlerPrecompiled.available_nif_urls(module)
+          RustlerPrecompiled.available_nifs(module)
 
         options[:only_local] ->
-          RustlerPrecompiled.current_target_nif_urls(module)
+          RustlerPrecompiled.current_target_nifs(module)
 
         true ->
           raise "you need to specify either \"--all\" or \"--only-local\" flags"
       end
 
-    result = RustlerPrecompiled.download_nif_artifacts_with_checksums!(urls, options)
+    result = RustlerPrecompiled.download_nif_artifacts_with_checksums!(nifs_with_urls, options)
 
-    if options[:print] do
+    if Keyword.get(options, :print, true) do
       result
       |> Enum.map(fn map ->
         {Path.basename(Map.fetch!(map, :path)), Map.fetch!(map, :checksum)}

lib/rustler_precompiled.ex

@@ -291,10 +291,10 @@ defmodule RustlerPrecompiled do
     nif_module
     |> metadata_file()
     |> read_map_from_file()
-    |> nif_urls_from_metadata()
+    |> nifs_from_metadata()
     |> case do
-      {:ok, urls} ->
-        urls
+      {:ok, nifs_with_urls} ->
+        nifs_with_urls
 
       {:error, wrong_meta} ->
         raise "metadata about current target for the module #{inspect(nif_module)} is not available. " <>
@@ -956,12 +956,12 @@ defmodule RustlerPrecompiled do
   # Download a list of files from URLs and calculate its checksum.
   # Returns a list with details of the download and the checksum of each file.
   @doc false
-  def download_nif_artifacts_with_checksums!(urls, options \\ []) do
+  def download_nif_artifacts_with_checksums!(nifs_with_urls, options \\ []) do
     ignore_unavailable? = Keyword.get(options, :ignore_unavailable, false)
     attempts = max_retries(options)
 
     download_results =
-      for {lib_name, url} <- urls,
+      for {lib_name, url} <- nifs_with_urls,
           do: {lib_name, with_retry(fn -> download_nif_artifact(url) end, attempts)}
 
     cache_dir = cache_dir("precompiled_nifs")

test/rustler_precompiled_test.exs

@@ -968,6 +968,71 @@ defmodule RustlerPrecompiledTest do
     end
   end
 
+  describe "available NIFs and download them" do
+    setup do
+      root_path = File.cwd!()
+      nif_fixtures_dir = Path.join(root_path, "test/fixtures")
+      checksum_sample_file = Path.join(nif_fixtures_dir, "checksum-sample-file.exs")
+      checksum_sample = File.read!(checksum_sample_file)
+
+      {:ok, nif_fixtures_dir: nif_fixtures_dir, checksum_sample: checksum_sample}
+    end
+
+    @tag :tmp_dir
+    test "a project downloading precompiled NIFs", %{
+      tmp_dir: tmp_dir,
+      checksum_sample: checksum_sample,
+      nif_fixtures_dir: nif_fixtures_dir
+    } do
+      bypass = Bypass.open()
+
+      in_tmp(tmp_dir, fn ->
+        File.write!("checksum-Elixir.RustlerPrecompilationExample.Native.exs", checksum_sample)
+
+        Bypass.expect_once(bypass, fn conn ->
+          file_name = List.last(conn.path_info)
+          file = File.read!(Path.join([nif_fixtures_dir, "precompiled_nifs", file_name]))
+
+          Plug.Conn.resp(conn, 200, file)
+        end)
+
+        result =
+          capture_log(fn ->
+            config =
+              RustlerPrecompiled.Config.new(
+                otp_app: :rustler_precompiled,
+                module: RustlerPrecompilationExample.Native,
+                base_cache_dir: tmp_dir,
+                base_url: "http://localhost:#{bypass.port}/download",
+                version: "0.2.0",
+                crate: "example",
+                targets: @available_targets,
+                nif_versions: @default_nif_versions,
+                force_build: false
+              )
+
+            {:ok, metadata} = RustlerPrecompiled.build_metadata(config)
+
+            assert {:ok, nifs_with_urls} = RustlerPrecompiled.nifs_from_metadata(metadata)
+
+            assert [{lib_name, {url, []}} = first | _] = nifs_with_urls
+
+            assert "libexample" <> _ = lib_name
+            assert "http://localhost" <> _ = url
+
+            results =
+              RustlerPrecompiled.download_nif_artifacts_with_checksums!([first], all: true)
+
+            assert [%{path: _, lib_name: _, checksum: _, checksum_algo: _}] = results
+          end)
+
+        assert result =~ "Downloading"
+        assert result =~ "http://localhost:#{bypass.port}/download"
+        assert result =~ "NIF cached at"
+      end)
+    end
+  end
+
   describe "nif_urls_from_metadata/1" do
     test "builds a list of tar gz urls and its variants" do
       base_url =