Class: Wasmify::Rails::Packer

Inherits:
Object
  • Object
show all
Includes:
ActionView::Helpers::NumberHelper
Defined in:
lib/wasmify/rails/packer.rb

Overview

A wrapper for wasi-vfs to add application source code to the ruby.wasm module

Constant Summary collapse

ROOT_FILES = 
%w[Gemfile config.ru .ruby-version Rakefile]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(output_dir: Wasmify::Rails.config.output_dir) ⇒ Packer

Returns a new instance of Packer.



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# File 'lib/wasmify/rails/packer.rb', line 34

def initialize(output_dir: Wasmify::Rails.config.output_dir)
  @output_dir = output_dir
end

Instance Attribute Details

#output_dir ⇒ Object (readonly)

Returns the value of attribute output_dir.



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# File 'lib/wasmify/rails/packer.rb', line 13

def output_dir
  @output_dir
end

Instance Method Details

#run(ruby_wasm_path:, name:, directories: Wasmify::Rails.config.pack_directories, storage_dir: nil) ⇒ Object 



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# File 'lib/wasmify/rails/packer.rb', line 38

def run(ruby_wasm_path:, name:, directories: Wasmify::Rails.config.pack_directories, storage_dir: nil)
  unless system("which wasi-vfs > /dev/null 2>&1")
    raise "wasi-vfs is required to pack the application.\n" +
         "Please see installations instructions at: https://github.com/kateinoigakukun/wasi-vfs"
  end

  pack_root = Wasmify::Rails.config.pack_root

  args = %W[
    pack #{ruby_wasm_path}
  ]

  directories.each do |dir|
    args << "--dir #{Wasmify::Rails.config.root_dir.join(dir)}::#{pack_root}/#{dir}"
  end

  output_path = File.join(output_dir, name)

  FileUtils.mkdir_p(output_dir)

  # Generate a temporary directory with the require root files
  Dir.mktmpdir do |tdir|
    (ROOT_FILES + (Wasmify::Rails.config.additional_root_files || [])).each do |file|
      FileUtils.cp(Wasmify::Rails.config.root_dir.join(file), tdir) if File.exist?(Wasmify::Rails.config.root_dir.join(file))
    end

    # Create a storage/ directory for Active Storage attachments
    FileUtils.mkdir_p(File.join(tdir, storage_dir)) if storage_dir

    args << "--dir #{tdir}::#{pack_root}"

    args << "-o #{output_path}"

    spawn("wasi-vfs #{args.join(" ")}").then { Process.wait(_1) }
  end

  $stdout.puts "Packed the application to #{output_path}\n" \
               "Size: #{number_to_human_size(File.size(output_path))}"
end