Module: Wcl::Callback

Defined in:
lib/wcl/callback.rb

Overview

Thread-local callback bridge for custom functions invoked from WASM.

Class Method Summary collapse

Class Method Details

.clear_functions ⇒ Object 



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# File 'lib/wcl/callback.rb', line 12

def clear_functions
  Thread.current[:wcl_functions] = nil
end

.invoke(name, args_json) ⇒ Object 



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# File 'lib/wcl/callback.rb', line 16

def invoke(name, args_json)
  functions = Thread.current[:wcl_functions]
  return [false, "callback not found: #{name}"] if functions.nil? || !functions.key?(name)

  begin
    args = JSON.parse(args_json)
    ruby_args = args.map { |a| json_to_ruby(a) }
    result = functions[name].call(ruby_args)
    result_json = JSON.generate(ruby_to_json(result))
    [true, result_json]
  rescue => e
    [false, e.message]
  end
end

.json_to_ruby(val) ⇒ Object 



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# File 'lib/wcl/callback.rb', line 31

def json_to_ruby(val)
  case val
  when nil, true, false, Integer, Float, String
    val
  when Array
    val.map { |v| json_to_ruby(v) }
  when Hash
    val.transform_values { |v| json_to_ruby(v) }
  else
    val
  end
end

.ruby_to_json(val) ⇒ Object 



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# File 'lib/wcl/callback.rb', line 44

def ruby_to_json(val)
  case val
  when nil, true, false, Integer, Float, String
    val
  when Array
    val.map { |v| ruby_to_json(v) }
  when Hash
    val.transform_values { |v| ruby_to_json(v) }
  when Set
    { "__type" => "set", "items" => val.map { |v| ruby_to_json(v) } }
  else
    val
  end
end

.set_functions(fn_hash) ⇒ Object 



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# File 'lib/wcl/callback.rb', line 8

def set_functions(fn_hash)
  Thread.current[:wcl_functions] = fn_hash
end