Class: HttpMimic::JSRuntime

Inherits:
Object
  • Object
show all
Defined in:
lib/http_mimic/js_runtime.rb

Constant Summary collapse

STDIN_RUNNER = 
<<~JS
  const input = std.in.readAsString();
  const result = eval(input);
  if (result !== undefined) {
    if (typeof result === "object" && result !== null) {
      console.log(JSON.stringify(result));
    } else {
      console.log(result);
    }
  }
JS

Class Method Summary collapse

Class Method Details

.eval(js_code, timeout: nil, install_dir: nil, auto_download: nil) ⇒ Object

Raises:



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# File 'lib/http_mimic/js_runtime.rb', line 22

def eval(js_code, timeout: nil, install_dir: nil, auto_download: nil)
  ensure_qjs_installed!(install_dir: install_dir, auto_download: auto_download)

  qjs_bin = Downloader.qjs_path(install_dir: install_dir)
  raise BinaryNotFoundError, "QuickJS binary 'qjs' not found. Run HttpMimic.download_qjs! to install." unless qjs_bin

  cmd = [qjs_bin, '--std', '-e', STDIN_RUNNER]
  effective_timeout = timeout || HttpMimic.configuration.default_timeout

  stdout = nil
  stderr = nil
  status = nil

  begin
    if effective_timeout && effective_timeout > 0
      Timeout.timeout(effective_timeout) do
        stdout, stderr, status = Open3.capture3(*cmd, stdin_data: js_code.to_s)
      end
    else
      stdout, stderr, status = Open3.capture3(*cmd, stdin_data: js_code.to_s)
    end
  rescue Timeout::Error
    raise JSTimeoutError.new("JavaScript execution timed out after #{effective_timeout}s")
  end

  unless status && status.success?
    raise JSError.new(
      "JavaScript execution failed: #{stderr.to_s.strip}",
      stderr: stderr,
      exit_code: status ? status.exitstatus : nil
    )
  end

  stdout.to_s.strip
end

.eval_json(js_code, timeout: nil, install_dir: nil, auto_download: nil) ⇒ Object 



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# File 'lib/http_mimic/js_runtime.rb', line 58

def eval_json(js_code, timeout: nil, install_dir: nil, auto_download: nil)
  output = eval(js_code, timeout: timeout, install_dir: install_dir, auto_download: auto_download)
  return nil if output.nil? || output.empty?

  JSON.parse(output)
rescue JSON::ParserError => e
  raise ResponseParseError, "Failed to parse JavaScript JSON output: #{e.message} (Output: #{output.inspect})"
end