Class: Immunio::ExceptionHandler

Inherits:
Object
  • Object
show all
Defined in:
lib/immunio/plugins/exception_handler.rb

Overview

Rack middleware trigger proper hook whenever an exception is raised in the app.

Instance Method Summary collapse

Constructor Details

#initialize(app) ⇒ ExceptionHandler

Returns a new instance of ExceptionHandler.



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# File 'lib/immunio/plugins/exception_handler.rb', line 7

def initialize(app)
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/immunio/plugins/exception_handler.rb', line 11

def call(env)
  @app.call(env)
rescue RequestBlocked
  Request.time "plugin", "#{Module.nesting[0]}::#{__method__}[RequestBlocked]" do
    # Avoid bubbling exception to logging middlewares.
    Immunio.blocked_app.call(env)
  end
rescue OverrideResponse => override
  status, headers, body = Immunio.override_response.call(env, override)

  Immunio.run_hook "http_tracker", "http_response_start",
    status: status, headers: headers
  [status, headers, body]
rescue StandardError => e
  Request.time "plugin", "#{Module.nesting[0]}::#{__method__}[#{e.class}]" do
    # Check for template, DB errors and such generated by the agent.
    original_exception = unwrap_exception(e)
    if RequestBlocked === original_exception || original_exception.message =~ /^Immunio::RequestBlocked:/
      return Immunio.blocked_app.call(env)
    end
    if OverrideResponse === original_exception  # We can't do anything with just the message:
      status, headers, body = Immunio.override_response.call(env, original_exception)

      Immunio.run_hook "http_tracker", "http_response_start",
        status: status, headers: headers
      return [status, headers, body]
    end

    # A real app exception, not generated by the agent.
    Immunio.run_hook! "exception_handler", "exception", exception: "#{e.class.name}: #{e}"

    # Re-raise
    raise
  end
end

#unwrap_exception(e) ⇒ Object

Unwrap the innermost original exception.



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# File 'lib/immunio/plugins/exception_handler.rb', line 48

def unwrap_exception(e)
  if Rails::VERSION::MAJOR > 4
    while e.respond_to?(:cause) && e.cause.is_a?(Exception)
      e = e.cause
    end
  else
    while e.respond_to?(:original_exception) && e.original_exception.is_a?(Exception)
      e = e.original_exception
    end
  end
  e
end