Class: Grape::Middleware::Error

Inherits:
Base
  • Object
show all
Defined in:
lib/grape/middleware/error.rb

Instance Attribute Summary

Attributes inherited from Base

#app, #env, #options

Instance Method Summary collapse

Methods inherited from Base

#after, #before, #call, #content_type, #content_type_for, #content_types, #initialize, #mime_types, #response

Constructor Details

This class inherits a constructor from Grape::Middleware::Base

Instance Method Details

#call!(env) ⇒ Object 



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# File 'lib/grape/middleware/error.rb', line 22

def call!(env)
  @env = env

  begin
    error_response(catch(:error) do
      return @app.call(@env)
    end)
  rescue StandardError => e
    is_rescuable = rescuable?(e.class)
    if e.is_a?(Grape::Exceptions::Base) && !is_rescuable
      handler = lambda { |arg| error_response(arg) }
    else
      raise unless is_rescuable
      handler = find_handler(e.class)
    end

    handler.nil? ? handle_error(e) : exec_handler(e, &handler)
  end
end

#default_options ⇒ Object 



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# File 'lib/grape/middleware/error.rb', line 6

def default_options
  {
    default_status: 500, # default status returned on error
    default_message: "",
    format: :txt,
    formatters: {},
    error_formatters: {},
    rescue_all: false, # true to rescue all exceptions
    rescue_subclasses: true, # rescue subclasses of exceptions listed
    rescue_options: { backtrace: false }, # true to display backtrace
    rescue_handlers: {}, # rescue handler blocks
    base_only_rescue_handlers: {}, # rescue handler blocks rescuing only the base class
    all_rescue_handler: nil # rescue handler block to rescue from all exceptions
  }
end

#error_response(error = {}) ⇒ Object 



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# File 'lib/grape/middleware/error.rb', line 65

def error_response(error = {})
  status = error[:status] || options[:default_status]
  message = error[:message] || options[:default_message]
  headers = { 'Content-Type' => content_type }
  headers.merge!(error[:headers]) if error[:headers].is_a?(Hash)
  backtrace = error[:backtrace] || []
  rack_response(format_message(message, backtrace), status, headers)
end

#exec_handler(e, &handler) ⇒ Object 



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# File 'lib/grape/middleware/error.rb', line 53

def exec_handler(e, &handler)
  if handler.lambda? && handler.arity == 0
    instance_exec(&handler)
  else
    instance_exec(e, &handler)
  end
end

#find_handler(klass) ⇒ Object 



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# File 'lib/grape/middleware/error.rb', line 42

def find_handler(klass)
  handler = options[:rescue_handlers].find(-> { [] }) { |error, _| klass <= error }[1]
  handler ||= options[:base_only_rescue_handlers][klass]
  handler ||= options[:all_rescue_handler]
  handler
end

#format_message(message, backtrace) ⇒ Object 



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# File 'lib/grape/middleware/error.rb', line 78

def format_message(message, backtrace)
  format = env['api.format'] || options[:format]
  formatter = Grape::ErrorFormatter::Base.formatter_for(format, options)
  throw :error, status: 406, message: "The requested format '#{format}' is not supported." unless formatter
  formatter.call(message, backtrace, options, env)
end

#handle_error(e) ⇒ Object 



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# File 'lib/grape/middleware/error.rb', line 61

def handle_error(e)
  error_response(message: e.message, backtrace: e.backtrace)
end

#rack_response(message, status = , headers = { 'Content-Type' => content_type }) ⇒ Object 



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# File 'lib/grape/middleware/error.rb', line 74

def rack_response(message, status = options[:default_status], headers = { 'Content-Type' => content_type })
  Rack::Response.new([message], status, headers).finish
end

#rescuable?(klass) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/grape/middleware/error.rb', line 49

def rescuable?(klass)
  options[:rescue_all] || (options[:rescue_handlers] || []).any? { |error, handler| klass <= error } || (options[:base_only_rescue_handlers] || []).include?(klass)
end