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require 'action_dispatch/http/request'
require 'action_dispatch/middleware/exception_wrapper'
require 'action_dispatch/routing/inspector'
module ActionDispatch
# This middleware is responsible for logging exceptions and
# showing a debugging page in case the request is local.
class DebugExceptions
RESCUES_TEMPLATE_PATH = File.expand_path('../templates', __FILE__)
def initialize(app, routes_app = nil)
@app = app
@routes_app = routes_app
end
def call(env)
_, headers, body = response = @app.call(env)
if headers['X-Cascade'] == 'pass'
body.close if body.respond_to?(:close)
raise ActionController::RoutingError, "No route matches [#{env['REQUEST_METHOD']}] #{env['PATH_INFO'].inspect}"
end
response
rescue Exception => exception
raise exception if env['action_dispatch.show_exceptions'] == false
render_exception(env, exception)
end
private
def render_exception(env, exception)
wrapper = ExceptionWrapper.new(env, exception)
log_error(env, wrapper)
if env['action_dispatch.show_detailed_exceptions']
request = Request.new(env)
template = ActionView::Base.new([RESCUES_TEMPLATE_PATH],
request: request,
exception: wrapper.exception,
traces: traces_from_wrapper(wrapper),
routes_inspector: routes_inspector(exception),
source_extract: wrapper.source_extract,
line_number: wrapper.line_number,
file: wrapper.file
)
file = "rescues/#{wrapper.rescue_template}"
if request.xhr?
body = template.render(template: file, layout: false, formats: [:text])
format = "text/plain"
else
body = template.render(template: file, layout: 'rescues/layout')
format = "text/html"
end
render(wrapper.status_code, body, format)
else
raise exception
end
end
def render(status, body, format)
[status, {'Content-Type' => "#{format}; charset=#{Response.default_charset}", 'Content-Length' => body.bytesize.to_s}, [body]]
end
def log_error(env, wrapper)
logger = logger(env)
return unless logger
exception = wrapper.exception
trace = wrapper.application_trace
trace = wrapper.framework_trace if trace.empty?
ActiveSupport::Deprecation.silence do
message = "\n#{exception.class} (#{exception.message}):\n"
message << exception.annoted_source_code.to_s if exception.respond_to?(:annoted_source_code)
message << " " << trace.join("\n ")
logger.fatal("#{message}\n\n")
end
end
def logger(env)
env['action_dispatch.logger'] || stderr_logger
end
def stderr_logger
@stderr_logger ||= ActiveSupport::Logger.new($stderr)
end
def routes_inspector(exception)
if @routes_app.respond_to?(:routes) && (exception.is_a?(ActionController::RoutingError) || exception.is_a?(ActionView::Template::Error))
ActionDispatch::Routing::RoutesInspector.new(@routes_app.routes.routes)
end
end
# Augment the exception traces by providing ids for all unique stack frame
def traces_from_wrapper(wrapper)
application_trace = wrapper.application_trace
framework_trace = wrapper.framework_trace
full_trace = wrapper.full_trace
if application_trace && framework_trace
id_counter = 0
application_trace = application_trace.map do |trace|
prev = id_counter
id_counter += 1
{ id: prev, trace: trace }
end
framework_trace = framework_trace.map do |trace|
prev = id_counter
id_counter += 1
{ id: prev, trace: trace }
end
full_trace = application_trace + framework_trace
end
{
"Application Trace" => application_trace,
"Framework Trace" => framework_trace,
"Full Trace" => full_trace
}
end
end
end
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