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|
# frozen_string_literal: true
require "action_dispatch/http/request"
require "action_dispatch/middleware/exception_wrapper"
require "action_dispatch/routing/inspector"
require "action_view"
require "action_view/base"
module ActionDispatch
# This middleware is responsible for logging exceptions and
# showing a debugging page in case the request is local.
class DebugExceptions
cattr_reader :interceptors, instance_accessor: false, default: []
def self.register_interceptor(object = nil, &block)
interceptor = object || block
interceptors << interceptor
end
def initialize(app, routes_app = nil, response_format = :default, interceptors = self.class.interceptors)
@app = app
@routes_app = routes_app
@response_format = response_format
@interceptors = interceptors
end
def call(env)
request = ActionDispatch::Request.new 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
invoke_interceptors(request, exception)
raise exception unless request.show_exceptions?
render_exception(request, exception)
end
private
def invoke_interceptors(request, exception)
backtrace_cleaner = request.get_header("action_dispatch.backtrace_cleaner")
wrapper = ExceptionWrapper.new(backtrace_cleaner, exception)
@interceptors.each do |interceptor|
interceptor.call(request, exception)
rescue Exception
log_error(request, wrapper)
end
end
def render_exception(request, exception)
backtrace_cleaner = request.get_header("action_dispatch.backtrace_cleaner")
wrapper = ExceptionWrapper.new(backtrace_cleaner, exception)
log_error(request, wrapper)
if request.get_header("action_dispatch.show_detailed_exceptions")
begin
content_type = request.formats.first
rescue Mime::Type::InvalidMimeType
render_for_api_request(Mime[:text], wrapper)
end
if api_request?(content_type)
render_for_api_request(content_type, wrapper)
else
render_for_browser_request(request, wrapper)
end
else
raise exception
end
end
def render_for_browser_request(request, wrapper)
template = create_template(request, wrapper)
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)
end
def render_for_api_request(content_type, wrapper)
body = {
status: wrapper.status_code,
error: Rack::Utils::HTTP_STATUS_CODES.fetch(
wrapper.status_code,
Rack::Utils::HTTP_STATUS_CODES[500]
),
exception: wrapper.exception.inspect,
traces: wrapper.traces
}
to_format = "to_#{content_type.to_sym}"
if content_type && body.respond_to?(to_format)
formatted_body = body.public_send(to_format)
format = content_type
else
formatted_body = body.to_json
format = Mime[:json]
end
render(wrapper.status_code, formatted_body, format)
end
def create_template(request, wrapper)
DebugView.new(
request: request,
exception_wrapper: wrapper,
exception: wrapper.exception,
traces: wrapper.traces,
show_source_idx: wrapper.source_to_show_id,
trace_to_show: wrapper.trace_to_show,
routes_inspector: routes_inspector(wrapper.exception),
source_extracts: wrapper.source_extracts,
line_number: wrapper.line_number,
file: wrapper.file
)
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(request, wrapper)
logger = logger(request)
return unless logger
exception = wrapper.exception
trace = wrapper.exception_trace
ActiveSupport::Deprecation.silence do
message = []
message << " "
message << "#{exception.class} (#{exception.message}):"
message.concat(exception.annotated_source_code) if exception.respond_to?(:annotated_source_code)
message << " "
message.concat(trace)
log_array(logger, message)
end
end
def log_array(logger, array)
if logger.formatter && logger.formatter.respond_to?(:tags_text)
logger.fatal array.join("\n#{logger.formatter.tags_text}")
else
logger.fatal array.join("\n")
end
end
def logger(request)
request.logger || ActionView::Base.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
def api_request?(content_type)
@response_format == :api && !content_type.html?
end
end
end
|
