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Contents
# frozen_string_literal: true
require_relative '../action_pack/utils'
module Datadog
module Tracing
module Contrib
# Rails module includes middlewares that are required for Rails to be properly instrumented.
module Rails
# This is only here to catch errors, the Rack module does something very similar, however,
# since it's not in the same place in the stack, when the Rack middleware is called,
# error is already swallowed and handled by Rails so we miss the call stack, for instance.
class ExceptionMiddleware
def initialize(app)
@app = app
end
def call(env)
@app.call(env)
# rubocop:disable Lint/RescueException
# Here we really want to catch *any* exception, not only StandardError,
# as we really have no clue of what is in the block,
# and it is user code which should be executed no matter what.
# It's not a problem since we re-raise it afterwards so for example a
# SignalException::Interrupt would still bubble up.
rescue Exception => e
span = Tracing.active_span
if !span.nil? && ActionPack::Utils.exception_is_error?(e)
# Only set error if it's supposed to be flagged as such
# e.g. we don't want to flag 404s.
# You can add custom errors via `config.action_dispatch.rescue_responses`
span.set_error(e)
# Some exception gets handled by Rails middleware before it can be set on Rack middleware
# The rack span is the root span of the request and should make sure it has the full exception
# set on it.
env[Contrib::Rack::Ext::RACK_ENV_REQUEST_SPAN].set_error(e) if env[Contrib::Rack::Ext::RACK_ENV_REQUEST_SPAN]
end
raise e
end
# rubocop:enable Lint/RescueException
end
end
end
end
end
Version data entries
40 entries across 40 versions & 2 rubygems