class Datadog::Contrib::Rails::ExceptionMiddleware
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.
Public Class Methods
new(app)
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# File lib/ddtrace/contrib/rails/middlewares.rb, line 12 def initialize(app) @app = app end
Public Instance Methods
call(env)
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# File lib/ddtrace/contrib/rails/middlewares.rb, line 16 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 tracer = Datadog.configuration[:rails][:tracer] span = tracer.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[:datadog_rack_request_span].set_error(e) if env[:datadog_rack_request_span] end raise e end