NoMethodError on TimerDecisionStateMachine

[arkadiyt]

We got a undefined method 'run' for #<AWS::Flow::TimerDecisionStateMachine:0x007fb76b535c58> exception today, originating from state_machines L138:

gems/aws-flow-1.0.8/lib/aws/decider/state_machines.rb:138 · block in <class:DecisionStateMachineBase>
gems/aws-flow-1.0.8/lib/aws/decider/state_machines.rb:75 · call
gems/aws-flow-1.0.8/lib/aws/decider/state_machines.rb:75 · consume
gems/aws-flow-1.0.8/lib/aws/decider/workflow_clock.rb:95 · block (2 levels) in create_timer

It seems that DecisionStateMachineDFA will call the transition function with itself as argument, and then the transition function calls run on it, but it has no such method?

[pmohan6]

Thanks for reporting the issue! We will look into this shortly.

[arkadiyt]

Hey @pmohan6, just wanted to check if there was any update on this?

[pmohan6]

Hey @arkadiyt, unfortunately we don't have an update on this yet. I will let you know when we have a fix out for this.

[pmohan6]

Sorry for the late reply. This seems like it might have been incorrectly ported over from Java Flow. The run method mentioned here is the run method on a Runnable in Java. I'll try to dig in further. Do you happen to have a repro for this?

[arkadiyt]

I don't remember how I ran into it but judging from that line in the backtrace:

add_transitions [
  # ...
  [:created, :cancel, :completed, lambda { |immediate_cancellation_callback| immediate_cancellation_callback.run }],
  # ...
]

it seems like it happens when a timer is created and then canceled before it fires?