How to get the name of component at which stepfunction has failed

user_17668646 0
Viewed 44

I have list of executionArn of stepfunction execution, I am filtering those executionArn by status == 'FAILED'.

Now, how can I get the exact failure of the stepfunction in Python, (meaning: at which point the execution has failed)?

jmespath aws-step-functions boto3 amazon-web-services
2 Answers

You can do something like this:

import boto3
import jmespath

client = boto3.client('stepfunctions')


full_result = (
    client
    .get_paginator('get_execution_history')
    .paginate(arn=<your arn>)
    .build_full_result()
)

exn_failed_event = jmespath.search('events[?type==`ExecutionFailed`]', full_result)

The exn_failed_event dictionary will look something like this

[
  {
    'executionFailedEventDetails': {
         'cause': 
           'An error occurred while executing '
           "the state 'Lambda Invoke' (entered "
           'at the event id #4). Invalid path '
           "'$.foo' : No results for path: "
           "$['foo']",
         'error': 'States.Runtime'
    },
    'id': 11,
    'previousEventId': 0,
    'timestamp': datetime.datetime(2022, 7, 11, 19, 0, 24, 2000, tzinfo=tzlocal()),
    'type': 'ExecutionFailed'
  }
]
user_45260190

Based on this issue in boto3 repository, it looks like there is a search method that you can call on an iterator object.

So your actual code could be simplified — and gather less unneeded data — to:

import boto3

failed_events = boto3.client('stepfunctions')
  .get_paginator('get_execution_history')
  .paginate(arn=<your arn>)
  .search('events[?type==`ExecutionFailed`]')
user_21235300
Related