Using lambda environment variable to pass parameters to cloudwatch api

Question

I am using environment variables in Lambda to collect list of alarm names, then pass it to the AlarmNames field in Cloudwatch API cloudwatch.describe_alarms(AlarmNames=[])

Keep having error in type, the type that is accepted by the API is list and tuple.

env = os.environ['ALARM_NAMES']
response = cloudwatch.describe_alarms(
    AlarmNames= env
)

this are the environment variables field for ALARM_NAMES: 'instance1-freediskspace C','instance2-freediskspace C','instance3-freediskspace C'

How is ALARM_NAMES being set? Can you print the env here and update the question with an example value? — Dejan Peretin
– Dejan Peretin, Commented Aug 21, 2019 at 7:55

hurlenko · Accepted Answer · 2019-08-21 06:53:08Z

4

Environment variables are strings. To get a tuple or a list you can split the string by some separator:

"mystring1;mystring2".split(";")  # -> ['mystring1', 'mystring2']

answered Aug 21, 2019 at 6:53

hurlenko

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1 Comment

user2155404 Over a year ago

the function able to run without errors, but the describe_alarms failed to return any results, this means that none of the env variables were passed into the argument list

Dejan Peretin · Accepted Answer · 2019-08-21 11:09:14Z

1

If this is the value of env:

"'instance1-freediskspace C','instance2-freediskspace C','instance3-freediskspace C'"

you need to remove the single quotes and split by the comma to get the list. Like this for example:

AlarmNames= env.replace("'", "").split(',')

answered Aug 21, 2019 at 11:09

Dejan Peretin

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