Test AWS lambda function via cli

Question

I want to test a lambda function via CLI instead of the AWS Management console. (Looking to automate function testing by making a bash script)

I've read the documentation: http://docs.aws.amazon.com/cli/latest/reference/lambda/invoke.html

I am trying to invoke the lambda function with a json event payload. My bashcode looks like this:

#!/bin/bash

name="arn:aws:lambda:euwest1:100000000000:function:foo"
invoketype="Event"
payload="{'account':'100261334439', 'region':'eu-west-1', 'detail-type':'Scheduled Event', 'source':'aws.events', 'time':'2017-07-16T03:00:00Z', 'id':'178710aa-6871-11e7-b6ef-e9b95183cfc9', 'resources':['arn:aws:events:eu-west-1:100000000000:rule/run_everyday']}"

aws lambda invoke --function-name "$name" --invocation-type "$invoketype" --payload "$payload" testresult.log

I am getting the error:

An error occurred (InvalidRequestContentException) when calling the Invoke operation: Could not parse request body into json: Unexpected character ('a'
(code 97)): was expecting double-quote to start field name at [Source: [B@7ac4c2fa; line: 1, column: 3]

I believe I am providing the payload in wrong format, but the documentation has no example, it just says that the datatype is 'blob'. I did some searching but only found info on BLOB (binary large object), but I'm pretty sure this is not what the documentation is referring to.

I have tried without the outer double quotes and replacing all the single quotes with double quotes, but all of these give the same error.

Geek Stocks · Accepted Answer · 2019-01-11 09:59:02Z

4

tl;dr

Correct (normally): $ aws lambda invoke --function-name myFunction --payload '{"key1":"value1"}' outputfile.txt

Correct (Windows): aws lambda invoke --function-name myFunction --payload "{""key1"": ""value1""}" outputfile.txt

OP's specific question is already answered correctly; this answer is for the benefit of those ending up here with slightly different circumstances from OP. What OS are you using? If its Windows, then you are likely pulling your hair out over single and double quote issues.

Windows command line does not understand single quotes, and double quotes within a quoted string must be escaped as two double quotes ("").

Credit (normal): AWS documentation

Credit (Windows): Hail Reddit!

answered Jan 11, 2019 at 9:59

Geek Stocks

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1 Comment

Douglas Figueroa Over a year ago

This is the correct answer for Windows users, i had tried the documentation example but this works!

Frederic Henri · Accepted Answer · 2017-08-01 13:36:23Z

2

valid JSon should have key and value between double quotes

so you should have the payload attribute written as

payload='{"account":"100261334439", "region":"eu-west-1", "detail-type":"Scheduled Event", "source":"aws.events", "time":"2017-07-16T03:00:00Z", "id":"178710aa-6871-11e7-b6ef-e9b95183cfc9", "resources":["arn:aws:events:eu-west-1:100000000000:rule/run_everyday"]}'

answered Aug 1, 2017 at 13:36

Frederic Henri

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