CloudWatch Logs in Python Lambda function

Question

I want to put the entry in dynamo-db table,as soon as i put object in S3 file. I have set the triggers for the same.

I have written simple below lambada code to check the response

def lambda_handler(event, context):
    print(str(event))

When i am checking in CLoudWatchLogs i can see below.

{'Records': [{'eventVersion': '2.1', 'eventSource': 'aws:s3', 
'awsRegion': 'us-east-1', 'eventTime': '2019-02-20T15:58:48.057Z', 
'eventName': 'ObjectCreated:Put', 'userIdentity': {'principalId': 
'AHRO8PUVZ6HA1'}, 'requestParameters': {'sourceIPAddress': 
'106.193.192.255'}, 'responseElements': {'x-amz-request-id': 
'218359C00133F5A3', 'x-amz-id-2': 
 'ZcA26gyzVOaaG+O1AgbZl6UTGjdqxvz0THfeyGepwPwkn8No2m+
 2jCm/zHvMGH1igrATG1pAnQI='}, 's3': {'s3SchemaVersion': '1.0', 
'configurationId': 'd4eeba8b-3cab-43d2-835a-2d6fed343144', 'bucket': 
 {'name': 'trus-bucket-291902', 'ownerIdentity': {'principalId': 
 'AHRO8PUVZ6HA1'}, 'arn': 'arn:aws:s3:::trus-bucket-291902'}, 'object': 
 {'key': 'Linux-admin-Lecture-14.pdf', 'size': 113847, 'eTag': 
'a8b3f353134bfaf7e876e05b439c7632', 'sequencer': '005C6D7937E630A6EB'}}}]}

Can you help me fetch the object name(Linux-admin-Lecture-14.pdf) and size (113847) from above string?

Please format your code sample to look more readable

Marjeta
– Marjeta

2019-02-20 16:34:08 +00:00
Commented Feb 20, 2019 at 16:34 — Marjeta
– Marjeta, Commented Feb 20, 2019 at 16:34

Pasi · Accepted Answer · 2019-02-20 16:30:21Z

1

The event is a normal Python dictionary, so it's accessed the usual way

key = event['Records'][0]['s3']['object']['key']

answered Feb 20, 2019 at 16:30

Pasi

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2 Comments

AWS_Beginner Over a year ago

Thanks Pasi.I appreciate if you can explain me how you arrive to this so that next time i can do by my own.

Deiv Over a year ago

You can look up tutorials explaining python dictionaries, for example: w3schools.com/python/python_dictionaries.asp You can also go to a Json viewer website that can nicely format it, so that you can see which keys to use to access it (for ex jsonviewer.stack.hu paste your code and hit "format")

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