CODEWITHSUNDEEP
pythonamazon-web-servicesamazon-s3lambdaamazon-iam
Red
Red

Reputation: 45

AWS Lambda Python S3 Read File Error

Trying to read a file from a bucket in s3. The bucket has a trigger wired to a python lambda function. This then runs when a new file is put in the bucket. I keep getting an error.

This the code:

Download the file from S3 to the local filesystem

try:
    s3.meta.client.download_file(bucket, key, localFilename)
except Exception as e:
    print(e)
    print('Error getting object {} from bucket {}. Make sure they exist and your bucket is in the same region as this function.'.format(key, bucket))
    raise e

I get this error

'ClientMeta' object has no attribute 'client'

I am thinking it could be the IAM but the Lambda function has the AWSLambdaFullAccess Role which is pretty much an admin in S3.

Any help would be much appreciated

Upvotes: 2

Views: 3507

Answers (2)

John Hanley
John Hanley

Reputation: 81454

This error is caused by creating a boto3 client instead of resource.

Example (this will reproduce your error):

s3 = boto3.client('s3')
s3.meta.client.download_file(bucket, key, localFilename)

You have two solutions:

1) Change to use the "high-level abstracted" s3 resource:

s3 = boto3.resource('s3')
s3.meta.client.download_file(bucket, key, localFilename)

2) Directly use the "low-level" s3 client download_file()

s3 = boto3.client('s3')
s3.download_file(bucket, key, localFilename)

Working with Boto3 Low-Level Clients

Upvotes: 3

socrates
socrates

Reputation: 1321

I think may be refer incorrectly object type for variable s3. s3.meta.client may be something you use when s3 is ResourceMeta object, but here I think s3 is Client object.

So you can just write

try: s3.download_file(bucket, key, localFilename) except Exception as e: ...

Upvotes: 0

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