Day#28 | AWS Lambda Part#3 | Trigger Lambda function using S3 and API gateway |CCIT

Опубликовано: 06 Июнь 2021
на канале: Cloud Computing in Telugu

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AWS Lambda Part#3 | Trigger Lambda function using S3 and API gateway |Cloud Computing In Telugu

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00:00:00 - Channel Introduction
00:00:16 - Class introduction
00:00:50 - Trigger Lambda using S3
00:08:40 - Trigger Lambda using API Gateway

In this video, you will learn how to trigger a lambda function using S3 and API gateway.

/*================ S3copyfile Lambda function code ====================

import boto3

s3 = boto3.resource('s3')
def lambda_handler(event, context):
bucket = event['Records'][0]['s3']['bucket']['name']
key = event['Records'][0]['s3']['object']['key']
copy_source = {
'Bucket': bucket,
'Key': key
}
try:
destbucket = s3.Bucket('s3writedata')
destbucket.copy(copy_source, key)
print('{} transferred to destination bucket'.format(key))

except Exception as e:
print(e)
print('Error getting object {} from bucket {}. '.format(key, bucket))
raise e

================ Getpresignedurl Lambda function code ====================

import logging
import boto3
from botocore.exceptions import ClientError
import json

def create_presigned_url(bucket_name, object_name, expiration):
"""Generate a presigned URL to share an S3 object

:param bucket_name: string
:param object_name: string
:param expiration: Time in seconds for the presigned URL to remain valid
:return: Presigned URL as string. If error, returns None.
"""

Generate a presigned URL for the S3 object
s3_client = boto3.client('s3')
try:
response = s3_client.generate_presigned_url('get_object',
Params={'Bucket': bucket_name,
'Key': object_name},
ExpiresIn=int(expiration))
except ClientError as e:
logging.error(e)
return None

The response contains the presigned URL
return response

def lambda_handler(event, context):
logging.info(f"Recieved Event: {json.dumps(event, indent=4)}")
event_body = json.loads(event.get("body", json.dumps({})))

bucket_name = event_body.get("bucket_name")
object_name = event_body.get("object_name")
expiration_time = event_body.get("expiration_time", 3600)

if not bucket_name or not object_name:
response = {
"error_message":"bucket_name, object_name fields are must in body and expiration_time is optional."
}
else:
pre_signed_url = create_presigned_url(bucket_name, object_name, expiration_time)

response = {
"pre_signed_url":pre_signed_url,
"valid_for": f"next {expiration_time} seconds",
"bucket_name": bucket_name,
"object_name": object_name
}

return {
"statusCode":200,
"headers":{"Access-Control-Allow-Origin": "*"},
"body": json.dumps(response)
}
*/

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