问题
Hi below is the clouformation ,code we have python snippet for lambda function s3 to s3 copy.Here could not able to pass the destination bucket from cloud formation parameters to python snippet as target_bucket = Ref: dstBucket
I am hardcoding now target_bucket = destination1 but i want to pass as Ref value
I have tried different ways did not succeed.
---
AWSTemplateFormatVersion: '2010-09-09'
Description: 'objects from Prod bucket to Dev data bucket '
Parameters:
CustomerName:
Description: Customer Name
Type: String
Default: incoming
ProjectName:
Description: Project Name
Type: String
Default: TEST
ENV:
Description: Environment (dev, prd)
Type: String
Default: dev
srcBucket:
Description: Source Bucket that receives data from outside
Default: source1
Type: String
dstBucket:
Description: Destination Bucket that will receive files
Type: String
Default: destination1
Resources:
LambdaRole:
Type: AWS::IAM::Role
Properties:
AssumeRolePolicyDocument:
Version: '2012-10-17'
Statement:
- Effect: Allow
Principal:
Service:
- lambda.amazonaws.com
- s3.amazonaws.com
Action:
- sts:AssumeRole
Path:
Fn::Sub: "/${ProjectName}/"
Policies:
- PolicyName:
Fn::Sub: "${AWS::StackName}"
PolicyDocument:
Version: '2012-10-17'
Statement:
- Sid: AllowLogging
Effect: Allow
Action:
- logs:CreateLogGroup
- logs:CreateLogStream
- logs:PutLogEvents
Resource: "*"
- Sid: SrcBucketPrivs
Action:
- s3:GetObject
- s3:List*
Resource:
- Fn::Sub: arn:aws:s3:::${srcBucket}/*
- Fn::Sub: arn:aws:s3:::${srcBucket}
Effect: Allow
- Sid: DstBucketPrivs
Action:
- s3:PutObject
- s3:List*
Resource:
- Fn::Sub: arn:aws:s3:::${dstBucket}/*
- Fn::Sub: arn:aws:s3:::${dstBucket}
Effect: Allow
LambdaFunction:
Type: AWS::Lambda::Function
DependsOn: LambdaRole
Properties:
Code:
ZipFile: |
from __future__ import print_function
import os
import json
import boto3
import time
import string
import urllib
print('Loading function')
s3 = boto3.client('s3')
def handler(event, context):
source_bucket = event['Records'][0]['s3']['bucket']['name']
key = event['Records'][0]['s3']['object']['key']
target_bucket = Ref: dstBucket
copy_source = {'Bucket':source_bucket, 'Key':key}
try:
s3.copy_object(Bucket=target_bucket, Key=key, CopySource=copy_source)
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, source_bucket))
raise e
Description: Copies objects from srcBucket to dstBucket based on S3 Event Trigger
FunctionName:
Fn::Sub: "${AWS::StackName}"
Handler: index.handler
MemorySize: 128
Role:
Fn::GetAtt:
- LambdaRole
- Arn
Runtime: python3.6
Timeout: 60
LambdaInvokePermission:
Type: AWS::Lambda::Permission
DependsOn: LambdaFunction
Properties:
FunctionName:
Fn::GetAtt:
- LambdaFunction
- Arn
Action: lambda:InvokeFunction
Principal: s3.amazonaws.com
SourceAccount:
Ref: AWS::AccountId
SourceArn:
Fn::Sub: arn:aws:s3:::${srcBucket}
Hi below is the clouformation ,code we have python snippet for lambda function s3 to s3 copy.Here could not able to pass the destination bucket from cloud formation parameters to python snippet as target_bucket = Ref: dstBucket
I am hardcoding now target_bucket = destination1 but i want to pass as Ref value
I have tried different ways did not succeed.
回答1:
You could use the Environment property on your lambda like
LambdaFunction:
Type: AWS::Lambda::Function
DependsOn: LambdaRole
Properties:
...
Environment:
Variables:
DESTINATION_BUCKET: !Ref dstBucket
Then you can update your code to read the environment variable
target_bucket = os.environ['DESTINATION_BUCKET']
Alternatively, if you really want to use the reference, you can use the !Sub function, like
LambdaFunction:
Type: AWS::Lambda::Function
DependsOn: LambdaRole
Properties:
Code:
ZipFile: !Sub |
...
target_bucket = "${dstBucket}"
...
回答2:
RTM
Also this if you need more context.
LambdaFunction:
Type: AWS::Lambda::Function
DependsOn: LambdaRole
Properties:
...
Environment:
...
来源：https://stackoverflow.com/questions/49503569/lambda-with-cloud-formation-pass-cloud-formation-variable-to-python-code