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James Prendergast
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Change the lab to be self-paced
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-363
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‎Makefile

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TAGS:="purpose=lab project=lambda-edge-ab"
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EDGE_STACK = lambda-edge-dist
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# ORIGIN_STACK = lambda-edge-origins
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CLOUDFRONT_TEMPLATE = cloudfront-template.yml
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# ORIGIN_TEMPLATE = ../content/origin-template.yml
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# OAI:=$(shell aws cloudformation describe-stacks --stack-name $(EDGE_STACK) --region us-east-1 --query 'Stacks[0].Outputs[?OutputKey==`OaiS3CanonicalUserId`].OutputValue[]' --output text)
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# RAND:=$$RANDOM
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# include rand.mk
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# ORIGIN_A:=ab-test-a-$(RAND)
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# ORIGIN_B:=ab-test-b-$(RAND)
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# DISTROBUCKET:=aws-sam-cli-managed-default-samclisourcebucket-$(RAND)
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# DISTRIBUTION_ID:=$(shell aws cloudformation describe-stacks --stack-name $(EDGE_STACK) --region us-east-1 --query 'Stacks[0].Outputs[?OutputKey==`DistributionID`].OutputValue[]' --output text)
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.PHONY: deploy-clicktracker upload-origin upload-index invalidate-cache clean package deploy-distribution deploy-origins teardown-origins setup reset
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# rand.mk:
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# @echo "RAND:=$$RANDOM" > rand.mk
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# test:
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# @echo $(RAND)
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upload-index:
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aws s3api put-object --bucket $(ORIGIN_A) --content-type text/html --cache-control max-age=60 --key index.html --body ./content/origin-a/index.html
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aws s3api put-object --bucket $(ORIGIN_B) --content-type text/html --cache-control max-age=60 --key index.html --body ./content/origin-b/index.html
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# invalidate-cache:
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# aws cloudfront create-invalidation --distribution-id $(DISTRIBUTION_ID) --paths "/*"
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# distrobucket:
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# aws s3api create-bucket --bucket $(DISTROBUCKET) --acl private --region us-east-1
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# aws s3api put-bucket-policy --bucket $(DISTROBUCKET) --policy '{ "Version": "2008-10-17", "Statement": [ { "Effect": "Allow", "Principal": { "Service": "serverlessrepo.amazonaws.com" }, "Action": "s3:GetObject", "Resource": "arn:aws:s3:::$(DISTROBUCKET)/*" } ] }'
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deploy:
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sam deploy --template-file $(CLOUDFRONT_TEMPLATE) --tags $(TAGS) --stack-name $(EDGE_STACK) -g
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# deploy-origins:
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# sam deploy --template-file $(ORIGIN_TEMPLATE) --tags $(TAGS) --stack-name $(ORIGIN_STACK) --parameter-overrides "OriginAccessIdentity=$(OAI) OriginA=$(ORIGIN_A).s3.ap-southeast-2.amazonaws.com OriginB=$(ORIGIN_B).s3.ap-southeast-2.amazonaws.com"
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# ../edge-functions/src/origins_config.js:
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# @echo "module.exports = {\n a:'$(ORIGIN_A)',\n b:'$(ORIGIN_B)'\n};\n" > $@
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teardown-origins:
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aws s3 rb s3://$(ORIGIN_A) --force
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aws s3 rb s3://$(ORIGIN_B) --force
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aws cloudformation wait stack-delete-complete --stack-name $(ORIGIN_STACK)
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setup: deploy-distribution
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@echo "LAB SET UP"
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reset: teardown-origins invalidate-cache
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@echo "LAB RESET"

‎README.md

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‎cloudfront-template.yml

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AWSTemplateFormatVersion: '2010-09-09'
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Transform: AWS::Serverless-2016-10-31
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Description: A/B testing using cloudfront and lambda@edge
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Resources:
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OriginAccessIdentity:
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Type: AWS::CloudFront::CloudFrontOriginAccessIdentity
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Properties:
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CloudFrontOriginAccessIdentityConfig:
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Comment: Origin Access Identity for lambda@edge dev lab
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LogBucket:
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Type: "AWS::S3::Bucket"
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CFDistribution:
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Type: AWS::CloudFront::Distribution
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Properties:
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DistributionConfig:
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Logging:
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Bucket: !GetAtt LogBucket.DomainName
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IncludeCookies: true
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Enabled: true
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DefaultRootObject: index.html
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Comment: 'AB testing Cloudfront distribution'
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Origins:
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- Id: s3
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DomainName: !GetAtt OriginABucket.DomainName
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S3OriginConfig:
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OriginAccessIdentity: !Join [ "/", [ origin-access-identity, cloudfront, !Ref OriginAccessIdentity ]]
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DefaultCacheBehavior:
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TargetOriginId: s3
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ForwardedValues:
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QueryString: false
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Cookies:
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Forward: whitelist
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WhitelistedNames:
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- pool
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ViewerProtocolPolicy: redirect-to-https
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DefaultTTL: 30
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MinTTL: 0
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AllowedMethods:
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- HEAD
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- GET
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CachedMethods:
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- HEAD
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- GET
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SmoothStreaming: false
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Compress: true
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OriginABucket:
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Type: AWS::S3::Bucket
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Properties:
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BucketName: !Join
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- "-"
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- - "ab-testing-origin-a"
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- !Select
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- 0
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- !Split
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- "-"
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- !Select
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- 2
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- !Split
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- "/"
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- !Ref "AWS::StackId"
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AccessControl: Private
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Tags:
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- Key: purpose
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Value: lab
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- Key: project
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Value: lambda-edge-ab
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OriginBBucket:
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Type: AWS::S3::Bucket
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Properties:
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BucketName: !Join
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- "-"
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- - "ab-testing-origin-b"
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- !Select
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- 0
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- !Split
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- "-"
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- !Select
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- 2
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- !Split
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- "/"
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- !Ref "AWS::StackId"
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AccessControl: Private
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Tags:
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- Key: purpose
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Value: lab
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- Key: project
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Value: lambda-edge-ab
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OriginAAccessBucketPolicy:
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Type: AWS::S3::BucketPolicy
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Properties:
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Bucket:
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Ref: OriginABucket
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PolicyDocument:
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Version: '2008-10-17'
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Id: PolicyForCloudFrontPrivateContentA
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Statement:
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- Sid: '1'
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Effect: Allow
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Principal:
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CanonicalUser: !GetAtt OriginAccessIdentity.S3CanonicalUserId
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Action: s3:GetObject
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Resource:
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- !Join [ "", [ "arn:aws:s3:::", !Ref OriginABucket, "/*"]]
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OriginBAccessBucketPolicy:
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Type: AWS::S3::BucketPolicy
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Properties:
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Bucket:
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Ref: OriginBBucket
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PolicyDocument:
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Version: '2008-10-17'
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Id: PolicyForCloudFrontPrivateContentA
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Statement:
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- Sid: '1'
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Effect: Allow
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Principal:
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CanonicalUser: !GetAtt OriginAccessIdentity.S3CanonicalUserId
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Action: s3:GetObject
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Resource:
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- !Join [ "", [ "arn:aws:s3:::", !Ref OriginBBucket, "/*"]]
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Outputs:
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CFDistribution:
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Description: Cloudfront Distribution Domain Name
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Value: !GetAtt CFDistribution.DomainName
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DistributionID:
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Description: Cloudfront Distribution ID
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Value: !Ref CFDistribution
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BucketADomain:
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Description: Regional Domian name of the A bucket
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Value: !GetAtt OriginABucket.RegionalDomainName
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BucketBDomain:
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Description: Regional Domian name of the A bucket
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Value: !GetAtt OriginBBucket.RegionalDomainName
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LogBucketDomain:
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Description: Regional Domian name of the log bucket
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Value: !GetAtt LogBucket.RegionalDomainName

‎edge-functions/src/common.js

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exports.parseCookies = (headers) => {
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const parsedCookie = {};
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if (headers.cookie) {
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headers.cookie[0].value.split(';').forEach((cookie) => {
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if (cookie) {
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const parts = cookie.split('=');
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parsedCookie[parts[0].trim()] = parts[1].trim();
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}
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});
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}
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return parsedCookie;
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};

‎edge-functions/src/originrequest.js

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// the S3 origins that correspond to content for Pool A and Pool B
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const origins = require('./origins_config.js');
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const parseCookies = require('./common.js').parseCookies;
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// the `pool` cookie determines which origin to route to
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const cookieName = 'pool';
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const parseCookies = (headers) => {
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const parsedCookie = {};
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if (headers.cookie) {
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headers.cookie[0].value.split(';').forEach((cookie) => {
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if (cookie) {
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const parts = cookie.split('=');
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parsedCookie[parts[0].trim()] = parts[1].trim();
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}
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});
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}
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return parsedCookie;
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}
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// changes request origin depending on value of the `pool` cookie
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exports.handler = (event, context, callback) => {
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const request = event.Records[0].cf.request;

‎edge-functions/src/originresponse.js

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'use strict';
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// the S3 origins that correspond to content for Pool A and Pool B
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const origins = require('./origins_config.js');
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const originconfig = require('./origins_config.js');
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const origins = originconfig.origins;
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//returns a set-cookie header based on where the content was served from
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exports.handler = (event, context, callback) => {

‎edge-functions/src/viewerrequest.js

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const cookieName = 'pool';
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//returns cookies as an associative array, given a CloudFront request headers array
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const parseCookies = (headers) => {
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const parsedCookie = {};
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if (headers.cookie) {
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headers.cookie[0].value.split(';').forEach((cookie) => {
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if (cookie) {
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const parts = cookie.split('=');
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parsedCookie[parts[0].trim()] = parts[1].trim();
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}
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});
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}
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return parsedCookie;
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}
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const parseCookies = require('./common.js').parseCookies;
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// returns either 'a' or 'b', with a default probability of 1:1
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const choosePool = (chance = 2) => Math.floor(Math.random()*chance) === 0 ? 'b' : 'a';

‎resources/access_denied.png

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‎resources/cloudformation-lambda-dist-output.png

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‎resources/origin-a-bucket-empty.png

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‎resources/s3_origin_bucketslist.png

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‎resources/uploaded-content-origin-a.png

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‎samconfig.toml

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version = 0.1
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[default]
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[default.deploy]
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[default.deploy.parameters]
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stack_name = "lambda-edge-dist2"
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s3_bucket = "aws-sam-cli-managed-default-samclisourcebucket-1882ei3cfmxkc"
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s3_prefix = "lambda-edge-dist2"
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region = "us-east-1"
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capabilities = "CAPABILITY_IAM"
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‎setup/Makefile

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