aws-samples / serverless-patterns
Duplication

Places in code with 6 or more lines that are exactly the same.

Intro
  • For duplication, we look at places in code where there are 6 or more lines of code that are exactly the same.
  • Before duplication is calculated, the code is cleaned to remove empty lines, comments, and frequently duplicated constructs such as imports.
  • You should aim at having as little as possible (<5%) of duplicated code as high-level of duplication can lead to maintenance difficulties, poor factoring, and logical contradictions.
Learn more...
Duplication Overall
  • 25% duplication:
    • 16,048 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
    • 4,047 duplicated lines
  • 750 duplicates
system25% (4,047 lines)
Duplication per Extension
yaml25% (1,684 lines)
ts27% (1,014 lines)
js30% (441 lines)
yml23% (419 lines)
py17% (391 lines)
graphql42% (98 lines)
Duplication per Component (primary)
eventbridge-api-destinations47% (210 lines)
cognito-restapi-vpclink23% (167 lines)
apigw-lambda-qldb47% (155 lines)
appsync-notify-subscribers-of-database-updates23% (115 lines)
cdk-eventbridge-appsync93% (108 lines)
cdk-eventbridge-appsync-oauth43% (105 lines)
apigw-vpclink-pvt-alb50% (101 lines)
apig-waf53% (100 lines)
private-apigw-lambda-cdk63% (90 lines)
apigw-s3-cdk49% (90 lines)
fargate-sns-sqs-cdk52% (86 lines)
fargate-sqs-cdk66% (73 lines)
apigw-to-private-apig-cdk45% (67 lines)
cognito-httpapi50% (67 lines)
appsync-dynamodb-singletable38% (67 lines)
s3-sqs-lambda47% (57 lines)
apigw-rest-api-batch-sam25% (54 lines)
s3-lambda60% (51 lines)
apigw-rest-api-eventbridge-sam51% (48 lines)
apigw-rest-apigw-rest30% (48 lines)
apigw-http-api-lambda64% (48 lines)
apigw-mutualtls-lambda42% (48 lines)
eventbridge-cross-region26% (46 lines)
sfn-log-export16% (45 lines)
fargate-sns-cdk57% (45 lines)
apigw-sfn49% (44 lines)
sfn-sfn41% (43 lines)
cdk-lambda-appsync37% (42 lines)
fargate-eventbridge-cdk48% (41 lines)
sfn-callback-cdk48% (41 lines)
apigw-rest-stepfunction41% (40 lines)
sqs-lambda-cdk-python72% (40 lines)
sqs-lambda-eb-cdk-python29% (40 lines)
appsync-dynamodb-singletable-cdk34% (39 lines)
dynamodb-streams-lambda-event-filters44% (38 lines)
apigw-canary-deployment-cdk27% (37 lines)
fargate-s3-cdk29% (37 lines)
sfn-apigw45% (36 lines)
fargate-sfn-cdk31% (35 lines)
apigw-http-api-lambda-rds-proxy-cdk16% (34 lines)
sfn-lambda54% (34 lines)
cdk-cloudfront-to-s3-and-lambda13% (33 lines)
apigw-websocket-api-sqs-lambda15% (32 lines)
lambda-sns-sms-cdk34% (31 lines)
appsync-direct-lambda-resolver28% (31 lines)
s3-eventbridge25% (31 lines)
appsync-dynamodb18% (31 lines)
sfn-inside-sfn-cdk-python50% (30 lines)
apigw-sqs-lambda23% (28 lines)
apigw-websocket-api-lambda9% (27 lines)
apigw-http-api-lambda-cdk37% (25 lines)
fargate-dynamodb-cdk30% (25 lines)
eventbridge-sqs62% (25 lines)
lambda-rekognition22% (25 lines)
fargate-aurora-serverless-cdk25% (25 lines)
apigw-iam39% (25 lines)
lambda-sfn35% (24 lines)
kinesis-lambda71% (23 lines)
kinesis-lambda-efo62% (23 lines)
lambda-sns-sms45% (23 lines)
apigw-waf-sam19% (23 lines)
sqs-lambda61% (22 lines)
lambda-sns55% (22 lines)
apigw-http-api-lambda-rds-proxy5% (22 lines)
dynamodb-eventbridge16% (22 lines)
lambda-dynamodb-cdk47% (22 lines)
sfn-s343% (21 lines)
sfn-eventbridge31% (21 lines)
cdk-vpc-lambda-sfn13% (21 lines)
eventbridge-sns54% (20 lines)
sfn-glue-sam12% (20 lines)
apigw-lambda-cdk50% (19 lines)
lambda-sns-cdk34% (18 lines)
sns-lambda-cdk48% (18 lines)
lambda-sqs42% (18 lines)
sns-sqs-cdk32% (17 lines)
sfn-sqs-cdk25% (15 lines)
lambda-efs-cdk17% (15 lines)
sfn-dynamodb-cdk19% (15 lines)
ta-eventbridge-lambda-s38% (15 lines)
amplify_cognito_apigateway_lambda_envvariables7% (15 lines)
codecommit-s38% (15 lines)
sfn-dynamodb19% (15 lines)
sfn-sqs30% (15 lines)
lambda-s3-sfn10% (14 lines)
apigw-http-api-eventbridge17% (13 lines)
sfn-sns23% (13 lines)
sns-lambda35% (13 lines)
lambda-dynamodb24% (13 lines)
s3-sqs31% (12 lines)
dynamodb-lambda32% (12 lines)
apigw-lambda-observability4% (12 lines)
s3-eventbridge-direct20% (12 lines)
dynamodb-kinesis50% (11 lines)
eventbridge-sqs-cdk34% (11 lines)
eventbridge-cloudwatch-cdk32% (11 lines)
cdk-appsync-sns17% (10 lines)
cdk-appsync-sqs16% (10 lines)
eventbridge-sns-cdk33% (10 lines)
apigw-eventbridge8% (10 lines)
lambda-ses14% (9 lines)
iot-lambda-cdk15% (8 lines)
eventbridge-lambda-cdk20% (8 lines)
dynamodb-lambda-cdk24% (7 lines)
fargate-cdk17% (7 lines)
apigw-fargate-cdk10% (7 lines)
cdk-codecommit-codepipeline-sfn-athena-glue3% (7 lines)
auroraserverless-secretsmanager12% (7 lines)
s3-lambda-cdk21% (7 lines)
dynamodb-kinesis-cdk35% (7 lines)
eventbridge-scheduled-lambda-cdk-typescript18% (7 lines)
sqs-lambda-cdk15% (7 lines)
apigw-rest-api-dynamodb4% (7 lines)
lambda-ssm-parameter8% (7 lines)
cfn-custom-resource-s3-create4% (7 lines)
msk-lambda16% (7 lines)
msk-lambda-cdk15% (7 lines)
appsync-eventbridge12% (7 lines)
appsync-express-workflow6% (7 lines)
s3-sns16% (6 lines)
sns-sqs13% (6 lines)
eventbridge-scheduled-lambda31% (6 lines)
lambda-s320% (6 lines)
eventbridge-lambda20% (6 lines)
iot-mqttoverhttp-customauth4% (6 lines)
cdk-eventbridge-stepfunction6% (6 lines)
lambda-aurora-serverless3% (6 lines)
eventbridge-cloudwatch0% (0 lines)
apigw-lambda-dynamodb-cdk0% (0 lines)
parallel-e2e-pipeline-cdk0% (0 lines)
iot-lambda0% (0 lines)
s3-sqs-cdk0% (0 lines)
lambda-eventbridge0% (0 lines)
lambda-sqs-cdk0% (0 lines)
rabbitmq-lambda0% (0 lines)
apigw-sns-sqs-lambda-cdk0% (0 lines)
apigw-http-api-eventbridge-dotnet-cdk0% (0 lines)
aurora-serverless-s3-ingestion0% (0 lines)
sfn-comprehend-sdk0% (0 lines)
lambda-cloudwatch-cdk0% (0 lines)
cloudfront-cff-s3-cdk-python0% (0 lines)
xray-lambdalayers-cdk-python0% (0 lines)
_pattern-model0% (0 lines)
eventbridge-sfn0% (0 lines)
lambda-cloudwatch0% (0 lines)
apigw-lambda-dynamodb0% (0 lines)
fargate-secretsmanager0% (0 lines)
lambda-pinpoint0% (0 lines)
apigw-http-api-eventbridge-cdk0% (0 lines)
sqs-lambda-dynamodb-cdk0% (0 lines)
sfn-glue-sync-cdk0% (0 lines)
s3-object-lambda0% (0 lines)
lambda0% (0 lines)
lambda-lambda0% (0 lines)
cloudfront-lambda-edge-cdk-python0% (0 lines)
systems-manager-automation-to-lambda0% (0 lines)
apigw-rest-api-dynamodb-cdk0% (0 lines)

Duplication Between Components (50+ lines)

G cdk-eventbridge-appsync-oauth cdk-eventbridge-appsync-oauth cdk-eventbridge-appsync cdk-eventbridge-appsync cdk-eventbridge-appsync-oauth--cdk-eventbridge-appsync 210 cdk-lambda-appsync cdk-lambda-appsync cdk-eventbridge-appsync-oauth--cdk-lambda-appsync 66 cdk-eventbridge-appsync--cdk-lambda-appsync 84 apigw-vpclink-pvt-alb apigw-vpclink-pvt-alb cognito-restapi-vpclink cognito-restapi-vpclink apigw-vpclink-pvt-alb--cognito-restapi-vpclink 202 fargate-sns-sqs-cdk fargate-sns-sqs-cdk fargate-sqs-cdk fargate-sqs-cdk fargate-sns-sqs-cdk--fargate-sqs-cdk 151 apigw-to-private-apig-cdk apigw-to-private-apig-cdk private-apigw-lambda-cdk private-apigw-lambda-cdk apigw-to-private-apig-cdk--private-apigw-lambda-cdk 134 appsync-notify-subscribers-of-database-updates appsync-notify-subscribers-of-database-updates cognito-httpapi cognito-httpapi appsync-notify-subscribers-of-database-updates--cognito-httpapi 120 s3-lambda s3-lambda s3-sqs-lambda s3-sqs-lambda s3-lambda--s3-sqs-lambda 102 fargate-sns-cdk fargate-sns-cdk fargate-sns-cdk--fargate-sns-sqs-cdk 99 fargate-sns-cdk--fargate-sqs-cdk 76 apigw-http-api-lambda apigw-http-api-lambda apigw-mutualtls-lambda apigw-mutualtls-lambda apigw-http-api-lambda--apigw-mutualtls-lambda 96 apigw-rest-api-batch-sam apigw-rest-api-batch-sam apigw-rest-api-eventbridge-sam apigw-rest-api-eventbridge-sam apigw-rest-api-batch-sam--apigw-rest-api-eventbridge-sam 94 apigw-rest-stepfunction apigw-rest-stepfunction apigw-rest-api-batch-sam--apigw-rest-stepfunction 78 apigw-rest-api-eventbridge-sam--apigw-rest-stepfunction 80 apig-waf apig-waf apig-waf--private-apigw-lambda-cdk 84 fargate-eventbridge-cdk fargate-eventbridge-cdk fargate-eventbridge-cdk--fargate-sns-sqs-cdk 81 fargate-eventbridge-cdk--fargate-sqs-cdk 76 fargate-eventbridge-cdk--fargate-sns-cdk 76 fargate-sfn-cdk fargate-sfn-cdk fargate-eventbridge-cdk--fargate-sfn-cdk 70 sfn-callback-cdk sfn-callback-cdk sqs-lambda-cdk-python sqs-lambda-cdk-python sfn-callback-cdk--sqs-lambda-cdk-python 80 sqs-lambda-eb-cdk-python sqs-lambda-eb-cdk-python sfn-callback-cdk--sqs-lambda-eb-cdk-python 80 sqs-lambda-cdk-python--sqs-lambda-eb-cdk-python 78 fargate-sfn-cdk--fargate-sns-sqs-cdk 69 fargate-sfn-cdk--fargate-sqs-cdk 64 fargate-sfn-cdk--fargate-sns-cdk 64 sfn-apigw sfn-apigw sfn-sfn sfn-sfn sfn-apigw--sfn-sfn 65 sfn-lambda sfn-lambda sfn-apigw--sfn-lambda 52 eventbridge-api-destinations eventbridge-api-destinations sfn-log-export sfn-log-export eventbridge-api-destinations--sfn-log-export 63 appsync-dynamodb-singletable appsync-dynamodb-singletable appsync-dynamodb appsync-dynamodb appsync-dynamodb-singletable--appsync-dynamodb 62 appsync-direct-lambda-resolver appsync-direct-lambda-resolver appsync-direct-lambda-resolver--cdk-eventbridge-appsync 50 appsync-direct-lambda-resolver--cdk-lambda-appsync 50 apigw-canary-deployment-cdk apigw-canary-deployment-cdk apigw-http-api-lambda-cdk apigw-http-api-lambda-cdk apigw-canary-deployment-cdk--apigw-http-api-lambda-cdk 50 fargate-aurora-serverless-cdk fargate-aurora-serverless-cdk fargate-aurora-serverless-cdk--fargate-sqs-cdk 50 fargate-aurora-serverless-cdk--fargate-sns-cdk 50 fargate-aurora-serverless-cdk--fargate-eventbridge-cdk 50 fargate-aurora-serverless-cdk--fargate-sfn-cdk 50

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Show more details on duplication between components...
Longest Duplicates
The list of 20 longest duplicates.
See data for all 750 duplicates...
Size#FoldersFilesLinesCode
54 x 2 cdk-eventbridge-appsync-oauth/cdk/lib
cdk-eventbridge-appsync/cdk/lib
main.ts
main.ts
 99:158 (44%)
50:109 (59%)
 view
41 x 2 apigw-vpclink-pvt-alb
cognito-restapi-vpclink
template.yml
ecs.yml
 128:168 (20%)
162:204 (25%)
 view
37 x 2 apigw-to-private-apig-cdk/src/vpc
private-apigw-lambda-cdk/src/vpc
index.ts
index.ts
 5:53 (100%)
5:53 (100%)
 view
27 x 2 eventbridge-api-destinations/1-webhook-site
eventbridge-api-destinations/2-slack
template.yaml
template.yaml
 32:60 (33%)
33:61 (31%)
 view
26 x 2 apigw-vpclink-pvt-alb
cognito-restapi-vpclink
template.yml
ecs.yml
 92:118 (12%)
123:150 (16%)
 view
25 x 2 cdk-eventbridge-appsync/cdk/lib
cdk-lambda-appsync/cdk/lib
schema.graphql
schema.graphql
 1:29 (100%)
1:29 (100%)
 view
25 x 2 fargate-sns-sqs-cdk/cdk/src/src
fargate-sqs-cdk/cdk/src/src
index.ts
index.ts
 31:62 (53%)
29:60 (55%)
 view
25 x 2 appsync-direct-lambda-resolver/cdk/lib
cdk-lambda-appsync/cdk/lib
schema.graphql
schema.graphql
 1:29 (100%)
1:29 (100%)
 view
25 x 2 appsync-direct-lambda-resolver/cdk/lib
cdk-eventbridge-appsync/cdk/lib
schema.graphql
schema.graphql
 1:29 (100%)
1:29 (100%)
 view
24 x 2 appsync-notify-subscribe...database-updates/1-http
cognito-httpapi
auth.yaml
auth.yaml
 13:39 (41%)
20:46 (35%)
 view
24 x 2 appsync-dynamodb-singletable
appsync-dynamodb
template.yaml
template.yaml
 24:47 (13%)
16:39 (14%)
 view
22 x 2 eventbridge-api-destinations/2-slack
eventbridge-api-destinations/4-mongodb
template.yaml
mongoDB.yaml
 33:55 (25%)
43:65 (20%)
 view
22 x 2 appsync-notify-subscribe...database-updates/1-http
cognito-httpapi
auth.yaml
auth.yaml
 45:72 (37%)
55:82 (32%)
 view
22 x 2 eventbridge-api-destinations/1-webhook-site
eventbridge-api-destinations/4-mongodb
template.yaml
mongoDB.yaml
 32:54 (27%)
43:65 (20%)
 view
21 x 2 eventbridge-api-destinations/2-slack
eventbridge-api-destinations/5-zendesk
template.yaml
ZendeskAPIDestination.yaml
 33:54 (24%)
38:59 (21%)
 view
21 x 2 eventbridge-api-destinations/4-mongodb
eventbridge-api-destinations/5-zendesk
mongoDB.yaml
ZendeskAPIDestination.yaml
 43:64 (19%)
38:59 (21%)
 view
21 x 2 eventbridge-api-destinations/1-webhook-site
eventbridge-api-destinations/5-zendesk
template.yaml
ZendeskAPIDestination.yaml
 32:53 (25%)
38:59 (21%)
 view
20 x 2 s3-lambda/src
s3-sqs-lambda/src
app.js
app.js
 23:51 (68%)
27:54 (66%)
 view
20 x 2 sfn-apigw
sfn-lambda
template.yaml
template.yaml
 52:71 (27%)
52:71 (34%)
 view
19 x 2 apigw-canary-deployment-cdk/src
apigw-http-api-lambda-cdk/src
index.py
index.py
 10:31 (82%)
21:42 (63%)
 view
Duplicated Units
The list of top 2 duplicated units.
See data for all 2 unit duplicates...
Size#FoldersFilesLinesCode
40 x 2 apigw-to-private-apig-cdk/src/vpc
private-apigw-lambda-cdk/src/vpc
index.ts
index.ts
 8:55 
8:55 
 view
17 x 2 appsync-notify-subscribe...se-updates/3-lambda/src
appsync-notify-subscribe...se-updates/3-lambda/src
lambdaUsesApiKey.js
lambdaUsesIAM.js
 7:24 
18:35 
 view