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‎.circleci/config.yml

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version: 2
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executors:
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default:
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working_directory: ~/workspace
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docker:
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- image: lambci/lambda:build-python3.7
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references:
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commands:
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install_sls: &install_sls
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name: Install Serverless
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command: |
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#apt-get install curl
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curl -sL https://rpm.nodesource.com/setup_10.x | bash -
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yum install -y nodejs
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npm install npm@latest -g
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npm install
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install_dependencies: &install_dependencies
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name: Install dependencies
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command: |
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python3 -m venv venv
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. venv/bin/activate
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pip install -r requirements.txt
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jobs:
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setup:
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executor:
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name: default
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steps:
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- checkout
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- run: *install_sls
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- run: *install_dependencies
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- persist_to_workspace:
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root: ~/workspace
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paths:
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- ./*
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lint:
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executor:
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name: default
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steps:
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- attach_workspace:
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at: ~/workspace
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- run:
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name: Lint
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command: yarn lint
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workflows:
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version: 2
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build-deploy-flow:
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jobs:
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- setup:
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filters:
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tags:
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only: /.*/
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- lint:
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requires:
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- setup
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filters:
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tags:
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only: /.*/

‎.envrc.sample

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export PYTHONPATH=$PWD
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export AWS_DEFAULT_REGION=us-east-1
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export AWS_ACCESS_KEY_ID=xxxxxx
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export AWS_SECRET_ACCESS_KEY=yyyyyy
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export STAGE=dev

‎.gitignore

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# Distribution / packaging
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.Python
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env/
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build/
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develop-eggs/
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dist/
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downloads/
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eggs/
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.eggs/
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lib64/
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parts/
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sdist/
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var/
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*.egg-info/
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.installed.cfg
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*.egg
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venv
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node_modules
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.DS_Store
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__pycache__
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.envrc
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# Serverless directories
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.serverless

‎layer/layer.yml

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service: python-layer
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provider:
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name: aws
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region: ${file(serverless-common.yml):region}
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stage: ${file(serverless-common.yml):stage}
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runtime: ${file(serverless-common.yml):runtime}
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memorySize: ${file(serverless-common.yml):memorySize.${self:provider.stage}, file(serverless-common.yml):memorySize.default}
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deploymentBucket:
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name: ${file(serverless-common.yml):appname}.${file(serverless-common.yml):deploymentBucketPath.${self:provider.stage}, file(serverless-common.yml):deploymentBucketPath.default}.${self:provider.region}.deploys
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custom:
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dockerizePipDefault: false
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pythonRequirements:
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layer:
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name: ${self:provider.stage}-python-requirements
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description: Python requirements lambda layer
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compatibleRuntimes:
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- ${self:provider.runtime}
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fileName: layer/requirements.txt
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dockerizePip: ${opt:dockerizePip, self:custom.dockerizePipDefault}
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layers:
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lib:
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path: lib
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name: ${self:provider.stage}-lib
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description: libraries for this project
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compatibleRuntimes:
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- ${self:provider.runtime}
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plugins:
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- serverless-python-requirements

‎layer/requirements.txt

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jeffy==0.1.4

‎lib/utils.py

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"""utility functions."""
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import json
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import decimal
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def load_body(body):
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"""Load request body."""
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return json.loads(body)
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def response_builder(status_code, body={}):
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"""Generate api response."""
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return {
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'statusCode': status_code,
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'headers': {
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'Content-Type': 'application/json; charset=utf-8',
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'Access-Control-Allow-Origin': '*'
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},
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'body': json.dumps(body, cls=DecimalEncoder)
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}
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class DecimalEncoder(json.JSONEncoder):
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"""JSON encoder."""
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def default(self, obj):
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"""encoding."""
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if isinstance(obj, decimal.Decimal):
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return int(obj)
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return super(DecimalEncoder, self).default(obj)

‎package.json

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{
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"devDependencies": {
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"serverless": "^1.68.0",
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"serverless-iam-roles-per-function": "^2.0.2",
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"serverless-pseudo-parameters": "^2.5.0",
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"serverless-python-requirements": "^5.1.0",
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"serverless-step-functions": "^2.18.0"
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},
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"scripts": {
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"lint": "flake8 ./",
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"print:layer": "serverless print --config layer/layer.yml",
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"package:layer": "serverless package --config layer/layer.yml",
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"deploy:layer": "serverless deploy --config layer/layer.yml",
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"remove:layer": "serverless deploy --config layer/layer.yml",
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"print:db": "serverless print --config resources/dynamodb.yml",
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"package:db": "serverless package --config resources/dynamodb.yml",
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"deploy:db": "serverless deploy --config resources/dynamodb.yml",
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"remove:db": "serverless deploy --config resources/dynamodb.yml",
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"print:s3": "serverless print --config resources/s3.yml",
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"package:s3": "serverless package --config resources/s3.yml",
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"deploy:s3": "serverless deploy --config resources/s3.yml",
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"remove:s3": "serverless remove --config resources/s3.yml",
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"print:ssm": "serverless print --config resources/ssm.yml",
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"package:ssm": "serverless package --config resources/ssm.yml",
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"deploy:ssm": "serverless deploy --config resources/ssm.yml",
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"remove:ssm": "serverless remove --config resources/ssm.yml",
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"print:api": "serverless print --config services/api/serverless.yml",
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"package:api": "serverless package --config services/api/serverless.yml",
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"deploy:api": "serverless deploy --config services/api/serverless.yml",
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"remove:api": "serverless remove --config services/api/serverless.yml",
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"print:workflow": "serverless print --config services/workflow-service/serverless.yml",
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"package:workflow": "serverless package --config services/workflow-service/serverless.yml",
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"deploy:workflow": "serverless deploy --config services/workflow-service/serverless.yml",
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"remove:workflow": "serverless remove --config services/workflow-service/serverless.yml",
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"print:stream": "serverless print --config services/stream-service/serverless.yml",
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"package:stream": "serverless package --config services/stream-service/serverless.yml",
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"deploy:stream": "serverless deploy --config services/stream-service/serverless.yml",
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"remove:stream": "serverless remove --config services/stream-service/serverless.yml",
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"print:message": "serverless print --config services/message-service/serverless.yml",
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"package:message": "serverless package --config services/message-service/serverless.yml",
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"deploy:message": "serverless deploy --config services/message-service/serverless.yml",
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"remove:message": "serverless remove --config services/message-service/serverless.yml",
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"test:unit": "pytest tests/unit_tests -s",
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"test:workflow": "pytest tests/integration_tests/workflow_service -s",
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"test:api": "pytest tests/integration_tests/api -s"
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},
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"name": "python"
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}

‎requirements-dev.txt

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flake8==3.7.9
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pytest==5.4.1
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requests==2.22.0

‎resources/dynamodb.yml

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service: db
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provider:
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name: aws
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region: ${file(serverless-common.yml):region}
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stage: ${file(serverless-common.yml):stage}
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deploymentBucket:
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name: ${file(serverless-common.yml):appname}.${file(serverless-common.yml):deploymentBucketPath.${self:provider.stage}, file(serverless-common.yml):deploymentBucketPath.default}.${self:provider.region}.deploys
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custom:
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deploy:
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prod: prod
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default: dev
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resources:
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Parameters:
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ExampleTableName:
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Type: String
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Default: Example-${self:provider.stage}
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Resources:
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ExampleTable:
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Type: AWS::DynamoDB::Table
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Properties:
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TableName: !Ref ExampleTableName
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AttributeDefinitions:
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- AttributeName: ID
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AttributeType: S
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- AttributeName: Name
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AttributeType: S
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KeySchema:
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- AttributeName: ID
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KeyType: HASH
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- AttributeName: Name
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KeyType: RANGE
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BillingMode: PAY_PER_REQUEST
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PointInTimeRecoverySpecification:
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PointInTimeRecoveryEnabled: true
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StreamSpecification:
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StreamViewType: NEW_AND_OLD_IMAGES
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Outputs:
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ExampleTableName:
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Value: !Ref ExampleTable
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Export:
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Name: ExampleTableName-${self:provider.stage}
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ExampleTableArn:
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Value: !GetAtt ExampleTable.Arn
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Export:
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Name: ExampleTableArn-${self:provider.stage}
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ExampleTableStreamArn:
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Value: !GetAtt ExampleTable.StreamArn
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Export:
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Name: ExampleTableStreamArn-${self:provider.stage}

‎resources/s3.yml

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service: s3
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provider:
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name: aws
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region: ${file(serverless-common.yml):region}
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stage: ${file(serverless-common.yml):stage}
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deploymentBucket:
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name: ${file(serverless-common.yml):appname}.${file(serverless-common.yml):deploymentBucketPath.${self:provider.stage}, file(serverless-common.yml):deploymentBucketPath.default}.${self:provider.region}.deploys
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resources:
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Resources:
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ExampleBucket:
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Type: AWS::S3::Bucket
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Properties:
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BucketName: slsopsexample-bucket-${self:provider.stage}
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Outputs:
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ExampleBucketName:
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Value: !Ref ExampleBucket
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Export:
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Name: ExampleBucketName-${self:provider.stage}

‎resources/ssm.yml

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service: ssm
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provider:
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name: aws
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region: ${file(serverless-common.yml):region}
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stage: ${file(serverless-common.yml):stage}
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deploymentBucket:
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name: ${file(serverless-common.yml):appname}.${file(serverless-common.yml):deploymentBucketPath.${self:provider.stage}, file(serverless-common.yml):deploymentBucketPath.default}.${self:provider.region}.deploys
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resources:
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Resources:
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ExampleSecretValue:
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Type: AWS::SSM::Parameter
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Properties:
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Name: example-${self:provider.stage}
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Description: An example secret value
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Type: String
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Value: ${env:EXAMPLE_SECRET_VALUE, ''}

‎serverless-common.yml

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appname: myapp
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runtime: python3.8
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logRetentionInDays:
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prod: 90 # 90 days in [prod] stage
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default: 3 # 3 days in other stages
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memorySize:
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prod: 512
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default: 128
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stage: ${env:STAGE}
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region: ${env:AWS_DEFAULT_REGION}
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deploymentBucketPath:
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prod: prod
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default: dev

‎services/api/hello.py

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"""Hello Lambda function."""
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import json
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def handler(event, context):
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"""Hello Lambda function."""
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body = {
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"message": "Go Serverless v1.0! Your function executed successfully!",
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"input": event
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}
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response = {
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"statusCode": 200,
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"body": json.dumps(body)
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}
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return response
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# Use this code if you don't use the http event with the LAMBDA-PROXY
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# integration
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"""
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return {
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"message": "Go Serverless v1.0! Your function executed successfully!",
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"event": event
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}
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"""

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