template.yaml

Transform: AWS::Serverless-2016-10-31
Globals:
  Function:
    Timeout: 30

Parameters:
  TwitterHashtagParam:
    Type: String
    Default: CoronaVirus
    Description: Twitter hashtag value to track
  
  TwitterTweetCount:
    Type: Number
    Default: 10
    MaxValue: 100
    MinValue: 1
    Description: Number of popular tweets to store in DynamoDB during lambda execution time
    
  DynamoDBTablename:
    Type: String
    Default: twitter-table-dev
    Description: DynamoDB table name
    
  TwitterComsumerKey:
    Type: String
    Description: Twitter app Consumer Key
  
  TwitterConsumerSecret:
    Type: String
    Description: Twitter app Consumer Secret
  
  TwitterAccessToken:
    Type: String
    Description: Twitter app Access Token
  
  TwitterAccessTokenSecret:
    Type: String
    Description: Twitter app Access Token Secret
    
Resources:

  HashTagSimpleAnalyticFunction:
    Type: AWS::Serverless::Function
    Properties:
      Description: Access tweets by hashtag and query params
      FunctionName: hashtag-analytics
      CodeUri: ./hashtag-analytics-lambda
      Handler: app.lambda_handler
      Runtime: nodejs12.x
      MemorySize: 256
      Policies:
        - DynamoDBReadPolicy:
            TableName: !Ref DynamoDBDataStore
      Environment:
        Variables:
          TABLE_NAME: !Ref DynamoDBDataStore
      Events:
        GetTweets:
          Type: Api
          Properties:
            Path: /tweets
            Method: GET
            RestApiId:
              Ref: HashTagAnalyticsApi

  TwitterSearchFunction:
    Type: AWS::Serverless::Function
    Properties:
      Description: Twitter hashtag tracker
      FunctionName: hashtracker
      CodeUri: ./hashtag-tracker-lambda
      Handler: app.lambda_handler
      Runtime: nodejs12.x
      MemorySize: 256
      Policies:
        - DynamoDBWritePolicy:
            TableName: !Ref DynamoDBDataStore
      Environment:
        Variables:
          TABLE_NAME: !Ref DynamoDBDataStore
          HASHTAG: !Ref TwitterHashtagParam
          TWEET_COUNT: !Ref TwitterTweetCount
          TWITTER_CONSUMER_KEY: !Ref TwitterComsumerKey
          TWITTER_CONSUMER_SECRET: !Ref TwitterConsumerSecret
          TWITTER_ACCESS_TOKEN_KEY: !Ref TwitterAccessToken
          TWITTER_ACCESS_TOKEN_SECRET: !Ref TwitterAccessTokenSecret
          
      Events:
        Timer:
          Type: Schedule
          Properties:
            Schedule: rate(60 minutes)
      
    DependsOn: DynamoDBDataStore
    
  DynamoDBDataStore:
    Type: AWS::DynamoDB::Table
    Properties:
      TableName: !Ref DynamoDBTablename
      KeySchema:
      - AttributeName: PK
        KeyType: HASH
      - AttributeName: SK
        KeyType: RANGE
      BillingMode: PAY_PER_REQUEST
      AttributeDefinitions:
      - AttributeName: PK
        AttributeType: S
      - AttributeName: SK
        AttributeType: N
      - AttributeName: retweet_count
        AttributeType: N
      - AttributeName: favorite_count
        AttributeType: N
      - AttributeName: tweet_created_at
        AttributeType: S
      LocalSecondaryIndexes:
      - IndexName: retweet_count-index
        KeySchema:
        - AttributeName: PK
          KeyType: HASH
        - AttributeName: retweet_count
          KeyType: RANGE
        Projection:
          ProjectionType: ALL
      - IndexName: favorite_count-index
        KeySchema:
        - AttributeName: PK
          KeyType: HASH
        - AttributeName: favorite_count
          KeyType: RANGE
        Projection:
          ProjectionType: ALL
      - IndexName: tweet_created_at-index
        KeySchema:
        - AttributeName: PK
          KeyType: HASH
        - AttributeName: tweet_created_at
          KeyType: RANGE
        Projection:
          ProjectionType: ALL
  
  HashTagAnalyticsApi:
    Type: AWS::Serverless::Api
    Properties:
      StageName: dev
      EndpointConfiguration: REGIONAL
      OpenApiVersion: 3.0.3
      DefinitionBody:
        'Fn::Transform':
          Name: 'AWS::Include'
          Parameters:
            Location: hashtag-tracker-openapi.yaml
            
Outputs:
  ApiUrl:
    Description: "API url of the dev environment"
    Value: !Sub "https://${HashTagAnalyticsApi}.execute-api.${AWS::Region}.amazonaws.com/dev/"