serverless.yml

org: upstandfm
app: api
service: audio-transcoder

provider:
  name: aws
  runtime: nodejs12.x
  stage: ${opt:stage, 'prod'}
  region: ${opt:region, 'eu-central-1'}
  cfnRole: ${secrets:CFN_ROLE_ARN}
  memorySize: 128
  timeout: 3
  deploymentBucket:
    name: upstandfm-deployments
    serverSideEncryption: AES256
  environment:
    # Reuse TCP connection to reduce request latency
    # For more info see:
    # https://github.com/aws/aws-sdk-js/blob/master/CHANGELOG.md#24630
    AWS_NODEJS_CONNECTION_REUSE_ENABLED: 1
    # The ARN has the format "arn:aws:s3:::bucketName"
    # Splitting on ":::" gives us the name
    S3_RECORDINGS_BUCKET_NAME:
      'Fn::Select':
        ['1', { 'Fn::Split': [':::', '${state:infra.recordingsBucketArn}'] }]
    S3_TRANSCODED_RECORDINGS_BUCKET_NAME:
      'Fn::Select':
        [
          '1',
          {
            'Fn::Split':
              [':::', '${state:infra.transcodedRecordingsBucketArn}'],
          },
        ]
    WORKSPACES_TABLE_NAME:
      'Fn::Select':
        ['1', { 'Fn::Split': ['/', '${state:infra.workspacesTableArn}'] }]

  # See: https://docs.aws.amazon.com/IAM/latest/UserGuide/reference_policies_actions-resources-contextkeys.html
  iamRoleStatements:
    - Effect: Allow
      Action:
        - s3:GetObject
      # MUST contain "/*" because resource type is "object"
      Resource:
        'Fn::Join': ['/', ['${state:infra.recordingsBucketArn}', '*']]
    - Effect: Allow
      Action:
        - s3:GetObject
      # MUST contain "/*" because resource type is "object"
      Resource:
        'Fn::Join': ['/', ['${state:infra.transcodedRecordingsBucketArn}', '*']]
    - Effect: Allow
      Action:
        - s3:PutObject
      # MUST contain "/*" because resource type is "object"
      Resource:
        'Fn::Join':
          ['/', ['${state:infra.transcodedRecordingsBucketArn }', '*']]
    - Effect: Allow
      Action:
        - dynamodb:PutItem
        - dynamodb:UpdateItem
      Resource: ${state:infra.workspacesTableArn}

package:
  exclude:
    - ./*
    - ./**/*.spec.js
  include:
    - node_modules
    - src

functions:
  ffmpegWebmToMp3:
    memorySize: 2048
    timeout: 10
    handler: src/consumers.ffmpegWebmToMp3
    description: Transcodes a WebM audio recording to MP3 using FFmpeg
    events:
      - sns: ${state:infra.newS3AudioRecordingTopicArn}
    layers:
      - ${state:lambda-layers.ffmpegArn}
  createRecording:
    handler: src/consumers.createRecording
    description: Creates a recording item in DB when a new audio recording was uploaded
    events:
      - sns: ${state:infra.newS3AudioRecordingTopicArn}
  updateRecording:
    handler: src/consumers.updateRecording
    description: Updates a recording item in DB when an audio recording has been transcoded
    events:
      - sns: ${state:infra.newS3TranscodedAudioRecordingTopicArn}