Your Alibaba Cloud Function can be triggered by different event sources. Those event sources can be defined and configured with the help of the event event.

#OSS events

This example sets up a oss event which will trigger the first function whenever an object is uploaded to the my-service-resource under the account specified by the ALIYUN_ACCOUNT environment variable.

# serverless.yml

    handler: index.first
      - oss:
          sourceArn: acs:oss:cn-shanghai:${env:ALIYUN_ACCOUNT}:my-service-resource
              - oss:ObjectCreated:PutObject
// index.js

exports.first = (event, context, callback) => {
  const response = {
    statusCode: 200,
    body: JSON.stringify({
      message: 'Hello!',

  callback(null, response);

Note: See the documentation about the function handlers to learn how your handler signature should look like to work this type of event.

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