#COS (Cloud Object Storage)

#Event Definition

This example sets up a COS event which will trigger the hello_world function whenever an object is uploaded to the cli-appid.cos.ap-beijing.myqcloud.com under your account.

# serverless.yml

functions:
  hello_world:
    handler: index.main_handler
    runtime: Nodejs8.9

    events:
      - cos:
          name: cli-appid.cos.ap-beijing.myqcloud.com
          parameters:
            bucket: cli-appid.cos.ap-beijing.myqcloud.com
            filter:
              prefix: filterdir/
              suffix: .jpg
            events: cos:ObjectCreated:*
            enable: true

• Use events in COS trigger to set the specific trigger event. In the example, the function is called whenever an object is uploaded to the bucket.

• Use filter rules to configure COS trigger, In the example, the function is called whenever an image with .jpg extension is uploaded to folder filterdir in the bucket.

See the documentation about the COS Trigger to get more detail.

#Event Message Structure for COS Trigger

When an object creation or deletion event occurs in the specified COS bucket, event data will be sent to the bound SCF function in JSON format as shown below.

{
  "Records": [
    {
      "cos": {
        "cosSchemaVersion": "1.0",
        "cosObject": {
          "url": "http://testpic-1253970026.cos.ap-chengdu.myqcloud.com/testfile",
          "meta": {
            "x-cos-request-id": "NWMxOWY4MGFfMjViMjU4NjRfMTUyMV8yNzhhZjM=",
            "Content-Type": ""
          },
          "vid": "",
          "key": "/1253970026/testpic/testfile",
          "size": 1029
        },
        "cosBucket": {
          "region": "cd",
          "name": "testpic",
          "appid": "1253970026"
        },
        "cosNotificationId": "unknown"
      },
      "event": {
        "eventName": "cos:ObjectCreated:*",
        "eventVersion": "1.0",
        "eventTime": 1545205770,
        "eventSource": "qcs::cos",
        "requestParameters": {
          "requestSourceIP": "192.168.15.101",
          "requestHeaders": {
            "Authorization": "q-sign-algorithm=sha1&q-ak=AKIDQm6iUh2NJ6jL41tVUis9KpY5Rgv49zyC&q-sign-time=1545205709;1545215769&q-key-time=1545205709;1545215769&q-header-list=host;x-cos-storage-class&q-url-param-list=&q-signature=098ac7dfe9cf21116f946c4b4c29001c2b449b14"
          }
        },
        "eventQueue": "qcs:0:lambda:cd:appid/1253970026:default.printevent.$LATEST",
        "reservedInfo": "",
        "reqid": 179398952
      }
    }
  ]
}