Configuring the Source Storage Service to Send Synchronization Requests

Scenarios

After you create a synchronization task, you need to configure the source object storage service to request OMS to migrate newly added and modified source objects. To do so, you can use a message notification or function service on the source platform.

Desired Effects

• The names of newly added and modified objects in the source bucket can be obtained in real time.
• The OMS synchronization API can be invoked to migrate the newly added and modified objects to the destination bucket.

Configuration Methods

• Using the source object storage service and the function service
  

  On the source platform, you need to create a function and configure an event trigger for synchronizing incremental source objects through OMS.

  When objects are added to or modified in the source bucket, the source object storage service will call the configured function to trigger migration of these objects to the destination bucket.

• Using a service system and a message notification service
  

  When objects are added or modified in the source bucket, the service system captures the information about these objects through the messages received from the source object storage service or by proactively analyzing database changes. Then the system invokes the synchronization API of OMS to migrate the newly added and modified objects from the source bucket to the destination bucket.

Procedure

The following takes Huawei Cloud as the source platform and describes how to use FunctionGraph to send synchronization requests.

The created function must be in the same region as the source bucket.

1. Sign in to the console.
2. Click Service List and choose Compute > FunctionGraph.

   The FunctionGraph console is displayed.

3. In the navigation pane on the left, choose Templates.
4. In the search box on the displayed page, enter OMS and locate the Data synchronization template, as shown in Figure 1.
   Figure 1 OMS data synchronization template
   
   

   Click View details to view the template details, such as template type, input parameters, output parameters, and precautions.

5. Click Configure.
6. Set parameters in the Basic Information area by referring to Table 1.
   Figure 2 Setting basic parameters
   

   Table 1 Basic parameters for creating a function

   Parameter	Description
   Template	Retain sync-oms-data.
   Region	Select the region where the source bucket is located.
   Project	Select a project in the selected region.
   Function Name	Specify a function name. The name must: Consist of 1 character to 60 characters, allowing letters, digits, hyphens (-), and underscores (_). Start with a letter and end with a letter or digit.
   Enterprise Project	Set this parameter as needed. The value defaults to default.
   Agency	Select Use no agency.
   Runtime	The value defaults to Python 3.6 and cannot be modified.
   Create trigger	Select Object Storage Service (OBS).

7. Set parameters in the Environment Variables area by referring to Table 2.
   Figure 3 Setting environment variables
   

   Table 2 Environment variables

   Parameter	Description
   sync_url	Enter the address for receiving synchronization requests. It can be obtained from the synchronization task details.
   sync_task_id	Enter the synchronization task ID, which can be obtained from the synchronization task list.
   log_bucket	Enter the name of the bucket used for storing the function execution logs. Here also stores the lists of objects for which synchronization requests are sent or fail to be sent to OMS. CAUTION: The log bucket must be in the account used to create the synchronization task.
   obs_endpoint	Enter the OBS domain name in the region where the log bucket is located. For details about regions and endpoints, see Regions and Endpoints.
   hw_ak	Enter the AK of the account used to create the synchronization task.
   hw_sk	Enter the SK of the account used to create the synchronization task.

8. Set trigger parameters. For details about the parameters, see Table 3.
   Figure 4 Creating a trigger
   

   Table 3 Parameters required for creating a trigger

   Parameter	Description
   Trigger Type	Object Storage Service (OBS)
   Bucket Name	Select the source bucket that stores the data to be synchronized.
   Events	Set this parameter based on your requirements.
   (Optional) Event Notification Name	An event name is automatically generated. You can specify a name as needed.
   (Optional) Prefix	Enter a prefix to limit notifications to objects whose names start with the matching characters.
   (Optional) Suffix	Enter a suffix to limit notifications to objects whose names end with the matching characters.

9. Click Create Function.

   The function details page is displayed.

10. Click the Configuration tab. On the Basic Settings page, set Execution Timeout (s) to 60 and click Save.
    Figure 5 Setting the execution timeout interval
    

11. Click OK.
    

    You need to configure a test event to verify the function.

12. Click the Code tab and select Configure Test Event from the drop-down list in the Code Source area. The Configure Test Event dialog box is displayed, as shown in Figure 6. Set the parameters listed in Table 4.
    Figure 6 Configuring a test event
    

    Table 4 Parameters required for configuring a test event

    Parameter	Description
    Configure Test Event	Use the default option Create new test event.
    Event Template	Select obs-event-template in the event template list.
    Event Name	An event name is automatically generated. You can specify a name as needed.

13. Click Create.
14. Click Test. The test result is displayed on the right of the page.
    Figure 7 Viewing the test result
    
    

    After the test succeeds, upload an object to the source bucket. Wait for 10 minutes. Then the object will be synchronized to the destination bucket.

Obtaining Object Lists

The objects in the lists are those to be synchronized.