SMN

Function Overview

• A topic is a specified event for message publishing or subscription notification. It serves as a message sending channel, where publishers and subscribers can interact with each other. Before configuring notifications, you must create a topic.
• VOD notification types include Transcoding completed, Snapshot captured, Review completed, Video uploaded, Audio extraction completed, and Thumbnail created. Subscription is to associate a subscriber to a topic. A user can have multiple topics, and each topic has multiple subscribers.

Process Flow

Figure 1 shows the process of configuring notifications.

Figure 1 Process of configuring notifications

1. Create an SMN Topic on the SMN console.
2. Configure a topic policy to authorize VOD to publish messages to the topic.
3. Configure notifications on the VOD console so that you can receive notifications during operations such as transcoding, snapshot capturing, and review.

Creating an SMN Topic

1. Log in to the SMN console. In the navigation pane, choose Topic Management > Topics. The Topics page is displayed.
2. Click Create Topic in the upper right corner.
3. In the displayed dialog box, configure topic information by referring to Table 1. Click OK.

   Table 1 Topic parameters

   Parameter	Description
   Topic Name	This parameter is mandatory. A topic name can include only letters, digits, hyphens (-), and underscores (_) and must start with a letter or digit. Length: 1–256 characters
   Display Name	This parameter is optional. When sending an email: If the display name is not set, the sender is displayed as username@example.com. Otherwise, the email sender is presented as Display name<username@example.com>.
   Tag	Identifies cloud resources. This parameter is optional.

4. Click Add Subscription in the Operation column.
5. Configure the subscription protocol and endpoints. See Figure 2.
   Figure 2 Adding a subscription
   

   Table 2 describes the subscription parameters.

   Table 2 Subscription parameters

   Parameter	Description
   Topic Name	Name of the topic to be subscribed to. Retain the default value.
   Protocol	Message notification method. Select a protocol from the drop-down list. The common protocols used by MPC are SMS, email, and HTTP/HTTPS.
   Endpoint	Subscription endpoint. You can enter up to 10 SMS, email, HTTP, or HTTPS endpoints, one in each line. SMS: Enter one or more valid phone numbers. The phone number must be preceded by a plus sign (+) and a country code. Examples: +8600000000000 +8600000000001 Email: Enter one or more valid email addresses. Examples: username@example.com username2@example.com HTTP or HTTPS: Enter one or more public network URLs. HTTPS is recommended, as it is more secure than HTTP. Examples: https://example.com/notification/action https://example2.com/notification/action

6. Receive a subscription confirmation message and confirm subscription. If the subscription endpoint is an email address, the page shown in Figure 3 is displayed. Then, the subscription endpoints can receive messages published to the topic.
   Figure 3 Message subscription confirmation
   

Configuring a Topic Policy

1. In the navigation pane of the SMN console, choose Topic Management > Topics.
2. Click More > Configure Topic Policy in the Operation column.
3. Configure topic policy parameters by referring to Figure 4.
   Figure 4 Configuring a topic policy
   

   Topic policies are classified into basic mode and advanced mode. The basic mode simply specifies which users or cloud services have permissions to publish messages to a topic. See Figure 4.

   Table 3 Description for configuring a topic policy in basic mode

   Item	Settings	Description
   Users who can publish messages to this topic	Topic creator	Only the topic creator has permission to publish messages to the topic.
   	All users	All users have permission to publish messages to the topic.
   	Specified user accounts	Only specified users have permission to publish messages to the topic. Users are specified in the format urn:csp:iam::domainId:root, in which domainId indicates the account ID of a user. Every two users are separated with a comma (,). SMN does not limit the number of users you can specify, but the total length of a topic policy cannot exceed 30 KB. NOTE: Enter the account ID of the user and click OK. Other information is automatically supplemented by the system. To obtain a user's account ID, log in to the SMN console, hover the mouse over the username in the upper right corner and choose My Credentials from the drop-down list.
   Services that can publish messages to this topic	See Figure 4.	Select VOD. VOD has the permissions to access the topic.

Configuring Notifications

1. Log in to the VOD console.
2. In the navigation pane, choose Global Settings > Notification Settings.
   Figure 5 Configuring notifications
   

3. Select one or more events.
4. Select one or more message types.
   

   If Template message and JSON message are both selected, you will receive template messages via SMS and email, and receive JSON messages via HTTP and HTTPS.

   • Select Template message. Table 2 describes what a template message looks like. The variables in the notification text message are subject to the actual operation.

     Table 4 Template message

     Event	Status	Message Body
     Transcoding completed	Completed	Dear user, your video transcoding task has been completed. Video ID: {asset_id}; name: {title}. Log in to the VOD console or call a VOD API to view transcoding details.
     	Failed	Dear user, an error occurred when transcoding your video. Video ID: {asset_id}; name: {title}; error code: {err_code}; error information: {err_msg}.
     Snapshot captured	Completed	Dear user, your snapshot task has been completed. Video ID: {asset_id}; name: {title}. Log in to the VOD console or call a VOD API to view snapshot details.
     	Failed	Dear user, an error occurred when processing your snapshot task. Video ID: {asset_id}; name: {title}; error code: {err_code}; error information: {err_msg}.
     Review completed	Completed	Dear user, your review task has been completed. Video ID: {asset_id}; name: {title}; review advice: {suggestion}. Log in to the VOD console or call a VOD API to view review details.
     	Failed	Dear user, an error occurred when reviewing your video. Video ID: {asset_id}; name: {title}; error code: {err_code}; error information: {err_msg}.
     Video uploaded	Completed	Dear user, your video has been uploaded. Video ID: {asset_id}; name: {title}. Log in to the VOD console or call a VOD API to view video details.
     	Failed	Dear user, an error occurred when uploading your video. Video ID: {asset_id}; name: {title}; error code: {err_code}; error information: {err_msg}.
     Audio extraction completed	Completed	Dear user, your audio extraction task has been completed. Audio ID: {asset_id}; name: {title}. Log in to the VOD console or call a VOD API to view audio details.
     	Failed	Dear user, an error occurred when processing your audio extraction task. Audio ID: {asset_id}; name: {title}; error code: {err_code}; error information: {err_msg}.
     Thumbnail created	Completed	Dear user, your video thumbnail has been created. Video ID: {asset_id}; name: {title}. Log in to the VOD console or call a VOD API to view video details.
     	Failed	Dear user, your video thumbnail fails to be created. Video ID: {asset_id}; name: {title}; error code: {err_code}; error information: {err_msg}.
     Parse complete	Completed	Dear user, your video has been parsed. Video ID: {asset_id}; name: {title}. Log in to the VOD console or call a VOD API to view video details.
     	Failed	Dear user, an error occurred when parsing your video. Video ID: {asset_id}; name: {title}; error code: {err_code}; error information: {err_msg}.

   • Select JSON message. Table 3 describes what a template message looks like.

     Table 5 JSON message

     Parameter	Description	Type
     event_type	Event type. The options are as follows: transcodeComplete: transcoding (encryption) completed thumbnailComplete: snapshot captured reviewComplete: review completed createComplete: media file created audioExtractComplete: audio extracted coverComplete: thumbnail created parseComplete: media file parsed	String
     transcode_info	Transcoding (including encryption) message. For details, see Transcoding Message Body.	TranscodeInfo
     thumbnail_info	Snapshot message. For details, see Snapshot Message Body.	ThumbnailInfo
     review_info	Review message. For details, see Review Message Body.	ReviewInfo
     create_info	Media file upload message. For details, see Media Upload and Audio Extraction Message Body.	AssetInfo
     audio_extract_info	Audio extraction message. For details, see Media Upload and Audio Extraction Message Body.	AssetInfo
     cover_info	Thumbnail message. For details, see Thumbnail Message Body.	CoverInfo
     parse_info	Media file parsing completion message. This parameter is available only when a media file has been parsed. For details, see Media File Parsing Message Body.	ParseInfo

5. Select an SMN topic.
6. Click OK.