doc-exports/docs/fg/umn/functiongraph_01_0202.html

Using an SMN Trigger

This section describes how to create an SMN trigger and publish a message to trigger a function.

For details about the SMN event source, see section "Supported Event Sources".

Prerequisites

• You have created an SMN topic, for example, smn-test. For details, see Creating a Topic.
• You have created a function. For details, see Creating a Function from Scratch.

Creating an SMN Trigger

1. Log in to the FunctionGraph console. In the navigation pane, choose Functions > Function List.
2. Click the function to be configured to go to the function details page.
3. Choose Configuration > Triggers and click Create Trigger.
   Figure 1 Creating a trigger
   

4. Set the following parameters:
   • Trigger Type: Select Simple Message Notification (SMN).
   • Topic Name: Select a topic, for example, smn-test.

5. Click OK.
   

   After the SMN trigger is created, a subscription is generated for the corresponding topic on the SMN console.

Publishing a Message to Trigger the Function

On the SMN console, publish a message to the smn-test topic. For details, see Publishing a Text Message.

Table 1 describes the parameters required for publishing a message.

Table 1 Parameters required for publishing a message

Parameter	Description
Subject	Enter SMN-Test.
Message Format	Select Text.
Message	Enter {"message":"hello"}.

After a message is published, the function is triggered automatically. For details about example events, see section "Supported Event Sources".

Viewing the Execution Result

1. Return to the FunctionGraph console. In the navigation pane, choose Functions > Function List.
2. Click a function to go to the function details page.
3. Choose Monitoring > Logs to query function running logs.

Parent topic: Creating Triggers