Creating a Flow Trigger

Flow trigger types include APIG, SMN, and timer.

Log in to the FunctionGraph console, and choose Flows in the navigation pane.
On the Flows page, find the target flow, and click Edit.
Click the Start node. On the displayed page, click Create Trigger and set Trigger Type to Timer.

Figure 1 Timer trigger

Set the trigger information. As shown in Table 1, parameters with an asterisk (*) are mandatory.

**Table 1** Timer trigger information
Parameter	Description
* Rule	Triggering rule of the timer. Currently, only cron expressions are supported.
* Cron Expression	Specifies the date and time when the flow will be scheduled. For details, see Cron Expressions for a Function Timer Trigger.
Additional Info	Must be in JSON format and contain an input. The value of input will be passed to the flow.

The shared gateway is no longer available. Only existing customers who previously used this feature can continue using it.

APIG flow triggers support only IAM authentication.

Return to the FunctionGraph console, and choose Flows in the navigation pane.
On the Flows page, find the target flow, and click Edit.
Click the Start node. On the displayed page, click Create Trigger and set Trigger Type to API Gateway (shared).

Figure 2 API Gateway (shared) trigger

Set the trigger information. As shown in Table 2, parameters with an asterisk (*) are mandatory.

**Table 2** APIG (shared) trigger information
Parameter	Description
* API Group	An API group facilitates management of APIs used for the same service. In this example, select APIGroup_test.
* Environment	An API can be called in different environments, such as production, test, and development. APIG supports environment management, allowing you to define different request paths for an API in different environments. To ensure that the API can be called, select RELEASE.
* Visibility	Options: Public and Private.
* Path	Path for requesting the API. Format: /users/projects
* Method	The API calling method. Options: GET, POST, DELETE, PUT, PATCH, HEAD, OPTIONS, and ANY. ANY indicates that the API can be called using any request method.

APIG flow triggers support only IAM authentication.
Ensure that you have created a dedicated gateway before this operation. For details, see Buying a Dedicated Gateway.

Return to the FunctionGraph console, and choose Flows in the navigation pane.
On the Flows page, find the target flow, and click Edit.
Click the Start node. On the displayed page, click Create Trigger and set Trigger Type to API Gateway (dedicated).

Figure 3 API Gateway (dedicated) trigger

Set the trigger information. As shown in Table 3, parameters with an asterisk (*) are mandatory.

**Table 3** APIG (dedicated) trigger information
Parameter	Description
* Gateway	Select a dedicated gateway.
* API Group	An API group facilitates management of APIs used for the same service. In this example, select APIGroup_test.
* Environment	An API can be called in different environments, such as production, test, and development. APIG supports environment management, allowing you to define different request paths for an API in different environments. To ensure that the API can be called, select RELEASE.
* Visibility	Options: Public and Private.
* Path	The path for requesting the API. Format: /users/projects
* Method	The API calling method. Options: GET, POST, DELETE, PUT, PATCH, HEAD, OPTIONS, and ANY. ANY indicates that the API can be called using any request method.

Return to the FunctionGraph console, and choose Flows in the navigation pane.
On the Flows page, find the target flow, and click Edit.
Click the Start node. On the displayed page, click Create Trigger and set Trigger Type to EventGrid.
Select an event channel and source. Events from this source will trigger the flow.

Figure 4 EG trigger

Set the trigger information, as shown in Table 4. Parameters with an asterisk (*) are mandatory.

**Table 4** Timer trigger information
Parameter	Description
* Provider	EG event source provider. Huawei Cloud and custom event sources are supported.
* Event channel	Receives events from the specified source to trigger the function flow.
* Event source name	Event sources include Huawei Cloud services and custom applications. They produce events and publish them to EG.
Event types	Types of events that will trigger the function flow.