EventGrid

EventGrid (EG) is a serverless event bus service for standard and centralized access of Huawei Cloud services and custom or SaaS applications. You can build a loosely coupled, distributed event-driven architecture to flexibly route events via CloudEvents.

EG triggers are used to quickly create event subscriptions that use Huawei Cloud services or custom applications as event sources and composite application flow tasks as event targets. In this way, you can configure and process subscription events detected by EG in workflows.

Action

Huawei Cloud event source
Custom event source

Configuring Parameters

**Table 1** Huawei Cloud event source
Parameter	Description
Event Subscription Name	Name of the event subscription created in EG
Region	Region of EG
Project	Project to which EG belongs
Channel	Event channel: Store received messages and route them to targets as specified by relevant rules.
Event Source	Huawei Cloud service event source
Event Type	Event type of a Huawei Cloud service, which is used to generate filter rules.
Filter Rule	Event filtering rule. For details, see Event Rules.
Connections	Target connection of EG
Event Transformation Rule	Pass-through: Route the complete structure of native events directly to the target. Variable: Route only parameters extracted from events with JSONPath to the target. Constant: Route only constants in events to the target as a trigger.

**Table 2** Custom event source
Parameter	Description
Event Subscription Name	Name of the event subscription created in EG
Region	Region of EG
Project	Project to which EG belongs
Channel	Event channel: Store received messages and route them to targets as specified by relevant rules.
Event Source	Custom event source
Filter Rule	Event filtering rule. For details, see Event Rules.
Connections	Target connection of EG
Event Transformation Rule	Pass-through: Route the complete structure of native events directly to the target. Variable: Route only parameters extracted from events with JSONPath to the target. Constant: Route only constants in events to the target as a trigger.