19、Knative Eventing：CloudEvent过滤机制详解

Knative Eventing：CloudEvent过滤机制详解

1. 认识Broker与Trigger

在开发过程中，通常无需手动设置Broker，Knative会为我们安装一个带有基本默认设置的Broker，用于开发环境。安装完成后，Broker会监听提交或修改的Trigger。

我们可以通过创建一个Trigger并进行查看来验证这一点，示例代码如下：

$ kn trigger create example-trigger \
--filter type=dev.knative.example.com \
--sink http://example.com/
Trigger 'example-trigger' successfully created in namespace 'default'.
$ kn trigger describe example-trigger
Name:
example-trigger
Namespace:
default
Labels:
eventing.knative.dev/broker=default    
Annotations:
eventing.knative.dev/creator=jchester@example.com,
➥eventing.knative.dev/lastModifier ...
Age:
1m
Broker:
default              
Filter:
type:
dev.knative.example.com
Sink:
URI:
http://example.com/
Conditions:
OK TYPE
AGE REASO