08-Event Sources和Sink架构

1 PingSource -> Kubernetes Service Sink

架构模型

示例1

部署一个kubernetes类型的sink，这里面还是以event-display为例，下面是资源清单

---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: event-display
spec:
  replicas: 1
  selector:
    matchLabels: &labels
      app: event-display
  template:
    metadata:
      labels: *labels
    spec:
      containers:
        - name: event-display
          image: ikubernetes/event_display
---
kind: Service
apiVersion: v1
metadata:
  name: event-display
spec:
  selector:
    app: event-display
  ports:
  - protocol: TCP
    port: 80
    targetPort: 8080

定义pingsource资源，指定sink为event-display

apiVersion: sources.knative.dev/v1
kind: PingSource
metadata:
  name: ping-00001
spec:
  schedule: "* * * * *"
  contentType: "application/json"
  data: '{"message": "Hello Eventing!"}'
  sink:
    ref:
      apiVersion: v1
      kind: Service
      name: event-display

后面knative-eventing的namespace会出现pingsource的POD

在这里插入图片描述

获取event-display当中的日志信息，验证是否进行了事件发送
```
kubectl logs -f event-display-6496b6c66d-7drk5
```

2 PingSource → Knative Service Sink

架构

示例2

部署一个kservice类型的sink，这里面还是以event-display为例，下面是资源清单

---
apiVersion: serving.knative.dev/v1
kind: Service
metadata:
  name: event-display
spec:
  template:
    metadata:
      annotations:
        autoscaling.knative.dev/min-scale: "1"
    spec:
      containers:
        - image: ikubernetes/event_display
          ports:
            - containerPort: 8080

定义pingsource资源，指定sink为event-display

---
apiVersion: sources.knative.dev/v1
kind: PingSource
metadata:
  name: pingsource-00001
spec:
  schedule: "* * * * *"
  contentType: "application/json"
  data: '{"message": "Hello Eventing!"}'
  sink:
    ref:
      apiVersion: serving.knative.dev/v1
      kind: Service
      name: event-display

获取event-display当中的日志信息，验证是否进行了事件发送
```
kubectl logs -f event-display-00001-deployment-7f488cb57b-grsc6
```

3 ContainerSource → Knative Service Sink

旨在收集一些容器的event是，比如容器的一些元数据，下面是架构：

示例2

部署一个kservice类型的sink，这里面还是以event-display为例，下面是资源清单

---
apiVersion: serving.knative.dev/v1
kind: Service
metadata:
  name: event-display
spec:
  template:
    metadata:
      annotations:
        autoscaling.knative.dev/min-scale: "1"
    spec:
      containers:
        - image: ikubernetes/event_display
          ports:
            - containerPort: 8080

定义containergsource资源，指定sink为event-display

apiVersion: sources.knative.dev/v1
kind: ContainerSource
metadata:
  name: containersource-heartbeat
spec:
  template:
    spec:
      containers:
        - image: ikubernetes/containersource-heartbeats:latest
          name: heartbeats
          env:
          - name: POD_NAME
            valueFrom:
              fieldRef:
                fieldPath: metadata.name
          - name: POD_NAMESPACE
            valueFrom:
              fieldRef:
                fieldPath: metadata.namespace
  sink:
    ref:
      apiVersion: serving.knative.dev/v1
      kind: Service
      name: event-display

在event-display的名称空间创建了一个containersource的pod

在这里插入图片描述

获取event-display当中的日志信息，验证是否进行了事件发送
```
kubectl logs -f event-display-00001-deployment-645944b779-2b4vt
```

4 ApiServerSource → Knative Service Sink

apiserversource主要记录了aoiserver上的event，比如create/delete/update/get，架构如下：

示例4：

部署一个kservice类型的sink，这里面还是以event-display为例，下面是资源清单

---
apiVersion: serving.knative.dev/v1
kind: Service
metadata:
  name: event-display
spec:
  template:
    metadata:
      annotations:
        autoscaling.knative.dev/min-scale: "1"
    spec:
      containers:
        - image: ikubernetes/event_display
          ports:
            - containerPort: 8080

定义ServiceAccount：定义向指定目标资源的get,watch,list的相关权限

apiVersion: v1
kind: ServiceAccount
metadata:
  name: pod-watcher
---
apiVersion: rbac.authorization.k8s.io/v1
kind: Role
metadata:
  name: pod-reader
rules:
- apiGroups:
  - ""
  resources:
  - pods
  verbs:
  - get
  - list
  - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: RoleBinding
metadata:
  name: pod-reader
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: Role
  name: pod-reader
subjects:
- kind: ServiceAccount
  name: pod-watcher

定义apiserversource资源，结合serviceaccount，对指定权限的pod进行收集event

apiVersion: sources.knative.dev/v1
kind: ApiServerSource
metadata:
  name: pods-event
spec:
  serviceAccountName: pod-watcher
  mode: Reference
  resources:
  - apiVersion: v1
    kind: Pod
  sink:
    ref:
      apiVersion: serving.knative.dev/v1
      kind: Service
      name: event-display

会发现创建一个apiserversource的pod

在这里插入图片描述

获取event-display当中的日志信息，验证是否进行了事件发送
```
kubectl logs -f event-display-00001-deployment-9469968cd-vb4l2 
```

5 GitLab Source

关于GitLabSource
- 将GitLab仓库上的事件转为CloudEvents
- GitLabSource为指定的事件类型创建一个Webhook，监听传入的事件，并将其传给消费者
GitLabSource支持的事件类型包括如下这些：
- 推送事件：push_events
  - 对应的CloudEvents的类型为“dev.knative.sources.gitlab.push”，以下类同
- tag推送事件：tag_push_events
- 议题事件：issues_events
- 合并请求事件：merge_requests_events
- 私密议题事件：confidential_issues_events
- 私密评论：confidential_note_events
- 部署事件：deployment_events
- 作业事件：job_events
- 评论：note_events
- 流水线事件：pipeline_events
- Wiki页面事件：wiki_page_events

5.1 GitLab Source 实践

示例环境说明
- 一个部署可用的GitLab服务
- GitLab服务上隶于某个用户（例如root）的代码仓库（例如myproject）
- 负责接收CloudEvents的kservice/event-display
具体步骤
- 部署Gitlab
- GitLab上的操作
  - 为GitLab用户设置Personal Access Token
  - 准备示例仓库myproject
- 在Knative上部署GitLabSource
- 在Knative上部署KService/event-display
- 创建Secret资源，包含两个数据项
  - GitLab上的Personal Access Token
  - GitLab调用GitLabSource与Webhook Secret
- 创建GitLabSource资源
  - 从GitLab仓库加载事件
  - 将事件转为CloudEvents，并发往Sink
具体操作
- 部署GitLab
- Gitlab上操作
  - 通用→可见性：设定“自定义HTTP(S)协议Git克隆URL”