新增learn-kubernetes（https://github.com/yyong-brs/learn-kubernetes）相关文件

learn/learn-kubernetes-master/kiamol/ch21/functions/hello-kiamol/hello-kiamol.java

@@ -0,0 +1,10 @@
+package io.kubeless;
+
+import io.kubeless.Event;
+import io.kubeless.Context;
+
+public class Kiamol {
+    public String hello(io.kubeless.Event event, io.kubeless.Context context) {
+        return "Hello from chapter 21!";
+    }
+}

learn/learn-kubernetes-master/kiamol/ch21/functions/todo-api/ingress/ingress.yaml

@@ -0,0 +1,20 @@
+apiVersion: networking.k8s.io/v1beta1 
+kind: Ingress
+metadata:
+  name: todo-api
+  labels:
+    kiamol: ch21
+spec:
+  rules:
+  - host: api.todo.kiamol.local
+    http:
+      paths:
+      - path: /todos
+        backend:
+          serviceName: todo-api
+          servicePort: 8080
+
+# this spec is equivalent to running 
+# kubeless trigger http create todo-api --function-name todo-api --path todos --hostname api.todo.kiamol.local
+# but that fails with Kubeless 1.0.7 running on Kubernetes 1.18 - see
+# https://github.com/kubeless/kubeless/issues/1130

learn/learn-kubernetes-master/kiamol/ch21/functions/todo-api/package.json

@@ -0,0 +1,11 @@
+{
+    "name": "todo-api",
+    "version": "0.1.0",
+    "main": "server.js",
+    "author": "kiamol",
+    "dependencies": {
+      "nats" : "1.4.9",
+      "uuid" : "8.2.0"
+    }
+}
+  

learn/learn-kubernetes-master/kiamol/ch21/functions/todo-api/server.js

@@ -0,0 +1,21 @@
+const NATS = require('nats')
+const nc = NATS.connect({url: 'nats://message-queue:4222', json: true})
+const { v4: uuidv4 } = require('uuid');
+
+function handler(event, context) {
+  console.log('** todo-api handler called');
+  
+  var newItemEvent = {
+    Subject: "events.todo.newitem",
+    Item: {
+      Item: event.data,
+      DateAdded: new Date().toISOString()
+    },
+    CorrelationId: uuidv4()
+  }
+
+  nc.publish('events.todo.newitem', newItemEvent)
+  console.log(`** New item published, event ID: ${newItemEvent.CorrelationId}`);
+}
+
+module.exports = { handler }

learn/learn-kubernetes-master/kiamol/ch21/functions/todo-audit/audit.py

@@ -0,0 +1,3 @@
+
+def handler(event, context):    
+    print(f"AUDIT @ {event['data']['Item']['DateAdded']}: {event['data']['Item']['Item']}")

learn/learn-kubernetes-master/kiamol/ch21/functions/todo-mutating-handler/cronjob-trigger.yaml

@@ -0,0 +1,15 @@
+apiVersion: kubeless.io/v1beta1
+kind: CronJobTrigger
+metadata:
+  finalizers:
+  - kubeless.io/cronjobtrigger 
+  labels:
+    created-by: kubeless
+  name: todo-mutating-handler
+  namespace: default
+spec:
+  function-name: todo-mutating-handler
+  schedule: '*/1 * * * *'
+
+# finalizers help with clean-up tasks - see
+# https://kubernetes.io/docs/tasks/extend-kubernetes/custom-resources/custom-resource-definitions/#finalizers

learn/learn-kubernetes-master/kiamol/ch21/functions/todo-mutating-handler/mutating-handler.yaml

@@ -0,0 +1,28 @@
+apiVersion: kubeless.io/v1beta1
+kind: Function
+metadata:
+  name: todo-mutating-handler
+  namespace: default
+  label:
+    created-by: kubeless
+spec:
+  runtime: php7.3
+  timeout: "10"
+  handler: todo-mutating-handler.mutate  
+  deps: ""
+  function-content-type: text
+  function: |
+    <?php
+
+      function mutate($event, $context) {
+        fwrite(STDOUT, '* Mutating handler called.');
+        $conn = pg_connect('host=todo-db dbname=todo user=postgres password=kiamol-2*2*');
+        if (!$conn) {
+          echo 'Connection failed';
+          exit;
+        }
+        $sql = 'UPDATE "public"."ToDos" SET "Item"=\'Leave a nice review for KIAMOL :)\'';
+        $result = pg_query($conn, $sql); 
+        fwrite(STDOUT, '* Mutation complete.');
+        return "* Mutated...";
+      }