adapter-pattern

Author: vinsguru

kubernetes/adapter-pattern/db.json

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+{
+   "cars":[
+      {
+         "id":1,
+         "make":"honda",
+         "model": "civic",
+         "topSpeed" : 60
+      },
+      {
+         "id":2,
+         "make":"honda",
+         "model": "accord",
+         "topSpeed" : 80
+      },
+      {
+         "id":3,
+         "make":"nissan",
+         "model": "370z",
+         "topSpeed" : 100
+      }
+   ]
+}

kubernetes/adapter-pattern/default.conf

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+upstream backend  {
+  server localhost;
+}
+
+server {
+
+    listen 8080;
+
+    default_type application/json;
+
+    location /cars_backend {
+        internal;
+        proxy_pass http://backend$request_uri;
+        proxy_redirect off;
+    }
+
+	location /cars {
+
+	 	content_by_lua_block {
+
+	 		-- forward to backend
+		    local a = ngx.location.capture("/cars_backend")
+
+		    -- convert to diff unit
+		    local func = function (v)
+				return '"topSpeed": ' .. v[1] * 1.6;
+			end
+
+			-- find a match and replace
+		    local newstr, n, err = ngx.re.sub(a.body, '"topSpeed": ([0-9]+)', func)
+
+		    -- final response
+		    ngx.say(newstr)
+
+	 	}
+	}
+
+}

kubernetes/adapter-pattern/deployment.yaml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    app: car-service
+  name: car-service
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: car-service
+  template:
+    metadata:
+      labels:
+        app: car-service
+    spec:
+      containers:
+      - image: openresty/openresty:alpine
+        name: car-adapter
+        ports:
+        - containerPort: 8080
+        volumeMounts:
+        - name: conf
+          mountPath: /etc/nginx/conf.d/     
+      - image: clue/json-server
+        name: car-service
+        ports:
+        - containerPort: 80
+        volumeMounts:
+        - name: db
+          mountPath: /data/
+      volumes:
+      - name: db
+        configMap:
+          name: carsdb
+      - name: conf
+        configMap:
+          name: nginxconf    

kubernetes/adapter-pattern/service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    app: car-service
+  name: car-service
+spec:
+  ports:
+  - name: 8080-80
+    port: 8080
+    protocol: TCP
+    targetPort: 80
+  - name: 8081-80
+    port: 8081
+    protocol: TCP
+    targetPort: 8080
+  selector:
+    app: car-service
+  type: LoadBalancer