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Author: inemov

Dockerfile

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+# syntax=docker/dockerfile:1
+# set base image
+FROM python:3.8-slim
+# set the working directory in the container
+WORKDIR /app
+# copy the dependencies list to the working directory
+COPY requirements.txt .
+# install dependencies
+RUN pip3 install -r requirements.txt
+# copy content of the source code folder to the working directory
+COPY src/ .
+# run on container start
+CMD ["python3", "./app.py"]
+

deployment.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: math-api-service
+spec:
+  type: NodePort
+  selector:
+    app: math-api
+  ports:
+  - port: 8000
+    targetPort: 5005
+    nodePort: 30008
+---
+
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: math-api
+spec:
+  selector:
+    matchLabels:
+      app: math-api
+  replicas: 4
+  template:
+    metadata:
+      labels:
+        app: math-api
+    spec:
+      containers:
+      - name: math-api
+        image: math-api
+        imagePullPolicy: IfNotPresent
+        ports:
+        - containerPort: 5005

requirements.txt

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+Flask==2.1.2
+waitress==2.1.2

src/app.py

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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Created on Sun Jun  5 22:01:11 2022
+
+@author: Ivan Nemov
+"""
+
+
+from flask import Flask, request, jsonify
+from waitress import serve
+import json
+
+
+def createApp():
+    """
+    Flask Application
+    """
+    app = Flask(__name__)
+
+    @app.route('/', methods=['GET'])
+    def index():
+        """
+        API index page
+        """
+        return 'Test Flask-based Web API with math functions.'
+
+    @app.route('/square', methods=['POST'])
+    def square():
+        """
+        Return square of posted number
+        """
+        req = request.get_json()
+        if (not req):
+            return 'JSON is incorrect.'
+
+        # check payload
+        try:
+            payload = json.loads(req)
+        except:
+            payload = None
+        
+        # if not provided
+        if (not payload):
+            return 'JSON is empty.'
+
+        # calculate square
+        try:
+            res = pow(float(payload['val']), 2)
+        except:
+            return 'Value is not provided or cannot be casted to float type.'
+
+        return jsonify({'res': res})
+
+    return app
+
+
+if __name__ == '__main__':
+    """
+    Entry point
+    """
+    app = createApp()
+
+    # start web server
+    serve(app, host="0.0.0.0", port=5005)

test/request_api.py

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+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Created on Sun Jun  5 22:01:11 2022
+
+@author: Ivan Nemov
+"""
+
+
+import requests
+import json
+
+# prepare
+base_url = 'http://127.0.0.1'
+port = '8000'
+route = '/square'
+final_url = (':'.join([base_url, port]) if port != '' else base_url) + route
+payload = json.dumps({'val': 3.56})
+
+# get response on request
+response = requests.post(final_url, json = payload, timeout = 2)
+res = json.loads(response.text)
+response.close()
+
+# show results
+print('Result: ')
+print(res['res'])
+print('\n')
+
+print('Response code and reason: ')
+print(response.status_code, response.reason)