Database server.

key-pair-client.py

import requests

class ServerRequest:
    def __init__(self, host, port):
        self.address = '{}:{}'.format(host, port)

    def _get(self, key):
        request = '{0}/get?key={1}'.format(self.address, key)
        response = requests.get(request)
        if response.status_code == 200:
                print(response.text)
        elif response.status_code == 404:
            print("Value for specified key does not exist!")
        else:
            print("Request could not be successfully fulfilled")
            
    def _post(self, key, value):
        request = '{0}/set?{1}={2}'.format(self.address, key, value)
        response = requests.post(request)
        if response.status_code == 200:
            print("Key-Value pair successfully stored!")
        else:
            print("Key-Value pair was not successfully stored!")

if __name__ == "__main__":
    client = ServerRequest('http://localhost', '4000')
    client._post("One", "Cow")
    client._post("Two", "Dog")
    client._get("Two")
    client._get("Ten")

key-pair-server.py

from http.server import HTTPServer, BaseHTTPRequestHandler
from urllib.parse import urlparse, parse_qs

pairs = []

class KeyPairServer(BaseHTTPRequestHandler):
    def set_headers(self, code):
        self.send_response(code)
        self.send_header("Content-Type", "application/json")
        self.end_headers()

    def do_GET(self):
        params = parse_qs(self.path[5:])
        requested = ''.join(params["key"])
        value = self.get_value(requested)
        if value is not None:
            value = ''.join(value)
            self.set_headers(200)
            self.wfile.write(value.encode("utf-8"))
        else:
            self.set_headers(404)
    
    def get_value(self, requested):
        value = None
        for i in range(len(pairs)):
            for key in pairs[i]:
                if key == requested:
                    value = pairs[i][key]
        return value

    def do_POST(self):
        path = dict(parse_qs(self.path[5:]))
        pairs.append(path)
        self.set_headers(200)
        

def main():
    server = HTTPServer(('localhost', 4000), KeyPairServer)
    server.serve_forever()

if __name__ == "__main__":
    main()