Created
December 25, 2018 06:46
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Simple Python 3 HTTP server that can store one key-value pair per request, as given in query string.
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| #!/usr/bin/python3 | |
| from http.server import BaseHTTPRequestHandler, HTTPServer | |
| from urllib.parse import urlparse, parse_qs | |
| import json | |
| HOST_NAME = "" | |
| HOST_PORT = 4000 | |
| WRITE_SUCCESS_TEMPLATE = "Key '{}' now storing value '{}'" | |
| WRITE_FAILURE_TEMPLATE = "Unable to store key '{}' and value '{}'" | |
| FETCH_SUCCESS_TEMPLATE = "Successfully fetched value for key '{}'" | |
| FETCH_FAILURE_TEMPLATE = "Unable to find key '{}'" | |
| UNKNOWN_METHOD_TEMPLATE = "Unknown method: '{}'" | |
| key_value_store = {} | |
| class SimpleServer(BaseHTTPRequestHandler): | |
| def __init__(self, *args, **kwargs): | |
| super().__init__(*args, **kwargs) | |
| def write_key(self, key, value): | |
| try: | |
| key_value_store[key] = value | |
| message = WRITE_SUCCESS_TEMPLATE.format(key, value) | |
| except KeyError: | |
| message = WRITE_FAILURE_TEMPLATE.format(key, value) | |
| return message | |
| def fetch_key(self, key): | |
| try: | |
| result = key_value_store[key] | |
| message = FETCH_SUCCESS_TEMPLATE.format(key) | |
| except KeyError: | |
| result = None | |
| message = FETCH_FAILURE_TEMPLATE.format(key) | |
| return message, result | |
| def return_simple_json(self, message, result=None): | |
| response = { | |
| "data": { | |
| "message": message, | |
| "result": result | |
| } | |
| } | |
| response_bytes = bytes(json.dumps(response), "utf-8") | |
| self.send_response(200) | |
| self.send_header('Content-type', 'text/json') | |
| self.end_headers() | |
| self.wfile.write(response_bytes) | |
| def do_GET(self): | |
| request = urlparse(self.path) | |
| query_string_data = parse_qs(request.query) | |
| result = None | |
| if query_string_data: | |
| name, value = query_string_data.popitem() | |
| if request.path == "/set/": | |
| message = self.write_key(name, value[0]) | |
| elif request.path == "/get/": | |
| message, result = self.fetch_key(value[0]) | |
| else: | |
| message = UNKNOWN_METHOD_TEMPLATE.format(request.path) | |
| response = self.return_simple_json(message, result) | |
| if __name__ == '__main__': | |
| my_server = HTTPServer((HOST_NAME, HOST_PORT), SimpleServer) | |
| try: | |
| print("server started") | |
| my_server.serve_forever() | |
| except KeyboardInterrupt: | |
| print("unable to start server") | |
| my_server.server_close() | |
| print("server terminated") |
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