def process_request(self, message: str) -> str:
"""Processes HTTP request and returns response."""
parser = HTTPParser()
response = HTTPResponse()
calc = Calculator()
request = parser.parse_request(message)
# Invalid request (no expression sent)
if (not request["params"] or "expression" not in request["params"]):
print("Request is invalid. Missing parameters.")
return response.build_response(status=406, data="-1")
expression = request["params"]["expression"][0]
print("{}Expression received:{} {}".format(bcolors.OKBLUE,
bcolors.ENDC, expression))
# Evaluate the expression
try:
result = calc.evaluate(expression)
print("{}Expression valid{}, result = {}".format(
bcolors.OKGREEN, bcolors.ENDC, result))
return response.build_response(status=200, data=result)
# Send error message if not valid
except Exception as exc:
print("{}An exception occurred:{} {} ({})".format(
bcolors.FAIL, bcolors.ENDC, str(exc),
type(exc).__name__))
return response.build_response(status=406, data="-1")
return ""
print()
if exp == "exit":
break
request = http_req.build_request(method="POST", params={"expression": exp})
print("{}Making HTTP request...{}".format(bcolors.OKGREEN, bcolors.ENDC))
print("----------------------")
print(request, "\n")
print("{}Evaluating expression...{}".format(bcolors.OKGREEN, bcolors.ENDC))
print("------------------------")
try:
result = calc.evaluate(exp)
print("Calculation result:", result, "\n")
print("{}Retrieving HTTP response...{}".format(bcolors.OKGREEN,
bcolors.ENDC))
print("---------------------------")
response = http_resp.build_response(status=200, data=result)
print(response, "\n")
except Exception as ex:
print(
"An exception occurred: {} ({}).".format(str(ex),
type(ex).__name__), "\n")
from calc import Calculator, OperationIncomplete, InvalidOperation, NotAnInteger
calc = Calculator()
print(calc.evaluate("+ 1 2"))
print(calc.evaluate("/ 12 3"))
try:
print(calc.evaluate("/ 2 0"))
except ZeroDivisionError as e:
print(str(e))
print(calc.evaluate("+ 2 3 4"))
try:
print(calc.evaluate("* 2"))
except OperationIncomplete as e:
print(str(e))
try:
print(calc.evaluate("& 2 3"))
except InvalidOperation as e:
print(str(e))
try:
print(calc.evaluate("/ 2 3.4"))
except NotAnInteger as e:
print(str(e))
