def test_ErrorMaxFetchAttemptsExceeded():
'''Test the class ErrorMaxFetchAttemptsExceeded (error when maximum fetch attempts has been exceeded)'''
# This file is not created, just a tmp path
test_ID = '123456789'
# Test instantiation
test_error = NCBImetaErrors.ErrorMaxFetchAttemptsExceeded(test_ID)
# Test str representation (error message)
error_output = str(test_error)
error_expect = ("\n\nThe Maximum number of fetch attempts was exceeded for ID:" + "\n" + test_ID)
assert error_output == error_expect
def HTTPErrorCatch(http_method, max_fetch_attempts, sleep_time, **kwargs):
'''
Return result of http_method and check if an HTTP Error is generated
Parameters:
http_method (function): An http record-fetching or searching method.
max_fetch_attempts (int): Maximum number of tries for fetching a record_dict.
sleep_time (float): Number of seconds to wait in between fetch read_attempts.
kwargs(dict): keyword arguments for the http_method function.
'''
# Attemp the http_method function, wrapped in HTTP error checking
ID_handle_retrieved = False
fetch_attempts = 0
while not ID_handle_retrieved and fetch_attempts < max_fetch_attempts:
try:
ID_handle = http_method(**kwargs)
ID_handle_retrieved = True
# HTTP Errors
except urllib.error.HTTPError as error:
# Error code 429: Too Many Requests
if error.code == 429:
fetch_attempts += 1
print("HTTP Error " + str(error.code) + ": " +
str(error.reason))
print("Fetch Attempt: " + str(fetch_attempts) + "/" +
str(max_fetch_attempts))
print("Sleeping for " + str(sleep_time) +
" seconds before retrying.")
time.sleep(sleep_time)
# General HTTP Error Code, non specific
else:
fetch_attempts += 1
print("HTTP Error " + str(error.code) + ": " +
str(error.reason))
print("Fetch Attempt: " + str(fetch_attempts) + "/" +
str(max_fetch_attempts))
print("Retrying record fetching.")
# URL Errors
except urllib.error.URLError as error:
fetch_attempts += 1
print("URL Error: " + str(error.reason))
print("Fetch Attempt: " + str(fetch_attempts) + "/" +
str(max_fetch_attempts))
print("Retrying record fetching.")
# If the maximum number of fetch attempts has been exceeded
if fetch_attempts == max_fetch_attempts and not ID_handle_retrieved:
raise NCBImetaErrors.ErrorMaxFetchAttemptsExceeded(ID)
return ID_handle