I have a python program, which will make some api calls and print some output depending upon the api's response. I am using flush = true argument in the print function call. Sometimes the python program looks hung (It won't print anything to the terminal). But when i press CTRL-C, some output is printed to the output and python (looks to)resumes again. I have not written any signal handler for SIGINT. Why is this behavior?
UPDATE (Added python code)
import requests
import config
import json
from ipaddress import IPv4Address, IPv4Network
ip_list = []
filepath = "ip_address_test.txt"
with open(filepath) as fp:
line = fp.readline()
ip_list.append(line.rstrip())
while line:
line = fp.readline()
ip_list.append(line.rstrip())
print(ip_list)
del ip_list[-1]
sysparm_offset = 0
sysparm_limit = 2
flag = 1
for ip in ip_list:
hosts = []
while flag == 1:
print("ip is "+str(ip), flush=True)
# Set the request parameters
url = 'https://xxx.service-now.com/api/now/table/u_cmdb_ci_subnet?sysparm_query=u_lifecycle_status!=end of life^GOTOname>='+ip+'&sysparm_limit='+str(sysparm_limit)+'&sysparm_offset='+str(sysparm_offset)
# Eg. User name="username", Password="password" for this code sample.
user = config.asknow_username
pwd = config.asknow_password
headers = {"Accept":"application/json"}
# Do the HTTP request
response = requests.get(url, auth=(user, pwd), headers=headers,verify=False)
# Check for HTTP codes other than 200
if response.status_code != 200:
print('Status:', response.status_code, 'Headers:', response.headers, 'Error Response:', response.content)
exit()
# Decode the json response into a dictionary and use the data
result = json.loads(response.content)['result']
iter = 0
while iter < sysparm_limit:
print("iter = "+str(iter),flush=True)
print("checking "+result[iter]["name"], flush=True)
id = result[iter]["u_guid"]
url = "https://xxx.service-now.com/api/now/cmdb/instance/u_cmdb_ci_subnet/" + str(id)
response = requests.get(url, auth=(user, pwd), headers=headers,verify=False)
# Check for HTTP codes other than 200
if response.status_code != 200:
print('Status:', response.status_code, 'Headers:', response.headers, 'Error Response:', response.content)
exit()
result1 = json.loads(response.content)['result']
for relation in result1["outbound_relations"]:
if relation["type"]["display_value"] == "IP Connection::IP Connection":
if IPv4Address(relation["target"]["display_value"]) in IPv4Network(ip):
print("appending host", flush=True)
hosts.append(relation["target"]["display_value"])
else:
print("ip not in subnet", flush=True)
flag = 0
break
if flag == 0:
break
iter = iter+1
sysparm_offset = sysparm_offset + 2
with open('output.txt',"a+") as output_file:
for value in hosts:
output_file.write(str(value)+"\n")
print("completed "+ip,flush=True)
flag = 1
