How to resolve Json decode error in Ubuntu - json

Question

I am running python script on Window 10.
In the python script, I am using json library.
When I run the same script on Ubuntu 20.04(running on VMware), I do see json decode error happening.
This behaviour I dont see when I run in Windows 10.
The following is the error I do get when I run the script in Ubuntu
Exception in thread Thread-1:
Traceback (most recent call last):
File "/usr/lib/python3.8/threading.py", line 932, in _bootstrap_inner
self.run()
File "/usr/lib/python3.8/threading.py", line 870, in run
self._target(*self._args, **self._kwargs)
File "uiControl.py", line 83, in getTcpData
self.taskObj = json.loads(data.decode('utf-8'))
File "/usr/lib/python3.8/json/__init__.py", line 357, in loads
return _default_decoder.decode(s)
File "/usr/lib/python3.8/json/decoder.py", line 340, in decode
raise JSONDecodeError("Extra data", s, end)
json.decoder.JSONDecodeError: Extra data: line 5 column 2 (char 73)
In function on_message, I am printing the data received.
The following is the data I receive :
b'{"code":"101","user":"ssmr","evNumber":"TS15EC1100"}'
I call the function addToTaskQueue() to store the received data and then try to parse the data using function BackendParser()
def on_message(self,client, userdata, msg):
print(msg.payload)
self.taskObj = json.loads(msg.payload )
self.taskObj["commType"]= "mqtt"
self.taskObj["transactionType"]= "rx"
taskScheduler.addToTaskQueue(self.taskObj)
def BackendParser(msg):
if(msg["code"] == "101"):
Backend.userName = msg["user"]
Backend.evNumber = msg["evNumber"]
Backend.evChargeControl = "On"
if(Backend.requestStatus == ""):
Backend.requestStatus = "new"
class taskScheduler():
global qTaskList
qTaskList = queue.Queue()
def __init__(self):
super().__init__()
self.tcpCon = tcpServerClient("client")
self.mqttCon = mqttComm()
print("Initiated Task Scheduler class")
#staticmethod
def addToTaskQueue(item):
if not qTaskList.full():
#print("Task added")
qTaskList.put(item)
def executeFromTaskQueue(self):
if not qTaskList.empty():
item = qTaskList.get()
if("mqtt" == item["commType"]):
if("tx" == item["transactionType"]):
pubTopic = item["topic"]
del item["commType"]
del item["transactionType"]
del item["topic"]
self.mqttCon.mqttSend(item,pubTopic)
elif("rx" == item["transactionType"]):
BackendParser(item)
elif("tcp" == item["commType"]):
if("tx" == item["transactionType"]):
del item["commType"]
del item["transactionType"]
tcpServerClient.sendTcpData(item)
elif("rx" == item["transactionType"]):
BackendParser(item)

Answer 1

I figured out the error
I was using the following function getTcpData to receive the data.
I tried printing the data as received and noticed that there were \n characters in the message received.This was not issue when the script was executed in Windows 10. I now added the routine to remove the \n character and now it works fine in Ubuntu.
def getTcpData(self):
print("Waiting for tcp data")
while True:
if(tcpServerClient.clientsocket != None):
data=tcpServerClient.clientsocket.recv(1024)
if data:
print(data)
self.taskObj = json.loads(data.decode('utf-8'))
self.taskObj["commType"]= "tcp"
self.taskObj["transactionType"]= "rx"
taskScheduler.addToTaskQueue(self.taskObj)