NameError: name 'THROW_EXCEPTION_ON_ERROR' is not defined

[sunnyking]

Traceback (most recent call last):
File "/home/ubuntu/.local/share/virtualenvs/gemmer-q4Xooie9/lib/python3.7/site-packages/pyvsystems/account.py", line 62, in balance
resp = self.wrapper.request('/addresses/balance/%s%s' % (self.address, confirmations_str))
File "/home/ubuntu/.local/share/virtualenvs/gemmer-q4Xooie9/lib/python3.7/site-packages/pyvsystems/wrapper.py", line 36, in request
return requests.get(url, headers=headers, timeout=self.timeout).json()
File "/home/ubuntu/.local/share/virtualenvs/gemmer-q4Xooie9/lib/python3.7/site-packages/requests/models.py", line 900, in json
return complexjson.loads(self.text, **kwargs)
File "/usr/lib/python3.7/json/init.py", line 348, in loads
return _default_decoder.decode(s)
File "/usr/lib/python3.7/json/decoder.py", line 337, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib/python3.7/json/decoder.py", line 355, in raw_decode
raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "main.py", line 409, in
loop.run_until_complete(GemmerApp().execute())
File "/usr/lib/python3.7/asyncio/base_events.py", line 579, in run_until_complete
return future.result()
File "main.py", line 402, in run_wrapper
await self.async_run(async_lib='asyncio')
File "/home/ubuntu/.local/share/virtualenvs/gemmer-q4Xooie9/lib/python3.7/site-packages/kivy/app.py", line 962, in async_run
await async_runTouchApp(async_lib=async_lib)
File "/home/ubuntu/.local/share/virtualenvs/gemmer-q4Xooie9/lib/python3.7/site-packages/kivy/base.py", line 605, in async_runTouchApp
await EventLoop.async_mainloop()
File "/home/ubuntu/.local/share/virtualenvs/gemmer-q4Xooie9/lib/python3.7/site-packages/kivy/base.py", line 362, in async_mainloop
await self.async_idle()
File "/home/ubuntu/.local/share/virtualenvs/gemmer-q4Xooie9/lib/python3.7/site-packages/kivy/base.py", line 426, in async_idle
await Clock.async_tick()
File "/home/ubuntu/.local/share/virtualenvs/gemmer-q4Xooie9/lib/python3.7/site-packages/kivy/clock.py", line 740, in async_tick
self.post_idle(ts, current)
File "/home/ubuntu/.local/share/virtualenvs/gemmer-q4Xooie9/lib/python3.7/site-packages/kivy/clock.py", line 776, in post_idle
self._process_events()
File "kivy/_clock.pyx", line 616, in kivy._clock.CyClockBase._process_events
File "kivy/_clock.pyx", line 649, in kivy._clock.CyClockBase._process_events
File "kivy/_clock.pyx", line 645, in kivy._clock.CyClockBase._process_events
File "kivy/_clock.pyx", line 218, in kivy._clock.ClockEvent.tick
File "/home/ubuntu/Github/virtualeconomy/gemmer/gui/tasks.py", line 101, in _execute
balance = app.balance()
File "main.py", line 372, in balance
response = self.wallet.balance() # fetch address balance
File "/home/ubuntu/Github/virtualeconomy/gemmer/gemmer/wallet.py", line 211, in balance
return self.COIN.client.balance(self.address())
File "/home/ubuntu/Github/virtualeconomy/gemmer/gemmer/vnode.py", line 48, in balance
"confirmed": AccountV(chain=self.CHAIN, address=address).balance(),
File "/home/ubuntu/.local/share/virtualenvs/gemmer-q4Xooie9/lib/python3.7/site-packages/pyvsystems/account.py", line 66, in balance
throw_error(msg, NetworkException)
File "/home/ubuntu/.local/share/virtualenvs/gemmer-q4Xooie9/lib/python3.7/site-packages/pyvsystems/error.py", line 54, in throw_error
if THROW_EXCEPTION_ON_ERROR:
NameError: name 'THROW_EXCEPTION_ON_ERROR' is not defined

[sunnyking]

height() call can let JSONDecodeError raise correctly
balance() call hit NameError instead
pyvsystems 0.2.1

[sunnyking]

Another thing, the JSONDecodeError in this case, can also be avoided by checking the http response code and mime type before attempting json decode. Successful response is like:

HTTP request sent, awaiting response... 200 OK
Length: 25 [application/json]

while in this occurrence:

--2021-01-14 16:37:03--  https://test.v.systems/api/blocks/height
Connecting to test.v.systems (test.v.systems)|104.26.9.50|:443... connected.
HTTP request sent, awaiting response... 502 Bad Gateway
2021-01-14 16:37:04 ERROR 502: Bad Gateway.