OSX: json.decoder.JSONDecodeError

[Lajoix]

Hey,

I'm new to the krakenex API, i'm trying to do the following

import krakenex
import time

class krakencom():
    def __init__(self):
        self.k = krakenex.API(key='abc',secret="def")

    def getEthEur(self):
        self.etheur = self.k.query_public('Ticker', {'pair': 'ETHEUR'})["result"]['XETHZEUR']
        return self.etheur

    def lowestPrice(self, cur):
        lowestPrice = cur['l']
        return lowestPrice

    def highestPrice(self, cur):
        highestPrice = cur['h']
        return highestPrice

    def volume24h(self, cur):
        volume24h = cur['v'][1]
        return volume24h

    def lastTrade(self, cur):
        lastTrade = cur['c']
        return lastTrade


krak = krakencom()
while True:
    eth = krak.getEthEur()
    print(krak.lastTrade(eth))
    time.sleep(0.5)

the out put is

[‘RESULT', 'RESULT]

and after a while ERROR !!!?!
The error happens randomly from the second query

Traceback (most recent call last):
  File "/Users/MYUSER/MYDIR/MYPROJECT/krakapi.py", line 32, in <module>
    eth = krak.getEthEur()
  File "/Users/MYUSER/MYDIR/MYPROJECT/krakapi.py", line 10, in getEthEur
    self.etheur = self.k.query_public('Ticker', {'pair': 'ETHEUR'})["result"]['XETHZEUR']
  File "/usr/local/lib/python3.6/site-packages/krakenex/api.py", line 148, in query_public
    return self._query(urlpath, req, conn)
  File "/usr/local/lib/python3.6/site-packages/krakenex/api.py", line 131, in _query
    return json.loads(ret)
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/__init__.py", line 354, in loads
    return _default_decoder.decode(s)
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/decoder.py", line 339, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/json/decoder.py", line 357, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

i'm on OSX 10.11.6 python 3.6.1

many thanks

lj

[veox]

i'm trying to do the following

Do describe (not in code) on what it is you're trying to do - the code shows what you're actually doing.

What is the output of krakenex.version.__version__?

Tentatively an issue with OSX decoding the JSON?.. I.e., system-related, not package-related.

Other than that, the code is likely to fail - in krakencom(), you're accessing cur['c'], where cur is the query response received previously from getEthEur()... As far as I remember, the response doesn't have a 'c' key.

[veox]

Does the (updated) depth.py example give this error? (If so, post it here.)

[jacob-roth]

I've been getting this too. Using Mac Sierra 10.12.5, Python3.5, krakenex 0.1.4.

Background on my problem: I'm trying to pull all ticker data for all assetpairs at a particular time. I initialize the API as k and use k.query_public(method="Ticker", req={"pair":pair}) for each pair in a list of assetpairs. Sometimes when I run the request on the entire list of 64 assetpairs (from DASHEUR to XZECZUSD), I receive the following error:

Traceback (most recent call last):
.
.
.
  File "/Users/MYUSER/anaconda/envs/python3/lib/python3.5/site-packages/krakenex/api.py", line 148, in query_public
    return self._query(urlpath, req, conn)
  File "/MYUSER/anaconda/envs/python3/lib/python3.5/site-packages/krakenex/api.py", line 131, in _query
    return json.loads(ret)
  File "/Users/MYUSER/anaconda/envs/python3/lib/python3.5/json/__init__.py", line 319, in loads
    return _default_decoder.decode(s)
  File "/Users/MYUSER/anaconda/envs/python3/lib/python3.5/json/decoder.py", line 339, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/Users/MYUSER/anaconda/envs/python3/lib/python3.5/json/decoder.py", line 357, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

As an aside, the issue of c as a key should be fine according to Kraken's API:

<pair_name> = pair name
a = ask array(, , ),
b = bid array(, , ),
c = last trade closed array(, ),
v = volume array(, <last 24 hours>),
p = volume weighted average price array(, <last 24 hours>),
t = number of trades array(, <last 24 hours>),
l = low array(, <last 24 hours>),
h = high array(, <last 24 hours>),
o = today's opening price

and from my testing of the c key with ticker data, it works except for the above error.

[veox]

@jacob-roth See if PR #17 helps with what you describe.

It's available in current master, and release v1.0.0a0 (not on PyPI, though, since alpha).

---

EDIT: shorten, said wrong version

[veox]

In short: the error probably stems from krakenex not (previously) handling a connection error, and passing bogus (non-JSON) response from Connection to API.

Closing as stale.

Request reopen, or open separate issue, if present in latest v1.0.0 alphas.

Otherwise, wait for for v1.0.0 (probably at least a month out); or (if using v0.1.4, which is the current stable ATM) try/except for the JSONDecodeError (ugly and improper, I know - sorry).