JSON has immense hatred of NaN values

kiln/manager.py

@@ -152,6 +152,9 @@ class Profile(threading.Thread):
 					self.pid.setPoint(setpoint)
 
 					temp = self.therm.temperature.temp
+					if temp == -1:
+						continue #skip invalid temperature readings
+
 					pid_out = self.pid.update(temp)
 					if pid_out < 0: pid_out = 0
 					if pid_out > 1: pid_out = 1

kiln/server.py

@@ -5,7 +5,6 @@ import os
 import re
 import time
 import json
-import math
 import traceback
 import inspect
 
@@ -39,7 +38,7 @@ class MainHandler(ManagerHandler):
 
         return self.render(os.path.join(paths.html_templates, "main.html"), 
             state=self.manager.state.__class__.__name__,
-            state_data=json.dumps(self.manager.state.status, allow_nan=False),
+            state_data=json.dumps(self.manager.state.status),
             profiles=profiles,
         )
 
@@ -120,7 +119,7 @@ class WebApp(object):
         self.port = port
 
     def send(self, data):
-        jsondat = json.dumps(data, allow_nan=False)
+        jsondat = json.dumps(data)
         for sock in self.clients:
             sock.write_message(jsondat)
 

kiln/thermo.py

@@ -5,6 +5,7 @@ import datetime
 import logging
 import threading
 from collections import deque, namedtuple
+from math import isnan
 
 logger = logging.getLogger("thermo")
 
@@ -82,11 +83,12 @@ class Breakout(object):
 
     def get(self):
         time.sleep(.25)
-        return tempsample(time.time(), self.device.temperature)
+        temp = self.device.temperature if not isnan(self.device.temperature) else -1
+        return tempsample(time.time(), temp)
 
     @property
     def temperature(self):
-        return self.device.temperature
+        return self.device.temperature if not isnan(self.device.temperature) else -1
 
 class Monitor(threading.Thread):
     def __init__(self, cls=MAX31850, **kwargs):