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Continue to retry after network exception #2

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Continue to retry after network exception #2

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e03650f
Continue to retry after network exception
dustinosity Mar 5, 2013
cbc18a0
Moved network retry handling into get_prediction
dustinosity Mar 5, 2013
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32 changes: 24 additions & 8 deletions muniled.py
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Original file line number Diff line number Diff line change
Expand Up @@ -33,17 +33,16 @@ def main(args):
elif args.display == 'console':
led_strip = ConsoleStrip(160)
led_strip.all_off()

try:
while True:
update(led_strip)
update(led_strip)
time.sleep(5.0)
except:
led_strip.all_off()
raise


def get_predictions(route, stop_id):
def get_predictions(route, stop_id, led_strip):
base_url = 'http://webservices.nextbus.com/service/publicXMLFeed'
params = {
'command': 'predictions',
Expand All @@ -52,9 +51,20 @@ def get_predictions(route, stop_id):
's': stop_id,
'useShortTitles': 'true'
}
response = urllib2.urlopen('{url}?{params}'.format(
url=base_url,
params=urllib.urlencode(params)))

# attempt to fetch and retry on error after a pause
while True:
try:
response = urllib2.urlopen('{url}?{params}'.format(
url=base_url,
params=urllib.urlencode(params)))
break
except urllib2.URLError, e:
print e.reason
dim(led_strip)
time.sleep(5.0)
pass

dom = minidom.parse(response)
predictions = dom.getElementsByTagName('prediction')
return [int(p.attributes['minutes'].value) for p in predictions]
Expand All @@ -64,11 +74,11 @@ def update(led_strip=None):
line = [False for i in range(led_strip.leds)]

# inbound
for prediction in get_predictions('N', 3915):
for prediction in get_predictions('N', 3915, led_strip):
line[80 - prediction - 1] = True

# outbound
for prediction in get_predictions('N', 3914):
for prediction in get_predictions('N', 3914, led_strip):
line[80 + prediction] = True

# set train leds
Expand All @@ -85,6 +95,12 @@ def update(led_strip=None):
# Update the strip
led_strip.update()

def dim(led_strip):
# dim all the leds a little
# TODO
pass


if __name__ == "__main__":
parser = argparse.ArgumentParser(description='Muni trains on a LED strip.')
parser.add_argument('-d', '--display', choices=['led', 'console'],
Expand Down