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Add a heartbeat method to the py.Stream class (more below) #137

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Merged
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Nov 19, 2014
Merged

Add a heartbeat method to the py.Stream class (more below) #137

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15 changes: 15 additions & 0 deletions plotly/plotly/plotly.py
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Original file line number Diff line number Diff line change
Expand Up @@ -416,6 +416,21 @@ def __init__(self, stream_id):
self.stream_id = stream_id
self.connected = False

def heartbeat(self, reconnect_on=(200, '', 408)):
"""Keep stream alive. Streams will close after ~1 min of inactivity.

If the interval between stream writes is > 30 seconds, you should
consider adding a heartbeat between your stream.write() calls like so:
>>> stream.heartbeat()

"""
try:
self._stream.write('\n', reconnect_on=reconnect_on)
except AttributeError:
raise exceptions.PlotlyError("Stream has not been opened yet, "
"cannot write to a closed connection. "
"Call `open()` on the stream to open the stream.")

def open(self):
"""Open streaming connection to plotly.

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