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Merge pull request #6832 from minrk/request-only-once

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actually send only one kernel_info request
This commit is contained in:
Thomas Kluyver 2014-11-03 10:37:17 -08:00
commit 963921c4ff
1 changed files with 10 additions and 9 deletions
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19
IPython/html/services/kernels/handlers.py
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@ -103,8 +103,8 @@ class ZMQChannelHandler(AuthenticatedZMQStreamHandler):
km = self.kernel_manager
kernel = km.get_kernel(self.kernel_id)
try:
# check for cached value
kernel_info = kernel._kernel_info
# check for previous request
future = kernel._kernel_info_future
except AttributeError:
self.log.debug("Requesting kernel info from %s", self.kernel_id)
# Create a kernel_info channel to query the kernel protocol version.
@ -113,9 +113,12 @@ class ZMQChannelHandler(AuthenticatedZMQStreamHandler):
self.kernel_info_channel = km.connect_shell(self.kernel_id)
self.kernel_info_channel.on_recv(self._handle_kernel_info_reply)
self.session.send(self.kernel_info_channel, "kernel_info_request")
# store the future on the kernel, so only one request is sent
kernel._kernel_info_future = self._kernel_info_future
else:
# use cached value, don't resend request
self._finish_kernel_info(kernel_info)
if not future.done():
self.log.debug("Waiting for pending kernel_info request")
future.add_done_callback(lambda f: self._finish_kernel_info(f.result()))
return self._kernel_info_future
def _handle_kernel_info_reply(self, msg):
@ -128,16 +131,14 @@ class ZMQChannelHandler(AuthenticatedZMQStreamHandler):
msg = self.session.deserialize(msg)
except:
self.log.error("Bad kernel_info reply", exc_info=True)
self._kernel_info_future.set_result(None)
self._kernel_info_future.set_result({})
return
else:
info = msg['content']
self.log.debug("Received kernel info: %s", info)
if msg['msg_type'] != 'kernel_info_reply' or 'protocol_version' not in info:
self.log.error("Kernel info request failed, assuming current %s", info)
else:
kernel = self.kernel_manager.get_kernel(self.kernel_id)
kernel._kernel_info = info
info = {}
self._finish_kernel_info(info)
# close the kernel_info channel, we don't need it anymore
@ -179,7 +180,7 @@ class ZMQChannelHandler(AuthenticatedZMQStreamHandler):
if future.done():
return
self.log.warn("Timeout waiting for kernel_info reply from %s", self.kernel_id)
future.set_result(None)
future.set_result({})
loop = IOLoop.current()
loop.add_timeout(loop.time() + self.kernel_info_timeout, give_up)
# actually wait for it