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78 lines
2.4 KiB
78 lines
2.4 KiB
"""Test kernel for signalling subprocesses"""
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# Copyright (c) Jupyter Development Team.
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# Distributed under the terms of the Modified BSD License.
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import os
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from subprocess import Popen, PIPE
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import sys
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import time
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from ipykernel.displayhook import ZMQDisplayHook
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from ipykernel.kernelbase import Kernel
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from ipykernel.kernelapp import IPKernelApp
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class SignalTestKernel(Kernel):
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"""Kernel for testing subprocess signaling"""
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implementation = 'signaltest'
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implementation_version = '0.0'
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banner = ''
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def __init__(self, **kwargs):
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kwargs.pop('user_ns', None)
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super().__init__(**kwargs)
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self.children = []
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def do_execute(self, code, silent, store_history=True, user_expressions=None,
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allow_stdin=False):
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code = code.strip()
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reply = {
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'status': 'ok',
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'user_expressions': {},
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}
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if code == 'start':
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child = Popen(['bash', '-i', '-c', 'sleep 30'], stderr=PIPE)
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self.children.append(child)
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reply['user_expressions']['pid'] = self.children[-1].pid
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elif code == 'check':
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reply['user_expressions']['poll'] = [ child.poll() for child in self.children ]
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elif code == 'env':
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reply['user_expressions']['env'] = os.getenv("TEST_VARS", "")
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elif code == 'sleep':
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try:
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time.sleep(10)
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except KeyboardInterrupt:
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reply['user_expressions']['interrupted'] = True
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else:
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reply['user_expressions']['interrupted'] = False
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else:
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reply['status'] = 'error'
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reply['ename'] = 'Error'
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reply['evalue'] = code
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reply['traceback'] = ['no such command: %s' % code]
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return reply
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def kernel_info_request(self, *args, **kwargs):
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"""Add delay to kernel_info_request
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triggers slow-response code in KernelClient.wait_for_ready
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"""
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return super().kernel_info_request(*args, **kwargs)
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class SignalTestApp(IPKernelApp):
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kernel_class = SignalTestKernel
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def init_io(self):
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# Overridden to disable stdout/stderr capture
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self.displayhook = ZMQDisplayHook(self.session, self.iopub_socket)
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if __name__ == '__main__':
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# make startup artificially slow,
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# so that we exercise client logic for slow-starting kernels
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time.sleep(2)
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SignalTestApp.launch_instance()
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