a863f55ba8
Sometimes it can be necessary to debug complex problems in a running instance. A repl server can be useful in this case. However this can be highly dangerous in case the port is not correctly firewalled of. Thus add an undocumented command to enable and disable it. To enable: zuul-scheduler repl To disable zuul-scheduler norepl Change-Id: I860db5d088c6b07a66b4390cdfd66637341e7a7a Co-Authored-By: Tobias Henkel <tobias.henkel@bmw.de>
82 lines
2.5 KiB
Python
82 lines
2.5 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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# Based on ASL2 code from:
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# https://gist.github.com/tim-patterson/4471877
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import sys
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import io
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import threading
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import socketserver
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import code
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class ThreadLocalProxy(object):
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def __init__(self, default):
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self.files = {}
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self.default = default
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def __getattr__(self, name):
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obj = self.files.get(threading.currentThread(), self.default)
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return getattr(obj, name)
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def register(self, obj):
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self.files[threading.currentThread()] = obj
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def unregister(self):
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self.files.pop(threading.currentThread())
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class REPLHandler(socketserver.StreamRequestHandler):
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def handle(self):
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sys.stdout.register(io.TextIOWrapper(self.wfile, 'utf8'))
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sys.stderr.register(io.TextIOWrapper(self.wfile, 'utf8'))
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sys.stdin.register(io.TextIOWrapper(self.rfile, 'utf8'))
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try:
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console = code.InteractiveConsole(locals())
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console.interact('Console:')
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except Exception:
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pass
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finally:
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sys.stdout.unregister()
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sys.stderr.unregister()
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sys.stdin.unregister()
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class REPLThreadedTCPServer(socketserver.ThreadingMixIn,
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socketserver.TCPServer):
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daemon_threads = True
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allow_reuse_address = True
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def __init__(self, scheduler, *args, **kw):
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self.scheduler = scheduler
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super(REPLThreadedTCPServer, self).__init__(*args, **kw)
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sys.stdout = ThreadLocalProxy(sys.stdout)
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sys.stderr = ThreadLocalProxy(sys.stderr)
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sys.stdin = ThreadLocalProxy(sys.stdin)
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class REPLServer(object):
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def __init__(self, scheduler):
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self.server = REPLThreadedTCPServer(
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scheduler, ('localhost', 3000), REPLHandler)
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def start(self):
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self.thread = threading.Thread(target=self.server.serve_forever)
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self.thread.daemon = True
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self.thread.start()
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def stop(self):
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self.server.shutdown()
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self.server.server_close()
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self.thread.join(10)
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