mirror of
ssh://git.janware.com/srv/git/janware/proj/jw-python
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108 lines
3.5 KiB
Python
108 lines
3.5 KiB
Python
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import asyncio
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from jwutils.log import *
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# FIXME: Derive this from Process, or merge the classes entirely
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class ShellCmd: # export
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class SubprocessProtocol(asyncio.SubprocessProtocol):
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def __init__(self, process, name):
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self.process = process
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self.name = name
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super().__init__()
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def pipe_data_received(self, fd, data):
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stream = "stdout" if fd == 1 else ("stderr" if fd == 2 else str(fd))
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tag = stream + '@' + self.name
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data = data.decode().rstrip('\n')
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prio = WARNING if fd == 2 else INFO
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for line in data.split('\n'):
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slog(prio, "[%s] %s" % (tag, line.rstrip('\r\n')))
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def process_exited(self):
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slog(DEBUG, "[%s] process exited" % (self.name))
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super().process_exited()
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self.process.exited()
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class ShutdownState:
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Running = 1
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Triggered = 2
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Completed = 3
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Unnecessary = 4
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def __init__(self, cmdline, eloop=None, name=None):
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if eloop is None:
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eloop = asyncio.get_running_loop()
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self.__eloop = eloop
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self.__cmdline = cmdline
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self.__name = name if name is not None else cmdline[0]
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self.__transport = None
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self.__protocol = None
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self.__proc = None
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self.__rc = None
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self.__task = None
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self.__shutdown = self.ShutdownState.Unnecessary
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async def __exec(self):
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def format_cmdline(arr):
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r = ''
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for tok in arr:
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if re.search(' ', tok):
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r += ' "%s"' % tok
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continue
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r += ' ' + tok
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return r[1:]
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try:
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slog(INFO, "Running shell command [{}]: {}".format(self.__name, format_cmdline(self.__cmdline)))
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self.__transport, self.__protocol = await self.__eloop.subprocess_exec(
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lambda: self.SubprocessProtocol(self, self.__name),
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*self.__cmdline,
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)
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self.__proc = self.__transport.get_extra_info('subprocess') # Popen instance
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except:
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slog(ERR, "Failed to run process [{}]".format(self.__name))
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raise
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def __reap(self):
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if self.__rc is None and self.__transport:
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self.__transport = None
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self.__rc = self.__proc.wait()
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# to be called from SubprocessProtocol / SIGCHLD handler
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def exited(self):
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slog(DEBUG, "Process {} exited".format(self.__name))
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self.__reap()
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async def __cleanup(self):
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pid = self.__reap()
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sd_fine = self.__shutdown in [ self.ShutdownState.Unnecessary, self.ShutdownState.Completed ]
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if self.__rc == 0 and sd_fine:
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slog(INFO, "The shell command [{}], pid {}, has exited cleanly".format(self.__name, self.__proc.pid))
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self.monitor = self.console = self.__protocol = self.__task = None
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return 0
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slog(ERR, "The process ([{}], pid {}) has exited {}with status code {}, aborting".format(
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self.__name, pid, "" if sd_fine else "prematurely ", self.__rc))
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exit(1)
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async def init(self):
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self.__task = await self.__eloop.create_task(self.__exec())
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async def cleanup(self):
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await self.__cleanup()
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async def run(self):
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await self.init()
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await self.cleanup()
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if __name__ == '__main__':
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import jwutils.log
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jwutils.log.set_level(INFO)
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async def run():
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sp = ShellCmd([ 'echo', 'hello world!' ])
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await sp.run()
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asyncio.run(run())
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