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38 lines
1.3 KiB
38 lines
1.3 KiB
"""
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Util for talking to the client program in order to retrieve
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dynamic defaults for the UI
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"""
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import subprocess
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from json import JSONDecodeError
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from subprocess import CalledProcessError
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from gooey.python_bindings.types import Try, Success, Failure
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from gooey.python_bindings.coms import deserialize_inbound
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def communicate(cmd, encoding) -> Try:
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"""
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Invoke the processes specified by `cmd`.
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Assumes that the process speaks JSON over stdout. Non-json response
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are treated as an error.
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Implementation Note: I don't know why, but `Popen` is like ~5-6x faster
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than `check_output`. in practice, it means waiting for ~1/10th
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of a second rather than ~7/10ths of a second. A
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difference which is pretty weighty when there's a
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user waiting on the other end.
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"""
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try:
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proc = subprocess.Popen(
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cmd,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE
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)
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out, err = proc.communicate()
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if out and proc.poll() == 0:
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return Success(deserialize_inbound(out, encoding))
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else:
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return Failure(CalledProcessError(proc.returncode, cmd, output=out, stderr=err))
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except JSONDecodeError as e:
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return Failure(e)
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