76 lines
2.1 KiB
Python
76 lines
2.1 KiB
Python
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import os, sys
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import py
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class FDCapture:
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""" Capture IO to/from a given os-level filedescriptor. """
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def __init__(self, targetfd, tmpfile=None):
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self.targetfd = targetfd
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if tmpfile is None:
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tmpfile = self.maketmpfile()
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self.tmpfile = tmpfile
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self._savefd = os.dup(targetfd)
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os.dup2(self.tmpfile.fileno(), targetfd)
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self._patched = []
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def setasfile(self, name, module=sys):
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key = (module, name)
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self._patched.append((key, getattr(module, name)))
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setattr(module, name, self.tmpfile)
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def unsetfiles(self):
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while self._patched:
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(module, name), value = self._patched.pop()
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setattr(module, name, value)
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def done(self):
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os.dup2(self._savefd, self.targetfd)
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self.unsetfiles()
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os.close(self._savefd)
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self.tmpfile.seek(0)
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return self.tmpfile
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def maketmpfile(self):
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f = os.tmpfile()
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newf = py.io.dupfile(f)
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f.close()
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return newf
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class OutErrCapture:
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""" capture Stdout and Stderr both on filedescriptor
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and sys.stdout/stderr level.
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"""
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def __init__(self, out=True, err=True, patchsys=True):
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if out:
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self.out = FDCapture(1)
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if patchsys:
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self.out.setasfile('stdout')
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if err:
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self.err = FDCapture(2)
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if patchsys:
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self.err.setasfile('stderr')
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def reset(self):
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out = err = ""
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if hasattr(self, 'out'):
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outfile = self.out.done()
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out = outfile.read()
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if hasattr(self, 'err'):
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errfile = self.err.done()
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err = errfile.read()
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return out, err
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def callcapture(func, *args, **kwargs):
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""" call the given function with args/kwargs
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and return a (res, out, err) tuple where
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out and err represent the output/error output
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during function execution.
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"""
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so = OutErrCapture()
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try:
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res = func(*args, **kwargs)
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finally:
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out, err = so.reset()
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return res, out, err
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