59 lines
1.7 KiB
Python
59 lines
1.7 KiB
Python
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"""
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capture stdout/stderr
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"""
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import sys
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try: from cStringIO import StringIO
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except ImportError: from StringIO import StringIO
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class SimpleOutErrCapture:
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""" capture sys.stdout/sys.stderr (but not system level fd 1 and 2).
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this captures only "In-Memory" and is currently intended to be
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used by the unittest package to capture print-statements in tests.
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"""
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def __init__(self):
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self.oldin = sys.stdin
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self.oldout = sys.stdout
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self.olderr = sys.stderr
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sys.stdin = self.newin = DontReadFromInput()
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sys.stdout = self.newout = StringIO()
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sys.stderr = self.newerr = StringIO()
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def reset(self):
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""" return captured output and restore sys.stdout/err."""
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x, y = self.done()
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return x.read(), y.read()
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def done(self):
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o,e = sys.stdout, sys.stderr
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sys.stdin, sys.stdout, sys.stderr = (
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self.oldin, self.oldout, self.olderr)
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del self.oldin, self.oldout, self.olderr
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o, e = self.newout, self.newerr
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o.seek(0)
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e.seek(0)
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return o,e
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class DontReadFromInput:
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"""Temporary stub class. Ideally when stdin is accessed, the
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capturing should be turned off, with possibly all data captured
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so far sent to the screen. This should be configurable, though,
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because in automated test runs it is better to crash than
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hang indefinitely.
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"""
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def read(self, *args):
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raise IOError("reading from stdin while output is captured")
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readline = read
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readlines = read
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__iter__ = read
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def callcapture(func, *args, **kwargs):
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so = SimpleOutErrCapture()
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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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