93 lines
2.9 KiB
Python
93 lines
2.9 KiB
Python
import os
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import sys
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import py
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try: from cStringIO import StringIO
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except ImportError: from StringIO import StringIO
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class Capture(object):
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def call(cls, func, *args, **kwargs):
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""" 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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call the given function with args/kwargs
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and capture output/error during its execution.
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"""
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so = cls()
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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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call = classmethod(call)
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class StdCaptureFD(Capture):
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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 = py.io.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 = py.io.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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""" reset sys.stdout and sys.stderr
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returns a tuple of file objects (out, err) for the captured
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data
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"""
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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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class StdCapture(Capture):
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""" capture sys.stdout/sys.stderr (but not system level fd 1 and 2).
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This class allows to capture writes to sys.stdout|stderr "in-memory"
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and will raise errors on tries to read from sys.stdin.
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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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