mirror of
https://github.com/thegeeklab/ansible-later.git
synced 2024-11-26 23:00:36 +00:00
372 lines
11 KiB
Python
372 lines
11 KiB
Python
import os
|
|
import sys
|
|
import py
|
|
import tempfile
|
|
|
|
try:
|
|
from io import StringIO
|
|
except ImportError:
|
|
from StringIO import StringIO
|
|
|
|
if sys.version_info < (3,0):
|
|
class TextIO(StringIO):
|
|
def write(self, data):
|
|
if not isinstance(data, unicode):
|
|
data = unicode(data, getattr(self, '_encoding', 'UTF-8'), 'replace')
|
|
StringIO.write(self, data)
|
|
else:
|
|
TextIO = StringIO
|
|
|
|
try:
|
|
from io import BytesIO
|
|
except ImportError:
|
|
class BytesIO(StringIO):
|
|
def write(self, data):
|
|
if isinstance(data, unicode):
|
|
raise TypeError("not a byte value: %r" %(data,))
|
|
StringIO.write(self, data)
|
|
|
|
patchsysdict = {0: 'stdin', 1: 'stdout', 2: 'stderr'}
|
|
|
|
class FDCapture:
|
|
""" Capture IO to/from a given os-level filedescriptor. """
|
|
|
|
def __init__(self, targetfd, tmpfile=None, now=True, patchsys=False):
|
|
""" save targetfd descriptor, and open a new
|
|
temporary file there. If no tmpfile is
|
|
specified a tempfile.Tempfile() will be opened
|
|
in text mode.
|
|
"""
|
|
self.targetfd = targetfd
|
|
if tmpfile is None and targetfd != 0:
|
|
f = tempfile.TemporaryFile('wb+')
|
|
tmpfile = dupfile(f, encoding="UTF-8")
|
|
f.close()
|
|
self.tmpfile = tmpfile
|
|
self._savefd = os.dup(self.targetfd)
|
|
if patchsys:
|
|
self._oldsys = getattr(sys, patchsysdict[targetfd])
|
|
if now:
|
|
self.start()
|
|
|
|
def start(self):
|
|
try:
|
|
os.fstat(self._savefd)
|
|
except OSError:
|
|
raise ValueError("saved filedescriptor not valid, "
|
|
"did you call start() twice?")
|
|
if self.targetfd == 0 and not self.tmpfile:
|
|
fd = os.open(devnullpath, os.O_RDONLY)
|
|
os.dup2(fd, 0)
|
|
os.close(fd)
|
|
if hasattr(self, '_oldsys'):
|
|
setattr(sys, patchsysdict[self.targetfd], DontReadFromInput())
|
|
else:
|
|
os.dup2(self.tmpfile.fileno(), self.targetfd)
|
|
if hasattr(self, '_oldsys'):
|
|
setattr(sys, patchsysdict[self.targetfd], self.tmpfile)
|
|
|
|
def done(self):
|
|
""" unpatch and clean up, returns the self.tmpfile (file object)
|
|
"""
|
|
os.dup2(self._savefd, self.targetfd)
|
|
os.close(self._savefd)
|
|
if self.targetfd != 0:
|
|
self.tmpfile.seek(0)
|
|
if hasattr(self, '_oldsys'):
|
|
setattr(sys, patchsysdict[self.targetfd], self._oldsys)
|
|
return self.tmpfile
|
|
|
|
def writeorg(self, data):
|
|
""" write a string to the original file descriptor
|
|
"""
|
|
tempfp = tempfile.TemporaryFile()
|
|
try:
|
|
os.dup2(self._savefd, tempfp.fileno())
|
|
tempfp.write(data)
|
|
finally:
|
|
tempfp.close()
|
|
|
|
|
|
def dupfile(f, mode=None, buffering=0, raising=False, encoding=None):
|
|
""" return a new open file object that's a duplicate of f
|
|
|
|
mode is duplicated if not given, 'buffering' controls
|
|
buffer size (defaulting to no buffering) and 'raising'
|
|
defines whether an exception is raised when an incompatible
|
|
file object is passed in (if raising is False, the file
|
|
object itself will be returned)
|
|
"""
|
|
try:
|
|
fd = f.fileno()
|
|
mode = mode or f.mode
|
|
except AttributeError:
|
|
if raising:
|
|
raise
|
|
return f
|
|
newfd = os.dup(fd)
|
|
if sys.version_info >= (3,0):
|
|
if encoding is not None:
|
|
mode = mode.replace("b", "")
|
|
buffering = True
|
|
return os.fdopen(newfd, mode, buffering, encoding, closefd=True)
|
|
else:
|
|
f = os.fdopen(newfd, mode, buffering)
|
|
if encoding is not None:
|
|
return EncodedFile(f, encoding)
|
|
return f
|
|
|
|
class EncodedFile(object):
|
|
def __init__(self, _stream, encoding):
|
|
self._stream = _stream
|
|
self.encoding = encoding
|
|
|
|
def write(self, obj):
|
|
if isinstance(obj, unicode):
|
|
obj = obj.encode(self.encoding)
|
|
elif isinstance(obj, str):
|
|
pass
|
|
else:
|
|
obj = str(obj)
|
|
self._stream.write(obj)
|
|
|
|
def writelines(self, linelist):
|
|
data = ''.join(linelist)
|
|
self.write(data)
|
|
|
|
def __getattr__(self, name):
|
|
return getattr(self._stream, name)
|
|
|
|
class Capture(object):
|
|
def call(cls, func, *args, **kwargs):
|
|
""" return a (res, out, err) tuple where
|
|
out and err represent the output/error output
|
|
during function execution.
|
|
call the given function with args/kwargs
|
|
and capture output/error during its execution.
|
|
"""
|
|
so = cls()
|
|
try:
|
|
res = func(*args, **kwargs)
|
|
finally:
|
|
out, err = so.reset()
|
|
return res, out, err
|
|
call = classmethod(call)
|
|
|
|
def reset(self):
|
|
""" reset sys.stdout/stderr and return captured output as strings. """
|
|
if hasattr(self, '_reset'):
|
|
raise ValueError("was already reset")
|
|
self._reset = True
|
|
outfile, errfile = self.done(save=False)
|
|
out, err = "", ""
|
|
if outfile and not outfile.closed:
|
|
out = outfile.read()
|
|
outfile.close()
|
|
if errfile and errfile != outfile and not errfile.closed:
|
|
err = errfile.read()
|
|
errfile.close()
|
|
return out, err
|
|
|
|
def suspend(self):
|
|
""" return current snapshot captures, memorize tempfiles. """
|
|
outerr = self.readouterr()
|
|
outfile, errfile = self.done()
|
|
return outerr
|
|
|
|
|
|
class StdCaptureFD(Capture):
|
|
""" This class allows to capture writes to FD1 and FD2
|
|
and may connect a NULL file to FD0 (and prevent
|
|
reads from sys.stdin). If any of the 0,1,2 file descriptors
|
|
is invalid it will not be captured.
|
|
"""
|
|
def __init__(self, out=True, err=True, mixed=False,
|
|
in_=True, patchsys=True, now=True):
|
|
self._options = {
|
|
"out": out,
|
|
"err": err,
|
|
"mixed": mixed,
|
|
"in_": in_,
|
|
"patchsys": patchsys,
|
|
"now": now,
|
|
}
|
|
self._save()
|
|
if now:
|
|
self.startall()
|
|
|
|
def _save(self):
|
|
in_ = self._options['in_']
|
|
out = self._options['out']
|
|
err = self._options['err']
|
|
mixed = self._options['mixed']
|
|
patchsys = self._options['patchsys']
|
|
if in_:
|
|
try:
|
|
self.in_ = FDCapture(0, tmpfile=None, now=False,
|
|
patchsys=patchsys)
|
|
except OSError:
|
|
pass
|
|
if out:
|
|
tmpfile = None
|
|
if hasattr(out, 'write'):
|
|
tmpfile = out
|
|
try:
|
|
self.out = FDCapture(1, tmpfile=tmpfile,
|
|
now=False, patchsys=patchsys)
|
|
self._options['out'] = self.out.tmpfile
|
|
except OSError:
|
|
pass
|
|
if err:
|
|
if out and mixed:
|
|
tmpfile = self.out.tmpfile
|
|
elif hasattr(err, 'write'):
|
|
tmpfile = err
|
|
else:
|
|
tmpfile = None
|
|
try:
|
|
self.err = FDCapture(2, tmpfile=tmpfile,
|
|
now=False, patchsys=patchsys)
|
|
self._options['err'] = self.err.tmpfile
|
|
except OSError:
|
|
pass
|
|
|
|
def startall(self):
|
|
if hasattr(self, 'in_'):
|
|
self.in_.start()
|
|
if hasattr(self, 'out'):
|
|
self.out.start()
|
|
if hasattr(self, 'err'):
|
|
self.err.start()
|
|
|
|
def resume(self):
|
|
""" resume capturing with original temp files. """
|
|
self.startall()
|
|
|
|
def done(self, save=True):
|
|
""" return (outfile, errfile) and stop capturing. """
|
|
outfile = errfile = None
|
|
if hasattr(self, 'out') and not self.out.tmpfile.closed:
|
|
outfile = self.out.done()
|
|
if hasattr(self, 'err') and not self.err.tmpfile.closed:
|
|
errfile = self.err.done()
|
|
if hasattr(self, 'in_'):
|
|
tmpfile = self.in_.done()
|
|
if save:
|
|
self._save()
|
|
return outfile, errfile
|
|
|
|
def readouterr(self):
|
|
""" return snapshot value of stdout/stderr capturings. """
|
|
if hasattr(self, "out"):
|
|
out = self._readsnapshot(self.out.tmpfile)
|
|
else:
|
|
out = ""
|
|
if hasattr(self, "err"):
|
|
err = self._readsnapshot(self.err.tmpfile)
|
|
else:
|
|
err = ""
|
|
return [out, err]
|
|
|
|
def _readsnapshot(self, f):
|
|
f.seek(0)
|
|
res = f.read()
|
|
enc = getattr(f, "encoding", None)
|
|
if enc:
|
|
res = py.builtin._totext(res, enc, "replace")
|
|
f.truncate(0)
|
|
f.seek(0)
|
|
return res
|
|
|
|
|
|
class StdCapture(Capture):
|
|
""" This class allows to capture writes to sys.stdout|stderr "in-memory"
|
|
and will raise errors on tries to read from sys.stdin. It only
|
|
modifies sys.stdout|stderr|stdin attributes and does not
|
|
touch underlying File Descriptors (use StdCaptureFD for that).
|
|
"""
|
|
def __init__(self, out=True, err=True, in_=True, mixed=False, now=True):
|
|
self._oldout = sys.stdout
|
|
self._olderr = sys.stderr
|
|
self._oldin = sys.stdin
|
|
if out and not hasattr(out, 'file'):
|
|
out = TextIO()
|
|
self.out = out
|
|
if err:
|
|
if mixed:
|
|
err = out
|
|
elif not hasattr(err, 'write'):
|
|
err = TextIO()
|
|
self.err = err
|
|
self.in_ = in_
|
|
if now:
|
|
self.startall()
|
|
|
|
def startall(self):
|
|
if self.out:
|
|
sys.stdout = self.out
|
|
if self.err:
|
|
sys.stderr = self.err
|
|
if self.in_:
|
|
sys.stdin = self.in_ = DontReadFromInput()
|
|
|
|
def done(self, save=True):
|
|
""" return (outfile, errfile) and stop capturing. """
|
|
outfile = errfile = None
|
|
if self.out and not self.out.closed:
|
|
sys.stdout = self._oldout
|
|
outfile = self.out
|
|
outfile.seek(0)
|
|
if self.err and not self.err.closed:
|
|
sys.stderr = self._olderr
|
|
errfile = self.err
|
|
errfile.seek(0)
|
|
if self.in_:
|
|
sys.stdin = self._oldin
|
|
return outfile, errfile
|
|
|
|
def resume(self):
|
|
""" resume capturing with original temp files. """
|
|
self.startall()
|
|
|
|
def readouterr(self):
|
|
""" return snapshot value of stdout/stderr capturings. """
|
|
out = err = ""
|
|
if self.out:
|
|
out = self.out.getvalue()
|
|
self.out.truncate(0)
|
|
self.out.seek(0)
|
|
if self.err:
|
|
err = self.err.getvalue()
|
|
self.err.truncate(0)
|
|
self.err.seek(0)
|
|
return out, err
|
|
|
|
class DontReadFromInput:
|
|
"""Temporary stub class. Ideally when stdin is accessed, the
|
|
capturing should be turned off, with possibly all data captured
|
|
so far sent to the screen. This should be configurable, though,
|
|
because in automated test runs it is better to crash than
|
|
hang indefinitely.
|
|
"""
|
|
def read(self, *args):
|
|
raise IOError("reading from stdin while output is captured")
|
|
readline = read
|
|
readlines = read
|
|
__iter__ = read
|
|
|
|
def fileno(self):
|
|
raise ValueError("redirected Stdin is pseudofile, has no fileno()")
|
|
def isatty(self):
|
|
return False
|
|
def close(self):
|
|
pass
|
|
|
|
try:
|
|
devnullpath = os.devnull
|
|
except AttributeError:
|
|
if os.name == 'nt':
|
|
devnullpath = 'NUL'
|
|
else:
|
|
devnullpath = '/dev/null'
|