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"""Use the profile plugin with --with-profile or NOSE_WITH_PROFILE to
enable profiling using the hotshot profiler. Profiler output can be
controlled with the --profile-sort and --profile-restrict, and the
profiler output file may be changed with --profile-stats-file.
See the hotshot documentation in the standard library documentation for
more details on the various output options.
"""
try:
import hotshot
from hotshot import stats
except ImportError:
hotshot, stats = None, None
import logging
import os
import sys
import tempfile
from nose.plugins.base import Plugin
from nose.util import tolist
log = logging.getLogger('nose.plugins')
class Profile(Plugin):
"""
Use this plugin to run tests using the hotshot profiler.
"""
pfile = None
clean_stats_file = False
def options(self, parser, env=os.environ):
if not self.available():
return
Plugin.options(self, parser, env)
parser.add_option('--profile-sort', action='store', dest='profile_sort',
default=env.get('NOSE_PROFILE_SORT', 'cumulative'),
help="Set sort order for profiler output")
parser.add_option('--profile-stats-file', action='store',
dest='profile_stats_file',
default=env.get('NOSE_PROFILE_STATS_FILE'),
help='Profiler stats file; default is a new '
'temp file on each run')
parser.add_option('--profile-restrict', action='append',
dest='profile_restrict',
default=env.get('NOSE_PROFILE_RESTRICT'),
help="Restrict profiler output. See help for "
"pstats.Stats for details")
def available(cls):
return hotshot is not None
available = classmethod(available)
def begin(self):
if not self.available():
return
self._create_pfile()
self.prof = hotshot.Profile(self.pfile)
def configure(self, options, conf):
if not self.available():
self.enabled = False
return
Plugin.configure(self, options, conf)
self.conf = conf
if options.profile_stats_file:
self.pfile = options.profile_stats_file
self.clean_stats_file = False
else:
self.pfile = None
self.clean_stats_file = True
self.fileno = None
self.sort = options.profile_sort
self.restrict = tolist(options.profile_restrict)
def prepareTest(self, test):
if not self.available():
return
log.debug('preparing test %s' % test)
def run_and_profile(result, prof=self.prof, test=test):
self._create_pfile()
prof.runcall(test, result)
return run_and_profile
def report(self, stream):
log.debug('printing profiler report')
self.prof.close()
prof_stats = stats.load(self.pfile)
prof_stats.sort_stats(self.sort)
# 2.5 has completely different stream handling from 2.4 and earlier.
# Before 2.5, stats objects have no stream attribute; in 2.5 and later
# a reference sys.stdout is stored before we can tweak it.
compat_25 = hasattr(stats, 'stream')
if compat_25:
tmp = prof_stats.stream
stats.stream = stream
else:
tmp = sys.stdout
sys.stdout = stream
try:
if self.restrict:
log.debug('setting profiler restriction to %s', self.restrict)
prof_stats.print_stats(*self.restrict)
else:
prof_stats.print_stats()
finally:
if compat_25:
stats.stream = tmp
else:
sys.stdout = tmp
def finalize(self, result):
if not self.available():
return
try:
self.prof.close()
except AttributeError:
# TODO: is this trying to catch just the case where not
# hasattr(self.prof, "close")? If so, the function call should be
# moved out of the try: suite.
pass
if self.clean_stats_file:
if self.fileno:
try:
os.close(self.fileno)
except OSError:
pass
try:
os.unlink(self.pfile)
except OSError:
pass
return None
def _create_pfile(self):
if not self.pfile:
self.fileno, self.pfile = tempfile.mkstemp()
self.clean_stats_file = True