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"""High-perfomance logging profiler, mostly written in C."""
import _hotshot
from _hotshot import ProfilerError
class Profile:
def __init__(self, logfn, lineevents=0, linetimings=1):
self.lineevents = lineevents and 1 or 0
self.linetimings = (linetimings and lineevents) and 1 or 0
self._prof = p = _hotshot.profiler(
logfn, self.lineevents, self.linetimings)
# Attempt to avoid confusing results caused by the presence of
# Python wrappers around these functions, but only if we can
# be sure the methods have not been overridden or extended.
if self.__class__ is Profile:
self.close = p.close
self.start = p.start
self.stop = p.stop
self.addinfo = p.addinfo
def close(self):
"""Close the logfile and terminate the profiler."""
self._prof.close()
def fileno(self):
"""Return the file descriptor of the profiler's log file."""
return self._prof.fileno()
def start(self):
"""Start the profiler."""
self._prof.start()
def stop(self):
"""Stop the profiler."""
self._prof.stop()
def addinfo(self, key, value):
"""Add an arbitrary labelled value to the profile log."""
self._prof.addinfo(key, value)
# These methods offer the same interface as the profile.Profile class,
# but delegate most of the work to the C implementation underneath.
def run(self, cmd):
"""Profile an exec-compatible string in the script
environment.
The globals from the __main__ module are used as both the
globals and locals for the script.
"""
import __main__
dict = __main__.__dict__
return self.runctx(cmd, dict, dict)
def runctx(self, cmd, globals, locals):
"""Evaluate an exec-compatible string in a specific
environment.
The string is compiled before profiling begins.
"""
code = compile(cmd, "<string>", "exec")
self._prof.runcode(code, globals, locals)
return self
def runcall(self, func, *args, **kw):
"""Profile a single call of a callable.
Additional positional and keyword arguments may be passed
along; the result of the call is returned, and exceptions are
allowed to propogate cleanly, while ensuring that profiling is
disabled on the way out.
"""
return self._prof.runcall(func, args, kw)
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