ETW is a tracing facility that allows a user to log events to a file or buffer. An overview of ETW can be found here. The basic architecture includes an Provider, Controller, and a Consumer. The controller defines and controls a capture session. This includes what providers are in the as well as starting and stopping the session. The provider, specified using a GUID (Globally Unique Identifier), logs events to a series of buffers. The Consumer receives messages either from a buffer or a file and processes them in chronological order.
This module is an entirely Python-based ctypes wrapper around the Win32 APIs necessary for for controlling ETW sessions and processing message data. The module is very flexible and can set pre or post capture filters.
To use this module import etw and create an instance of the ETW class by passing in a list of ProviderInfo instances for the provider(s) you wish to capture data from. To process data returned from ETW you will need to specify a callback.
import etw
def some_func():
# define capture provider info
providers = [etw.ProviderInfo('Some Provider', etw.GUID("{11111111-1111-1111-1111-111111111111}"))]
# create instance of ETW and start capture
with etw.ETW(providers=providers, event_callback=etw.on_event_callback):
# run capture
etw.run('etw')
Below is an example using the module to perform a capture using a custom callback.
import time
import etw
def some_func():
# define capture provider info
providers = [etw.ProviderInfo('Some Provider', etw.GUID("{11111111-1111-1111-1111-111111111111}"))]
# create instance of ETW class
job = etw.ETW(providers=providers, event_callback=lambda x: print(x))
# start capture
job.start()
# wait some time
time.sleep(5)
# stop capture
job.stop()
Subclassing is another handy way to define ETW capture classes.
import time
import etw
class MyETW(etw.ETW):
def __init__(self, event_callback):
# define capture provider info
providers = [etw.ProviderInfo('Some Provider', etw.GUID("{11111111-1111-1111-1111-111111111111}"))]
super().__init__(providers=providers, event_callback=event_callback)
def start(self):
# do pre-capture setup
self.do_capture_setup()
super().start()
def stop(self):
super().stop()
# do post-capture teardown
self.do_capture_teardown()
def do_capture_setup(self):
# do whatever setup for capture here
pass
def do_capture_teardown(self):
# do whatever for capture teardown here
pass
def my_capture():
# instantiate class
capture = MyETW(lambda x: print(x))
# start capture
capture.start()
# wait some time to capture data
time.sleep(5)
# stop capture
capture.stop()
For more examples see examples.
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