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#!/usr/bin/env python3
# vim: set expandtab shiftwidth=4:
# -*- Mode: python; coding: utf-8; indent-tabs-mode: nil -*- */
#
# Copyright © 2018 Red Hat, Inc.
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice (including the next
# paragraph) shall be included in all copies or substantial portions of the
# Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
import os
import sys
import time
import multiprocessing
import argparse
try:
import libevdev
import yaml
except ModuleNotFoundError as e:
print('Error: {}'.format(e), file=sys.stderr)
print('One or more python modules are missing. Please install those '
'modules and re-run this tool.')
sys.exit(1)
SUPPORTED_FILE_VERSION = 1
def error(msg, **kwargs):
print(msg, **kwargs, file=sys.stderr)
class YamlException(Exception):
pass
def fetch(yaml, key):
'''Helper function to avoid confusing a YAML error with a
normal KeyError bug'''
try:
return yaml[key]
except KeyError:
raise YamlException('Failed to get \'{}\' from recording.'.format(key))
def create(device):
evdev = fetch(device, 'evdev')
d = libevdev.Device()
d.name = fetch(evdev, 'name')
ids = fetch(evdev, 'id')
if len(ids) != 4:
raise YamlException('Invalid ID format: {}'.format(ids))
d.id = dict(zip(['bustype', 'vendor', 'product', 'version'], ids))
codes = fetch(evdev, 'codes')
for evtype, evcodes in codes.items():
for code in evcodes:
data = None
if evtype == libevdev.EV_ABS.value:
values = fetch(evdev, 'absinfo')[code]
absinfo = libevdev.InputAbsInfo(minimum=values[0],
maximum=values[1],
fuzz=values[2],
flat=values[3],
resolution=values[4])
data = absinfo
elif evtype == libevdev.EV_REP.value:
if code == libevdev.EV_REP.REP_DELAY.value:
data = 500
elif code == libevdev.EV_REP.REP_PERIOD.value:
data = 20
d.enable(libevdev.evbit(evtype, code), data=data)
uinput = d.create_uinput_device()
return uinput
def print_events(devnode, indent, evs):
devnode = os.path.basename(devnode)
for e in evs:
print("{}: {}{:06d}.{:06d} {} / {:<20s} {:4d}".format(
devnode, ' ' * (indent * 8), e.sec, e.usec, e.type.name, e.code.name, e.value))
def replay(device, verbose):
events = fetch(device, 'events')
if events is None:
return
uinput = device['__uinput']
offset = time.time()
# each 'evdev' set contains one SYN_REPORT so we only need to check for
# the time offset once per event
for event in events:
try:
evdev = fetch(event, 'evdev')
except YamlException:
continue
(sec, usec, evtype, evcode, value) = evdev[0]
evtime = sec + usec/1e6 + offset
now = time.time()
if evtime - now > 150/1e6: # 150 µs error margin
time.sleep(evtime - now - 150/1e6)
evs = [libevdev.InputEvent(libevdev.evbit(e[2], e[3]), value=e[4], sec=e[0], usec=e[1]) for e in evdev]
uinput.send_events(evs)
if verbose:
print_events(uinput.devnode, device['__index'], evs)
def wrap(func, *args):
try:
func(*args)
except KeyboardInterrupt:
pass
def loop(args, recording):
version = fetch(recording, 'version')
if version != SUPPORTED_FILE_VERSION:
raise YamlException('Invalid file format: {}, expected {}'.format(version, SUPPORTED_FILE_VERSION))
ndevices = fetch(recording, 'ndevices')
devices = fetch(recording, 'devices')
if ndevices != len(devices):
error('WARNING: truncated file, expected {} devices, got {}'.format(ndevices, len(devices)))
for idx, d in enumerate(devices):
uinput = create(d)
print('{}: {}'.format(uinput.devnode, uinput.name))
d['__uinput'] = uinput # cheaper to hide it in the dict then work around it
d['__index'] = idx
stop = False
while not stop:
input('Hit enter to start replaying')
processes = []
for d in devices:
p = multiprocessing.Process(target=wrap, args=(replay, d, args.verbose))
processes.append(p)
for p in processes:
p.start()
for p in processes:
p.join()
del processes
def main():
parser = argparse.ArgumentParser(
description='Replay a device recording'
)
parser.add_argument('recording', metavar='recorded-file.yaml',
type=str, help='Path to device recording')
parser.add_argument('--verbose', action='store_true')
args = parser.parse_args()
try:
with open(args.recording) as f:
y = yaml.safe_load(f)
loop(args, y)
except KeyboardInterrupt:
pass
except (PermissionError, OSError) as e:
error('Error: failed to open device: {}'.format(e))
except YamlException as e:
error('Error: failed to parse recording: {}'.format(e))
if __name__ == '__main__':
main()
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