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service.py
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service.py
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#!/usr/bin/env python3
#
# Copyright (c) 2020 Pierre Lebleu <pme.lebleu@gmail.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# * Neither the name of the copyright holder nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
from configparser import ConfigParser
import os
import sys
import time
DEFAULT_CONFIG_FILE="./conf/fakewebcam.ini"
def parse_config_file(config_file : str) -> dict:
"""
Parse the given config file and return its associated dictionary
"""
try:
config = ConfigParser()
config.read(config_file)
params = {
"config_file" : config_file,
"microservice_port" : "0",
"loopback_nr" : "10",
"loopback_name" : "Fakewebcam",
"loopback_exclusive" : "1",
"pid" : "/var/run/fakewebcam.pid",
}
params["config_file"] = os.path.realpath(config_file)
params["microservice_port"] = config["bodypix"]["service_port"]
params["loopback_nr"] = os.path.basename(config["loopback"]["device"]).split("video")[1]
params["loopback_name"] = config["loopback"]["name"]
params["loopback_exclusive"] = config["loopback"]["exclusive_caps"]
params["pid"] = config["daemon"]["pid"]
return params
except Exception as e:
print("ERROR: {}: {}".format(config_file, e))
exit(1)
def check_root() -> None:
"""Check if the EUID is 0"""
if os.geteuid() != 0:
print("Please run as root")
exit(1)
def build_docker(params) -> None:
"""Build the docker image used for the microservice"""
print("Building docker image...")
cmd = "cd bg_changer && docker build --tag bg_changer . >/dev/null 2>&1"
if os.system(cmd) == 0:
print(" Success !")
else:
print(" Failure !")
def clean(params) -> None:
"""Clean the docker images"""
print("Cleaning docker image...")
cmd = "docker rmi bg_changer >/dev/null 2>&1"
if os.system(cmd) == 0:
print(" Success !")
else:
print(" Failure !")
def start_microservice(params) -> None:
"""Start the docker containing the microservice"""
print("Starting microservice...")
cmd = "docker run --rm --publish " + params['microservice_port'] + ":" + \
params['microservice_port'] + " --detach --name bg_changer " + \
"--mount type=bind,source=" + params['config_file'] + \
",destination=/fakewebcam.ini bg_changer >/dev/null 2>&1"
if os.system(cmd) == 0:
print(" Success !")
else:
print(" Failure !")
def stop_microservice(params) -> None:
"""Stop the container associated to the microservice"""
print("Stopping microservice...")
if os.system("docker stop bg_changer >/dev/null 2>&1") == 0:
print(" Success !")
else:
print(" Failure !")
def check_microservice(params) -> None:
"""Check if the container associated to the microservice is running"""
cmd = "docker container inspect -f '{{.State.Running}}' bg_changer >/dev/null 2>&1"
if os.system(cmd) == 0:
print("Microservice is running")
else:
print("Microservice is NOT running")
def load_kernel_module(params) -> None:
"""Load the v4l2 kernel module"""
print("Loading kernel module...")
os.system("modprobe -r v4l2loopback >/dev/null 2>&1")
cmd = "modprobe v4l2loopback devices=1 video_nr=" + params['loopback_nr'] + \
" card_label=" + params['loopback_name'] + \
" exclusive_caps=" + params['loopback_exclusive'] + " >/dev/null 2>&1"
if os.system(cmd) == 0:
print(" Success !")
else:
print(" Failure !")
def unload_kernel_module(params) -> None:
"""Unload the v4l2 kernel module"""
print("Unloading kernel module...")
if os.system("modprobe -r v4l2loopback >/dev/null 2>&1") == 0:
print(" Success !")
else:
print(" Failure !")
def check_kernel_module(params) -> None:
"""Check if the v4l2 kernel module is loaded"""
if os.system("lsmod | grep v4l2loopback >/dev/null 2>&1") == 0:
print("Kernel module is loaded")
else:
print("Kernel module is NOT loaded")
def start_streamer(params) -> None:
"""Start the streamer program"""
print("Starting streamer...")
time.sleep(5)
cmd = "./streamer/fakewebcam.py -c " + params["config_file"] + " >/dev/null 2>&1"
if os.system(cmd) == 0:
print(" Success !")
else:
print(" Failure !")
def stop_streamer(params) -> None:
"""Stop the streamer program"""
print("Stopping streamer...")
try:
with open(params['pid'], 'r') as f:
pid = f.read()
cmd = "kill " + str(pid) + " >/dev/null 2>&1"
if os.system(cmd) == 0:
print(" Success !")
else:
print(" Failure !")
os.remove(params['pid'])
except Exception as e:
print(" Failure !")
def check_streamer(params) -> None:
"""Check if the streamer is running"""
try:
with open(params['pid'], "r") as f:
pid = f.read()
if os.path.isdir("/proc/" + str(pid)):
print("Streamer is running")
else:
print("Streamer is NOT running")
except Exception as e:
print("Streamer is NOT running")
def start(params) -> None:
"""Start the whole service"""
check_root()
start_microservice(params)
load_kernel_module(params)
start_streamer(params)
def stop(params) -> None:
"""Stop the whole service"""
check_root()
stop_streamer(params)
unload_kernel_module(params)
stop_microservice(params)
def usage() -> None:
"""Classical usage function"""
print("usage: start.py <build|start|stop|status|restart|clean> [config]")
exit(0)
if __name__ == "__main__":
try:
cmd = sys.argv[1]
if len(sys.argv) >= 3:
config_file = sys.argv[2]
else:
config_file = DEFAULT_CONFIG_FILE
except Exception as e:
usage()
params = parse_config_file(config_file)
if cmd == "build":
build_docker(params)
elif cmd == "start":
start(params)
elif cmd == "stop":
stop(params)
elif cmd == "status":
check_microservice(params)
check_kernel_module(params)
check_streamer(params)
elif cmd == "restart" or cmd == "reload":
stop(params)
time.sleep(5)
start(params)
elif cmd == "clean":
clean(params)
else:
print("Unknown command {}".format(cmd))
exit(1)