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screen_server.py
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screen_server.py
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#!/usr/bin/env python3
import sys
import os
from http.server import BaseHTTPRequestHandler,HTTPServer
from socketserver import ThreadingMixIn
import threading
import argparse
import re
import cgi
import subprocess
import time
import json
LOGLEVEL = 0
def main():
#global args
parser = argparse.ArgumentParser(description='HTTP Server')
parser.add_argument('--port', type=int, default=8000, help='Listening port for HTTP Server')
parser.add_argument('--ip', default='0.0.0.0', help='HTTP Server IP')
parser.add_argument("-v", action="store_true", default=False, help="Print extra info")
parser.add_argument("-vv", action="store_true", default=False, help="Print (more) extra info")
args = parser.parse_args()
######################################
# Establish LOGLEVEL
######################################
global LOGLEVEL
if args.vv:
LOGLEVEL = 2
elif args.v:
LOGLEVEL = 1
# Initial xset environment
runCommandWithOutput(['xset', 'dpms', 's', '86400', '86400'], {'DISPLAY':':0'})
runCommandWithOutput(['xset', 'dpms', 'dpms', '1800', '1800', '1800'], {'DISPLAY':':0'})
server = SimpleHttpServer(args.ip, args.port)
log_debug('HTTP Server listening on {}:{}'.format(args.ip, args.port))
server.start()
server.waitForThread()
class HTTPRequestHandler(BaseHTTPRequestHandler):
def do_GET(self):
results = {}
if self.path == '/on':
(status, out, err) = runCommandWithOutput(['xset', 'dpms', 'force', 'on'], {'DISPLAY':':0'})
elif self.path == '/off':
(status, out, err) = runCommandWithOutput(['xset', 'dpms', 'force', 'off'], {'DISPLAY':':0'})
elif self.path.startswith('/set/'):
try:
timeout = int(self.path.split('/set/',1)[1])
except ValueError:
self.send_response(500)
self.send_header('Content-Type', 'application/json')
results['message'] = 'Must set integer value'
self.wfile.write(json.dumps(results).encode('utf-8'))
return
timeout = str(timeout)
(status, out, err) = runCommandWithOutput(['xset', 'dpms', timeout, timeout, timeout], {'DISPLAY':':0'})
else:
self.send_response(404)
self.send_header('Content-Type', 'application/json')
results['message'] = 'Invalid request'
self.wfile.write(json.dumps(results).encode('utf-8'))
return
self.send_response(200)
self.send_header('Content-Type', 'application/json')
results['status'] = status
results['cmd_out'] = str(out)
results['cmd_err'] = str(err)
self.wfile.write(json.dumps(results).encode('utf-8'))
if status==0 and out==b'' and err==b'':
log_debug("Command executed successfully")
else:
log_debug("Error: {}, Output: {}, Error: {}".format(status, out, err))
class ThreadedHTTPServer(ThreadingMixIn, HTTPServer):
allow_reuse_address = True
def shutdown(self):
self.socket.close()
HTTPServer.shutdown(self)
class SimpleHttpServer():
def __init__(self, ip, port):
self.server = ThreadedHTTPServer((ip,port), HTTPRequestHandler)
def start(self):
self.server_thread = threading.Thread(target=self.server.serve_forever)
self.server_thread.daemon = True
self.server_thread.start()
def waitForThread(self):
self.server_thread.join()
def stop(self):
self.server.shutdown()
self.waitForThread()
def runCommandWithOutput(parameterList, env={}, timeout=600):
my_env=os.environ.copy()
my_env.update(env)
if type(parameterList) != tuple and type(parameterList) != list: parameterList = [parameterList]
try:
p = subprocess.Popen(parameterList, env=my_env, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
except OSError as e:
sys.stderr.write("Error running outside process:\n %s\nErrno %s: %s\n" % (' '.join(parameterList), e.args[0], e.args[1]))
return False
timeExpired = False
stime = time.time()
while True:
time.sleep(0.25)
returnCode = p.poll()
if returnCode != None: break
if (time.time()-stime)>timeout:
timeExpired = True
break
output = p.communicate()
if timeExpired:
try:
import signal
p.send_signal(signal.SIGINT)
time.sleep(5)
returnCode = p.poll()
output = p.communicate()
if returnCode != None:
sys.stderr.write('Command exceeded timeout (%d s). Sent INT to process.' % (timeout))
return (returnCode, output[0], output[1])
except:
pass
try:
p.kill()
except:
pass
sys.stderr.write('Command exceeded timeout (%d s). Process terminated.\n' % (timeout))
return (returnCode, output[0], output[1])
##############################################################################
#
# Output and Logging Message Functions
#
##############################################################################
def log_fatal(msg, exit_code=-1):
sys.stderr.write("Fatal Err: %s\n" % msg)
sys.exit(exit_code)
def log_info(msg):
global LOGLEVEL
if LOGLEVEL > 0:
sys.stderr.write("Info: %s\n" % msg)
def log_error(msg):
sys.stderr.write("Error: %s\n" % msg)
def log_debug(msg):
global LOGLEVEL
if LOGLEVEL > 1:
sys.stderr.write("Debug: %s\n" % msg)
#
# Initial Setup and call to main()
#
if __name__ == '__main__':
sys.stdout = os.fdopen(sys.stdout.fileno(), 'w', 1) # reopen STDOUT unbuffered
try:
sys.exit(main())
except KeyboardInterrupt:
sys.exit(1)