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# vim: expandtab ft=python ts=4 sw=4 sts=4:
import os
import sys
import subprocess
import time
from threading import Thread
from .import prints
__STATUSSTRINGS__ = {
0: "Not running",
1: "Starting",
2: "Running",
3: "Stopping",
}
__INPUTPIPE__ = 'input_pipe'
__STATUSFILE__ = 'status'
__PLAYERSFILE__ = 'players'
__PIDFILE__ = 'server.pid'
class MCWrapper:
"Minecraft server wrapper class"
def __init__(self, command, statusfile=False, playersfile=False):
self.players = set()
self.status = 0
self.process = None
self.command = command
self.statusfile = statusfile
self.plaersfile = playersfile
prints.info("Server wrapper initializing")
if os.path.isfile(__PIDFILE__):
with open(__PIDFILE__) as file:
lpid = int(file.readline())
try:
os.kill(lpid, 0)
except OSError:
prints.warning("Detected forced termination of previous server "
"wrapper instance.")
else:
prints.error("Another wrapper is running with given identifier.",
-1, 1)
try:
os.mkfifo(__INPUTPIPE__, 0o640)
except FileExistsError:
pass
if statusfile:
with open(__STATUSFILE__, 'w') as file:
file.write(__STATUSSTRINGS__[0] + '\n')
if playersfile:
open(__PLAYERSFILE__, 'w')
self.inputthread = Thread(target=self.__input_thread__,
daemon=True)
self.outputhread = Thread(target=self.__output_thread__,
daemon=True)
def clean(self):
"Cleans files generated by wrapper"
prints.info("Server wrapper clean.")
try:
os.remove(__INPUTPIPE__)
except FileNotFoundError:
pass
try:
os.remove(__PIDFILE__)
except FileNotFoundError:
pass
try:
os.remove(__STATUSFILE__)
except FileNotFoundError:
pass
try:
os.remove(__STATUSFILE__)
except FileNotFoundError:
pass
def execstart(self):
"Start execution of Minecraft server and hold until its exits"
self.start()
self.process.wait()
def start(self):
"Start Minecraft server"
self.process = subprocess.Popen(
self.command, stdin=subprocess.PIPE,
stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
start_new_session=False)
with open(__PIDFILE__, "w") as file:
file.write(str(self.process.pid))
self.status = 1
if self.statusfile:
with open(__STATUSFILE__, 'w') as file:
file.write(__STATUSSTRINGS__[1] + '\n')
if not self.inputthread.is_alive():
self.inputthread.start()
if not self.outputhread.is_alive():
self.outputhread.start()
def stop(self):
"Sends /stop command to Minecraft server"
if self.running():
self.process.stdin.write(bytes(
"/stop\n", sys.getdefaultencoding()))
self.process.stdin.flush()
def running(self):
"Returns True if mc server is running. Othervise False."
return bool(self.status)
def write_to_terminal(self, text):
"Write to server terminal. If server not running it does nothing"
if self.status == 2:
prints.info("Input: " + text, 1)
self.process.stdin.write(bytes(text, sys.getdefaultencoding()))
self.process.stdin.flush()
return True
else:
return False
def __user_join__(self, username):
prints.info("User '" + username + "' joined server.")
self.players.add(username)
if self.plaersfile:
with open(__PLAYERSFILE__, 'a') as file:
file.write(username + '\n')
def __user_leave__(self, username):
prints.info("User '" + username + "' left server.")
self.players.remove(username)
if self.plaersfile:
with open(__PLAYERSFILE__, 'w') as file:
file.writelines(self.players)
if self.players:
file.write('\n')
def __parse_line__(self, line):
if ': Done' in line:
prints.info("Server start.")
self.status = 2
if self.statusfile:
with open(__STATUSFILE__, 'w') as file:
file.write(__STATUSSTRINGS__[2] + '\n')
elif ': Stopping the server' in line:
prints.info("Server stop.")
self.status = 3
if self.statusfile:
with open(__STATUSFILE__, 'w') as file:
file.write(__STATUSSTRINGS__[3] + '\n')
elif 'logged in with entity id' in line:
name = line[len('[00:00:00] [Server thread/INFO]: '):]
name = name[:name.index('[')]
self.__user_join__(name)
elif 'left the game' in line:
name = line[len('[00:00:00] [Server thread/INFO]: '):]
name = name[:name.index(' ')]
self.__user_leave__(name)
def __output_thread__(self):
for linen in self.process.stdout:
line = linen.decode(sys.getdefaultencoding())
prints.info(line.rstrip(), 2, notime=True)
self.__parse_line__(line.rstrip())
if self.statusfile:
with open(__STATUSFILE__, 'w') as file:
file.write(__STATUSSTRINGS__[0] + '\n')
def __input_thread__(self):
with open(__INPUTPIPE__, 'r') as pipe:
while True:
line = pipe.readline().rstrip()
if line:
self.write_to_terminal(line + "\n")
else:
time.sleep(3)
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