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#!python3
import contextlib
import os
import queue
import re
import selectors
import shutil
import subprocess
import tarfile
import threading
from logging import debug, info, warning, critical
from enum import Enum, auto as enum_auto
class TarLzipExtractor:
class State(Enum):
IDLE = enum_auto()
ONGOING = enum_auto()
class Command(Enum):
STOP = enum_auto()
def __init__(self, output_dir):
self.output_dir = output_dir
self.state_lock = threading.Lock()
self.state = self.State.IDLE
self.queue = queue.Queue(maxsize=10)
self.progress_lock = threading.Lock()
self.progress = 0
def _thread_worker(self, *args):
lzip_proc = tar_proc = None
try:
lzip_command = '/usr/bin/lzip'
plzip_command = '/usr/bin/plzip'
if os.path.exists(plzip_command):
lzip_command = plzip_command
lzip_proc = subprocess.Popen(
(lzip_command, '-d'),
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
)
tar_proc = subprocess.Popen(
('tar', '-C', self.output_dir, '-xf', '-'),
stdin=lzip_proc.stdout,
)
filepath = f'{self.output_dir}/{self.filename}'
filesize = os.stat(filepath).st_size
progress = 0
with open(filepath, 'rb') as fobj:
while True:
with contextlib.suppress(queue.Empty):
queue_command = self.queue.get_nowait()
if queue_command == self.Command.STOP:
return
data = fobj.read(131072) # 128kib chunks
if len(data) == 0:
lzip_proc.stdin.close()
return
lzip_proc.stdin.write(data)
with self.progress_lock:
self.progress = filesize / fobj.tell()
finally:
with self.state_lock:
self.state = self.State.IDLE
# first terminate all, then wait all, quicker than terminate/wait
# for each.
lzip_proc or lzip_proc.terminate()
tar_proc or tar_proc.terminate()
lzip_proc or lzip_proc.wait()
tar_proc or tar_proc.wait()
def start(self, filename):
with self.state_lock:
if self.state == self.State.ONGOING:
return
self.state = self.State.ONGOING
self.filename = filename
self.thread = threading.Thread(
target=self._thread_worker,
daemon=True)
self.thread.start()
def stop(self):
with self.state_lock:
if self.state != self.State.ONGOING:
return
self.state = self.State.IDLE
self.queue.put(self.Command.STOP)
def poll(self):
with self.state_lock, self.progress_lock:
return self.state, self.progress
class RsyncManager:
rsync_progress_re = re.compile(r'\s(\d+)%\s')
class State(Enum):
IDLE = enum_auto()
ONGOING = enum_auto()
def __init__(self, repository_host, repository_path, gamedir):
self.selector = selectors.DefaultSelector()
self.repository_host = repository_host
self.repository_path = repository_path
self.gamedir = gamedir
self.state = self.State.IDLE
self.proc = None
self.package_name = None
self.last_progress = 0
def start(self, package_name):
'returns True when package_name is being installed'
if self.state == self.State.ONGOING:
return
self.package_name = package_name
command = (
'rsync',
'-a',
'--partial',
'--info=progress2',
f'{self.repository_host}:{self.repository_path}/{package_name}',
f'{self.gamedir}/.',
)
debug('running command %s', command)
self.proc = subprocess.Popen(
command,
stdout=subprocess.PIPE,
encoding='utf8')
self.selector.register(self.proc.stdout, selectors.EVENT_READ)
self.last_progress = 0
self.state = self.State.ONGOING
return True
def stop(self):
if self.state == self.State.IDLE:
return
if self.proc.poll() is None:
debug('terminating unfinished game install process for %s',
self.package_name)
self.proc.terminate()
proc_return_code = self.proc.wait()
debug('game install process return status %d', proc_return_code)
self.selector.unregister(self.proc.stdout)
self.proc = None
self.install_ongoing = False
def poll(self):
if self.state == self.State.IDLE:
return self.state, self.last_progress
proc = self.proc
if proc.poll() is not None:
self.stop()
self.state = self.State.IDLE
return self.state, 100
if not any(key
for key, mask in self.selector.select(timeout=0)
if mask & selectors.EVENT_READ and key.fileobj == proc.stdout):
return self.state, self.last_progress
# stdout.readline is a blocking call if there is no endline in
# stdout outputed by the subprocess.
# normally rsync output should be line buffered thus at any read event
# a call to readline should not block (or not long enough to be
# visible in a gui).
line = proc.stdout.readline()
if match := self.rsync_progress_re.search(line):
progress = int(match.group(1))
self.last_progress = progress
return self.state, self.last_progress
class GameArchiveRemover:
def __init__(self, gamedir):
self.gamedir = gamedir
def start(self, package_name):
pass
def stop(self):
pass
def poll(self):
pass
class GameInstaller:
class State(Enum):
IDLE = enum_auto()
ONGOING = enum_auto()
def __init__(self, repository_host, repository_path, gamedir):
self.state = self.State.IDLE
self.step = None
self.steps = (
RsyncManager(
repository_host=repository_host,
repository_path=repository_path,
gamedir=gamedir
),
TarLzipExtractor(output_dir=gamedir),
)
def start(self, package_name):
if self.state == self.State.ONGOING:
return
self.step = 0
self.steps[self.step].start(package_name)
self.package_name = package_name
self.state = self.State.ONGOING
#self.rsync_manager.start(package_name)
#self.current_sub_process = self.rsync_manager
return True
def stop(self):
if self.state == self.State.IDLE:
return
self.steps[self.step].stop()
#self.current_sub_process.stop()
self.state = self.State.IDLE
def poll(self):
'update internal state and returns current state'
if self.state == self.State.IDLE:
return self.State.IDLE, 100, 100
sub_state, sub_progress = self.steps[self.step].poll()
if sub_state == self.steps[self.step].State.IDLE:
self.step += 1
if self.step >= len(self.steps):
self.state = self.State.IDLE
return self.State.IDLE, 100, 100
self.steps[self.step].start(self.package_name)
sub_progress = 0
return self.state, (self.step/len(self.steps))*100, sub_progress
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