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import os
import sys
import time
import fcntl
import shutil
import logging
from threading import Lock, Thread as baseThread
from errno import EACCES, EAGAIN
from signal import SIGTERM, SIGKILL
from time import sleep
from gconf import gconf
try:
# py 3
from urllib import parse as urllib
except ImportError:
import urllib
def escape(s):
return urllib.quote_plus(s)
def unescape(s):
return urllib.unquote_plus(s)
def norm(s):
if s:
return s.replace('-', '_')
def update_file(path, updater, merger = lambda f: True):
"""update a file in a transaction-like manner"""
fr = fw = None
try:
fd = os.open(path, os.O_CREAT|os.O_RDWR)
try:
fr = os.fdopen(fd, 'r+b')
except:
os.close(fd)
raise
fcntl.lockf(fr, fcntl.LOCK_EX)
if not merger(fr):
return
tmpp = path + '.tmp.' + str(os.getpid())
fd = os.open(tmpp, os.O_CREAT|os.O_EXCL|os.O_WRONLY)
try:
fw = os.fdopen(fd, 'wb', 0)
except:
os.close(fd)
raise
updater(fw)
os.fsync(fd)
os.rename(tmpp, path)
finally:
for fx in (fr, fw):
if fx:
fx.close()
def grabfile(fname, content=None):
# damn those messy open() mode codes
fd = os.open(fname, os.O_CREAT|os.O_RDWR)
f = os.fdopen(fd, 'r+b', 0)
try:
fcntl.lockf(f, fcntl.LOCK_EX|fcntl.LOCK_NB)
except:
ex = sys.exc_info()[1]
f.close()
if isinstance(ex, IOError) and ex.errno in (EACCES, EAGAIN):
# cannot grab, it's taken
return
raise
if content:
try:
f.truncate()
f.write(content)
except:
f.close()
raise
gconf.permanent_handles.append(f)
return f
def grabpidfile(fname=None, setpid=True):
if not fname:
fname = gconf.pid_file
content = None
if setpid:
content = str(os.getpid()) + '\n'
return grabfile(fname, content=content)
final_lock = Lock()
def finalize(*a, **kw):
final_lock.acquire()
if getattr(gconf, 'pid_file', None):
rm_pidf = gconf.pid_file_owned
if gconf.cpid:
# exit path from parent branch of daemonization
rm_pidf = False
while True:
f = grabpidfile(setpid=False)
if not f:
# child has already taken over pidfile
break
if os.waitpid(gconf.cpid, os.WNOHANG)[0] == gconf.cpid:
# child has terminated
rm_pidf = True
break;
time.sleep(0.1)
if rm_pidf:
try:
os.unlink(gconf.pid_file)
except:
ex = sys.exc_info()[1]
if ex.errno == ENOENT:
pass
else:
raise
if gconf.ssh_ctl_dir and not gconf.cpid:
shutil.rmtree(gconf.ssh_ctl_dir)
sys.stdout.flush()
sys.stderr.flush()
os._exit(kw.get('exval', 0))
def log_raise_exception(excont):
exc = sys.exc_info()[1]
if isinstance(exc, SystemExit):
excont.exval = exc.code or 0
raise
else:
logging.exception("FAIL: ")
sys.stderr.write("failed with %s.\n" % type(exc).__name__)
excont.exval = 1
sys.exit(excont.exval)
class FreeObject(object):
"""wildcard class for which any attribute can be set"""
def __init__(self, **kw):
for k,v in kw.iteritems():
setattr(self, k, v)
class Thread(baseThread):
def __init__(self, *a, **kw):
tf = kw.get('target')
if tf:
def twrap(*aa):
excont = FreeObject(exval = 0)
try:
tf(*aa)
except:
try:
log_raise_exception(excont)
finally:
finalize(exval = excont.exval)
kw['target'] = twrap
baseThread.__init__(self, *a, **kw)
self.setDaemon(True)
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