import os import sys import pwd import time import fcntl import shutil import logging from threading import Lock, Thread as baseThread from errno import EACCES, EAGAIN, EPIPE, ENOTCONN, ECONNABORTED, EINTR, errorcode from signal import signal, SIGTERM, SIGKILL from time import sleep import select as oselect from os import waitpid as owaitpid try: from cPickle import PickleError except ImportError: # py 3 from pickle import PickleError from gconf import gconf try: # py 3 from urllib import parse as urllib except ImportError: import urllib def escape(s): """the chosen flavor of string escaping, used all over to turn whatever data to creatable representation""" return urllib.quote_plus(s) def unescape(s): """inverse of .escape""" 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): """open @fname + contest for its fcntl lock @content: if given, set the file content to it """ # 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): """.grabfile customization for pid files""" 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): """all those messy final steps we go trough upon termination Do away with pidfile, ssh control dir and logging. """ 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) if getattr(gconf, 'state_socket', None): try: os.unlink(gconf.state_socket) except: if sys.exc_info()[0] == OSError: pass if gconf.log_exit: logging.info("exiting.") sys.stdout.flush() sys.stderr.flush() os._exit(kw.get('exval', 0)) def log_raise_exception(excont): """top-level exception handler Try to some fancy things to cover up we face with an error. Translate some weird sounding but well understood exceptions into human-friendly lingo """ is_filelog = False for h in logging.getLogger().handlers: fno = getattr(getattr(h, 'stream', None), 'fileno', None) if fno and not os.isatty(fno()): is_filelog = True exc = sys.exc_info()[1] if isinstance(exc, SystemExit): excont.exval = exc.code or 0 raise else: logtag = None if isinstance(exc, GsyncdError): if is_filelog: logging.error(exc.args[0]) sys.stderr.write('failure: ' + exc.args[0] + '\n') elif isinstance(exc, PickleError) or isinstance(exc, EOFError) or \ ((isinstance(exc, OSError) or isinstance(exc, IOError)) and \ exc.errno == EPIPE): logging.error('connection to peer is broken') if hasattr(gconf, 'transport'): gconf.transport.wait() if gconf.transport.returncode == 127: logging.warn("!!!!!!!!!!!!!") logging.warn('!!! getting "No such file or directory" errors ' "is most likely due to MISCONFIGURATION, please consult " "http://access.redhat.com/knowledge/docs/en-US/Red_Hat_Storage/2.0/html/Administration_Guide/chap-User_Guide-Geo_Rep-Preparation-Settingup_Environment.html") logging.warn("!!!!!!!!!!!!!") gconf.transport.terminate_geterr() elif isinstance(exc, OSError) and exc.errno in (ENOTCONN, ECONNABORTED): logging.error('glusterfs session went down [%s]', errorcode[exc.errno]) else: logtag = "FAIL" if not logtag and logging.getLogger().isEnabledFor(logging.DEBUG): logtag = "FULL EXCEPTION TRACE" if logtag: logging.exception(logtag + ": ") 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.items(): setattr(self, k, v) class Thread(baseThread): """thread class flavor for gsyncd - always a daemon thread - force exit for whole program if thread function coughs up an exception """ 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) class GsyncdError(Exception): pass def getusername(uid = None): if uid == None: uid = os.geteuid() return pwd.getpwuid(uid).pw_name def privileged(): return os.geteuid() == 0 def boolify(s): """ Generic string to boolean converter return - Quick return if string 's' is of type bool - True if it's in true_list - False if it's in false_list - Warn if it's not present in either and return False """ true_list = ['true', 'yes', '1', 'on'] false_list = ['false', 'no', '0', 'off'] if isinstance(s, bool): return s rv = False lstr = s.lower() if lstr in true_list: rv = True elif not lstr in false_list: logging.warn("Unknown string (%s) in string to boolean conversion defaulting to False\n" % (s)) return rv def eintr_wrap(func, exc, *a): """ wrapper around syscalls resilient to interrupt caused by signals """ while True: try: return func(*a) except exc: ex = sys.exc_info()[1] if not ex.args[0] == EINTR: raise def select(*a): return eintr_wrap(oselect.select, oselect.error, *a) def waitpid (*a): return eintr_wrap(owaitpid, OSError, *a) def set_term_handler(hook=lambda *a: finalize(*a, **{'exval': 1})): signal(SIGTERM, hook)