def __init__(self, zkservers, config_path):
self._signal_notifier = os.pipe()
signal.set_wakeup_fd(self._signal_notifier[1])
signal.signal(signal.SIGCHLD, self._sigchld)
zh = zkwrapper.ZKWrapper(zkservers)
core.set_default_zkwrapper(zh)
core.set_default_ping_fd(self._signal_notifier[1])
self._inotify_watcher = InotifyWatcher([config_path], ConfigFile,
self._is_config_file)
self._sigchld_received = False
def __init__(self, zkservers, config_path):
self._signal_notifier = os.pipe()
signal.set_wakeup_fd(self._signal_notifier[1])
signal.signal(signal.SIGCHLD, self._sigchld)
zh = zkwrapper.ZKWrapper(zkservers)
core.set_default_zkwrapper(zh)
core.set_default_ping_fd(self._signal_notifier[1])
self._inotify_watcher = InotifyWatcher([config_path], ConfigFile,
self._is_config_file)
self._sigchld_received = False
class Twitcher(object):
"""The main operating loop of the twitcher program.
Args:
zkservers: A comma separated list of zookeeper servers to connect too.
config_path: The path to (recursively) read config files from.
"""
def __init__(self, zkservers, config_path):
self._signal_notifier = os.pipe()
signal.set_wakeup_fd(self._signal_notifier[1])
signal.signal(signal.SIGCHLD, self._sigchld)
zh = zkwrapper.ZKWrapper(zkservers)
core.set_default_zkwrapper(zh)
core.set_default_ping_fd(self._signal_notifier[1])
self._inotify_watcher = InotifyWatcher([config_path], ConfigFile,
self._is_config_file)
self._sigchld_received = False
def _is_config_file(self, filename):
"""Returns True if the file name is a twitcher config file."""
return filename.endswith('.twc')
def _sigchld(self, sig, frame):
"""Called when a SIGCHLD signal has been received."""
signal.signal(signal.SIGCHLD, self._sigchld)
self._sigchld_received = True
def _get_all_config_objects(self):
"""Returns a list of all config objects loaded."""
watch_files = self._inotify_watcher.files()
r = []
for w in watch_files:
r += w.get_configurations()
return r
def run(self):
"""The main running loop of the twitcher process. Doesn't return."""
while True:
# If we received SIGCHLD then we should allow our config modules
# to reap all children.
if self._sigchld_received:
for c in self._get_all_config_objects():
c.sigchld()
self._sigchld_received = False
# We add our notified file descriptor by default so select will exit
# when sigchld is received.
r_fds = [self._signal_notifier[0]]
w_fds = []
# We automatically check process timeouts every 5 minutes if no other
# action has happened. This ensures that processes clean up.
timeout = 60
for c in self._get_all_config_objects():
timeout = min((timeout, c.next_timeout()))
cr, cw = c.get_fds()
r_fds += cr
w_fds += cw
try:
iready, oready, e = select.select(r_fds, w_fds, [], timeout)
if not iready and not oready and not e:
logging.debug('select loop timed out without updates.')
for c in self._get_all_config_objects():
c.timeout()
else:
if self._signal_notifier[0] in iready:
os.read(self._signal_notifier[0], 1)
for c in self._get_all_config_objects():
c.select(iready, oready)
except select.error, v:
if v[0] != errno.EINTR:
raise
class Twitcher(object):
"""The main operating loop of the twitcher program.
Args:
zkservers: A comma separated list of zookeeper servers to connect too.
config_path: The path to (recursively) read config files from.
"""
def __init__(self, zkservers, config_path):
self._signal_notifier = os.pipe()
signal.set_wakeup_fd(self._signal_notifier[1])
signal.signal(signal.SIGCHLD, self._sigchld)
zh = zkwrapper.ZKWrapper(zkservers)
core.set_default_zkwrapper(zh)
core.set_default_ping_fd(self._signal_notifier[1])
self._inotify_watcher = InotifyWatcher([config_path], ConfigFile,
self._is_config_file)
self._sigchld_received = False
def _is_config_file(self, filename):
"""Returns True if the file name is a twitcher config file."""
return filename.endswith('.twc')
def _sigchld(self, sig, frame):
"""Called when a SIGCHLD signal has been received."""
signal.signal(signal.SIGCHLD, self._sigchld)
self._sigchld_received = True
def _get_all_config_objects(self):
"""Returns a list of all config objects loaded."""
watch_files = self._inotify_watcher.files()
r = []
for w in watch_files:
r += w.get_configurations()
return r
def run(self):
"""The main running loop of the twitcher process. Doesn't return."""
while True:
# If we received SIGCHLD then we should allow our config modules
# to reap all children.
if self._sigchld_received:
for c in self._get_all_config_objects():
c.sigchld()
self._sigchld_received = False
# We add our notified file descriptor by default so select will exit
# when sigchld is received.
r_fds = [self._signal_notifier[0]]
w_fds = []
# We automatically check process timeouts every 5 minutes if no other
# action has happened. This ensures that processes clean up.
timeout = 60
for c in self._get_all_config_objects():
timeout = min((timeout, c.next_timeout()))
cr, cw = c.get_fds()
r_fds += cr
w_fds += cw
try:
iready, oready, e = select.select(r_fds, w_fds, [], timeout)
if not iready and not oready and not e:
logging.debug('select loop timed out without updates.')
for c in self._get_all_config_objects():
c.timeout()
else:
if self._signal_notifier[0] in iready:
os.read(self._signal_notifier[0], 1)
for c in self._get_all_config_objects():
c.select(iready, oready)
except select.error, v:
if v[0] != errno.EINTR:
raise
