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collectd_systemd.py
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collectd_systemd.py
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import dbus
import collectd
class SystemD(object):
def __init__(self):
self.plugin_name = 'systemd'
self.interval = 60.0
self.verbose_logging = False
self.scan_needreload = False
self.needreload_ignore = []
self.services = []
self.units = {}
self.manager_properties = None
def log_verbose(self, msg):
if not self.verbose_logging:
return
collectd.info('{} plugin [verbose]: {}'.format(self.plugin_name, msg))
def init_dbus(self):
self.units = {}
self.bus = dbus.SystemBus()
self.manager = dbus.Interface(self.bus.get_object('org.freedesktop.systemd1',
'/org/freedesktop/systemd1'),
'org.freedesktop.systemd1.Manager')
def get_unit(self, name, path=None):
if name not in self.units:
if not path:
path = self.manager.LoadUnit(name)
try:
unit = dbus.Interface(self.bus.get_object('org.freedesktop.systemd1',
path),
'org.freedesktop.DBus.Properties')
except dbus.exceptions.DBusException as e:
collectd.warning('{} plugin: failed to monitor unit {}: {}'.format(
self.plugin_name, name, e))
return
self.units[name] = unit
return self.units[name]
def get_service_state(self, name):
unit = self.get_unit(name)
if not unit:
return 'broken'
else:
try:
return unit.Get('org.freedesktop.systemd1.Unit', 'SubState')
except dbus.exceptions.DBusException as e:
self.log_verbose('{} plugin: failed to monitor unit {}: {}'.format(self.plugin_name, name, e))
return 'broken'
def get_service_type(self, name):
unit = self.get_unit(name)
if not unit:
return 'broken'
else:
try:
return unit.Get('org.freedesktop.systemd1.Service', 'Type')
except dbus.exceptions.DBusException as e:
self.log_verbose('{} plugin: failed to find type unit {}: {}'.format(self.plugin_name, name, e))
return 'broken'
def get_system_state(self):
if self.manager_properties == None:
self.manager_properties = self.bus.get_object('org.freedesktop.systemd1', '/org/freedesktop/systemd1')
try:
state = self.manager_properties.Get('org.freedesktop.systemd1.Manager', 'SystemState', dbus_interface='org.freedesktop.DBus.Properties')
except dbus.exceptions.DBusException as e:
self.log_verbose('{} plugin: failed to monitor system state: {}'.format(self.plugin_name, e))
# Reset for re-trying
self.manager_properties = None
return 'broken'
return state
def send_need_reload(self):
try:
units = self.manager.ListUnits()
except dbus.exceptions.DBusException as e:
collectd.warning('{} plugin: failed to list units: {}'.format(
self.plugin_name, e))
return False
need_reload = False
for unit in units:
name, _, _, _, _, _, path, _, _, _ = unit
if name in self.needreload_ignore:
continue
unit = self.get_unit(name, path=path)
try:
rel = unit.Get('org.freedesktop.systemd1.Unit', 'NeedDaemonReload')
except dbus.exceptions.DBusException as e:
collectd.warning('{} plugin: failed to get unit properties {}: {}'.format(
self.plugin_name, name, e))
rel = True
if rel:
collectd.info('{} plugin [info]: Unit needs reload: {}'.format(self.plugin_name, name))
need_reload = True
# 1 = good 0 = bad
need_reload = not need_reload
val = collectd.Values(
type='boolean',
plugin=self.plugin_name,
plugin_instance='needreload',
type_instance='NeedDaemonReload',
values=[need_reload],
)
val.dispatch()
return True
def configure_callback(self, conf):
for node in conf.children:
vals = [str(v) for v in node.values]
if node.key == 'Service':
self.services.extend(vals)
elif node.key == 'Interval':
self.interval = float(vals[0])
elif node.key == 'Verbose':
self.verbose_logging = (vals[0].lower() == 'true')
elif node.key == 'ScanNeedReload':
self.scan_needreload = (vals[0].lower() == 'true')
elif node.key == 'NeedReloadIgnore':
self.needreload_ignore.extend(vals)
else:
raise ValueError('{} plugin: Unknown config key: {}'
.format(self.plugin_name, node.key))
if not self.services:
self.log_verbose('No services defined in configuration')
return
self.init_dbus()
collectd.register_read(self.read_callback, self.interval)
self.log_verbose('Configured with services={}, interval={}'
.format(self.services, self.interval))
def send_system_state(self):
state = self.get_system_state()
if state == "broken":
# Retry once more
self.init_dbus()
state = self.get_system_state()
value = 0 if state == "broken" or state == "degraded" else 1
self.log_verbose('Sending value: {}.systemd_state={} (state={}, type={})'
.format(self.plugin_name, value, state, type))
stateval = collectd.Values(
type='boolean',
plugin=self.plugin_name,
plugin_instance='systemd_state',
type_instance='running',
values=[value])
stateval.dispatch()
def read_callback(self):
self.log_verbose('Read callback called')
self.send_system_state()
if self.scan_needreload:
ok = self.send_need_reload()
if not ok:
# Dbus connection was broken, reconnect and retry
self.init_dbus()
self.send_need_reload()
for name in self.services:
full_name = name + '.service'
state = self.get_service_state(full_name)
type = self.get_service_type(full_name)
if state == 'broken':
self.log_verbose ('Unit {0} reported as broken. Reinitializing the connection to dbus & retrying.'.format(full_name))
self.init_dbus()
state = self.get_service_state(full_name)
value = (1.0 if state == 'running' or state == 'auto-restart' or state == 'reload' or state == 'start' or ( state == 'dead' and type == 'oneshot' ) else 0.0)
self.log_verbose('Sending value: {}.{}={} (state={}, type={})'
.format(self.plugin_name, name, value, state, type))
val = collectd.Values(
type='gauge',
plugin=self.plugin_name,
plugin_instance=name,
type_instance='running',
values=[value])
val.dispatch()
mon = SystemD()
collectd.register_config(mon.configure_callback)