def _get_env_value_ms(key, default_s):
try:
val = int(os.getenv(key, default_s * 1000)) / 1000
except:
val = -1
if val < 0:
fmt = 'invalid ${} value; {} seconds will be used'
dbg._pwarning(fmt.format(key, default_s))
val = default_s
return val
def _get_env_value_ms(key, default_s):
try:
val = int(os.getenv(key, default_s * 1000)) / 1000
except:
val = -1
if val < 0:
fmt = "invalid ${} value; {} seconds will be used"
dbg._pwarning(fmt.format(key, default_s))
val = default_s
return val
def __init__(self, name, host, port, reg_queue):
super(self.__class__, self).__init__()
self._name = name
self._host = host
self._port = port
try:
self._log_handler = lttngust.loghandler._Handler()
except (OSError) as e:
dbg._pwarning("cannot load library: {}".format(e))
raise e
self._root_logger = logging.getLogger()
self._root_logger.setLevel(logging.NOTSET)
self._ref_count = 0
self._sessiond_sock = None
self._reg_queue = reg_queue
self._server_cmd_handlers = {
lttngust.cmd._ServerCmdRegistrationDone: self._handle_server_cmd_reg_done,
lttngust.cmd._ServerCmdEnable: self._handle_server_cmd_enable,
lttngust.cmd._ServerCmdDisable: self._handle_server_cmd_disable,
lttngust.cmd._ServerCmdList: self._handle_server_cmd_list,
}
def __init__(self, name, host, port, reg_queue):
super(self.__class__, self).__init__()
self._name = name
self._host = host
self._port = port
try:
self._log_handler = lttngust.loghandler._Handler()
except (OSError) as e:
dbg._pwarning('cannot load library: {}'.format(e))
raise e
self._root_logger = logging.getLogger()
self._root_logger.setLevel(logging.NOTSET)
self._ref_count = 0
self._sessiond_sock = None
self._reg_queue = reg_queue
self._server_cmd_handlers = {
lttngust.cmd._ServerCmdRegistrationDone:
self._handle_server_cmd_reg_done,
lttngust.cmd._ServerCmdEnable: self._handle_server_cmd_enable,
lttngust.cmd._ServerCmdDisable: self._handle_server_cmd_disable,
lttngust.cmd._ServerCmdList: self._handle_server_cmd_list,
}
def _init_threads():
global _initialized
dbg._pdebug('entering')
if _initialized:
dbg._pdebug('agent is already initialized')
return
# This makes sure that the appropriate modules for encoding and
# decoding strings/bytes are imported now, since no import should
# happen within a thread at import time (our case).
'lttng'.encode().decode()
_initialized = True
sys_port = _get_port_from_file('/var/run/lttng/agent.port')
user_port_file = os.path.join(_get_user_home_path(), '.lttng',
'agent.port')
user_port = _get_port_from_file(user_port_file)
reg_queue = queue.Queue()
reg_expecting = 0
dbg._pdebug('system session daemon port: {}'.format(sys_port))
dbg._pdebug('user session daemon port: {}'.format(user_port))
if sys_port == user_port and sys_port is not None:
# The two session daemon ports are the same. This is not normal.
# Connect to only one.
dbg._pdebug('both user and system session daemon have the same port')
sys_port = None
try:
if sys_port is not None:
dbg._pdebug('creating system client thread')
t = threading.Thread(target=_client_thread_target,
args=('system', sys_port, reg_queue))
t.name = 'system'
t.daemon = True
t.start()
dbg._pdebug('created and started system client thread')
reg_expecting += 1
if user_port is not None:
dbg._pdebug('creating user client thread')
t = threading.Thread(target=_client_thread_target,
args=('user', user_port, reg_queue))
t.name = 'user'
t.daemon = True
t.start()
dbg._pdebug('created and started user client thread')
reg_expecting += 1
except:
# cannot create threads for some reason; stop this initialization
dbg._pwarning('cannot create client threads')
return
if reg_expecting == 0:
# early exit: looks like there's not even one valid port
dbg._pwarning(
'no valid LTTng session daemon port found (is the session daemon started?)'
)
return
cur_timeout = _REG_TIMEOUT
# We block here to make sure the agent is properly registered to
# the session daemon. If we timeout, the client threads will still
# continue to try to connect and register to the session daemon,
# but there is no guarantee that all following logging statements
# will make it to LTTng-UST.
#
# When a client thread receives a "registration done" confirmation
# from the session daemon it's connected to, it puts True in
# reg_queue.
while True:
try:
dbg._pdebug(
'waiting for registration done (expecting {}, timeout is {} s)'
.format(reg_expecting, cur_timeout))
t1 = lttngust.compat._clock()
reg_queue.get(timeout=cur_timeout)
t2 = lttngust.compat._clock()
reg_expecting -= 1
dbg._pdebug('unblocked')
if reg_expecting == 0:
# done!
dbg._pdebug('successfully registered to session daemon(s)')
break
cur_timeout -= (t2 - t1)
if cur_timeout <= 0:
# timeout
dbg._pdebug('ran out of time')
break
except queue.Empty:
dbg._pdebug('ran out of time')
break
dbg._pdebug('leaving')
def _init_threads():
global _initialized
dbg._pdebug("entering")
if _initialized:
dbg._pdebug("agent is already initialized")
return
# This makes sure that the appropriate modules for encoding and
# decoding strings/bytes are imported now, since no import should
# happen within a thread at import time (our case).
"lttng".encode().decode()
_initialized = True
sys_port = _get_port_from_file("/var/run/lttng/agent.port")
user_port_file = os.path.join(_get_user_home_path(), ".lttng", "agent.port")
user_port = _get_port_from_file(user_port_file)
reg_queue = queue.Queue()
reg_expecting = 0
dbg._pdebug("system session daemon port: {}".format(sys_port))
dbg._pdebug("user session daemon port: {}".format(user_port))
if sys_port == user_port and sys_port is not None:
# The two session daemon ports are the same. This is not normal.
# Connect to only one.
dbg._pdebug("both user and system session daemon have the same port")
sys_port = None
try:
if sys_port is not None:
dbg._pdebug("creating system client thread")
t = threading.Thread(target=_client_thread_target, args=("system", sys_port, reg_queue))
t.name = "system"
t.daemon = True
t.start()
dbg._pdebug("created and started system client thread")
reg_expecting += 1
if user_port is not None:
dbg._pdebug("creating user client thread")
t = threading.Thread(target=_client_thread_target, args=("user", user_port, reg_queue))
t.name = "user"
t.daemon = True
t.start()
dbg._pdebug("created and started user client thread")
reg_expecting += 1
except:
# cannot create threads for some reason; stop this initialization
dbg._pwarning("cannot create client threads")
return
if reg_expecting == 0:
# early exit: looks like there's not even one valid port
dbg._pwarning("no valid LTTng session daemon port found (is the session daemon started?)")
return
cur_timeout = _REG_TIMEOUT
# We block here to make sure the agent is properly registered to
# the session daemon. If we timeout, the client threads will still
# continue to try to connect and register to the session daemon,
# but there is no guarantee that all following logging statements
# will make it to LTTng-UST.
#
# When a client thread receives a "registration done" confirmation
# from the session daemon it's connected to, it puts True in
# reg_queue.
while True:
try:
dbg._pdebug(
"waiting for registration done (expecting {}, timeout is {} s)".format(reg_expecting, cur_timeout)
)
t1 = time.clock()
reg_queue.get(timeout=cur_timeout)
t2 = time.clock()
reg_expecting -= 1
dbg._pdebug("unblocked")
if reg_expecting == 0:
# done!
dbg._pdebug("successfully registered to session daemon(s)")
break
cur_timeout -= t2 - t1
if cur_timeout <= 0:
# timeout
dbg._pdebug("ran out of time")
break
except queue.Empty:
dbg._pdebug("ran out of time")
break
dbg._pdebug("leaving")