def __init__(self, header, loglevel, loglevel_type, name, filter_exp):
super(self.__class__, self).__init__(header)
self.loglevel = loglevel
self.loglevel_type = loglevel_type
self.name = name
self.filter_expression = filter_exp
dbg._pdebug('server enable command {}'.format(self.__dict__))
def _handle_server_cmd_list(self, server_cmd):
dbg._pdebug(self._debug('got "list" server command'))
names = logging.Logger.manager.loggerDict.keys()
dbg._pdebug(self._debug('found {} loggers'.format(len(names))))
cmd_reply = lttngust.cmd._ClientCmdReplyList(names=names)
return cmd_reply
def _handle_server_cmd_list(self, server_cmd):
dbg._pdebug(self._debug('got "list" server command'))
names = logging.Logger.manager.loggerDict.keys()
dbg._pdebug(self._debug("found {} loggers".format(len(names))))
cmd_reply = lttngust.cmd._ClientCmdReplyList(names=names)
return cmd_reply
def __init__(self, header, loglevel, loglevel_type, name, filter_exp):
super(self.__class__, self).__init__(header)
self.loglevel = loglevel
self.loglevel_type = loglevel_type
self.name = name
self.filter_expression = filter_exp
dbg._pdebug('server enable command {}'.format(self.__dict__))
def _server_cmd_header_from_data(data):
try:
data_size, cmd_id, cmd_version = _server_cmd_header_struct.unpack(data)
except (Exception) as e:
dbg._pdebug('cannot decode command header: {}'.format(e))
return None
return _ServerCmdHeader(data_size, cmd_id, cmd_version)
def from_data(cls, header, data):
try:
name = data.rstrip(b'\0').decode()
return cls(header, name)
except (Exception) as e:
dbg._pdebug('cannot decode disable command: {}'.format(e))
return None
def from_data(cls, header, data):
try:
name = data.rstrip(b'\0').decode()
return cls(header, name)
except (Exception) as e:
dbg._pdebug('cannot decode disable command: {}'.format(e))
return None
def _server_cmd_header_from_data(data):
try:
data_size, cmd_id, cmd_version = _server_cmd_header_struct.unpack(data)
except (Exception) as e:
dbg._pdebug('cannot decode command header: {}'.format(e))
return None
return _ServerCmdHeader(data_size, cmd_id, cmd_version)
def from_data(cls, header, data):
try:
loglevel, loglevel_type = cls._loglevel_struct.unpack_from(data)
data_name = data[cls._loglevel_struct.size:]
name = data_name.rstrip(b'\0').decode()
return cls(header, loglevel, loglevel_type, name)
except (Exception) as e:
dbg._pdebug('cannot decode enable command: {}'.format(e))
return None
def from_data(cls, header, data):
try:
loglevel, loglevel_type = cls._loglevel_struct.unpack_from(data)
data_name = data[cls._loglevel_struct.size:]
name = data_name.rstrip(b'\0').decode()
return cls(header, loglevel, loglevel_type, name)
except (Exception) as e:
dbg._pdebug('cannot decode enable command: {}'.format(e))
return None
def _recv_server_cmd_header(self):
data = self._sessiond_sock.recv(lttngust.cmd._SERVER_CMD_HEADER_SIZE)
if not data:
dbg._pdebug(self._debug("received empty server command header"))
return None
assert len(data) == lttngust.cmd._SERVER_CMD_HEADER_SIZE
dbg._pdebug(self._debug("received server command header ({} bytes)".format(len(data))))
return lttngust.cmd._server_cmd_header_from_data(data)
def _recv_server_cmd_header(self):
data = self._sessiond_sock.recv(lttngust.cmd._SERVER_CMD_HEADER_SIZE)
if not data:
dbg._pdebug(self._debug('received empty server command header'))
return None
assert (len(data) == lttngust.cmd._SERVER_CMD_HEADER_SIZE)
dbg._pdebug(
self._debug('received server command header ({} bytes)'.format(
len(data))))
return lttngust.cmd._server_cmd_header_from_data(data)
def _handle_server_cmd_reg_done(self, server_cmd):
dbg._pdebug(self._debug('got "registration done" server command'))
if self._reg_queue is not None:
dbg._pdebug(self._debug('notifying _init_threads()'))
try:
self._reg_queue.put(True)
except (Exception) as e:
# read side could be closed by now; ignore it
pass
self._reg_queue = None
def _handle_server_cmd_reg_done(self, server_cmd):
dbg._pdebug(self._debug('got "registration done" server command'))
if self._reg_queue is not None:
dbg._pdebug(self._debug("notifying _init_threads()"))
try:
self._reg_queue.put(True)
except (Exception) as e:
# read side could be closed by now; ignore it
pass
self._reg_queue = None
def _get_port_from_file(path):
port = None
dbg._pdebug('reading port from file "{}"'.format(path))
try:
f = open(path)
r_port = int(f.readline())
f.close()
if r_port > 0 or r_port <= 65535:
port = r_port
except:
pass
return port
def _get_port_from_file(path):
port = None
dbg._pdebug('reading port from file "{}"'.format(path))
try:
f = open(path)
r_port = int(f.readline())
f.close()
if r_port > 0 or r_port <= 65535:
port = r_port
except:
pass
return port
def _handle_server_cmd(self, server_cmd):
cmd_reply = None
if server_cmd is None:
dbg._pdebug(self._debug("bad server command"))
status = lttngust.cmd._CLIENT_CMD_REPLY_STATUS_INVALID_CMD
cmd_reply = lttngust.cmd._ClientCmdReply(status)
elif type(server_cmd) in self._server_cmd_handlers:
cmd_reply = self._server_cmd_handlers[type(server_cmd)](server_cmd)
else:
dbg._pdebug(self._debug("unknown server command"))
status = lttngust.cmd._CLIENT_CMD_REPLY_STATUS_INVALID_CMD
cmd_reply = lttngust.cmd._ClientCmdReply(status)
if cmd_reply is not None:
self._send_cmd_reply(cmd_reply)
def _handle_server_cmd(self, server_cmd):
cmd_reply = None
if server_cmd is None:
dbg._pdebug(self._debug('bad server command'))
status = lttngust.cmd._CLIENT_CMD_REPLY_STATUS_INVALID_CMD
cmd_reply = lttngust.cmd._ClientCmdReply(status)
elif type(server_cmd) in self._server_cmd_handlers:
cmd_reply = self._server_cmd_handlers[type(server_cmd)](server_cmd)
else:
dbg._pdebug(self._debug('unknown server command'))
status = lttngust.cmd._CLIENT_CMD_REPLY_STATUS_INVALID_CMD
cmd_reply = lttngust.cmd._ClientCmdReply(status)
if cmd_reply is not None:
self._send_cmd_reply(cmd_reply)
def from_data(cls, header, data):
try:
loglevel, loglevel_type = cls._loglevel_struct.unpack_from(data)
name_start = cls._loglevel_struct.size
name_end = name_start + _LTTNG_SYMBOL_NAME_LEN
data_name = data[name_start:name_end]
name = data_name.rstrip(b'\0').decode()
filter_exp_start = name_end + cls._filter_exp_len_struct.size
filter_exp_len, = cls._filter_exp_len_struct.unpack_from(
data[name_end:filter_exp_start])
filter_exp_end = filter_exp_start + filter_exp_len
filter_exp = data[filter_exp_start:filter_exp_end].rstrip(
b'\0').decode()
return cls(header, loglevel, loglevel_type, name, filter_exp)
except (Exception) as e:
dbg._pdebug('cannot decode enable command: {}'.format(e))
return None
def from_data(cls, header, data):
try:
loglevel, loglevel_type = cls._loglevel_struct.unpack_from(data)
name_start = cls._loglevel_struct.size
name_end = name_start + _LTTNG_SYMBOL_NAME_LEN
data_name = data[name_start:name_end]
name = data_name.rstrip(b'\0').decode()
filter_exp_start = name_end + cls._filter_exp_len_struct.size
filter_exp_len, = cls._filter_exp_len_struct.unpack_from(
data[name_end:filter_exp_start])
filter_exp_end = filter_exp_start + filter_exp_len
filter_exp = data[filter_exp_start:filter_exp_end].rstrip(
b'\0').decode()
return cls(header, loglevel, loglevel_type, name, filter_exp)
except (Exception) as e:
dbg._pdebug('cannot decode enable command: {}'.format(e))
return None
def _handle_server_cmd_enable(self, server_cmd):
dbg._pdebug(self._debug('got "enable" server command'))
self._ref_count += 1
if self._ref_count == 1:
dbg._pdebug(self._debug("adding our handler to the root logger"))
self._root_logger.addHandler(self._log_handler)
dbg._pdebug(self._debug("ref count is {}".format(self._ref_count)))
return lttngust.cmd._ClientCmdReplyEnable()
def _handle_server_cmd_enable(self, server_cmd):
dbg._pdebug(self._debug('got "enable" server command'))
self._ref_count += 1
if self._ref_count == 1:
dbg._pdebug(self._debug('adding our handler to the root logger'))
self._root_logger.addHandler(self._log_handler)
dbg._pdebug(self._debug('ref count is {}'.format(self._ref_count)))
return lttngust.cmd._ClientCmdReplyEnable()
def run(self):
while True:
try:
# connect to the session daemon
dbg._pdebug(self._debug("connecting to session daemon"))
self._connect_to_sessiond()
# register to the session daemon after a successful connection
dbg._pdebug(self._debug("registering to session daemon"))
self._register()
# wait for commands from the session daemon
self._wait_server_cmd()
except (Exception) as e:
# Whatever happens here, we have to close the socket and
# retry to connect to the session daemon since either
# the socket was closed, a network timeout occured, or
# invalid data was received.
dbg._pdebug(self._debug("got exception: {}".format(e)))
self._cleanup_socket()
dbg._pdebug(self._debug("sleeping for {} s".format(_RETRY_REG_DELAY)))
time.sleep(_RETRY_REG_DELAY)
def _handle_server_cmd_disable(self, server_cmd):
dbg._pdebug(self._debug('got "disable" server command'))
self._ref_count -= 1
if self._ref_count < 0:
# disable command could be sent again when a session is destroyed
self._ref_count = 0
if self._ref_count == 0:
dbg._pdebug(self._debug("removing our handler from the root logger"))
self._root_logger.removeHandler(self._log_handler)
dbg._pdebug(self._debug("ref count is {}".format(self._ref_count)))
return lttngust.cmd._ClientCmdReplyDisable()
def _handle_server_cmd_disable(self, server_cmd):
dbg._pdebug(self._debug('got "disable" server command'))
self._ref_count -= 1
if self._ref_count < 0:
# disable command could be sent again when a session is destroyed
self._ref_count = 0
if self._ref_count == 0:
dbg._pdebug(
self._debug('removing our handler from the root logger'))
self._root_logger.removeHandler(self._log_handler)
dbg._pdebug(self._debug('ref count is {}'.format(self._ref_count)))
return lttngust.cmd._ClientCmdReplyDisable()
def run(self):
while True:
try:
# connect to the session daemon
dbg._pdebug(self._debug('connecting to session daemon'))
self._connect_to_sessiond()
# register to the session daemon after a successful connection
dbg._pdebug(self._debug('registering to session daemon'))
self._register()
# wait for commands from the session daemon
self._wait_server_cmd()
except (Exception) as e:
# Whatever happens here, we have to close the socket and
# retry to connect to the session daemon since either
# the socket was closed, a network timeout occured, or
# invalid data was received.
dbg._pdebug(self._debug('got exception: {}'.format(e)))
self._cleanup_socket()
dbg._pdebug(
self._debug('sleeping for {} s'.format(_RETRY_REG_DELAY)))
time.sleep(_RETRY_REG_DELAY)
def _recv_server_cmd(self):
server_cmd_header = self._recv_server_cmd_header()
if server_cmd_header is None:
return None
dbg._pdebug(self._debug("server command header: data size: {} bytes".format(server_cmd_header.data_size)))
dbg._pdebug(self._debug("server command header: command ID: {}".format(server_cmd_header.cmd_id)))
dbg._pdebug(self._debug("server command header: command version: {}".format(server_cmd_header.cmd_version)))
data = bytes()
if server_cmd_header.data_size > 0:
data = self._sessiond_sock.recv(server_cmd_header.data_size)
assert len(data) == server_cmd_header.data_size
return lttngust.cmd._server_cmd_from_data(server_cmd_header, data)
def _recv_server_cmd(self):
server_cmd_header = self._recv_server_cmd_header()
if server_cmd_header is None:
return None
dbg._pdebug(
self._debug('server command header: data size: {} bytes'.format(
server_cmd_header.data_size)))
dbg._pdebug(
self._debug('server command header: command ID: {}'.format(
server_cmd_header.cmd_id)))
dbg._pdebug(
self._debug('server command header: command version: {}'.format(
server_cmd_header.cmd_version)))
data = bytes()
if server_cmd_header.data_size > 0:
data = self._sessiond_sock.recv(server_cmd_header.data_size)
assert (len(data) == server_cmd_header.data_size)
return lttngust.cmd._server_cmd_from_data(server_cmd_header, data)
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")
def _send_cmd_reply(self, cmd_reply):
data = cmd_reply.get_data()
dbg._pdebug(self._debug("sending command reply ({} bytes)".format(len(data))))
self._sessiond_sock.sendall(data)
def _client_thread_target(name, port, reg_queue):
dbg._pdebug('creating client "{}" using TCP port {}'.format(name, port))
client = _TcpClient(name, _SESSIOND_HOST, port, reg_queue)
dbg._pdebug('starting client "{}"'.format(name))
client.run()
def _send_cmd_reply(self, cmd_reply):
data = cmd_reply.get_data()
dbg._pdebug(
self._debug('sending command reply ({} bytes)'.format(len(data))))
self._sessiond_sock.sendall(data)
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 _client_thread_target(name, port, reg_queue):
dbg._pdebug('creating client "{}" using TCP port {}'.format(name, port))
client = _TcpClient(name, _SESSIOND_HOST, port, reg_queue)
dbg._pdebug('starting client "{}"'.format(name))
client.run()