1 # -*- coding: utf-8 -*-
2 # Description: netdata python modules framework
3 # Author: Pawel Krupa (paulfantom)
6 # ALL CODE NEEDS TO BE COMPATIBLE WITH Python > 2.7 and Python > 3.1
7 # Follow PEP8 as much as it is possible
8 # "check" and "create" CANNOT be blocking.
9 # "update" CAN be blocking
10 # "update" function needs to be fast, so follow:
11 # https://wiki.python.org/moin/PythonSpeed/PerformanceTips
13 # - use local variables wherever it is possible
14 # - avoid dots in expressions that are executed many times
15 # - use "join()" instead of "+"
16 # - use "import" only at the beginning
18 # using ".encode()" in one thread can block other threads as well (only in python2)
26 import urllib.request as urllib2
30 from subprocess import Popen, PIPE
36 # class BaseService(threading.Thread):
37 class SimpleService(threading.Thread):
39 Prototype of Service class.
40 Implemented basic functionality to run jobs by `python.d.plugin`
42 def __init__(self, configuration=None, name=None):
44 This needs to be initialized in child classes
45 :param configuration: dict
48 threading.Thread.__init__(self)
49 self._data_stream = ""
53 self.priority = 140000
56 self.override_name = None
60 self.__chart_set = False
61 self.__first_run = True
64 if configuration is None:
65 self.error("BaseService: no configuration parameters supplied. Cannot create Service.")
68 self._extract_base_config(configuration)
70 self.create_timetable()
72 # --- BASIC SERVICE CONFIGURATION ---
74 def _extract_base_config(self, config):
76 Get basic parameters to run service
78 config = {'update_every':1,
85 self.override_name = pop('name')
88 self.update_every = int(pop('update_every'))
89 self.priority = int(pop('priority'))
90 self.retries = int(pop('retries'))
91 self.retries_left = self.retries
92 self.configuration = config
94 def create_timetable(self, freq=None):
96 Create service timetable.
99 timetable = {'last': 1466370091.3767564,
105 freq = self.update_every
107 self.timetable = {'last': now,
108 'next': now - (now % freq) + freq,
111 # --- THREAD CONFIGURATION ---
115 Executes self.update(interval) and draws run time chart.
116 Return value presents exit status of update()
119 t_start = float(time.time())
120 chart_name = self.chart_name
122 since_last = int((t_start - self.timetable['last']) * 1000000)
126 if not self.update(since_last):
127 self.error("update function failed.")
130 # draw performance graph
131 run_time = int((time.time() - t_start) * 1000)
132 print("BEGIN netdata.plugin_pythond_%s %s\nSET run_time = %s\nEND\n" %
133 (self.chart_name, str(since_last), str(run_time)))
135 self.debug(chart_name, "updated in", str(run_time), "ms")
136 self.timetable['last'] = t_start
137 self.__first_run = False
142 Runs job in thread. Handles retries.
143 Exits when job failed or timed out.
146 step = float(self.timetable['freq'])
148 self.timetable['last'] = float(time.time() - step)
149 self.debug("starting data collection - update frequency:", str(step), " retries allowed:", str(self.retries))
150 while True: # run forever, unless something is wrong
151 now = float(time.time())
152 next = self.timetable['next'] = now - (now % step) + step + penalty
154 # it is important to do this in a loop
155 # sleep() is interruptable
157 self.debug("sleeping for", str(next - now), "secs to reach frequency of", str(step), "secs, now:", str(now), " next:", str(next), " penalty:", str(penalty))
158 time.sleep(next - now)
159 now = float(time.time())
163 status = self._run_once()
164 except Exception as e:
169 self.retries_left = self.retries
173 self.retries_left -= 1
174 if self.retries_left <= 0:
176 penalty = float(self.retries * step) / 2
183 self.retries_left = self.retries
184 self.alert("failed to collect data for " + str(self.retries) + " times - increasing penalty to " + str(penalty) + " sec and trying again")
187 self.error("failed to collect data - " + str(self.retries_left) + " retries left - penalty: " + str(penalty) + " sec")
194 Escape and convert passed arguments.
195 :param args: anything
199 append = params.append
204 if type(p) is not str:
211 def _line(self, instruction, *params):
213 Converts *params to string and joins them with one space between every one.
214 Result is appended to self._data_stream
215 :param params: str/int/float
217 tmp = list(map((lambda x: "''" if x is None or len(x) == 0 else x), params))
218 self._data_stream += "%s %s\n" % (instruction, str(" ".join(tmp)))
220 def chart(self, type_id, name="", title="", units="", family="",
221 category="", chart_type="line", priority="", update_every=""):
230 :param chart_type: str
231 :param priority: int/str
232 :param update_every: int/str
234 self._charts.append(type_id)
236 p = self._format(type_id, name, title, units, family, category, chart_type, priority, update_every)
237 self._line("CHART", *p)
239 def dimension(self, id, name=None, algorithm="absolute", multiplier=1, divisor=1, hidden=False):
241 Defines a new dimension for the chart
244 :param algorithm: str
245 :param multiplier: int/str
246 :param divisor: int/str
247 :param hidden: boolean
253 self.error("malformed dimension: multiplier is not a number:", multiplier)
258 self.error("malformed dimension: divisor is not a number:", divisor)
262 if algorithm not in ("absolute", "incremental", "percentage-of-absolute-row", "percentage-of-incremental-row"):
263 algorithm = "absolute"
265 self._dimensions.append(str(id))
267 p = self._format(id, name, algorithm, multiplier, divisor, "hidden")
269 p = self._format(id, name, algorithm, multiplier, divisor)
271 self._line("DIMENSION", *p)
273 def begin(self, type_id, microseconds=0):
277 :param microseconds: int
280 if type_id not in self._charts:
281 self.error("wrong chart type_id:", type_id)
286 self.error("malformed begin statement: microseconds are not a number:", microseconds)
289 self._line("BEGIN", type_id, str(microseconds))
292 def set(self, id, value):
294 Set value to dimension
296 :param value: int/float
299 if id not in self._dimensions:
300 self.error("wrong dimension id:", id, "Available dimensions are:", *self._dimensions)
303 value = str(int(value))
305 self.error("cannot set non-numeric value:", str(value))
307 self._line("SET", id, "=", str(value))
308 self.__chart_set = True
314 self.__chart_set = False
316 pos = self._data_stream.rfind("BEGIN")
317 self._data_stream = self._data_stream[:pos]
321 Upload new data to netdata.
323 print(self._data_stream)
324 self._data_stream = ""
326 # --- ERROR HANDLING ---
328 def error(self, *params):
330 Show error message on stderr
332 msg.error(self.chart_name, *params)
334 def alert(self, *params):
336 Show error message on stderr
338 msg.alert(self.chart_name, *params)
340 def debug(self, *params):
342 Show debug message on stderr
344 msg.debug(self.chart_name, *params)
346 def info(self, *params):
348 Show information message on stderr
350 msg.info(self.chart_name, *params)
352 # --- MAIN METHODS ---
366 self.debug("Module", str(self.__module__), "doesn't implement check() function. Using default.")
367 data = self._get_data()
370 self.debug("failed to receive data during check().")
374 self.debug("empty data during check().")
377 self.debug("successfully received data during check(): '" + str(data) + "'")
385 data = self._get_data()
387 self.debug("failed to receive data during create().")
391 for name in self.order:
392 options = self.definitions[name]['options'] + [self.priority + idx, self.update_every]
393 self.chart(self.chart_name + "." + name, *options)
394 # check if server has this datapoint
395 for line in self.definitions[name]['lines']:
397 self.dimension(*line)
403 def update(self, interval):
409 data = self._get_data()
411 self.debug("failed to receive data during update().")
415 for chart in self.order:
416 if self.begin(self.chart_name + "." + chart, interval):
418 for dim in self.definitions[chart]['lines']:
420 self.set(dim[0], data[dim[0]])
427 self.error("no charts to update")
432 class UrlService(SimpleService):
433 # TODO add support for https connections
434 def __init__(self, configuration=None, name=None):
439 SimpleService.__init__(self, configuration=configuration, name=name)
441 def __add_openers(self):
442 # TODO add error handling
443 self.opener = urllib2.build_opener()
446 # TODO currently self.proxies isn't parsed from configuration file
447 # if len(self.proxies) > 0:
448 # for proxy in self.proxies:
451 # if "user" in proxy and "pass" in proxy:
452 # if url.lower().startswith('https://'):
453 # url = 'https://' + proxy['user'] + ':' + proxy['pass'] + '@' + url[8:]
455 # url = 'http://' + proxy['user'] + ':' + proxy['pass'] + '@' + url[7:]
456 # # FIXME move proxy auth to sth like this:
457 # # passman = urllib2.HTTPPasswordMgrWithDefaultRealm()
458 # # passman.add_password(None, url, proxy['user'], proxy['password'])
459 # # opener.add_handler(urllib2.HTTPBasicAuthHandler(passman))
461 # if url.lower().startswith('https://'):
462 # opener.add_handler(urllib2.ProxyHandler({'https': url}))
464 # opener.add_handler(urllib2.ProxyHandler({'https': url}))
467 if self.user is not None and self.password is not None:
468 passman = urllib2.HTTPPasswordMgrWithDefaultRealm()
469 passman.add_password(None, self.url, self.user, self.password)
470 self.opener.add_handler(urllib2.HTTPBasicAuthHandler(passman))
471 self.debug("Enabling HTTP basic auth")
473 #urllib2.install_opener(opener)
475 def _get_raw_data(self):
477 Get raw data from http request
482 f = self.opener.open(self.url, timeout=self.update_every * 2)
483 # f = urllib2.urlopen(self.url, timeout=self.update_every * 2)
484 except Exception as e:
489 raw = f.read().decode('utf-8', 'ignore')
490 except Exception as e:
498 Format configuration data and try to connect to server
501 if self.name is None or self.name == str(None):
503 self.chart_name += "_" + self.name
505 self.name = str(self.name)
507 self.url = str(self.configuration['url'])
508 except (KeyError, TypeError):
511 self.user = str(self.configuration['user'])
512 except (KeyError, TypeError):
515 self.password = str(self.configuration['pass'])
516 except (KeyError, TypeError):
521 test = self._get_data()
522 if test is None or len(test) == 0:
528 class SocketService(SimpleService):
529 def __init__(self, configuration=None, name=None):
531 self._keep_alive = False
532 self.host = "localhost"
534 self.unix_socket = None
536 self.__socket_config = None
537 self.__empty_request = "".encode()
538 SimpleService.__init__(self, configuration=configuration, name=name)
540 def _socketerror(self, message=None):
541 if self.unix_socket is not None:
542 self.error("unix socket '" + self.unix_socket + "':", message)
544 if self.__socket_config is not None:
545 af, socktype, proto, canonname, sa = self.__socket_config
546 self.error("socket to '" + str(sa[0]) + "' port " + str(sa[1]) + ":", message)
548 self.error("unknown socket:", message)
550 def _connect2socket(self, res=None):
552 Connect to a socket, passing the result of getaddrinfo()
556 res = self.__socket_config
558 self.error("Cannot create socket to 'None':")
561 af, socktype, proto, canonname, sa = res
563 self.debug("creating socket to '" + str(sa[0]) + "', port " + str(sa[1]))
564 self._sock = socket.socket(af, socktype, proto)
565 except socket.error as e:
566 self.error("Failed to create socket to '" + str(sa[0]) + "', port " + str(sa[1]) + ":", str(e))
568 self.__socket_config = None
572 self.debug("connecting socket to '" + str(sa[0]) + "', port " + str(sa[1]))
573 self._sock.connect(sa)
574 except socket.error as e:
575 self.error("Failed to connect to '" + str(sa[0]) + "', port " + str(sa[1]) + ":", str(e))
577 self.__socket_config = None
580 self.debug("connected to '" + str(sa[0]) + "', port " + str(sa[1]))
581 self.__socket_config = res
584 def _connect2unixsocket(self):
586 Connect to a unix socket, given its filename
589 if self.unix_socket is None:
590 self.error("cannot connect to unix socket 'None'")
594 self.debug("attempting DGRAM unix socket '" + str(self.unix_socket) + "'")
595 self._sock = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
596 self._sock.connect(self.unix_socket)
597 self.debug("connected DGRAM unix socket '" + str(self.unix_socket) + "'")
599 except socket.error as e:
600 self.debug("Failed to connect DGRAM unix socket '" + str(self.unix_socket) + "':", str(e))
603 self.debug("attempting STREAM unix socket '" + str(self.unix_socket) + "'")
604 self._sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
605 self._sock.connect(self.unix_socket)
606 self.debug("connected STREAM unix socket '" + str(self.unix_socket) + "'")
608 except socket.error as e:
609 self.debug("Failed to connect STREAM unix socket '" + str(self.unix_socket) + "':", str(e))
610 self.error("Failed to connect to unix socket '" + str(self.unix_socket) + "':", str(e))
616 Recreate socket and connect to it since sockets cannot be reused after closing
617 Available configurations are IPv6, IPv4 or UNIX socket
621 if self.unix_socket is not None:
622 self._connect2unixsocket()
625 if self.__socket_config is not None:
626 self._connect2socket()
628 for res in socket.getaddrinfo(self.host, self.port, socket.AF_UNSPEC, socket.SOCK_STREAM):
629 if self._connect2socket(res): break
631 except Exception as e:
633 self.__socket_config = None
635 if self._sock is not None:
636 self._sock.setblocking(0)
637 self._sock.settimeout(5)
638 self.debug("set socket timeout to: " + str(self._sock.gettimeout()))
640 def _disconnect(self):
642 Close socket connection
645 if self._sock is not None:
647 self.debug("closing socket")
648 self._sock.shutdown(2) # 0 - read, 1 - write, 2 - all
659 # Send request if it is needed
660 if self.request != self.__empty_request:
662 self.debug("sending request:", str(self.request))
663 self._sock.send(self.request)
664 except Exception as e:
665 self._socketerror("error sending request:" + str(e))
672 Receive data from socket
677 self.debug("receiving response")
679 buf = self._sock.recv(4096)
680 except Exception as e:
681 self._socketerror("failed to receive response:" + str(e))
685 if buf is None or len(buf) == 0: # handle server disconnect
687 self._socketerror("unexpectedly disconnected")
689 self.debug("server closed the connection")
693 self.debug("received data:", str(buf))
694 data += buf.decode('utf-8', 'ignore')
695 if self._check_raw_data(data):
698 self.debug("final response:", str(data))
701 def _get_raw_data(self):
703 Get raw data with low-level "socket" module.
706 if self._sock is None:
708 if self._sock is None:
711 # Send request if it is needed
715 data = self._receive()
717 if not self._keep_alive:
722 def _check_raw_data(self, data):
724 Check if all data has been gathered from socket
730 def _parse_config(self):
732 Parse configuration data
735 if self.name is None or self.name == str(None):
738 self.name = str(self.name)
741 self.unix_socket = str(self.configuration['socket'])
742 except (KeyError, TypeError):
743 self.debug("No unix socket specified. Trying TCP/IP socket.")
744 self.unix_socket = None
746 self.host = str(self.configuration['host'])
747 except (KeyError, TypeError):
748 self.debug("No host specified. Using: '" + self.host + "'")
750 self.port = int(self.configuration['port'])
751 except (KeyError, TypeError):
752 self.debug("No port specified. Using: '" + str(self.port) + "'")
755 self.request = str(self.configuration['request'])
756 except (KeyError, TypeError):
757 self.debug("No request specified. Using: '" + str(self.request) + "'")
759 self.request = self.request.encode()
763 return SimpleService.check(self)
766 class LogService(SimpleService):
767 def __init__(self, configuration=None, name=None):
769 self._last_position = 0
770 # self._log_reader = None
771 SimpleService.__init__(self, configuration=configuration, name=name)
772 self.retries = 100000 # basically always retry
774 def _get_raw_data(self):
776 Get log lines since last poll
781 if os.path.getsize(self.log_path) < self._last_position:
782 self._last_position = 0 # read from beginning if file has shrunk
783 elif os.path.getsize(self.log_path) == self._last_position:
784 self.debug("Log file hasn't changed. No new data.")
785 return [] # return empty list if nothing has changed
786 with open(self.log_path, "r") as fp:
787 fp.seek(self._last_position)
788 for i, line in enumerate(fp):
790 self._last_position = fp.tell()
791 except Exception as e:
797 self.error("No data collected.")
802 Parse basic configuration and check if log file exists
805 if self.name is not None or self.name != str(None):
808 self.name = str(self.name)
810 self.log_path = str(self.configuration['path'])
811 except (KeyError, TypeError):
812 self.info("No path to log specified. Using: '" + self.log_path + "'")
814 if os.access(self.log_path, os.R_OK):
817 self.error("Cannot access file: '" + self.log_path + "'")
821 # set cursor at last byte of log file
822 self._last_position = os.path.getsize(self.log_path)
823 status = SimpleService.create(self)
824 # self._last_position = 0
828 class ExecutableService(SimpleService):
829 bad_substrings = ('&', '|', ';', '>', '<')
831 def __init__(self, configuration=None, name=None):
833 SimpleService.__init__(self, configuration=configuration, name=name)
835 def _get_raw_data(self):
837 Get raw data from executed command
841 p = Popen(self.command, stdout=PIPE, stderr=PIPE)
842 except Exception as e:
843 self.error("Executing command", self.command, "resulted in error:", str(e))
846 for line in p.stdout.readlines():
847 data.append(str(line.decode()))
850 self.error("No data collected.")
857 Parse basic configuration, check if command is whitelisted and is returning values
860 if self.name is not None or self.name != str(None):
863 self.name = str(self.name)
865 self.command = str(self.configuration['command'])
866 except (KeyError, TypeError):
867 self.info("No command specified. Using: '" + self.command + "'")
868 command = self.command.split(' ')
870 for arg in command[1:]:
871 if any(st in arg for st in self.bad_substrings):
872 self.error("Bad command argument:" + " ".join(self.command[1:]))
875 # test command and search for it in /usr/sbin or /sbin when failed
876 base = command[0].split('/')[-1]
877 if self._get_raw_data() is None:
878 for prefix in ['/sbin/', '/usr/sbin/']:
879 command[0] = prefix + base
880 if os.path.isfile(command[0]):
883 self.command = command
884 if self._get_data() is None or len(self._get_data()) == 0:
885 self.error("Command", self.command, "returned no data")