├── .gitignore ├── CHANGELOG ├── COPYING ├── COPYING.LESSER ├── MANIFEST ├── PKG-INFO ├── README.md ├── ntplib.py ├── setup.py └── test_ntplib.py /.gitignore: -------------------------------------------------------------------------------- 1 | *.pyc 2 | -------------------------------------------------------------------------------- /CHANGELOG: -------------------------------------------------------------------------------- 1 | version 0.3.0 - 2 | - add a `timeout` parameter to NTPClient.request() 3 | - rewrite tests using the unittest module, add many tests 4 | - cleanup 5 | 6 | version 0.2.0 - 7 | - cleanup 8 | - raise a NTPException when no response is received from server 9 | 10 | version 0.1.8 - 2010-02-20 11 | - change to LGPL license 12 | - cleanup 13 | 14 | version 0.1.7 - 2009-12-24 15 | - cleanup 16 | - fix delay computation (thanks to Michael Frère for pointing that out) 17 | 18 | version 0.1.6 - 2009-11-01 19 | - cleanup 20 | - when the server doesn't respond within a reasonable interval, let the 21 | application handle socket.timeout 22 | 23 | version 0.1.5 - 2009-07-13 24 | - perform stricter source check upon reception of a response 25 | - small cleanup 26 | 27 | version 0.1.4 - 2009-06-04 28 | - add properties to NTPStats to have timestamps converted to local time 29 | 30 | version 0.1.3 - 2009-05-18 31 | - fix root delay and root dispersion computation 32 | 33 | version 0.1.2 - 2009-05-17 34 | - create request packet after name resolution to avoid name resolution delay 35 | 36 | version 0.1.1 - 2009-05-16 37 | - cleanup to conform to PEP 8 38 | - when the server doesn't respond within a reasonable interval, raise a 39 | NTPException instead of a socket.timeout 40 | - change initial values used to check the source address in NTPClient.request 41 | to (None, None), simpler and cleaner 42 | 43 | version 0.1.0 - 2009-05-14 44 | - initial release 45 | -------------------------------------------------------------------------------- /COPYING: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. 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Since it's pure Python, and only depends on core modules, it 20 | should work on any platform with a Python implementation. 21 | 22 | Example 23 | ------- 24 | 25 | >>> import ntplib 26 | >>> from time import ctime 27 | >>> c = ntplib.NTPClient() 28 | >>> response = c.request('europe.pool.ntp.org', version=3) 29 | >>> response.offset 30 | -0.143156766891 31 | >>> response.version 32 | 3 33 | >>> ctime(response.tx_time) 34 | 'Sun May 17 09:32:48 2009' 35 | >>> ntplib.leap_to_text(response.leap) 36 | 'no warning' 37 | >>> response.root_delay 38 | 0.0046844482421875 39 | >>> ntplib.ref_id_to_text(response.ref_id) 40 | 193.190.230.66 41 | 42 | 43 | Installation 44 | ------------ 45 | 46 | As root:: 47 | 48 | # python setup.py install 49 | 50 | or just copy ntplib.py inside a directory in your sys.path, e.g. 51 | `/usr/lib/python2.5/`. 52 | 53 | Platform: UNKNOWN 54 | Classifier: License :: OSI Approved :: GNU Library or Lesser General Public License (LGPL) 55 | Classifier: Programming Language :: Python 56 | Classifier: Operating System :: OS Independent 57 | Classifier: Topic :: System :: Networking :: Time Synchronization 58 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ntplib - Python NTP library 2 | =========================== 3 | 4 | Description 5 | ----------- 6 | 7 | This module offers a simple interface to query NTP servers from Python. 8 | 9 | It also provides utility functions to translate NTP fields values to text (mode, 10 | leap indicator...). Since it's pure Python, and only depends on core modules, it 11 | should work on any platform with a Python implementation. 12 | 13 | Example 14 | ------- 15 | 16 | ```python 17 | >>> import ntplib 18 | >>> from time import ctime 19 | >>> c = ntplib.NTPClient() 20 | >>> response = c.request('europe.pool.ntp.org', version=3) 21 | >>> response.offset 22 | -0.143156766891 23 | >>> response.version 24 | 3 25 | >>> ctime(response.tx_time) 26 | 'Sun May 17 09:32:48 2009' 27 | >>> ntplib.leap_to_text(response.leap) 28 | 'no warning' 29 | >>> response.root_delay 30 | 0.0046844482421875 31 | >>> ntplib.ref_id_to_text(response.ref_id) 32 | 193.190.230.66 33 | ``` 34 | 35 | 36 | Installation 37 | ------------ 38 | 39 | As root: 40 | 41 | ``` 42 | # python setup.py install 43 | ``` 44 | 45 | or just copy ntplib.py inside a directory in your sys.path, e.g. 46 | `/usr/lib/python2.5/`. 47 | -------------------------------------------------------------------------------- /ntplib.py: -------------------------------------------------------------------------------- 1 | ############################################################################### 2 | # ntplib - Python NTP library. 3 | # Copyright (C) 2009 Charles-Francois Natali 4 | # 5 | # ntplib is free software; you can redistribute it and/or modify it under the 6 | # terms of the GNU Lesser General Public License as published by the Free 7 | # Software Foundation; either version 2 of the License, or (at your option) any 8 | # later version. 9 | # 10 | # This program is distributed in the hope that it will be useful, but WITHOUT 11 | # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 12 | # FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more 13 | # details. 14 | # 15 | # You should have received a copy of the GNU Lesser General Public License along 16 | # with this program; if not, write to the Free Software Foundation, Inc., 59 17 | # Temple Place, Suite 330, Boston, MA 0.1.2-1307 USA 18 | ############################################################################### 19 | """Python NTP library. 20 | 21 | Implementation of client-side NTP (RFC-1305), and useful NTP-related 22 | functions. 23 | """ 24 | 25 | 26 | import datetime 27 | import socket 28 | import struct 29 | import time 30 | 31 | 32 | class NTPException(Exception): 33 | """Exception raised by this module.""" 34 | pass 35 | 36 | 37 | class NTP: 38 | """Helper class defining constants.""" 39 | 40 | _SYSTEM_EPOCH = datetime.date(*time.gmtime(0)[0:3]) 41 | """system epoch""" 42 | _NTP_EPOCH = datetime.date(1900, 1, 1) 43 | """NTP epoch""" 44 | NTP_DELTA = (_SYSTEM_EPOCH - _NTP_EPOCH).days * 24 * 3600 45 | """delta between system and NTP time""" 46 | 47 | REF_ID_TABLE = { 48 | 'DNC': "DNC routing protocol", 49 | 'NIST': "NIST public modem", 50 | 'TSP': "TSP time protocol", 51 | 'DTS': "Digital Time Service", 52 | 'ATOM': "Atomic clock (calibrated)", 53 | 'VLF': "VLF radio (OMEGA, etc)", 54 | 'callsign': "Generic radio", 55 | 'LORC': "LORAN-C radionavidation", 56 | 'GOES': "GOES UHF environment satellite", 57 | 'GPS': "GPS UHF satellite positioning", 58 | } 59 | """reference identifier table""" 60 | 61 | STRATUM_TABLE = { 62 | 0: "unspecified", 63 | 1: "primary reference", 64 | } 65 | """stratum table""" 66 | 67 | MODE_TABLE = { 68 | 0: "unspecified", 69 | 1: "symmetric active", 70 | 2: "symmetric passive", 71 | 3: "client", 72 | 4: "server", 73 | 5: "broadcast", 74 | 6: "reserved for NTP control messages", 75 | 7: "reserved for private use", 76 | } 77 | """mode table""" 78 | 79 | LEAP_TABLE = { 80 | 0: "no warning", 81 | 1: "last minute has 61 seconds", 82 | 2: "last minute has 59 seconds", 83 | 3: "alarm condition (clock not synchronized)", 84 | } 85 | """leap indicator table""" 86 | 87 | 88 | class NTPPacket: 89 | """NTP packet class. 90 | 91 | This represents an NTP packet. 92 | """ 93 | 94 | _PACKET_FORMAT = "!B B B b 11I" 95 | """packet format to pack/unpack""" 96 | 97 | def __init__(self, version=2, mode=3, tx_timestamp=0): 98 | """Constructor. 99 | 100 | Parameters: 101 | version -- NTP version 102 | mode -- packet mode (client, server) 103 | tx_timestamp -- packet transmit timestamp 104 | """ 105 | self.leap = 0 106 | """leap second indicator""" 107 | self.version = version 108 | """version""" 109 | self.mode = mode 110 | """mode""" 111 | self.stratum = 0 112 | """stratum""" 113 | self.poll = 0 114 | """poll interval""" 115 | self.precision = 0 116 | """precision""" 117 | self.root_delay = 0 118 | """root delay""" 119 | self.root_dispersion = 0 120 | """root dispersion""" 121 | self.ref_id = 0 122 | """reference clock identifier""" 123 | self.ref_timestamp = 0 124 | """reference timestamp""" 125 | self.orig_timestamp = 0 126 | """originate timestamp""" 127 | self.recv_timestamp = 0 128 | """receive timestamp""" 129 | self.tx_timestamp = tx_timestamp 130 | """tansmit timestamp""" 131 | 132 | def to_data(self): 133 | """Convert this NTPPacket to a buffer that can be sent over a socket. 134 | 135 | Returns: 136 | buffer representing this packet 137 | 138 | Raises: 139 | NTPException -- in case of invalid field 140 | """ 141 | try: 142 | packed = struct.pack(NTPPacket._PACKET_FORMAT, 143 | (self.leap << 6 | self.version << 3 | self.mode), 144 | self.stratum, 145 | self.poll, 146 | self.precision, 147 | _to_int(self.root_delay) << 16 | _to_frac(self.root_delay, 16), 148 | _to_int(self.root_dispersion) << 16 | 149 | _to_frac(self.root_dispersion, 16), 150 | self.ref_id, 151 | _to_int(self.ref_timestamp), 152 | _to_frac(self.ref_timestamp), 153 | _to_int(self.orig_timestamp), 154 | _to_frac(self.orig_timestamp), 155 | _to_int(self.recv_timestamp), 156 | _to_frac(self.recv_timestamp), 157 | _to_int(self.tx_timestamp), 158 | _to_frac(self.tx_timestamp)) 159 | except struct.error: 160 | raise NTPException("Invalid NTP packet fields.") 161 | return packed 162 | 163 | def from_data(self, data): 164 | """Populate this instance from a NTP packet payload received from 165 | the network. 166 | 167 | Parameters: 168 | data -- buffer payload 169 | 170 | Raises: 171 | NTPException -- in case of invalid packet format 172 | """ 173 | try: 174 | unpacked = struct.unpack(NTPPacket._PACKET_FORMAT, 175 | data[0:struct.calcsize(NTPPacket._PACKET_FORMAT)]) 176 | except struct.error: 177 | raise NTPException("Invalid NTP packet.") 178 | 179 | self.leap = unpacked[0] >> 6 & 0x3 180 | self.version = unpacked[0] >> 3 & 0x7 181 | self.mode = unpacked[0] & 0x7 182 | self.stratum = unpacked[1] 183 | self.poll = unpacked[2] 184 | self.precision = unpacked[3] 185 | self.root_delay = float(unpacked[4])/2**16 186 | self.root_dispersion = float(unpacked[5])/2**16 187 | self.ref_id = unpacked[6] 188 | self.ref_timestamp = _to_time(unpacked[7], unpacked[8]) 189 | self.orig_timestamp = _to_time(unpacked[9], unpacked[10]) 190 | self.recv_timestamp = _to_time(unpacked[11], unpacked[12]) 191 | self.tx_timestamp = _to_time(unpacked[13], unpacked[14]) 192 | 193 | 194 | class NTPStats(NTPPacket): 195 | """NTP statistics. 196 | 197 | Wrapper for NTPPacket, offering additional statistics like offset and delay, 198 | and timestamps converted to system time. 199 | """ 200 | 201 | def __init__(self): 202 | """Constructor.""" 203 | NTPPacket.__init__(self) 204 | self.dest_timestamp = 0 205 | """destination timestamp""" 206 | 207 | @property 208 | def offset(self): 209 | """offset""" 210 | return ((self.recv_timestamp - self.orig_timestamp) + 211 | (self.tx_timestamp - self.dest_timestamp))/2 212 | 213 | @property 214 | def delay(self): 215 | """round-trip delay""" 216 | return ((self.dest_timestamp - self.orig_timestamp) - 217 | (self.tx_timestamp - self.recv_timestamp)) 218 | 219 | @property 220 | def tx_time(self): 221 | """Transmit timestamp in system time.""" 222 | return ntp_to_system_time(self.tx_timestamp) 223 | 224 | @property 225 | def recv_time(self): 226 | """Receive timestamp in system time.""" 227 | return ntp_to_system_time(self.recv_timestamp) 228 | 229 | @property 230 | def orig_time(self): 231 | """Originate timestamp in system time.""" 232 | return ntp_to_system_time(self.orig_timestamp) 233 | 234 | @property 235 | def ref_time(self): 236 | """Reference timestamp in system time.""" 237 | return ntp_to_system_time(self.ref_timestamp) 238 | 239 | @property 240 | def dest_time(self): 241 | """Destination timestamp in system time.""" 242 | return ntp_to_system_time(self.dest_timestamp) 243 | 244 | 245 | class NTPClient: 246 | """NTP client session.""" 247 | 248 | def __init__(self): 249 | """Constructor.""" 250 | pass 251 | 252 | def request(self, host, version=2, port='ntp', timeout=5): 253 | """Query a NTP server. 254 | 255 | Parameters: 256 | host -- server name/address 257 | version -- NTP version to use 258 | port -- server port 259 | timeout -- timeout on socket operations 260 | 261 | Returns: 262 | NTPStats object 263 | """ 264 | # lookup server address 265 | addrinfo = socket.getaddrinfo(host, port)[0] 266 | family, sockaddr = addrinfo[0], addrinfo[4] 267 | 268 | # create the socket 269 | s = socket.socket(family, socket.SOCK_DGRAM) 270 | 271 | try: 272 | s.settimeout(timeout) 273 | 274 | # create the request packet - mode 3 is client 275 | query_packet = NTPPacket(mode=3, version=version, 276 | tx_timestamp=system_to_ntp_time(time.time())) 277 | 278 | # send the request 279 | s.sendto(query_packet.to_data(), sockaddr) 280 | 281 | # wait for the response - check the source address 282 | src_addr = None, 283 | while src_addr[0] != sockaddr[0]: 284 | response_packet, src_addr = s.recvfrom(256) 285 | 286 | # build the destination timestamp 287 | dest_timestamp = system_to_ntp_time(time.time()) 288 | except socket.timeout: 289 | raise NTPException("No response received from %s." % host) 290 | finally: 291 | s.close() 292 | 293 | # construct corresponding statistics 294 | stats = NTPStats() 295 | stats.from_data(response_packet) 296 | stats.dest_timestamp = dest_timestamp 297 | 298 | return stats 299 | 300 | 301 | def _to_int(timestamp): 302 | """Return the integral part of a timestamp. 303 | 304 | Parameters: 305 | timestamp -- NTP timestamp 306 | 307 | Retuns: 308 | integral part 309 | """ 310 | return int(timestamp) 311 | 312 | def _to_frac(timestamp, n=32): 313 | """Return the fractional part of a timestamp. 314 | 315 | Parameters: 316 | timestamp -- NTP timestamp 317 | n -- number of bits of the fractional part 318 | 319 | Retuns: 320 | fractional part 321 | """ 322 | return int(abs(timestamp - _to_int(timestamp)) * 2**n) 323 | 324 | def _to_time(integ, frac, n=32): 325 | """Return a timestamp from an integral and fractional part. 326 | 327 | Parameters: 328 | integ -- integral part 329 | frac -- fractional part 330 | n -- number of bits of the fractional part 331 | 332 | Retuns: 333 | timestamp 334 | """ 335 | return integ + float(frac)/2**n 336 | 337 | def ntp_to_system_time(timestamp): 338 | """Convert a NTP time to system time. 339 | 340 | Parameters: 341 | timestamp -- timestamp in NTP time 342 | 343 | Returns: 344 | corresponding system time 345 | """ 346 | return timestamp - NTP.NTP_DELTA 347 | 348 | def system_to_ntp_time(timestamp): 349 | """Convert a system time to a NTP time. 350 | 351 | Parameters: 352 | timestamp -- timestamp in system time 353 | 354 | Returns: 355 | corresponding NTP time 356 | """ 357 | return timestamp + NTP.NTP_DELTA 358 | 359 | def leap_to_text(leap): 360 | """Convert a leap indicator to text. 361 | 362 | Parameters: 363 | leap -- leap indicator value 364 | 365 | Returns: 366 | corresponding message 367 | 368 | Raises: 369 | NTPException -- in case of invalid leap indicator 370 | """ 371 | if leap in NTP.LEAP_TABLE: 372 | return NTP.LEAP_TABLE[leap] 373 | else: 374 | raise NTPException("Invalid leap indicator.") 375 | 376 | def mode_to_text(mode): 377 | """Convert a NTP mode value to text. 378 | 379 | Parameters: 380 | mode -- NTP mode 381 | 382 | Returns: 383 | corresponding message 384 | 385 | Raises: 386 | NTPException -- in case of invalid mode 387 | """ 388 | if mode in NTP.MODE_TABLE: 389 | return NTP.MODE_TABLE[mode] 390 | else: 391 | raise NTPException("Invalid mode.") 392 | 393 | def stratum_to_text(stratum): 394 | """Convert a stratum value to text. 395 | 396 | Parameters: 397 | stratum -- NTP stratum 398 | 399 | Returns: 400 | corresponding message 401 | 402 | Raises: 403 | NTPException -- in case of invalid stratum 404 | """ 405 | if stratum in NTP.STRATUM_TABLE: 406 | return NTP.STRATUM_TABLE[stratum] 407 | elif 1 < stratum < 255: 408 | return "secondary reference (NTP)" 409 | else: 410 | raise NTPException("Invalid stratum.") 411 | 412 | def ref_id_to_text(ref_id, stratum=2): 413 | """Convert a reference clock identifier to text according to its stratum. 414 | 415 | Parameters: 416 | ref_id -- reference clock indentifier 417 | stratum -- NTP stratum 418 | 419 | Returns: 420 | corresponding message 421 | 422 | Raises: 423 | NTPException -- in case of invalid stratum 424 | """ 425 | fields = (ref_id >> 24 & 0xff, ref_id >> 16 & 0xff, 426 | ref_id >> 8 & 0xff, ref_id & 0xff) 427 | 428 | # return the result as a string or dot-formatted IP address 429 | if 0 <= stratum <= 1 : 430 | text = '%c%c%c%c' % fields 431 | if text in NTP.REF_ID_TABLE: 432 | return NTP.REF_ID_TABLE[text] 433 | else: 434 | return text 435 | elif 2 <= stratum < 255: 436 | return '%d.%d.%d.%d' % fields 437 | else: 438 | raise NTPException("Invalid stratum.") 439 | -------------------------------------------------------------------------------- /setup.py: -------------------------------------------------------------------------------- 1 | from distutils.core import setup 2 | 3 | 4 | long_description = """ 5 | ntplib - Python NTP library 6 | =========================== 7 | 8 | Description 9 | ----------- 10 | 11 | This module offers a simple interface to query NTP servers from Python. 12 | 13 | It also provides utility functions to translate NTP fields values to text (mode, 14 | leap indicator...). Since it's pure Python, and only depends on core modules, it 15 | should work on any platform with a Python implementation. 16 | 17 | Example 18 | ------- 19 | 20 | >>> import ntplib 21 | >>> from time import ctime 22 | >>> c = ntplib.NTPClient() 23 | >>> response = c.request('europe.pool.ntp.org', version=3) 24 | >>> response.offset 25 | -0.143156766891 26 | >>> response.version 27 | 3 28 | >>> ctime(response.tx_time) 29 | 'Sun May 17 09:32:48 2009' 30 | >>> ntplib.leap_to_text(response.leap) 31 | 'no warning' 32 | >>> response.root_delay 33 | 0.0046844482421875 34 | >>> ntplib.ref_id_to_text(response.ref_id) 35 | 193.190.230.66 36 | 37 | 38 | Installation 39 | ------------ 40 | 41 | As root:: 42 | 43 | # python setup.py install 44 | 45 | or just copy ntplib.py inside a directory in your sys.path, e.g. 46 | `/usr/lib/python2.5/`. 47 | """ 48 | 49 | 50 | setup(name='ntplib', 51 | version='0.3.0', 52 | description='Python NTP library', 53 | author='Charles-Francois Natali', 54 | author_email='neologix@free.fr', 55 | url='http://pypi.python.org/pypi/ntplib/', 56 | py_modules=['ntplib'], 57 | license='LGPL', 58 | classifiers=[ 59 | 'License :: OSI Approved :: GNU Library or Lesser General Public License (LGPL)', 60 | 'Programming Language :: Python', 61 | 'Operating System :: OS Independent', 62 | 'Topic :: System :: Networking :: Time Synchronization' 63 | ], 64 | long_description=long_description 65 | ) 66 | -------------------------------------------------------------------------------- /test_ntplib.py: -------------------------------------------------------------------------------- 1 | """Python NTP library tests. 2 | """ 3 | 4 | 5 | import socket 6 | import time 7 | import unittest 8 | 9 | import ntplib 10 | 11 | 12 | class TestNTPLib(unittest.TestCase): 13 | 14 | NTP_SERVER = "pool.ntp.org" 15 | """test NTP server""" 16 | 17 | POLL_DELAY = 1 18 | """delay between NTP polls, in seconds""" 19 | 20 | DELTA_TOLERANCE = 0.5 21 | """tolerance for offset/delay comparisons, in seconds""" 22 | 23 | 24 | def test_basic(self): 25 | """Basic tests.""" 26 | self.assertTrue(issubclass(ntplib.NTPException, Exception)) 27 | 28 | client = ntplib.NTPClient() 29 | 30 | def test_request(self): 31 | """Request tests.""" 32 | client = ntplib.NTPClient() 33 | 34 | t1 = time.time() 35 | info = client.request(self.NTP_SERVER) 36 | t2 = time.time() 37 | 38 | # check response 39 | self.assertTrue(isinstance(info, ntplib.NTPStats)) 40 | self.assertTrue(0 < info.version <= 4) 41 | self.assertTrue(isinstance(info.offset, float)) 42 | self.assertTrue(0 <= info.stratum < 0xff) 43 | self.assertTrue(-0x7f <= info.precision < 0x7f) 44 | self.assertTrue(isinstance(info.root_delay, float)) 45 | self.assertTrue(isinstance(info.root_dispersion, float)) 46 | self.assertTrue(isinstance(info.delay, float)) 47 | self.assertTrue(isinstance(info.leap, int)) 48 | self.assertIn(info.leap, ntplib.NTP.LEAP_TABLE) 49 | self.assertTrue(0 <= info.poll < 0xfff) 50 | self.assertTrue(isinstance(info.mode, int)) 51 | self.assertIn(info.mode, ntplib.NTP.MODE_TABLE) 52 | self.assertTrue(0 <= info.ref_id < 0xffffffff) 53 | self.assertTrue(isinstance(info.tx_time, float)) 54 | self.assertTrue(isinstance(info.ref_time, float)) 55 | self.assertTrue(isinstance(info.orig_time, float)) 56 | self.assertTrue(isinstance(info.recv_time, float)) 57 | self.assertTrue(isinstance(info.dest_time, float)) 58 | 59 | time.sleep(self.POLL_DELAY) 60 | 61 | new_info = client.request(self.NTP_SERVER) 62 | 63 | # check timestamps 64 | self.assertTrue(t1 < info.orig_time < info.dest_time < t2) 65 | self.assertTrue(info.orig_time < new_info.orig_time) 66 | self.assertTrue(info.recv_time < new_info.recv_time) 67 | self.assertTrue(info.tx_time < new_info.tx_time) 68 | self.assertTrue(info.dest_time < new_info.dest_time) 69 | 70 | # check the offset and delay 71 | self.assertLess(abs(new_info.offset - info.offset), self.DELTA_TOLERANCE) 72 | self.assertLess(abs(new_info.delay - info.delay), self.DELTA_TOLERANCE) 73 | 74 | # try reaching a non existent server 75 | self.assertRaises(ntplib.NTPException, 76 | client.request, "localhost", port=42) 77 | 78 | # try reaching a non existent server with a custom timeout 79 | t = time.time() 80 | self.assertRaises(ntplib.NTPException, 81 | client.request, "localhost", port=42, timeout=1) 82 | self.assertTrue(0.7 < time.time() - t < 1.3) 83 | 84 | def test_helpers(self): 85 | """Helper methods tests.""" 86 | client = ntplib.NTPClient() 87 | 88 | time.sleep(self.POLL_DELAY) 89 | info = client.request(self.NTP_SERVER) 90 | 91 | self.assertEqual(int(info.tx_time), ntplib.ntp_to_system_time( 92 | ntplib.system_to_ntp_time(int(info.tx_time)))) 93 | 94 | self.assertTrue(isinstance(ntplib.leap_to_text(info.leap), str)) 95 | self.assertTrue(isinstance(ntplib.mode_to_text(info.mode), str)) 96 | self.assertTrue(isinstance(ntplib.stratum_to_text(info.stratum), str)) 97 | self.assertTrue(isinstance(ntplib.ref_id_to_text(info.ref_id, 98 | info.stratum), str)) 99 | 100 | 101 | if __name__ == '__main__': 102 | unittest.main() 103 | --------------------------------------------------------------------------------