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neels gerrit-no-reply at lists.osmocom.orgneels has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-gsm-tester/+/21504 ) Change subject: add osmo_vty.py ...................................................................... add osmo_vty.py To trigger manual handovers, I need a VTY interface. The non-trivial parts of this are copied from osmo-python-tests osmo_interact_vty.py. Will be used in the upcoming handover_2G test suite in I0b2671304165a1aaae2b386af46fbd8b098e3bd8. Change-Id: I7c17b143b7c690b8c4105ee7c6272670046fa91d --- A src/osmo_gsm_tester/obj/osmo_vty.py 1 file changed, 181 insertions(+), 0 deletions(-) git pull ssh://gerrit.osmocom.org:29418/osmo-gsm-tester refs/changes/04/21504/1 diff --git a/src/osmo_gsm_tester/obj/osmo_vty.py b/src/osmo_gsm_tester/obj/osmo_vty.py new file mode 100644 index 0000000..88deb61 --- /dev/null +++ b/src/osmo_gsm_tester/obj/osmo_vty.py @@ -0,0 +1,181 @@ +# osmo_gsm_tester: VTY connection +# +# Copyright (C) 2016-2017 by sysmocom - s.f.m.c. GmbH +# +# Author: Neels Hofmeyr <neels at hofmeyr.de> +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as +# published by the Free Software Foundation, either version 3 of the +# License, or (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <http://www.gnu.org/licenses/>. + +import socket +import struct +import re +import time + +from ..core import log + +class VtyInterfaceExn(Exception): + pass + +class OsmoVty(log.Origin): + + def __init__(self, host, port, prompt=None): + super().__init__(log.C_BUS, 'Vty', host=host, port=port) + self.host = host + self.port = port + self.sck = None + self.prompt = prompt + self.re_prompt = None + self.this_node = None + self.this_prompt_char = None + self.last_node = None + self.last_prompt_char = None + + def connect(self): + attempts = 10; + while True: + try: + self.dbg('Connecting') + self.sck = socket.socket(socket.AF_INET, socket.SOCK_STREAM) + self.sck.connect((self.host, self.port)) + except ConnectionRefusedError: + attempts -= 1 + if attempts < 1: + raise + self.dbg('Connection Refused, trying again (attempts left: %d)' % attempts) + time.sleep(3) + continue + break + + self.sck.setblocking(1) + + # read first prompt + # (copied from https://git.osmocom.org/python/osmo-python-tests/tree/osmopy/osmo_interact/vty.py) + self.this_node = None + self.this_prompt_char = '>' # slight cheat for initial prompt char + self.last_node = None + self.last_prompt_char = None + + data = self.sck.recv(4096) + if not self.prompt: + b = data + b = b[b.rfind(b'\n') + 1:] + while b and (b[0] < ord('A') or b[0] > ord('z')): + b = b[1:] + prompt_str = b.decode('utf-8') + if '>' in prompt_str: + self.prompt = prompt_str[:prompt_str.find('>')] + self.dbg(prompt=self.prompt) + if not self.prompt: + raise VtyInterfaceExn('Could not find application name; needed to decode prompts.' + ' Initial data was: %r' % data) + self.re_prompt = re.compile('^%s(?:\(([\w-]*)\))?([#>]) (.*)$' % self.prompt) + + def disconnect(self): + self.dbg('Disconnecting') + if self.sck is not None: + self.sck.close() + + def _command(self, command_str, timeout=10, strict=True): + # (copied from https://git.osmocom.org/python/osmo-python-tests/tree/osmopy/osmo_interact/vty.py) + self.dbg('Sending', command_str=command_str) + self.sck.send(command_str.encode()) + + waited_since = time.time() + received_lines = [] + last_line = '' + + while True: + new_data = self.sck.recv(4096).decode('utf-8') + + last_line = "%s%s" % (last_line, new_data) + + if last_line: + # Separate the received response into lines. + # But note: the VTY logging currently separates with '\n\r', not '\r\n', + # see _vty_output() in libosmocore logging_vty.c. + # So we need to jump through hoops to not separate 'abc\n\rdef' as + # [ 'abc', '', 'def' ]; but also not to convert '\r\n\r\n' to '\r\n\n' ('\r{\r\n}\n') + # Simplest is to just drop all the '\r' and only care about the '\n'. + last_line = last_line.replace('\r', '') + lines = last_line.splitlines() + if last_line.endswith('\n'): + received_lines.extend(lines) + last_line = "" + else: + # if pkt buffer ends in the middle of a line, we need to keep + # last non-finished line: + received_lines.extend(lines[:-1]) + last_line = lines[-1] + + match = self.re_prompt.match(last_line) + if not match: + if time.time() - waited_since > timeout: + raise IOError("Failed to read data (did the app crash?)") + time.sleep(.1) + continue + + self.last_node = self.this_node + self.last_prompt_char = self.this_prompt_char + self.this_node = match.group(1) or None + self.this_prompt_char = match.group(2) + break + + # expecting to have received the command we sent as echo, remove it + clean_command_str = command_str.strip() + if clean_command_str.endswith('?'): + clean_command_str = clean_command_str[:-1] + if received_lines and received_lines[0] == clean_command_str: + received_lines = received_lines[1:] + if len(received_lines) > 1: + self.dbg('Received\n|', '\n| '.join(received_lines), '\n') + elif len(received_lines) == 1: + self.dbg('Received', repr(received_lines[0])) + + if received_lines == ['% Unknown command.']: + errmsg = 'VTY reports unknown command: %r' % command_str + if strict: + raise VtyInterfaceExn(errmsg) + else: + self.log('ignoring error:', errmsg) + + return received_lines + + def cmd(self, command_str, timeout=10, strict=True): + # (copied from https://git.osmocom.org/python/osmo-python-tests/tree/osmopy/osmo_interact/vty.py) + command_str = command_str or '\r' + if command_str[-1] not in '?\r\t': + command_str = command_str + '\r' + + received_lines = self._command(command_str, timeout, strict) + + # send escape to cancel the '?' command line + if command_str[-1] == '?': + self._command('\x03', timeout) + + return received_lines + + def cmds(self, *cmds, timeout=10, strict=True): + responses = [] + for cmd in cmds: + responses.append(self.cmd(cmd, timeout, strict)) + return responses + + def __enter__(self): + self.connect() + return self + + def __exit__(self, *exc_info): + self.disconnect() + +# vim: expandtab tabstop=4 shiftwidth=4 -- To view, visit https://gerrit.osmocom.org/c/osmo-gsm-tester/+/21504 To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmo-gsm-tester Gerrit-Branch: master Gerrit-Change-Id: I7c17b143b7c690b8c4105ee7c6272670046fa91d Gerrit-Change-Number: 21504 Gerrit-PatchSet: 1 Gerrit-Owner: neels <nhofmeyr at sysmocom.de> Gerrit-MessageType: newchange -------------- next part -------------- An HTML attachment was scrubbed... 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