154 lines
6.3 KiB
Python
Executable File
154 lines
6.3 KiB
Python
Executable File
#!/usr/bin/python3
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# -*- mode: python-mode; py-indent-tabs-mode: nil -*-
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"""
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/*
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* Copyright (C) 2018 sysmocom s.f.m.c. GmbH
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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"""
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__version__ = "0.1.1" # bump this on every non-trivial change
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import argparse, os, logging, logging.handlers, datetime
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import hashlib
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import json
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import configparser
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from functools import partial
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from distutils.version import StrictVersion as V
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from twisted.internet import defer, reactor
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from treq import post, collect
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from osmopy.trap_helper import debug_init, get_type, get_r, p_h, gen_hash, make_params, comm_proc
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from osmopy.twisted_ipa import CTRL, IPAFactory, __version__ as twisted_ipa_version
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from osmopy.osmo_ipa import Ctrl
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# we don't support older versions of TwistedIPA module
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assert V(twisted_ipa_version) > V('0.4')
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def log_duration(log, bid, ts, ts_http):
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"""
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Log human-readable duration from timestamps
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"""
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base = datetime.datetime.now()
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delta_t = datetime.timedelta(seconds = (base - ts).total_seconds())
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delta_h = datetime.timedelta(seconds = (base - ts_http).total_seconds())
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delta_w = delta_t - delta_h
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log.debug('Request for BSC %s took %s total (%s wait, %s http)' % (bid, delta_t, delta_w, delta_h))
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def handle_reply(ts, ts_http, bid, f, log, resp):
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"""
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Reply handler: process raw CGI server response, function f to run for each command
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"""
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decoded = json.loads(resp.decode('utf-8'))
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log_duration(log, bid, ts, ts_http)
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comm_proc(decoded.get('commands'), bid, f, log)
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def make_async_req(ts, dst, par, f_write, f_log, tout):
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"""
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Assemble deferred request parameters and partially instantiate response handler
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"""
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d = post(dst, par, timeout=tout)
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d.addCallback(collect, partial(handle_reply, ts, datetime.datetime.now(), par['bsc_id'], f_write, f_log))
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d.addErrback(lambda e: f_log.critical("HTTP POST error %s while trying to register BSC %s on %s (timeout %d)" % (repr(e), par['bsc_id'], dst, tout))) # handle HTTP errors
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return d
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class Trap(CTRL):
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"""
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TRAP handler (agnostic to factory's client object)
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"""
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def ctrl_TRAP(self, data, op_id, v):
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"""
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Parse CTRL TRAP and dispatch to appropriate handler after normalization
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"""
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if get_type(v) == 'location-state':
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p = p_h(v)
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self.handle_locationstate(p(1), p(3), p(5), p(7), get_r(v))
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else:
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self.factory.log.debug('Ignoring TRAP %s' % (v.split()[0]))
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def ctrl_SET_REPLY(self, data, _, v):
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"""
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Debug log for replies to our commands
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"""
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self.factory.log.debug('SET REPLY %s' % v)
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def ctrl_ERROR(self, data, op_id, v):
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"""
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We want to know if smth went wrong
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"""
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self.factory.log.debug('CTRL ERROR [%s] %s' % (op_id, v))
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def connectionMade(self):
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"""
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Logging wrapper, calling super() is necessary not to break reconnection logic
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"""
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self.factory.log.info("Connected to CTRL@%s:%d" % (self.factory.addr_ctrl, self.factory.port_ctrl))
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super(CTRL, self).connectionMade()
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def handle_locationstate(self, net, bsc, bts, trx, data):
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"""
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Handle location-state TRAP: parse trap content, build CGI Request and use treq's routines to post it while setting up async handlers
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"""
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params = make_params(bsc, data)
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self.factory.log.info('location-state@%s.%s.%s.%s (%s) => %s' % (net, bsc, bts, trx, params['time_stamp'], data))
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params['h'] = gen_hash(params, self.factory.secret_key)
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t = datetime.datetime.now()
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self.factory.log.debug('Preparing request for BSC %s @ %s...' % (params['bsc_id'], t))
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# Ensure that we run only limited number of requests in parallel:
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self.factory.semaphore.run(make_async_req, t, self.factory.location, params, self.transport.write, self.factory.log, self.factory.timeout)
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class TrapFactory(IPAFactory):
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"""
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Store CGI information so TRAP handler can use it for requests
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"""
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def __init__(self, proto, log):
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self.log = log
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level = self.log.getEffectiveLevel()
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self.log.setLevel(logging.WARNING) # we do not need excessive debug from lower levels
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super(TrapFactory, self).__init__(proto, self.log)
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self.log.setLevel(level)
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self.log.debug("Using Osmocom IPA library v%s" % Ctrl.version)
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if __name__ == '__main__':
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p = argparse.ArgumentParser(description='Proxy between given GCI service and Osmocom CTRL protocol.')
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p.add_argument('-v', '--version', action='version', version=("%(prog)s v" + __version__))
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p.add_argument('-d', '--debug', action='store_true', help="Enable debug log") # keep in sync with debug_init call below
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p.add_argument('-c', '--config-file', required=True, help="Path to mandatory config file (in INI format).")
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args = p.parse_args(namespace=TrapFactory)
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log = debug_init('CTRL2CGI', args.debug)
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T = TrapFactory(Trap, log)
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config = configparser.ConfigParser(interpolation=None)
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config.read(args.config_file)
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T.addr_ctrl = config['main'].get('addr_ctrl', 'localhost')
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T.port_ctrl = config['main'].getint('port_ctrl', 4250)
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T.timeout = config['main'].getint('timeout', 30)
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T.semaphore = defer.DeferredSemaphore(config['main'].getint('num_max_conn', 5))
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T.location = config['main'].get('location')
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T.secret_key = config['main'].get('secret_key')
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log.info("CGI proxy v%s starting with PID %d:" % (__version__, os.getpid()))
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log.info("destination %s (concurrency %d)" % (T.location, T.semaphore.limit))
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log.info("connecting to %s:%d..." % (T.addr_ctrl, T.port_ctrl))
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reactor.connectTCP(T.addr_ctrl, T.port_ctrl, T)
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reactor.run()
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