initial checkin
This commit is contained in:
Pim van Pelt
268
pyagentx/network.py
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268
pyagentx/network.py
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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from __future__ import (
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absolute_import,
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division,
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print_function,
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)
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# --------------------------------------------
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import logging
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class NullHandler(logging.Handler):
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def emit(self, record):
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pass
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logger = logging.getLogger('pyagentx.network')
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logger.addHandler(NullHandler())
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# --------------------------------------------
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import socket
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import time
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import threading
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try:
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import queue
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except ImportError:
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import Queue as queue
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import pyagentx
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from pyagentx.pdu import PDU
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class Network(threading.Thread):
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def __init__(self, update_queue, oid_list, sethandlers):
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threading.Thread.__init__(self)
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self.stop = threading.Event()
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self._queue = update_queue
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self._oid_list = oid_list
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self._sethandlers = sethandlers
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self.session_id = 0
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self.transaction_id = 0
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self.debug = 1
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# Data Related Variables
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self.data = {}
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self.data_idx = []
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def _connect(self):
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while True:
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try:
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# self.socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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# self.socket.connect(pyagentx.SOCKET_PATH)
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self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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self.socket.connect(("localhost",705))
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self.socket.settimeout(0.1)
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return
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except socket.error:
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logger.error("Failed to connect, sleeping and retrying later")
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time.sleep(2)
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def new_pdu(self, type):
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pdu = PDU(type)
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pdu.session_id = self.session_id
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pdu.transaction_id = self.transaction_id
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self.transaction_id += 1
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return pdu
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def response_pdu(self, org_pdu):
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pdu = PDU(pyagentx.AGENTX_RESPONSE_PDU)
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pdu.session_id = org_pdu.session_id
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pdu.transaction_id = org_pdu.transaction_id
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pdu.packet_id = org_pdu.packet_id
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return pdu
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def send_pdu(self, pdu):
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if self.debug: pdu.dump()
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self.socket.send(pdu.encode())
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def recv_pdu(self):
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buf = self.socket.recv(1024)
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if not buf: return None
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pdu = PDU()
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pdu.decode(buf)
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if self.debug: pdu.dump()
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return pdu
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# =========================================
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def _get_updates(self):
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while True:
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try:
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item = self._queue.get_nowait()
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logger.debug('New update')
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update_oid = item['oid']
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update_data = item['data']
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# clear values with prefix oid
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for oid in list(self.data.keys()):
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if oid.startswith(update_oid):
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del (self.data[oid])
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# insert updated value
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for row in update_data.values():
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oid = "%s.%s" % (update_oid, row['name'])
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self.data[oid] = {
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'name': oid,
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'type': row['type'],
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'value': row['value']
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}
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# recalculate reverse index if data changed
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self.data_idx = sorted(
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self.data.keys(),
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key=lambda k: tuple(int(part) for part in k.split('.')))
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except queue.Empty:
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break
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def _get_next_oid(self, oid, endoid):
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if oid in self.data:
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# Exact match found
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#logger.debug('get_next_oid, exact match of %s' % oid)
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idx = self.data_idx.index(oid)
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if idx == (len(self.data_idx) - 1):
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# Last Item in MIB, No match!
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return None
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return self.data_idx[idx + 1]
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else:
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# No exact match, find prefix
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#logger.debug('get_next_oid, no exact match of %s' % oid)
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slist = oid.split('.')
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elist = endoid.split('.')
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for tmp_oid in self.data_idx:
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tlist = tmp_oid.split('.')
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for i in range(len(tlist)):
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try:
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sok = int(slist[i]) <= int(tlist[i])
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eok = int(elist[i]) >= int(tlist[i])
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if not (sok and eok):
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break
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except IndexError:
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pass
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if sok and eok:
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return tmp_oid
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return None # No match!
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def start(self):
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while True:
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try:
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self._start_network()
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except socket.error:
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logger.error("Network error, master disconnect?!")
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def _start_network(self):
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self._connect()
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logger.info("==== Open PDU ====")
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pdu = self.new_pdu(pyagentx.AGENTX_OPEN_PDU)
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self.send_pdu(pdu)
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pdu = self.recv_pdu()
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self.session_id = pdu.session_id
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logger.info("==== Ping PDU ====")
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pdu = self.new_pdu(pyagentx.AGENTX_PING_PDU)
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self.send_pdu(pdu)
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pdu = self.recv_pdu()
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logger.info("==== Register PDU ====")
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for oid in self._oid_list:
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logger.info("Registering: %s" % (oid))
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pdu = self.new_pdu(pyagentx.AGENTX_REGISTER_PDU)
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pdu.oid = oid
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self.send_pdu(pdu)
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pdu = self.recv_pdu()
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logger.info("==== Waiting for PDU ====")
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while True:
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try:
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self._get_updates()
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request = self.recv_pdu()
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except socket.timeout:
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continue
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if not request:
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logger.error("Empty PDU, connection closed!")
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raise socket.error
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response = self.response_pdu(request)
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if request.type == pyagentx.AGENTX_GET_PDU:
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logger.debug("Received GET PDU")
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for rvalue in request.range_list:
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oid = rvalue[0]
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logger.debug("OID: %s" % (oid))
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if oid in self.data:
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logger.debug("OID Found")
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response.values.append(self.data[oid])
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else:
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logger.debug("OID Not Found!")
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response.values.append({
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'type': pyagentx.TYPE_NOSUCHOBJECT,
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'name': rvalue[0],
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'value': 0
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})
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elif request.type == pyagentx.AGENTX_GETNEXT_PDU:
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logger.debug("Received GET_NEXT PDU")
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for rvalue in request.range_list:
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oid = self._get_next_oid(rvalue[0], rvalue[1])
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logger.debug("GET_NEXT: %s => %s" % (rvalue[0], oid))
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if oid:
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response.values.append(self.data[oid])
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else:
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response.values.append({
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'type': pyagentx.TYPE_ENDOFMIBVIEW,
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'name': rvalue[0],
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'value': 0
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})
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elif request.type == pyagentx.AGENTX_TESTSET_PDU:
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logger.info("Received TESTSET PDU")
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idx = 0
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for row in request.values:
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idx += 1
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oid = row['name']
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type_ = pyagentx.TYPE_NAME.get(row['type'], 'Unknown type')
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value = row['data']
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logger.info("Name: [%s] Type: [%s] Value: [%s]" %
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(oid, type_, value))
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# Find matching sethandler
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matching_oid = ''
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for target_oid in self._sethandlers:
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if oid.startswith(target_oid):
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matching_oid = target_oid
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break
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if matching_oid == '':
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logger.debug(
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'TestSet request failed: not writeable #%s' % idx)
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response.error = pyagentx.ERROR_NOTWRITABLE
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response.error_index = idx
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break
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try:
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self._sethandlers[matching_oid].network_test(
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request.session_id, request.transaction_id, oid,
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row['data'])
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except pyagentx.SetHandlerError:
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logger.debug(
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'TestSet request failed: wrong value #%s' % idx)
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response.error = pyagentx.ERROR_WRONGVALUE
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response.error_index = idx
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break
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logger.debug('TestSet request passed')
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elif request.type == pyagentx.AGENTX_COMMITSET_PDU:
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for handler in self._sethandlers.values():
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handler.network_commit(request.session_id,
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request.transaction_id)
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logger.info("Received COMMITSET PDU")
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elif request.type == pyagentx.AGENTX_UNDOSET_PDU:
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for handler in self._sethandlers.values():
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handler.network_undo(request.session_id,
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request.transaction_id)
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logger.info("Received UNDOSET PDU")
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elif request.type == pyagentx.AGENTX_CLEANUPSET_PDU:
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for handler in self._sethandlers.values():
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handler.network_cleanup(request.session_id,
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request.transaction_id)
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logger.info("Received CLEANUP PDU")
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self.send_pdu(response)
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