Python 具有GetNext或Walk操作的Pysnmp命令响应程序

我正在实现一个Pysnmp响应程序，它当前接收snmpget/SET请求，并希望通过Walk、getNext和getBulk操作进行扩展。所有OID及其值都存储在文件的键值中

我尝试使用instrum.AbstractMibInstrumController类中的readNextVars（）方法，通过在readNextVars（）中调用self.readVars（）迭代OID的列表

下面是一段代码片段，它只显示GET请求和SET请求类似，但它将值写入OID.json文件中的相应OID

from pysnmp.entity import engine, config
from pysnmp.entity.rfc3413 import cmdrsp, context
from pysnmp.carrier.asynsock.dgram import udp
from pysnmp.smi import instrum, error
from pysnmp.proto.api import v2c
import json

class SnmpData:

    def __init__(self, host, port):
        self.snmpEngine = engine.SnmpEngine()

        config.addSocketTransport(
            self.snmpEngine,
            udp.domainName,
            udp.UdpTransport().openServerMode((host, port))
        )
        config.addV1System(self.snmpEngine, 'my-area', 'public', contextName='my-context')

        config.addVacmUser(self.snmpEngine, 2, 'my-area', 'noAuthNoPriv', (1, 3, 6), (4, 5, 7))

        self.snmpContext = context.SnmpContext(self.snmpEngine)

    def snmp_run_command(self):
        self.snmpContext.registerContextName(
            v2c.OctetString('my-context'),
            FileInstrumController()
        )

        cmdrsp.GetCommandResponder(self.snmpEngine, self.snmpContext)
        cmdrsp.SetCommandResponder(self.snmpEngine, self.snmpContext)
        cmdrsp.NextCommandResponder(self.snmpEngine, self.snmpContext)
        cmdrsp.BulkCommandResponder(self.snmpEngine, self.snmpContext)

        self.snmpEngine.transportDispatcher.jobStarted(1)

        try:
            self.snmpEngine.transportDispatcher.runDispatcher()
        except:
            self.snmpEngine.transportDispatcher.closeDispatcher()
            return "yes"

    def main(self):
        self.snmp_run_command()

class FileInstrumController(instrum.AbstractMibInstrumController):
    def readVars(self, vars, acInfo=(None, None)):
        try:
            data = None
            final_data = None
            with open('oid.json') as f:
                data = json.load(f)

                if str(vars[0][0]) in data.keys())):
                    final_data = data[str(vars[0][0])]
                    return [(vars[0][0], v2c.OctetString(str(final_data)))]
                else:
                    return [(vars[0][0], v2c.OctetString(str("Not a Valid OID")))]
        except IOError:
            raise error.SmiError

    def readNextVars(self, vars, acInfo=(None, None))
        # get oid & split and match if in file than return its value
        # else return invalid oid and break but its not breaking 
        # and sending continuously requests of next oid (OID + 1)

这是oid文件（oid.json）

{
      "1.3.6.1.1.999.1.1.0": 1,
      "1.3.6.1.1.999.1.2.0": 2,
      "1.3.6.1.1.999.1.3.0": 3,
      "1.3.6.1.1.999.1.4.0": 4,
      "1.3.6.1.1.999.1.5.0": 5,
      "1.3.6.1.1.999.1.6.0": 100,
      "1.3.6.1.1.999.1.7.0": 200,
      "1.3.6.1.1.999.1.8.0": 300,
      "1.3.6.1.1.999.1.9.0": 400,
      "1.3.6.1.1.999.1.10.0": 500
}