Add dell specific mibs (sonic-net#16)

src/sonic_ax_impl/main.py

@@ -12,6 +12,7 @@
 from sonic_ax_impl.mibs import ieee802_1ab
 from . import logger
 from .mibs.ietf import rfc1213, rfc2863, rfc4292, rfc4363
+from .mibs.vendor import dell
 
 # Background task update frequency ( in seconds )
 DEFAULT_UPDATE_FREQUENCY = 5
@@ -27,6 +28,7 @@ class SonicMIB(
     rfc4292.IpCidrRouteTable,
     ieee802_1ab.LLDPLocPortTable,
     ieee802_1ab.LLDPRemTable,
+    dell.force10.SSeriesMIB,
 ):
     """
     If SONiC was to create custom MIBEntries, they may be specified here.

src/sonic_ax_impl/mibs/vendor/__init__.py

@@ -0,0 +1,64 @@
+import collections
+import time
+
+import psutil
+
+from ax_interface import MIBUpdater
+from sonic_ax_impl import logger
+
+
+class SystemUtilizationHandler(MIBUpdater):
+    def __init__(self):
+        super().__init__()
+        # From the psutil documentation https://pythonhosted.org/psutil/#psutil.cpu_percent:
+        #
+        #    Warning the first time this function is called
+        #    with interval = 0.0 or None it will return a
+        #    meaningless 0.0 value which you are supposed
+        #    to ignore.
+        psutil.cpu_percent()
+        # '...is recommended for accuracy that this function be called with at least 0.1 seconds between calls.'
+        time.sleep(0.1)
+        # a sliding window of 60 contiguous 5 sec utilization (up to five minutes)
+        self.cpuutils = collections.deque([psutil.cpu_percent()], maxlen=60)
+        self.system_virtual_memory = psutil.virtual_memory()
+
+        logger.debug('System Utilization handler initialized.')
+
+    def get_cpuutil_5sec(self):
+        """
+        :return: Last polled CPU utilization.
+        """
+        return int(self.cpuutils[-1])
+
+    def get_cpuutil_1min(self):
+        """
+        :return: Up to one minute's worth of average CPU utilization.
+        """
+        past_utilization = list(self.cpuutils)[-12:]
+        return int(sum(past_utilization) / len(past_utilization))
+
+    def get_cpuutil_5min(self):
+        """
+        :return: Up to five minute's worth of average CPU utilization.
+        """
+        return int(sum(self.cpuutils) / len(self.cpuutils))
+
+    def get_memutil(self):
+        """
+        :return: The current memory utilization (as a percent integer)
+        """
+        return int(self.system_virtual_memory.percent)
+
+    def update_data(self):
+        """
+        Background task to add CPU Utilization sample / refresh memory utilization.
+        """
+        cpu_util = psutil.cpu_percent()
+        self.cpuutils.append(cpu_util)
+        self.system_virtual_memory = psutil.virtual_memory()
+
+        logger.debug('Updating CPU/Mem Utilization with: {}% / {}%'.format(cpu_util, self.get_memutil()))
+
+
+sys_util_h = SystemUtilizationHandler()

src/sonic_ax_impl/mibs/vendor/dell/__init__.py

@@ -0,0 +1 @@
+from . import force10

src/sonic_ax_impl/mibs/vendor/dell/force10.py

@@ -0,0 +1,24 @@
+from ax_interface import MIBMeta, ValueType
+from ax_interface.mib import MIBEntry
+from sonic_ax_impl.mibs.vendor import sys_util_h
+
+
+class SSeriesMIB(metaclass=MIBMeta, prefix='.1.3.6.1.4.1.6027.3.10.1.2.9'):
+    """
+    -- .iso.org.dod.internet.private.enterprises
+    .force10.f10Mgmt.f10ChassisMib.f10ChassisMibObject
+    .chRpmObjects.chRpmUtilTable.chRpmUtilEntry.chRpmCpuUtil5Min
+    """
+    updater = sys_util_h
+
+    # S-Series CPU utilization in percentage for last 5 seconds
+    chStackUnitCpuUtil5sec = MIBEntry('1.2.1', ValueType.GAUGE_32, sys_util_h.get_cpuutil_5sec)
+
+    # S-Series CPU utilization in percentage for last 1 minute.
+    chStackUnitCpuUtil1Min = MIBEntry('1.3.1', ValueType.GAUGE_32, sys_util_h.get_cpuutil_1min)
+
+    # S-Series CPU utilization in percentage for last 5 minutes.
+    chStackUnitCpuUtil5Min = MIBEntry('1.4.1', ValueType.GAUGE_32, sys_util_h.get_cpuutil_5min)
+
+    # Stack member total memory usage in percentage
+    chStackUnitMemUsageUtil = MIBEntry('1.5.1', ValueType.GAUGE_32, sys_util_h.get_memutil)