Add VPP API support to retrieve mtu/ifspeed/operstatus/adminstatus/mac

vppapi.py

@@ -0,0 +1,85 @@
+'''
+The functions in this file interact with the VPP API to retrieve certain
+interface metadata.
+'''
+
+from vpp_papi import VPPApiClient
+import os
+import fnmatch
+import logging
+import threading
+
+
+class NullHandler(logging.Handler):
+    def emit(self, record):
+        pass
+
+
+logger = logging.getLogger('pyagentx.vppapi')
+logger.addHandler(NullHandler())
+
+vpp_lock = threading.Lock()
+
+
+def vpp_connect():
+    global logger
+
+    vpp_json_dir = '/usr/share/vpp/api/'
+
+    # construct a list of all the json api files
+    jsonfiles = []
+    for root, dirnames, filenames in os.walk(vpp_json_dir):
+        for filename in fnmatch.filter(filenames, '*.api.json'):
+            jsonfiles.append(os.path.join(root, filename))
+
+    if not jsonfiles:
+        logger.error('no json api files found')
+        return False
+
+    vpp = VPPApiClient(apifiles=jsonfiles, server_address='/run/vpp/api.sock')
+    try:
+        vpp.connect('vpp-snmp-agent')
+    except:
+        return False
+
+    v = vpp.api.show_version()
+    logger.info('VPP version is %s' % v.version)
+
+    return vpp
+
+
+def get_iface(vpp, ifname):
+    global logger
+
+    vpp_lock.acquire()
+    iface_list = vpp.api.sw_interface_dump(name_filter=ifname,
+                                           name_filter_valid=True)
+    if not iface_list:
+        logger.error("Can't get interface %s" % ifname)
+        vpp_lock.release()
+        return None
+
+    for iface in iface_list:
+        if iface.interface_name == ifname:
+            vpp_lock.release()
+            return iface
+    vpp_lock.release()
+    return None
+
+
+def get_ifaces(vpp):
+    global logger
+
+    vpp_lock.acquire()
+    ret = {}
+    iface_list = vpp.api.sw_interface_dump()
+    if not iface_list:
+        logger.error("Can't get interface list")
+        vpp_lock.release()
+        return ret
+
+    for iface in iface_list:
+        ret[iface.interface_name] = iface
+
+    vpp_lock.release()
+    return ret