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#
# Copyright (c) 2016 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Import C API shared object
#
from __future__ import print_function
import signal, os, sys
from struct import *
import vpp_api
from vpp_api_base import *
# Import API definitions. The core VPE API is imported into main namespace
import memclnt
# Cheating a bit, importing it into this namespace as well as a module.
import vpe
from vpe import *
def eprint(*args, **kwargs):
print(*args, file=sys.stderr, **kwargs)
def msg_handler(msg):
if not msg:
eprint('vpp_api.read failed')
return
id = unpack('>H', msg[0:2])
if id[0] == memclnt.VL_API_RX_THREAD_EXIT:
return;
#
# Decode message and returns a tuple.
#
try:
r = api_func_table[id[0]](msg)
except:
eprint('Message decode failed', id[0], api_func_table[id[0]])
raise
if 'context' in r._asdict():
if r.context > 0:
context = r.context
#
# XXX: Call provided callback for event
# Are we guaranteed to not get an event during processing of other messages?
# How to differentiate what's a callback message and what not? Context = 0?
#
if not is_waiting_for_reply():
event_callback_call(r)
return
#
# Collect results until control ping
#
if id[0] == VL_API_CONTROL_PING_REPLY:
results_event_set(context)
waiting_for_reply_clear()
return
if not is_results_context(context):
eprint('Not expecting results for this context', context)
return
if is_results_more(context):
results_append(context, r)
return
results_set(context, r)
results_event_set(context)
waiting_for_reply_clear()
def handler(signum, frame):
print('Signal handler called with signal', signum)
raise IOError("Couldn't connect to VPP!")
def connect(name, chroot_prefix = None):
# Set the signal handler
signal.signal(signal.SIGALRM, handler)
signal.alarm(3) # 3 second
if not chroot_prefix:
rv = vpp_api.connect(name, msg_handler)
else:
rv = vpp_api.connect(name, msg_handler, chroot_prefix)
signal.alarm(0)
#
# Assign message id space for plugins
#
try:
plugin_map_plugins()
except:
return -1
return rv
def disconnect():
rv = vpp_api.disconnect()
return rv
def register_event_callback(callback):
event_callback_set(callback)
def plugin_name_to_id(plugin, name_to_id_table, base):
try:
m = globals()[plugin]
except KeyError:
m = sys.modules[plugin]
for name in name_to_id_table:
setattr(m, name, name_to_id_table[name] + base)
def plugin_map_plugins():
for p in plugins:
if p == 'memclnt' or p == 'vpe':
continue
#
# Find base
# Update api table
#
version = plugins[p]['version']
name = p + '_' + format(version, '08x')
r = memclnt.get_first_msg_id(name)
if r.retval != 0:
eprint('Failed getting first msg id for:', p, r, name)
raise
# Set base
base = r.first_msg_id
msg_id_base_set = plugins[p]['msg_id_base_set']
msg_id_base_set(base)
plugins[p]['base'] = base
func_table = plugins[p]['func_table']
i = r.first_msg_id
# Insert doesn't extend the table
if i + len(func_table) > len(api_func_table):
fill = [None] * (i + len(func_table) - len(api_func_table))
api_func_table.extend(fill)
for entry in func_table:
api_func_table[i] = entry
i += 1
plugin_name_to_id(p, plugins[p]['name_to_id_table'], base)
#
# Set up core API
#
memclnt.msg_id_base_set(1)
plugins['memclnt']['base'] = 1
# vpe
msg_id_base_set(len(plugins['memclnt']['func_table']) + 1)
plugins['vpe']['base'] = len(plugins['memclnt']['func_table']) + 1
api_func_table = []
api_func_table.append(None)
api_func_table[1:] = plugins['memclnt']['func_table'] + plugins['vpe']['func_table']
plugin_name_to_id('memclnt', plugins['memclnt']['name_to_id_table'], 1)
plugin_name_to_id('vpe', plugins['vpe']['name_to_id_table'], plugins['vpe']['base'])
plugin_name_to_id(__name__, plugins['vpe']['name_to_id_table'], plugins['vpe']['base'])
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