+#!/usr/bin/env python
#
# Copyright (c) 2016 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# 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 sys, os, logging, collections, struct, json, threading
+logging.basicConfig(level=logging.DEBUG)
+import vpp_api
-import signal, os, sys
-from struct import *
+def eprint(*args, **kwargs):
+ print(*args, file=sys.stderr, **kwargs)
-import vpp_api
-from vpp_api_base import *
+class VPP():
+ def __init__(self, apifiles):
+ self.messages = {}
+ self.id_names = []
+ self.id_msgdef = []
+ self.buffersize = 10000
+ self.connected = False
+ self.header = struct.Struct('>HI')
+ self.results = {}
+ self.timeout = 5
+ self.apifile = []
-# Import API definitions. The core VPE API is imported into main namespace
-import memclnt
+ for file in apifiles:
+ self.apifile.append(file)
+ with open(file) as apidef_file:
+ api = json.load(apidef_file)
+ for t in api['types']:
+ self.add_type(t[0], t[1:])
-# Cheating a bit, importing it into this namespace as well as a module.
-import vpe
-from vpe import *
+ for m in api['messages']:
+ self.add_message(m[0], m[1:])
-def eprint(*args, **kwargs):
- print(*args, file=sys.stderr, **kwargs)
+ # Basic sanity check
+ if not 'control_ping' in self.messages:
+ raise ValueError(1, 'Error in JSON message definitions')
+
+
+ class ContextId(object):
+ def __init__(self):
+ self.context = 0
+ def __call__(self):
+ self.context += 1
+ return self.context
+ get_context = ContextId()
+
+ def status(self):
+ print('Connected') if self.connected else print('Not Connected')
+ print('Read API definitions from', self.apifile)
+
+ def __struct (self, t, n = None, e = 0, vl = None):
+ base_types = { 'u8' : 'B',
+ 'u16' : 'H',
+ 'u32' : 'I',
+ 'i32' : 'i',
+ 'u64' : 'Q',
+ 'f64' : 'd',
+ }
+ pack = None
+ if t in base_types:
+ pack = base_types[t]
+ if not vl:
+ if e and t == 'u8':
+ # Fixed byte array
+ return struct.Struct('>' + str(e) + 's')
+ if e:
+ # Fixed array of base type
+ return [e, struct.Struct('>' + base_types[t])]
+ else:
+ # Variable length array
+ return [vl, struct.Struct('>s')] if t == 'u8' else [vl, struct.Struct('>' + base_types[t])]
+
+ return struct.Struct('>' + base_types[t])
+
+ if t in self.messages:
+ ### Return a list in case of array ###
+ if e and not vl:
+ return [e, lambda self, encode, buf, offset, args: (
+ self.__struct_type(encode, self.messages[t], buf, offset, args)
+ )]
+ if vl:
+ return [vl, lambda self, encode, buf, offset, args: (
+ self.__struct_type(encode, self.messages[t], buf, offset, args)
+ )]
+ return lambda self, encode, buf, offset, args: (
+ self.__struct_type(encode, self.messages[t], buf, offset, args)
+ )
+
+ raise ValueError
+
+ def __struct_type(self, encode, msgdef, buf, offset, kwargs):
+ if encode:
+ return self.__struct_type_encode(msgdef, buf, offset, kwargs)
+ else:
+ return self.__struct_type_decode(msgdef, buf, offset)
+
+ def __struct_type_encode(self, msgdef, buf, offset, kwargs):
+ off = offset
+ size = 0
+ for k,v in msgdef['args'].iteritems():
+ off += size
+ if k in kwargs:
+ if type(v) is list:
+ if callable(v[1]):
+ if v[0] in kwargs:
+ e = kwargs[v[0]]
+ else:
+ e = v[0]
+ size = 0
+ for i in range(e):
+ size += v[1](self, True, buf, off + size,
+ kwargs[k][i])
+ else:
+ if v[0] in kwargs:
+ l = kwargs[v[0]]
+ else:
+ l = len(kwargs[k])
+ if v[1].size == 1:
+ buf[off:off + l] = bytearray(kwargs[k])
+ size = l
+ else:
+ size = 0
+ for i in kwargs[k]:
+ v[1].pack_into(buf, off + size, i)
+ size += v[1].size
+ else:
+ if callable(v):
+ size = v(self, True, buf, off, kwargs[k])
+ else:
+ v.pack_into(buf, off, kwargs[k])
+ size = v.size
+ else:
+ size = v.size
+
+ return off + size - offset
+
+
+ def __getitem__(self, name):
+ if name in self.messages:
+ return self.messages[name]
+ return None
+
+ def encode(self, msgdef, kwargs):
+ # Make suitably large buffer
+ buf = bytearray(self.buffersize)
+ offset = 0
+ size = self.__struct_type(True, msgdef, buf, offset, kwargs)
+ return buf[:offset + size]
+
+ def decode(self, msgdef, buf):
+ return self.__struct_type(False, msgdef, buf, 0, None)[1]
+
+ def __struct_type_decode(self, msgdef, buf, offset):
+ res = []
+ off = offset
+ size = 0
+ for k,v in msgdef['args'].iteritems():
+ off += size
+ if type(v) is list:
+ lst = []
+ if callable(v[1]): # compound type
+ size = 0
+ if v[0] in msgdef['args']: # vla
+ e = int(res[-1])
+ else: # fixed array
+ e = v[0]
+ res.append(lst)
+ for i in range(e):
+ (s,l) = v[1](self, False, buf, off + size, None)
+ lst.append(l)
+ size += s
+ continue
+
+ if v[1].size == 1:
+ size = int(res[-1])
+ res.append(buf[off:off + size])
+ else:
+ e = int(res[-1])
+ if e == 0:
+ raise ValueError
+ lst = []
+ res.append(lst)
+ size = 0
+ for i in range(e):
+ lst.append(v[1].unpack_from(buf, off + size)[0])
+ size += v[1].size
+ else:
+ if callable(v):
+ (s,l) = v(self, False, buf, off, None)
+ res.append(l)
+ size += s
+ else:
+ res.append(v.unpack_from(buf, off)[0])
+ size = v.size
+
+ return off + size - offset, msgdef['return_tuple']._make(res)
+
+ def ret_tup(self, name):
+ if name in self.messages and 'return_tuple' in self.messages[name]:
+ return self.messages[name]['return_tuple']
+ return None
+
+ def add_message(self, name, msgdef):
+ if name in self.messages:
+ raise ValueError('Duplicate message name: ' + name)
+
+ args = collections.OrderedDict()
+ fields = []
+ msg = {}
+ for f in msgdef:
+ if type(f) is dict and 'crc' in f:
+ msg['crc'] = f['crc']
+ continue
+ field_name = f[1]
+ args[field_name] = self.__struct(*f)
+ fields.append(field_name)
+ msg['return_tuple'] = collections.namedtuple(name, fields,
+ rename = True)
+ self.messages[name] = msg
+ self.messages[name]['args'] = args
+ return self.messages[name]
+
+ def add_type(self, name, typedef):
+ self.add_message('vl_api_' + name + '_t', typedef)
+
+ def make_function(self, i, msgdef, multipart):
+ return lambda **kwargs: (self._call_vpp(i, msgdef, multipart, **kwargs))
+
+ def _register_functions(self):
+ self.id_names = [None] * (self.vpp_dictionary_maxid + 1)
+ self.id_msgdef = [None] * (self.vpp_dictionary_maxid + 1)
+ for name, msgdef in self.messages.iteritems():
+ if name in self.vpp_dictionary:
+ if self.messages[name]['crc'] != self.vpp_dictionary[name]['crc']:
+ raise ValueError(3, 'Failed CRC checksum ' + name +
+ ' ' + self.messages[name]['crc'] +
+ ' ' + self.vpp_dictionary[name]['crc'])
+ i = self.vpp_dictionary[name]['id']
+ self.id_msgdef[i] = msgdef
+ self.id_names[i] = name
+ multipart = True if name.find('_dump') > 0 else False
+ setattr(self, name, self.make_function(i, msgdef, multipart))
+
+ def _write (self, buf):
+ if not self.connected:
+ raise IOError(1, 'Not connected')
+ return vpp_api.write(str(buf))
-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
+ def _load_dictionary(self):
+ self.vpp_dictionary = {}
+ self.vpp_dictionary_maxid = 0
+
+ d = vpp_api.msg_table()
+
+ if not d:
+ raise IOError(3, 'Cannot get VPP API dictionary')
+ for i,n in d:
+ name, crc = n.rsplit('_', 1)
+ crc = '0x' + crc
+ self.vpp_dictionary[name] = { 'id' : i, 'crc' : crc }
+ self.vpp_dictionary_maxid = max(self.vpp_dictionary_maxid, i)
+
+ def connect(self, name, chroot_prefix = None):
+ if not chroot_prefix:
+ rv = vpp_api.connect(name, self.msg_handler)
+ else:
+ rv = vpp_api.connect(name, self.msg_handler, chroot_prefix)
+
+ if rv != 0:
+ raise IOError(2, 'Connect failed')
+
+ self._load_dictionary()
+ self._register_functions()
+
+ # Initialise control ping
+ self.control_ping_index = self.vpp_dictionary['control_ping']['id']
+ self.control_ping_msgdef = self.messages['control_ping']
+
+ self.connected = True
+
+ def disconnect(self):
+ rv = vpp_api.disconnect()
+ return rv
+
+ def results_wait(self, context):
+ return (self.results[context]['e'].wait(self.timeout))
+
+ def results_prepare(self, context):
+ self.results[context] = {}
+ self.results[context]['e'] = threading.Event()
+ self.results[context]['e'].clear()
+ self.results[context]['r'] = []
+
+ def results_clean(self, context):
+ del self.results[context]
+
+ def msg_handler(self, msg):
+ if not msg:
+ eprint('vpp_api.read failed')
+ return
+
+ i, ci = self.header.unpack_from(msg, 0)
+ if self.id_names[i] == 'rx_thread_exit':
+ return;
#
- # Find base
- # Update api table
+ # Decode message and returns a tuple.
#
- 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)
+ msgdef = self.id_msgdef[i]
+ if not msgdef:
+ raise IOError(2, 'Reply message undefined')
+
+ r = self.decode(msgdef, msg)
+ if 'context' in r._asdict():
+ if r.context > 0:
+ context = r.context
+
+ msgname = type(r).__name__
+
+ #
+ # 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():
+ if r.context == 0 and self.event_callback:
+ self.event_callback(msgname, r)
+ return
+
+ #
+ # Collect results until control ping
+ #
+ if msgname == 'control_ping_reply':
+ self.results[context]['e'].set()
+ return
+
+ if not context in self.results:
+ eprint('Not expecting results for this context', context)
+ return
+
+ if 'm' in self.results[context]:
+ self.results[context]['r'].append(r)
+ return
+
+ self.results[context]['r'] = r
+ self.results[context]['e'].set()
+
+ def _control_ping(self, context):
+ self._write(self.encode(self.control_ping_msgdef,
+ { '_vl_msg_id' : self.control_ping_index,
+ 'context' : context}))
+
+ def _call_vpp(self, i, msgdef, multipart, **kwargs):
+ if not 'context' in kwargs:
+ context = self.get_context()
+ kwargs['context'] = context
+ else:
+ context = kwargs['context']
+ kwargs['_vl_msg_id'] = i
+ b = self.encode(msgdef, kwargs)
+
+ self.results_prepare(context)
+
+ if multipart:
+ self.results[context]['m'] = True
+ self._control_ping(context)
+
+ self._write(b)
+
+ self.results_wait(context)
+ r = self.results[context]['r']
+ self.results_clean(context)
+ return r
+
+ def register_event_callback(self, callback):
+ self.event_callback = callback
-#
-# 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'])
Code Review / vpp.git / blobdiff