#
from __future__ import print_function
-import sys, os, logging, collections, struct, json, threading, glob
-import atexit, Queue
-
+import sys
+import os
+import logging
+import collections
+import struct
+import json
+import threading
+import glob
+import atexit
from cffi import FFI
+
+if sys.version[0] == '2':
+ import Queue as queue
+else:
+ import queue as queue
+
ffi = FFI()
ffi.cdef("""
typedef void (*vac_callback_t)(unsigned char * data, int len);
# Barfs on failure, no need to check success.
vpp_api = ffi.dlopen('libvppapiclient.so')
+
def vpp_atexit(self):
"""Clean up VPP connection on shutdown."""
if self.connected:
vpp_object = None
+
+def vpp_iterator(d):
+ if sys.version[0] == '2':
+ return d.iteritems()
+ else:
+ return d.items()
+
+
@ffi.callback("void(unsigned char *, int)")
def vac_callback_sync(data, len):
vpp_object.msg_handler_sync(ffi.buffer(data, len))
+
+
@ffi.callback("void(unsigned char *, int)")
def vac_callback_async(data, len):
vpp_object.msg_handler_async(ffi.buffer(data, len))
+
+
@ffi.callback("void(void *, unsigned char *, int)")
def vac_error_handler(arg, msg, msg_len):
- vpp_object.logger.warning("PNEUM: %s", ffi.string(msg, msg_len))
+ vpp_object.logger.warning("VPP API client:: %s", ffi.string(msg, msg_len))
+
class Empty(object):
pass
provides a means to register a callback function to receive
these messages in a background thread.
"""
- def __init__(self, apifiles = None, testmode = False, async_thread = True,
- logger = logging.getLogger('vpp_papi'), loglevel = 'debug'):
+ def __init__(self, apifiles=None, testmode=False, async_thread=True,
+ logger=logging.getLogger('vpp_papi'), loglevel='debug'):
"""Create a VPP API object.
apifiles is a list of files containing API
self.header = struct.Struct('>HI')
self.apifiles = []
self.event_callback = None
- self.message_queue = Queue.Queue()
+ self.message_queue = queue.Queue()
self.read_timeout = 0
self.vpp_api = vpp_api
if async_thread:
- self.event_thread = threading.Thread(target=self.thread_msg_handler)
+ self.event_thread = threading.Thread(
+ target=self.thread_msg_handler)
self.event_thread.daemon = True
self.event_thread.start()
for m in api['messages']:
self.add_message(m[0], m[1:])
- self.apifiles = apifiles
+ self.apifiles = apifiles
# Basic sanity check
if len(self.messages) == 0 and not testmode:
"""Thread-safe provider of unique context IDs."""
def __init__(self):
self.context = 0
- self.lock = threading.Lock()
+ self.lock = threading.Lock()
+
def __call__(self):
"""Get a new unique (or, at least, not recently used) context."""
- with self.lock:
- self.context += 1
- return self.context
+ with self.lock:
+ 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', ', '.join(self.apifiles))
- def __struct (self, t, n = None, e = -1, vl = None):
+ def __struct(self, t, n=None, e=-1, vl=None):
"""Create a packing structure for a message."""
- base_types = { 'u8' : 'B',
- 'u16' : 'H',
- 'u32' : 'I',
- 'i32' : 'i',
- 'u64' : 'Q',
- 'f64' : 'd',
- }
+ 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]
return struct.Struct('>' + base_types[t])
if t in self.messages:
- ### Return a list in case of array ###
+ # Return a list in case of array
if e > 0 and not vl:
return [e, lambda self, encode, buf, offset, args: (
self.__struct_type(encode, self.messages[t], buf, offset,
args))]
elif e == 0:
# Old style VLA
- raise NotImplementedError(1, 'No support for compound types ' + t)
+ raise NotImplementedError(1,
+ 'No support for compound types ' + t)
return lambda self, encode, buf, offset, args: (
self.__struct_type(encode, self.messages[t], buf, offset, args)
)
if k not in msgdef['args']:
raise ValueError(1, 'Invalid field-name in message call ' + k)
- for k,v in msgdef['args'].iteritems():
+ for k, v in vpp_iterator(msgdef['args']):
off += size
if k in kwargs:
if type(v) is list:
return off + size - offset
-
def __getitem__(self, name):
if name in self.messages:
return self.messages[name]
res = []
off = offset
size = 0
- for k,v in msgdef['args'].iteritems():
+ for k, v in vpp_iterator(msgdef['args']):
off += size
if type(v) is list:
lst = []
- if callable(v[1]): # compound type
+ if callable(v[1]): # compound type
size = 0
- if v[0] in msgdef['args']: # vla
+ if v[0] in msgdef['args']: # vla
e = res[v[2]]
- else: # fixed array
+ else: # fixed array
e = v[0]
res.append(lst)
for i in range(e):
- (s,l) = v[1](self, False, buf, off + size, None)
+ (s, l) = v[1](self, False, buf, off + size, None)
lst.append(l)
size += s
continue
size += v[1].size
else:
if callable(v):
- (s,l) = v(self, False, buf, off, None)
+ (s, l) = v(self, False, buf, off, None)
res.append(l)
size += s
else:
return self.messages[name]['return_tuple']
return None
- def add_message(self, name, msgdef, typeonly = False):
+ def add_message(self, name, msgdef, typeonly=False):
if name in self.messages:
raise ValueError('Duplicate message name: ' + name)
raise ValueError('Variable Length Array must be last: ' + name)
args[field_name] = self.__struct(*f)
argtypes[field_name] = field_type
- if len(f) == 4: # Find offset to # elements field
- args[field_name].append(args.keys().index(f[3]) - i)
+ if len(f) == 4: # Find offset to # elements field
+ idx = list(args.keys()).index(f[3]) - i
+ args[field_name].append(idx)
fields.append(field_name)
msg['return_tuple'] = collections.namedtuple(name, fields,
- rename = True)
+ rename=True)
self.messages[name] = msg
self.messages[name]['args'] = args
self.messages[name]['argtypes'] = argtypes
return self.messages[name]
def add_type(self, name, typedef):
- return self.add_message('vl_api_' + name + '_t', typedef, typeonly=True)
+ return self.add_message('vl_api_' + name + '_t', typedef,
+ typeonly=True)
def make_function(self, name, i, msgdef, multipart, async):
if (async):
f = lambda **kwargs: (self._call_vpp_async(i, msgdef, **kwargs))
else:
- f = lambda **kwargs: (self._call_vpp(i, msgdef, multipart, **kwargs))
+ f = lambda **kwargs: (self._call_vpp(i, msgdef, multipart,
+ **kwargs))
args = self.messages[name]['args']
argtypes = self.messages[name]['argtypes']
f.__name__ = str(name)
- f.__doc__ = ", ".join(["%s %s" % (argtypes[k], k) for k in args.keys()])
+ f.__doc__ = ", ".join(["%s %s" %
+ (argtypes[k], k) for k in args.keys()])
return f
@property
self.id_names = [None] * (self.vpp_dictionary_maxid + 1)
self.id_msgdef = [None] * (self.vpp_dictionary_maxid + 1)
self._api = Empty()
- for name, msgdef in self.messages.iteritems():
- if self.messages[name]['typeonly']: continue
+ for name, msgdef in vpp_iterator(self.messages):
+ if self.messages[name]['typeonly']:
+ continue
crc = self.messages[name]['crc']
n = name + '_' + crc[2:]
- i = vpp_api.vac_get_msg_index(bytes(n))
+ i = vpp_api.vac_get_msg_index(n.encode())
if i > 0:
self.id_msgdef[i] = msgdef
self.id_names[i] = name
setattr(self, name, f)
# old API stuff ends here
else:
- self.logger.debug('No such message type or failed CRC checksum: %s', n)
+ self.logger.debug(
+ 'No such message type or failed CRC checksum: %s', n)
- def _write (self, buf):
+ def _write(self, buf):
"""Send a binary-packed message to VPP."""
if not self.connected:
raise IOError(1, 'Not connected')
- return vpp_api.vac_write(str(buf), len(buf))
+ return vpp_api.vac_write(ffi.from_buffer(buf), len(buf))
- def _read (self):
+ def _read(self):
if not self.connected:
raise IOError(1, 'Not connected')
mem = ffi.new("char **")
vpp_api.vac_free(mem[0])
return msg
- def connect_internal(self, name, msg_handler, chroot_prefix, rx_qlen, async):
- rv = vpp_api.vac_connect(name, chroot_prefix, msg_handler, rx_qlen)
+ def connect_internal(self, name, msg_handler, chroot_prefix, rx_qlen,
+ async):
+ rv = vpp_api.vac_connect(name.encode(), chroot_prefix.encode(),
+ msg_handler, rx_qlen)
if rv != 0:
raise IOError(2, 'Connect failed')
self.connected = True
# Initialise control ping
crc = self.messages['control_ping']['crc']
- self.control_ping_index = \
- vpp_api.vac_get_msg_index(
- bytes('control_ping' + '_' + crc[2:]))
+ self.control_ping_index = vpp_api.vac_get_msg_index(
+ ('control_ping' + '_' + crc[2:]).encode())
self.control_ping_msgdef = self.messages['control_ping']
+ return rv
- def connect(self, name, chroot_prefix = ffi.NULL,
- async = False, rx_qlen = 32):
+ def connect(self, name, chroot_prefix=ffi.NULL, async=False, rx_qlen=32):
"""Attach to VPP.
name - the name of the client.
rx_qlen - the length of the VPP message receive queue between
client and server.
"""
- msg_handler = vac_callback_sync if not async \
- else vac_callback_async
+ msg_handler = vac_callback_sync if not async else vac_callback_async
return self.connect_internal(name, msg_handler, chroot_prefix, rx_qlen,
async)
- def connect_sync (self, name, chroot_prefix = ffi.NULL, rx_qlen = 32):
+ def connect_sync(self, name, chroot_prefix=ffi.NULL, rx_qlen=32):
"""Attach to VPP in synchronous mode. Application must poll for events.
name - the name of the client.
msgname = type(r).__name__
- if self.event_callback:
- self.event_callback(msgname, r)
+ if self.event_callback:
+ self.event_callback(msgname, r)
def _control_ping(self, context):
"""Send a ping command."""
self._call_vpp_async(self.control_ping_index,
- self.control_ping_msgdef,
+ self.control_ping_msgdef,
context=context)
def _call_vpp(self, i, msgdef, multipart, **kwargs):
no response within the timeout window.
"""
- if not 'context' in kwargs:
+ if 'context' not in kwargs:
context = self.get_context()
kwargs['context'] = context
else:
while (True):
msg = self._read()
if not msg:
- print('PNEUM ERROR: OH MY GOD')
- raise IOError(2, 'PNEUM read failed')
+ raise IOError(2, 'VPP API client: read failed')
r = self.decode_incoming_msg(msg)
msgname = type(r).__name__
- if not context in r or r.context == 0 or context != r.context:
+ if context not in r or r.context == 0 or context != r.context:
self.message_queue.put_nowait(r)
continue
supplied.
The remainder of the kwargs are the arguments to the API call.
"""
- if not 'context' in kwargs:
+ if 'context' not in kwargs:
context = self.get_context()
kwargs['context'] = context
else:
while True:
r = self.message_queue.get()
msgname = type(r).__name__
- if self.event_callback:
- self.event_callback(msgname, r)
+ if self.event_callback:
+ self.event_callback(msgname, r)
Code Review / vpp.git / commitdiff