Python API: Change from cPython to CFFI.

Change-Id: I03e52466fb3f909ae52b8fba601168f3eadbd972
Signed-off-by: Ole Troan <ot@cisco.com>

3 files changed, 0 insertions, 828 deletions

diff --git a/src/vpp-api/python/vpp_papi/__init__.py b/src/vpp-api/python/vpp_papi/__init__.py
deleted file mode 100644
index 6688ffb8ced..00000000000
--- a/src/vpp-api/python/vpp_papi/__init__.py
+++ /dev/null
@@ -1,3 +0,0 @@
-__import__('pkg_resources').declare_namespace(__name__)
-from . vpp_papi import *
-
diff --git a/src/vpp-api/python/vpp_papi/pneum_wrap.c b/src/vpp-api/python/vpp_papi/pneum_wrap.c
deleted file mode 100644
index c5a7eea1e00..00000000000
--- a/src/vpp-api/python/vpp_papi/pneum_wrap.c
+++ /dev/null
@@ -1,226 +0,0 @@
-/*
- * 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.
- */
-
-#include <Python.h>
-#include "../pneum/pneum.h"
-#include <vppinfra/hash.h>
-
-static PyObject *pneum_callback = NULL;
-
-static void
-wrap_pneum_callback (unsigned char * data, int len)
-{
-  PyGILState_STATE gstate;
-  PyObject *result;//, *arglist;
-
-  gstate = PyGILState_Ensure();
-
-  /* Time to call the callback */
-#if PY_VERSION_HEX >= 0x03000000
-  result = PyObject_CallFunction(pneum_callback, "y#", data, len);
-#else
-  result = PyObject_CallFunction(pneum_callback, "s#", data, len);
-#endif
-  if (result)
-    Py_DECREF(result);
-  else
-    PyErr_Print();
-
-  PyGILState_Release(gstate);
-}
-
-static PyObject *
-wrap_connect (PyObject *self, PyObject *args, PyObject *kw)
-{
-  char * name, * chroot_prefix = NULL;
-  int rx_qlen = 32; /* default rx queue length */
-  int rv;
-  PyObject * temp = NULL;
-  pneum_callback_t cb = NULL;
-
-  if (!PyArg_ParseTuple(args, "sOzi:wrap_connect",
-			&name, &temp, &chroot_prefix, &rx_qlen))
-    return (NULL);
-
-  if (temp != Py_None)
-    {
-      if (!PyCallable_Check(temp))
-	{
-	  PyErr_SetString(PyExc_TypeError, "parameter must be callable");
-	  return NULL;
-	}
-
-      Py_XINCREF(temp);         /* Add a reference to new callback */
-      Py_XDECREF(pneum_callback);  /* Dispose of previous callback */
-      pneum_callback = temp;       /* Remember new callback */
-      cb = wrap_pneum_callback;
-    }
-  Py_BEGIN_ALLOW_THREADS
-  rv = pneum_connect(name, chroot_prefix, cb, rx_qlen);
-  Py_END_ALLOW_THREADS
-  return PyLong_FromLong(rv);
-}
-
-static PyObject *
-wrap_disconnect (PyObject *self, PyObject *args)
-{
-  int rv;
-  Py_BEGIN_ALLOW_THREADS
-  rv = pneum_disconnect();
-  Py_END_ALLOW_THREADS
-  return PyLong_FromLong(rv);
-}
-
-static PyObject *
-wrap_write (PyObject *self, PyObject *args)
-{
-  char *data;
-  int len, rv;
-
-  if (!PyArg_ParseTuple(args, "s#", &data, &len))
-    return NULL;
-
-  Py_BEGIN_ALLOW_THREADS
-  rv = pneum_write(data, len);
-  Py_END_ALLOW_THREADS
-
-  return PyLong_FromLong(rv);
-}
-
-static PyObject *
-wrap_read (PyObject *self, PyObject *args)
-{
-  char *data;
-  int len, rv;
-  unsigned short timeout;
-
-  if (!PyArg_ParseTuple(args, "H", &timeout))
-    return (NULL);
-  Py_BEGIN_ALLOW_THREADS
-  rv = pneum_read(&data, &len, timeout);
-  Py_END_ALLOW_THREADS
-
-  if (rv != 0) { Py_RETURN_NONE; }
-#if PY_VERSION_HEX >= 0x03000000
-  PyObject *ret = Py_BuildValue("y#", data, len);
-#else
-  PyObject *ret = Py_BuildValue("s#", data, len);
-#endif
-  pneum_free(data);
-  if (!ret) { Py_RETURN_NONE; }
-
-  return ret;
-}
-
-static PyObject *
-wrap_msg_table (PyObject *self, PyObject *args)
-{
-  int i = 0, rv = 0;
-  hash_pair_t *hp;
-  uword *h = pneum_msg_table_get_hash();
-  PyObject *ret = PyList_New(pneum_msg_table_size());
-  if (!ret) goto error;
-  hash_foreach_pair (hp, h,
-  ({
-    PyObject *item = PyTuple_New(2);
-    if (!item) goto error;
-    rv = PyTuple_SetItem(item, 0, PyLong_FromLong((u32)hp->value[0]));
-    if (rv) goto error;
-    rv = PyTuple_SetItem(item, 1, PyString_FromString((char *)hp->key));
-    if (rv) goto error;
-    PyList_SetItem(ret, i, item);
-    i++;
-  }));
-
-  return ret;
-
- error:
-  /* TODO: Raise exception */
-  printf("msg_table failed");
-  Py_RETURN_NONE;
-}
-
-static PyObject *
-wrap_suspend (PyObject *self, PyObject *args)
-{
-  Py_BEGIN_ALLOW_THREADS
-  pneum_rx_suspend();
-  Py_END_ALLOW_THREADS
-  Py_RETURN_NONE;
-}
-
-static PyObject *
-wrap_resume (PyObject *self, PyObject *args)
-{
-  Py_BEGIN_ALLOW_THREADS
-  pneum_rx_resume();
-  Py_END_ALLOW_THREADS
-  Py_RETURN_NONE;
-}
-
-static PyMethodDef vpp_api_Methods[] = {
-  {"connect", wrap_connect, METH_VARARGS, "Connect to the VPP API."},
-  {"disconnect", wrap_disconnect, METH_VARARGS, "Disconnect from the VPP API."},
-  {"write", wrap_write, METH_VARARGS, "Write data to the VPP API."},
-  {"read", wrap_read, METH_VARARGS, "Read data from the VPP API."},
-  {"msg_table", wrap_msg_table, METH_VARARGS, "Get API dictionary."},
-  {"suspend", wrap_suspend, METH_VARARGS, "Suspend RX thread."},
-  {"resume", wrap_resume, METH_VARARGS, "Resume RX thread."},
-  {NULL, NULL, 0, NULL}        /* Sentinel */
-};
-
-#if PY_VERSION_HEX >= 0x03000000
-PyMODINIT_FUNC
-PyInit_vpp_api (void)
-#else
-void
-initvpp_api (void)
-#endif
-{
-#if PY_VERSION_HEX >= 0x03000000
-  static struct PyModuleDef vpp_api_module = {
-#if PY_VERSION_HEX >= 0x03020000
-    PyModuleDef_HEAD_INIT,
-#else
-    {
-      PyObject_HEAD_INIT(NULL)
-      NULL, /* m_init */
-      0,    /* m_index */
-      NULL, /* m_copy */
-    },
-#endif
-    (char *) "vpp_api",
-    NULL,
-    -1,
-    vpp_api_Methods,
-    NULL,
-    NULL,
-    NULL,
-    NULL
-  };
-#endif
-
-  /* Ensure threading is initialised */
-  if (!PyEval_ThreadsInitialized()) {
-    PyEval_InitThreads();
-  }
-
-#if PY_VERSION_HEX >= 0x03000000
-  return PyModule_Create(&vpp_api_module);
-#else
-  Py_InitModule((char *) "vpp_api", vpp_api_Methods);
-  return;
-#endif
-}
diff --git a/src/vpp-api/python/vpp_papi/vpp_papi.py b/src/vpp-api/python/vpp_papi/vpp_papi.py
deleted file mode 100644
index 0c40f1710e5..00000000000
--- a/src/vpp-api/python/vpp_papi/vpp_papi.py
+++ /dev/null
@@ -1,599 +0,0 @@
-#!/usr/bin/env python
-#
-# 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.
-#
-
-from __future__ import print_function
-import sys, os, logging, collections, struct, json, threading, glob
-import atexit, Queue
-
-logging.basicConfig(level=logging.DEBUG)
-import vpp_api
-
-def eprint(*args, **kwargs):
-    """Print critical diagnostics to stderr."""
-    print(*args, file=sys.stderr, **kwargs)
-
-def vpp_atexit(self):
-    """Clean up VPP connection on shutdown."""
-    if self.connected:
-        eprint ('Cleaning up VPP on exit')
-        self.disconnect()
-
-
-class Empty(object):
-    pass
-
-
-class FuncWrapper(object):
-    def __init__(self, func):
-        self._func = func
-        self.__name__ = func.__name__
-
-    def __call__(self, **kwargs):
-        return self._func(**kwargs)
-
-
-class VPP():
-    """VPP interface.
-
-    This class provides the APIs to VPP.  The APIs are loaded
-    from provided .api.json files and makes functions accordingly.
-    These functions are documented in the VPP .api files, as they
-    are dynamically created.
-
-    Additionally, VPP can send callback messages; this class
-    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):
-        """Create a VPP API object.
-
-        apifiles is a list of files containing API
-        descriptions that will be loaded - methods will be
-        dynamically created reflecting these APIs.  If not
-        provided this will load the API files from VPP's
-        default install location.
-        """
-        self.messages = {}
-        self.id_names = []
-        self.id_msgdef = []
-        self.buffersize = 10000
-        self.connected = False
-        self.header = struct.Struct('>HI')
-        self.apifiles = []
-        self.event_callback = None
-        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.daemon = True
-            self.event_thread.start()
-
-        if not apifiles:
-            # Pick up API definitions from default directory
-            apifiles = glob.glob('/usr/share/vpp/api/*.api.json')
-
-        for file in apifiles:
-            with open(file) as apidef_file:
-                api = json.load(apidef_file)
-                for t in api['types']:
-                    self.add_type(t[0], t[1:])
-
-                for m in api['messages']:
-                    self.add_message(m[0], m[1:])
-	self.apifiles = apifiles
-
-        # Basic sanity check
-        if len(self.messages) == 0 and not testmode:
-            raise ValueError(1, 'Missing JSON message definitions')
-
-        # Make sure we allow VPP to clean up the message rings.
-        atexit.register(vpp_atexit, self)
-
-    class ContextId(object):
-        """Thread-safe provider of unique context IDs."""
-        def __init__(self):
-            self.context = 0
-	    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
-    get_context = ContextId()
-
-    def status(self):
-        """Debug function: report current VPP API status to stdout."""
-        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):
-        """Create a packing structure for a message."""
-        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 > 0 and t == 'u8':
-                    # Fixed byte array
-                    return struct.Struct('>' + str(e) + 's')
-                if e > 0:
-                    # Fixed array of base type
-                    return [e, struct.Struct('>' + base_types[t])]
-                elif e == 0:
-                    # Old style variable array
-                    return [-1, 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 > 0 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))]
-            elif e == 0:
-                # Old style VLA
-                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)
-            )
-
-        raise ValueError(1, 'Invalid message type: ' + t)
-
-    def __struct_type(self, encode, msgdef, buf, offset, kwargs):
-        """Get a message packer or unpacker."""
-        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 in kwargs:
-            if k not in msgdef['args']:
-                raise ValueError(1, 'Invalid field-name in message call ' + k)
-
-        for k,v in msgdef['args'].iteritems():
-            off += size
-            if k in kwargs:
-                if type(v) is list:
-                    if callable(v[1]):
-                        e = kwargs[v[0]] if v[0] in kwargs else 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 if not type(v) is list else 0
-
-        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 = res[v[2]]
-                    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:
-                    if type(v[0]) is int:
-                        size = len(buf) - off
-                    else:
-                        size = res[v[2]]
-                    res.append(buf[off:off + size])
-                else:
-                    e = v[0] if type(v[0]) is int else res[v[2]]
-                    if e == -1:
-                        e = (len(buf) - off) / v[1].size
-                    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()
-        argtypes = collections.OrderedDict()
-        fields = []
-        msg = {}
-        for i, f in enumerate(msgdef):
-            if type(f) is dict and 'crc' in f:
-                msg['crc'] = f['crc']
-                continue
-            field_type = f[0]
-            field_name = f[1]
-            if len(f) == 3 and f[2] == 0 and i != len(msgdef) - 2:
-                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)
-            fields.append(field_name)
-        msg['return_tuple'] = collections.namedtuple(name, fields,
-                                                     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)
-
-    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))
-        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()])
-        return f
-
-    @property
-    def api(self):
-        if not hasattr(self, "_api"):
-            raise Exception("Not connected, api definitions not available")
-        return self._api
-
-    def _register_functions(self, async=False):
-        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 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
-                f = self.make_function(name, i, msgdef, multipart, async)
-                setattr(self._api, name, FuncWrapper(f))
-
-                # old API stuff starts here - will be removed in 17.07
-                if hasattr(self, name):
-                    raise NameError(
-                        3, "Conflicting name in JSON definition: `%s'" % name)
-                setattr(self, name, f)
-                # old API stuff ends here
-
-    def _write (self, buf):
-        """Send a binary-packed message to VPP."""
-        if not self.connected:
-            raise IOError(1, 'Not connected')
-        return vpp_api.write(str(buf))
-
-    def _read (self):
-        if not self.connected:
-            raise IOError(1, 'Not connected')
-
-        return vpp_api.read(self.read_timeout)
-
-    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_internal(self, name, msg_handler, chroot_prefix, rx_qlen, async):
-	rv = vpp_api.connect(name, msg_handler, chroot_prefix, rx_qlen)
-        if rv != 0:
-            raise IOError(2, 'Connect failed')
-        self.connected = True
-
-        self._load_dictionary()
-        self._register_functions(async=async)
-
-        # Initialise control ping
-        self.control_ping_index = self.vpp_dictionary['control_ping']['id']
-        self.control_ping_msgdef = self.messages['control_ping']
-
-    def connect(self, name, chroot_prefix = None, async = False, rx_qlen = 32):
-        """Attach to VPP.
-
-        name - the name of the client.
-        chroot_prefix - if VPP is chroot'ed, the prefix of the jail
-        async - if true, messages are sent without waiting for a reply
-        rx_qlen - the length of the VPP message receive queue between
-        client and server.
-        """
-        msg_handler = self.msg_handler_sync if not async \
-                      else self.msg_handler_async
-        return self.connect_internal(name, msg_handler, chroot_prefix, rx_qlen,
-                                     async)
-
-    def connect_sync (self, name, chroot_prefix = None, rx_qlen = 32):
-        """Attach to VPP in synchronous mode. Application must poll for events.
-
-        name - the name of the client.
-        chroot_prefix - if VPP is chroot'ed, the prefix of the jail
-        rx_qlen - the length of the VPP message receive queue between
-        client and server.
-        """
-
-        return self.connect_internal(name, None, chroot_prefix, rx_qlen,
-                                     async=False)
-
-    def disconnect(self):
-        """Detach from VPP."""
-        rv = vpp_api.disconnect()
-        self.connected = False
-        return rv
-
-    def msg_handler_sync(self, msg):
-        """Process an incoming message from VPP in sync mode.
-
-        The message may be a reply or it may be an async notification.
-        """
-        r = self.decode_incoming_msg(msg)
-        if r is None:
-            return
-
-        # If we have a context, then use the context to find any
-        # request waiting for a reply
-        context = 0
-        if hasattr(r, 'context') and r.context > 0:
-            context = r.context
-
-        msgname = type(r).__name__
-
-        if context == 0:
-            # No context -> async notification that we feed to the callback
-            self.message_queue.put_nowait(r)
-        else:
-            raise IOError(2, 'RPC reply message received in event handler')
-
-    def decode_incoming_msg(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
-
-        #
-        # Decode message and returns a tuple.
-        #
-        msgdef = self.id_msgdef[i]
-        if not msgdef:
-            raise IOError(2, 'Reply message undefined')
-
-        r = self.decode(msgdef, msg)
-
-        return r
-
-    def msg_handler_async(self, msg):
-        """Process a message from VPP in async mode.
-
-        In async mode, all messages are returned to the callback.
-        """
-        r = self.decode_incoming_msg(msg)
-        if r is None:
-            return
-
-        msgname = type(r).__name__
-
-	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,
-                             context=context)
-
-    def _call_vpp(self, i, msgdef, multipart, **kwargs):
-        """Given a message, send the message and await a reply.
-
-        msgdef - the message packing definition
-        i - the message type index
-        multipart - True if the message returns multiple
-        messages in return.
-        context - context number - chosen at random if not
-        supplied.
-        The remainder of the kwargs are the arguments to the API call.
-
-        The return value is the message or message array containing
-        the response.  It will raise an IOError exception if there was
-        no response within the timeout window.
-        """
-
-        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)
-
-        vpp_api.suspend()
-        self._write(b)
-
-        if multipart:
-            # Send a ping after the request - we use its response
-            # to detect that we have seen all results.
-            self._control_ping(context)
-
-        # Block until we get a reply.
-        rl = []
-        while (True):
-            msg = self._read()
-            if not msg:
-                print('PNEUM ERROR: OH MY GOD')
-                raise IOError(2, 'PNEUM 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:
-                self.message_queue.put_nowait(r)
-                continue
-
-            if not multipart:
-                rl = r
-                break
-            if msgname == 'control_ping_reply':
-                break
-
-            rl.append(r)
-
-        vpp_api.resume()
-
-        return rl
-
-    def _call_vpp_async(self, i, msgdef, **kwargs):
-        """Given a message, send the message and await a reply.
-
-        msgdef - the message packing definition
-        i - the message type index
-        context - context number - chosen at random if not
-        supplied.
-        The remainder of the kwargs are the arguments to the API call.
-        """
-        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._write(b)
-
-    def register_event_callback(self, callback):
-        """Register a callback for async messages.
-
-        This will be called for async notifications in sync mode,
-        and all messages in async mode.  In sync mode, replies to
-        requests will not come here.
-
-        callback is a fn(msg_type_name, msg_type) that will be
-        called when a message comes in.  While this function is
-        executing, note that (a) you are in a background thread and
-        may wish to use threading.Lock to protect your datastructures,
-        and (b) message processing from VPP will stop (so if you take
-        a long while about it you may provoke reply timeouts or cause
-        VPP to fill the RX buffer).  Passing None will disable the
-        callback.
-        """
-        self.event_callback = callback
-
-    def thread_msg_handler(self):
-        """Python thread calling the user registerd message handler.
-
-        This is to emulate the old style event callback scheme. Modern
-        clients should provide their own thread to poll the event
-        queue.
-        """
-        while True:
-            r = self.message_queue.get()
-            msgname = type(r).__name__
-	    if self.event_callback:
-	        self.event_callback(msgname, r)