aboutsummaryrefslogtreecommitdiffstats
path: root/vpp-api/python/pneum/api-gen.py
blob: fcf293ecbc0ad21a1bfb0d9eeb1c8879d440a53e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
#!/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.
#

import argparse, sys, os, importlib, pprint

parser = argparse.ArgumentParser(description='VPP Python API generator')
parser.add_argument('-i', action="store", dest="inputfile")
parser.add_argument('-c', '--cfile', action="store")
args = parser.parse_args()

sys.path.append(".")

inputfile = args.inputfile.replace('.py', '')
cfg = importlib.import_module(inputfile, package=None)

# https://docs.python.org/3/library/struct.html
format_struct = {'u8': 'B',
                 'u16' : 'H',
                 'u32' : 'I',
                 'i32' : 'i',
                 'u64' : 'Q',
                 'f64' : 'd',
                 'vl_api_ip4_fib_counter_t' : 'IBQQ',
                 'vl_api_ip6_fib_counter_t' : 'QQBQQ',
                 'vl_api_lisp_adjacency_t' : 'B' * 35,
                 };
#
# NB: If new types are introduced in vpe.api, these must be updated.
#
type_size = {'u8':   1,
             'u16' : 2,
             'u32' : 4,
             'i32' : 4,
             'u64' : 8,
             'f64' : 8,
             'vl_api_ip4_fib_counter_t' : 21,
             'vl_api_ip6_fib_counter_t' : 33,
             'vl_api_lisp_adjacency_t' : 35,
};

def get_args(t):
    argslist = []
    for i in t:
        if i[1][0] == '_':
            argslist.append(i[1][1:])
        else:
            argslist.append(i[1])

    return argslist

def get_pack(t):
    zeroarray = False
    bytecount = 0
    pack = '>'
    tup = u''
    j = -1
    for i in t:
        j += 1
        if len(i) is 3 or len(i) is 4:  # TODO: add support for variable length arrays (VPP-162)
            size = type_size[i[0]]
            bytecount += size * int(i[2])
            # Check if we have a zero length array
            if i[2] == '0':
                tup += 'msg[' + str(bytecount) + ':],'
                zeroarray = True
                continue
            if size == 1:
                n = i[2] * size
                pack += str(n) + 's'
                tup += 'tr[' + str(j) + '],'
                continue
            pack += format_struct[i[0]] * int(i[2])
            tup += 'tr[' + str(j) + ':' + str(j + int(i[2])) + '],'
            j += int(i[2]) - 1
        else:
            bytecount += type_size[i[0]]
            pack += format_struct[i[0]]
            tup += 'tr[' + str(j) + '],'
    return pack, bytecount, tup, zeroarray

def get_reply_func(f):
    if f['name']+'_reply' in func_name:
        return func_name[f['name']+'_reply']
    if f['name'].find('_dump') > 0:
        r = f['name'].replace('_dump','_details')
        if r in func_name:
            return func_name[r]
    return None

def get_enums():
    # Read enums from stdin
    enums_by_name = {}
    enums_by_index = {}
    i = 1
    for l in sys.stdin:
        l = l.replace(',\n','')
        print l, "=", i

        l = l.replace('VL_API_','').lower()
        enums_by_name[l] = i
        enums_by_index[i] = l

        i += 1
    return enums_by_name, enums_by_index

def get_definitions():
    # Pass 1
    func_list = []
    func_name = {}
    i = 1
    for a in cfg.messages:
        pack, packlen, tup, zeroarray = get_pack(a[1:])
        func_name[a[0]] = dict([('name', a[0]), ('pack', pack), ('packlen', packlen), ('tup', tup), ('args', get_args(a[1:])),
                                ('zeroarray', zeroarray)])
        func_list.append(func_name[a[0]])  # Indexed by name
    return func_list, func_name

def generate_c_macros(func_list, enums_by_name):
    file = open(args.cfile, 'w+')
    print >>file, "#define foreach_api_msg \\"
    for f in func_list:
        if not f['name'] in enums_by_name:
            continue
        print >>file, "_(" + f['name'].upper() + ", " + f['name'] + ") \\"
    print >>file, '''
void pneum_set_handlers(void) {
#define _(N,n)							\\
  api_func_table[VL_API_##N] = sizeof(vl_api_##n##_t);
  foreach_api_msg;
#undef _
}
    '''

#
# Print array with a hash of 'decode' and 'multipart'
# Simplify to do only decode for now. And deduce multipart from _dump?
#
def decode_function_print(name, args, pack, packlen, tup):

    print(u'def ' + name + u'_decode(msg):')
    print(u"    n = namedtuple('" + name + "', '" + ', '.join(args) + "')" +
    '''
    if not n:
        return None
    ''')
    print(u"    tr = unpack('" + pack + "', msg[:" + str(packlen) + "])")
    print(u"    r = n._make((" + tup + "))" +
    '''
    if not r:
        return None
    return r
    ''')

def function_print(name, id, args, pack, multipart, zeroarray):
    if len(args) < 4:
        print "def", name + "(async = False):"
    else:
        print "def", name + "(" + ', '.join(args[3:]) + ", async = False):"
    print "    global waiting_for_reply"
    print "    context = get_context(" + id + ")"

    print '''
    results[context] = {}
    results[context]['e'] = threading.Event()
    results[context]['e'].clear()
    results[context]['r'] = []
    waiting_for_reply = True
    '''
    if multipart == True:
        print "    results[context]['m'] = True"

    if zeroarray == True:
        print "    vpp_api.write(pack('" + pack + "', " + id + ", 0, context, " + ', '.join(args[3:-1]) + ") + " + args[-1] + ")"
    else:
        print "    vpp_api.write(pack('" + pack + "', " + id + ", 0, context, " + ', '.join(args[3:]) + "))"

    if multipart == True:
        print "    vpp_api.write(pack('>HII', VL_API_CONTROL_PING, 0, context))"

    print '''
    if not async:
        results[context]['e'].wait(5)
        return results[context]['r']
    return context
    '''

#
# Should dynamically create size
#
def api_table_print (name, msg_id):
    f = name + '_decode'
    print('api_func_table[' + msg_id + '] = ' + f)

#
# Generate the main Python file
#

print '''

#
# AUTO-GENERATED FILE. PLEASE DO NOT EDIT.
#
import sys, time, threading, signal, os, logging
from struct import *
from collections import namedtuple

#
# Import C API shared object
#
import vpp_api

context = 0
results = {}
waiting_for_reply = False

#
# XXX: Make this return a unique number
#
def get_context(id):
    global context
    context += 1
    return context

def msg_handler(msg):
    global result, context, event_callback, waiting_for_reply
    if not msg:
        logging.warning('vpp_api.read failed')
        return

    id = unpack('>H', msg[0:2])
    logging.debug('Received message', id[0])
    if id[0] == VL_API_RX_THREAD_EXIT:
        logging.info("We got told to leave")
        return;

    #
    # Decode message and returns a tuple.
    #
    logging.debug('api_func', api_func_table[id[0]])
    r = api_func_table[id[0]](msg)
    if not r:
        logging.warning('Message decode failed', id[0])
        return

    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?
    #
    logging.debug('R:', context, r, waiting_for_reply)
    if waiting_for_reply == False:
        event_callback(r)
        return

    #
    # Collect results until control ping
    #
    if id[0] == VL_API_CONTROL_PING_REPLY:
        results[context]['e'].set()
        waiting_for_reply = False
        return
    if not context in results:
        logging.warning('Not expecting results for this context', context)
        return
    if 'm' in results[context]:
        results[context]['r'].append(r)
        return

    results[context]['r'] = r
    results[context]['e'].set()
    waiting_for_reply = False

def connect(name):
    signal.alarm(3) # 3 second
    rv = vpp_api.connect(name, msg_handler)
    signal.alarm(0)
    logging.info("Connect:", rv)
    return rv

def disconnect():
    rv = vpp_api.disconnect()
    logging.info("Disconnected")
    return rv

def register_event_callback(callback):
    global event_callback
    event_callback = callback
'''

enums_by_name, enums_by_index = get_enums()
func_list, func_name = get_definitions()

#
# Not needed with the new msg_size field.
# generate_c_macros(func_list, enums_by_name)
#

pp = pprint.PrettyPrinter(indent=4)
#print 'enums_by_index =', pp.pprint(enums_by_index)
#print 'func_name =', pp.pprint(func_name)

# Pass 2

#
# 1) The VPE API lacks a clear definition of what messages are reply messages
# 2) Length is missing, and has to be pre-known or in case of variable sized ones calculated per message type
#
for f in func_list:
    #if f['name'].find('_reply') > 0 or f['name'].find('_details') > 0:
    decode_function_print(f['name'], f['args'], f['pack'], f['packlen'], f['tup'])

    #r = get_reply_func(f)
    #if not r:
    #    #
    #    # XXX: Functions here are not taken care of. E.g. events
    #    #
    #    print('Missing function', f)
    #    continue

    if f['name'].find('_dump') > 0:
        f['multipart'] = True
    else:
        f['multipart'] = False
    msg_id_in = 'VL_API_' + f['name'].upper()
    function_print(f['name'], msg_id_in, f['args'], f['pack'], f['multipart'], f['zeroarray'])


print "api_func_table = [0] * 10000"
for f in func_list:
    #    if f['name'].find('_reply') > 0 or f['name'].find('_details') > 0:
    msg_id_in = 'VL_API_' + f['name'].upper()
    api_table_print(f['name'], msg_id_in)