aboutsummaryrefslogtreecommitdiffhomepage
path: root/tools/codegen/core/gen_static_metadata.py
blob: f705a9bd41c3c5d52a4114e43e885fd40f95eb2b (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
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
#!/usr/bin/env python2.7

# Copyright 2015 gRPC authors.
#
# 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 hashlib
import itertools
import collections
import os
import sys
import subprocess
import re
import perfection

# Configuration: a list of either strings or 2-tuples of strings.
# A single string represents a static grpc_mdstr.
# A 2-tuple represents a static grpc_mdelem (and appropriate grpc_mdstrs will
# also be created).
# The list of 2-tuples must begin with the static hpack table elements as
# defined by RFC 7541 and be in the same order because of an hpack encoding
# performance optimization that relies on this. If you want to change this, then
# you must change the implementation of the encoding optimization as well.

CONFIG = [
    # metadata strings
    'host',
    'grpc-timeout',
    'grpc-internal-encoding-request',
    'grpc-internal-stream-encoding-request',
    'grpc-payload-bin',
    ':path',
    'grpc-encoding',
    'grpc-accept-encoding',
    'user-agent',
    ':authority',
    'grpc-message',
    'grpc-status',
    'grpc-server-stats-bin',
    'grpc-tags-bin',
    'grpc-trace-bin',
    'grpc-previous-rpc-attempts',
    'grpc-retry-pushback-ms',
    '1',
    '2',
    '3',
    '4',
    '',
    # channel arg keys
    'grpc.wait_for_ready',
    'grpc.timeout',
    'grpc.max_request_message_bytes',
    'grpc.max_response_message_bytes',
    # well known method names
    '/grpc.lb.v1.LoadBalancer/BalanceLoad',
    # compression algorithm names
    'deflate',
    'gzip',
    'stream/gzip',
    # metadata elements
    # begin hpack static elements
    (':authority', ''),
    (':method', 'GET'),
    (':method', 'POST'),
    (':path', '/'),
    (':path', '/index.html'),
    (':scheme', 'http'),
    (':scheme', 'https'),
    (':status', '200'),
    (':status', '204'),
    (':status', '206'),
    (':status', '304'),
    (':status', '400'),
    (':status', '404'),
    (':status', '500'),
    ('accept-charset', ''),
    ('accept-encoding', 'gzip, deflate'),
    ('accept-language', ''),
    ('accept-ranges', ''),
    ('accept', ''),
    ('access-control-allow-origin', ''),
    ('age', ''),
    ('allow', ''),
    ('authorization', ''),
    ('cache-control', ''),
    ('content-disposition', ''),
    ('content-encoding', ''),
    ('content-language', ''),
    ('content-length', ''),
    ('content-location', ''),
    ('content-range', ''),
    ('content-type', ''),
    ('cookie', ''),
    ('date', ''),
    ('etag', ''),
    ('expect', ''),
    ('expires', ''),
    ('from', ''),
    ('host', ''),
    ('if-match', ''),
    ('if-modified-since', ''),
    ('if-none-match', ''),
    ('if-range', ''),
    ('if-unmodified-since', ''),
    ('last-modified', ''),
    ('link', ''),
    ('location', ''),
    ('max-forwards', ''),
    ('proxy-authenticate', ''),
    ('proxy-authorization', ''),
    ('range', ''),
    ('referer', ''),
    ('refresh', ''),
    ('retry-after', ''),
    ('server', ''),
    ('set-cookie', ''),
    ('strict-transport-security', ''),
    ('transfer-encoding', ''),
    ('user-agent', ''),
    ('vary', ''),
    ('via', ''),
    ('www-authenticate', ''),
    # end hpack static elements
    ('grpc-status', '0'),
    ('grpc-status', '1'),
    ('grpc-status', '2'),
    ('grpc-encoding', 'identity'),
    ('grpc-encoding', 'gzip'),
    ('grpc-encoding', 'deflate'),
    ('te', 'trailers'),
    ('content-type', 'application/grpc'),
    (':scheme', 'grpc'),
    (':method', 'PUT'),
    ('accept-encoding', ''),
    ('content-encoding', 'identity'),
    ('content-encoding', 'gzip'),
    ('lb-token', ''),
    ('lb-cost-bin', ''),
]

# All entries here are ignored when counting non-default initial metadata that
# prevents the chttp2 server from sending a Trailers-Only response.
METADATA_BATCH_CALLOUTS = [
    # (name)
    (':path'),
    (':method'),
    (':status'),
    (':authority'),
    (':scheme'),
    ('te'),
    ('grpc-message'),
    ('grpc-status'),
    ('grpc-payload-bin'),
    ('grpc-encoding'),
    ('grpc-accept-encoding'),
    ('grpc-server-stats-bin'),
    ('grpc-tags-bin'),
    ('grpc-trace-bin'),
    ('content-type'),
    ('content-encoding'),
    ('accept-encoding'),
    ('grpc-internal-encoding-request'),
    ('grpc-internal-stream-encoding-request'),
    ('user-agent'),
    ('host'),
    ('lb-token'),
    ('grpc-previous-rpc-attempts'),
    ('grpc-retry-pushback-ms'),
]

COMPRESSION_ALGORITHMS = [
    'identity',
    'deflate',
    'gzip',
]

STREAM_COMPRESSION_ALGORITHMS = [
    'identity',
    'gzip',
]


# utility: mangle the name of a config
def mangle(elem, name=None):
    xl = {
        '-': '_',
        ':': '',
        '/': 'slash',
        '.': 'dot',
        ',': 'comma',
        ' ': '_',
    }

    def m0(x):
        if not x:
            return 'empty'
        r = ''
        for c in x:
            put = xl.get(c, c.lower())
            if not put:
                continue
            last_is_underscore = r[-1] == '_' if r else True
            if last_is_underscore and put == '_':
                continue
            elif len(put) > 1:
                if not last_is_underscore:
                    r += '_'
                r += put
                r += '_'
            else:
                r += put
        if r[-1] == '_':
            r = r[:-1]
        return r

    def n(default, name=name):
        if name is None:
            return 'grpc_%s_' % default
        if name == '':
            return ''
        return 'grpc_%s_' % name

    if isinstance(elem, tuple):
        return '%s%s_%s' % (n('mdelem'), m0(elem[0]), m0(elem[1]))
    else:
        return '%s%s' % (n('mdstr'), m0(elem))


# utility: generate some hash value for a string
def fake_hash(elem):
    return hashlib.md5(elem).hexdigest()[0:8]


# utility: print a big comment block into a set of files
def put_banner(files, banner):
    for f in files:
        print >> f, '/*'
        for line in banner:
            print >> f, ' * %s' % line
        print >> f, ' */'
        print >> f


# build a list of all the strings we need
all_strs = list()
all_elems = list()
static_userdata = {}
# put metadata batch callouts first, to make the check of if a static metadata
# string is a callout trivial
for elem in METADATA_BATCH_CALLOUTS:
    if elem not in all_strs:
        all_strs.append(elem)
for elem in CONFIG:
    if isinstance(elem, tuple):
        if elem[0] not in all_strs:
            all_strs.append(elem[0])
        if elem[1] not in all_strs:
            all_strs.append(elem[1])
        if elem not in all_elems:
            all_elems.append(elem)
    else:
        if elem not in all_strs:
            all_strs.append(elem)
compression_elems = []
for mask in range(1, 1 << len(COMPRESSION_ALGORITHMS)):
    val = ','.join(COMPRESSION_ALGORITHMS[alg]
                   for alg in range(0, len(COMPRESSION_ALGORITHMS))
                   if (1 << alg) & mask)
    elem = ('grpc-accept-encoding', val)
    if val not in all_strs:
        all_strs.append(val)
    if elem not in all_elems:
        all_elems.append(elem)
    compression_elems.append(elem)
    static_userdata[elem] = 1 + (mask | 1)
stream_compression_elems = []
for mask in range(1, 1 << len(STREAM_COMPRESSION_ALGORITHMS)):
    val = ','.join(STREAM_COMPRESSION_ALGORITHMS[alg]
                   for alg in range(0, len(STREAM_COMPRESSION_ALGORITHMS))
                   if (1 << alg) & mask)
    elem = ('accept-encoding', val)
    if val not in all_strs:
        all_strs.append(val)
    if elem not in all_elems:
        all_elems.append(elem)
    stream_compression_elems.append(elem)
    static_userdata[elem] = 1 + (mask | 1)

# output configuration
args = sys.argv[1:]
H = None
C = None
D = None
if args:
    if 'header' in args:
        H = sys.stdout
    else:
        H = open('/dev/null', 'w')
    if 'source' in args:
        C = sys.stdout
    else:
        C = open('/dev/null', 'w')
    if 'dictionary' in args:
        D = sys.stdout
    else:
        D = open('/dev/null', 'w')
else:
    H = open(
        os.path.join(
            os.path.dirname(sys.argv[0]),
            '../../../src/core/lib/transport/static_metadata.h'), 'w')
    C = open(
        os.path.join(
            os.path.dirname(sys.argv[0]),
            '../../../src/core/lib/transport/static_metadata.cc'), 'w')
    D = open(
        os.path.join(
            os.path.dirname(sys.argv[0]),
            '../../../test/core/end2end/fuzzers/hpack.dictionary'), 'w')

# copy-paste copyright notice from this file
with open(sys.argv[0]) as my_source:
    copyright = []
    for line in my_source:
        if line[0] != '#':
            break
    for line in my_source:
        if line[0] == '#':
            copyright.append(line)
            break
    for line in my_source:
        if line[0] != '#':
            break
        copyright.append(line)
    put_banner([H, C], [line[2:].rstrip() for line in copyright])

hex_bytes = [ord(c) for c in 'abcdefABCDEF0123456789']


def esc_dict(line):
    out = "\""
    for c in line:
        if 32 <= c < 127:
            if c != ord('"'):
                out += chr(c)
            else:
                out += "\\\""
        else:
            out += '\\x%02X' % c
    return out + "\""


put_banner([H, C], """WARNING: Auto-generated code.

To make changes to this file, change
tools/codegen/core/gen_static_metadata.py, and then re-run it.

See metadata.h for an explanation of the interface here, and metadata.cc for
an explanation of what's going on.
""".splitlines())

print >> H, '#ifndef GRPC_CORE_LIB_TRANSPORT_STATIC_METADATA_H'
print >> H, '#define GRPC_CORE_LIB_TRANSPORT_STATIC_METADATA_H'
print >> H
print >> H, '#include <grpc/support/port_platform.h>'
print >> H
print >> H, '#include "src/core/lib/transport/metadata.h"'
print >> H
print >> C, '#include <grpc/support/port_platform.h>'
print >> C
print >> C, '#include "src/core/lib/transport/static_metadata.h"'
print >> C
print >> C, '#include "src/core/lib/slice/slice_internal.h"'
print >> C

str_ofs = 0
id2strofs = {}
for i, elem in enumerate(all_strs):
    id2strofs[i] = str_ofs
    str_ofs += len(elem)


def slice_def(i):
    return ('{&grpc_static_metadata_refcounts[%d],'
            ' {{g_bytes+%d, %d}}}') % (i, id2strofs[i], len(all_strs[i]))


# validate configuration
for elem in METADATA_BATCH_CALLOUTS:
    assert elem in all_strs

print >> H, '#define GRPC_STATIC_MDSTR_COUNT %d' % len(all_strs)
print >> H, ('extern const grpc_slice '
             'grpc_static_slice_table[GRPC_STATIC_MDSTR_COUNT];')
for i, elem in enumerate(all_strs):
    print >> H, '/* "%s" */' % elem
    print >> H, '#define %s (grpc_static_slice_table[%d])' % (
        mangle(elem).upper(), i)
print >> H
print >> C, 'static uint8_t g_bytes[] = {%s};' % (','.join(
    '%d' % ord(c) for c in ''.join(all_strs)))
print >> C
print >> C, 'static void static_ref(void *unused) {}'
print >> C, 'static void static_unref(void *unused) {}'
print >> C, ('static const grpc_slice_refcount_vtable static_sub_vtable = '
             '{static_ref, static_unref, grpc_slice_default_eq_impl, '
             'grpc_slice_default_hash_impl};')
print >> H, ('extern const grpc_slice_refcount_vtable '
             'grpc_static_metadata_vtable;')
print >> C, ('const grpc_slice_refcount_vtable grpc_static_metadata_vtable = '
             '{static_ref, static_unref, grpc_static_slice_eq, '
             'grpc_static_slice_hash};')
print >> C, ('static grpc_slice_refcount static_sub_refcnt = '
             '{&static_sub_vtable, &static_sub_refcnt};')
print >> H, ('extern grpc_slice_refcount '
             'grpc_static_metadata_refcounts[GRPC_STATIC_MDSTR_COUNT];')
print >> C, ('grpc_slice_refcount '
             'grpc_static_metadata_refcounts[GRPC_STATIC_MDSTR_COUNT] = {')
for i, elem in enumerate(all_strs):
    print >> C, '  {&grpc_static_metadata_vtable, &static_sub_refcnt},'
print >> C, '};'
print >> C
print >> H, '#define GRPC_IS_STATIC_METADATA_STRING(slice) \\'
print >> H, ('  ((slice).refcount != NULL && (slice).refcount->vtable == '
             '&grpc_static_metadata_vtable)')
print >> H
print >> C, ('const grpc_slice grpc_static_slice_table[GRPC_STATIC_MDSTR_COUNT]'
             ' = {')
for i, elem in enumerate(all_strs):
    print >> C, slice_def(i) + ','
print >> C, '};'
print >> C
print >> H, '#define GRPC_STATIC_METADATA_INDEX(static_slice) \\'
print >> H, ('  ((int)((static_slice).refcount - '
             'grpc_static_metadata_refcounts))')
print >> H

print >> D, '# hpack fuzzing dictionary'
for i, elem in enumerate(all_strs):
    print >> D, '%s' % (esc_dict([len(elem)] + [ord(c) for c in elem]))
for i, elem in enumerate(all_elems):
    print >> D, '%s' % (esc_dict([0, len(elem[0])] + [ord(c) for c in elem[0]] +
                                 [len(elem[1])] + [ord(c) for c in elem[1]]))

print >> H, '#define GRPC_STATIC_MDELEM_COUNT %d' % len(all_elems)
print >> H, ('extern grpc_mdelem_data '
             'grpc_static_mdelem_table[GRPC_STATIC_MDELEM_COUNT];')
print >> H, ('extern uintptr_t '
             'grpc_static_mdelem_user_data[GRPC_STATIC_MDELEM_COUNT];')
for i, elem in enumerate(all_elems):
    print >> H, '/* "%s": "%s" */' % elem
    print >> H, ('#define %s (GRPC_MAKE_MDELEM(&grpc_static_mdelem_table[%d], '
                 'GRPC_MDELEM_STORAGE_STATIC))') % (mangle(elem).upper(), i)
print >> H

print >> C, ('uintptr_t grpc_static_mdelem_user_data[GRPC_STATIC_MDELEM_COUNT] '
             '= {')
print >> C, '  %s' % ','.join(
    '%d' % static_userdata.get(elem, 0) for elem in all_elems)
print >> C, '};'
print >> C


def str_idx(s):
    for i, s2 in enumerate(all_strs):
        if s == s2:
            return i


def md_idx(m):
    for i, m2 in enumerate(all_elems):
        if m == m2:
            return i


def offset_trials(mink):
    yield 0
    for i in range(1, 100):
        for mul in [-1, 1]:
            yield mul * i


def perfect_hash(keys, name):
    p = perfection.hash_parameters(keys)

    def f(i, p=p):
        i += p.offset
        x = i % p.t
        y = i / p.t
        return x + p.r[y]

    return {
        'PHASHRANGE': p.t - 1 + max(p.r),
        'PHASHNKEYS': len(p.slots),
        'pyfunc': f,
        'code': """
static const int8_t %(name)s_r[] = {%(r)s};
static uint32_t %(name)s_phash(uint32_t i) {
  i %(offset_sign)s= %(offset)d;
  uint32_t x = i %% %(t)d;
  uint32_t y = i / %(t)d;
  uint32_t h = x;
  if (y < GPR_ARRAY_SIZE(%(name)s_r)) {
    uint32_t delta = (uint32_t)%(name)s_r[y];
    h += delta;
  }
  return h;
}
    """ % {
            'name': name,
            'r': ','.join('%d' % (r if r is not None else 0) for r in p.r),
            't': p.t,
            'offset': abs(p.offset),
            'offset_sign': '+' if p.offset > 0 else '-'
        }
    }


elem_keys = [
    str_idx(elem[0]) * len(all_strs) + str_idx(elem[1]) for elem in all_elems
]
elem_hash = perfect_hash(elem_keys, 'elems')
print >> C, elem_hash['code']

keys = [0] * int(elem_hash['PHASHRANGE'])
idxs = [255] * int(elem_hash['PHASHNKEYS'])
for i, k in enumerate(elem_keys):
    h = elem_hash['pyfunc'](k)
    assert keys[h] == 0
    keys[h] = k
    idxs[h] = i
print >> C, 'static const uint16_t elem_keys[] = {%s};' % ','.join(
    '%d' % k for k in keys)
print >> C, 'static const uint8_t elem_idxs[] = {%s};' % ','.join(
    '%d' % i for i in idxs)
print >> C

print >> H, 'grpc_mdelem grpc_static_mdelem_for_static_strings(int a, int b);'
print >> C, 'grpc_mdelem grpc_static_mdelem_for_static_strings(int a, int b) {'
print >> C, '  if (a == -1 || b == -1) return GRPC_MDNULL;'
print >> C, '  uint32_t k = (uint32_t)(a * %d + b);' % len(all_strs)
print >> C, '  uint32_t h = elems_phash(k);'
print >> C, '  return h < GPR_ARRAY_SIZE(elem_keys) && elem_keys[h] == k && elem_idxs[h] != 255 ? GRPC_MAKE_MDELEM(&grpc_static_mdelem_table[elem_idxs[h]], GRPC_MDELEM_STORAGE_STATIC) : GRPC_MDNULL;'
print >> C, '}'
print >> C

print >> C, 'grpc_mdelem_data grpc_static_mdelem_table[GRPC_STATIC_MDELEM_COUNT] = {'
for a, b in all_elems:
    print >> C, '{%s,%s},' % (slice_def(str_idx(a)), slice_def(str_idx(b)))
print >> C, '};'

print >> H, 'typedef enum {'
for elem in METADATA_BATCH_CALLOUTS:
    print >> H, '  %s,' % mangle(elem, 'batch').upper()
print >> H, '  GRPC_BATCH_CALLOUTS_COUNT'
print >> H, '} grpc_metadata_batch_callouts_index;'
print >> H
print >> H, 'typedef union {'
print >> H, '  struct grpc_linked_mdelem *array[GRPC_BATCH_CALLOUTS_COUNT];'
print >> H, '  struct {'
for elem in METADATA_BATCH_CALLOUTS:
    print >> H, '  struct grpc_linked_mdelem *%s;' % mangle(elem, '').lower()
print >> H, '  } named;'
print >> H, '} grpc_metadata_batch_callouts;'
print >> H
print >> H, '#define GRPC_BATCH_INDEX_OF(slice) \\'
print >> H, '  (GRPC_IS_STATIC_METADATA_STRING((slice)) ? (grpc_metadata_batch_callouts_index)GPR_CLAMP(GRPC_STATIC_METADATA_INDEX((slice)), 0, GRPC_BATCH_CALLOUTS_COUNT) : GRPC_BATCH_CALLOUTS_COUNT)'
print >> H

print >> H, 'extern const uint8_t grpc_static_accept_encoding_metadata[%d];' % (
    1 << len(COMPRESSION_ALGORITHMS))
print >> C, 'const uint8_t grpc_static_accept_encoding_metadata[%d] = {' % (
    1 << len(COMPRESSION_ALGORITHMS))
print >> C, '0,%s' % ','.join('%d' % md_idx(elem) for elem in compression_elems)
print >> C, '};'
print >> C

print >> H, '#define GRPC_MDELEM_ACCEPT_ENCODING_FOR_ALGORITHMS(algs) (GRPC_MAKE_MDELEM(&grpc_static_mdelem_table[grpc_static_accept_encoding_metadata[(algs)]], GRPC_MDELEM_STORAGE_STATIC))'
print >> H

print >> H, 'extern const uint8_t grpc_static_accept_stream_encoding_metadata[%d];' % (
    1 << len(STREAM_COMPRESSION_ALGORITHMS))
print >> C, 'const uint8_t grpc_static_accept_stream_encoding_metadata[%d] = {' % (
    1 << len(STREAM_COMPRESSION_ALGORITHMS))
print >> C, '0,%s' % ','.join(
    '%d' % md_idx(elem) for elem in stream_compression_elems)
print >> C, '};'

print >> H, '#define GRPC_MDELEM_ACCEPT_STREAM_ENCODING_FOR_ALGORITHMS(algs) (GRPC_MAKE_MDELEM(&grpc_static_mdelem_table[grpc_static_accept_stream_encoding_metadata[(algs)]], GRPC_MDELEM_STORAGE_STATIC))'

print >> H, '#endif /* GRPC_CORE_LIB_TRANSPORT_STATIC_METADATA_H */'

H.close()
C.close()