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
|
#!/usr/bin/env python2.7
# Copyright 2015, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""Read from stdin a set of colon separated http headers:
:path: /foo/bar
content-type: application/grpc
Write a set of strings containing a hpack encoded http2 frame that
represents said headers."""
import json
import sys
import argparse
def append_never_indexed(payload_line, n, count, key, value):
payload_line.append(0x10)
assert(len(key) <= 126)
payload_line.append(len(key))
payload_line.extend(ord(c) for c in key)
assert(len(value) <= 126)
payload_line.append(len(value))
payload_line.extend(ord(c) for c in value)
def append_inc_indexed(payload_line, n, count, key, value):
payload_line.append(0x40)
assert(len(key) <= 126)
payload_line.append(len(key))
payload_line.extend(ord(c) for c in key)
assert(len(value) <= 126)
payload_line.append(len(value))
payload_line.extend(ord(c) for c in value)
def append_pre_indexed(payload_line, n, count, key, value):
payload_line.append(0x80 + 61 + count - n)
_COMPRESSORS = {
'never': append_never_indexed,
'inc': append_inc_indexed,
'pre': append_pre_indexed,
}
argp = argparse.ArgumentParser('Generate header frames')
argp.add_argument('--set_end_stream', default=False, action='store_const', const=True)
argp.add_argument('--no_framing', default=False, action='store_const', const=True)
argp.add_argument('--compression', choices=sorted(_COMPRESSORS.keys()), default='never')
argp.add_argument('--hex', default=False, action='store_const', const=True)
args = argp.parse_args()
# parse input, fill in vals
vals = []
for line in sys.stdin:
line = line.strip()
if line == '': continue
if line[0] == '#': continue
key_tail, value = line[1:].split(':')
key = (line[0] + key_tail).strip()
value = value.strip()
vals.append((key, value))
# generate frame payload binary data
payload_bytes = []
if not args.no_framing:
payload_bytes.append([]) # reserve space for header
payload_len = 0
n = 0
for key, value in vals:
payload_line = []
_COMPRESSORS[args.compression](payload_line, n, len(vals), key, value)
n += 1
payload_len += len(payload_line)
payload_bytes.append(payload_line)
# fill in header
if not args.no_framing:
flags = 0x04 # END_HEADERS
if args.set_end_stream:
flags |= 0x01 # END_STREAM
payload_bytes[0].extend([
(payload_len >> 16) & 0xff,
(payload_len >> 8) & 0xff,
(payload_len) & 0xff,
# header frame
0x01,
# flags
flags,
# stream id
0x00,
0x00,
0x00,
0x01
])
hex_bytes = [ord(c) for c in "abcdefABCDEF0123456789"]
def esc_c(line):
out = "\""
last_was_hex = False
for c in line:
if 32 <= c < 127:
if c in hex_bytes and last_was_hex:
out += "\"\""
if c != ord('"'):
out += chr(c)
else:
out += "\\\""
last_was_hex = False
else:
out += "\\x%02x" % c
last_was_hex = True
return out + "\""
# dump bytes
if args.hex:
all_bytes = []
for line in payload_bytes:
all_bytes.extend(line)
print '{%s}' % ', '.join('0x%02x' % c for c in all_bytes)
else:
for line in payload_bytes:
print esc_c(line)
|
