nghttp2/python/hpackmake.py

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#!/usr/bin/env python
#
# This script reads input headers from json file given in the
# command-line (each file must be written in the format described in
# https://github.com/Jxck/hpack-test-case but we require only
# 'headers' data). Then it encodes input header set and write the
# encoded header block in the same format. The output files are
# created under 'out' directory in the current directory. It must
# exist, otherwise the script will fail. The output filename is the
# same as the input filename.
#
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import sys, base64, json, os.path, os, argparse, errno
from binascii import b2a_hex
import nghttp2
def testsuite(testdata, filename, outdir, table_size, deflate_table_size,
simulate_table_size_change):
res = {
'draft':8,
'description': '''\
Encoded by nghttp2. The basic encoding strategy is described in \
http://lists.w3.org/Archives/Public/ietf-http-wg/2013JulSep/1135.html \
We use huffman encoding only if it produces strictly shorter byte string than \
original. We make some headers not indexing at all, but this does not always \
result in less bits on the wire.'''
}
cases = []
deflater = nghttp2.HDDeflater(deflate_table_size)
if table_size != nghttp2.DEFAULT_HEADER_TABLE_SIZE:
deflater.change_table_size(table_size)
num_item = len(testdata['cases'])
change_points = {}
if simulate_table_size_change and num_item > 1:
change_points[num_item * 2 // 3] = table_size * 2 // 3
change_points[num_item // 3] = table_size // 3
for casenum, item in enumerate(testdata['cases']):
outitem = {
'seqno': casenum,
'headers': item['headers']
}
if casenum in change_points:
new_table_size = change_points[casenum]
deflater.change_table_size(new_table_size)
outitem['header_table_size'] = new_table_size
casenum += 1
hdrs = [(list(x.keys())[0].encode('utf-8'),
list(x.values())[0].encode('utf-8')) \
for x in item['headers']]
outitem['wire'] = b2a_hex(deflater.deflate(hdrs)).decode('utf-8')
cases.append(outitem)
if cases and table_size != nghttp2.DEFAULT_HEADER_TABLE_SIZE:
cases[0]['header_table_size'] = table_size
res['cases'] = cases
jsonstr = json.dumps(res, indent=2)
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with open(os.path.join(outdir, filename), 'w') as f:
f.write(jsonstr)
if __name__ == '__main__':
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ap = argparse.ArgumentParser(description='HPACK test case generator')
ap.add_argument('-d', '--dir', help='output directory', default='out')
ap.add_argument('-s', '--table-size', help='max header table size',
type=int, default=nghttp2.DEFAULT_HEADER_TABLE_SIZE)
ap.add_argument('-S', '--deflate-table-size',
help='max header table size for deflater',
type=int, default=nghttp2.DEFLATE_MAX_HEADER_TABLE_SIZE)
ap.add_argument('-c', '--simulate-table-size-change',
help='simulate table size change scenario',
action='store_true')
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ap.add_argument('file', nargs='*', help='input file')
args = ap.parse_args()
try:
os.mkdir(args.dir)
except OSError as e:
if e.errno != errno.EEXIST:
raise e
for filename in args.file:
sys.stderr.write('{}\n'.format(filename))
with open(filename) as f:
input = f.read()
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testsuite(json.loads(input), os.path.basename(filename),
args.dir, args.table_size, args.deflate_table_size,
args.simulate_table_size_change)