nghttp2/python/hpackmake.py

55 lines
2.0 KiB
Python
Executable File

#!/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.
#
import sys, base64, json, os.path
from binascii import b2a_hex
import nghttp2
def testsuite(testdata, filename):
if testdata['context'] == 'request':
side = nghttp2.HD_SIDE_REQUEST
else:
side = nghttp2.HD_SIDE_RESPONSE
res = {
'draft':5, 'context': testdata['context'],
'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(side)
for casenum, item in enumerate(testdata['cases']):
outitem = {
'header_table_size': 4096,
'headers': item['headers']
}
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)
res['cases'] = cases
jsonstr = json.dumps(res, indent=2)
with open(os.path.join('out', filename), 'w') as f:
f.write(jsonstr)
if __name__ == '__main__':
for filename in sys.argv[1:]:
sys.stderr.write('{}\n'.format(filename))
with open(filename) as f:
input = f.read()
testsuite(json.loads(input), os.path.basename(filename))