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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
import argparse
import json
import os
import pathlib
import sys
import urllib.request
# default cache file location in STATE_DIR location
default_cache_path = ".moz-fast-forward/milestone.cache"
def fetch_branch_head_dict():
milestone_url = (
"https://chromiumdash.appspot.com/fetch_milestones?only_branched=true"
)
uf = urllib.request.urlopen(milestone_url)
html = uf.read()
milestone_dict = json.loads(html)
# There is more information in the json dictionary, but we only care
# about the milestone (version) to branch "name" (webrtc_branch)
# info. For example:
# v106 -> 5249 (which translates to branch-heads/5249)
# v107 -> 5304 (which translates to branch-heads/5304)
#
# As returned from web query, milestones are integers and branch
# "names" are strings.
new_dict = {}
for row in milestone_dict:
new_dict[row["milestone"]] = row["webrtc_branch"]
return new_dict
def read_dict_from_cache(cache_path):
if cache_path is not None and os.path.exists(cache_path):
with open(cache_path, "r") as ifile:
return json.loads(ifile.read(), object_hook=jsonKeys2int)
return {}
def write_dict_to_cache(cache_path, milestones):
with open(cache_path, "w") as ofile:
ofile.write(json.dumps(milestones))
def get_branch_head(milestone, cache_path=default_cache_path):
milestones = read_dict_from_cache(cache_path)
# if the cache didn't exist or is stale, try to fetch using a web query
if milestone not in milestones:
try:
milestones = fetch_branch_head_dict()
write_dict_to_cache(cache_path, milestones)
except Exception:
pass
if milestone in milestones:
return milestones[milestone]
return None
# From https://stackoverflow.com/questions/1450957/pythons-json-module-converts-int-dictionary-keys-to-strings
def jsonKeys2int(x):
if isinstance(x, dict):
return {int(k): v for k, v in x.items()}
return x
if __name__ == "__main__":
parser = argparse.ArgumentParser(
description="Get libwebrtc branch-head for given chromium milestone"
)
parser.add_argument(
"milestone", type=int, help="integer chromium milestone (example: 106)"
)
parser.add_argument("-v", "--verbose", action="store_true")
parser.add_argument("-c", "--cache", type=pathlib.Path, help="path to cache file")
args = parser.parse_args()
# if the user provided a cache path use it, otherwise use the default
local_cache_path = args.cache or default_cache_path
branch_head = get_branch_head(args.milestone, local_cache_path)
if branch_head is None:
sys.exit("error: chromium milestone '{}' is not found.".format(args.milestone))
if args.verbose:
print(
"chromium milestone {} uses branch-heads/{}".format(
args.milestone, branch_head
)
)
else:
print(branch_head)
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