interfaces: introduce and use a protocol class for the `charencoding` module
See
f2832de2a46c for details when this was done for the `bdiff` module.
This lets us dump the hack where the `pure` implementation was imported during
the type checking phase to provide signatures for the module methods it
provides. Now the protocol classes are starting to shine, because these methods
are provided by `pure.charencoding` and `cext.parsers`, and references to
`cffi.charencoding` and `cext.charencoding` are forwarded to them as appropriate
by the `policy` module. But none of that matters, as long as the module
returned provides the listed methods.
The interface was copy/pasted from the `pure` module, but `jsonescapeu8fallback`
is omitted because it is accessed from the `pure` module directly when the
escaping fails in the primary module's `jsonescapeu8()`.
#!/usr/bin/env python3
# Search for interesting discovery instance
#
# search-discovery-case REPO [REPO]…
#
# This use a subsetmaker extension (next to this script) to generate a steam of
# random discovery instance. When interesting case are discovered, information
# about them are print on the stdout.
import json
import os
import queue
import random
import signal
import subprocess
import sys
import threading
this_script = os.path.abspath(sys.argv[0])
this_dir = os.path.dirname(this_script)
hg_dir = os.path.join(this_dir, '..', '..')
HG_REPO = os.path.normpath(hg_dir)
HG_BIN = os.path.join(HG_REPO, 'hg')
JOB = int(os.environ.get('NUMBER_OF_PROCESSORS', 8))
SLICING = ('scratch', 'randomantichain', 'rev')
def nb_revs(repo_path):
cmd = [
HG_BIN,
'--repository',
repo_path,
'log',
'--template',
'{rev}',
'--rev',
'tip',
]
s = subprocess.Popen(cmd, stdout=subprocess.PIPE)
out, err = s.communicate()
return int(out)
repos = []
for repo in sys.argv[1:]:
size = nb_revs(repo)
repos.append((repo, size))
def pick_one(repo):
pick = random.choice(SLICING)
seed = random.randint(0, 100000)
if pick == 'scratch':
start = int(repo[1] * 0.3)
end = int(repo[1] * 0.7)
nb = random.randint(start, end)
return ('scratch', nb, seed)
elif pick == 'randomantichain':
return ('randomantichain', seed)
elif pick == 'rev':
start = int(repo[1] * 0.3)
end = int(repo[1])
rev = random.randint(start, end)
return ('rev', rev)
else:
assert False
done = threading.Event()
cases = queue.Queue(maxsize=10 * JOB)
results = queue.Queue()
def worker():
while not done.is_set():
c = cases.get()
if c is None:
return
try:
res = process(c)
results.put((c, res))
except Exception as exc:
print('processing-failed: %s %s' % (c, exc), file=sys.stderr)
c = (c[0], c[2], c[1])
try:
res = process(c)
results.put((c, res))
except Exception as exc:
print('processing-failed: %s %s' % (c, exc), file=sys.stderr)
SUBSET_PATH = os.path.join(HG_REPO, 'contrib', 'perf-utils', 'subsetmaker.py')
CMD_BASE = (
HG_BIN,
'debugdiscovery',
'--template',
'json',
'--config',
'extensions.subset=%s' % SUBSET_PATH,
)
# '--local-as-revs "$left" --local-as-revs "$right"'
# > /data/discovery-references/results/disco-mozilla-unified-$1-$2.txt
# )
def to_revsets(case):
t = case[0]
if t == 'scratch':
return 'not scratch(all(), %d, "%d")' % (case[1], case[2])
elif t == 'randomantichain':
return '::randomantichain(all(), "%d")' % case[1]
elif t == 'rev':
return '::%d' % case[1]
else:
assert False
def process(case):
(repo, left, right) = case
cmd = list(CMD_BASE)
cmd.append('-R')
cmd.append(repo[0])
cmd.append('--local-as-revs')
cmd.append(to_revsets(left))
cmd.append('--remote-as-revs')
cmd.append(to_revsets(right))
s = subprocess.Popen(cmd, stdout=subprocess.PIPE)
out, err = s.communicate()
return json.loads(out)[0]
def interesting_boundary(res):
"""check if a case is interesting or not
For now we are mostly interrested in case were we do multiple roundstrip
and where the boundary is somewhere in the middle of the undecided set.
Ideally, we would make this configurable, but this is not a focus for now
return None or (
round-trip,
undecided-common,
undecided-missing,
total-revs,
common-revs,
missing-revs,
)
"""
roundtrips = res["total-roundtrips"]
if roundtrips <= 1:
return None
total_revs = res["nb-revs"]
common_revs = res["nb-revs-common"]
missing_revs = res["nb-revs-missing"]
undecided_common = res["nb-ini_und-common"]
undecided_missing = res["nb-ini_und-missing"]
if undecided_common == 0:
return None
if undecided_missing == 0:
return None
return (
roundtrips,
undecided_common,
undecided_missing,
total_revs,
common_revs,
missing_revs,
)
def end(*args, **kwargs):
done.set()
def format_case(case):
return '-'.join(str(s) for s in case)
signal.signal(signal.SIGINT, end)
for i in range(JOB):
threading.Thread(target=worker).start()
nb_cases = 0
while not done.is_set():
repo = random.choice(repos)
left = pick_one(repo)
right = pick_one(repo)
cases.put((repo, left, right))
while not results.empty():
# results has a single reader so this is fine
c, res = results.get_nowait()
boundary = interesting_boundary(res)
if boundary is not None:
print(c[0][0], format_case(c[1]), format_case(c[2]), *boundary)
sys.stdout.flush()
nb_cases += 1
if not nb_cases % 100:
print('[%d cases generated]' % nb_cases, file=sys.stderr)
for i in range(JOB):
try:
cases.put_nowait(None)
except queue.Full:
pass
print('[%d cases generated]' % nb_cases, file=sys.stderr)
print('[ouput generation is over]' % nb_cases, file=sys.stderr)