chttp2_ref_leak.py

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#!/usr/bin/env python3
# Copyright 2017 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
 
# Reads stdin to find chttp2_refcount log lines, and prints reference leaks
# to stdout
 
import collections
import re
import sys
 
 
def new_obj():
    return ['destroy']
 
 
outstanding = collections.defaultdict(new_obj)
 
# Sample log line:
# chttp2:unref:0x629000005200 2->1 destroy [src/core/ext/transport/chttp2/transport/chttp2_transport.c:599]
 
for line in sys.stdin:
    m = re.search(
        r'chttp2:(  ref|unref):0x([a-fA-F0-9]+) [^ ]+ ([^[]+) \[(.*)\]', line)
    if m:
        if m.group(1) == '  ref':
            outstanding[m.group(2)].append(m.group(3))
        else:
            outstanding[m.group(2)].remove(m.group(3))
 
for obj, remaining in list(outstanding.items()):
    if remaining:
        print(('LEAKED: %s %r' % (obj, remaining)))