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#!/usr/bin/env python
#
# Public Domain 2014-present MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
#
# This is free and unencumbered software released into the public domain.
#
# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any
# means.
#
# In jurisdictions that recognize copyright laws, the author or authors
# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
# successors. We intend this dedication to be an overt act of
# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
# Decode a checkpoint 'addr'
#
# This script uses WiredTiger's integer unpacking library. To load the
# WiredTiger library built in a development tree, you may have to set
# LD_LIBRARY_PATH or the equivalent for your system. For example:
# $ export LD_LIBRARY_PATH=`pwd`/../build
import os, sys, getopt
def usage():
print('Usage:\n\
$ python .../tools/wt_ckpt_decode.py [ -a allocsize ] addr...\n\
\n\
addr is a hex string\n\
')
def err_usage(msg):
print('wt_ckpt_decode.py: ERROR: ' + msg)
usage()
sys.exit(False)
# Set paths
wt_disttop = sys.path[0]
env_builddir = os.getenv('WT_BUILDDIR')
curdir = os.getcwd()
if env_builddir and os.path.isfile(os.path.join(env_builddir, 'wt')):
wt_builddir = env_builddir
elif os.path.isfile(os.path.join(curdir, 'wt')):
wt_builddir = curdir
else:
err_usage('Unable to find useable WiredTiger build.'
'Call the script from either the build directory root or set the \'WT_BUILDDIR\' environment variable')
sys.path.insert(1, os.path.join(wt_builddir, 'lang', 'python'))
from wiredtiger.packing import unpack
def show_one(label, value):
l = 16 - len(label)
l = l if l > 1 else 1
print(' {0}{1}{2:10d} (0x{2:x})'.format(label, (' ' * l), value, value))
def show_ref(ref, name, allocsize):
if len(ref) == 4:
show_one(name + ' object', ref[0])
ref = ref[1:]
off = ref[0]
size = ref[1]
csum = ref[2]
if size == 0:
off = -1
csum = 0
show_one(name + ' offset', (off + 1) * allocsize)
show_one(name + ' size', (size) * allocsize)
show_one(name + ' cksum', csum)
print('')
def decode_arg(arg, allocsize):
addr = bytearray.fromhex(arg)
version = addr[0]
print(arg + ': ')
if version != 1:
print('**** ERROR: unknown version ' + str(version))
addr = bytes(addr[1:])
# The number of values in a checkpoint may be 14 or 18. In the latter case, the checkpoint is
# for a tiered Btree, and contains object ids for each of the four references in the checkpoint.
# In the former case, the checkpoint is for a regular (local, single file) Btree, and there are
# no objects. Based on what is present, we show them slightly appropriately.
# First, we get the largest number of ints that can be decoded.
result = []
iformat = 'iiiiiiiiiiiiii'
result_len = 0
while True:
try:
result = unpack(iformat, addr)
result_len = len(result)
except:
break
iformat += 'i'
# Then we check the number of results against what we expect.
if result_len == 14:
ref_cnt = 3 # no object ids
elif result_len == 18:
ref_cnt = 4 # has object ids
else:
if result_len == 0:
result_len = 'unknown'
print('**** ERROR: number of integers to decode ({}) '.format(result_len) +
'does not match expected checkpoint format')
return
pos = 0
# Now that we know whether the references have object ids, we can show them.
for refname in [ 'root', 'alloc', 'avail', 'discard' ]:
show_ref(result[pos : pos + ref_cnt], refname, allocsize)
pos += ref_cnt
file_size = result[pos]
ckpt_size = result[pos+1]
show_one('file size', file_size)
show_one('checkpoint size', ckpt_size)
#decode_arg('018281e420f2fa4a8381e40c5855ca808080808080e22fc0e20fc0', 4096) # regular Btree
#decode_arg('01818181e412e4fd01818281e41546bd16818381e4f2dbec3980808080e22fc0cfc0', 4096) # tiered
#decode_arg('01818181e412e4fd01818281e41546bd16818381e4f2dbec39808080e22fc0cfc0', 4096) # bad
allocsize = 4096
try:
opts, args = getopt.getopt(sys.argv[1:], "a:", ["allocsize"])
except getopt.GetoptError as err:
err_usage(str(err))
for o, a in opts:
if o == '-a':
allocsize = int(a)
for arg in args:
decode_arg(arg, allocsize)
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