I experimented a bit with marshal, pickle, and ast.literal_eval. I think
that using a cache file is the way to go. An update evaluation based on
the mtime is quite fast. You need the YAML to X conversion only if a
build specification file changed or upon first use. We don't have to
store the cache file in the repository (could be 1MiB or more). See
attached example scripts.
My favourite is a conversion to pickle. It is supposed to be a stable
format and was also the fastest, about 0.1 seconds load time.
--
Sebastian Huber, embedded brains GmbH
Address : Dornierstr. 4, D-82178 Puchheim, Germany
Phone : +49 89 189 47 41-16
Fax : +49 89 189 47 41-09
E-Mail : sebastian.hu...@embedded-brains.de
PGP : Public key available on request.
Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
#!/usr/bin/env python
# SPDX-License-Identifier: BSD-2-Clause
#
# Copyright (C) 2019 embedded brains GmbH
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
import ast
import os
import stat
import yaml
items = {}
def is_update_necessary(path, mtime):
names = os.listdir(path)
for name in names:
path2 = os.path.join(path, name)
if name.endswith(".yml") and not name.startswith("."):
mtime2 = os.path.getmtime(path2)
if mtime <= mtime2:
return True
else:
mode = os.lstat(path2).st_mode
if stat.S_ISDIR(mode) and is_update_necessary(path2, mtime):
return True
return False
def aggregate(path):
names = os.listdir(path)
for name in names:
path2 = os.path.join(path, name)
if name.endswith(".yml") and not name.startswith("."):
uid = os.path.basename(name).replace(".yml", "")
with open(path2, "r") as f:
items[uid] = yaml.safe_load(f.read())
else:
mode = os.lstat(path2).st_mode
if stat.S_ISDIR(mode):
aggregate(path2)
cache_file = "spec/items.ast"
try:
mtime = os.path.getmtime(cache_file)
except:
mtime = 0
if is_update_necessary("spec", mtime):
print('update')
aggregate("spec")
print(str(items))
open(cache_file, "w").write(str(items))
ast.literal_eval(open(cache_file, "r").read())
#!/usr/bin/env python
# SPDX-License-Identifier: BSD-2-Clause
#
# Copyright (C) 2019 embedded brains GmbH
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
import marshal
import os
import stat
import yaml
items = {}
def is_update_necessary(path, mtime):
names = os.listdir(path)
for name in names:
path2 = os.path.join(path, name)
if name.endswith(".yml") and not name.startswith("."):
mtime2 = os.path.getmtime(path2)
if mtime <= mtime2:
return True
else:
mode = os.lstat(path2).st_mode
if stat.S_ISDIR(mode) and is_update_necessary(path2, mtime):
return True
return False
def aggregate(path):
names = os.listdir(path)
for name in names:
path2 = os.path.join(path, name)
if name.endswith(".yml") and not name.startswith("."):
uid = os.path.basename(name).replace(".yml", "")
with open(path2, "r") as f:
items[uid] = yaml.safe_load(f.read())
else:
mode = os.lstat(path2).st_mode
if stat.S_ISDIR(mode):
aggregate(path2)
cache_file = "spec/items.marshal"
try:
mtime = os.path.getmtime(cache_file)
except:
mtime = 0
if is_update_necessary("spec", mtime):
print('update')
aggregate("spec")
marshal.dump(items, open(cache_file, "wb"))
marshal.load(open(cache_file, "rb"))
#!/usr/bin/env python
# SPDX-License-Identifier: BSD-2-Clause
#
# Copyright (C) 2019 embedded brains GmbH
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
import pickle
import os
import stat
import yaml
items = {}
def is_update_necessary(path, mtime):
names = os.listdir(path)
for name in names:
path2 = os.path.join(path, name)
if name.endswith(".yml") and not name.startswith("."):
mtime2 = os.path.getmtime(path2)
if mtime <= mtime2:
return True
else:
mode = os.lstat(path2).st_mode
if stat.S_ISDIR(mode) and is_update_necessary(path2, mtime):
return True
return False
def aggregate(path):
names = os.listdir(path)
for name in names:
path2 = os.path.join(path, name)
if name.endswith(".yml") and not name.startswith("."):
uid = os.path.basename(name).replace(".yml", "")
with open(path2, "r") as f:
items[uid] = yaml.safe_load(f.read())
else:
mode = os.lstat(path2).st_mode
if stat.S_ISDIR(mode):
aggregate(path2)
cache_file = "spec/items.pickle"
try:
mtime = os.path.getmtime(cache_file)
except:
mtime = 0
if is_update_necessary("spec", mtime):
print('update')
aggregate("spec")
pickle.dump(items, open(cache_file, "wb"))
pickle.load(open(cache_file, "rb"))
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