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import collections
Entry = collections.namedtuple('Entry', 'version, hash')
def update_hash(seed, value):
# Good old boost::hash_combine
# https://www.boost.org/doc/libs/1_35_0/doc/html/boost/hash_combine_id241013.html
return seed ^ (hash(value) + 0x9e3779b9 + (seed << 6) + (seed >> 2))
def hash_source_files(hash_value, source_files):
for filename in source_files:
with open(filename) as file:
hash_value = update_hash(hash_value, file.read())
return hash_value
def hash_build_arguments(hash_value, build_arguments):
for group in build_arguments:
if group:
for argument in group:
hash_value = update_hash(hash_value, argument)
return hash_value
class ExtensionVersioner(object):
def __init__(self):
self.entries = {}
def get_version(self, name):
entry = self.entries.get(name)
return None if entry is None else entry.version
def bump_version_if_changed(self,
name,
source_files,
build_arguments,
build_directory,
with_cuda):
hash_value = 0
hash_value = hash_source_files(hash_value, source_files)
hash_value = hash_build_arguments(hash_value, build_arguments)
hash_value = update_hash(hash_value, build_directory)
hash_value = update_hash(hash_value, with_cuda)
entry = self.entries.get(name)
if entry is None:
self.entries[name] = entry = Entry(0, hash_value)
elif hash_value != entry.hash:
self.entries[name] = entry = Entry(entry.version + 1, hash_value)
return entry.version
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