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import hashlib
import json
import os.path
import filelock
from modules import shared
from modules.paths import data_path
cache_filename = os.path.join(data_path, "cache.json")
cache_data = None
def dump_cache():
with filelock.FileLock(cache_filename+".lock"):
with open(cache_filename, "w", encoding="utf8") as file:
json.dump(cache_data, file, indent=4)
def cache(subsection):
global cache_data
if cache_data is None:
with filelock.FileLock(cache_filename+".lock"):
if not os.path.isfile(cache_filename):
cache_data = {}
else:
with open(cache_filename, "r", encoding="utf8") as file:
cache_data = json.load(file)
s = cache_data.get(subsection, {})
cache_data[subsection] = s
return s
def calculate_sha256(filename):
hash_sha256 = hashlib.sha256()
blksize = 1024 * 1024
with open(filename, "rb") as f:
for chunk in iter(lambda: f.read(blksize), b""):
hash_sha256.update(chunk)
return hash_sha256.hexdigest()
def sha256_from_cache(filename, title):
hashes = cache("hashes")
ondisk_mtime = os.path.getmtime(filename)
if title not in hashes:
return None
cached_sha256 = hashes[title].get("sha256", None)
cached_mtime = hashes[title].get("mtime", 0)
if ondisk_mtime > cached_mtime or cached_sha256 is None:
return None
return cached_sha256
def sha256(filename, title):
hashes = cache("hashes")
sha256_value = sha256_from_cache(filename, title)
if sha256_value is not None:
return sha256_value
if shared.cmd_opts.no_hashing:
return None
print(f"Calculating sha256 for {filename}: ", end='')
sha256_value = calculate_sha256(filename)
print(f"{sha256_value}")
hashes[title] = {
"mtime": os.path.getmtime(filename),
"sha256": sha256_value,
}
dump_cache()
return sha256_value
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