153 lines
4.9 KiB
Python
153 lines
4.9 KiB
Python
import os
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import re
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import torch
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import hashlib
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import urllib.request
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import urllib.error
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from tqdm import tqdm
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from urllib.parse import urlparse
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from typing import Dict, Optional
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def natural_sort_key(s, regex=re.compile("([0-9]+)")):
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return [int(text) if text.isdigit() else text.lower() for text in regex.split(s)]
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def walk_files(path, allowed_extensions=None):
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if not os.path.exists(path):
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return
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if allowed_extensions is not None:
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allowed_extensions = set(allowed_extensions)
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items = list(os.walk(path, followlinks=True))
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items = sorted(items, key=lambda x: natural_sort_key(x[0]))
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for root, _, files in items:
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for filename in sorted(files, key=natural_sort_key):
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if allowed_extensions is not None:
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_, ext = os.path.splitext(filename)
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if ext not in allowed_extensions:
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continue
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# Skip hidden files
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if "/." in root or "\\." in root:
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continue
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yield os.path.join(root, filename)
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def load_file_from_url(
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url: str,
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*,
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model_dir: str,
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progress: bool = True,
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file_name: str | None = None,
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) -> str:
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"""Download a file from `url` into `model_dir`, using the file present if possible.
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Returns the path to the downloaded file.
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"""
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os.makedirs(model_dir, exist_ok=True)
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if not file_name:
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parts = urlparse(url)
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file_name = os.path.basename(parts.path)
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cached_file = os.path.abspath(os.path.join(model_dir, file_name))
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if not os.path.exists(cached_file):
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print(f'Downloading: "{url}" to {cached_file}\n')
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from torch.hub import download_url_to_file
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download_url_to_file(url, cached_file, progress=progress)
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return cached_file
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def calculate_sha(file: str, force=False) -> Optional[str]:
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sha_file = f"{file}.sha"
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# Check if the .sha file exists
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if not force and os.path.exists(sha_file):
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try:
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with open(sha_file, "r") as f:
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stored_hash = f.read().strip()
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if stored_hash:
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return stored_hash
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except IOError as e:
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print(f"Failed to read hash: {e}")
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# Calculate the hash if the .sha file doesn't exist or is empty
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try:
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with open(file, "rb") as fp:
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file_hash = hashlib.sha256()
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while chunk := fp.read(8192):
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file_hash.update(chunk)
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calculated_hash = file_hash.hexdigest()
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# Write the calculated hash to the .sha file
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try:
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with open(sha_file, "w") as f:
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f.write(calculated_hash)
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except IOError as e:
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print(f"Failed to write hash to {sha_file}: {e}")
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return calculated_hash
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except IOError as e:
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print(f"Failed to read file {file}: {e}")
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return None
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def download_file(url: str, dst: str, sha256sum: Optional[str] = None) -> Dict[str, Optional[str]]:
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"""
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Downloads a file from a URL to a destination path, optionally verifying its SHA-256 checksum.
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:param url: URL of the file to download
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:param dst: Destination path to save the downloaded file
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:param sha256sum: Optional SHA-256 checksum to verify the downloaded file
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:return: Dictionary with file path, download status, calculated checksum, and checksum match status
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"""
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# Ensure the directory exists
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os.makedirs(os.path.dirname(dst), exist_ok=True)
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file_exists = os.path.isfile(dst)
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file_checksum = None
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checksum_match = None
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downloaded = False
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try:
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if file_exists:
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file_checksum = calculate_sha(dst)
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if sha256sum:
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checksum_match = file_checksum == sha256sum
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if not checksum_match:
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os.remove(dst)
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if not file_exists or checksum_match == False:
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with tqdm(unit="B", unit_scale=True, unit_divisor=1024, miniters=1, desc=dst.split("/")[-1]) as t:
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def reporthook(blocknum, blocksize, totalsize):
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if t.total is None and totalsize > 0:
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t.total = totalsize
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read_so_far = blocknum * blocksize
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t.update(max(0, read_so_far - t.n))
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urllib.request.urlretrieve(url, dst, reporthook=reporthook)
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downloaded = True
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file_checksum = calculate_sha(dst, force=True)
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if sha256sum:
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checksum_match = file_checksum == sha256sum
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except urllib.error.URLError as ex:
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print("Download failed:", ex)
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if os.path.isfile(dst):
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os.remove(dst)
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except Exception as ex:
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print("An error occurred:", ex)
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finally:
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return {"file": dst, "downloaded": downloaded, "sha": file_checksum, "match": checksum_match}
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def load_jit_torch_file(model_path: str):
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model = torch.jit.load(model_path, map_location="cpu")
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model.eval()
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return model
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