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# Test utilities for fetching & caching assets
#
# Copyright 2024 Red Hat, Inc.
#
# This work is licensed under the terms of the GNU GPL, version 2 or
# later. See the COPYING file in the top-level directory.
import hashlib
import logging
import os
import subprocess
import sys
import unittest
import urllib.request
from time import sleep
from pathlib import Path
from shutil import copyfileobj
# Instances of this class must be declared as class level variables
# starting with a name "ASSET_". This enables the pre-caching logic
# to easily find all referenced assets and download them prior to
# execution of the tests.
class Asset:
def __init__(self, url, hashsum):
self.url = url
self.hash = hashsum
cache_dir_env = os.getenv('QEMU_TEST_CACHE_DIR')
if cache_dir_env:
self.cache_dir = Path(cache_dir_env, "download")
else:
self.cache_dir = Path(Path("~").expanduser(),
".cache", "qemu", "download")
self.cache_file = Path(self.cache_dir, hashsum)
self.log = logging.getLogger('qemu-test')
def __repr__(self):
return "Asset: url=%s hash=%s cache=%s" % (
self.url, self.hash, self.cache_file)
def _check(self, cache_file):
if self.hash is None:
return True
if len(self.hash) == 64:
hl = hashlib.sha256()
elif len(self.hash) == 128:
hl = hashlib.sha512()
else:
raise Exception("unknown hash type")
# Calculate the hash of the file:
with open(cache_file, 'rb') as file:
while True:
chunk = file.read(1 << 20)
if not chunk:
break
hl.update(chunk)
return self.hash == hl.hexdigest()
def valid(self):
return self.cache_file.exists() and self._check(self.cache_file)
def _wait_for_other_download(self, tmp_cache_file):
# Another thread already seems to download the asset, so wait until
# it is done, while also checking the size to see whether it is stuck
try:
current_size = tmp_cache_file.stat().st_size
new_size = current_size
except:
if os.path.exists(self.cache_file):
return True
raise
waittime = lastchange = 600
while waittime > 0:
sleep(1)
waittime -= 1
try:
new_size = tmp_cache_file.stat().st_size
except:
if os.path.exists(self.cache_file):
return True
raise
if new_size != current_size:
lastchange = waittime
current_size = new_size
elif lastchange - waittime > 90:
return False
self.log.debug("Time out while waiting for %s!", tmp_cache_file)
raise
def fetch(self):
if not self.cache_dir.exists():
self.cache_dir.mkdir(parents=True, exist_ok=True)
if self.valid():
self.log.debug("Using cached asset %s for %s",
self.cache_file, self.url)
return str(self.cache_file)
if os.environ.get("QEMU_TEST_NO_DOWNLOAD", False):
raise Exception("Asset cache is invalid and downloads disabled")
self.log.info("Downloading %s to %s...", self.url, self.cache_file)
tmp_cache_file = self.cache_file.with_suffix(".download")
for retries in range(3):
try:
with tmp_cache_file.open("xb") as dst:
with urllib.request.urlopen(self.url) as resp:
copyfileobj(resp, dst)
break
except FileExistsError:
self.log.debug("%s already exists, "
"waiting for other thread to finish...",
tmp_cache_file)
if self._wait_for_other_download(tmp_cache_file):
return str(self.cache_file)
self.log.debug("%s seems to be stale, "
"deleting and retrying download...",
tmp_cache_file)
tmp_cache_file.unlink()
continue
except Exception as e:
self.log.error("Unable to download %s: %s", self.url, e)
tmp_cache_file.unlink()
raise
try:
# Set these just for informational purposes
os.setxattr(str(tmp_cache_file), "user.qemu-asset-url",
self.url.encode('utf8'))
os.setxattr(str(tmp_cache_file), "user.qemu-asset-hash",
self.hash.encode('utf8'))
except Exception as e:
self.log.debug("Unable to set xattr on %s: %s", tmp_cache_file, e)
pass
if not self._check(tmp_cache_file):
tmp_cache_file.unlink()
raise Exception("Hash of %s does not match %s" %
(self.url, self.hash))
tmp_cache_file.replace(self.cache_file)
self.log.info("Cached %s at %s" % (self.url, self.cache_file))
return str(self.cache_file)
def precache_test(test):
log = logging.getLogger('qemu-test')
log.setLevel(logging.DEBUG)
handler = logging.StreamHandler(sys.stdout)
handler.setLevel(logging.DEBUG)
formatter = logging.Formatter(
'%(asctime)s - %(name)s - %(levelname)s - %(message)s')
handler.setFormatter(formatter)
log.addHandler(handler)
for name, asset in vars(test.__class__).items():
if name.startswith("ASSET_") and type(asset) == Asset:
log.info("Attempting to cache '%s'" % asset)
asset.fetch()
log.removeHandler(handler)
def precache_suite(suite):
for test in suite:
if isinstance(test, unittest.TestSuite):
Asset.precache_suite(test)
elif isinstance(test, unittest.TestCase):
Asset.precache_test(test)
def precache_suites(path, cacheTstamp):
loader = unittest.loader.defaultTestLoader
tests = loader.loadTestsFromNames([path], None)
with open(cacheTstamp, "w") as fh:
Asset.precache_suite(tests)
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