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Assets are uniquely identified by human-readable-ish url, so make an AssetError exception class that prints url with error message. A property 'transient' is used to capture whether the client may retry or try again later, or if it is a serious and likely permanent error. This is used to retain the existing behaviour of treating HTTP errors other than 404 as 'transient' and not causing precache step to fail. Additionally, partial-downloads and stale asset caches that fail to resolve after the retry limit are now treated as transient and do not cause precache step to fail. For background: The NetBSD archive is, at the time of writing, failing with short transfer. Retrying the fetch at that position (as wget does) results in a "503 backend unavailable" error. We would like to get that error code directly, but I have not found a way to do that with urllib, so treating the short-copy as a transient failure covers that case (and seems like a reasonable way to handle it in general). Reviewed-by: Thomas Huth <thuth@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Message-ID: <20250312130002.945508-4-npiggin@gmail.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
230 lines
8.4 KiB
Python
230 lines
8.4 KiB
Python
# Test utilities for fetching & caching assets
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#
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# Copyright 2024 Red Hat, Inc.
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#
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# This work is licensed under the terms of the GNU GPL, version 2 or
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# later. See the COPYING file in the top-level directory.
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import hashlib
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import logging
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import os
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import stat
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import sys
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import unittest
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import urllib.request
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from time import sleep
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from pathlib import Path
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from shutil import copyfileobj
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from urllib.error import HTTPError
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class AssetError(Exception):
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def __init__(self, asset, msg, transient=False):
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self.url = asset.url
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self.msg = msg
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self.transient = transient
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def __str__(self):
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return "%s: %s" % (self.url, self.msg)
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# Instances of this class must be declared as class level variables
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# starting with a name "ASSET_". This enables the pre-caching logic
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# to easily find all referenced assets and download them prior to
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# execution of the tests.
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class Asset:
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def __init__(self, url, hashsum):
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self.url = url
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self.hash = hashsum
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cache_dir_env = os.getenv('QEMU_TEST_CACHE_DIR')
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if cache_dir_env:
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self.cache_dir = Path(cache_dir_env, "download")
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else:
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self.cache_dir = Path(Path("~").expanduser(),
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".cache", "qemu", "download")
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self.cache_file = Path(self.cache_dir, hashsum)
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self.log = logging.getLogger('qemu-test')
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def __repr__(self):
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return "Asset: url=%s hash=%s cache=%s" % (
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self.url, self.hash, self.cache_file)
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def __str__(self):
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return str(self.cache_file)
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def _check(self, cache_file):
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if self.hash is None:
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return True
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if len(self.hash) == 64:
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hl = hashlib.sha256()
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elif len(self.hash) == 128:
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hl = hashlib.sha512()
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else:
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raise AssetError(self, "unknown hash type")
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# Calculate the hash of the file:
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with open(cache_file, 'rb') as file:
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while True:
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chunk = file.read(1 << 20)
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if not chunk:
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break
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hl.update(chunk)
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return self.hash == hl.hexdigest()
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def valid(self):
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return self.cache_file.exists() and self._check(self.cache_file)
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def fetchable(self):
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return not os.environ.get("QEMU_TEST_NO_DOWNLOAD", False)
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def available(self):
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return self.valid() or self.fetchable()
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def _wait_for_other_download(self, tmp_cache_file):
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# Another thread already seems to download the asset, so wait until
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# it is done, while also checking the size to see whether it is stuck
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try:
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current_size = tmp_cache_file.stat().st_size
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new_size = current_size
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except:
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if os.path.exists(self.cache_file):
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return True
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raise
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waittime = lastchange = 600
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while waittime > 0:
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sleep(1)
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waittime -= 1
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try:
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new_size = tmp_cache_file.stat().st_size
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except:
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if os.path.exists(self.cache_file):
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return True
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raise
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if new_size != current_size:
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lastchange = waittime
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current_size = new_size
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elif lastchange - waittime > 90:
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return False
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self.log.debug("Time out while waiting for %s!", tmp_cache_file)
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raise
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def fetch(self):
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if not self.cache_dir.exists():
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self.cache_dir.mkdir(parents=True, exist_ok=True)
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if self.valid():
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self.log.debug("Using cached asset %s for %s",
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self.cache_file, self.url)
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return str(self.cache_file)
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if not self.fetchable():
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raise AssetError(self,
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"Asset cache is invalid and downloads disabled")
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self.log.info("Downloading %s to %s...", self.url, self.cache_file)
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tmp_cache_file = self.cache_file.with_suffix(".download")
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for retries in range(3):
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try:
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with tmp_cache_file.open("xb") as dst:
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with urllib.request.urlopen(self.url) as resp:
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copyfileobj(resp, dst)
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length_hdr = resp.getheader("Content-Length")
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# Verify downloaded file size against length metadata, if
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# available.
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if length_hdr is not None:
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length = int(length_hdr)
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fsize = tmp_cache_file.stat().st_size
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if fsize != length:
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self.log.error("Unable to download %s: "
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"connection closed before "
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"transfer complete (%d/%d)",
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self.url, fsize, length)
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tmp_cache_file.unlink()
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continue
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break
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except FileExistsError:
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self.log.debug("%s already exists, "
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"waiting for other thread to finish...",
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tmp_cache_file)
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if self._wait_for_other_download(tmp_cache_file):
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return str(self.cache_file)
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self.log.debug("%s seems to be stale, "
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"deleting and retrying download...",
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tmp_cache_file)
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tmp_cache_file.unlink()
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continue
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except HTTPError as e:
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tmp_cache_file.unlink()
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self.log.error("Unable to download %s: HTTP error %d",
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self.url, e.code)
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# Treat 404 as fatal, since it is highly likely to
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# indicate a broken test rather than a transient
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# server or networking problem
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if e.code == 404:
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raise AssetError(self, "Unable to download: "
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"HTTP error %d" % e.code)
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continue
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except Exception as e:
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tmp_cache_file.unlink()
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raise AssetError(self, "Unable to download: " % e)
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if not os.path.exists(tmp_cache_file):
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raise AssetError(self, "Download retries exceeded", transient=True)
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try:
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# Set these just for informational purposes
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os.setxattr(str(tmp_cache_file), "user.qemu-asset-url",
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self.url.encode('utf8'))
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os.setxattr(str(tmp_cache_file), "user.qemu-asset-hash",
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self.hash.encode('utf8'))
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except Exception as e:
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self.log.debug("Unable to set xattr on %s: %s", tmp_cache_file, e)
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pass
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if not self._check(tmp_cache_file):
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tmp_cache_file.unlink()
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raise AssetError(self, "Hash does not match %s" % self.hash)
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tmp_cache_file.replace(self.cache_file)
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# Remove write perms to stop tests accidentally modifying them
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os.chmod(self.cache_file, stat.S_IRUSR | stat.S_IRGRP)
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self.log.info("Cached %s at %s" % (self.url, self.cache_file))
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return str(self.cache_file)
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def precache_test(test):
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log = logging.getLogger('qemu-test')
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log.setLevel(logging.DEBUG)
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handler = logging.StreamHandler(sys.stdout)
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handler.setLevel(logging.DEBUG)
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formatter = logging.Formatter(
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'%(asctime)s - %(name)s - %(levelname)s - %(message)s')
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handler.setFormatter(formatter)
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log.addHandler(handler)
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for name, asset in vars(test.__class__).items():
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if name.startswith("ASSET_") and type(asset) == Asset:
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log.info("Attempting to cache '%s'" % asset)
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try:
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asset.fetch()
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except AssetError as e:
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if not e.transient:
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raise
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log.error("%s: skipping asset precache" % e)
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log.removeHandler(handler)
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def precache_suite(suite):
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for test in suite:
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if isinstance(test, unittest.TestSuite):
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Asset.precache_suite(test)
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elif isinstance(test, unittest.TestCase):
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Asset.precache_test(test)
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def precache_suites(path, cacheTstamp):
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loader = unittest.loader.defaultTestLoader
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tests = loader.loadTestsFromNames([path], None)
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with open(cacheTstamp, "w") as fh:
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Asset.precache_suite(tests)
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