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#!/usr/bin/env python3
'''
t5_cache.py - this file is part of S3QL.
Copyright © 2017 IOFabric, Inc.
All Rights Reserved.
'''
if __name__ == '__main__':
import sys
import pytest
sys.exit(pytest.main([__file__] + sys.argv[1:]))
import os
import shutil
import subprocess
import tempfile
import time
from os.path import join as pjoin
import pytest
import t4_fuse
from s3ql.common import escape
with open(__file__, 'rb') as fh:
TEST_DATA = fh.read()
class TestPerstCache(t4_fuse.TestFuse):
# Need to overwrite parent class' method with something, thus the
# inexpressive name.
def test(self):
# Write test data
self.mkfs()
self.mount(extra_args=['--keep-cache'])
with open(pjoin(self.mnt_dir, 'testfile'), 'wb') as fh:
fh.write(TEST_DATA)
self.umount()
# Poison backend storage object
with open(pjoin(self.backend_dir, 's3ql_data_', 's3ql_data_1'), 'wb') as fh:
fh.write(b'poison!')
# fsck.s3ql shouldn't report errors
self.fsck()
# Ensure that we read from cache
self.mount()
with open(pjoin(self.mnt_dir, 'testfile'), 'rb') as fh:
assert fh.read() == TEST_DATA
self.umount()
def test_cache_upload(self):
self.reg_output(r'^WARNING: Writing dirty block', count=1)
self.reg_output(r'^WARNING: Remote metadata is outdated', count=1)
# Write test data
self.mkfs()
self.mount(extra_args=['--keep-cache'])
with open(pjoin(self.mnt_dir, 'testfile'), 'wb') as fh:
fh.write(TEST_DATA)
# Kill mount
self.flush_cache()
self.mount_process.kill()
self.mount_process.wait()
self.umount_fuse()
# Update cache files
cache_file = pjoin(self.cache_dir, escape(self.storage_url) + '-cache', '4-0')
with open(cache_file, 'rb+') as fh:
fh.write(TEST_DATA[::-1])
self.fsck(expect_retcode=128)
assert not os.path.exists(cache_file)
# Ensure that we get updated data
self.reg_output(r'^WARNING: sqlite3: recovered [0-9]+ frames from WAL file', count=1)
self.mount()
with open(pjoin(self.mnt_dir, 'testfile'), 'rb') as fh:
assert fh.read() == TEST_DATA[::-1]
self.umount()
def upload_meta(self):
subprocess.check_call(
self.s3ql_cmd_argv('s3qlctrl') + ['--quiet', 'backup-metadata', self.mnt_dir]
)
# Check that cache is ignored if fs was mounted elsewhere
@pytest.mark.parametrize("with_fsck", (True, False))
def test_cache_flush(self, with_fsck):
# Write test data
self.mkfs()
self.mount(extra_args=['--keep-cache'])
with open(pjoin(self.mnt_dir, 'testfile'), 'wb') as fh:
fh.write(TEST_DATA)
ino = os.fstat(fh.fileno()).st_ino
self.umount()
# Taint cache file, so we'll get an error if it's re-used
cache_file = pjoin(self.cache_dir, escape(self.storage_url) + '-cache', '%d-0' % (ino,))
with open(cache_file, 'rb+') as fh:
fh.write(TEST_DATA[::-1])
# Mount elsewhere
bak = self.cache_dir
self.cache_dir = tempfile.mkdtemp(prefix='s3ql-cache-')
try:
self.mount()
with open(pjoin(self.mnt_dir, 'testfile2'), 'wb') as fh:
fh.write(b'hello')
self.umount()
finally:
shutil.rmtree(self.cache_dir)
self.cache_dir = bak
# Make sure that cache is ignored
if with_fsck:
self.fsck(args=['--keep-cache'])
self.mount()
with open(pjoin(self.mnt_dir, 'testfile'), 'rb') as fh:
assert fh.read() == TEST_DATA
self.umount()
# Check that cache is ignored if fs was mounted elsewhere
# and was not cleanly unmounted on either system
def test_cache_flush_unclean(self):
self.reg_output(r'^WARNING: Renaming outdated cache directory', count=1)
self.reg_output(r'^WARNING: You should delete this directory', count=1)
# Write test data
self.mkfs()
self.mount(extra_args=['--keep-cache'])
with open(pjoin(self.mnt_dir, 'testfile'), 'wb') as fh:
fh.write(TEST_DATA)
# Kill mount
self.flush_cache()
self.upload_meta()
# Metadata upload is not blocking, so give it some time to
# complete
time.sleep(1)
self.mount_process.kill()
self.mount_process.wait()
self.umount_fuse()
# Update cache files
cache_file = pjoin(self.cache_dir, escape(self.storage_url) + '-cache', '4-0')
with open(cache_file, 'rb+') as fh:
fh.write(TEST_DATA[::-1])
# Mount elsewhere
self.reg_output(r'^WARNING: sqlite3: recovered [0-9]+ frames from WAL file', count=1)
bak = self.cache_dir
self.cache_dir = tempfile.mkdtemp(prefix='s3ql-cache-')
try:
self.fsck(expect_retcode=0, args=['--force-remote'])
self.mount()
with open(pjoin(self.mnt_dir, 'testfile2'), 'wb') as fh:
fh.write(b'hello')
self.mount_process.kill()
self.mount_process.wait()
self.umount_fuse()
finally:
shutil.rmtree(self.cache_dir)
self.cache_dir = bak
# Make sure that cache is ignored
self.fsck(expect_retcode=0, args=['--force-remote', '--keep-cache'])
self.mount()
with open(pjoin(self.mnt_dir, 'testfile'), 'rb') as fh:
assert fh.read() == TEST_DATA
self.umount()
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