def testExistFile__readfile(self):
""" common.readfile: returns contents for existing files.
"""
# text file
data = 'this is a test' + os.linesep
filename = self.make_file(data)
self.assertEqual(common.readfile(filename, binary=False), data)
# binary file
data = '\x00\x12\x34\x56\x78'
filename = self.make_file(data)
self.assertEqual(common.readfile(filename, binary=True), data)
def testExistFile__readfile(self):
""" common.readfile: returns contents for existing files.
"""
# text file
data = 'this is a test' + os.linesep
filename = self.make_file(data)
self.assertEqual(common.readfile(filename, binary=False), data)
# binary file
data = '\x00\x12\x34\x56\x78'
filename = self.make_file(data)
self.assertEqual(common.readfile(filename, binary=True), data)
def _clean_prior(self):
""" Cleans up from a previous task that didn't exit cleanly.
Returns ``True`` if previous task was cleaned.
"""
if self._loaded:
try:
pid_file = daemon.get_daemon_pidfile(self)
# check if it exists so we don't raise
if os.path.isfile(pid_file):
# read pid from file
pid = int(common.readfile(pid_file))
# check if pid file is stale
if pid and not daemon.pid_exists(pid):
common.safe_remove_file(pid_file)
raise ValueError
except (ValueError, TypeError):
self._clean()
return True
return False
def _clean_prior(self):
""" Cleans up from a previous task that didn't exit cleanly.
Returns ``True`` if previous task was cleaned.
"""
if self._loaded:
try:
pid_file = daemon.get_daemon_pidfile(self)
# check if it exists so we don't raise
if os.path.isfile(pid_file):
# read pid from file
pid = int(common.readfile(pid_file))
# check if pid file is stale
if pid and not daemon.pid_exists(pid):
common.safe_remove_file(pid_file)
raise ValueError
except (ValueError, TypeError):
self._clean()
return True
return False
def testNotExistFile__readfile(self):
""" common.readfile: returns ``None`` for non-existent files.
"""
filename = self.make_file()
self.clean_paths(filename)
self.assertIsNone(common.readfile(filename))
def _handle_block(self, task, disable=False):
""" Handles blocking domains using hosts file.
`task`
``Task`` instance.
`disable`
Set to ``True``, to turn off blocking and restore hosts file;
otherwise, ``False`` will enable blocking by updating hosts
file.
Returns boolean.
"""
backup_file = os.path.join(task.task_dir, '.hosts.bak')
self.orig_data = self.orig_data or common.readfile(backup_file)
self.last_updated = self.last_updated or -1
if not self.orig_data:
# should't attempt restore without good original data, bail
if disable:
return False
# attempt to fetch data from the source
self.orig_data = common.readfile(self.hosts_file)
if not self.orig_data:
return False
# restore backup
if not os.path.exists(backup_file):
common.writefile(backup_file, self.orig_data)
# bail early if hosts file modification time hasn't changed
try:
should_write = (disable or self.last_updated
!= os.path.getmtime(self.hosts_file))
except OSError:
should_write = True # file was removed, let's write!
if not should_write:
return True
# make copy of original data, in case we need to modify
data = self.orig_data
# if not restoring, tack on domains mapped
# to localhost to end of file data
if not disable:
# convert the set to a list and sort
domains = list(self.domains)
domains.sort()
data += ('\n'.join('127.0.0.1\t{0}\t# FOCUS'
.format(d) for d in domains) + '\n')
# make temp file with new host file data
with tempfile.NamedTemporaryFile(prefix='focus_') as tempf:
tempf.write(data)
tempf.flush()
# overwrite hosts file with our modified copy.
if not self.run_root('cp "{0}" "{1}"'.format(tempf.name,
self.hosts_file)):
return False
# MacOS X generally requires flushing the system dns cache to pick
# up changes to the hosts file:
# dscacheutil -flushcache or lookupd -flushcache
if common.IS_MACOSX:
dscacheutil, lookupd = [common.which(x) for x in
('dscacheutil', 'lookupd')]
self.run_root(' '.join([dscacheutil or lookupd,
'-flushcache']))
if disable:
common.safe_remove_file(backup_file) # cleanup the backup
# store last modification time
try:
self.last_updated = os.path.getmtime(self.hosts_file)
except OSError:
# file was removed, let's update next time around
self.last_updated = -1
return True
def testNotExistFile__readfile(self):
""" common.readfile: returns ``None`` for non-existent files.
"""
filename = self.make_file()
self.clean_paths(filename)
self.assertIsNone(common.readfile(filename))
def _handle_block(self, task, disable=False):
""" Handles blocking domains using hosts file.
`task`
``Task`` instance.
`disable`
Set to ``True``, to turn off blocking and restore hosts file;
otherwise, ``False`` will enable blocking by updating hosts
file.
Returns boolean.
"""
backup_file = os.path.join(task.task_dir, '.hosts.bak')
self.orig_data = self.orig_data or common.readfile(backup_file)
self.last_updated = self.last_updated or -1
if not self.orig_data:
# should't attempt restore without good original data, bail
if disable:
return False
# attempt to fetch data from the source
self.orig_data = common.readfile(self.hosts_file)
if not self.orig_data:
return False
# restore backup
if not os.path.exists(backup_file):
common.writefile(backup_file, self.orig_data)
# bail early if hosts file modification time hasn't changed
try:
should_write = (
disable
or self.last_updated != os.path.getmtime(self.hosts_file))
except OSError:
should_write = True # file was removed, let's write!
if not should_write:
return True
# make copy of original data, in case we need to modify
data = self.orig_data
# if not restoring, tack on domains mapped
# to localhost to end of file data
if not disable:
# convert the set to a list and sort
domains = list(self.domains)
domains.sort()
data += ('\n'.join('127.0.0.1\t{0}\t# FOCUS'.format(d)
for d in domains) + '\n')
# make temp file with new host file data
with tempfile.NamedTemporaryFile(prefix='focus_') as tempf:
tempf.write(data)
tempf.flush()
# overwrite hosts file with our modified copy.
if not self.run_root('cp "{0}" "{1}"'.format(
tempf.name, self.hosts_file)):
return False
# MacOS X generally requires flushing the system dns cache to pick
# up changes to the hosts file:
# dscacheutil -flushcache or lookupd -flushcache
if common.IS_MACOSX:
dscacheutil, lookupd = [
common.which(x) for x in ('dscacheutil', 'lookupd')
]
self.run_root(' '.join([dscacheutil or lookupd,
'-flushcache']))
if disable:
common.safe_remove_file(backup_file) # cleanup the backup
# store last modification time
try:
self.last_updated = os.path.getmtime(self.hosts_file)
except OSError:
# file was removed, let's update next time around
self.last_updated = -1
return True
