def append_reload_and_write(self, s, filename, encoding):
if not self.hist_size:
return self.append(s)
try:
with codecs.open(filename, 'a+', encoding, 'ignore') as hfile:
with FileLock(hfile):
# read entries
hfile.seek(0, os.SEEK_SET)
entries = self.load_from(hfile)
self.append_to(entries, s)
# write new entries
hfile.seek(0, os.SEEK_SET)
hfile.truncate()
self.save_to(hfile, entries, self.hist_size)
self.entries = entries
except EnvironmentError as err:
raise RuntimeError(
_('Error occurred while writing to file %s (%s)') %
(filename, err.strerror))
else:
if len(self.entries) == 0:
# Make sure that entries contains at least one element. If the
# file and s are empty, this can occur.
self.entries = ['']
def save(self, filename, encoding, lines=0):
fd = os.open(filename, os.O_WRONLY | os.O_CREAT | os.TRUNC,
stat.S_IRUSR | stat.S_IWUSR)
with io.open(fd, 'w', encoding=encoding,
errors='ignore') as hfile:
with FileLock(hfile):
self.save_to(hfile, self.entries, lines)
def save(self, filename, encoding, lines=0):
with codecs.open(filename, 'w', encoding, 'ignore') as hfile:
with FileLock(hfile):
self.save_to(hfile, self.entries, lines)
def load(self, filename, encoding):
with codecs.open(filename, 'r', encoding, 'ignore') as hfile:
with FileLock(hfile):
self.entries = self.load_from(hfile)
def load(self, filename, encoding):
with io.open(filename, 'r', encoding=encoding,
errors='ignore') as hfile:
with FileLock(hfile):
self.entries = self.load_from(hfile)