mirror of
https://github.com/wassname/catalyst.git
synced 2026-06-30 18:49:42 +08:00
fawce
52 lines
1.3 KiB
Python
52 lines
1.3 KiB
Python
"""
|
|
Small classes to assist with timezone calculations, LOGGER configuration,
|
|
and other common operations.
|
|
"""
|
|
|
|
|
|
import logging
|
|
import logging.config
|
|
from os.path import join, abspath, dirname
|
|
|
|
def configure_logging():
|
|
logging.config.fileConfig(
|
|
logger_path(),
|
|
disable_existing_loggers = False
|
|
)
|
|
|
|
def logger_path():
|
|
import zipline
|
|
log_path = dirname(abspath(zipline.__file__))
|
|
return join(log_path, 'logging.cfg')
|
|
|
|
|
|
# utility for tailing a log file.
|
|
def tail( f, window=20 ):
|
|
"""
|
|
from
|
|
http://stackoverflow.com/questions/136168/get-last-n-lines-of-a-file- \
|
|
with-python-similar-to-tail
|
|
"""
|
|
BUFSIZ = 1024
|
|
f.seek(0, 2)
|
|
bytes = f.tell()
|
|
size = window
|
|
block = -1
|
|
data = []
|
|
while size > 0 and bytes > 0:
|
|
if (bytes - BUFSIZ > 0):
|
|
# Seek back one whole BUFSIZ
|
|
f.seek(block*BUFSIZ, 2)
|
|
# read BUFFER
|
|
data.append(f.read(BUFSIZ))
|
|
else:
|
|
# file too small, start from begining
|
|
f.seek(0,0)
|
|
# only read what was not read
|
|
data.append(f.read(bytes))
|
|
linesFound = data[-1].count('\n')
|
|
size -= linesFound
|
|
bytes -= BUFSIZ
|
|
block -= 1
|
|
return '\n'.join(''.join(data).splitlines()[-window:])
|