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# Copyright (C) 2017 Lars Wirzenius
import slog
def drop_get_message(log_obj):
# These are useless and annoying in gunicorn log messages.
if 'getMessage' in log_obj:
del log_obj['getMessage']
return log_obj
# We are probably run under gunicorn, which sets up logging via the
# logging library. Hijack that so actual logging happens via the slog
# library. For this, we need to know the logger names gunicorn uses.
gunicorn_loggers = ['gunicorn.access', 'gunicorn.error']
# This sets up a global log variable that doesn't actually log
# anything anywhere. This is useful so that code can unconditionally
# call log.log(...) from anywhere. See setup_logging() for setting up
# actual logging to somewhere persistent.
log = slog.StructuredLog()
log.add_log_writer(slog.NullSlogWriter(), slog.FilterAllow())
log.add_log_massager(drop_get_message)
slog.hijack_logging(log, logger_names=gunicorn_loggers)
def setup_logging(config):
if 'log' in config:
assert isinstance(config['log'], list)
for target in config.get('log', []):
setup_logging_to_target(target)
def setup_logging_to_target(target):
rule = get_filter_rules(target)
if 'filename' in target:
setup_logging_to_file(target, rule)
else:
raise Exception('Do not understand logging target %r' % target)
def get_filter_rules(target):
if 'filter' in target:
return slog.construct_log_filter(target['filter'])
return slog.FilterAllow()
def setup_logging_to_file(target, rule):
writer = slog.FileSlogWriter()
writer.set_filename(target['filename'])
if 'max_bytes' in target:
writer.set_max_file_size(target['max_bytes'])
log.add_log_writer(writer, rule)
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