![](/img/trans.png)
[英]How to get the level of the logging record in a custom logging.Handler in Python?
[英]python when is logging.Handler flush-method called?
這是我的自定義日志處理程序
import logging
import datetime
from my_app.models import MyModel
class DbLogHandler(logging.Handler): # Inherit from logging.Handler
def __init__(self):
# run the regular Handler __init__
logging.Handler.__init__(self)
self.entries = []
print("*****************[DB] INIT db handler")
def emit(self, record):
# instantiate the model
print("@@@@@@@@@@@@@@@@@@@@", self.__hash__())
print("*****************[DB] called emit on db handler")
print("*****************[DB] entries has {0:d} entries "
"now".format(len(self.entries)))
# print("*****************[DB] current record is {}".format(record.__dict__))
try:
revision_instance = getattr(record, 'revision', None)
logEntry = MyModel(name=record.name,
log_level_name=record.levelname,
message = record.msg,
module = record.module,
func_name = record.funcName,
line_no = record.lineno,
exception = record.exc_text,
revision = revision_instance
)
if revision_instance is None:
return
self.entries.append(logEntry)
print("[+] entries has {0:d} entries "
"now".format(len(self.entries)))
except Exception as ex:
print(ex)
return
def flush(self):
print("************************[*] Flushing {0:d} entries".format(len(self.entries)))
if self.entries:
MyModel.objects.bulk_create(self.entries)
print("************************[+] Successfully flushed {0:d} log entries to "
"the DB".format(len(self.entries)))
else:
print("************************[*] No log entries for DB logger")
我的日志文件告訴我這個
[2015-09-18 15:12:51,367: WARNING/Worker-2] [+] entries has 3 entries now
[2015-09-18 15:12:51,366: DEBUG/Worker-2] threedi_inpy.tasks.generate_inp_files[None]: {}
[2015-09-18 15:12:51,367: WARNING/Worker-2] @@@@@@@@@@@@@@@@@@@@
[2015-09-18 15:12:51,367: WARNING/Worker-2] 6865789
[2015-09-18 15:12:51,367: WARNING/Worker-2] *****************[DB] called emit on db handler
[2015-09-18 15:12:51,367: WARNING/Worker-2] *****************[DB] entries has 3 entries now
[2015-09-18 15:12:51,367: WARNING/Worker-2] [+] entries has 4 entries now
[2015-09-18 15:12:51,367: INFO/Worker-2] threedi_inpy.tasks.generate_inp_files[None]: [*] Trying to make_sqlite_models_entry for now
[2015-09-18 15:12:51,368: WARNING/Worker-2] @@@@@@@@@@@@@@@@@@@@
[2015-09-18 15:12:51,368: WARNING/Worker-2] 5511201
[2015-09-18 15:12:51,368: WARNING/Worker-2] *****************[DB] called emit on db handler
[2015-09-18 15:12:51,368: WARNING/Worker-2] *****************[DB] entries has 0 entries now
[2015-09-18 15:12:51,368: INFO/Worker-2] threedi_inpy.tasks.generate_inp_files[None]: Skipped directory /srv/var/models/lars_test/test9967b6-52ee-11e5-940c-0050569e25test92/.hg
[2015-09-18 15:12:51,368: WARNING/Worker-2] @@@@@@@@@@@@@@@@@@@@
[2015-09-18 15:12:51,369: WARNING/Worker-2] 5511201
[2015-09-18 15:12:51,369: WARNING/Worker-2] *****************[DB] called emit on db handler
[2015-09-18 15:12:51,369: WARNING/Worker-2] *****************[DB] entries has 0 entries now
flush
方法永遠不會被調用,因此我的條目將丟失。 因此,我的第一個問題是: flush()
何時被調用? 或者,我如何批量寫入數據庫而不是每次發出?
您基本上是在嘗試編寫MemoryHandler
它是一個將記錄存儲在內存中的處理程序,並在達到最大容量或記錄某個級別時調用flush
。 然后flush
會將記錄發送到target
處理程序,該處理程序可能是您的數據庫處理程序。
flush
確實沒有在基本處理程序中調用,它只是在 API 中定義,由子類決定如何以及是否調用它。 它被調用的唯一情況是在調用logging.shutdown
時。
例如, MemoryHandler
在發出(繼承自BufferingHandler
)中執行此操作:
def emit(self, record):
"""
Emit a record.
Append the record. If shouldFlush() tells us to, call flush() to process
the buffer.
"""
self.buffer.append(record)
if self.shouldFlush(record):
self.flush()
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.