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import logging
import logging.config # needed when logging_config doesn't start with logging.config
import warnings
from copy import copy
from django.conf import settings
from django.core import mail
from django.core.exceptions import ImproperlyConfigured
from django.core.management.color import color_style
from django.utils.deprecation import RemovedInDjango70Warning
from django.utils.module_loading import import_string
from django.utils.warnings import django_file_prefixes
request_logger = logging.getLogger("django.request")
# Default logging for Django. This sends an email to the site admins on every
# HTTP 500 error. Depending on DEBUG, all other log records are either sent to
# the console (DEBUG=True) or discarded (DEBUG=False) by means of the
# require_debug_true filter. This configuration is quoted in
# docs/ref/logging.txt; please amend it there if edited here.
DEFAULT_LOGGING = {
"version": 1,
"disable_existing_loggers": False,
"filters": {
"require_debug_false": {
"()": "django.utils.log.RequireDebugFalse",
},
"require_debug_true": {
"()": "django.utils.log.RequireDebugTrue",
},
},
"formatters": {
"django.server": {
"()": "django.utils.log.ServerFormatter",
"format": "[{server_time}] {message}",
"style": "{",
}
},
"handlers": {
"console": {
"level": "INFO",
"filters": ["require_debug_true"],
"class": "logging.StreamHandler",
},
"django.server": {
"level": "INFO",
"class": "logging.StreamHandler",
"formatter": "django.server",
},
"mail_admins": {
"level": "ERROR",
"filters": ["require_debug_false"],
"class": "django.utils.log.AdminEmailHandler",
},
},
"loggers": {
"django": {
"handlers": ["console", "mail_admins"],
"level": "INFO",
},
"django.server": {
"handlers": ["django.server"],
"level": "INFO",
"propagate": False,
},
},
}
def configure_logging(logging_config, logging_settings):
if logging_config:
# First find the logging configuration function …
logging_config_func = import_string(logging_config)
logging.config.dictConfig(DEFAULT_LOGGING)
# … then invoke it with the logging settings
if logging_settings:
logging_config_func(logging_settings)
class AdminEmailHandler(logging.Handler):
"""An exception log handler that emails log entries to site admins.
If the request is passed as the first argument to the log record,
request data will be provided in the email report.
"""
def __init__(
self, include_html=False, email_backend=None, reporter_class=None, using=None
):
super().__init__()
# RemovedInDjango70Warning: email_backend arg and connection error.
if email_backend:
if using:
raise ImproperlyConfigured(
"The 'email_backend' argument is not compatible with 'using'."
)
if mail.mailers._is_configured:
raise ImproperlyConfigured(
"The 'email_backend' argument is not valid when "
"settings.MAILERS is defined."
)
warnings.warn(
"The 'email_backend' argument is deprecated. Use 'using' instead.",
RemovedInDjango70Warning,
skip_file_prefixes=django_file_prefixes(),
)
if hasattr(self, "connection"):
raise AttributeError(
"The undocumented AdminEmailHandler.connection() method is no longer "
"used."
)
self.include_html = include_html
self.email_backend = email_backend
self.using = using
self.reporter_class = import_string(
reporter_class or settings.DEFAULT_EXCEPTION_REPORTER
)
def emit(self, record):
# Early return when no email will be sent.
if (
not settings.ADMINS
# Method not overridden.
and self.send_mail.__func__ is AdminEmailHandler.send_mail
):
return
try:
request = record.request
subject = "%s (%s IP): %s" % (
record.levelname,
(
"internal"
if request.META.get("REMOTE_ADDR") in settings.INTERNAL_IPS
else "EXTERNAL"
),
record.getMessage(),
)
except Exception:
subject = "%s: %s" % (record.levelname, record.getMessage())
request = None
subject = self.format_subject(subject)
# Since we add a nicely formatted traceback on our own, create a copy
# of the log record without the exception data.
no_exc_record = copy(record)
no_exc_record.exc_info = None
no_exc_record.exc_text = None
if record.exc_info:
exc_info = record.exc_info
else:
exc_info = (None, record.getMessage(), None)
reporter = self.reporter_class(request, is_email=True, *exc_info)
message = "%s\n\n%s" % (
self.format(no_exc_record),
reporter.get_traceback_text(),
)
html_message = reporter.get_traceback_html() if self.include_html else None
self.send_mail(subject, message, html_message=html_message)
def send_mail(self, subject, message, *args, **kwargs):
# RemovedInDjango70Warning.
if not mail.mailers._is_configured:
connection = mail.get_connection(
backend=self.email_backend, fail_silently=True
)
mail.mail_admins(subject, message, *args, connection=connection, **kwargs)
return
try:
mail.mail_admins(subject, message, *args, using=self.using, **kwargs)
except mail.MailerDoesNotExist:
pass
def format_subject(self, subject):
"""
Escape CR and LF characters.
"""
return subject.replace("\n", "\\n").replace("\r", "\\r")
class CallbackFilter(logging.Filter):
"""
A logging filter that checks the return value of a given callable (which
takes the record-to-be-logged as its only parameter) to decide whether to
log a record.
"""
def __init__(self, callback):
self.callback = callback
def filter(self, record):
if self.callback(record):
return 1
return 0
class RequireDebugFalse(logging.Filter):
def filter(self, record):
return not settings.DEBUG
class RequireDebugTrue(logging.Filter):
def filter(self, record):
return settings.DEBUG
class ServerFormatter(logging.Formatter):
default_time_format = "%d/%b/%Y %H:%M:%S"
def __init__(self, *args, **kwargs):
self.style = color_style()
super().__init__(*args, **kwargs)
def format(self, record):
msg = record.msg
status_code = getattr(record, "status_code", None)
if status_code:
if 200 <= status_code < 300:
# Put 2XX first, since it should be the common case
msg = self.style.HTTP_SUCCESS(msg)
elif 100 <= status_code < 200:
msg = self.style.HTTP_INFO(msg)
elif status_code == 304:
msg = self.style.HTTP_NOT_MODIFIED(msg)
elif 300 <= status_code < 400:
msg = self.style.HTTP_REDIRECT(msg)
elif status_code == 404:
msg = self.style.HTTP_NOT_FOUND(msg)
elif 400 <= status_code < 500:
msg = self.style.HTTP_BAD_REQUEST(msg)
else:
# Any 5XX, or any other status code
msg = self.style.HTTP_SERVER_ERROR(msg)
if self.uses_server_time() and not hasattr(record, "server_time"):
record.server_time = self.formatTime(record, self.datefmt)
record.msg = msg
return super().format(record)
def uses_server_time(self):
return self._fmt.find("{server_time}") >= 0
def log_message(
logger,
message,
*args,
level=None,
status_code=None,
request=None,
exception=None,
**extra,
):
"""Log `message` using `logger` based on `status_code` and logger `level`.
Pass `request`, `status_code` (if defined) and any provided `extra` as such
to the logging method,
Arguments from `args` will be escaped to avoid potential log injections.
"""
extra = {"request": request, **extra}
if status_code is not None:
extra["status_code"] = status_code
if level is None:
if status_code >= 500:
level = "error"
elif status_code >= 400:
level = "warning"
escaped_args = tuple(
a.encode("unicode_escape").decode("ascii") if isinstance(a, str) else a
for a in args
)
getattr(logger, level or "info")(
message,
*escaped_args,
extra=extra,
exc_info=exception,
)
def log_response(
message,
*args,
response=None,
request=None,
logger=request_logger,
level=None,
exception=None,
):
"""
Log errors based on HttpResponse status.
Log 5xx responses as errors and 4xx responses as warnings (unless a level
is given as a keyword argument). The HttpResponse status_code and the
request are passed to the logger's extra parameter.
"""
# Check if the response has already been logged. Multiple requests to log
# the same response can be received in some cases, e.g., when the
# response is the result of an exception and is logged when the exception
# is caught, to record the exception.
if getattr(response, "_has_been_logged", False):
return
log_message(
logger,
message,
*args,
level=level,
status_code=response.status_code,
request=request,
exception=exception,
)
response._has_been_logged = True
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