from django.contrib.messages import constants
from django.contrib.messages.storage import default_storage
from django.utils.functional import lazy,memoize
__all__ = (
'add_message', 'get_messages',
'get_level', 'set_level',
'debug', 'info', 'success', 'warning', 'error',
)
class MessageFailure(Exception):
pass
def add_message(request, level, message, extra_tags='', fail_silently=False):
"""
Attempts to add a message to the request using the 'messages' app, falling
back to the user's message_set if MessageMiddleware hasn't been enabled.
"""
if hasattr(request, '_messages'):
return request._messages.add(level, message, extra_tags)
if hasattr(request, 'user') and request.user.is_authenticated():
return request.user.message_set.create(message=message)
if not fail_silently:
raise MessageFailure('Without the django.contrib.messages '
'middleware, messages can only be added to '
'authenticated users.')
def get_messages(request):
"""
Returns the message storage on the request if it exists, otherwise returns
user.message_set.all() as the old auth context processor did.
"""
if hasattr(request, '_messages'):
return request._messages
def get_user():
if hasattr(request, 'user'):
return request.user
else:
from django.contrib.auth.models import AnonymousUser
return AnonymousUser()
return lazy(memoize(get_user().get_and_delete_messages, {}, 0), list)()
def get_level(request):
"""
Returns the minimum level of messages to be recorded.
The default level is the ``MESSAGE_LEVEL`` setting. If this is not found,
the ``INFO`` level is used.
"""
if hasattr(request, '_messages'):
storage = request._messages
else:
storage = default_storage(request)
return storage.level
def set_level(request, level):
"""
Sets the minimum level of messages to be recorded, returning ``True`` if
the level was recorded successfully.
If set to ``None``, the default level will be used (see the ``get_level``
method).
"""
if not hasattr(request, '_messages'):
return False
request._messages.level = level
return True
def debug(request, message, extra_tags='', fail_silently=False):
"""
Adds a message with the ``DEBUG`` level.
"""
add_message(request, constants.DEBUG, message, extra_tags=extra_tags,
fail_silently=fail_silently)
def info(request, message, extra_tags='', fail_silently=False):
"""
Adds a message with the ``INFO`` level.
"""
add_message(request, constants.INFO, message, extra_tags=extra_tags,
fail_silently=fail_silently)
def success(request, message, extra_tags='', fail_silently=False):
"""
Adds a message with the ``SUCCESS`` level.
"""
add_message(request, constants.SUCCESS, message, extra_tags=extra_tags,
fail_silently=fail_silently)
def warning(request, message, extra_tags='', fail_silently=False):
"""
Adds a message with the ``WARNING`` level.
"""
add_message(request, constants.WARNING, message, extra_tags=extra_tags,
fail_silently=fail_silently)
def error(request, message, extra_tags='', fail_silently=False):
"""
Adds a message with the ``ERROR`` level.
"""
add_message(request, constants.ERROR, message, extra_tags=extra_tags,
fail_silently=fail_silently)
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