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import os
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import json
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from django.conf import settings, UserSettingsHolder
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from tenant_schemas.middleware import TenantMiddleware
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SENTINEL = object()
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class EOTenantMiddleware(TenantMiddleware):
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def __init__(self, *args, **kwargs):
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self.wrapped = settings._wrapped
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def process_request(self, request):
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super(EOTenantMiddleware, self).process_request(request)
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override = UserSettingsHolder(self.wrapped)
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for client_settings in request.tenant.clientsetting_set.all():
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setattr(override, client_settings.name, client_settings.json)
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settings._wrapped = override
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def process_response(self, request, response):
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settings._wrapped = self.wrapped
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return response
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class TenantSettingBaseMiddleware(object):
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'''Base middleware classe for loading settings based on tenants
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Child classes MUST override the load_tenant_settings() method.
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'''
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def __init__(self, *args, **kwargs):
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self.tenants_settings = {}
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def get_tenant_settings(self, wrapped, tenant):
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'''Get last loaded settings for tenant, try to update it by loading
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settings again is last loading time is less recent thant settings data
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store. Compare with last modification time is done in the
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load_tenant_settings() method.
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'''
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tenant_settings, last_time = self.tenants_settings.get(tenant.schema_name, (None,None))
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if tenant_settings is None:
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tenant_settings = UserSettingsHolder(wrapped)
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tenant_settings, last_time = self.load_tenant_settings(wrapped, tenant, tenant_settings, last_time)
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self.tenants_settings[tenant.schema_name] = tenant_settings, last_time
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return tenant_settings
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def load_tenant_settings(self, wrapped, tenant, tenant_settings, last_time):
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'''Load tenant settings into tenant_settings object, eventually skip if
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last_time is more recent than last update time for settings and return
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the new value for tenant_settings and last_time'''
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raise NotImplemented
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def process_request(self, request):
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if not hasattr(request, '_old_settings_wrapped'):
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request._old_settings_wrapped = []
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request._old_settings_wrapped.append(settings._wrapped)
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settings._wrapped = self.get_tenant_settings(settings._wrapped, request.tenant)
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def process_response(self, request, response):
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if hasattr(request, '_old_settings_wrapped') and request._old_settings_wrapped:
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settings._wrapped = request._old_settings_wrapped.pop()
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return response
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class FileBasedTenantSettingBaseMiddleware(TenantSettingBaseMiddleware):
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FILENAME = None
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def load_tenant_settings(self, wrapped, tenant, tenant_settings, last_time):
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path = os.path.join(settings.TENANT_BASE, tenant.schema_name, self.FILENAME)
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try:
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new_time = os.stat(path).st_mtime
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except OSError:
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# file was removed
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if not last_time is None:
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return UserSettingsHolder(wrapped), None
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else:
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if last_time is None or new_time >= last_time:
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# file is new
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tenant_settings = UserSettingsHolder(wrapped)
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self.load_file(tenant_settings, path)
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return tenant_settings, new_time
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# nothing has changed
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return tenant_settings, last_time
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class JSONSettingsMiddleware(FileBasedTenantSettingBaseMiddleware):
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'''Load settings from a JSON file whose path is given by:
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os.path.join(settings.TENANT_BASE % schema_name, 'settings.json')
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The JSON file must be a dictionnary whose key/value will override
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current settings.
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'''
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FILENAME = 'settings.json'
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def load_file(sef, tenant_settings, path):
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with file(path) as f:
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json_settings = json.load(f)
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for key in json_settings:
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setattr(tenant_settings, key, json_settings[key])
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class DictAdapter(dict):
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'''Give dict interface to plain objects'''
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def __init__(self, wrapped):
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self.wrapped = wrapped
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def __setitem__(self, key, value):
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setattr(self.wrapped, key, value)
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def __getitem__(self, key):
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try:
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return getattr(self.wrapped, key)
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except AttributeError:
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raise KeyError
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class PythonSettingsMiddleware(JSONSettingsMiddleware):
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'''Load settings from a file whose path is given by:
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os.path.join(settings.TENANT_BASE % schema_name, 'settings.py')
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The file is executed in the same context as the classic settings file
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using execfile.
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'''
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FILENAME = 'settings.py'
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def load_file(self, tenant_settings, path):
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execfile(path, DictAdapter(tenant_settings))
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