/
templates.py
170 lines (142 loc) · 5.04 KB
/
templates.py
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# -*- coding: utf-8 -*-
"""
filedesc: mako templating for our server
"""
import datetime
import config
import json
import time
from config import TEMPLATE_DIRS, MAKO_TMP_DIR
from mako.lookup import TemplateLookup
from noodles.http import Response, XMLResponse
# Specify application lookup
appLookup = TemplateLookup(
directories=TEMPLATE_DIRS,
module_directory=MAKO_TMP_DIR, output_encoding='utf-8',
input_encoding='utf-8', default_filters=['h']
)
class ContextManager(object):
"""
ContextManager class. Use contextManager object to manage your
application context
"""
def __new__(cls):
if '_inst' not in vars(cls):
cls._inst = object.__new__(cls)
return cls._inst
def __init__(self):
self.context_processors = []
self.context_constants = {}
def add_processor(self, func):
"""
Add context processor function to generate general context
Func function must return dictionary of context variables
"""
self.context_processors.append(func)
def add_constants(self, constants):
" Add dictionary of constant template variables "
self.context_constants.update(constants)
def update_context(self, context, request=None):
# Add request and config objects to context
if request:
context['request'] = request
context['config'] = config
# Update context by constants
context.update(self.context_constants)
# Update context by context processors
for processor in self.context_processors:
c = processor(request)
context.update(c)
contextManager = ContextManager()
def render_to_response(templatename, context, request=None):
rendered_page = render_to_string(templatename, context, request)
return Response(rendered_page)
def render_to_string(templatename, context=None, request=None):
" Just renders template to string "
if context is None:
context = {}
context['time'] = time
context['datetime'] = datetime.datetime
contextManager.update_context(context, request)
template = appLookup.get_template(templatename)
rendered_page = template.render(**context)
return rendered_page
class Templater(object):
" Used for direct_to_template function realization, see maputils "
_name = '__direct_templater'
@staticmethod
def render(request, templatename, **kwargs):
rendered_page = render_to_string(templatename, kwargs, request)
return Response(rendered_page)
def render_to(templatename):
"""
Specify the render_to decorator
Usage is some thing like:
@render_to
def index(request):
# some code
return some_dict # Dictionary with context variables
"""
def renderer(func):
def wrapper(**kwargs):
# Get context from the handler function
context = func(**kwargs)
if hasattr(context,'__call__'):
return context
# Add some extra values to context
request = kwargs['request'] # while it's enough :)
rendered_page = render_to_string(templatename, context, request)
return Response(rendered_page)
return wrapper
return renderer
def render_to_xml(templatename):
"""
Specify the render_to decorator
:param templatename:
Usage is some thing like:
@render_to_xml
def index(request):
# some code
return some_dict # Dictionary with context variables
"""
def renderer(func):
def wrapper(**kwargs):
# Get context from the handler function
context = func(**kwargs)
if hasattr(context,'__call__'):
return context
# Add some extra values to context
request = kwargs['request'] # while it's enough :)
rendered_page = render_to_string(templatename, context, request)
result = XMLResponse(rendered_page)
return result
return wrapper
return renderer
def render_or_json(templatename):
"""
Specify the render_or_json decorator
Usage - some thing like this
@render_or_json
def index(request):
# some code
return some_dict # Dictionary with context variables
"""
def renderer(func):
def wrapper(**kwargs):
# Get context from the handler function
context = func(**kwargs)
if hasattr(context,'__call__'):
return context
# Add some extra values to context
request = kwargs['request'] # while it's enough :)
if 'GET' == request.method:
rendered_page = render_to_string(templatename,
context,
request)
return Response(rendered_page)
else:
response = Response(json.dumps(context))
response.headerlist = [('Content-type', 'application/json')]
return response
return wrapper
return renderer