自定义模板加载器Django [英] custom template loader Django

问题描述

我正在尝试在django中编写一个自定义模板加载器，该加载器提供s3存储桶中存在的index.html.以下是我的加载器文件

i am trying to write a custom template loader in django which serves index.html which is present in a s3 bucket. Following is my loader file

from django.conf import settings
from django.template import Origin, Engine
from django.template.loader import TemplateDoesNotExist
from django.template.loaders.base import Loader
from boto3.session import Session

ACCESS_KEY_NAME = getattr(settings, 'AWS_TEMPLATE_LOADING_ACCESS_KEY_ID', getattr(settings, 'AWS_TEMPLATE_LOADING_ACCESS_KEY_ID', None))
SECRET_KEY_NAME = getattr(settings, 'AWS_TEMPLATE_LOADING_SECRET_ACCESS_KEY', getattr(settings, 'AWS_TEMPLATE_LOADING_SECRET_ACCESS_KEY', None))
TEMPLATE_BUCKET = getattr(settings, 'AWS_TEMPLATE_BUCKET_NAME')


class Loader(Loader):
    is_usable = True

    def __init__(self, *args, **kwargs):
        params = args[0]
        options = params.pop('OPTIONS').copy()
        options.setdefault('autoescape', True)
        options.setdefault('debug', settings.DEBUG)
        options.setdefault('file_charset', settings.FILE_CHARSET)
        libraries = options.get('libraries', {})
        session = Session(aws_access_key_id=ACCESS_KEY_NAME,
                          aws_secret_access_key=SECRET_KEY_NAME)
        s3 = session.resource('s3')
        self.bucket = s3.Bucket(TEMPLATE_BUCKET)
        super(Loader, self).__init__(*args, **kwargs)
        self.engine = Engine(dirs=params['DIRS'], context_processors=options, loaders=Loader)

    def getKeys(self):
        keys_objects = []
        for obj in self.bucket.objects.all():
            key = obj.key
            keys_objects.append({
                'key': key,
                'object': obj
            })
        return keys_objects

    def get_contents(self, origin):
        try:
            keys_objects = self.getKeys()
            for key_object in keys_objects:
                if key_object['key'] == origin:
                    return key_object['object'].get()['Body'].read()
        except FileNotFoundError:
            raise TemplateDoesNotExist(origin)


    def get_template_sources(self, template_name, template_dirs=None):
        tried = []
        yield Origin(
            name=template_name,
            template_name=template_name,
            loader=self,
        )
        tried.append('/index.html')
        if tried:
            error_msg = "Tried Keys %s" % tried
        else:
            error_msg = "Your TEMPLATE_DIRS setting is empty. Change it to point to at least one template directory."
        raise TemplateDoesNotExist(error_msg)

    get_template_sources.is_usable = True

，在我的设置中，我已经按照以下方式设置了模板设置.

and in my settings i have set the template settings in following way.

TEMPLATES = [
    {
        'BACKEND': 'app.s3template_loader.Loader',
        'DIRS': [
            'index.html'
        ],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    }
]

以下是我的观点

from django.shortcuts import render
from django.views.generic import TemplateView

# Create your views here.


class AngularAppView(TemplateView):
    template_name = 'index.html'

但是当我尝试进入终点时，我会得到

but when i am trying to acces my end point i am getting

内部服务器错误:/追溯(最近一次呼叫最近):文件"/usr/local/lib/python3.6/site-packages/django/core/handlers/exception.py"，第41行，在内部response = get_response(request)文件"/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py"，_get_response中的第217行响应= self.process_exception_by_middleware(e，request)文件"/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py"，_get_response中的第215行response = response.render()文件"/usr/local/lib/python3.6/site-packages/django/template/response.py"，第107行，在渲染中self.content = self.rendered_content文件"/usr/local/lib/python3.6/site-packages/django/template/response.py"，第84行，在render_content中content = template.render(context，self._request)TypeError:render()接受2个位置参数，但给出了3个

Internal Server Error: / Traceback (most recent call last): File "/usr/local/lib/python3.6/site-packages/django/core/handlers/exception.py", line 41, in inner response = get_response(request) File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py", line 217, in _get_response response = self.process_exception_by_middleware(e, request) File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py", line 215, in _get_response response = response.render() File "/usr/local/lib/python3.6/site-packages/django/template/response.py", line 107, in render self.content = self.rendered_content File "/usr/local/lib/python3.6/site-packages/django/template/response.py", line 84, in rendered_content content = template.render(context, self._request) TypeError: render() takes 2 positional arguments but 3 were given

我找不到我做错的事情.任何帮助表示赞赏.

i am not able to find what i am doing wrong. any help is appreciated.

推荐答案

您构建了一个加载程序，但是您将其用作后端/引擎.试试这个配置:

You built a loader, but you are using it as backend/engine. Try this config:

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [
            'index.html'
        ],
        'APP_DIRS': True,
        'OPTIONS': {
            'loaders': ['app.s3template_loader.Loader'],
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
        },
    }
]

请注意，设置 OPTIONS ['loaders'] 将禁用缓存.请参阅 cached加载程序 .

Note that setting OPTIONS['loaders'] will disable caching. See docs on cached.Loader.

这篇关于自定义模板加载器Django的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！