web project (1st day)

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what should we do before start our web project

First–install what we need

Ensure which technologies will be used
think about all of them, such as DATABASE, CACHE, WEB FRAMEWORK, CELERY …
so: In python there is we need:
pip install Django
pip install django_redis
pip install redis
pip install celery
pip install pymysql
pip install pillow ===> for image code verification
…. that is now we need, and than we can extension them

Second–Structure is important than you think

Now, We need talk about the Django project
what application will be support?
what we do is good for the project? maybe docs?log?scripts?
how to manage the project?
how to realize ‘celery’?
….
think above all of them, we can deal with them like this:
│ ├── celery_tasks # execute asynchronous tasks
│ ├── docs # project docs
│ ├── logs # project exception log
│ │ └── meiduo.log
│ ├── manage.py
│ └── meiduo_mall
│ ├── apps # applications moudle
│ ├── libs # Third-party libraries
│ ├── settings # online or develop setting
│ │ ├── dev.py
│ │ ├── init.py
│ │ ├── prod.py
│ │ └── pycache
│ │ ├── dev.cpython-36.pyc
│ │ └── init.cpython-36.pyc
│ ├── settings_old.py
│ ├── urls.py
│ ├── utils # SDK support
│ │ ├── exceptions.py
│ │ └── init.py
│ └── wsgi.py

Third–Setting for better programing environment

questions:
how to sava exceptions log?
how connect databases?
how to realize asynchronous tasks?
how to location project easily?
how to handler exception?

now, deal with all questions?
1. sys.path

sys.path.insert(0, os.path.join(BASE_DIR, 'apps'))

1. database setting ===> it’s easy
2. Setting django-redis for asynchronous tasks

ACHES = {"default": {"BACKEND": "django_redis.cache.RedisCache","LOCATION": "redis://127.0.0.1:6379/0","OPTIONS": {"CLIENT_CLASS": "django_redis.client.DefaultClient",}},"session": {"BACKEND": "django_redis.cache.RedisCache","LOCATION": "redis://127.0.0.1:6379/1","OPTIONS": {"CLIENT_CLASS": "django_redis.client.DefaultClient",}}
}
SESSION_ENGINE = 'django.contrib.sessions.backends.db' # 数据库引擎设置
SESSION_CACHE_ALIAS= 'session'  # 使用的缓存数据库

1. logging recording

LOGGING = {'version': 1,# 是否禁止其他的logging功能'disable_existing_loggers': False,# 格式化'formatters': {# 详细'verbose': {'format': '%(levelname)s %(asctime)s %(module)s %(lineno)d %(message)s'},# 简单'simple': {'format': '%(levelname)s %(module)s %(lineno)d %(message)s'},},# 过滤器'filters': {'require_debug_true': {'()': 'django.utils.log.RequireDebugTrue',},},# 处理方式'handlers': {# 解释器'console': {'level': 'DEBUG','filters': ['require_debug_true'],'class': 'logging.StreamHandler','formatter': 'simple'},# 保存到文件'file': {'level': 'INFO','class': 'logging.handlers.RotatingFileHandler','filename': os.path.join(os.path.dirname(BASE_DIR), "logs/meiduo.log"),  # 日志文件的位置'maxBytes': 300 * 1024 * 1024,'backupCount': 10,'formatter': 'verbose'},},# 定义日志器'loggers': {'django': {  # 定义了一个名为django的日志器'handlers': ['console', 'file'],'propagate': True,},}
}

1. handler exception
   “`
   from django.db import DatabaseError
   from redis.exceptions import RedisError
   from rest_framework.response import Response
   from rest_framework.views import exception_handler as drf_exception_handler
   from rest_framework import status
   import logging

logger = logging.getLogger(‘django’)

def exception_handler(exc, context):
“””
修改rest_framework 中的异常处理 补充redis和数据库处理
:param exc:异常
:param context:异常发现时的上下文 context[‘view’] 可以访问发生异常的视图
:return:
“”“

# Call REST framework's default exception handler first,
# to get the standard error response.
# print('exc', exc)
# print('context', context)
response = drf_exception_handler(exc, context)
view = context['view']# Now add the HTTP status code to the response.
if response is None:# 查看是否存在数据库异常 以及 Redis异常if isinstance(response, DatabaseError) or isinstance(response, RedisError):logger.error('[%s] %s' % (view, exc))response = Response({"message": "服务器内部错误"}, status=status.HTTP_507_INSUFFICIENT_STORAGE)return response

“`
by the way, there you should setting REST_FRAMEWORK in setting.py

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