最近在做游戏服务分层的时候,一直想把mysql的访问独立成一个单独的服务DBGate,原因如下:
请求收拢到DBGate,可以使DBGate变为无状态的,方便横向扩展
当请求量或者存储量变大时,mysql需要做分库分表,DBGate可以内部直接处理,外界无感知
通过restful限制对数据请求的形式,仅支持简单的get/post/patch/put 进行增删改查,并不支持复杂查询。这个也是和游戏业务的特性有关,如果网站等需要复杂查询的业务,对此并不适合
DBGate使用多进程模式,方便控制与mysql之间的链接数,进行mysql访问量阀值保护
方便在DBGate上进行访问量统计,慢查询统计、权限控制等等一系列逻辑
目前是使用python,以后要使用其他语言进行mysql操作时,只要进行标准的http请求即可,不会出现不兼容的情况
当然坏处也是有的:
首当其冲就是单次请求的响应时间变长,毕竟中间加了一层服务,并且还是http格式
部署上比原来复杂了一些,很多对mysql直接操作的思维需要进行转变,一开始可能会有些不适
不过总的来说,还是利大于弊,所以最终还是决定搭建DBGate
当然,我们不可能去手工挨个写每个库表对应的restful服务,值得庆幸的是django和flask都提供了对应的解决方案,我们一个个介绍.
Flask
参考链接: flask-restless
flask-restless使用方法比较简单,我直接贴一下代码即可:
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import datetime
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_restless import APIManager
app = Flask(__name__)
db = SQLAlchemy(app)
restless = APIManager(app, flask_sqlalchemy_db = db)
class User(db.Model):
"""
user
"""
id = db.Column(db.Integer, primary_key = True )
username = db.Column(db.String( 255 ), unique = True , nullable = False )
password = db.Column(db.String( 255 ), nullable = False )
create_time = db.Column(db.DateTime, nullable = False , default = datetime.datetime.utcnow)
login_time = db.Column(db.DateTime)
restless.create_api(User, methods = [ 'GET' , 'POST' , 'DELETE' , 'PATCH' , 'PUT' ], results_per_page = 100 )
db.create_all()
if __name__ = = '__main__' :
app.run(port = 25000 )
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其对应的restful操作如下:
获取用户列表: GET /user
添加用户: POST /user
获取单个用户: GET /user/1
覆盖单个用户: PUT /user/1
修改单个用户: PATCH /user/1
注意:
在http请求中,记得加入header: Content-Type: application/json
flask-restless中,PUT和PATCH一样,都是传入什么字段,只修改什么字段,不会完全覆盖
Django
参考链接: Django REST framework
Django用起来要更复杂一些,也因为django版自带了一个可视化的操作页面,如下:
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1. 在settings中添加:
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REST_FRAMEWORK = {
# Use hyperlinked styles by default.
# Only used if the `serializer_class` attribute is not set on a view.
'DEFAULT_MODEL _SERIALIZER_CLASS' :
'rest_framework.serializers .HyperlinkedModelSerializer' ,
# Use Django's standard `django.contrib.auth` permissions,
# or allow read-only access for unauthenticated users.
'DEFAULT _PERMISSION_CLASSES' : [
#'rest_framework.permissions .DjangoModelPermissionsOrAnonReadOnly',
'rest_framework .permissions.IsAdminUser' ,
]
}
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2. 通过startapp建立一个app: demo
3. 修改demo的models:
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class User(models.Model):
# key是保留字
password = models.IntegerField()
nick = models.CharField(max_length = 255 )
create_time = models.DateTimeField(default = datetime.datetime.now)
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4. 在demo下新建serializers.py
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class User(models.Model):
# key是保留字
password = models.IntegerField()
nick = models.CharField(max_length = 255 )
create_time = models.DateTimeField(default = datetime.datetime.now)
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5. 在demo下修改views.py
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from django.shortcuts import render
from rest_framework import viewsets
from serializers import UserSerializer
from models import User
class UserViewSet(viewsets.ModelViewSet):
queryset = User.objects. all ()
serializer_class = UserSerializer
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6. 在demo下新建urls.py
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import os.path
from django.conf.urls import patterns, include, url
from django.conf.urls.static import static
from django.conf import settings
import views
from rest_framework import routers
appname = os.path.basename (os.path.dirname(os.path.abspath(__file__)))
router = routers.DefaultRouter()
router.register( 'users' , views.UserViewSet, appname)
urlpatterns = patterns('',
url(r '^' , include(router.urls)),
)
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7. 在mysite.urls下include demo.urls和rest_framework.urls
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urlpatterns = patterns('',
url(r '^demo/' , include( 'demo.urls' )),
url(r '^admin/' , include(admin.site.urls)),
url(r '^api-auth/' , include( 'rest_framework.urls' , namespace = 'rest_framework' ))
)
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8. 执行初始化数据操作:
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python manage.py syncdb
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之后访问: http://127.0.0.1:8000/demo 即可看到如下界面了:
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对应的测试代码如下:
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import json
import requests
from urlparse import urljoin
BASE_URL = 'http://127.0.0.1:16500/'
AUTH = ( 'admin' , 'admin' )
def test_get_user_list():
rsp = requests.get(urljoin(BASE_URL, '/demo/users/' ), auth = AUTH, headers = {
'Accept' : 'application/json'
})
assert rsp.ok
def test_post_user_list():
json_data = dict (
password = 0 ,
nick = 'oo' ,
create_time = '2014-03-3T03:3:3'
)
rsp = requests.post(urljoin(BASE_URL, '/demo/users/' ), auth = AUTH, headers = {
'Accept' : 'application/json' ,
'Content-Type' : 'application/json' ,
}, data = json.dumps(json_data))
assert rsp.ok
def test_get_user():
rsp = requests.get(urljoin(BASE_URL, '/demo/users/1' ), auth = AUTH, headers = {
'Accept' : 'application/json' ,
'Content-Type' : 'application/json' ,
})
assert rsp.ok
def test_put_user():
json_data = dict (
password = 100 ,
nick = 'xx' ,
create_time = '2014-03-3T03:3:3'
)
# 注意最后的 /
rsp = requests.put(urljoin(BASE_URL, '/demo/users/1/' ), auth = AUTH, headers = {
'Accept' : 'application/json' ,
'Content-Type' : 'application/json' ,
}, data = json.dumps(json_data),
)
assert rsp.ok, rsp.status_code
def test_patch_user():
json_data = dict (
password = 300 ,
)
rsp = requests.patch(urljoin(BASE_URL, '/demo/users/1/' ), auth = AUTH, headers = {
'Accept' : 'application/json' ,
'Content-Type' : 'application/json' ,
}, data = json.dumps(json_data),
)
assert rsp.ok, rsp.status_code
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Django REST framework 是严格区分PUT和PATCH的,这一点和flask-restless 不一样,需要注意。
总结
以上所述是小编给大家介绍的使用python为mysql实现restful接口,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!
原文链接:http://www.uml.org.cn/wfw/201712294.asp?utm_source=tuicool&utm_medium=referral