Redis-Python Api

Python操作Redis集群

strictRedis对象方法用于连接redis

指定主机地址，port与服务器连接，默认db是0，redis默认数据库有16个，在配置文件中指定database 16

1、对redis的单实例进行连接操作根据不同的实例方法，与redis的命令对应

python3
>>>import redis
>>>r = redis.StrictRedis(host='localhost', port=6379, db=0,password='root')
>>>r.set('lufei', 'guojialei')
True
>>>r.get('lufei')
'bar'

增删改查
>>> conn=redis.StrictRedis()
>>>
>>>
>>> conn.set("name1","alex1")
True
>>> conn.set("name2","wupeiqi")
True
>>>
>>>
>>> conn.set("name1","alex666")
True
>>> conn.delete("name2","name1")
2
>>> conn.keys()
[b'name3', b'name2', b'name1']

2、sentinel集群连接并操作

[root@db01 ~]# redis-server /data/6380/redis.conf
[root@db01 ~]# redis-server /data/6381/redis.conf
[root@db01 ~]# redis-server /data/6382/redis.conf 
[root@db01 ~]# redis-sentinel /data/26380/sentinel.conf &

--------------------------------
## 导入redis sentinel包
>>> from redis.sentinel import Sentinel  
## 指定sentinel的地址和端口号
>>> sentinel = Sentinel([('localhost', 26380)], socket_timeout=0.1)  
## 测试，获取以下主库和从库的信息
>>> sentinel.discover_master('mymaster')  
>>> sentinel.discover_slaves('mymaster')  

## 配置读写分离
# 写节点
>>> master = sentinel.master_for('mymaster', socket_timeout=0.1)  
# 读节点
>>> slave = sentinel.slave_for('mymaster', socket_timeout=0.1)  
### 读写分离测试 key     
>>> master.set('oldboy', '123')  
>>> slave.get('oldboy')  
'123'
----------------------

redis cluster的连接并操作（python2.7.2以上版本才支持redis cluster，我们选择的是3.5）
https://github.com/Grokzen/redis-py-cluster

3、python连接rediscluster集群测试

python3
>>> from rediscluster import StrictRedisCluster  
>>> startup_nodes = [{"host": "127.0.0.1", "port": "7000"}]  
### Note: decode_responses must be set to True when used with python3  
>>> rc = StrictRedisCluster(startup_nodes=startup_nodes, decode_responses=True)  
>>> rc.set("foo", "bar")  
True  
>>>   
'bar'

Redis存储Session

django-redis-sessions 官方文档：https://pypi.org/project/django-redis-sessions/
dango-redis 官方文档：http://niwinz.github.io/django-redis/latest/#_configure_as_cache_backend

安装模块

pip3 install django-redis-sessions
或者 
pip3 install django-redis

本文这里用的是django 2.0语法，创建django项目

django-admin startproject mydjango

修改settings.py文件

.........
CACHES = {
    "default": {
        "BACKEND": "django_redis.cache.RedisCache",
        "LOCATION": "redis://127.0.0.1:6379/0",
        "OPTIONS": {
            "CLIENT_CLASS": "django_redis.client.DefaultClient",
            "PASSWORD": "",
#             "PARSER_CLASS": "redis.connection.HiredisParser",
#             "SOCKET_TIMEOUT": 10,
#             "CONNECTION_POOL_CLASS_KWARGS": {
#                 "max_connections": 2,
#             }
        }
    }
}
  
# SESSION_COOKIE_AGE = 30 * 60 #设置 session 过期时间为30分钟
SESSION_ENGINE = 'django.contrib.sessions.backends.cache'

创建app01

django-admin startapp app01

添加 url 路由

vim ./mydjango/urls.py

from django.contrib import admin
from django.urls import path
from app01 import views
urlpatterns = [
    path('set_session/',views.set_session),
    path('get_session/',views.get_session),
    path('admin/', admin.site.urls),
]

确保启动redis服务端，默认方式启动

redis-server &
redis-cli 连接无误
发送ping命令得到pong即可

启动django

python3 manage.py runserver 0.0.0.0:8000

访问视图，设置一条session信息，存入redis数据库

image.png

访问视图，获取session信息

image.png

检查redis数据库，是否存在一条key

127.0.0.1:6379> keys *
1) ":1:django.contrib.sessions.cachep220moqvxclz2hyjqmbybqs3v8ck2i39"

获取这个key的值
127.0.0.1:6379> get :1:django.contrib.sessions.cachep220moqvxclz2hyjqmbybqs3v8ck2i39
"\x80\x04\x95!\x00\x00\x00\x00\x00\x00\x00}\x94(\x8c\busername\x94\x8c\x06chaoge\x94\x8c\x03age\x94K\x12u."