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Redis

时间:2020-06-13 19:46:55      阅读:50      评论:0      收藏:0      [点我收藏+]

标签:启动   发布订阅   string   订阅   can   长度   number   认证   运行   

# 是一种非关系数据库   no only SQL  缓存 操作原子性  数据保存在内存 定期写到磁盘

安装  sudo apt-get update
      sudo apt install redis-server
启动  redis-server
连接:
    本机连接: redis-cli    127.0.0.1:6379
    远程连接:
        修改虚拟机上redis的配置文件    /etc/redis/redis.conf
       """
    如果要从外部计算机连接到Redis,可以采用以下解决方案之一:
    1)通过从运行服务器的同一主机连接到Redis,只需禁用保护模式,从环回接口发送命令“CONFIG SET protected mode no”,
        但是,如果要从internet公开访问Redis,请确保这样做。使用配置重写将此更改永久化。
    2) 或者,您可以通过编辑Redis配置文件,将protected mode选项设置为“no”,然后重新启动服务器来禁用保护模式。
    3) 如果您只是为了测试而手动启动服务器,请使用“--protected mode no”选项重新启动它。
    4) 设置绑定地址或身份验证密码。
    """
        bind 0.0.0.0      允许IP所有连接
        requirepass password     设置用户认证密码
        重启redis    /etc/init.d/redis-server restart
        之后远程redis需要认证
        redis-cli   连接     
        AUTH password   认证

使用:
    操作字符串:   key -value
        set name "" EX 超时时间秒 FX 超时时间毫秒 NX 当set时如果name存在就忽略,不存在才创建 XX 当set时name存在则修改,不存在不执行      # 存入字符串
        get name                            # 取出字符串
        keys *                                # 查看所有键
        mset         # 批量设置 MSET key value key value
        mget         # 批量获取 MGET key key 
        getset     # 获取旧值并设置新值
        
        ****************************************************************************
        setbit     # 将字符串转换为二进制,对二进制的某一位设置0或1
        ord("a") 获取ASCII码  bin(ASCII码) 获得二进制
        "w":119    01110111   ->
        "h":104    01101000   ->
        "y":121    01111001   ->  "g":103  01100111
        19 0 
        20 0
        21 1
        22 1
        
        
        getbit     # 获取这个字符串二进制位上的值
        bitcount # 获取为1的个数
        
        127.0.0.1:6379> set age 18 ex 3
        OK
        127.0.0.1:6379> get age
        (nil)
        127.0.0.1:6379> GETRANGE name 1 2                # 对字符串切片
        "hy"
        127.0.0.1:6379> SETRANGE name 0 "rtuiijn"  # 从0位置向后覆盖
        (integer) 7
        127.0.0.1:6379> get name
        "rtuiijn"
        
        strlen   获取字节长度
        
        incr 对数字自增1
        
        incrbyfloat  key num    浮点增
        
        decr  自减
        
        append    拼接
        
        Hash操作   如同结构体    小明 -> {"age":18,"hobby":"gril"}   小红 -> {"age":18,"sex":"women"}
        HSET key filed value
        hmset key filed value [filed value...]
        HGETALL key 获取key中的所有filed
        HLEN key 获取key中filed的个数
        
        HEXISTS key  判断key是否存在
        
        hscan key cursor [match *] [count count]    cursor 光标
        127.0.0.1:6379> HSCAN xiaoming 0 match a*
        1) "0"
        2) 1) "age"
             2) "18"

    操作列表 
        LPUSH KEY VALUE   从左到右存
        RPUSH KEY VALUE  
        LRANGE KEY START STOP
        LLEN key
        LINSERT key befor|after 位置 value     位置是列表中具体的value
        LSET key index value  重新设置某位置上的值
        LREM key count value  删掉count个value
        LPOP 
        LINDEX KEY INDEX
        LTRIM key start stop
        RPOPLPUSH keyA keyB 从A的右边拿出一个值给B
        RPOPLPUSH keyA keyB timeout 从A的右边拿出一个值给B,A中无值后等待超时,期间有加入则立即放到B
        BLPOP key [key....] timeout      将key中的所有值依次取出,取完所有key之后等待超时时间,此时如果有新加入的值则立刻取出 
        
    操作集合     关系测试
        SADD key value 
        SMEMBER key 
        SCARD key      元素个数
    
    有序集合
    
    
    管道
        python操作redis每次操作都要请求一次redis,消耗比较大,这时就可以使用管道,
        所有的操作变为一个事务,最终一起提交到redis执行
        import redis
        # r = redis.Redis(host="192.168.193.129",port=6379,password="w000000")
        # print(r.get("age"))
        pool = redis.ConnectionPool(host="192.168.193.129",port=6379,password="w000000")   # 建立一个连接池
        r = redis.Redis(connection_pool=pool)
        pipe = r.pipeline(transaction=True)    # 开启事务       transaction:业务
        r.set("year","2020")
        r.set("month","5")
        pipe.execute()   # 执行事务
        
     发布订阅:
        # 发布订阅类
                import redis
                class Helper():
                    def __init__(self):
                        self.pool = redis.ConnectionPool(host="192.168.193.129",port=6379,password="w000000")
                        self.__conn = redis.Redis(connection_pool=self.pool)
                        self.pub = "fm105.8"
                        self.sub = "fm105.8"
                    def public(self,msg):
                        self.__conn.publish(self.pub,msg)
                        return True
                    def subscribe(self):
                        pub = self.__conn.pubsub()
                        pub.subscribe(self.sub)
                        pub.parse_response()
                        return pub     
        # 发布者
        from redis_helper import Helper
        obj = Helper()
        obj.public("www")

        # 订阅者        多个订阅同时接收
        from redis_helper import Helper
        obj = Helper()
        sub = obj.subscribe()
        while True:
            msg = sub.parse_response()
            print(msg)
        
        
        
        
Celery:
    Celery 是一个 基于python开发的分布式异步消息任务队列
    报错AttributeError: float object has no attribute items:解决redis==2.10.6
    报错kombu.exceptions.VersionMismatch: Redis transport requires redis-py versions 3.2.0 or later. You have 2.10.6:解决kombu==4.1.0
    celery==4.1.0
    
    celery_test.py
    from clery import Celery
    app = Celery("tasts",
                           broker="redis://:w000000@192.168.193.129:6379/0",  # 中间件
                           backend="redis://:w000000@192.168.193.129")      # 最后的任务结果需要指定地点写入
    @app.tast
    def add(x,y):
        return x+y
   
     celery -A celery_test worker --loglevel=info   启动
     
     另起会话
     进入python
     from celery_test import add
     add.delay(4,4)   
     <AsyncResult: 4a710433-ae4b-4f05-ae4c-7385f2968f5a>
     >>> result.get()
    13
    
    
在django中使用celery
    一、创建django项目
    二、创建celery.py、tasks.py,修改__init__.py位置如下
    celery_django
        -celery_django
            -__init__.py
            -celery.py
        -app01
            -tasks.py
    celery.py
        from __future__ import absolute_import, unicode_literals
        import os
        from celery import Celery

         # set the default Django settings module for the ‘celery‘ program.
        os.environ.setdefault(DJANGO_SETTINGS_MODULE, django_celery.settings)    # 项目名

        app = Celery(django_celery)     # app名

        # Using a string here means the worker don‘t have to serialize
        # the configuration object to child processes.
        # - namespace=‘CELERY‘ means all celery-related configuration keys
        #   should have a `CELERY_` prefix.
        app.config_from_object(django.conf:settings, namespace=CELERY)

        # Load task modules from all registered Django app configs.
        app.autodiscover_tasks()


        @app.task(bind=True)
        def debug_task(self):
            print(Request: {0!r}.format(self.request))
    __init__.py 
        from __future__ import absolute_import, unicode_literals
          
        # This will make sure the app is always imported when
        # Django starts so that shared_task will use this app.
        from .celery import app as celery_app
        __all__ = [celery_app]
    tasks.py
        from __future__ import absolute_import, unicode_literals
        from celery import shared_task
        @shared_task
        def add(x, y):
            return x + y
        @shared_task
        def mul(x, y):
            return x * y
        @shared_task
        def xsum(numbers):
            return sum(numbers)
    三、修改settings.py 
        CELERY_BROKER_URL=redis://:w000000@192.168.193.129:6379/0
        CELERY_RESULT_BACKEND=redis://:w000000@192.168.193.129
    四、在项目目录中启动celery
        celery -A django_celery worker -l info
            返回:
            /usr/lib/python3/dist-packages/celery/platforms.py:795: RuntimeWarning: Youre running the worker with superuser privileges: this is
            absolutely not recommended!

            Please specify a different user using the -u option.

            User information: uid=0 euid=0 gid=0 egid=0

              uid=uid, euid=euid, gid=gid, egid=egid,
             
             -------------- celery@why-virtual-machine v4.1.0 (latentcall)
            ---- **** ----- 
            --- * ***  * -- Linux-5.3.0-51-generic-x86_64-with-Ubuntu-18.04-bionic 2020-05-21 11:54:13
            -- * - **** --- 
            - ** ---------- [config]
            - ** ---------- .> app:         celery_test:0x7f655863c5f8
            - ** ---------- .> transport:   redis://:**@192.168.193.129:6379/0
            - ** ---------- .> results:     redis://:**@192.168.193.129/
            - *** --- * --- .> concurrency: 1 (prefork)
            -- ******* ---- .> task events: OFF (enable -E to monitor tasks in this worker)
            --- ***** ----- 
             -------------- [queues]
                            .> celery           exchange=celery(direct) key=celery
                            

            [tasks]
              . celery_test.tasks.add
              . celery_test.tasks.mul
              . celery_test.tasks.xsum
              . django_celery.celery.debug_task

            [2020-05-21 11:54:13,966: INFO/MainProcess] Connected to redis://:**@192.168.193.129:6379/0
            [2020-05-21 11:54:13,992: INFO/MainProcess] mingle: searching for neighbors
            [2020-05-21 11:54:15,039: INFO/MainProcess] mingle: all alone
            [2020-05-21 11:54:15,058: WARNING/MainProcess] /usr/lib/python3/dist-packages/celery/fixups/django.py:202: UserWarning: Using settings.DEBUG leads to a memory leak, never use this setting in production environments!
              warnings.warn(Using settings.DEBUG leads to a memory leak, never 
            [2020-05-21 11:54:15,058: INFO/MainProcess] celery@why-virtual-machine ready.
            [2020-05-21 11:54:16,126: INFO/MainProcess] Received task: celery_test.tasks.add[44d461c0-5fea-4690-93e7-696d3439553c]  
            [2020-05-21 11:54:16,128: INFO/MainProcess] Received task: celery_test.tasks.add[5c2e933f-a926-4c5b-90a9-cbad1f1c050b]  
            [2020-05-21 11:54:16,129: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,130: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,134: INFO/MainProcess] Received task: celery_test.tasks.add[38bedc71-a5df-4ec6-8788-5a03fee379d0]  
            [2020-05-21 11:54:16,136: INFO/ForkPoolWorker-1] Task celery_test.tasks.add[44d461c0-5fea-4690-93e7-696d3439553c] succeeded in 0.007576367999718059s: 111
            [2020-05-21 11:54:16,138: INFO/MainProcess] Received task: celery_test.tasks.add[c27419ab-0615-48ba-8778-4ccd5fe5e5fb]  
            [2020-05-21 11:54:16,140: INFO/MainProcess] Received task: celery_test.tasks.add[2edd2899-85fb-4548-b84a-2a83fe26b0da]  
            [2020-05-21 11:54:16,140: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,141: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,142: INFO/ForkPoolWorker-1] Task celery_test.tasks.add[5c2e933f-a926-4c5b-90a9-cbad1f1c050b] succeeded in 0.0015097089999471791s: 111
            [2020-05-21 11:54:16,144: INFO/MainProcess] Received task: celery_test.tasks.add[572f86f7-a852-4c2d-99c2-344f48703e7b]  
            [2020-05-21 11:54:16,144: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,144: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,145: INFO/ForkPoolWorker-1] Task celery_test.tasks.add[38bedc71-a5df-4ec6-8788-5a03fee379d0] succeeded in 0.0008416309992753668s: 111
            [2020-05-21 11:54:16,147: INFO/MainProcess] Received task: celery_test.tasks.add[5bf2f552-cb77-419b-bea5-276cdec41b27]  
            [2020-05-21 11:54:16,148: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,148: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,149: INFO/ForkPoolWorker-1] Task celery_test.tasks.add[c27419ab-0615-48ba-8778-4ccd5fe5e5fb] succeeded in 0.0016753949985286454s: 111
            [2020-05-21 11:54:16,151: INFO/MainProcess] Received task: celery_test.tasks.add[a3d9893a-9203-48eb-afeb-98c89b0d2f8e]  
            [2020-05-21 11:54:16,153: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,153: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,154: INFO/ForkPoolWorker-1] Task celery_test.tasks.add[2edd2899-85fb-4548-b84a-2a83fe26b0da] succeeded in 0.001095354000426596s: 111
            [2020-05-21 11:54:16,156: INFO/MainProcess] Received task: celery_test.tasks.add[992ad66f-3572-4442-b6ba-001b344327f4]  
            [2020-05-21 11:54:16,157: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,157: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,158: INFO/ForkPoolWorker-1] Task celery_test.tasks.add[572f86f7-a852-4c2d-99c2-344f48703e7b] succeeded in 0.0011435019987402484s: 111
            [2020-05-21 11:54:16,160: INFO/MainProcess] Received task: celery_test.tasks.add[248c52a6-2792-4a0f-b34e-abdfe0ce7c45]  
            [2020-05-21 11:54:16,160: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,161: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,161: INFO/ForkPoolWorker-1] Task celery_test.tasks.add[5bf2f552-cb77-419b-bea5-276cdec41b27] succeeded in 0.0011216180009796517s: 111
            [2020-05-21 11:54:16,163: INFO/MainProcess] Received task: celery_test.tasks.add[4c4c28cc-d8e9-4466-a963-f6e5f71ccbad]  
            [2020-05-21 11:54:16,164: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,165: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,166: INFO/ForkPoolWorker-1] Task celery_test.tasks.add[a3d9893a-9203-48eb-afeb-98c89b0d2f8e] succeeded in 0.001705070999378222s: 111
            [2020-05-21 11:54:16,168: INFO/MainProcess] Received task: celery_test.tasks.add[d0f56426-2254-486a-8ab3-a88da51c9019]  
            [2020-05-21 11:54:16,169: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,170: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,170: INFO/ForkPoolWorker-1] Task celery_test.tasks.add[992ad66f-3572-4442-b6ba-001b344327f4] succeeded in 0.001145517000622931s: 111
            [2020-05-21 11:54:16,172: INFO/MainProcess] Received task: celery_test.tasks.add[5b885602-d37e-4f07-b1fb-e708097c8ac0]  
            [2020-05-21 11:54:16,173: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,173: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,173: INFO/ForkPoolWorker-1] Task celery_test.tasks.add[248c52a6-2792-4a0f-b34e-abdfe0ce7c45] succeeded in 0.0006293960013863398s: 111
            [2020-05-21 11:54:16,175: INFO/MainProcess] Received task: celery_test.tasks.add[3de908e5-186c-41c2-bdf0-6ed67cb05084]  
            [2020-05-21 11:54:16,176: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,176: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,177: INFO/ForkPoolWorker-1] Task celery_test.tasks.add[4c4c28cc-d8e9-4466-a963-f6e5f71ccbad] succeeded in 0.0010510339998290874s: 111
            [2020-05-21 11:54:16,178: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,179: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,179: INFO/ForkPoolWorker-1] Task celery_test.tasks.add[d0f56426-2254-486a-8ab3-a88da51c9019] succeeded in 0.000996217000647448s: 111
            [2020-05-21 11:54:16,180: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,181: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,181: INFO/ForkPoolWorker-1] Task celery_test.tasks.add[5b885602-d37e-4f07-b1fb-e708097c8ac0] succeeded in 0.0008322609992319485s: 111
            [2020-05-21 11:54:16,182: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,182: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:54:16,183: INFO/ForkPoolWorker-1] Task celery_test.tasks.add[3de908e5-186c-41c2-bdf0-6ed67cb05084] succeeded in 0.0007275499992829282s: 111
            [2020-05-21 11:55:36,283: INFO/MainProcess] Received task: celery_test.tasks.add[7252baec-66ca-41e6-8c4b-de6d5083f3b5]  
            [2020-05-21 11:55:36,284: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:55:36,284: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:55:36,286: INFO/ForkPoolWorker-1] Task celery_test.tasks.add[7252baec-66ca-41e6-8c4b-de6d5083f3b5] succeeded in 0.0020388960001582745s: 111
            [2020-05-21 11:55:52,701: INFO/MainProcess] Received task: celery_test.tasks.add[0edcf8a0-48f7-40b2-800c-c66acd983921]  
            [2020-05-21 11:55:52,702: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:55:52,702: WARNING/ForkPoolWorker-1] 4
            [2020-05-21 11:55:52,703: INFO/ForkPoolWorker-1] Task celery_test.tasks.add[0edcf8a0-48f7-40b2-800c-c66acd983921] succeeded in 0.0011271639996266458s: 111

    五、启动项目
    六、获取任务id
        tasks.id 
    七、根据任务id获取任务结果
        from celery.result import AsyncResult
        task_id = ""
        res_task = AsyncResult(id=task_id)
        res = res.get()

celery定时任务
    目录结构如下:
        s3proj/
        ├── celery.py
        ├── __init__.py
        ├── __pycache__
        │   ├── celery.cpython-36.pyc
        │   ├── __init__.cpython-36.pyc
        │   └── tasks.cpython-36.pyc
        └── tasks.py

         celery.py:
            from celery import Celery
            #创建一个Celery对象
            broker = redis://:w000000@127.0.0.1:6379/0  #任务放在用redis://ip:端口/第几个数据库
            backend = redis://:w000000@127.0.0.1 #任务结果放在
            include = [s3proj.tasks,]    #任务所在目录
            app = Celery(broker=broker, backend=backend, include=include)

            app.conf.timezone = Asia/Shanghai  #配置时区
            app.conf.enable_utc = False      # 是否使用UTC

            from datetime import timedelta
            from celery.schedules import crontab
            app.conf.beat_schedule = {
                #任务名称自定义可随意
                get_banner-task: {
                    task: s3proj.tasks.get_baidu_info,#任务所在路径且指定哪个任务
                    schedule: 10.0,  #定时任务相关
                                    },
                }
            tasks.py:
            from .celery import app
            @app.task  #一定要加装饰器
            def get_baidu_info():
                return "success"
      
        启动worker
            celery -A s3proj worker -l info
        启动beat
            celery -A s3proj beat
Celery与Django结合实现定时任务
    
        1.pip3 install django-celery-beat
        2.INSTALLED_APPS = (
        ...,
        django_celery_beat,
    )
        3.python3 manage.py makemigrations
        4.python3 manage.py migrate
        5.进入admin
        Clocked    
        Crontabs              # 具体日期时间执行
        Intervals              # 间隔执行
        Periodic tasks       # 任务定义,任务在task.py中,会被自动发现
        Solar events    
        
        celery -A celery_time beat -l info -S django            # 启动beat
        celery -A celery_time worker -l info                         # 启动worker

 

Redis

标签:启动   发布订阅   string   订阅   can   长度   number   认证   运行   

原文地址:https://www.cnblogs.com/123why/p/13121244.html

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