@acheetahk/redis 中文文档教程

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@acheetahk/redis

@acheetahk/redis . supports all redis（singleton）methods and includes the best Cache and mutex decorators.

请使用大于 2.5.0 的版本，集群和 redlock 将在 v3 支持。 0.0 ✨

Methods Nav

• 关于redis

• redis

• 关于baseRedis 方法

• onLock

• freedLock

• 关于 typescript decorator

• lock

• cache

• hashCache

• 关于javascript装饰器函数

• toLock

• getCache< /a>

• getHashCache

Installation

npm install @acheetahk/redis

cnpm install @acheetahk/redis

yarn add @acheetahk/redis

Dependencies

{
  "@types/ioredis": "4.17.7",
  "ioredis": "^4.17.3"
}

Usage

redis

import { BaseRedis } from '@acheetahk/redis';

const base = new BaseRedis(`<YOUR OPTIONS>`);

const redis = base.redis;

baseRedis - options

Param	Type	Default	Description
[port]	number | string | Object	6379	Port of the Redis server, or a URL string(see the examples below), or the options object(see the third argument).
[host]	string | Object	"localhost"	Host of the Redis server, when the first argument is a URL string, this argument is an object represents the options.
[options]	Object		Other options.
[options.port]	number	6379	Port of the Redis server.
[options.host]	string	"localhost"	Host of the Redis server.
[options.family]	string	4	Version of IP stack. Defaults to 4.
[options.path]	string	null	Local domain socket path. If set the port, host and family will be ignored.
[options.keepAlive]	number	0	TCP KeepAlive on the socket with a X ms delay before start. Set to a non-number value to disable keepAlive.
[options.noDelay]	boolean	true	Whether to disable the Nagle's Algorithm. By default we disable it to reduce the latency.
[options.connectionName]	string	null	Connection name.
[options.db]	number	0	Database index to use.
[options.password]	string	null	If set, client will send AUTH command with the value of this option when connected.
[options.dropBufferSupport]	boolean	false	Drop the buffer support for better performance. This option is recommended to be enabled when handling large array response and you don't need the buffer support.
[options.enableReadyCheck]	boolean	true	When a connection is established to the Redis server, the server might still be loading the database from disk. While loading, the server not respond to any commands. To work around this, when this option is true, ioredis will check the status of the Redis server, and when the Redis server is able to process commands, a ready event will be emitted.
[options.enableOfflineQueue]	boolean	true	By default, if there is no active connection to the Redis server, commands are added to a queue and are executed once the connection is "ready" (when enableReadyCheck is true, "ready" means the Redis server has loaded the database from disk, otherwise means the connection to the Redis server has been established). If this option is false, when execute the command when the connection isn't ready, an error will be returned.
[options.connectTimeout]	number	10000	The milliseconds before a timeout occurs during the initial connection to the Redis server.
[options.autoResubscribe]	boolean	true	After reconnected, if the previous connection was in the subscriber mode, client will auto re-subscribe these channels.
[options.autoResendUnfulfilledCommands]	boolean	true	If true, client will resend unfulfilled commands(e.g. block commands) in the previous connection when reconnected.
[options.lazyConnect]	boolean	false	By default, When a new Redis instance is created, it will connect to Redis server automatically. If you want to keep the instance disconnected until a command is called, you can pass the lazyConnect option to the constructor: javascript var redis = new Redis({ lazyConnect: true }); // No attempting to connect to the Redis server here. // Now let's connect to the Redis server redis.get('foo', function () { });
[options.tls]	Object		TLS connection support. See https://github.com/luin/ioredis#tls-options
[options.keyPrefix]	string	"''"	The prefix to prepend to all keys in a command.
[options.retryStrategy]	function		See "Quick Start" section
[options.maxRetriesPerRequest]	number		See "Quick Start" section
[options.reconnectOnError]	function		See "Quick Start" section
[options.readOnly]	boolean	false	Enable READONLY mode for the connection. Only available for cluster mode.
[options.stringNumbers]	boolean	false	Force numbers to be always returned as JavaScript strings. This option is necessary when dealing with big numbers (exceed the [-2^53, +2^53] range).
[options.enableAutoPipelining]	boolean	false	When enabled, all commands issued during an event loop iteration are automatically wrapped in a pipeline and sent to the server at the same time. This can improve performance by 30-50%.
[options.autoPipeliningIgnoredCommands]	string[]	[]	The list of commands which must not be automatically wrapped in pipelines.
[options.maxScriptsCachingTime]	number	60000	Default script definition caching time.

onLock

import { BaseRedis } from '@acheetahk/redis';

const base = new BaseRedis(`<YOUR OPTIONS>`);

const [test, result] = await Promise.all([
  base.onLock('onLockTest', 5),
  base.onLock('onLockTest'),
]);

// result = false

onLock - args

Param	Type	Description
key	string	string mutex lock key
ttl	number	mutex lock expiration time, units are seconds

freedLock

import { BaseRedis } from '@acheetahk/redis';

const base = new BaseRedis(`<YOUR OPTIONS>`);

const result1 = await base.onLock('onLockTest', 1000); // true
const result2 = await base.onLock('onLockTest'); // false
await base1.freedLock('onLockTest');
const result3 = await base1.onLock('onLockTest'); // true

freedLock - args

Param	Type	Description
key	string	string mutex lock key

lock

import { BaseRedis } from '@acheetahk/redis';

const base = new BaseRedis(`<YOUR OPTIONS>`);

class Demo {
  @base.lock('key', 5, true)
  async doSomeThings(args: any) {
    const result = await `<YOUR PROMISE FUNCTION>`(args);
    return result;
  }
}

const demo = new Demo();

// success
try {
  const result = await demo.doSomeThings({ key: 'value'});
} catch (error) {
  // console.log(error);
}

// error
try {
  await Promise.all([
    demo.doSomeThings({ key: 'value'}),
    demo.doSomeThings({ key: 'value'})
  ]);
} catch (error) {
  // Error: Frequent operation'
}

lock - args

Param	Type	Description
key	string	string mutex lock key
ttl	number	mutex lock expiration time, units are seconds
isAuto	boolean	whether to automatically serialization args according to the bound function parameters, the default is false
message	string	failure information, the default is Frequent operation

cache

import { BaseRedis } from '@acheetahk/redis';

let count = 0;
const base = new BaseRedis(`<YOUR OPTIONS>`);

class Demo {
  @base.cache('cacheKey', 3600, true) // 1h
  doSomeThings(num: number) {
    return num + count;
  }
}

const demo = new Demo();

const result = await demo.doSomeThings(1); // 1
const result1 = await demo.doSomeThings(2); // 1

await base.redis.del('cacheKey');
const result2 = await demo.doSomeThings(2); // 2

cache - args

Param	Type	Description
key	string	string cache key
ttl	number	expiration time, units are seconds
isAuto	boolean	whether to automatically serialization args according to the bound function parameters, the default is false

hashCache

import { BaseRedis } from '@acheetahk/redis';

let count = 0;

const base = new BaseRedis(`<YOUR OPTIONS>`);

class Demo {
  @base.hashCache('hkey') // 1h
  doSomeThings(num: number) {
    return num + count;
  }
}

const demo = new Demo();

const result = await demo.doSomeThings(1); // 1
const result1 = await demo.doSomeThings(2); // 1

await base.redis.hdel('hkey', autoMd5([1]));
const result2 = await demo.doSomeThings(2); // 2

hashCache - args

Param	Type	Description
hkey	string	hash cache key

toLock

import { BaseRedis } from '@acheetahk/redis';
const base = new BaseRedis(`<YOUR OPTIONS>`);

const getResult = async () => { return await doSomeThings() };

try {
  await Promise.all([
    toLock(base, 'toLock', getResult, 5).withArgs(),
    toLock(base, 'toLock', getResult, 5).withArgs(),
  ]);
} catch (error) {
  // Error: Frequent operation
}

toLock - args

Param	Type	Description
baseRedis	BaseRedis	instance by BaseRedis
key	string	string mutex lock key
next	Function	function to be executed
ttl	number	mutex lock expiration time, units are seconds
message	string	failure information, the default is Frequent operation

getCache

import { BaseRedis } from '@acheetahk/redis';
const base = new BaseRedis(`<YOUR OPTIONS>`);

let info = 'before ';
const getResult = async (num: string, num2: string) => {
  const result = await doSomeThings();
  const value = info + result + num + num2;
  return value;
};

const result1 = await getCache(base, 'getCache', getResult, 10000).withArgs(123, 234); // 'before success123234';

info = 'now ';
const result2 = await getCache(base, 'getCache', getResult, 10000).withArgs(123, 234); // 'before success123234';

await base.redis.del('getCache');
const result3 = await getCache(base, 'getCache', getResult, 10000).withArgs(123, 234); // 'now success123234';

getCache - args

Param	Type	Description
baseRedis	BaseRedis	instance by BaseRedis
key	string	string mutex lock key
next	Function	function to be executed
ttl	number	expiration time, units are seconds

getHashCache

import { BaseRedis } from '@acheetahk/redis';
const base = new BaseRedis(`<YOUR OPTIONS>`);

let info = 'before ';

const getResult = async (num: string, num2: string) => {
  const result = await doSomeThings();
  const value = info + result + num + num2;
  return value;
};

const result1 = await getHashCache(base, 'getHashCache', 'key', getResult).withArgs(123, 234); // 'before success123234'

info = 'now ';
const result2 = await getHashCache(base, 'getHashCache', 'key', getResult).withArgs(123, 234); // 'before success123234'

await base.redis.hdel('getHashCache', 'key');
const result4 = await getHashCache(base, 'getHashCache', 'key', getResult).withArgs(123, 234); // 'now success123234'

await base.redis.del('getHashCache');

getHashCache - args

Param	Type	Description
baseRedis	BaseRedis	instance by BaseRedis
hkey	string	hash cache key
key	string	hash table key
next	Function	function to be executed