Merge branch 'master' of github.com:ehlxr/budd
commit
3947896a04
8
pom.xml
8
pom.xml
|
|
@ -173,7 +173,13 @@
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|||
<dependency>
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<groupId>redis.clients</groupId>
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<artifactId>jedis</artifactId>
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<version>2.8.0</version>
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<version>3.4.0</version>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-data-redis</artifactId>
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<version>2.5.2</version>
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</dependency>
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<dependency>
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|
|
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|||
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@ -0,0 +1,132 @@
|
|||
/*
|
||||
* The MIT License (MIT)
|
||||
*
|
||||
* Copyright © 2020 xrv <xrg@live.com>
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
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||||
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package io.github.ehlxr.rate;
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import java.util.LinkedList;
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import java.util.List;
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import java.util.Random;
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import java.util.concurrent.TimeUnit;
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/**
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* 滑动时间窗口限流工具
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* 参考：https://www.cnblogs.com/dijia478/p/13807826.html#!comments
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*
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* @author ehlxr
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* @since 2021-07-15 22:04.
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*/
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public class SlideWindow {
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/**
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* 限制次数
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*/
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private final int count;
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/**
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* 时间窗口大小(毫秒)
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*/
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private final long timeWindow;
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/**
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* 限流队列
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*/
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private final List<Long> list;
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public SlideWindow(int count, long timeWindow) {
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this.count = count;
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this.timeWindow = timeWindow;
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list = new LinkedList<>();
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}
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/**
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* 滑动时间窗口限流算法
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* 在指定时间窗口，指定限制次数内，是否允许通过
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*
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* @return 是否允许通过
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*/
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public synchronized boolean acquire() {
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// 获取当前时间
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long nowTime = System.currentTimeMillis();
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// 如果队列还没满，则允许通过，并添加当前时间戳到队列开始位置
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if (list.size() < count) {
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// 把之前这个位置的数据给依次向后移动
|
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list.add(0, nowTime);
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return true;
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}
|
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|
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// 队列已满（达到限制次数），则获取队列中最早添加的时间戳
|
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// 用当前时间戳 减去 最早添加的时间戳
|
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if (nowTime - list.get(count - 1) <= timeWindow) {
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// 若结果小于等于timeWindow，则说明在timeWindow内，通过的次数大于count
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// 不允许通过
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return false;
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} else {
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// 若结果大于timeWindow，则说明在timeWindow内，通过的次数小于等于count
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// 允许通过，并删除最早添加的时间戳，将当前时间添加到队列开始位置
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list.remove(count - 1);
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list.add(0, nowTime);
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return true;
|
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}
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}
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|
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/**
|
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* 等待直到获得允许
|
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*/
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public synchronized void tryAcquire() throws InterruptedException {
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long nowTime = System.currentTimeMillis();
|
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if (list.size() < count) {
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list.add(0, nowTime);
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return;
|
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}
|
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|
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long l = nowTime - list.get(count - 1);
|
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if (l <= timeWindow) {
|
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// 等待
|
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TimeUnit.MILLISECONDS.sleep(timeWindow - l);
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tryAcquire();
|
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} else {
|
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list.remove(count - 1);
|
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list.add(0, nowTime);
|
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}
|
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}
|
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|
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public static void main(String[] args) throws InterruptedException {
|
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SlideWindow slideWindow = new SlideWindow(5, 1000);
|
||||
|
||||
while (true) {
|
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// 任意1秒内，只允许5次通过
|
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// if (slideWindow.acquire()) {
|
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// System.out.println(System.currentTimeMillis());
|
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// }
|
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slideWindow.tryAcquire();
|
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|
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System.out.println(System.currentTimeMillis());
|
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|
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// 睡眠0-10ms
|
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Thread.sleep(new Random().nextInt(10));
|
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}
|
||||
|
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}
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||||
|
||||
}
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@ -0,0 +1,120 @@
|
|||
/*
|
||||
* The MIT License (MIT)
|
||||
*
|
||||
* Copyright © 2020 xrv <xrg@live.com>
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
|
||||
package io.github.ehlxr.redis;
|
||||
|
||||
/**
|
||||
* redis lock/滑动时间窗口限流
|
||||
*
|
||||
* @author ehlxr
|
||||
* @since 2021-07-15 22:42.
|
||||
*/
|
||||
public interface RedisDAO {
|
||||
|
||||
/**
|
||||
* 释放分布式锁时使用的 lua 脚本，保证原子性
|
||||
* <p>
|
||||
* if (redis.call('get', KEYS[1]) == ARGV[1])
|
||||
* then
|
||||
* return redis.call('del', KEYS[1])
|
||||
* else
|
||||
* return 0
|
||||
* end
|
||||
*/
|
||||
String RELEASE_LOCK_LUA = "if (redis.call('get', KEYS[1]) == ARGV[1]) then return redis.call('del', KEYS[1]) else return 0 end";
|
||||
|
||||
/**
|
||||
* 滑动窗口限流使用的 lua 脚本，保证原子性
|
||||
* <p>
|
||||
* local key = KEYS[1];
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||||
* local index = tonumber(ARGV[1]);
|
||||
* local time_window = tonumber(ARGV[2]);
|
||||
* local now_time = tonumber(ARGV[3]);
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||||
* local far_time = redis.call('lindex', key, index);
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||||
* if (not far_time)
|
||||
* then
|
||||
* redis.call('lpush', key, now_time);
|
||||
* redis.call('pexpire', key, time_window+1000);
|
||||
* return 1;
|
||||
* end
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||||
* if (now_time - far_time > time_window)
|
||||
* then
|
||||
* redis.call('rpop', key);
|
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* redis.call('lpush', key, now_time);
|
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* redis.call('pexpire', key, time_window+1000);
|
||||
* return 1;
|
||||
* else
|
||||
* return 0;
|
||||
* end
|
||||
*/
|
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String SLIDE_WINDOW_LUA = "local key = KEYS[1];\n" + "local index = tonumber(ARGV[1]);\n" + "local time_window = tonumber(ARGV[2]);\n" + "local now_time = tonumber(ARGV[3]);\n" + "local far_time = redis.call('lindex', key, index);\n" + "if (not far_time)\n" + "then\n" + " redis.call('lpush', key, now_time);\n" + " redis.call('pexpire', key, time_window+1000);\n" + " return 1;\n" + "end\n" + "\n" + "if (now_time - far_time > time_window)\n" + "then\n" + " redis.call('rpop', key);\n" + " redis.call('lpush', key, now_time);\n" + " redis.call('pexpire', key, time_window+1000);\n" + " return 1;\n" + "else\n" + " return 0;\n" + "end";
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|
||||
/**
|
||||
* 获取分布式锁
|
||||
*
|
||||
* @param logId 日志 id
|
||||
* @param key key
|
||||
* @param value value，需要保证全局唯一，用来删除分布式锁时判断身份使用
|
||||
* @param expireTime 锁过期时间，毫秒，防止业务崩溃未删除锁，导致死锁
|
||||
* @return 是否获取成功锁
|
||||
*/
|
||||
Boolean getDistributedLock(String key, String value, long expireTime);
|
||||
|
||||
/**
|
||||
* 释放分布式锁
|
||||
*
|
||||
* @param logId 日志 id
|
||||
* @param key key
|
||||
* @param value value，需要和获取锁时传入的一致
|
||||
* @return 是否释放成功锁
|
||||
*/
|
||||
Boolean releaseDistributedLock(String key, String value);
|
||||
|
||||
/**
|
||||
* 分布式限流队列，在时间窗口内（包含该时间点），判断是否达到限流的阀值
|
||||
* 本接口实现的方法通过加锁避免并发问题，性能不高。只是为了说明限流逻辑如何实现
|
||||
*
|
||||
* @param logId 日志 id
|
||||
* @param key key
|
||||
* @param count 限流阀值
|
||||
* @param timeWindow 限流时间窗口
|
||||
* @return 是否允许通过（通过即不进行限流）
|
||||
*/
|
||||
Boolean slideWindow(String key, int count, long timeWindow);
|
||||
|
||||
/**
|
||||
* 分布式限流队列，在时间窗口内（包含该时间点），判断是否达到限流的阀值
|
||||
* 本接口实现的方法通过 Lua 脚本避免并发问题，性能较高。
|
||||
*
|
||||
* @param logId 日志 id
|
||||
* @param key key
|
||||
* @param count 限流阀值
|
||||
* @param timeWindow 限流时间窗口
|
||||
* @return 是否允许通过（通过即不进行限流）
|
||||
*/
|
||||
Boolean slideWindowLua(String key, int count, long timeWindow);
|
||||
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -0,0 +1,129 @@
|
|||
/*
|
||||
* The MIT License (MIT)
|
||||
*
|
||||
* Copyright © 2020 xrv <xrg@live.com>
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
|
||||
package io.github.ehlxr.redis.impl;
|
||||
|
||||
import io.github.ehlxr.redis.RedisDAO;
|
||||
import org.slf4j.Logger;
|
||||
import org.slf4j.LoggerFactory;
|
||||
import org.springframework.beans.factory.annotation.Autowired;
|
||||
import redis.clients.jedis.JedisCluster;
|
||||
import redis.clients.jedis.params.SetParams;
|
||||
|
||||
import java.util.ArrayList;
|
||||
import java.util.Collections;
|
||||
import java.util.List;
|
||||
|
||||
/**
|
||||
* redis lock/滑动时间窗口限流
|
||||
*
|
||||
* @author ehlxr
|
||||
* @since 2021-07-15 22:44.
|
||||
*/
|
||||
public class JedisDAOImpl implements RedisDAO {
|
||||
private final Logger log = LoggerFactory.getLogger(JedisDAOImpl.class);
|
||||
|
||||
@Autowired
|
||||
private JedisCluster jc;
|
||||
|
||||
@Override
|
||||
public Boolean getDistributedLock(String key, String value, long expireTime) {
|
||||
String set = null;
|
||||
try {
|
||||
set = jc.set(key, value, SetParams.setParams().nx().px(expireTime));
|
||||
log.debug("getLock redis key: {}, value: {}, expireTime: {}, result: {}", key, value, expireTime, set);
|
||||
} catch (Exception e) {
|
||||
log.error("getLock redis key: {}, value: {}, expireTime: {}", key, value, expireTime, e);
|
||||
}
|
||||
return "OK".equals(set);
|
||||
}
|
||||
|
||||
@Override
|
||||
public Boolean releaseDistributedLock(String key, String value) {
|
||||
Object eval = null;
|
||||
try {
|
||||
eval = jc.eval(RELEASE_LOCK_LUA, Collections.singletonList(key), Collections.singletonList(value));
|
||||
log.debug("releaseLock redis key: {}, value: {}, result: {}", key, value, eval);
|
||||
} catch (Exception e) {
|
||||
log.error("releaseLock redis key: {}, value: {}", key, value, e);
|
||||
}
|
||||
return Long.valueOf(1L).equals(eval);
|
||||
}
|
||||
|
||||
@Override
|
||||
public synchronized Boolean slideWindow(String key, int count, long timeWindow) {
|
||||
if (count <= 0 || timeWindow <= 0) {
|
||||
return false;
|
||||
}
|
||||
try {
|
||||
// 获取当前时间
|
||||
long nowTime = System.currentTimeMillis();
|
||||
// 获取队列中，达到限流数量的位置，存储的时间戳
|
||||
String farTime = jc.lindex(key, count - 1);
|
||||
// 如果为空，说明限流队列还没满，则允许通过，并添加当前时间戳到队列开始位置
|
||||
if (farTime == null) {
|
||||
jc.lpush(key, String.valueOf(nowTime));
|
||||
// 给限流队列增加过期时间，防止长时间不用导致内存一直占用
|
||||
jc.pexpire(key, timeWindow + 1000L);
|
||||
return true;
|
||||
}
|
||||
|
||||
// 队列已满（达到限制次数），用当前时间戳 减去 最早添加的时间戳
|
||||
if (nowTime - Long.parseLong(farTime) > timeWindow) {
|
||||
// 若结果大于 timeWindow，则说明在 timeWindow 内，通过的次数小于等于 count
|
||||
// 允许通过，并删除最早添加的时间戳，将当前时间添加到队列开始位置
|
||||
jc.rpop(key);
|
||||
jc.lpush(key, String.valueOf(nowTime));
|
||||
// 给限流队列增加过期时间，防止长时间不用导致内存一直占用
|
||||
jc.pexpire(key, timeWindow + 1000L);
|
||||
return true;
|
||||
}
|
||||
// 若结果小于等于 timeWindow，则说明在 timeWindow 内，通过的次数大于 count
|
||||
// 不允许通过
|
||||
return false;
|
||||
} catch (Exception e) {
|
||||
log.error("[logId:{}]", e);
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public Boolean slideWindowLua(String key, int count, long timeWindow) {
|
||||
if (count <= 0 || timeWindow <= 0) {
|
||||
return false;
|
||||
}
|
||||
Object eval = null;
|
||||
try {
|
||||
List<String> argvList = new ArrayList<>();
|
||||
argvList.add(String.valueOf(count - 1));
|
||||
argvList.add(String.valueOf(timeWindow));
|
||||
argvList.add(String.valueOf(System.currentTimeMillis()));
|
||||
eval = jc.eval(SLIDE_WINDOW_LUA, Collections.singletonList(key), argvList);
|
||||
log.debug("slideWindowLua redis key: {}, count: {}, timeWindow: {}, result: {}", key, count, timeWindow, eval);
|
||||
} catch (Exception e) {
|
||||
log.error("slideWindowLua redis key: {}, count: {}, timeWindow: {}", key, count, timeWindow, e);
|
||||
}
|
||||
return Long.valueOf(1L).equals(eval);
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,114 @@
|
|||
/*
|
||||
* The MIT License (MIT)
|
||||
*
|
||||
* Copyright © 2020 xrv <xrg@live.com>
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in
|
||||
* all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
* THE SOFTWARE.
|
||||
*/
|
||||
|
||||
package io.github.ehlxr.redis.impl;
|
||||
|
||||
import io.github.ehlxr.redis.RedisDAO;
|
||||
import org.slf4j.Logger;
|
||||
import org.slf4j.LoggerFactory;
|
||||
import org.springframework.beans.factory.annotation.Autowired;
|
||||
import org.springframework.data.redis.core.ListOperations;
|
||||
import org.springframework.data.redis.core.RedisTemplate;
|
||||
import org.springframework.data.redis.core.script.DefaultRedisScript;
|
||||
import org.springframework.data.redis.core.script.RedisScript;
|
||||
|
||||
import java.util.Collections;
|
||||
import java.util.concurrent.TimeUnit;
|
||||
|
||||
/**
|
||||
* @author ehlxr
|
||||
* @since 2021-07-15 22:51.
|
||||
*/
|
||||
public class LettuceDAOImpl implements RedisDAO {
|
||||
private final Logger log = LoggerFactory.getLogger(LettuceDAOImpl.class);
|
||||
|
||||
@Autowired
|
||||
private RedisTemplate<String, String> rt;
|
||||
|
||||
@Override
|
||||
public Boolean getDistributedLock(String key, String value, long expireTime) {
|
||||
Boolean set = false;
|
||||
try {
|
||||
set = rt.opsForValue().setIfAbsent(key, value, expireTime, TimeUnit.MILLISECONDS);
|
||||
log.debug("getLock redis key: {}, value: {}, expireTime: {}, result: {}", key, value, expireTime, set);
|
||||
} catch (Exception e) {
|
||||
log.error("getLock redis key: {}, value: {}, expireTime: {}", key, value, expireTime, e);
|
||||
}
|
||||
return set;
|
||||
}
|
||||
|
||||
@Override
|
||||
public Boolean releaseDistributedLock(String key, String value) {
|
||||
Long execute = null;
|
||||
try {
|
||||
RedisScript<Long> redisScript = new DefaultRedisScript<>(RELEASE_LOCK_LUA, Long.class);
|
||||
execute = rt.execute(redisScript, Collections.singletonList(key), value);
|
||||
log.debug("releaseLock redis key: {}, value: {}, result: {}", key, value, execute);
|
||||
} catch (Exception e) {
|
||||
log.error("releaseLock redis key: {}, value: {}", key, value, e);
|
||||
}
|
||||
return Long.valueOf(1L).equals(execute);
|
||||
}
|
||||
|
||||
@Override
|
||||
public synchronized Boolean slideWindow(String key, int count, long timeWindow) {
|
||||
try {
|
||||
long nowTime = System.currentTimeMillis();
|
||||
ListOperations<String, String> list = rt.opsForList();
|
||||
String farTime = list.index(key, count - 1);
|
||||
if (farTime == null) {
|
||||
list.leftPush(key, String.valueOf(nowTime));
|
||||
rt.expire(key, timeWindow + 1000L, TimeUnit.MILLISECONDS);
|
||||
return true;
|
||||
}
|
||||
if (nowTime - Long.parseLong(farTime) > timeWindow) {
|
||||
list.rightPop(key);
|
||||
list.leftPush(key, String.valueOf(nowTime));
|
||||
rt.expire(key, timeWindow + 1000L, TimeUnit.MILLISECONDS);
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
} catch (Exception e) {
|
||||
log.error("[logId:{}]", e);
|
||||
return false;
|
||||
}
|
||||
}
|
||||
|
||||
@Override
|
||||
public Boolean slideWindowLua(String key, int count, long timeWindow) {
|
||||
if (count <= 0 || timeWindow <= 0) {
|
||||
return false;
|
||||
}
|
||||
Long execute = null;
|
||||
try {
|
||||
RedisScript<Long> redisScript = new DefaultRedisScript<>(SLIDE_WINDOW_LUA, Long.class);
|
||||
execute = rt.execute(redisScript, Collections.singletonList(key), String.valueOf(count - 1), String.valueOf(timeWindow), String.valueOf(System.currentTimeMillis()));
|
||||
log.debug("slideWindowLua redis key: {}, count: {}, timeWindow: {}, result: {}", key, count, timeWindow, execute);
|
||||
} catch (Exception e) {
|
||||
log.error("slideWindowLua redis key: {}, count: {}, timeWindow: {}", key, count, timeWindow, e);
|
||||
}
|
||||
return Long.valueOf(1L).equals(execute);
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue