如何实现springboot+aop+Lua分布式限流

// 限流的个数
  private int maxCount = 10;
  // 指定的时间内
  private long interval = 60;
  // 原子类计数器
  private AtomicInteger atomicInteger = new AtomicInteger(0);
  // 起始时间
  private long startTime = System.currentTimeMillis();

  public boolean limit(int maxCount, int interval) {
    atomicInteger.addAndGet(1);
    if (atomicInteger.get() == 1) {
      startTime = System.currentTimeMillis();
      atomicInteger.addAndGet(1);
      return true;
    }
    // 超过了间隔时间，直接重新开始计数
    if (System.currentTimeMillis() - startTime > interval * 1000) {
      startTime = System.currentTimeMillis();
      atomicInteger.set(1);
      return true;
    }
    // 还在间隔时间内,check有没有超过限流的个数
    if (atomicInteger.get() > maxCount) {
      return false;
    }
    return true;
  }

-- 获取调用脚本时传入的第一个key值（用作限流的 key）
local key = KEYS[1]
-- 获取调用脚本时传入的第一个参数值（限流大小）
local limit = tonumber(ARGV[1])

-- 获取当前流量大小
local curentLimit = tonumber(redis.call('get', key) or "0")

-- 是否超出限流
if curentLimit + 1 > limit then
  -- 返回(拒绝)
  return 0
else
  -- 没有超出 value + 1
  redis.call("INCRBY", key, 1)
  -- 设置过期时间
  redis.call("EXPIRE", key, 2)
  -- 返回(放行)
  return 1
end

    
      org.springframework.boot
      spring-boot-starter-web
    
    
      org.springframework.boot
      spring-boot-starter-data-redis
    
    
      org.springframework.boot
      spring-boot-starter-aop
    
    
      com.google.guava
      guava
      21.0
    
    
      org.springframework.boot
      spring-boot-starter-test
    
    
      org.apache.commons
      commons-lang3
    

    
      org.springframework.boot
      spring-boot-starter-test
      test
      
        
          org.junit.vintage
          junit-vintage-engine
        
      
    
  

spring.redis.host=127.0.0.1
spring.redis.port=6379

@Configuration
public class RedisLimiterHelper {

  @Bean
  public RedisTemplate limitRedisTemplate(LettuceConnectionFactory redisConnectionFactory) {
    RedisTemplate template = new RedisTemplate<>();
    template.setKeySerializer(new StringRedisSerializer());
    template.setValueSerializer(new GenericJackson2JsonRedisSerializer());
    template.setConnectionFactory(redisConnectionFactory);
    return template;
  }
}

/**
 * @author fu
 * @description 限流类型
 * @date 2020/4/8 13:47
 */
public enum LimitType {

  /**
   * 自定义key
   */
  CUSTOMER,

  /**
   * 请求者IP
   */
  IP;
}

/**
 * @author fu
 * @description 自定义限流注解
 * @date 2020/4/8 13:15
 */
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Inherited
@Documented
public @interface Limit {

  /**
   * 名字
   */
  String name() default "";

  /**
   * key
   */
  String key() default "";

  /**
   * Key的前缀
   */
  String prefix() default "";

  /**
   * 给定的时间范围 单位(秒)
   */
  int period();

  /**
   * 一定时间内最多访问次数
   */
  int count();

  /**
   * 限流的类型(用户自定义key 或者 请求ip)
   */
  LimitType limitType() default LimitType.CUSTOMER;
}

/**
 * @author fu
 * @description 限流切面实现
 * @date 2020/4/8 13:04
 */
@Aspect
@Configuration
public class LimitInterceptor {

  private static final Logger logger = LoggerFactory.getLogger(LimitInterceptor.class);

  private static final String UNKNOWN = "unknown";

  private final RedisTemplate limitRedisTemplate;

  @Autowired
  public LimitInterceptor(RedisTemplate limitRedisTemplate) {
    this.limitRedisTemplate = limitRedisTemplate;
  }

  /**
   * @param pjp
   * @author fu
   * @description 切面
   * @date 2020/4/8 13:04
   */
  @Around("execution(public * *(..)) && @annotation(com.xiaofu.limit.api.Limit)")
  public Object interceptor(ProceedingJoinPoint pjp) {
    MethodSignature signature = (MethodSignature) pjp.getSignature();
    Method method = signature.getMethod();
    Limit limitAnnotation = method.getAnnotation(Limit.class);
    LimitType limitType = limitAnnotation.limitType();
    String name = limitAnnotation.name();
    String key;
    int limitPeriod = limitAnnotation.period();
    int limitCount = limitAnnotation.count();

    /**
     * 根据限流类型获取不同的key ,如果不传我们会以方法名作为key
     */
    switch (limitType) {
      case IP:
        key = getIpAddress();
        break;
      case CUSTOMER:
        key = limitAnnotation.key();
        break;
      default:
        key = StringUtils.upperCase(method.getName());
    }

    ImmutableList keys = ImmutableList.of(StringUtils.join(limitAnnotation.prefix(), key));
    try {
      String luaScript = buildLuaScript();
      RedisScript redisScript = new DefaultRedisScript<>(luaScript, Number.class);
      Number count = limitRedisTemplate.execute(redisScript, keys, limitCount, limitPeriod);
      logger.info("Access try count is {} for name={} and key = {}", count, name, key);
      if (count != null && count.intValue() <= limitCount) {
        return pjp.proceed();
      } else {
        throw new RuntimeException("You have been dragged into the blacklist");
      }
    } catch (Throwable e) {
      if (e instanceof RuntimeException) {
        throw new RuntimeException(e.getLocalizedMessage());
      }
      throw new RuntimeException("server exception");
    }
  }

  /**
   * @author fu
   * @description 编写 redis Lua 限流脚本
   * @date 2020/4/8 13:24
   */
  public String buildLuaScript() {
    StringBuilder lua = new StringBuilder();
    lua.append("local c");
    lua.append("\nc = redis.call('get',KEYS[1])");
    // 调用不超过最大值，则直接返回
    lua.append("\nif c and tonumber(c) > tonumber(ARGV[1]) then");
    lua.append("\nreturn c;");
    lua.append("\nend");
    // 执行计算器自加
    lua.append("\nc = redis.call('incr',KEYS[1])");
    lua.append("\nif tonumber(c) == 1 then");
    // 从第一次调用开始限流，设置对应键值的过期
    lua.append("\nredis.call('expire',KEYS[1],ARGV[2])");
    lua.append("\nend");
    lua.append("\nreturn c;");
    return lua.toString();
  }


  /**
   * @author fu
   * @description 获取id地址
   * @date 2020/4/8 13:24
   */
  public String getIpAddress() {
    HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
    String ip = request.getHeader("x-forwarded-for");
    if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
      ip = request.getHeader("Proxy-Client-IP");
    }
    if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
      ip = request.getHeader("WL-Proxy-Client-IP");
    }
    if (ip == null || ip.length() == 0 || UNKNOWN.equalsIgnoreCase(ip)) {
      ip = request.getRemoteAddr();
    }
    return ip;
  }
}

/**
 * @Author: fu
 * @Description:
 */
@RestController
public class LimiterController {

  private static final AtomicInteger ATOMIC_INTEGER_1 = new AtomicInteger();
  private static final AtomicInteger ATOMIC_INTEGER_2 = new AtomicInteger();
  private static final AtomicInteger ATOMIC_INTEGER_3 = new AtomicInteger();

  /**
   * @author fu
   * @description
   * @date 2020/4/8 13:42
   */
  @Limit(key = "limitTest", period = 10, count = 3)
  @GetMapping("/limitTest1")
  public int testLimiter1() {

    return ATOMIC_INTEGER_1.incrementAndGet();
  }

  /**
   * @author fu
   * @description
   * @date 2020/4/8 13:42
   */
  @Limit(key = "customer_limit_test", period = 10, count = 3, limitType = LimitType.CUSTOMER)
  @GetMapping("/limitTest2")
  public int testLimiter2() {

    return ATOMIC_INTEGER_2.incrementAndGet();
  }

  /**
   * @author fu
   * @description 
   * @date 2020/4/8 13:42
   */
  @Limit(key = "ip_limit_test", period = 10, count = 3, limitType = LimitType.IP)
  @GetMapping("/limitTest3")
  public int testLimiter3() {

    return ATOMIC_INTEGER_3.incrementAndGet();
  }

}