加锁防止短信重复发送

背景

短信验证码登录场景，限制验证码只能在 1min 内获取一次，防止重复点击导致验证码重复发送

依赖

<dependency>
    <groupId>org.redisson</groupId>
    <artifactId>redisson</artifactId>
</dependency>
<dependency>
    <groupId>com.aliyun</groupId>
    <artifactId>dysmsapi20170525</artifactId>
</dependency>

配置Bean

@ConditionalOnBean(SmsProperties.class)
@Bean
public Client smsClient(SmsProperties smsProperties) {
    Config config = new Config()
            .setAccessKeyId(smsProperties.getAccessKeyId())
            .setAccessKeySecret(smsProperties.getAccessKeySecret());
    return new Client(config);
}

@ConditionalOnBean(RedissonProperties.class)
@Bean
public RedissonClient redissonClient(RedissonProperties redissonProperties) {
    Config config = new Config();
    if (redissonProperties.isSingle()) {
        config.useSingleServer()
                .setDatabase(redissonProperties.getDatabase())
                .setPassword(redissonProperties.getPassword())
                .setAddress(redissonProperties.getAddress());
    } else { / ... }
    return Redisson.create(config);
}

发送短信方法

这里加锁防止其他客户端发送同种业务的短信，可能包括发送不成功的短信

@Override
public void sendSms(SmsRecord smsRecord) {
    SendSmsRequest sendSmsRequest = new SendSmsRequest();
    BeanUtils.copyProperties(smsRecord, sendSmsRequest);
    RLock lock = redissonClient.getLock(String.format(SEND_LOCK_KEY, smsRecord.getBiz(), smsRecord.getPhoneNumbers()));
    try {
        lock.lock();
        SendSmsResponse sendSmsResponse = smsClient.sendSms(sendSmsRequest);
        SendSmsResponseBody body;
        if (null == (body = sendSmsResponse.body)) { return; }
        // BizId RequestId
        smsRecord.setStatus(body.code);
    } catch (Exception e) {
        smsRecord.setStatus(CommonConstants.FAIL);
        log.error("发送失败：{}", e.getMessage(), e);
    } finally {
        lock.unlock();
    }
}

Demo

1、发送短信验证码

先判断是否在限制的时间内发送过验证码，再异步发送短信，发送失败可以设置定时器扫表重发（有效时间内）或者忽略。

@Override
public void sendVerifyCode(SmsBo smsBo) {
    // 判断是否已发送
    String limitKey = String.format(LIMIT_KEY, smsBo.getBiz(), smsBo.getPhoneNumbers());
    if (Boolean.TRUE.equals(redisTemplate.hasKey(limitKey))) {
        log.error("限制时间内已发送过验证码，{}, {}", smsBo.getBiz(), smsBo.getPhoneNumbers());
        throw new CustomException(ErrorCode.CANNOT_SEND_SMS_REPEATED);
    }

    // 发送验证码
    // 这里加锁防止重复点击
    RLock lock = redissonClient.getLock(String.format(LIMIT_KEY, smsBo.getBiz(), limitKey));
    try {
        lock.lock();
        // 判断是否已发送
        if (Boolean.TRUE.equals(redisTemplate.hasKey(limitKey))) {
            log.error("限制时间内已发送过验证码，{}, {}", smsBo.getBiz(), smsBo.getPhoneNumbers());
            throw new CustomException(ErrorCode.CANNOT_SEND_SMS_REPEATED);
        }
        // 记录已发送 （假设限制 60s 内只能发送一次）
        redisTemplate.opsForValue().set(limitKey, true, 60, TimeUnit.SECONDS);
    } finally {
        lock.unlock();
    }
    // 异步去发送
    commonExecutorService.execute(() -> {
        // 生成验证码
        String code = RandomUtil.randomString(RANDOM_STR, RANDOM_LEN);
        // 记录验证码
        redisTemplate.opsForValue().set(String.format(VERIFY_CODE_KEY, smsBo.getBiz(), smsBo.getPhoneNumbers()), code, EXPIRED_SECOND, TimeUnit.SECONDS);
        SmsRecord smsRecord = new SmsRecord();
        BeanUtils.copyProperties(smsBo, smsRecord);
        // 发送验证码
        sendSms(smsRecord);
        // 保存发送记录
        smsRecordService.insert(smsRecord);
    });
}

2、验证

@Override
public void verifyCode(SmsBo smsBo, String code) {
    String key = String.format(VERIFY_CODE_KEY, smsBo.getBiz(), smsBo.getPhoneNumbers());
    if (!Boolean.TRUE.equals(redisTemplate.hasKey(key))) {
        throw new RuntimeException("验证码无效");
    }
    if (!Objects.equals(code, redisTemplate.opsForValue().get(key))) {
        throw new RuntimeException("验证码错误");
    }
    redisTemplate.delete(key);
}

原文地址：https://blog.csdn.net/kuun993/article/details/140576514

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