用于B/S架构快速部署手机扫码功能

• 二维码数据预生成，提升请求响应时延
• 内置缓存，极简部署

# 将文件上传至服务器
# 解压文件
tar -zxvf fast-qrcode_v1.0.0_linux_amd64.tar.gz -C /opt

# 创建配置文件夹
mkdir -p /etc/fast-qrcode/

# 移动配置文件
mv /opt/default.conf /etc/fast-qrcode/default.conf

# 配置文件可执行
chmod +x /opt/fast-qrcode

vim /etc/systemd/system/fast-qrcode.service

#文件内容
[Unit]
Description=Fast QRScan Service
After=network.target

[Service]
Type=simple
User=root
Restart=on-failure
RestartSec=5s
ExecStart=/opt/fast-qrcode -c /etc/fast-qrcode/default.conf

[Install]
WantedBy=multi-user.target

启动服务：systemctl start fast-qrcode

停止服务：systemctl stop fast-qrcode

设置自启：systemctl enable fast-qrcode

GET /actuator/:metric

metric取值

• cache - 监控内部缓存运行情况

EntryCount the number of items currently in the cache.

EvacuateCount is a metric indicating the number of times an eviction occurred.

ExpiredCount is a metric indicating the number of times an expire occurred.

HitCount is a metric that returns number of times a key was found in the cache.

HitRate is the ratio of hits over lookups.

LookupCount is a metric that returns the number of times a lookup for a given key occurred.

MissCount is a metric that returns the number of times a miss occurred in the cache.

OverwriteCount indicates the number of times entries have been overriden.

r 返回值: 0 正常，-1 异常

{
  "EntryCount": 272,                          
  "EvacuateCount": 0,
  "ExpiredCount": 10,
  "HitCount": 7156,
  "HitRate": 0.8909362549800797,
  "LookupCount": 8032,
  "MissCount": 876,
  "OverwriteCount": 819,
  "r": 0
}

• create - 创建扫码请求计数器
• lookup - 轮询查找扫码结果计数器
• submit - 提交扫码结果计数器
• notify - 一次扫码通知计数器

GET /ping

用于测量服务存活状态，正常返回值：

{
  "message": "pong"
}

GET /create

GET /lookup/:uuid

POST /submit/:uuid

POST /notify/:uuid