麻雀虽小，五脏俱全 -- The sparrow may be small but it has all the vital organs.
sparrow is a simple microservice demo (with grpc protocol)
```
sparrow root directory
├── api grpc protobuf directory
├── build build directory
│ ├── ci ci/cd config
│ ├── external_env external config (prometheus only for now)
├── cmd command
├── config project config
│ ├── config.go read config
│ └── dev.yaml dev enviroment config
│ └── prod.yaml prod enviroment config
├── deploy deploy cmd
├── init init directory
├── internal business logic
│ ├── app business application
│ ├── pkg pkg (app package will import)
├── bitmap bit map
├── biz_redis business redis client
├── entity global define
├── fuse api fuse
├── middleware middleware
├── monitor prometheus monitor & pprof
├── serror error package
├── service_mng service register & find & loadbalance
├── slog log package
├── trace jaeger trace
├── util util tools
├── log log
├── scripts some scripts
├── README.md
└── go.mod
```
- Http
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