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+# Bootstrap Go
+
+It is hard to write bootstrap tool to quickly create Go service.
+So I write this guide instead.
+This is a quick checklist for me every damn time I need to write a Go service from scratch.
+Also, this is my personal opinion, so feel free to comment.
+
+## Structure
+
+```txt
+main.go
+internal
+| business_1
+| | http
+| | | handler.go
+| | | service.go
+| | | repository.go
+| | | models.go
+| | grpc
+| | | handler.go
+| | | service.go
+| | | repository.go
+| | | models.go
+| | service.go
+| | repository.go
+| | models.go
+| business_2
+| | grpc
+| | | handler.go
+| | | service.go
+| | | repository.go
+| | | models.go
+```
+
+All business codes are inside `internal`.
+Each business has a different directory (`business_1`, `business_2`).
+
+Inside each business, there are 2 handlers: `http`, `grpc`:
+
+- `http` is for public APIs (Android, iOS,... are clients).
+- `grpc` is for internal APIs (other services are clients).
+
+Inside each handler, there are usually 3 layers: `handler`, `service`, `repository`:
+
+- `handler` interacts directly with gRPC or REST using specific codes (cookies,...)
+- `service` is where we write business/logic codes, and only business/logic codes is written here.
+- `repository` is where we write codes which interacts with database/cache like MySQL, Redis, ...
+
+`handler` must exist inside `grpc`, `http`.
+But `service`, `repository`, `models` can exist directly inside `business` if both `grpc`, `http` has same business/logic.
+
+## Do not repeat!
+
+If we have too many services, some of the logic will be overlapped.
+
+For example, service A and service B both need to make POST call API to service C.
+If service A and service B both have libs to call service C to do that API, we need to move the libs to some common pkg libs.
+So in the future, service D which needs to call C will not need to copy libs to handle service C api but only need to import from common pkg libs.
+
+Another bad practice is adapter service.
+No need to write a new service if what we need is just common pkg libs.
+
+## External libs
+
+### Don't use cli libs ([spf13/cobra](https://github.com/spf13/cobra), [urfave/cli](https://github.com/urfave/cli)) just for Go service
+
+What is the point to pass many params (`--abc`, `--xyz`) when what we only need is start service?
+
+In my case, service starts with only config, and config should be read from file or environment like [The Twelve Factors](https://12factor.net/) guide.
+
+### Don't use [grpc-ecosystem/grpc-gateway](https://github.com/grpc-ecosystem/grpc-gateway)
+
+Just don't.
+
+Use [protocolbuffers/protobuf-go](https://github.com/protocolbuffers/protobuf-go), [grpc/grpc-go](https://github.com/grpc/grpc-go) for gRPC.
+
+Write 1 for both gRPC, REST sounds good, but in the end, it is not worth it.
+
+### Use [gin-gonic/gin](https://github.com/gin-gonic/gin) for REST.
+
+Don't use `gin.Context` when pass context from handler layer to service layer, use `gin.Context.Request.Context()` instead.
+
+### Don't use [uber/prototool](https://github.com/uber/prototool), use [bufbuild/buf](https://github.com/bufbuild/buf)
+
+prototool is deprecated, and buf can generate, lint as good as prototool.
+
+### If you want log, just use [uber-go/zap](https://github.com/uber-go/zap)
+
+It is fast!
+
+- Don't overuse `func (*Logger) With`.
+  Because if log line is too long, there is a possibility that we can lost it.
+
+- Use `MarshalLogObject` when we need to hide some field of object when log (field has long or sensitive value)
+
+- Use `contextID` or `traceID` in every log lines for easily debug.
+
+### Don't overuse ORM libs, no need to handle another layer above SQL.
+
+Each ORM libs has each different syntax.
+To learn and use those libs correctly is time consuming.
+So just stick to plain SQL.
+It is easier to debug when something is wrong.
+
+But `database/sql` has its own limit.
+For example, it is hard to get id after insert/update.
+So may be you want to use ORM for those cases.
+
+### If you want test, just use [stretchr/testify](https://github.com/stretchr/testify).
+
+It is easy to write a suite test, thanks to testify.
+Also, for mocking, there are many options out there.
+Pick 1 then sleep peacefully.