This is a simple cli application demo with ServiceContext.

1. Build the code

go build -o app

2. Output all ENV

./app outenv

You would see like this:

## Env for service. Ex: dev | stg | prd (-app-env)                                                                                                                                                INT ✘  11:09:23 
#APP_ENV="dev"

## gin mode (debug | release). Default debug (-gin-mode)
#GIN_MODE="debug"

## gin server port. Default 3000 (-gin-port)
#GIN_PORT=3000

## Log level: panic | fatal | error | warn | info | debug | trace (-log-level)
#LOG_LEVEL="trace"

These ENVs are generated from your components in ServiceContext.

3. Use .env file

./app outenv > .env

Open and edit .env file as you want. For example, I change gin server port to 3001.

GIN_PORT=3001

4. Start the service (GIN HTTP)

./app

The result:

...
[GIN-debug] Listening and serving HTTP on :3001