Environment variable

rk-db/postgres can distinguish environments with environment variable of DOMAIN

Overview#

There can be multiple environments in real life, and we hope to use different config files in different environments.

rk-db/postgres support multiple DB entries with same name where DOMAIN is used to distinguish environments.

Concept#

How rk-db choose entries？

rk-db/postgres will use environment variable of DOMAIN to distinguish environment

Quick start#

1.Install#

$ go get github.com/rookie-ninja/rk-boot/v2
$ go get github.com/rookie-ninja/rk-gin/v2
$ go get github.com/rookie-ninja/rk-db/postgres

2.Create boot.yaml#

---
gin:
  - name: user-service
    port: 8080
    enabled: true
postgres:
  - name: demo-db
    enabled: true
    domain: dev                 # ENV: DOMAIN=dev
    addr: "localhost:5432"
    user: postgres              # Optional, default: postgres
    pass: pass                  # Optional, default: pass
    database:
      - name: demo
        autoCreate: true
  - name: demo-db
    enabled: true
    domain: prod                # ENV: DOMAIN=prod
    addr: "remote.host:5432"
    user: postgres              # Optional, default: postgres
    pass: pass                  # Optional, default: pass
    database:
      - name: demo
        autoCreate: true

3.ENV：DOMAIN=dev#

package main

import (
    "context"
    "github.com/rookie-ninja/rk-boot/v2"
    _ "github.com/rookie-ninja/rk-db/postgres"
    "os"
)

func main() {
    os.Setenv("DOMAIN", "dev")

    boot := rkboot.NewBoot()

    boot.Bootstrap(context.TODO())

    boot.WaitForShutdownSig(context.TODO())
}

Output

2022-09-19T00:27:01.273+0800    INFO    postgres/boot.go:378       Bootstrap PostgresEntry    {"eventId": "bb4c7b17-db51-4c58-b611-0543e6689f2d", "entryName": "demo-db", "entryType": "PostgresEntry"}
2022-09-19T00:27:01.273+0800    INFO    postgres/boot.go:497       Creating database [demo]
2022-09-19T00:27:01.286+0800    INFO    postgres/boot.go:519       Creating database [demo] successs
2022-09-19T00:27:01.286+0800    INFO    postgres/boot.go:522       Connecting to database [demo]
2022-09-19T00:27:01.295+0800    INFO    postgres/boot.go:540       Connecting to database [demo] success

4.No ENV#

package main

import (
    "context"
    "github.com/rookie-ninja/rk-boot/v2"
    _ "github.com/rookie-ninja/rk-db/postgres"
)

func main() {
    boot := rkboot.NewBoot()

    boot.Bootstrap(context.TODO())

    boot.WaitForShutdownSig(context.TODO())
}