覆盖启动参数

当使用 rk-boot 的时候，如何通过 flag 覆盖 boot.yaml 里的参数？

概述

rk-boot 支持通过命令行和环境变量参数来覆盖 boot.yaml 里的值。

• 覆盖 boot.yaml 里的参数 (通过 --rkset)

快速开始

1.安装

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

2.创建 boot.yaml

---
gin:
  - name: greeter
    port: 8080
    enabled: true

4.创建 main.go

package main

import (
  "context"
  "fmt"
  "github.com/gin-gonic/gin"
  "github.com/rookie-ninja/rk-boot/v2"
  "github.com/rookie-ninja/rk-gin/v2/boot"
  "net/http"
)

func main() {
  // Create a new boot instance.
  boot := rkboot.NewBoot()

  // Register handler
  entry := rkgin.GetGinEntry("greeter")
  entry.Router.GET("/v1/greeter", Greeter)

  // Bootstrap
  boot.Bootstrap(context.TODO())

  boot.WaitForShutdownSig(context.TODO())
}

func Greeter(ctx *gin.Context) {
  ctx.JSON(http.StatusOK, &GreeterResponse{
    Message: fmt.Sprintf("Hello %s!", ctx.Query("name")),
  })
}

type GreeterResponse struct {
  Message string
}

5.通过 flag 覆盖 Port

如果是 List，请使用【gin[0].port】格式访问。

$ go run main.go --rkset gin[0].port=8081
2022-04-17T00:13:52.166+0800    INFO    entry/util.go:332       Found flag to override, applying...     {"flags": ["gin[0].port=8081"]}
2022-04-17T00:13:52.167+0800    INFO    boot/gin_entry.go:656   Bootstrap GinEntry      {"eventId": "19a961f4-b866-4047-9741-aa0a2d00055b", "entryName": "greeter", "entryType": "GinEntry"}
------------------------------------------------------------------------
endTime=2022-04-17T00:13:52.167194+08:00
startTime=2022-04-17T00:13:52.167146+08:00
elapsedNano=47911
timezone=CST
ids={"eventId":"19a961f4-b866-4047-9741-aa0a2d00055b"}
app={"appName":"rk","appVersion":"local","entryName":"greeter","entryType":"GinEntry"}
env={"arch":"amd64","domain":"*","hostname":"lark.local","localIP":"192.168.101.5","os":"darwin"}
payloads={"ginPort":8081}
counters={}
pairs={}
timing={}
remoteAddr=localhost
operation=Bootstrap
resCode=OK
eventStatus=Ended
EOE

发送请求到：8081

$ curl "localhost:8081/v1/greeter?name=rk-dev"
{"Message":"Hello rk-dev!"}

Cheers

6.通过环境变量覆盖 Port

覆盖 boot.yaml 里参数的时候，需要带上 【RK_】 作为前缀，此外，如果是 List 使用 【X】 访问。

例如：RK_GIN_0_PORT

package main

import (
  "context"
  "fmt"
  "github.com/gin-gonic/gin"
  "github.com/rookie-ninja/rk-boot/v2"
  "github.com/rookie-ninja/rk-gin/v2/boot"
  "net/http"
)

func main() {
  os.Setenv("RK_GIN_0_PORT", "8081")

  // Create a new boot instance.
  boot := rkboot.NewBoot()

  // Register handler
  entry := rkgin.GetGinEntry("greeter")
  entry.Router.GET("/v1/greeter", Greeter)

  // Bootstrap
  boot.Bootstrap(context.TODO())

  boot.WaitForShutdownSig(context.TODO())
}

func Greeter(ctx *gin.Context) {
  ctx.JSON(http.StatusOK, &GreeterResponse{
    Message: fmt.Sprintf("Hello %s!", ctx.Query("name")),
  })
}

type GreeterResponse struct {
  Message string
}

$ go run main.go
2022-04-17T00:20:38.452+0800    INFO    entry/util.go:299       Found ENV to override, applying...      {"env": ["RK_GIN_0_PORT=8081 => gin[0].port=8081"]}
2022-04-17T00:20:38.453+0800    INFO    boot/gin_entry.go:656   Bootstrap GinEntry      {"eventId": "06f271e8-7eb8-4c1a-abef-f710afe18021", "entryName": "greeter", "entryType": "GinEntry"}
------------------------------------------------------------------------
endTime=2022-04-17T00:20:38.453386+08:00
startTime=2022-04-17T00:20:38.453345+08:00
elapsedNano=41474
timezone=CST
ids={"eventId":"06f271e8-7eb8-4c1a-abef-f710afe18021"}
app={"appName":"rk","appVersion":"local","entryName":"greeter","entryType":"GinEntry"}
env={"arch":"amd64","domain":"*","hostname":"lark.local","localIP":"192.168.101.5","os":"darwin"}
payloads={"ginPort":8081}
counters={}
pairs={}
timing={}
remoteAddr=localhost
operation=Bootstrap
resCode=OK
eventStatus=Ended
EOE