Golang text/template 渲染terraform文件

11-12 DEVOPS,Golang Eric Winn 4 views

Golang text/template 渲染terraform文件

11-12 4 views

定义模板

这里定义的是阿里云的ECS,考虑通用性，未使用扩展模块，而是使用了循环生成的方式提高灵活性，所以传入的是一个列表
range . 对于当前这个模板来说，最外层只有一个可遍历的对象，所以可以这样用
index 表示按索引取值，.Tags 是个列表，所以需要使用index

	TerraformBaseTemplate = `
provider "alicloud" {
     access_key = "${var.access_key}"
     secret_key = "${var.secret_key}"
     region     = "${var.region}"
}
    
{{ range . }}
    
resource "alicloud_instance" "{{.ShortName}}" {
     image_id                   = "{{.ImageId}}"
    
     vswitch_id                 = "{{.VSWitchId}}"
     security_groups            = ["{{.SGroupsId}}"]
    
     instance_type              = "{{.InstanceType}}"
     system_disk_size           = 40
     system_disk_category       = "{{ .DiskCateGory }}"
    
     instance_name              = "{{ .HostName }}"
     host_name                  = "{{ .HostName }}"
     instance_charge_type       = "{{ .ChargeType }}"
     tags                       = { "project": "{{index .Tags 0 }}", "app": "{{index .Tags 1 }}"}
}
    
{{ end }}
`

TerraformBaseTemplate = `

provider "alicloud" {

access_key = "${var.access_key}"

secret_key = "${var.secret_key}"

region = "${var.region}"

}

resource "alicloud_instance" "{{.ShortName}}" {

image_id = "{{.ImageId}}"

vswitch_id = "{{.VSWitchId}}"

security_groups = ["{{.SGroupsId}}"]

instance_type = "{{.InstanceType}}"

system_disk_size = 40

system_disk_category = "{{ .DiskCateGory }}"

instance_name = "{{ .HostName }}"

host_name = "{{ .HostName }}"

instance_charge_type = "{{ .ChargeType }}"

tags = { "project": "{{index .Tags 0 }}", "app": "{{index .Tags 1 }}"}

}

定义数据模型

type TerraFormBaseTemplateModel struct {
	ShortName    string
	ImageId      string
	VSWitchId    string
	SGroupsId    string
	InstanceType string
	DiskCateGory string
	HostName     string
	ChargeType   string
	Tags         []string
}

type TerraFormBaseTemplateModel struct {

ShortName string

ImageId string

VSWitchId string

SGroupsId string

InstanceType string

DiskCateGory string

HostName string

ChargeType string

Tags []string

}

渲染

import (
	"io/ioutil"
	"log"
	"os"
	"path"
	"text/template"
)


func RenderFile(v []TerraFormBaseTemplateModel) error {
	workDir, _ := ioutil.TempDir("", "terraform")

	tmpl, err := template.New("").Parse(TerraformBaseTemplate)
	if err != nil {
		log.Println("template.New, err:", err)
		return err
	}

	f, err := os.OpenFile(path.Join(WorkDir, "terraform.tf"), os.O_WRONLY|os.O_CREATE, 0644)
	defer f.Close()
	if err != nil {
		log.Println(err)
		return err
	}

	if err = tmpl.Execute(f, v); err != nil {
		log.Println(err)
		return err
	}
	return nil
}