加载前端 SPA 资源

示例代码

package controller

import (
	"net/http"
	"strings"

	"github.com/sohaha/zlsgo/zarray"
	"github.com/sohaha/zlsgo/zfile"
	"github.com/sohaha/zlsgo/znet"
	"github.com/sohaha/zlsgo/zutil"
	"github.com/sohaha/zstatic"
	"github.com/sohaha/zstatic/build"
	"github.com/zlsgo/app_core/service"
)

type Dashboard struct {
	service.App
}

// Dashboarder dashboard 文件服务器
type Dashboarder struct {
	cache *zarray.Maper[string, []byte]
	group *build.FileGroup
}

// dashboardFileserver 初始化 dashboard 文件服务器
var dashboardFileserver = zutil.Once(func() *Dashboarder {
  // 前端打包编译出来的文件夹
	group, _ := zstatic.Group("../frontend/dist")
	return &Dashboarder{
		cache: zarray.NewHashMap[string, []byte](),
		group: group,
	}
})

// ReadDashboardFile 读取 dashboard 文件
// 另外还需要把 404 处理交给 dashboard 文件服务器
func ReadDashboardFile(c *znet.Context, prefix string) (err error) {
	name := c.GetParam("file")
	nameNil := name == ""
	if !nameNil {
		name = strings.TrimPrefix(name, "/")
	} else if nameNil {
		name = c.Request.URL.Path
	}

	name = zarray.Join([]string{prefix, name}, "/")
	b, _, _ := dashboardFileserver().cache.ProvideGet(name, func() (b []byte, ok bool) {
		possiblePaths := []string{
			name,
			name + ".html",
			name + "/index.html",
			"404.html",
		}
		for _, path := range possiblePaths {
			if b, err = dashboardFileserver().group.MustBytes(path); err == nil {
				break
			}
		}

		return b, err == nil
	})

	if err != nil {
		return err
	}

	c.SetContentType(zfile.GetMimeType(name, b))
	c.SetHeader("Cache-Control", "max-age=14400")
	c.Byte(http.StatusOK, b)

	return nil
}

// Init 初始化 dashboard 路由
func (h *Dashboard) Init(r *znet.Engine) error {
	// 处理 dashboard 文件
	r.Any("{file:.*}", func(c *znet.Context) error {
		return ReadDashboardFile(c, "/dashboard")
	})
	return nil
}