refactor: move docker/idlewatcher to idlewatcher

internal/idlewatcher/loading_page.go

@@ -0,0 +1,35 @@
+package idlewatcher
+
+import (
+	"bytes"
+	_ "embed"
+	"text/template"
+
+	"github.com/yusing/go-proxy/internal/net/gphttp/httpheaders"
+)
+
+type templateData struct {
+	CheckRedirectHeader string
+	Title               string
+	Message             string
+}
+
+//go:embed html/loading_page.html
+var loadingPage []byte
+var loadingPageTmpl = template.Must(template.New("loading_page").Parse(string(loadingPage)))
+
+func (w *Watcher) makeLoadingPageBody() []byte {
+	msg := w.ContainerName() + " is starting..."
+
+	data := new(templateData)
+	data.CheckRedirectHeader = httpheaders.HeaderGoDoxyCheckRedirect
+	data.Title = w.route.HomepageItem().Name
+	data.Message = msg
+
+	buf := bytes.NewBuffer(make([]byte, len(loadingPage)+len(data.Title)+len(data.Message)+len(httpheaders.HeaderGoDoxyCheckRedirect)))
+	err := loadingPageTmpl.Execute(buf, data)
+	if err != nil { // should never happen in production
+		panic(err)
+	}
+	return buf.Bytes()
+}