func (r *StaticBinaryResult) Apply(req *revel.Request, resp *revel.Response) {
// If we have a ReadSeeker, delegate to http.ServeContent
if rs, ok := r.Reader.(io.ReadSeeker); ok {
// http.ServeContent doesn't know about response.ContentType, so we set the respective header.
if resp.ContentType != "" {
resp.Out.Header().Set("Content-Type", resp.ContentType)
} else {
contentType := revel.ContentTypeByFilename(r.Name)
resp.Out.Header().Set("Content-Type", contentType)
}
http.ServeContent(resp.Out, req.Request, r.Name, r.ModTime, rs)
} else {
// Else, do a simple io.Copy.
if r.Length != -1 {
resp.Out.Header().Set("Content-Length", strconv.FormatInt(r.Length, 10))
}
resp.WriteHeader(http.StatusOK, revel.ContentTypeByFilename(r.Name))
io.Copy(resp.Out, r.Reader)
}
// Close the Reader if we can
if v, ok := r.Reader.(io.Closer); ok {
v.Close()
}
}
// 错误显示出
func (r ErrorResult) Apply(req *revel.Request, resp *revel.Response) {
format := req.Format
status := resp.Status
if status == 0 {
status = http.StatusInternalServerError
}
contentType := revel.ContentTypeByFilename("xxx." + format)
if contentType == revel.DefaultFileContentType {
contentType = "text/plain"
}
// Get the error template.
var err error
templatePath := fmt.Sprintf("errors/%d.%s", status, format)
err = nil
// tmpl, err := revel.MainTemplateLoader.Template("index.html") // 这里找到错误页面主题
// This func shows a plaintext error message, in case the template rendering
// doesn't work.
showPlaintext := func(err error) {
revel.PlaintextErrorResult{fmt.Errorf("Server Error:\n%s\n\n"+
"Additionally, an error occurred when rendering the error page:\n%s",
r.Error, err)}.Apply(req, resp)
}
// 根据是否是preview来得到404模板
// 是, 则显示系统的错误信息, blog-500.html
var tmpl *template.Template
if r.IsPreview {
tmpl = r.CurBlogTpl.Template.Lookup("blog/404.html")
} else {
tmpl = r.CurBlogTpl.Template.Lookup("404.html")
}
if tmpl == nil {
if err == nil {
err = fmt.Errorf("Couldn't find template %s", templatePath)
}
showPlaintext(err)
return
}
// If it's not a revel error, wrap it in one.
var revelError *revel.Error
switch e := r.Error.(type) {
case *revel.Error:
revelError = e
case error:
revelError = &revel.Error{
Title: "Server Error",
Description: e.Error(),
}
}
if revelError == nil {
panic("no error provided")
}
if r.RenderArgs == nil {
r.RenderArgs = make(map[string]interface{})
}
r.RenderArgs["Error"] = revelError
r.RenderArgs["Router"] = revel.MainRouter
// 不是preview就不要显示错误了
if r.IsPreview {
var b bytes.Buffer
out := io.Writer(resp.Out)
// out = ioutil.Discard
err = tmpl.Execute(&b, r.RenderArgs)
resp.WriteHeader(http.StatusOK, "text/html; charset=utf-8")
b.WriteTo(out)
}
}