根据错误代码加载模板。

huangapple
go评论114阅读模式
英文:

go: load templates based on error code

问题

我想根据HTTP错误代码执行不同的模板。

我考虑使用template.ParseFiles()，但我不确定如何动态地实现这一点。实际上，ParseFiles()可以加载一个字符串数组（文件名）。

我是否需要为每个文件单独调用ParseFiles()，以便将其结果分配给映射中的错误代码？如果我将所有文件都ParseFiles()到一个数组中，那么如何将每个模板分配给错误代码？

我希望避免在每个请求上都执行ParseFiles()，我更希望在init()中进行解析，并且仅在请求时执行Execute。

以下是我目前的代码（尚未编译）：

  1. package main
  3. import (
  4. 	"os"
  5. 	"html/template"
  6. 	"net/http"
  7. )
  9. var templateMap map[int]*template.Template
  11. func init() {
  12.   initErrHandling()
  13. }
  15. func initErrHandling() {
  16.   
  17.   templateMap = make(map[int]*template.Template)
  18.   templateMap[0]   = "generic.html" //默认模板
  19.   templateMap[400] = "generic.html"
  20.   templateMap[401] = "unauthorized.html"
  21.   templateMap[403] = "forbidden.html"
  22.   templateMap[404] = "notfound.html"
  23.   templateMap[422] = "invalidparams.html"
  24.   templateMap[500] = "generic.html"
  25.   
  26.   template.ParseFiles() //一次性解析所有文件，或者逐个解析文件并将其分配给错误代码，例如 templateMap[404],_ = template.parseFiles("notfound.html")? 
  27. }
  30. func getTemplate(code int) (*template.Template) {
  31.   if val, tmpl := templateMap[code]; tmpl {
  32.     return tmpl
  33.   } else {
  34.     return templateMap[0]
  35.   }
  36. }
  38. func showError(w http.ResponseWriter, code int) {
  39. 	getTemplate(code).Execute(w)	
  40. } 
  42. func main() {
  43. 	showError(os.Stdout, 400)
  44. }

请注意，这只是一个示例代码，尚未编译。你需要根据你的实际需求进行适当的修改和调试。

英文:

I would like to Execute a different template based on a http error code.

I was thinking to use template.ParseFiles(), but I am confused how to do this dynamically. In fact, ParseFiles() can load an array of strings (filenames).

Do I have to ParseFiles() for every file individually, in order to assign its result to an error code in a map? If I ParseFiles() all into an array, how can I then assign each of the templates to the error code?

I would like to avoid having to ParseFiles() on each request, I would prefer to do the parsing in init() and Execute only on request.

Here's what I have so far (does not compile yet):

  1. package main
  3. import (
  4. 	"os"
  5. 	"html/template"
  6. 	"net/http"
  7. )
  9. var templateMap map[int]*template.Template
  11. func init() {
  12.   initErrHandling()
  13. }
  15. func initErrHandling() {
  16.   
  17.   templateMap = make(map[int]*template.Template)
  18.   templateMap[0]   = "generic.html" //default
  19.   templateMap[400] = "generic.html"
  20.   templateMap[401] = "unauthorized.html"
  21.   templateMap[403] = "forbidden.html"
  22.   templateMap[404] = "notfound.html"
  23.   templateMap[422] = "invalidparams.html"
  24.   templateMap[500] = "generic.html"
  25.   
  26.   template.ParseFiles() //parseFiles all files in one call, or parseFiles one by one and assign to error code, e.g. templateMap[404],_ = template.parseFiles("notfound.html")? 
  27. }
  30. func getTemplate(code int) (*template.Template) {
  31.   if val, tmpl := templateMap[code]; tmpl {
  32.     return tmpl
  33.   } else {
  34.     return templateMap[0]
  35.   }
  36. }
  38. func showError(w http.ResponseWriter, code int) {
  39. 	getTemplate(code).Execute(w)	
  40. } 
  42. func main() {
  43. 	showError(os.Stdout, 400)
  44. }

答案1

得分: 2

使用一个映射来记录文件名，使用第二个映射来记录解析后的模板：

  1. func initErrHandling() {  // 从init()函数中调用
  2.   fnames := map[int]string{
  3.     0:   "generic.html", // 默认
  4.     400: "generic.html",
  5.     401: "unauthorized.html",
  6.     403: "forbidden.html",
  7.     404: "notfound.html",
  8.     422: "invalidparams.html",
  9.     500: "generic.html",
  10.   }
  11.   templateMap = make(map[int]*template.Template)
  12.   for code, fname := range fnames {
  13.     templateMap[code] = template.Must(template.ParseFiles(fname))
  14.   }
  15. }
英文:

Use one map to record the file names and a second map for the parsed templates:

  1. func initErrHandling() {  // call from init()
  2.   fnames := map[int]string{
  3. 	0:   "generic.html", //default
  4. 	400: "generic.html",
  5. 	401: "unauthorized.html",
  6. 	403: "forbidden.html",
  7. 	404: "notfound.html",
  8. 	422: "invalidparams.html",
  9. 	500: "generic.html",
  10.   }
  11.   templateMap = make(map[int]*template.Template)
  12.   for code, fname := range fnames {
  13. 	templateMap[code] = template.Must(template.ParseFiles(fname))
  14.   }
  16. }

huangapple
  • 本文由 发表于 2017年3月11日 04:07:29
  • 转载请务必保留本文链接：https://go.coder-hub.com/42726871.html
  • dictionary
  • go
  • templates
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