大猩猩处理程序将内容写入文件。

huangapple
go评论116阅读模式
英文:

gorilla handlers write to file

问题

  1. import (
  2. 	"github.com/gorilla/handlers"
  3. )
  5. func main(){
  6. 	...
  7. 	
  8. 	err := http.ListenAndServe(":9000", access_log(r))
  9. 	if err != nil {
  10. 		log.Fatal("HTTP server: ", err)
  11. 	}
  12. }
  14. func access_log(r http.Handler) http.Handler {
  15. 	f, err := os.OpenFile("log/access.log", os.O_CREATE | os.O_WRONLY | os.O_APPEND, 0666)
  16. 	if err != nil {
  17. 		log.Panic("Access log: ", err)
  18. 	}
  19. 	
  20. 	return handlers.LoggingHandler(io.Writer(f), r)
  21. }

文件已创建，但每次请求时没有写入文件。

#更新

当输出写入os.Stdout时，这个方法可以工作。

  1. func access_log(r http.Handler) http.Handler {
  2. 	/*f, err := os.OpenFile("log/access.log", os.O_CREATE | os.O_WRONLY | os.O_APPEND, 0666)
  3. 	if err != nil {
  4. 		log.Panic("Access log: ", err)
  5. 	}
  6. 	
  7. 	return handlers.LoggingHandler(io.Writer(f), r)*/
  8. 	
  9. 	return handlers.LoggingHandler(os.Stdout, r)
  10. }

#更新 II

  1. func main(){
  2. 	runtime.GOMAXPROCS(runtime.NumCPU())
  3. 	
  4. 	r := mux.NewRouter()
  5. 	
  6. 	www := r.Host("secure.domain.com").Subrouter()
  7. 	www.HandleFunc("/", Handler_www)
  8. 	
  9. 	api := r.Host("api.domain.com").Subrouter()
  10. 	api.HandleFunc("/", Handler_api)
  11. 	
  12. 	err := http.ListenAndServe(":9000", access_log(r))
  13. 	if err != nil {
  14. 		log.Fatal("HTTP server: ", err)
  15. 	}
  16. }
  18. func access_log(r http.Handler) http.Handler {
  19. 	f, err := os.OpenFile("log/access.log", os.O_CREATE | os.O_WRONLY | os.O_APPEND, 0666)
  20. 	if err != nil {
  21. 		log.Panic("Access log: ", err)
  22. 	}
  23. 	
  24. 	return handlers.LoggingHandler(f, r)
  25. }
英文: 
  1. import (
  2. 	"github.com/gorilla/handlers"
  3. )
  5. func main(){
  6. 	...
  7. 	
  8. 	err := http.ListenAndServe(":9000", access_log(r))
  9. 	if err != nil {
  10. 		log.Fatal("HTTP server: ", err)
  11. 	}
  12. }
  14. func access_log(r http.Handler) http.Handler {
  15. 	f, err := os.OpenFile("log/access.log", os.O_CREATE | os.O_WRONLY | os.O_APPEND, 0666)
  16. 	if err != nil {
  17. 		log.Panic("Access log: ", err)
  18. 	}
  19. 	
  20. 	return handlers.LoggingHandler(io.Writer(f), r)
  21. }

The file is created but nothing is written to the file on each request

#update

This works when the output is written to os.Stdout

  1. func access_log(r http.Handler) http.Handler {
  2. 	/*f, err := os.OpenFile("log/access.log", os.O_CREATE | os.O_WRONLY | os.O_APPEND, 0666)
  3. 	if err != nil {
  4. 		log.Panic("Access log: ", err)
  5. 	}
  6. 	
  7. 	return handlers.LoggingHandler(io.Writer(f), r)*/
  8. 	
  9. 	return handlers.LoggingHandler(os.Stdout, r)
  10. }

#update II

  1. func main(){
  2. 	runtime.GOMAXPROCS(runtime.NumCPU())
  3. 	
  4. 	r := mux.NewRouter()
  5. 	
  6. 	www := r.Host("secure.domain.com").Subrouter()
  7. 	www.HandleFunc("/", Handler_www)
  8. 	
  9. 	api := r.Host("api.domain.com").Subrouter()
  10. 	api.HandleFunc("/", Handler_api)
  11. 	
  12. 	err := http.ListenAndServe(":9000", access_log(r))
  13. 	if err != nil {
  14. 		log.Fatal("HTTP server: ", err)
  15. 	}
  16. }
  18. func access_log(r http.Handler) http.Handler {
  19. 	f, err := os.OpenFile("log/access.log", os.O_CREATE | os.O_WRONLY | os.O_APPEND, 0666)
  20. 	if err != nil {
  21. 		log.Panic("Access log: ", err)
  22. 	}
  23. 	
  24. 	return handlers.LoggingHandler(f, r)
  25. }

答案1

得分: 4

尝试从一个工作示例开始，如“制作和使用HTTP中间件”中所述：

  1. package main
  3. import (
  4.   "github.com/gorilla/handlers"
  5.   "net/http"
  6.   "os"
  7. )
  9. func main() {
  10.   finalHandler := http.HandlerFunc(final)
  12.   logFile, err := os.OpenFile("server.log", os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0666)
  13.   if err != nil {
  14.     panic(err)
  15.   }
  17.   http.Handle("/", handlers.LoggingHandler(logFile, finalHandler))
  18.   http.ListenAndServe(":3000", nil)
  19. }
  21. func final(w http.ResponseWriter, r *http.Request) {
  22.   w.Write([]byte("OK"))
  23. }

handlers.LoggingHandler() 直接使用文件，而不是 io.Writer(f)。

在你的情况下：

  1. return handlers.LoggingHandler(f, r)
英文:

Try starting from a working example, as described in "Making and Using HTTP Middleware":

  1. package main
  3. import (
  4.   "github.com/gorilla/handlers"
  5.   "net/http"
  6.   "os"
  7. )
  9. func main() {
  10.   finalHandler := http.HandlerFunc(final)
  12.   logFile, err := os.OpenFile("server.log", os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0666)
  13.   if err != nil {
  14.     panic(err)
  15.   }
  17.   http.Handle("/", handlers.LoggingHandler(logFile, finalHandler))
  18.   http.ListenAndServe(":3000", nil)
  19. }
  21. func final(w http.ResponseWriter, r *http.Request) {
  22.   w.Write([]byte("OK"))
  23. }

The handlers.LoggingHandler() uses the file directly, not io.Writer(f).

In your case:

  1. return handlers.LoggingHandler(f, r)

huangapple
  • 本文由 发表于 2015年4月13日 18:48:49
  • 转载请务必保留本文链接：https://go.coder-hub.com/29603488.html
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