一个通用的 http 处理程序而不是几个
one common http handler instead of several
是否可以在这段代码中不复制粘贴表达式 commonHanlder(handler1)
、commonHanlder(handler2)
... commonHanlder(handlerN)
:
rtr.HandleFunc("/", commonHanlder(handler1)).Methods("GET")
rtr.HandleFunc("/page2", commonHanlder(handler2)).Methods("GET")
并像
一样将其设置在一个地方
http.ListenAndServe(":3000", commonHanlder(http.DefaultServeMux))
但是这个变体不起作用并且在编译时给出了两个错误:
./goRelicAndMux.go:20: cannot use http.DefaultServeMux (type *http.ServeMux) as type gorelic.tHTTPHandlerFunc in argument to commonHanlder
./goRelicAndMux.go:20: cannot use commonHanlder(http.DefaultServeMux) (type gorelic.tHTTPHandlerFunc) as type http.Handler in argument to http.ListenAndServe:
gorelic.tHTTPHandlerFunc does not implement http.Handler (missing ServeHTTP method)
完整代码:
package main
import (
"github.com/gorilla/mux"
"github.com/yvasiyarov/gorelic"
"log"
"net/http"
)
func main() {
initNewRelic()
rtr := mux.NewRouter()
var commonHanlder = agent.WrapHTTPHandlerFunc
rtr.HandleFunc("/", commonHanlder(handler1)).Methods("GET")
rtr.HandleFunc("/page2", commonHanlder(handler2)).Methods("GET")
http.Handle("/", rtr)
log.Println("Listening...")
http.ListenAndServe(":3000", http.DefaultServeMux)
}
func handler1(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("mainPage"))
}
func handler2(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("page 2"))
}
var agent *gorelic.Agent
func initNewRelic() {
agent = gorelic.NewAgent()
agent.Verbose = true
agent.NewrelicName = "test"
agent.NewrelicLicense = "new relic key"
agent.Run()
}
您似乎想在应用程序的根目录上调用 commonHandler 并使其适用于所有应用程序。由于您使用的是 mux,因此只需将 mux 路由器包装一次即可。
func main() {
initNewRelic()
rtr := mux.NewRouter()
var commonHandler = agent.WrapHTTPHandler
rtr.HandleFunc("/", handler1).Methods("GET")
rtr.HandleFunc("/page2", handler2).Methods("GET")
http.Handle("/", commonHandler(rtr))
log.Println("Listening...")
http.ListenAndServe(":3000", nil)
}
我还删除了 ListenAndServe 中的 http.DefaultServeMux 引用,因为传递 nil 将自动使用默认值。
是否可以在这段代码中不复制粘贴表达式 commonHanlder(handler1)
、commonHanlder(handler2)
... commonHanlder(handlerN)
:
rtr.HandleFunc("/", commonHanlder(handler1)).Methods("GET")
rtr.HandleFunc("/page2", commonHanlder(handler2)).Methods("GET")
并像
一样将其设置在一个地方http.ListenAndServe(":3000", commonHanlder(http.DefaultServeMux))
但是这个变体不起作用并且在编译时给出了两个错误:
./goRelicAndMux.go:20: cannot use http.DefaultServeMux (type *http.ServeMux) as type gorelic.tHTTPHandlerFunc in argument to commonHanlder
./goRelicAndMux.go:20: cannot use commonHanlder(http.DefaultServeMux) (type gorelic.tHTTPHandlerFunc) as type http.Handler in argument to http.ListenAndServe:
gorelic.tHTTPHandlerFunc does not implement http.Handler (missing ServeHTTP method)
完整代码:
package main
import (
"github.com/gorilla/mux"
"github.com/yvasiyarov/gorelic"
"log"
"net/http"
)
func main() {
initNewRelic()
rtr := mux.NewRouter()
var commonHanlder = agent.WrapHTTPHandlerFunc
rtr.HandleFunc("/", commonHanlder(handler1)).Methods("GET")
rtr.HandleFunc("/page2", commonHanlder(handler2)).Methods("GET")
http.Handle("/", rtr)
log.Println("Listening...")
http.ListenAndServe(":3000", http.DefaultServeMux)
}
func handler1(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("mainPage"))
}
func handler2(w http.ResponseWriter, r *http.Request) {
w.Write([]byte("page 2"))
}
var agent *gorelic.Agent
func initNewRelic() {
agent = gorelic.NewAgent()
agent.Verbose = true
agent.NewrelicName = "test"
agent.NewrelicLicense = "new relic key"
agent.Run()
}
您似乎想在应用程序的根目录上调用 commonHandler 并使其适用于所有应用程序。由于您使用的是 mux,因此只需将 mux 路由器包装一次即可。
func main() {
initNewRelic()
rtr := mux.NewRouter()
var commonHandler = agent.WrapHTTPHandler
rtr.HandleFunc("/", handler1).Methods("GET")
rtr.HandleFunc("/page2", handler2).Methods("GET")
http.Handle("/", commonHandler(rtr))
log.Println("Listening...")
http.ListenAndServe(":3000", nil)
}
我还删除了 ListenAndServe 中的 http.DefaultServeMux 引用,因为传递 nil 将自动使用默认值。