整合uber-go/zap记录事件

HTTP Dispatcher只有事件的概念，事件触发后如何处理则由开发者自行决定，此处演示使用uber-go/zap这个包记录404、405、500事件：

package main
 
import (
    "github.com/dxvgef/httpdispatcher"
    "go.uber.org/zap"
    "net/http"
    "log"
)
 
//zap记录器的实例
var Logger *zap.Logger
 
func main()  {
    var dispatcher = httpdispatcher.New()
 
    Logger, _ = zap.NewDevelopment()
 
    //注册事件处理器
    dispatcher.Event.Handler = func(event *httpdispatcher.Event) {
        event.ResponseWriter.WriteHeader(event.Status)
        event.ResponseWriter.Write([]byte(event.Message))
        Logger.Error(
            event.Message.Error(),
            zap.Int("status", event.Status),
            zap.String("method", event.Request.Method),
            zap.String("uri", event.Request.RequestURI),
            zap.Strings("trace", event.Trace),
        )
    }
 
    if err := http.ListenAndServe(":8080", dispatcher); err != nil {
        log.Fatal(err.Error())
    }
}