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logger.go
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logger.go
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package handler
import (
"net"
"net/http"
"time"
gopi "github.com/djthorpe/gopi/v3"
)
/////////////////////////////////////////////////////////////////////
// TYPES
type Logger struct {
gopi.Unit
gopi.Server
gopi.Metrics
}
type LoggerHandler struct {
*Logger
name string
http.Handler
}
// Register a service which logs metrics
func (this *Logger) Log(name string) error {
tags := []gopi.Field{
this.Metrics.Field("method", ""),
this.Metrics.Field("url", ""),
this.Metrics.Field("host", ""),
this.Metrics.Field("path", ""),
this.Metrics.Field("query", ""),
this.Metrics.Field("remoteAddr", ""),
}
if this.Server == nil {
return gopi.ErrInternalAppError.WithPrefix("Server")
} else if this.Metrics == nil {
return gopi.ErrInternalAppError.WithPrefix("Metrics")
} else if _, err := this.Metrics.NewMeasurement(name, "latency float64,useragent string", tags...); err != nil {
return err
} else if err := this.Server.RegisterService(nil, &LoggerHandler{this, name, nil}); err != nil {
return err
}
// Return success
return nil
}
// Set handler
func (this *LoggerHandler) SetHandler(handler http.Handler) {
this.Handler = handler
}
// Log metrics
func (this *LoggerHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
now := time.Now()
if this.Handler != nil {
this.Handler.ServeHTTP(w, req)
}
// TAGS
tags := []gopi.Field{
this.Metrics.Field("method", req.Method),
this.Metrics.Field("url", req.RequestURI),
this.Metrics.Field("host", req.Host),
this.Metrics.Field("path", req.URL.Path),
this.Metrics.Field("query", req.URL.RawQuery),
}
if host, _, err := net.SplitHostPort(req.RemoteAddr); err == nil {
tags = append(tags, this.Metrics.Field("remoteAddr", host))
}
/* for k, v := range w.Header() {
fmt.Println("response header", k, v)
}
*/
// Emit Metrics
this.Metrics.EmitTS(this.name, now, tags, time.Since(now).Seconds(), req.UserAgent())
}