site/vendor/github.com/Xe/ln/ex/gotrace.go

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2017-12-13 18:43:58 +00:00
package ex
import (
"context"
"log"
"github.com/Xe/ln"
"golang.org/x/net/trace"
)
type goEventLogger struct {
ev trace.EventLog
}
// NewGoEventLogger will log ln information to a given trace.EventLog instance.
func NewGoEventLogger(ev trace.EventLog) ln.Filter {
return &goEventLogger{ev: ev}
}
func (gel *goEventLogger) Apply(ctx context.Context, e ln.Event) bool {
data, err := ln.DefaultFormatter.Format(ctx, e)
if err != nil {
log.Printf("wtf: error in log formatting: %v", err)
return false
}
if everr := e.Data["err"]; everr != nil {
gel.ev.Errorf("%s", string(data))
return true
}
gel.ev.Printf("%s", string(data))
return true
}
func (gel *goEventLogger) Close() { gel.ev.Finish() }
func (gel *goEventLogger) Run() {}
type sst string
func (s sst) String() string { return string(s) }
func goTraceLogger(ctx context.Context, e ln.Event) bool {
sp, ok := trace.FromContext(ctx)
if !ok {
return true // no trace in context
}
data, err := ln.DefaultFormatter.Format(ctx, e)
if err != nil {
log.Printf("wtf: error in log formatting: %v", err)
return false
}
if everr := e.Data["err"]; everr != nil {
sp.SetError()
}
sp.LazyLog(sst(string(data)), false)
return true
}
// NewGoTraceLogger will log ln information to a golang.org/x/net/trace.Trace
// if it is present in the context of ln calls.
func NewGoTraceLogger() ln.Filter {
return ln.FilterFunc(goTraceLogger)
}