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output.go
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output.go
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package clog
import (
"fmt"
"runtime"
"sync"
"github.com/iheartradio/cog/cio/eio"
)
type privOutput struct {
eio.Producer
Formatter
data Data
l *Log
wg *sync.WaitGroup
filts filterSlice
}
// outputs are tricky business: they can be used without a lock in many
// goroutines, so they're not safe to close until no one is using them: a
// finalizer is required.
type output struct {
*privOutput
}
func newOutput(oc *OutputConfig, l *Log, wg *sync.WaitGroup) (o *output, err error) {
po := &privOutput{
data: Data{
"prod": oc.Prod,
"prodArgs": fmt.Sprintf("%+v", oc.ProdArgs),
"fmt": oc.Fmt,
"fmtArgs": fmt.Sprintf("%+v", oc.FmtArgs),
},
l: l,
wg: wg,
}
wg.Add(1)
defer func() {
if err != nil {
po.exit()
o = nil
}
}()
po.Formatter, err = newFormatter(oc.Fmt, oc.FmtArgs)
if err != nil {
return
}
if oc.ProdArgs == nil {
oc.ProdArgs = eio.Args{}
}
oc.ProdArgs["MimeType"] = po.Formatter.MimeType()
po.Producer, err = eio.NewProducer(oc.Prod, oc.ProdArgs)
if err != nil {
return
}
po.filts, err = newFilters(oc.Level, oc.Filters)
if err != nil {
return
}
wg.Add(1)
go po.monitor()
o = &output{po}
runtime.SetFinalizer(o, finalizeOutput)
return
}
func finalizeOutput(o *output) {
go o.exit()
}
// May only be used by *privOutput itself.
func (po *privOutput) exit() {
if po.Producer != nil {
errs := po.Producer.Close()
if !errs.Empty() {
po.logErr(errs.Error())
}
}
for _, f := range po.filts {
f.Exit()
}
po.wg.Done()
}
func (po *privOutput) logErr(err error) {
if err != nil {
po.l.LogEntry(Entry{
Level: Error,
Depth: 1,
Msg: fmt.Sprintf("failed to write log entry: %v", err),
Data: po.data,
ignoreErrors: true,
})
}
}
func (po *privOutput) monitor() {
defer po.wg.Done()
for err := range po.Errs() {
po.logErr(err)
}
}