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passthrough.go
60 lines (53 loc) · 1.15 KB
/
passthrough.go
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package ingest
// passthrough is an empty runner that will emit records to a channel
type passthrough struct {
name string
out chan interface{}
noClose bool
}
func newPassthrough(name string, out chan interface{}, noClose bool) *passthrough {
return &passthrough{name, out, noClose}
}
// Name implements the Runner interfacce for passthrough
func (p *passthrough) Name() string {
return p.name
}
// Run implements the Runner interface for passthrough
func (p *passthrough) Run(stage *Stage) error {
defer func() {
if !p.noClose {
close(p.out)
}
}()
for {
select {
case <-stage.Abort:
return nil
case rec, ok := <-stage.In:
if !ok {
return nil
}
select {
case <-stage.Abort:
return nil
case p.out <- rec:
if stage.Out != nil {
select {
case <-stage.Abort:
return nil
case stage.Out <- rec:
continue
}
}
}
}
}
}
// SkipAbortErr saves us having to send nil errors back on abort
func (p *passthrough) SkipAbortErr() bool {
return true
}
// PassOnAddTarget makes it so that a passthrough stream is not targeted
func (p *passthrough) PassOnAddTarget() bool {
return true
}