/
output_broker_fan_out.go
131 lines (114 loc) · 2.9 KB
/
output_broker_fan_out.go
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package pure
import (
"context"
"sync/atomic"
"time"
"github.com/Jeffail/shutdown"
"github.com/benthosdev/benthos/v4/internal/component"
"github.com/benthosdev/benthos/v4/internal/component/output"
"github.com/benthosdev/benthos/v4/internal/message"
)
type fanOutOutputBroker struct {
transactions <-chan message.Transaction
outputTSChans []chan message.Transaction
outputs []output.Streamed
shutSig *shutdown.Signaller
}
func newFanOutOutputBroker(outputs []output.Streamed) (*fanOutOutputBroker, error) {
o := &fanOutOutputBroker{
transactions: nil,
outputs: outputs,
shutSig: shutdown.NewSignaller(),
}
o.outputTSChans = make([]chan message.Transaction, len(o.outputs))
for i := range o.outputTSChans {
o.outputTSChans[i] = make(chan message.Transaction)
if err := o.outputs[i].Consume(o.outputTSChans[i]); err != nil {
return nil, err
}
}
return o, nil
}
func (o *fanOutOutputBroker) Consume(transactions <-chan message.Transaction) error {
if o.transactions != nil {
return component.ErrAlreadyStarted
}
o.transactions = transactions
go o.loop()
return nil
}
func (o *fanOutOutputBroker) Connected() bool {
for _, out := range o.outputs {
if !out.Connected() {
return false
}
}
return true
}
func (o *fanOutOutputBroker) loop() {
ackInterruptChan := make(chan struct{})
var ackPending int64
defer func() {
// Wait for pending acks to be resolved, or forceful termination
ackWaitLoop:
for atomic.LoadInt64(&ackPending) > 0 {
select {
case <-ackInterruptChan:
case <-time.After(time.Millisecond * 100):
// Just incase an interrupt doesn't arrive.
case <-o.shutSig.HardStopChan():
break ackWaitLoop
}
}
for _, c := range o.outputTSChans {
close(c)
}
_ = closeAllOutputs(context.Background(), o.outputs)
o.shutSig.TriggerHasStopped()
}()
for {
var ts message.Transaction
var open bool
select {
case ts, open = <-o.transactions:
if !open {
return
}
case <-o.shutSig.HardStopChan():
return
}
_ = atomic.AddInt64(&ackPending, 1)
pendingResponses := int64(len(o.outputTSChans))
for target := range o.outputTSChans {
msgCopy, i := ts.Payload.ShallowCopy(), target
select {
case o.outputTSChans[i] <- message.NewTransactionFunc(msgCopy, func(ctx context.Context, err error) error {
if atomic.AddInt64(&pendingResponses, -1) == 0 || err != nil {
atomic.StoreInt64(&pendingResponses, 0)
ackErr := ts.Ack(ctx, err)
_ = atomic.AddInt64(&ackPending, -1)
select {
case ackInterruptChan <- struct{}{}:
default:
}
return ackErr
}
return nil
}):
case <-o.shutSig.HardStopChan():
return
}
}
}
}
func (o *fanOutOutputBroker) TriggerCloseNow() {
o.shutSig.TriggerHardStop()
}
func (o *fanOutOutputBroker) WaitForClose(ctx context.Context) error {
select {
case <-o.shutSig.HasStoppedChan():
case <-ctx.Done():
return ctx.Err()
}
return nil
}