func (p *syncPublisher) send(m message) bool {
if p.pub.disabled {
debug("publisher disabled")
outputs.SignalCompleted(m.context.signal)
return true
}
signal := m.context.signal
sync := outputs.NewSyncSignal()
if len(p.pub.Output) > 1 {
m.context.signal = outputs.NewSplitSignaler(sync, len(p.pub.Output))
} else {
m.context.signal = sync
}
for _, o := range p.pub.Output {
o.send(m)
}
ok := sync.Wait()
if ok {
outputs.SignalCompleted(signal)
} else if signal != nil {
signal.Failed()
}
return ok
}
func (c *console) PublishEvent(
s outputs.Signaler,
opts outputs.Options,
event common.MapStr,
) error {
var jsonEvent []byte
var err error
if c.config.Pretty {
jsonEvent, err = json.MarshalIndent(event, "", " ")
} else {
jsonEvent, err = json.Marshal(event)
}
if err != nil {
logp.Err("Fail to convert the event to JSON: %s", err)
outputs.SignalCompleted(s)
return err
}
if err = writeBuffer(jsonEvent); err != nil {
goto fail
}
if err = writeBuffer([]byte{'\n'}); err != nil {
goto fail
}
outputs.SignalCompleted(s)
return nil
fail:
if opts.Guaranteed {
logp.Critical("Unable to publish events to console: %v", err)
}
outputs.SignalFailed(s, err)
return err
}
func (c *console) PublishEvent(
s outputs.Signaler,
ts time.Time,
event common.MapStr,
) error {
var jsonEvent []byte
var err error
if c.pretty {
jsonEvent, err = json.MarshalIndent(event, "", " ")
} else {
jsonEvent, err = json.Marshal(event)
}
if err != nil {
logp.Err("Fail to convert the event to JSON: %s", err)
outputs.SignalCompleted(s)
return err
}
if err = writeBuffer(jsonEvent); err != nil {
goto fail
}
if err = writeBuffer([]byte{'\n'}); err != nil {
goto fail
}
outputs.SignalCompleted(s)
return nil
fail:
outputs.SignalFailed(s, err)
return err
}
func (out *fileOutput) PublishEvent(
trans outputs.Signaler,
opts outputs.Options,
event common.MapStr,
) error {
jsonEvent, err := json.Marshal(event)
if err != nil {
// mark as success so event is not sent again.
outputs.SignalCompleted(trans)
logp.Err("Fail to convert the event to JSON: %s", err)
return err
}
err = out.rotator.WriteLine(jsonEvent)
if err != nil {
if opts.Guaranteed {
logp.Critical("Unable to write events to file: %s", err)
} else {
logp.Err("Error when writing line to file: %s", err)
}
}
outputs.Signal(trans, err)
return err
}
func (mh *testMessageHandler) acknowledgeMessage(m message) {
if mh.response == CompletedResponse {
outputs.SignalCompleted(m.context.signal)
} else {
outputs.SignalFailed(m.context.signal, nil)
}
}
func (o *outputWorker) onBulk(ctx *context, events []common.MapStr) {
if len(events) == 0 {
debug("output worker: no events to publish")
outputs.SignalCompleted(ctx.signal)
return
}
var sync *outputs.SyncSignal
if ctx.sync {
sync = outputs.NewSyncSignal()
}
if o.maxBulkSize < 0 || len(events) <= o.maxBulkSize {
o.sendBulk(sync, ctx, events)
return
}
// start splitting bulk request
splits := (len(events) + (o.maxBulkSize - 1)) / o.maxBulkSize
ctx.signal = outputs.NewSplitSignaler(ctx.signal, splits)
for len(events) > 0 {
sz := o.maxBulkSize
if sz > len(events) {
sz = len(events)
}
o.sendBulk(sync, ctx, events[:sz])
events = events[sz:]
}
}
// publish is used to publish events using the configured protocol client.
// It provides general error handling and back off support used on failed
// send attempts. To be used by PublishEvent and PublishEvents.
// The send callback will try to progress sending traffic and returns kind of
// progress made in ok or resetFail. If ok is set to true, send finished
// processing events. If ok is false but resetFail is set, send was partially
// successful. If send was partially successful, the fail counter is reset thus up
// to maxAttempts send attempts without any progress might be executed.
func (s *SingleConnectionMode) publish(
signaler outputs.Signaler,
opts outputs.Options,
send func() (ok bool, resetFail bool),
) error {
fails := 0
var backoffCount uint
var err error
guaranteed := opts.Guaranteed || s.maxAttempts == 0
for !s.closed && (guaranteed || fails < s.maxAttempts) {
ok := false
resetFail := false
if err := s.connect(); err != nil {
logp.Info("Connecting error publishing events (retrying): %s", err)
goto sendFail
}
ok, resetFail = send()
if !ok {
goto sendFail
}
debug("send completed")
outputs.SignalCompleted(signaler)
return nil
sendFail:
fails++
if resetFail {
debug("reset fails")
fails = 0
}
if !guaranteed && (s.maxAttempts > 0 && fails == s.maxAttempts) {
// max number of attempts reached
debug("max number of attempts reached")
break
}
logp.Info("send fail")
backoff := time.Duration(int64(s.waitRetry) * (1 << backoffCount))
if backoff > s.maxWaitRetry {
backoff = s.maxWaitRetry
} else {
backoffCount++
}
logp.Info("backoff retry: %v", backoff)
time.Sleep(backoff)
}
debug("messages dropped")
messagesDropped.Add(1)
outputs.SignalFailed(signaler, err)
return nil
}
func (m *LoadBalancerMode) onMessage(client ProtocolClient, msg eventsMessage) {
if msg.event != nil {
if err := client.PublishEvent(msg.event); err != nil {
msg.attemptsLeft--
m.onFail(msg, err)
return
}
} else {
events := msg.events
total := len(events)
var backoffCount uint
for len(events) > 0 {
var err error
events, err = client.PublishEvents(events)
if err != nil {
msg.attemptsLeft--
// reset attempt count if subset of messages has been processed
if len(events) < total {
msg.attemptsLeft = m.maxAttempts
}
if err != ErrTempBulkFailure {
// retry non-published subset of events in batch
msg.events = events
m.onFail(msg, err)
return
}
if m.maxAttempts > 0 && msg.attemptsLeft <= 0 {
// no more attempts left => drop
dropping(msg)
return
}
// wait before retry
backoff := time.Duration(int64(m.waitRetry) * (1 << backoffCount))
if backoff > m.maxWaitRetry {
backoff = m.maxWaitRetry
} else {
backoffCount++
}
select {
case <-m.done: // shutdown
outputs.SignalFailed(msg.signaler, err)
return
case <-time.After(backoff):
}
// reset total count for temporary failure loop
total = len(events)
}
}
}
outputs.SignalCompleted(msg.signaler)
}
func handlePublishEventsResult(
m *AsyncLoadBalancerMode,
msg eventsMessage,
) func([]common.MapStr, error) {
total := len(msg.events)
return func(events []common.MapStr, err error) {
debug("handlePublishEventsResult")
if err != nil {
debug("handle publish error: %v", err)
if msg.attemptsLeft > 0 {
msg.attemptsLeft--
}
// reset attempt count if subset of messages has been processed
if len(events) < total && msg.attemptsLeft >= 0 {
msg.attemptsLeft = m.maxAttempts
}
if err != ErrTempBulkFailure {
// retry non-published subset of events in batch
msg.events = events
m.onFail(false, msg, err)
return
}
if m.maxAttempts > 0 && msg.attemptsLeft == 0 {
// no more attempts left => drop
dropping(msg, &m.ws)
return
}
// retry non-published subset of events in batch
msg.events = events
m.onFail(false, msg, err)
return
}
// re-insert non-published events into pipeline
if len(events) != 0 {
debug("add non-published events back into pipeline: %v", len(events))
msg.events = events
if ok := m.forwardEvent(m.retries, msg); !ok {
dropping(msg, &m.ws)
}
return
}
// all events published -> signal success
debug("async bulk publish success")
outputs.SignalCompleted(msg.signaler)
m.ws.DoneEvent()
}
}
func handlePublishEventResult(m *AsyncLoadBalancerMode, msg eventsMessage) func(error) {
return func(err error) {
if err != nil {
if msg.attemptsLeft > 0 {
msg.attemptsLeft--
}
m.onFail(false, msg, err)
} else {
outputs.SignalCompleted(msg.signaler)
}
}
}
func (out *redisOutput) BulkPublish(
signal outputs.Signaler,
ts time.Time,
events []common.MapStr,
) error {
if !out.connected {
logp.Debug("output_redis", "Droping pkt ...")
return errors.New("Not connected")
}
command := "RPUSH"
if out.DataType == RedisChannelType {
command = "PUBLISH"
}
if len(events) == 1 { // single event
event := events[0]
jsonEvent, err := json.Marshal(event)
if err != nil {
logp.Err("Fail to convert the event to JSON: %s", err)
outputs.SignalCompleted(signal)
return err
}
_, err = out.Conn.Do(command, out.Index, string(jsonEvent))
outputs.Signal(signal, err)
out.onFail(err)
return err
}
for _, event := range events {
jsonEvent, err := json.Marshal(event)
if err != nil {
logp.Err("Fail to convert the event to JSON: %s", err)
continue
}
err = out.Conn.Send(command, out.Index, string(jsonEvent))
if err != nil {
outputs.SignalFailed(signal, err)
out.onFail(err)
return err
}
}
if err := out.Conn.Flush(); err != nil {
outputs.Signal(signal, err)
out.onFail(err)
return err
}
_, err := out.Conn.Receive()
outputs.Signal(signal, err)
out.onFail(err)
return err
}
// publish is used to publish events using the configured protocol client.
// It provides general error handling and back off support used on failed
// send attempts. To be used by PublishEvent and PublishEvents.
// The send callback will try to progress sending traffic and returns kind of
// progress made in ok or resetFail. If ok is set to true, send finished
// processing events. If ok is false but resetFail is set, send was partially
// successful. If send was partially successful, the fail counter is reset thus up
// to maxAttempts send attempts without any progress might be executed.
func (s *SingleConnectionMode) publish(
signaler outputs.Signaler,
opts outputs.Options,
send func() (ok bool, resetFail bool),
) error {
fails := 0
var err error
guaranteed := opts.Guaranteed || s.maxAttempts == 0
for !s.closed && (guaranteed || fails < s.maxAttempts) {
ok := false
resetFail := false
if err := s.connect(); err != nil {
logp.Info("Connecting error publishing events (retrying): %s", err)
goto sendFail
}
ok, resetFail = send()
if !ok {
goto sendFail
}
debug("send completed")
s.backoff.Reset()
outputs.SignalCompleted(signaler)
return nil
sendFail:
logp.Info("send fail")
s.backoff.Wait()
fails++
if resetFail {
debug("reset fails")
fails = 0
}
if !guaranteed && (s.maxAttempts > 0 && fails == s.maxAttempts) {
// max number of attempts reached
debug("max number of attempts reached")
break
}
}
debug("messages dropped")
messagesDropped.Add(1)
outputs.SignalFailed(signaler, err)
return nil
}
// publish is used to publish events using the configured protocol client.
// It provides general error handling and back off support used on failed
// send attempts. To be used by PublishEvent and PublishEvents.
// The send callback will try to progress sending traffic and returns kind of
// progress made in ok or resetFail. If ok is set to true, send finished
// processing events. If ok is false but resetFail is set, send was partially
// successful. If send was partially successful, the fail counter is reset thus up
// to maxAttempts send attempts without any progress might be executed.
func (f *FailOverConnectionMode) publish(
signaler outputs.Signaler,
opts outputs.Options,
send func() (ok bool, resetFail bool),
) error {
fails := 0
var err error
// TODO: we want back off support here? Fail over normally will try another
// connection.
guaranteed := opts.Guaranteed || f.maxAttempts == 0
for !f.closed && (guaranteed || fails < f.maxAttempts) {
ok := false
resetFail := false
if err = f.connect(f.active); err != nil {
logp.Info("Connecting error publishing events (retrying): %s", err)
goto sendFail
}
ok, resetFail = send()
if !ok {
goto sendFail
}
debug("send completed")
outputs.SignalCompleted(signaler)
return nil
sendFail:
fails++
if resetFail {
debug("reset fails")
fails = 0
}
if !guaranteed && (f.maxAttempts > 0 && fails == f.maxAttempts) {
// max number of attempts reached
debug("max number of attempts reached")
break
}
time.Sleep(f.waitRetry)
}
debug("messages dropped")
messagesDropped.Add(1)
outputs.SignalFailed(signaler, err)
return nil
}
func TestPublisherModes(t *testing.T) {
tests := []struct {
title string
async bool
order []int
}{
{"sync", false, []int{1, 2, 3, 4, 5, 6}},
{"async ordered signal", true, []int{1, 2, 3, 4, 5, 6}},
{"async out of order signal", true, []int{5, 2, 3, 1, 4, 6}},
}
for i, test := range tests {
t.Logf("run publisher test (%v): %v", i, test.title)
pubChan := make(chan []*input.FileEvent, len(test.order)+1)
regChan := make(chan []*input.FileEvent, len(test.order)+1)
client := publisher.ExtChanClient{make(chan publisher.PublishMessage)}
pub := newPublisher(test.async, pubChan, regChan, client)
pub.Start()
var events [][]*input.FileEvent
for i := range test.order {
tmp := makeEvents(fmt.Sprintf("msg: %v", i), 1)
pubChan <- tmp
events = append(events, tmp)
}
var msgs []publisher.PublishMessage
for _ = range test.order {
m := <-client.Channel
msgs = append(msgs, m)
}
for _, i := range test.order {
outputs.SignalCompleted(msgs[i-1].Context.Signal)
}
var regEvents [][]*input.FileEvent
for _ = range test.order {
regEvents = append(regEvents, <-regChan)
}
pub.Stop()
// validate order
for i := range events {
assert.Equal(t, events[i], regEvents[i])
}
}
}
func (p *syncPublisher) forward(m message) bool {
sync := outputs.NewSyncSignal()
signal := m.context.signal
m.context.signal = sync
p.send(m)
if sync.Wait() {
outputs.SignalCompleted(signal)
return true
}
if signal != nil {
signal.Failed()
}
return false
}
// publish is used to publish events using the configured protocol client.
// It provides general error handling and back off support used on failed
// send attempts. To be used by PublishEvent and PublishEvents.
// The send callback will try to progress sending traffic and returns kind of
// progress made in ok or resetFail. If ok is set to true, send finished
// processing events. If ok is false but resetFail is set, send was partially
// successful. If send was partially successful, the fail counter is reset thus up
// to maxAttempts send attempts without any progress might be executed.
func (s *SingleConnectionMode) publish(
signaler outputs.Signaler,
send func() (ok bool, resetFail bool),
) error {
fails := 0
var backoffCount uint
var err error
for !s.closed && (s.maxAttempts == 0 || fails < s.maxAttempts) {
ok := false
resetFail := false
if err := s.connect(); err != nil {
logp.Info("Connecting error publishing events (retrying): %s", err)
goto sendFail
}
ok, resetFail = send()
if !ok {
goto sendFail
}
outputs.SignalCompleted(signaler)
return nil
sendFail:
fails++
if resetFail {
fails = 0
}
if s.maxAttempts > 0 && fails == s.maxAttempts {
// max number of attempts reached
break
}
logp.Info("send fail")
backoff := time.Duration(int64(s.waitRetry) * (1 << backoffCount))
if backoff > s.maxWaitRetry {
backoff = s.maxWaitRetry
} else {
backoffCount++
}
logp.Info("backoff retry: %v", backoff)
time.Sleep(backoff)
}
outputs.SignalFailed(signaler, err)
return nil
}
func (p *asyncPublisher) send(m message) {
if p.pub.disabled {
debug("publisher disabled")
outputs.SignalCompleted(m.context.signal)
return
}
// m.signal is not set yet. But a async client type supporting signals might
// be implemented in the future.
// If m.signal is nil, NewSplitSignaler will return nil -> signaler will
// only set if client did send one
if m.context.signal != nil && len(p.outputs) > 1 {
m.context.signal = outputs.NewSplitSignaler(m.context.signal, len(p.outputs))
}
for _, o := range p.outputs {
o.send(m)
}
}
func (o *outputWorker) onEvent(ctx *context, event common.MapStr) {
debug("output worker: publish single event")
ts := time.Time(event["@timestamp"].(common.Time)).UTC()
if !ctx.sync {
_ = o.out.PublishEvent(ctx.signal, ts, event)
return
}
signal := outputs.NewSyncSignal()
for {
o.out.PublishEvent(signal, ts, event)
if signal.Wait() {
outputs.SignalCompleted(ctx.signal)
break
}
}
}
// publish is used to publish events using the configured protocol client.
// It provides general error handling and back off support used on failed
// send attempts. To be used by PublishEvent and PublishEvents.
// The send callback will try to progress sending traffic and returns kind of
// progress made in ok or resetFail. If ok is set to true, send finished
// processing events. If ok is false but resetFail is set, send was partially
// successful. If send was partially successful, the fail counter is reset thus up
// to maxAttempts send attempts without any progress might be executed.
func (f *FailOverConnectionMode) publish(
signaler outputs.Signaler,
send func() (ok bool, resetFail bool),
) error {
fails := 0
var err error
// TODO: we want back off support here? Fail over normally will try another
// connection.
for !f.closed && (f.maxAttempts == 0 || fails < f.maxAttempts) {
ok := false
resetFail := false
if err = f.connect(f.active); err != nil {
logp.Info("Connecting error publishing events (retrying): %s", err)
goto sendFail
}
ok, resetFail = send()
if !ok {
goto sendFail
}
outputs.SignalCompleted(signaler)
return nil
sendFail:
fails++
if resetFail {
fails = 0
}
if f.maxAttempts > 0 && fails == f.maxAttempts {
// max number of attempts reached
break
}
time.Sleep(f.waitRetry)
}
outputs.SignalFailed(signaler, err)
return nil
}
func (c *cmp) PublishEvent(
s outputs.Signaler,
opts outputs.Options,
event common.MapStr,
) error {
var err error
if err = postToCmp(c, event); err != nil {
goto fail
}
outputs.SignalCompleted(s)
return nil
fail:
if opts.Guaranteed {
logp.Critical("Unable to publish events to cmp: %v", err)
}
outputs.SignalFailed(s, err)
return err
}
func (o *outputWorker) sendBulk(
sync *outputs.SyncSignal,
ctx *context,
events []common.MapStr,
) {
debug("output worker: publish %v events", len(events))
ts := time.Time(events[0]["@timestamp"].(common.Time)).UTC()
if sync == nil {
err := o.out.BulkPublish(ctx.signal, ts, events)
if err != nil {
logp.Info("Error bulk publishing events: %s", err)
}
return
}
for done := false; !done; done = sync.Wait() {
o.out.BulkPublish(sync, ts, events)
}
outputs.SignalCompleted(ctx.signal)
}
func (out *redisOutput) BulkPublish(
signal outputs.Signaler,
opts outputs.Options,
events []common.MapStr,
) error {
if !opts.Guaranteed {
err := out.doBulkPublish(events)
outputs.Signal(signal, err)
return err
}
for {
err := out.doBulkPublish(events)
if err == nil {
outputs.SignalCompleted(signal)
return nil
}
// TODO: add backoff
time.Sleep(1)
}
}
func (out *fileOutput) PublishEvent(
trans outputs.Signaler,
ts time.Time,
event common.MapStr,
) error {
jsonEvent, err := json.Marshal(event)
if err != nil {
// mark as success so event is not sent again.
outputs.SignalCompleted(trans)
logp.Err("Fail to convert the event to JSON: %s", err)
return err
}
err = out.rotator.WriteLine(jsonEvent)
if err != nil {
logp.Err("Error when writing line to file: %s", err)
}
outputs.Signal(trans, err)
return err
}
func (m *LoadBalancerMode) onMessage(
backoff *backoff,
client ProtocolClient,
msg eventsMessage,
) (bool, error) {
done := false
if msg.event != nil {
err := client.PublishEvent(msg.event)
done = !backoff.WaitOnError(err)
if err != nil {
if msg.attemptsLeft > 0 {
msg.attemptsLeft--
}
m.onFail(msg, err)
return done, err
}
} else {
events := msg.events
total := len(events)
for len(events) > 0 {
var err error
events, err = client.PublishEvents(events)
done = !backoff.WaitOnError(err)
if done && err != nil {
outputs.SignalFailed(msg.signaler, err)
return done, err
}
if err != nil {
if msg.attemptsLeft > 0 {
msg.attemptsLeft--
}
// reset attempt count if subset of messages has been processed
if len(events) < total && msg.attemptsLeft >= 0 {
debug("reset fails")
msg.attemptsLeft = m.maxAttempts
}
if err != ErrTempBulkFailure {
// retry non-published subset of events in batch
msg.events = events
m.onFail(msg, err)
return done, err
}
if m.maxAttempts > 0 && msg.attemptsLeft == 0 {
// no more attempts left => drop
dropping(msg)
return done, err
}
// reset total count for temporary failure loop
total = len(events)
}
}
}
outputs.SignalCompleted(msg.signaler)
return done, nil
}
func (p *preprocessor) onMessage(m message) {
publisher := p.pub
single := false
events := m.events
if m.event != nil {
single = true
events = []common.MapStr{m.event}
}
var ignore []int // indices of events to be removed from events
debug("Start Preprocessing")
for i, event := range events {
// validate some required field
if err := filterEvent(event); err != nil {
logp.Err("Publishing event failed: %v", err)
ignore = append(ignore, i)
continue
}
// update address and geo-ip information. Ignore event
// if address is invalid or event is found to be a duplicate
ok := updateEventAddresses(publisher, event)
if !ok {
ignore = append(ignore, i)
continue
}
// add additional Beat meta data
event["beat"] = common.MapStr{
"name": publisher.name,
"hostname": publisher.hostname,
}
if len(publisher.tags) > 0 {
event["tags"] = publisher.tags
}
if logp.IsDebug("publish") {
PrintPublishEvent(event)
}
}
// return if no event is left
if len(ignore) == len(events) {
debug("no event left, complete send")
outputs.SignalCompleted(m.context.signal)
return
}
// remove invalid events.
// TODO: is order important? Removal can be turned into O(len(ignore)) by
// copying last element into idx and doing
// events=events[:len(events)-len(ignore)] afterwards
// Alternatively filtering could be implemented like:
// https://github.com/golang/go/wiki/SliceTricks#filtering-without-allocating
for i := len(ignore) - 1; i >= 0; i-- {
idx := ignore[i]
debug("remove event[%v]", idx)
events = append(events[:idx], events[idx+1:]...)
}
if publisher.disabled {
debug("publisher disabled")
outputs.SignalCompleted(m.context.signal)
return
}
debug("Forward preprocessed events")
if single {
p.handler.onMessage(message{context: m.context, event: events[0]})
} else {
p.handler.onMessage(message{context: m.context, events: events})
}
}
// PublishEvent writes events to a channel then calls Completed on trans.
// It always returns nil.
func (t *testOutputer) PublishEvent(trans outputs.Signaler, ts time.Time,
event common.MapStr) error {
t.events <- event
outputs.SignalCompleted(trans)
return nil
}