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otelconsumer: adjustments to collector logic and retry/ack unit tests (…
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…#41457)

The call to `ConsumeLogs` can fail in various ways. If the error is of
type "Permanent", retrying will have no effect. For any other error,
we need to retry the batch. Additionally, only acknowledge a batch
when the collector confirms receipt of the data to avoid losing events.
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mauri870 authored Oct 29, 2024
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212 changes: 212 additions & 0 deletions NOTICE.txt
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Expand Up @@ -55740,6 +55740,218 @@ Contents of probable licence file $GOMODCACHE/go.opentelemetry.io/collector/pdat
limitations under the License.


--------------------------------------------------------------------------------
Dependency : go.opentelemetry.io/collector/pdata/testdata
Version: v0.109.0
Licence type (autodetected): Apache-2.0
--------------------------------------------------------------------------------

Contents of probable licence file $GOMODCACHE/go.opentelemetry.io/collector/pdata/testdata@v0.109.0/LICENSE:


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--------------------------------------------------------------------------------
Dependency : go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc
Version: v0.49.0
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2 changes: 2 additions & 0 deletions go.sum
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Expand Up @@ -953,6 +953,8 @@ go.opentelemetry.io/collector/pdata v1.15.0 h1:q/T1sFpRKJnjDrUsHdJ6mq4uSqViR/f92
go.opentelemetry.io/collector/pdata v1.15.0/go.mod h1:2wcsTIiLAJSbqBq/XUUYbi+cP+N87d0jEJzmb9nT19U=
go.opentelemetry.io/collector/pdata/pprofile v0.109.0 h1:5lobQKeHk8p4WC7KYbzL6ZqqX3eSizsdmp5vM8pQFBs=
go.opentelemetry.io/collector/pdata/pprofile v0.109.0/go.mod h1:lXIifCdtR5ewO17JAYTUsclMqRp6h6dCowoXHhGyw8Y=
go.opentelemetry.io/collector/pdata/testdata v0.109.0 h1:gvIqy6juvqFET/6zi+zUOH1KZY/vtEDZW55u7gJ/hEo=
go.opentelemetry.io/collector/pdata/testdata v0.109.0/go.mod h1:zRttU/F5QMQ6ZXBMXCoSVG3EORTZLTK+UUS0VoMoT44=
go.opentelemetry.io/collector/receiver v0.109.0 h1:DTOM7xaDl7FUGQIjvjmWZn03JUE+aG4mJzWWfb7S8zw=
go.opentelemetry.io/collector/receiver v0.109.0/go.mod h1:jeiCHaf3PE6aXoZfHF5Uexg7aztu+Vkn9LVw0YDKm6g=
go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.49.0 h1:4Pp6oUg3+e/6M4C0A/3kJ2VYa++dsWVTtGgLVj5xtHg=
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26 changes: 21 additions & 5 deletions libbeat/outputs/otelconsumer/otelconsumer.go
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Expand Up @@ -29,6 +29,7 @@ import (
"github.com/elastic/elastic-agent-libs/mapstr"

"go.opentelemetry.io/collector/consumer"
"go.opentelemetry.io/collector/consumer/consumererror"
"go.opentelemetry.io/collector/pdata/pcommon"
"go.opentelemetry.io/collector/pdata/plog"
)
Expand Down Expand Up @@ -63,7 +64,7 @@ func (out *otelConsumer) Close() error {
return nil
}

// Publish converts Beat events to Otel format and send to the next otel consumer
// Publish converts Beat events to Otel format and sends them to the Otel collector
func (out *otelConsumer) Publish(ctx context.Context, batch publisher.Batch) error {
switch {
case out.logsConsumer != nil:
Expand All @@ -73,8 +74,7 @@ func (out *otelConsumer) Publish(ctx context.Context, batch publisher.Batch) err
}
}

func (out *otelConsumer) logsPublish(_ context.Context, batch publisher.Batch) error {
defer batch.ACK()
func (out *otelConsumer) logsPublish(ctx context.Context, batch publisher.Batch) error {
st := out.observer
pLogs := plog.NewLogs()
resourceLogs := pLogs.ResourceLogs().AppendEmpty()
Expand All @@ -97,10 +97,26 @@ func (out *otelConsumer) logsPublish(_ context.Context, batch publisher.Batch) e
pcommonEvent.CopyTo(logRecord.Body().SetEmptyMap())
}

if err := out.logsConsumer.ConsumeLogs(context.TODO(), pLogs); err != nil {
return fmt.Errorf("error otel log consumer: %w", err)
err := out.logsConsumer.ConsumeLogs(ctx, pLogs)
if err != nil {
// Permanent errors shouldn't be retried. This tipically means
// the data cannot be serialized by the exporter that is attached
// to the pipeline or when the destination refuses the data because
// it cannot decode it. Retrying in this case is useless.
//
// See https://github.com/open-telemetry/opentelemetry-collector/blob/1c47d89/receiver/doc.go#L23-L40
if consumererror.IsPermanent(err) {
st.PermanentErrors(len(events))
batch.Drop()
} else {
st.RetryableErrors(len(events))
batch.Retry()
}

return fmt.Errorf("failed to send batch events to otel collector: %w", err)
}

batch.ACK()
st.NewBatch(len(events))
st.AckedEvents(len(events))
return nil
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88 changes: 88 additions & 0 deletions libbeat/outputs/otelconsumer/otelconsumer_test.go
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Expand Up @@ -18,15 +18,103 @@
package otelconsumer

import (
"context"
"errors"
"testing"
"time"

"github.com/stretchr/testify/assert"
"go.opentelemetry.io/collector/consumer"
"go.opentelemetry.io/collector/consumer/consumererror"
"go.opentelemetry.io/collector/pdata/pcommon"
"go.opentelemetry.io/collector/pdata/plog"

"github.com/elastic/beats/v7/libbeat/beat"
"github.com/elastic/beats/v7/libbeat/outputs"
"github.com/elastic/beats/v7/libbeat/outputs/outest"
"github.com/elastic/elastic-agent-libs/mapstr"
)

func TestPublish(t *testing.T) {
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()

event1 := beat.Event{Fields: mapstr.M{"field": 1}}
event2 := beat.Event{Fields: mapstr.M{"field": 2}}
event3 := beat.Event{Fields: mapstr.M{"field": 3}}

makeOtelConsumer := func(t *testing.T, consumeFn func(ctx context.Context, ld plog.Logs) error) *otelConsumer {
t.Helper()

logConsumer, err := consumer.NewLogs(consumeFn)
assert.NoError(t, err)
consumer := &otelConsumer{
observer: outputs.NewNilObserver(),
logsConsumer: logConsumer,
beatInfo: beat.Info{},
}
return consumer
}

t.Run("ack batch on consumer success", func(t *testing.T) {
batch := outest.NewBatch(event1, event2, event3)

var countLogs int
otelConsumer := makeOtelConsumer(t, func(ctx context.Context, ld plog.Logs) error {
countLogs = countLogs + ld.LogRecordCount()
return nil
})

err := otelConsumer.Publish(ctx, batch)
assert.NoError(t, err)
assert.Len(t, batch.Signals, 1)
assert.Equal(t, outest.BatchACK, batch.Signals[0].Tag)
assert.Equal(t, len(batch.Events()), countLogs, "all events should be consumed")
})

t.Run("retries the batch on non-permanent consumer error", func(t *testing.T) {
batch := outest.NewBatch(event1, event2, event3)

otelConsumer := makeOtelConsumer(t, func(ctx context.Context, ld plog.Logs) error {
return errors.New("consume error")
})

err := otelConsumer.Publish(ctx, batch)
assert.Error(t, err)
assert.False(t, consumererror.IsPermanent(err))
assert.Len(t, batch.Signals, 1)
assert.Equal(t, outest.BatchRetry, batch.Signals[0].Tag)
})

t.Run("drop batch on permanent consumer error", func(t *testing.T) {
batch := outest.NewBatch(event1, event2, event3)

otelConsumer := makeOtelConsumer(t, func(ctx context.Context, ld plog.Logs) error {
return consumererror.NewPermanent(errors.New("consumer error"))
})

err := otelConsumer.Publish(ctx, batch)
assert.Error(t, err)
assert.True(t, consumererror.IsPermanent(err))
assert.Len(t, batch.Signals, 1)
assert.Equal(t, outest.BatchDrop, batch.Signals[0].Tag)
})

t.Run("retries on context cancelled", func(t *testing.T) {
batch := outest.NewBatch(event1, event2, event3)

otelConsumer := makeOtelConsumer(t, func(ctx context.Context, ld plog.Logs) error {
return context.Canceled
})

err := otelConsumer.Publish(ctx, batch)
assert.Error(t, err)
assert.ErrorIs(t, err, context.Canceled)
assert.Len(t, batch.Signals, 1)
assert.Equal(t, outest.BatchRetry, batch.Signals[0].Tag)
})
}

func TestMapstrToPcommonMapString(t *testing.T) {
tests := map[string]struct {
mapstr_val interface{}
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