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event.go
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event.go
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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package otlp
import (
"github.com/apache/arrow/go/v12/arrow"
"go.opentelemetry.io/collector/pdata/pcommon"
"go.opentelemetry.io/collector/pdata/ptrace"
arrowutils "github.com/f5/otel-arrow-adapter/pkg/arrow"
carrow "github.com/f5/otel-arrow-adapter/pkg/otel/common/arrow"
"github.com/f5/otel-arrow-adapter/pkg/otel/common/otlp"
"github.com/f5/otel-arrow-adapter/pkg/otel/constants"
tarrow "github.com/f5/otel-arrow-adapter/pkg/otel/traces/arrow"
"github.com/f5/otel-arrow-adapter/pkg/werror"
)
type (
// SpanEventIDs is a struct containing the Arrow field IDs for the Event
// struct.
SpanEventIDs struct {
ParentID int // Span ID
TimeUnixNano int
Name int
ID int // Event ID (used by attributes of the event)
DroppedAttributesCount int
}
// SpanEventsStore contains a set of events indexed by span ID.
// This store is initialized from an arrow.Record representing all the
// events for a batch of spans.
SpanEventsStore struct {
nextID uint16
eventsByID map[uint16][]*ptrace.SpanEvent
config *tarrow.EventConfig
}
EventParentIdDecoder struct {
prevParentID uint16
prevName string
encodingType int
}
)
// NewSpanEventsStore creates a new SpanEventsStore.
func NewSpanEventsStore(config *tarrow.EventConfig) *SpanEventsStore {
return &SpanEventsStore{
eventsByID: make(map[uint16][]*ptrace.SpanEvent),
config: config,
}
}
// EventsByID returns the events for the given span ID.
func (s *SpanEventsStore) EventsByID(ID uint16) []*ptrace.SpanEvent {
if events, ok := s.eventsByID[ID]; ok {
return events
}
return nil
}
// SpanEventsStoreFrom creates an SpanEventsStore from an arrow.Record.
// Note: This function consume the record.
func SpanEventsStoreFrom(
record arrow.Record,
attrsStore *otlp.Attributes32Store,
conf *tarrow.EventConfig,
) (*SpanEventsStore, error) {
defer record.Release()
store := &SpanEventsStore{
eventsByID: make(map[uint16][]*ptrace.SpanEvent),
}
// ToDo Make this decoding dependent on the encoding type column metadata.
parentIdDecoder := NewEventParentIdDecoder(carrow.ParentIdDeltaGroupEncoding)
spanEventIDs, err := SchemaToSpanEventIDs(record.Schema())
if err != nil {
return nil, werror.Wrap(err)
}
eventsCount := int(record.NumRows())
// Read all event fields from the record and reconstruct the event lists
// by ID.
for row := 0; row < eventsCount; row++ {
ID, err := arrowutils.NullableU32FromRecord(record, spanEventIDs.ID, row)
if err != nil {
return nil, werror.Wrap(err)
}
name, err := arrowutils.StringFromRecord(record, spanEventIDs.Name, row)
if err != nil {
return nil, werror.Wrap(err)
}
parentID, err := arrowutils.U16FromRecord(record, spanEventIDs.ParentID, row)
if err != nil {
return nil, werror.Wrap(err)
}
parentID = parentIdDecoder.Decode(parentID, name)
timeUnixNano, err := arrowutils.TimestampFromRecord(record, spanEventIDs.TimeUnixNano, row)
if err != nil {
return nil, werror.Wrap(err)
}
dac, err := arrowutils.U32FromRecord(record, spanEventIDs.DroppedAttributesCount, row)
if err != nil {
return nil, werror.Wrap(err)
}
event := ptrace.NewSpanEvent()
event.SetTimestamp(pcommon.Timestamp(timeUnixNano))
event.SetName(name)
if ID != nil {
attrs := attrsStore.AttributesByDeltaID(*ID)
if attrs != nil {
attrs.CopyTo(event.Attributes())
}
}
event.SetDroppedAttributesCount(dac)
store.eventsByID[parentID] = append(store.eventsByID[parentID], &event)
}
return store, nil
}
// SchemaToSpanEventIDs pre-computes the field IDs for the events record.
func SchemaToSpanEventIDs(schema *arrow.Schema) (*SpanEventIDs, error) {
ID, err := arrowutils.FieldIDFromSchema(schema, constants.ID)
if err != nil {
return nil, werror.Wrap(err)
}
ParentID, err := arrowutils.FieldIDFromSchema(schema, constants.ParentID)
if err != nil {
return nil, werror.Wrap(err)
}
timeUnixNano, err := arrowutils.FieldIDFromSchema(schema, constants.TimeUnixNano)
if err != nil {
return nil, werror.Wrap(err)
}
name, err := arrowutils.FieldIDFromSchema(schema, constants.Name)
if err != nil {
return nil, werror.Wrap(err)
}
dac, err := arrowutils.FieldIDFromSchema(schema, constants.DroppedAttributesCount)
if err != nil {
return nil, werror.Wrap(err)
}
return &SpanEventIDs{
ID: ID,
ParentID: ParentID,
TimeUnixNano: timeUnixNano,
Name: name,
DroppedAttributesCount: dac,
}, nil
}
func NewEventParentIdDecoder(encodingType int) *EventParentIdDecoder {
return &EventParentIdDecoder{
prevParentID: 0,
prevName: "",
encodingType: encodingType,
}
}
func (d *EventParentIdDecoder) Decode(value uint16, name string) uint16 {
switch d.encodingType {
case carrow.ParentIdNoEncoding:
return value
case carrow.ParentIdDeltaEncoding:
decodedParentID := d.prevParentID + value
d.prevParentID = decodedParentID
return decodedParentID
case carrow.ParentIdDeltaGroupEncoding:
if d.prevName == name {
parentID := d.prevParentID + value
d.prevParentID = parentID
return parentID
} else {
d.prevName = name
d.prevParentID = value
return value
}
default:
panic("unknown event parent ID encoding type")
}
}