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event.go
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event.go
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package avro
import (
"reflect"
"time"
"github.com/ln80/event-store/event"
"github.com/ln80/event-store/internal/logger"
)
var (
noEvent = struct{}{}
)
func convertEvent(evt event.Envelope) (to *avroEvent, err error) {
to, ok := evt.(*avroEvent)
if ok {
return
}
to = &avroEvent{
FStreamID: evt.StreamID(),
FID: evt.ID(),
FType: evt.Type(),
FRawEvent: evt.Event(),
FAt: evt.At().UnixNano(),
FUser: evt.User(),
FDests: evt.Dests(),
FTTL: evt.TTL(),
fVersion: evt.Version(),
fGlobalVersion: evt.GlobalVersion(),
}
if !evt.Version().Equal(event.VersionZero) {
to.FRawVersion = to.fVersion.String()
}
if !evt.GlobalVersion().Equal(event.VersionZero) {
to.FRawGlobalVersion = to.fGlobalVersion.String()
}
return
}
type avroEvent struct {
FStreamID string `avro:"StmID"`
fGlobalStreamID string
FRawGlobalVersion string `avro:"GVer"`
fGlobalVersion event.Version
FRawVersion string `avro:"Ver"`
fVersion event.Version
FID string `avro:"ID"`
FType string `avro:"Type"`
fEvent any
FAt int64 `avro:"At"`
FUser string `avro:"User"`
FDests []string `avro:"Dests"`
FTTL time.Duration `avro:"TTL"`
// make sure to put data as last field for future partial decoding (using a sub-schema)
FRawEvent any `avro:"Data" ev:",inject=union"`
// schemaID used by avro registries to allow re-encoding the event using the same schema.
avroSchemaID string
}
var _ event.Envelope = &avroEvent{}
func (e *avroEvent) Event() any {
if e.fEvent != nil {
if e.fEvent == noEvent {
return nil
}
return e.fEvent
}
if e.FRawEvent != nil {
e.fEvent = e.FRawEvent
return e.fEvent
}
log := logger.Default().
WithName("avro").
WithValues(
"stmID", e.StreamID(),
"type", e.Type(),
"ver", e.Version(),
)
log.V(1).Info("Unexpected empty event data")
log.V(3).Info("Perhaps event type is no longer part of any registered Avro schemas", "schemaID", e.avroSchemaID)
e.fEvent = noEvent
return nil
}
func (e *avroEvent) StreamID() string {
return e.FStreamID
}
func (e *avroEvent) ID() string {
return e.FID
}
func (e *avroEvent) Type() string {
return e.FType
}
func (e *avroEvent) At() time.Time {
return time.Unix(0, e.FAt)
}
func (e *avroEvent) Version() event.Version {
if !e.fVersion.IsZero() {
return e.fVersion
}
if e.FRawVersion != "" {
e.fVersion, _ = event.Ver(e.FRawVersion)
}
return e.fVersion
}
func (e *avroEvent) User() string {
return e.FUser
}
func (e *avroEvent) GlobalStreamID() string {
if e.fGlobalStreamID == "" {
stmID, _ := event.ParseStreamID(e.FStreamID)
e.fGlobalStreamID = stmID.GlobalID()
}
return e.fGlobalStreamID
}
func (e *avroEvent) GlobalVersion() event.Version {
if !e.fGlobalVersion.IsZero() {
return e.fGlobalVersion
}
if e.FRawGlobalVersion != "" {
e.fGlobalVersion, _ = event.Ver(e.FRawGlobalVersion)
}
return e.fGlobalVersion
}
func (e *avroEvent) Dests() []string {
return e.FDests
}
func (e *avroEvent) TTL() time.Duration {
return e.FTTL
}
func (e *avroEvent) SetGlobalVersion(v event.Version) event.Envelope {
e.fGlobalVersion = v
e.FRawGlobalVersion = e.fGlobalVersion.String()
return e
}
var _ event.Transformer = &avroEvent{}
func (e *avroEvent) Transform(fn func(any) any) {
if e.Event() != nil {
e.fEvent = fn(e.fEvent)
}
}
func (e *avroEvent) SetAVROSchemaID(id string) {
e.avroSchemaID = id
}
func (e *avroEvent) AVROSchemaID() string {
return e.avroSchemaID
}
// checkType does change event type name in the envelope to match
// the current event data struct type.
func (e *avroEvent) checkType(namespace string) {
// make sure to require namespace; this logic might change because
// using global event registry might be error-prone.
if namespace == "" {
return
}
// event data might be empty in the case of a removed event type
// that is not indicated as alias for a new.
//
// In a such case just do skip type name upgrade.
data := e.Event()
if data == nil {
return
}
// In the case fo an empty event registry. Avro serializer use generic type i.e, a Map to represent data.
// In such as case, do skip event type name upgrade.
typ := reflect.TypeOf(data)
if typ.Kind() == reflect.Pointer {
typ = typ.Elem()
}
if typ.Kind() != reflect.Struct {
return
}
t := event.TypeOfWithNamespace(namespace, data)
if t != e.FType {
logger.Default().WithName("avro").V(1).Info("Event type name has been upgraded",
"stmID", e.StreamID(),
"old_type", e.FType,
"type", t,
"ver", e.Version())
e.FType = t
}
}