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eventstream.go
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eventstream.go
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package database
import (
"database/sql"
"encoding/json"
"errors"
"github.com/google/uuid"
"github.com/mbict/go-cqrs/v4"
"time"
)
var (
ErrNoEventData = errors.New("Cannot scan, no event data")
)
type EventStream struct {
rows *sql.Rows
err error
version int
aggregateId cqrs.AggregateId
eventType cqrs.EventType
data sql.RawBytes
timestamp time.Time
}
func NewDatabaseEventStream(rows *sql.Rows) cqrs.EventStream {
return &EventStream{
rows: rows,
}
}
func (s *EventStream) AggregateId() cqrs.AggregateId {
return s.aggregateId
}
func (s *EventStream) EventType() cqrs.EventType {
return s.eventType
}
func (s *EventStream) Version() int {
return s.version
}
func (s *EventStream) Timestamp() time.Time {
return s.timestamp
}
func (s *EventStream) Next() bool {
if s.rows.Next() {
if s.err = s.rows.Scan(&s.aggregateId, &s.eventType, &s.data, &s.version, &s.timestamp); s.err != nil {
return false
}
return true
}
if s.err == nil {
s.err = s.rows.Err()
}
s.aggregateId = uuid.Nil
s.eventType = ""
s.version = -1
s.data = nil
return false
}
func (s *EventStream) Error() error {
return s.err
}
func (s *EventStream) Scan(event cqrs.EventData) error {
if s.version == -1 || s.data == nil {
return ErrNoEventData
}
return json.Unmarshal(s.data, &event)
}