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snapshotstore.go
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snapshotstore.go
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package database
import (
"database/sql"
"encoding/json"
"github.com/mbict/go-cqrs/v4"
"log"
"time"
)
type snapshotStore struct {
db *sql.DB
deleteStmt *sql.Stmt
insertStmt *sql.Stmt
selectStmt *sql.Stmt
}
func (s *snapshotStore) Load(aggregateId cqrs.AggregateId, aggregate cqrs.Aggregate) (int, error) {
row := s.selectStmt.QueryRow(aggregateId, aggregate.AggregateName())
var jsonData []byte
var snapshotVersion int
err := row.Scan(&jsonData, &snapshotVersion)
if err == sql.ErrNoRows {
return 0, nil
} else if err != nil {
return 0, err
}
return snapshotVersion, json.Unmarshal(jsonData, aggregate)
}
func (s *snapshotStore) Write(aggregate cqrs.Aggregate) error {
payload, err := json.Marshal(aggregate)
if err != nil {
return err
}
tx, err := s.db.Begin()
if err != nil {
return nil
}
defer tx.Rollback()
_, err = tx.Stmt(s.deleteStmt).Exec(aggregate.AggregateId(), aggregate.AggregateName(), aggregate.Version())
if err != nil {
return err
}
result, err := tx.Stmt(s.insertStmt).Exec(aggregate.AggregateId(), aggregate.AggregateName(), payload, aggregate.Version(), time.Now())
if err != nil {
return err
}
if _, err := result.RowsAffected(); err != nil {
return err
}
tx.Commit()
return nil
}
func NewPostgresSnapshotStore(db *sql.DB) cqrs.SnapshotStore {
deleteStmt, err := db.Prepare("DELETE FROM snapshots WHERE aggregate_id = $1 AND aggregate_type = $2 AND version <> $3")
if err != nil {
log.Fatal(err)
}
insertStmt, err := db.Prepare("INSERT INTO snapshots (aggregate_id, aggregate_type, data, version, created) VALUES ($1, $2, $3, $4, $5)")
if err != nil {
log.Fatal(err)
}
selectStmt, err := db.Prepare("SELECT data, version FROM snapshots WHERE aggregate_id = $1 AND aggregate_type = $2 ORDER BY version DESC LIMIT 1")
if err != nil {
log.Fatal(err)
}
return &snapshotStore{
db: db,
deleteStmt: deleteStmt,
insertStmt: insertStmt,
selectStmt: selectStmt,
}
}
func NewMySQLSnapshotStore(db *sql.DB) cqrs.SnapshotStore {
deleteStmt, err := db.Prepare("DELETE FROM snapshots WHERE aggregate_id = ? AND aggregate_type = ? AND version <> ?")
if err != nil {
log.Fatal(err)
}
insertStmt, err := db.Prepare("INSERT INTO snapshots (aggregate_id, aggregate_type, data, version, created) VALUES (?, ?, ?, ?, ?)")
if err != nil {
log.Fatal(err)
}
selectStmt, err := db.Prepare("SELECT data, version FROM snapshots WHERE aggregate_id = ? AND aggregate_type = ? ORDER BY version DESC LIMIT 1")
if err != nil {
log.Fatal(err)
}
return &snapshotStore{
db: db,
deleteStmt: deleteStmt,
insertStmt: insertStmt,
selectStmt: selectStmt,
}
}