Generalize the event store using go generics (#16910)

internal/event/target/mysql.go

@@ -33,6 +33,7 @@ import (
 	"github.com/go-sql-driver/mysql"
 	"github.com/minio/minio/internal/event"
 	"github.com/minio/minio/internal/logger"
+	"github.com/minio/minio/internal/store"
 	xnet "github.com/minio/pkg/net"
 )
 
@@ -153,7 +154,7 @@ type MySQLTarget struct {
 	deleteStmt *sql.Stmt
 	insertStmt *sql.Stmt
 	db         *sql.DB
-	store      Store
+	store      store.Store[event.Event]
 	firstPing  bool
 	loggerOnce logger.LogOnce
 
@@ -165,6 +166,11 @@ func (target *MySQLTarget) ID() event.TargetID {
 	return target.id
 }
 
+// Name - returns the Name of the target.
+func (target *MySQLTarget) Name() string {
+	return target.ID().String()
+}
+
 // Store returns any underlying store if set.
 func (target *MySQLTarget) Store() event.TargetStore {
 	return target.store
@@ -181,7 +187,7 @@ func (target *MySQLTarget) IsActive() (bool, error) {
 func (target *MySQLTarget) isActive() (bool, error) {
 	if err := target.db.Ping(); err != nil {
 		if IsConnErr(err) {
-			return false, errNotConnected
+			return false, store.ErrNotConnected
 		}
 		return false, err
 	}
@@ -260,7 +266,7 @@ func (target *MySQLTarget) Send(eventKey string) error {
 	if !target.firstPing {
 		if err := target.executeStmts(); err != nil {
 			if IsConnErr(err) {
-				return errNotConnected
+				return store.ErrNotConnected
 			}
 			return err
 		}
@@ -278,7 +284,7 @@ func (target *MySQLTarget) Send(eventKey string) error {
 
 	if err := target.send(eventData); err != nil {
 		if IsConnErr(err) {
-			return errNotConnected
+			return store.ErrNotConnected
 		}
 		return err
 	}
@@ -363,7 +369,7 @@ func (target *MySQLTarget) initMySQL() error {
 
 	err = target.db.Ping()
 	if err != nil {
-		if !(IsConnRefusedErr(err) || IsConnResetErr(err)) {
+		if !(xnet.IsConnRefusedErr(err) || xnet.IsConnResetErr(err)) {
 			target.loggerOnce(context.Background(), err, target.ID().String())
 		}
 	} else {
@@ -384,7 +390,7 @@ func (target *MySQLTarget) initMySQL() error {
 		return err
 	}
 	if !yes {
-		return errNotConnected
+		return store.ErrNotConnected
 	}
 
 	return nil
@@ -392,11 +398,11 @@ func (target *MySQLTarget) initMySQL() error {
 
 // NewMySQLTarget - creates new MySQL target.
 func NewMySQLTarget(id string, args MySQLArgs, loggerOnce logger.LogOnce) (*MySQLTarget, error) {
-	var store Store
+	var queueStore store.Store[event.Event]
 	if args.QueueDir != "" {
 		queueDir := filepath.Join(args.QueueDir, storePrefix+"-mysql-"+id)
-		store = NewQueueStore(queueDir, args.QueueLimit)
-		if err := store.Open(); err != nil {
+		queueStore = store.NewQueueStore[event.Event](queueDir, args.QueueLimit, event.StoreExtension)
+		if err := queueStore.Open(); err != nil {
 			return nil, fmt.Errorf("unable to initialize the queue store of MySQL `%s`: %w", id, err)
 		}
 	}
@@ -419,13 +425,13 @@ func NewMySQLTarget(id string, args MySQLArgs, loggerOnce logger.LogOnce) (*MySQ
 		id:         event.TargetID{ID: id, Name: "mysql"},
 		args:       args,
 		firstPing:  false,
-		store:      store,
+		store:      queueStore,
 		loggerOnce: loggerOnce,
 		quitCh:     make(chan struct{}),
 	}
 
 	if target.store != nil {
-		streamEventsFromStore(target.store, target, target.quitCh, target.loggerOnce)
+		store.StreamItems(target.store, target, target.quitCh, target.loggerOnce)
 	}
 
 	return target, nil