Merge pull request 'use generated interface' (#76) from generator into master

Reviewed-on: #76

common.go

@@ -6,6 +6,8 @@ import (
 	"fmt"
 )
 
+//go:generate sh -c "go run gen.go > wrap_gen.go"
+
 // namedValueToValue converts driver arguments of NamedValue format to Value format. Implemented in the same way as in
 // database/sql ctxutil.go.
 func namedValueToValue(named []driver.NamedValue) ([]driver.Value, error) {

conn.go

@@ -6,10 +6,23 @@ import (
 	"fmt"
 	"time"
 
-	"go.unistack.org/micro/v3/tracer"
+	"go.unistack.org/micro/v4/tracer"
 )
 
-var _ driver.Conn = &wrapperConn{}
+var (
+	_ driver.Conn               = (*wrapperConn)(nil)
+	_ driver.ConnBeginTx        = (*wrapperConn)(nil)
+	_ driver.ConnPrepareContext = (*wrapperConn)(nil)
+	_ driver.Pinger             = (*wrapperConn)(nil)
+	_ driver.Validator          = (*wrapperConn)(nil)
+	_ driver.Queryer            = (*wrapperConn)(nil)
+	_ driver.QueryerContext     = (*wrapperConn)(nil)
+	_ driver.Execer             = (*wrapperConn)(nil)
+	_ driver.ExecerContext      = (*wrapperConn)(nil)
+	//	_ driver.Connector
+	//	_ driver.Driver
+	//	_ driver.DriverContext
+)
 
 // wrapperConn defines a wrapper for driver.Conn
 type wrapperConn struct {
@@ -18,41 +31,7 @@ type wrapperConn struct {
 	conn  driver.Conn
 	opts  Options
 	ctx   context.Context
-}
-
-// Prepare implements driver.Conn Prepare
-func (w *wrapperConn) Prepare(query string) (driver.Stmt, error) {
-	var ctx context.Context
-	if w.ctx != nil {
-		ctx = w.ctx
-	} else {
-		ctx = context.Background()
-	}
-
-	labels := []string{labelMethod, "Prepare", labelQuery, labelUnknown}
-	ts := time.Now()
-	stmt, err := w.conn.Prepare(query)
-	td := time.Since(ts)
-	te := td.Seconds()
-	if err != nil {
-		w.opts.Meter.Counter(meterRequestTotal, append(labels, labelStatus, labelFailure)...).Inc()
-		w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
-		w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
-
-		if w.opts.LoggerEnabled {
-			w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "Prepare", labelUnknown, td, err)...).Log(ctx, w.opts.LoggerLevel)
-		}
-		return nil, err
-	}
-	w.opts.Meter.Counter(meterRequestTotal, append(labels, labelStatus, labelSuccess)...).Inc()
-	w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
-	w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
-
-	if w.opts.LoggerEnabled {
-		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "Prepare", labelUnknown, td, err)...).Log(ctx, w.opts.LoggerLevel)
-	}
-
-	return &wrapperStmt{stmt: stmt, opts: w.opts, ctx: ctx}, nil
+	span  tracer.Span
 }
 
 // Close implements driver.Conn Close
@@ -77,7 +56,7 @@ func (w *wrapperConn) Close() error {
 	w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
 	w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
 
-	if w.opts.LoggerEnabled {
+	if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "Close", labelUnknown, td, err)...).Log(ctx, w.opts.LoggerLevel)
 	}
 
@@ -95,15 +74,14 @@ func (w *wrapperConn) Begin() (driver.Tx, error) {
 
 	labels := []string{labelMethod, "Begin"}
 	ts := time.Now()
-	// nolint:staticcheck
-	tx, err := w.conn.Begin()
+	tx, err := w.conn.Begin() // nolint:staticcheck
 	td := time.Since(ts)
 	te := td.Seconds()
 	if err != nil {
 		w.opts.Meter.Counter(meterRequestTotal, append(labels, labelStatus, labelFailure)...).Inc()
 		w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
 		w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
-		if w.opts.LoggerEnabled {
+		if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 			w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "Begin", labelUnknown, td, err)...).Log(ctx, w.opts.LoggerLevel)
 		}
 		return nil, err
@@ -111,9 +89,10 @@ func (w *wrapperConn) Begin() (driver.Tx, error) {
 	w.opts.Meter.Counter(meterRequestTotal, append(labels, labelStatus, labelSuccess)...).Inc()
 	w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
 	w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
-	if w.opts.LoggerEnabled {
+	if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "Begin", labelUnknown, td, err)...).Log(ctx, w.opts.LoggerLevel)
 	}
+
 	return &wrapperTx{tx: tx, opts: w.opts, ctx: ctx}, nil
 }
 
@@ -128,7 +107,12 @@ func (w *wrapperConn) BeginTx(ctx context.Context, opts driver.TxOptions) (drive
 		name = labelUnknown
 	}
 	labels := []string{labelMethod, "BeginTx", labelQuery, name}
-	if connBeginTx, ok := w.conn.(driver.ConnBeginTx); ok {
+
+	connBeginTx, ok := w.conn.(driver.ConnBeginTx)
+	if !ok {
+		return w.Begin()
+	}
+
 	ts := time.Now()
 	tx, err := connBeginTx.BeginTx(nctx, opts)
 	td := time.Since(ts)
@@ -139,38 +123,51 @@ func (w *wrapperConn) BeginTx(ctx context.Context, opts driver.TxOptions) (drive
 		w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
 		span.AddLabels("error", true)
 		span.AddLabels("err", err.Error())
-			if w.opts.LoggerEnabled {
+		if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 			w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "BeginTx", name, td, err)...).Log(ctx, w.opts.LoggerLevel)
 		}
 		return nil, err
 	}
 	w.opts.Meter.Counter(meterRequestTotal, append(labels, labelStatus, labelSuccess)...).Inc()
-		if w.opts.LoggerEnabled {
+	if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "BeginTx", name, td, err)...).Log(ctx, w.opts.LoggerLevel)
 	}
-		w.ctx = nctx
-		return &wrapperTx{ctx: ctx, tx: tx, opts: w.opts, span: span, conn: w}, nil
+	return &wrapperTx{tx: tx, opts: w.opts, ctx: ctx, span: span}, nil
 }
+
+// Prepare implements driver.Conn Prepare
+func (w *wrapperConn) Prepare(query string) (driver.Stmt, error) {
+	var ctx context.Context
+	if w.ctx != nil {
+		ctx = w.ctx
+	} else {
+		ctx = context.Background()
+	}
+
+	labels := []string{labelMethod, "Prepare", labelQuery, labelUnknown}
 	ts := time.Now()
-	// nolint:staticcheck
-	tx, err := w.conn.Begin()
+	stmt, err := w.conn.Prepare(query)
 	td := time.Since(ts)
 	te := td.Seconds()
 	if err != nil {
 		w.opts.Meter.Counter(meterRequestTotal, append(labels, labelStatus, labelFailure)...).Inc()
 		w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
 		w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
-		span.AddLabels("error", true)
-		span.AddLabels("err", err.Error())
+
+		if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
+			w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "Prepare", labelUnknown, td, err)...).Log(ctx, w.opts.LoggerLevel)
+		}
+		return nil, err
 	}
 	w.opts.Meter.Counter(meterRequestTotal, append(labels, labelStatus, labelSuccess)...).Inc()
 	w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
 	w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
-	if w.opts.LoggerEnabled {
-		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "BeginTx", name, td, err)...).Log(ctx, w.opts.LoggerLevel)
+
+	if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
+		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "Prepare", labelUnknown, td, err)...).Log(ctx, w.opts.LoggerLevel)
 	}
-	w.ctx = nctx
-	return &wrapperTx{ctx: ctx, tx: tx, opts: w.opts, span: span, conn: w}, nil
+
+	return wrapStmt(stmt, query, w.opts), nil
 }
 
 // PrepareContext implements driver.ConnPrepareContext PrepareContext
@@ -189,8 +186,13 @@ func (w *wrapperConn) PrepareContext(ctx context.Context, query string) (driver.
 	} else {
 		name = labelUnknown
 	}
+
 	labels := []string{labelMethod, "PrepareContext", labelQuery, name}
-	if conn, ok := w.conn.(driver.ConnPrepareContext); ok {
+	conn, ok := w.conn.(driver.ConnPrepareContext)
+	if !ok {
+		return w.Prepare(query)
+	}
+
 	ts := time.Now()
 	stmt, err := conn.PrepareContext(nctx, query)
 	td := time.Since(ts)
@@ -201,7 +203,7 @@ func (w *wrapperConn) PrepareContext(ctx context.Context, query string) (driver.
 		w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
 		span.AddLabels("error", true)
 		span.AddLabels("err", err.Error())
-			if w.opts.LoggerEnabled {
+		if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 			w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "PrepareContext", name, td, err)...).Log(ctx, w.opts.LoggerLevel)
 		}
 		return nil, err
@@ -209,29 +211,11 @@ func (w *wrapperConn) PrepareContext(ctx context.Context, query string) (driver.
 	w.opts.Meter.Counter(meterRequestTotal, append(labels, labelStatus, labelSuccess)...).Inc()
 	w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
 	w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
-		if w.opts.LoggerEnabled {
+	if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "PrepareContext", name, td, err)...).Log(ctx, w.opts.LoggerLevel)
 	}
-		return &wrapperStmt{stmt: stmt, opts: w.opts, ctx: nctx}, nil
-	}
-	ts := time.Now()
-	stmt, err := w.conn.Prepare(query)
-	td := time.Since(ts)
-	te := td.Seconds()
-	if err != nil {
-		w.opts.Meter.Counter(meterRequestTotal, append(labels, labelStatus, labelFailure)...).Inc()
-		w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
-		w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
-		span.AddLabels("error", true)
-		span.AddLabels("err", err.Error())
-	}
-	w.opts.Meter.Counter(meterRequestTotal, append(labels, labelStatus, labelSuccess)...).Inc()
-	w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
-	w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
-	if w.opts.LoggerEnabled {
-		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "PrepareContext", name, td, err)...).Log(ctx, w.opts.LoggerLevel)
-	}
-	return stmt, nil
+
+	return wrapStmt(stmt, query, w.opts), nil
 }
 
 // Exec implements driver.Execer Exec
@@ -242,15 +226,16 @@ func (w *wrapperConn) Exec(query string, args []driver.Value) (driver.Result, er
 	} else {
 		ctx = context.Background()
 	}
+	labels := []string{labelMethod, "Exec", labelQuery, labelUnknown}
+
 	// nolint:staticcheck
-	execer, ok := w.conn.(driver.Execer)
+	conn, ok := w.conn.(driver.Execer)
 	if !ok {
 		return nil, driver.ErrSkip
 	}
 
-	labels := []string{labelMethod, "Exec", labelQuery, labelUnknown}
 	ts := time.Now()
-	res, err := execer.Exec(query, args)
+	res, err := conn.Exec(query, args)
 	td := time.Since(ts)
 	te := td.Seconds()
 	if err != nil {
@@ -260,7 +245,7 @@ func (w *wrapperConn) Exec(query string, args []driver.Value) (driver.Result, er
 	}
 	w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
 	w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
-	if w.opts.LoggerEnabled {
+	if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "Exec", labelUnknown, td, err)...).Log(ctx, w.opts.LoggerLevel)
 	}
 	return res, err
@@ -270,6 +255,7 @@ func (w *wrapperConn) Exec(query string, args []driver.Value) (driver.Result, er
 func (w *wrapperConn) ExecContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Result, error) {
 	var nctx context.Context
 	var span tracer.Span
+
 	if w.ctx != nil {
 		nctx, span = w.opts.Tracer.Start(w.ctx, "ExecContext")
 	} else {
@@ -287,7 +273,14 @@ func (w *wrapperConn) ExecContext(ctx context.Context, query string, args []driv
 		span.AddLabels("args", fmt.Sprintf("%v", namedValueToLabels(args)))
 	}
 	labels := []string{labelMethod, "ExecContext", labelQuery, name}
-	if conn, ok := w.conn.(driver.ExecerContext); ok {
+	fmt.Printf("EXECCONTETX args %#+v\n", args)
+
+	conn, ok := w.conn.(driver.ExecerContext)
+	if !ok {
+		// nolint:staticcheck
+		return nil, driver.ErrSkip
+	}
+
 	ts := time.Now()
 	res, err := conn.ExecContext(nctx, query, args)
 	td := time.Since(ts)
@@ -302,49 +295,24 @@ func (w *wrapperConn) ExecContext(ctx context.Context, query string, args []driv
 	w.opts.Meter.Counter(meterRequestTotal, append(labels, labelStatus, labelSuccess)...).Inc()
 	w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
 	w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
-		if w.opts.LoggerEnabled {
-			w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "ExecContext", name, td, err)...).Log(ctx, w.opts.LoggerLevel)
-		}
-		return res, err
-	}
-	values, err := namedValueToValue(args)
-	if err != nil {
-		span.AddLabels("error", true)
-		span.AddLabels("err", err.Error())
-		if w.opts.LoggerEnabled {
-			w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "ExecContext", labelUnknown, 0, err)...).Log(ctx, w.opts.LoggerLevel)
-		}
-		return nil, err
-	}
-	ts := time.Now()
-	// nolint:staticcheck
-	res, err := w.Exec(query, values)
-	td := time.Since(ts)
-	te := td.Seconds()
-	if err != nil {
-		w.opts.Meter.Counter(meterRequestTotal, append(labels, labelStatus, labelFailure)...).Inc()
-		span.AddLabels("error", true)
-		span.AddLabels("err", err.Error())
-	} else {
-		w.opts.Meter.Counter(meterRequestTotal, append(labels, labelStatus, labelSuccess)...).Inc()
-	}
-	w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
-	w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
-	if w.opts.LoggerEnabled {
+	if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "ExecContext", name, td, err)...).Log(ctx, w.opts.LoggerLevel)
 	}
+
 	return res, err
 }
 
 // Ping implements driver.Pinger Ping
 func (w *wrapperConn) Ping(ctx context.Context) error {
 	conn, ok := w.conn.(driver.Pinger)
+
 	if !ok {
-		wc, err := w.d.Open(w.dname)
+		// fallback path to check db alive
+		pc, err := w.d.Open(w.dname)
 		if err != nil {
 			return err
 		}
-		return wc.Close()
+		return pc.Close()
 	}
 
 	var nctx context.Context
@@ -364,7 +332,7 @@ func (w *wrapperConn) Ping(ctx context.Context) error {
 		w.opts.Meter.Counter(meterRequestTotal, append(labels, labelStatus, labelFailure)...).Inc()
 		span.AddLabels("error", true)
 		span.AddLabels("err", err.Error())
-		if w.opts.LoggerEnabled {
+		if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 			w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "Ping", labelUnknown, td, err)...).Log(ctx, w.opts.LoggerLevel)
 		}
 		return err
@@ -385,7 +353,6 @@ func (w *wrapperConn) Query(query string, args []driver.Value) (driver.Rows, err
 	} else {
 		ctx = context.Background()
 	}
-
 	// nolint:staticcheck
 	conn, ok := w.conn.(driver.Queryer)
 	if !ok {
@@ -404,7 +371,7 @@ func (w *wrapperConn) Query(query string, args []driver.Value) (driver.Rows, err
 	}
 	w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
 	w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
-	if w.opts.LoggerEnabled {
+	if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "Query", labelUnknown, td, err)...).Log(ctx, w.opts.LoggerLevel)
 	}
 	return rows, err
@@ -431,7 +398,11 @@ func (w *wrapperConn) QueryContext(ctx context.Context, query string, args []dri
 		span.AddLabels("args", fmt.Sprintf("%v", namedValueToLabels(args)))
 	}
 	labels := []string{labelMethod, "QueryContext", labelQuery, name}
-	if conn, ok := w.conn.(driver.QueryerContext); ok {
+	conn, ok := w.conn.(driver.QueryerContext)
+	if !ok {
+		return nil, driver.ErrSkip
+	}
+
 	ts := time.Now()
 	rows, err := conn.QueryContext(nctx, query, args)
 	td := time.Since(ts)
@@ -445,36 +416,35 @@ func (w *wrapperConn) QueryContext(ctx context.Context, query string, args []dri
 	}
 	w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
 	w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
-		if w.opts.LoggerEnabled {
+	if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "QueryContext", name, td, err)...).Log(ctx, w.opts.LoggerLevel)
 	}
+
 	return rows, err
 }
-	values, err := namedValueToValue(args)
-	if err != nil {
-		span.AddLabels("error", true)
-		span.AddLabels("err", err.Error())
-		if w.opts.LoggerEnabled {
-			w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "QueryContext", name, 0, err)...).Log(ctx, w.opts.LoggerLevel)
+
+// CheckNamedValue implements driver.NamedValueChecker
+func (w *wrapperConn) CheckNamedValue(v *driver.NamedValue) error {
+	s, ok := w.conn.(driver.NamedValueChecker)
+	if !ok {
+		return driver.ErrSkip
 	}
-		return nil, err
+	return s.CheckNamedValue(v)
 }
-	ts := time.Now()
-	// nolint:staticcheck
-	rows, err := w.Query(query, values)
-	td := time.Since(ts)
-	te := td.Seconds()
-	if err != nil {
-		w.opts.Meter.Counter(meterRequestTotal, append(labels, labelStatus, labelFailure)...).Inc()
-		span.AddLabels("error", true)
-		span.AddLabels("err", err.Error())
-	} else {
-		w.opts.Meter.Counter(meterRequestTotal, append(labels, labelStatus, labelSuccess)...).Inc()
+
+// IsValid implements driver.Validator
+func (w *wrapperConn) IsValid() bool {
+	v, ok := w.conn.(driver.Validator)
+	if !ok {
+		return w.conn != nil
 	}
-	w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
-	w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
-	if w.opts.LoggerEnabled {
-		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "QueryContext", name, td, err)...).Log(ctx, w.opts.LoggerLevel)
+	return v.IsValid()
 }
-	return rows, err
+
+func (w *wrapperConn) ResetSession(ctx context.Context) error {
+	s, ok := w.conn.(driver.SessionResetter)
+	if !ok {
+		return driver.ErrSkip
+	}
+	return s.ResetSession(ctx)
 }

doc.go

@@ -1,2 +1,2 @@
 // package wrapper provides SQL driver wrapper with micro tracing, logging, metering capabilities
-package wrapper // import "go.unistack.org/micro-wrapper-sql/v3"
+package wrapper

driver.go

@@ -6,20 +6,73 @@ import (
 	"time"
 )
 
+var (
+// _ driver.DriverContext = (*wrapperDriver)(nil)
+// _ driver.Connector     = (*wrapperDriver)(nil)
+)
+
+type conn interface {
+	driver.Pinger
+	driver.Execer
+	driver.ExecerContext
+	driver.Queryer
+	driver.QueryerContext
+	driver.Conn
+	driver.ConnPrepareContext
+	driver.ConnBeginTx
+}
+
 // wrapperDriver defines a wrapper for driver.Driver
 type wrapperDriver struct {
 	driver    driver.Driver
+	connector driver.Connector
 	opts      Options
 	ctx       context.Context
 }
 
+type wrapperConnector struct {
+	driver driver.Driver
+	name   string
+	opts   Options
+}
+
 // NewWrapper creates and returns a new SQL driver with passed capabilities
 func NewWrapper(d driver.Driver, opts ...Option) driver.Driver {
 	return &wrapperDriver{driver: d, opts: NewOptions(opts...), ctx: context.Background()}
 }
 
+/*
+// Connect implements driver.Driver Connect
+func (w *wrapperConnector) Connect(ctx context.Context) (driver.Conn, error) {
+	return w.driver.Connect(ctx)
+}
+
+// Driver implements driver.Driver Driver
+func (w *wrapperConnector) Driver() driver.Driver {
+	return w.driver
+}
+*/
+
+/*
+// Connect implements driver.Driver OpenConnector
+func (w *wrapperDriver) OpenConnector(name string) (driver.Conn, error) {
+	return &wrapperConnector{driver: w.driver, name: name, opts: w.opts}, nil
+}
+*/
+
 // Open implements driver.Driver Open
 func (w *wrapperDriver) Open(name string) (driver.Conn, error) {
+	// ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second) // Ensure eventual timeout
+	// defer cancel()
+
+	/*
+		connector, err := w.OpenConnector(name)
+		if err != nil {
+			return nil, err
+		}
+		return connector.Connect(ctx)
+	*/
+
 	ts := time.Now()
 	c, err := w.driver.Open(name)
 	td := time.Since(ts)
@@ -27,10 +80,9 @@ func (w *wrapperDriver) Open(name string) (driver.Conn, error) {
 	if w.opts.LoggerEnabled {
 		w.opts.Logger.Fields(w.opts.LoggerObserver(w.ctx, "Open", labelUnknown, td, err)...).Log(w.ctx, w.opts.LoggerLevel)
 	}
-
 	if err != nil {
 		return nil, err
 	}
 
-	return &wrapperConn{d: w, dname: name, conn: c, opts: w.opts, ctx: w.ctx}, nil
+	return wrapConn(c, w.opts), nil
 }

gen.go

@@ -0,0 +1,167 @@
+//go:build ignore
+
+package main
+
+import (
+	"bytes"
+	"crypto/md5"
+	"fmt"
+	"io"
+	"sort"
+	"strings"
+)
+
+var connIfaces = []string{
+	"driver.ConnBeginTx",
+	"driver.ConnPrepareContext",
+	"driver.Execer",
+	"driver.ExecerContext",
+	"driver.NamedValueChecker",
+	"driver.Pinger",
+	"driver.Queryer",
+	"driver.QueryerContext",
+	"driver.SessionResetter",
+	"driver.Validator",
+}
+
+var stmtIfaces = []string{
+	"driver.StmtExecContext",
+	"driver.StmtQueryContext",
+	"driver.ColumnConverter",
+	"driver.NamedValueChecker",
+}
+
+func getHash(s []string) string {
+	h := md5.New()
+	io.WriteString(h, strings.Join(s, "|"))
+	return fmt.Sprintf("%x", h.Sum(nil))
+}
+
+func main() {
+	comboConn := all(connIfaces)
+
+	sort.Slice(comboConn, func(i, j int) bool {
+		return len(comboConn[i]) < len(comboConn[j])
+	})
+
+	comboStmt := all(stmtIfaces)
+
+	sort.Slice(comboStmt, func(i, j int) bool {
+		return len(comboStmt[i]) < len(comboStmt[j])
+	})
+
+	b := bytes.NewBuffer(nil)
+	b.WriteString("// Code generated. DO NOT EDIT.\n\n")
+	b.WriteString("package wrapper\n\n")
+	b.WriteString(`import "database/sql/driver"`)
+	b.WriteString("\n\n")
+
+	b.WriteString("func wrapConn(dc driver.Conn, opts Options) driver.Conn {\n")
+	b.WriteString("\tc := &wrapperConn{conn: dc, opts: opts}\n")
+
+	for idx := len(comboConn) - 1; idx >= 0; idx-- {
+		ifaces := comboConn[idx]
+		n := len(ifaces)
+		if n == 0 {
+			continue
+		}
+		h := getHash(ifaces)
+		b.WriteString(fmt.Sprintf("\tif v, ok := dc.(wrapConn%04d_%s); ok {\n", n, h))
+		b.WriteString("\treturn struct {\n")
+		b.WriteString("\t\tdriver.Conn\n")
+		b.WriteString(fmt.Sprintf("\t\t\t%s", strings.Join(ifaces, "\n\t\t\t")))
+		b.WriteString("\t\t\n}{")
+		for idx := range ifaces {
+			if idx > 0 {
+				b.WriteString(", ")
+				b.WriteString("v")
+			} else if idx == 0 {
+				b.WriteString("c")
+			} else {
+				b.WriteString("v")
+			}
+		}
+		b.WriteString(", v}\n")
+		b.WriteString("}\n\n")
+	}
+	b.WriteString("return c\n")
+	b.WriteString("}\n")
+
+	for idx := len(comboConn) - 1; idx >= 0; idx-- {
+		ifaces := comboConn[idx]
+		n := len(ifaces)
+		if n == 0 {
+			continue
+		}
+		h := getHash(ifaces)
+		b.WriteString(fmt.Sprintf("// %s\n", strings.Join(ifaces, "|")))
+		b.WriteString(fmt.Sprintf("type wrapConn%04d_%s interface {\n", n, h))
+		for _, iface := range ifaces {
+			b.WriteString(fmt.Sprintf("\t%s\n", iface))
+		}
+		b.WriteString("}\n\n")
+	}
+
+	b.WriteString("func wrapStmt(stmt driver.Stmt, query string, opts Options) driver.Stmt {\n")
+	b.WriteString("\tc := &wrapperStmt{stmt: stmt, query: query, opts: opts}\n")
+
+	for idx := len(comboStmt) - 1; idx >= 0; idx-- {
+		ifaces := comboStmt[idx]
+		n := len(ifaces)
+		if n == 0 {
+			continue
+		}
+		h := getHash(ifaces)
+		b.WriteString(fmt.Sprintf("\tif v, ok := stmt.(wrapStmt%04d_%s); ok {\n", n, h))
+		b.WriteString("\treturn struct {\n")
+		b.WriteString("\t\tdriver.Stmt\n")
+		b.WriteString(fmt.Sprintf("\t\t\t%s", strings.Join(ifaces, "\n\t\t\t")))
+		b.WriteString("\t\t\n}{")
+		for idx := range ifaces {
+			if idx > 0 {
+				b.WriteString(", ")
+				b.WriteString("v")
+			} else if idx == 0 {
+				b.WriteString("c")
+			} else {
+				b.WriteString("v")
+			}
+		}
+		b.WriteString(", v}\n")
+		b.WriteString("}\n\n")
+	}
+	b.WriteString("return c\n")
+	b.WriteString("}\n")
+
+	for idx := len(comboStmt) - 1; idx >= 0; idx-- {
+		ifaces := comboStmt[idx]
+		n := len(ifaces)
+		if n == 0 {
+			continue
+		}
+		h := getHash(ifaces)
+		b.WriteString(fmt.Sprintf("// %s\n", strings.Join(ifaces, "|")))
+		b.WriteString(fmt.Sprintf("type wrapStmt%04d_%s interface {\n", n, h))
+		for _, iface := range ifaces {
+			b.WriteString(fmt.Sprintf("\t%s\n", iface))
+		}
+		b.WriteString("}\n\n")
+	}
+
+	fmt.Printf("%s\n", b.String())
+}
+
+// all returns all combinations for a given string array.
+func all[T any](set []T) (subsets [][]T) {
+	length := uint(len(set))
+	for subsetBits := 1; subsetBits < (1 << length); subsetBits++ {
+		var subset []T
+		for object := uint(0); object < length; object++ {
+			if (subsetBits>>object)&1 == 1 {
+				subset = append(subset, set[object])
+			}
+		}
+		subsets = append(subsets, subset)
+	}
+	return subsets
+}

go.mod

@@ -1,5 +1,5 @@
-module go.unistack.org/micro-wrapper-sql/v3
+module go.unistack.org/micro-wrapper-sql/v4
 
-go 1.16
+go 1.19
 
-require go.unistack.org/micro/v3 v3.10.14
+require go.unistack.org/micro/v4 v4.0.3

go.sum

@@ -1,8 +1,2 @@
-github.com/imdario/mergo v0.3.13/go.mod h1:4lJ1jqUDcsbIECGy0RUJAXNIhg+6ocWgb1ALK2O4oXg=
-github.com/patrickmn/go-cache v2.1.0+incompatible/go.mod h1:3Qf8kWWT7OJRJbdiICTKqZju1ZixQ/KpMGzzAfe6+WQ=
-github.com/silas/dag v0.0.0-20211117232152-9d50aa809f35/go.mod h1:7RTUFBdIRC9nZ7/3RyRNH1bdqIShrDejd1YbLwgPS+I=
-go.unistack.org/micro/v3 v3.10.14 h1:7fgLpwGlCN67twhwtngJDEQvrMkUBDSA5vzZqxIDqNE=
-go.unistack.org/micro/v3 v3.10.14/go.mod h1:uMAc0U/x7dmtICCrblGf0ZLgYegu3VwQAquu+OFCw1Q=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v3 v3.0.0/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+go.unistack.org/micro/v4 v4.0.3 h1:AFr21ua3IrkuxH26kNYVrs7Kpsrm+4aylE/PfjLdCWM=
+go.unistack.org/micro/v4 v4.0.3/go.mod h1:+wBa98rSf+mRXb/MuSVFPXtDrqN0k8rzPQiC8wRCwCo=

options.go

@@ -5,9 +5,9 @@ import (
 	"fmt"
 	"time"
 
-	"go.unistack.org/micro/v3/logger"
-	"go.unistack.org/micro/v3/meter"
-	"go.unistack.org/micro/v3/tracer"
+	"go.unistack.org/micro/v4/logger"
+	"go.unistack.org/micro/v4/meter"
+	"go.unistack.org/micro/v4/tracer"
 )
 
 var (

stats.go

@@ -1,4 +1,4 @@
-package wrapper // import "go.unistack.org/micro-wrapper-sql/v3"
+package wrapper // import "go.unistack.org/micro-wrapper-sql-1/v3"
 
 import (
 	"context"

stmt.go

@@ -6,15 +6,21 @@ import (
 	"fmt"
 	"time"
 
-	"go.unistack.org/micro/v3/tracer"
+	"go.unistack.org/micro/v4/tracer"
 )
 
-var _ driver.Stmt = &wrapperStmt{}
+var (
+	_ driver.Stmt              = (*wrapperStmt)(nil)
+	_ driver.StmtQueryContext  = (*wrapperStmt)(nil)
+	_ driver.StmtExecContext   = (*wrapperStmt)(nil)
+	_ driver.NamedValueChecker = (*wrapperStmt)(nil)
+)
 
 // wrapperStmt defines a wrapper for driver.Stmt
 type wrapperStmt struct {
 	stmt  driver.Stmt
 	opts  Options
+	query string
 	ctx   context.Context
 }
 
@@ -39,7 +45,7 @@ func (w *wrapperStmt) Close() error {
 	w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
 	w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
 
-	if w.opts.LoggerEnabled {
+	if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "Close", labelUnknown, td, err)...).Log(ctx, w.opts.LoggerLevel)
 	}
 	return err
@@ -50,6 +56,15 @@ func (w *wrapperStmt) NumInput() int {
 	return w.stmt.NumInput()
 }
 
+// CheckNamedValue implements driver.NamedValueChecker
+func (w *wrapperStmt) CheckNamedValue(v *driver.NamedValue) error {
+	s, ok := w.stmt.(driver.NamedValueChecker)
+	if !ok {
+		return driver.ErrSkip
+	}
+	return s.CheckNamedValue(v)
+}
+
 // Exec implements driver.Stmt Exec
 func (w *wrapperStmt) Exec(args []driver.Value) (driver.Result, error) {
 	var ctx context.Context
@@ -72,9 +87,10 @@ func (w *wrapperStmt) Exec(args []driver.Value) (driver.Result, error) {
 	w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
 	w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
 
-	if w.opts.LoggerEnabled {
+	if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "Exec", labelUnknown, td, err)...).Log(ctx, w.opts.LoggerLevel)
 	}
+
 	return res, err
 }
 
@@ -100,14 +116,15 @@ func (w *wrapperStmt) Query(args []driver.Value) (driver.Rows, error) {
 	w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
 	w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
 
-	if w.opts.LoggerEnabled {
+	if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "Query", labelUnknown, td, err)...).Log(ctx, w.opts.LoggerLevel)
 	}
+
 	return rows, err
 }
 
-// ExecContext implements driver.ExecerContext ExecContext
-func (w *wrapperStmt) ExecContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Result, error) {
+// ExecContext implements driver.StmtExecContext ExecContext
+func (w *wrapperStmt) ExecContext(ctx context.Context, args []driver.NamedValue) (driver.Result, error) {
 	var nctx context.Context
 	var span tracer.Span
 	if w.ctx != nil {
@@ -127,9 +144,10 @@ func (w *wrapperStmt) ExecContext(ctx context.Context, query string, args []driv
 		span.AddLabels("args", fmt.Sprintf("%v", namedValueToLabels(args)))
 	}
 	labels := []string{labelMethod, "ExecContext", labelQuery, name}
-	if conn, ok := w.stmt.(driver.ExecerContext); ok {
+
+	if conn, ok := w.stmt.(driver.StmtExecContext); ok {
 		ts := time.Now()
-		res, err := conn.ExecContext(nctx, query, args)
+		res, err := conn.ExecContext(nctx, args)
 		td := time.Since(ts)
 		te := td.Seconds()
 		if err != nil {
@@ -142,25 +160,25 @@ func (w *wrapperStmt) ExecContext(ctx context.Context, query string, args []driv
 		w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
 		w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
 
-		if w.opts.LoggerEnabled {
+		if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 			w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "ExecContext", name, td, err)...).Log(ctx, w.opts.LoggerLevel)
 		}
 		return res, err
 	}
+
 	values, err := namedValueToValue(args)
 	if err != nil {
 		w.opts.Meter.Counter(meterRequestTotal, append(labels, labelStatus, labelFailure)...).Inc()
 		span.AddLabels("error", true)
 		span.AddLabels("err", err.Error())
 
-		if w.opts.LoggerEnabled {
+		if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 			w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "ExecContext", name, 0, err)...).Log(ctx, w.opts.LoggerLevel)
 		}
 		return nil, err
 	}
 	ts := time.Now()
-	// nolint:staticcheck
-	res, err := w.Exec(values)
+	res, err := w.Exec(values) // nolint:staticcheck
 	td := time.Since(ts)
 	te := td.Seconds()
 	if err != nil {
@@ -174,14 +192,15 @@ func (w *wrapperStmt) ExecContext(ctx context.Context, query string, args []driv
 	w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
 	w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
 
-	if w.opts.LoggerEnabled {
-		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "ExecContext", name, td, err)).Log(ctx, w.opts.LoggerLevel)
+	if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
+		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "ExecContext", name, td, err)...).Log(ctx, w.opts.LoggerLevel)
 	}
+
 	return res, err
 }
 
-// QueryContext implements Driver.QueryerContext QueryContext
-func (w *wrapperStmt) QueryContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Rows, error) {
+// QueryContext implements driver.StmtQueryContext StmtQueryContext
+func (w *wrapperStmt) QueryContext(ctx context.Context, args []driver.NamedValue) (driver.Rows, error) {
 	var nctx context.Context
 	var span tracer.Span
 	if w.ctx != nil {
@@ -201,9 +220,9 @@ func (w *wrapperStmt) QueryContext(ctx context.Context, query string, args []dri
 		span.AddLabels("args", fmt.Sprintf("%v", namedValueToLabels(args)))
 	}
 	labels := []string{labelMethod, "QueryContext", labelQuery, name}
-	if conn, ok := w.stmt.(driver.QueryerContext); ok {
+	if conn, ok := w.stmt.(driver.StmtQueryContext); ok {
 		ts := time.Now()
-		rows, err := conn.QueryContext(nctx, query, args)
+		rows, err := conn.QueryContext(nctx, args)
 		td := time.Since(ts)
 		te := td.Seconds()
 		if err != nil {
@@ -217,11 +236,12 @@ func (w *wrapperStmt) QueryContext(ctx context.Context, query string, args []dri
 		w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
 		w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
 
-		if w.opts.LoggerEnabled {
-			w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "QueryContext", name, td, err)).Log(ctx, w.opts.LoggerLevel)
+		if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
+			w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "QueryContext", name, td, err)...).Log(ctx, w.opts.LoggerLevel)
 		}
 		return rows, err
 	}
+
 	values, err := namedValueToValue(args)
 	if err != nil {
 		w.opts.Meter.Counter(meterRequestTotal, append(labels, labelStatus, labelFailure)...).Inc()
@@ -229,14 +249,13 @@ func (w *wrapperStmt) QueryContext(ctx context.Context, query string, args []dri
 		span.AddLabels("error", true)
 		span.AddLabels("err", err.Error())
 
-		if w.opts.LoggerEnabled {
+		if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 			w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "QueryContext", name, 0, err)...).Log(ctx, w.opts.LoggerLevel)
 		}
 		return nil, err
 	}
 	ts := time.Now()
-	// nolint:staticcheck
-	rows, err := w.Query(values)
+	rows, err := w.Query(values) // nolint:staticcheck
 	td := time.Since(ts)
 	te := td.Seconds()
 	if err != nil {
@@ -250,8 +269,9 @@ func (w *wrapperStmt) QueryContext(ctx context.Context, query string, args []dri
 	w.opts.Meter.Summary(meterRequestLatencyMicroseconds, labels...).Update(te)
 	w.opts.Meter.Histogram(meterRequestDurationSeconds, labels...).Update(te)
 
-	if w.opts.LoggerEnabled {
+	if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 		w.opts.Logger.Fields(w.opts.LoggerObserver(ctx, "QueryContext", name, td, err)...).Log(ctx, w.opts.LoggerLevel)
 	}
+
 	return rows, err
 }

tx.go

@@ -5,64 +5,61 @@ import (
 	"database/sql/driver"
 	"time"
 
-	"go.unistack.org/micro/v3/tracer"
+	"go.unistack.org/micro/v4/tracer"
 )
 
-var _ driver.Tx = &wrapperTx{}
+var _ driver.Tx = (*wrapperTx)(nil)
 
 // wrapperTx defines a wrapper for driver.Tx
 type wrapperTx struct {
 	tx   driver.Tx
 	span tracer.Span
 	opts Options
-	conn *wrapperConn
 	ctx  context.Context
 }
 
 // Commit implements driver.Tx Commit
 func (w *wrapperTx) Commit() error {
-	if w.span != nil {
-		defer w.span.Finish()
-	}
 	ts := time.Now()
 	err := w.tx.Commit()
 	td := time.Since(ts)
 
+	if w.span != nil {
 		if err != nil {
 			w.span.AddLabels("error", true)
 			w.span.AddLabels("err", err.Error())
 		}
+		w.span.Finish()
+	}
 
-	if w.opts.LoggerEnabled {
+	if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 		w.opts.Logger.Fields(w.opts.LoggerObserver(w.ctx, "Commit", labelUnknown, td, err)...).Log(w.ctx, w.opts.LoggerLevel)
 	}
 
 	w.ctx = nil
-	w.conn.ctx = nil
 
 	return err
 }
 
 // Rollback implements driver.Tx Rollback
 func (w *wrapperTx) Rollback() error {
-	if w.span != nil {
-		defer w.span.Finish()
-	}
 	ts := time.Now()
 	err := w.tx.Rollback()
 	td := time.Since(ts)
 
+	if w.span != nil {
 		if err != nil {
 			w.span.AddLabels("error", true)
 			w.span.AddLabels("err", err.Error())
 		}
+		w.span.Finish()
+	}
 
-	if w.opts.LoggerEnabled {
+	if w.opts.LoggerEnabled && w.opts.Logger.V(w.opts.LoggerLevel) {
 		w.opts.Logger.Fields(w.opts.LoggerObserver(w.ctx, "Rollback", labelUnknown, td, err)...).Log(w.ctx, w.opts.LoggerLevel)
 	}
 
 	w.ctx = nil
-	w.conn.ctx = nil
 
 	return err
 }

wrap.go

@@ -0,0 +1,129 @@
+package wrapper
+
+import (
+	"database/sql/driver"
+)
+
+func wrapDriver(d driver.Driver, opts Options) driver.Driver {
+	if _, ok := d.(driver.DriverContext); ok {
+		return &wrapperDriver{driver: d, opts: opts}
+	}
+	return struct{ driver.Driver }{&wrapperDriver{driver: d, opts: opts}}
+}
+
+/*
+func wrapStmt(stmt driver.Stmt, query string, opts Options) driver.Stmt {
+	var (
+		_, hasExeCtx     = stmt.(driver.StmtExecContext)
+		_, hasQryCtx     = stmt.(driver.StmtQueryContext)
+		wc, hasColConv   = stmt.(driver.ColumnConverter) //nolint:staticcheck
+		wn, hasNamValChk = stmt.(driver.NamedValueChecker)
+	)
+
+	ws := &wrapperStmt{stmt: stmt, query: query, opts: opts}
+	switch {
+	case !hasExeCtx && !hasQryCtx && !hasColConv && !hasNamValChk:
+		return struct {
+			driver.Stmt
+		}{ws}
+	case !hasExeCtx && hasQryCtx && !hasColConv && !hasNamValChk:
+		return struct {
+			driver.Stmt
+			driver.StmtQueryContext
+		}{ws, ws}
+	case hasExeCtx && !hasQryCtx && !hasColConv && !hasNamValChk:
+		return struct {
+			driver.Stmt
+			driver.StmtExecContext
+		}{ws, ws}
+	case hasExeCtx && hasQryCtx && !hasColConv && !hasNamValChk:
+		return struct {
+			driver.Stmt
+			driver.StmtExecContext
+			driver.StmtQueryContext
+		}{ws, ws, ws}
+	case !hasExeCtx && !hasQryCtx && hasColConv && !hasNamValChk:
+		return struct {
+			driver.Stmt
+			driver.ColumnConverter
+		}{ws, wc}
+	case !hasExeCtx && hasQryCtx && hasColConv && !hasNamValChk:
+		return struct {
+			driver.Stmt
+			driver.StmtQueryContext
+			driver.ColumnConverter
+		}{ws, ws, wc}
+	case hasExeCtx && !hasQryCtx && hasColConv && !hasNamValChk:
+		return struct {
+			driver.Stmt
+			driver.StmtExecContext
+			driver.ColumnConverter
+		}{ws, ws, wc}
+	case hasExeCtx && hasQryCtx && hasColConv && !hasNamValChk:
+		return struct {
+			driver.Stmt
+			driver.StmtExecContext
+			driver.StmtQueryContext
+			driver.ColumnConverter
+		}{ws, ws, ws, wc}
+	case !hasExeCtx && !hasQryCtx && !hasColConv && hasNamValChk:
+		return struct {
+			driver.Stmt
+			driver.NamedValueChecker
+		}{ws, wn}
+	case !hasExeCtx && hasQryCtx && !hasColConv && hasNamValChk:
+		return struct {
+			driver.Stmt
+			driver.StmtQueryContext
+			driver.NamedValueChecker
+		}{ws, ws, wn}
+	case hasExeCtx && !hasQryCtx && !hasColConv && hasNamValChk:
+		return struct {
+			driver.Stmt
+			driver.StmtExecContext
+			driver.NamedValueChecker
+		}{ws, ws, wn}
+	case hasExeCtx && hasQryCtx && !hasColConv && hasNamValChk:
+		return struct {
+			driver.Stmt
+			driver.StmtExecContext
+			driver.StmtQueryContext
+			driver.NamedValueChecker
+		}{ws, ws, ws, wn}
+	case !hasExeCtx && !hasQryCtx && hasColConv && hasNamValChk:
+		return struct {
+			driver.Stmt
+			driver.ColumnConverter
+			driver.NamedValueChecker
+		}{ws, wc, wn}
+	case !hasExeCtx && hasQryCtx && hasColConv && hasNamValChk:
+		return struct {
+			driver.Stmt
+			driver.StmtQueryContext
+			driver.ColumnConverter
+			driver.NamedValueChecker
+		}{ws, ws, wc, wn}
+	case hasExeCtx && !hasQryCtx && hasColConv && hasNamValChk:
+		return struct {
+			driver.Stmt
+			driver.StmtExecContext
+			driver.ColumnConverter
+			driver.NamedValueChecker
+		}{ws, ws, wc, wn}
+	case hasExeCtx && hasQryCtx && hasColConv && hasNamValChk:
+		return struct {
+			driver.Stmt
+			driver.StmtExecContext
+			driver.StmtQueryContext
+			driver.ColumnConverter
+			driver.NamedValueChecker
+		}{ws, ws, ws, wc, wn}
+	}
+	panic("unreachable")
+}
+*/
+
+// WrapConn allows an existing driver.Conn to be wrapped.
+func WrapConn(c driver.Conn, opts ...Option) driver.Conn {
+	return wrapConn(c, NewOptions(opts...))
+}