BoolCodec EncodePlan actually plans

pgtype/bool.go

@@ -8,7 +8,11 @@ import (
 )
 
 type BoolScanner interface {
-	ScanBool(v bool, valid bool) error
+	ScanBool(v Bool) error
+}
+
+type BoolValuer interface {
+	BoolValue() (Bool, error)
 }
 
 type Bool struct {
@@ -16,18 +20,15 @@ type Bool struct {
 	Valid bool
 }
 
-// ScanBool implements the BoolScanner interface.
-func (dst *Bool) ScanBool(v bool, valid bool) error {
-	if !valid {
-		*dst = Bool{}
-		return nil
-	}
-
-	*dst = Bool{Bool: v, Valid: true}
-
+func (b *Bool) ScanBool(v Bool) error {
+	*b = v
 	return nil
 }
 
+func (b Bool) BoolValue() (Bool, error) {
+	return b, nil
+}
+
 // Scan implements the database/sql Scanner interface.
 func (dst *Bool) Scan(src interface{}) error {
 	if src == nil {
@@ -108,27 +109,28 @@ func (BoolCodec) PreferredFormat() int16 {
 func (BoolCodec) PlanEncode(ci *ConnInfo, oid uint32, format int16, value interface{}) EncodePlan {
 	switch format {
 	case BinaryFormatCode:
-		return encodePlanBoolCodecBinary{}
+		switch value.(type) {
+		case bool:
+			return encodePlanBoolCodecBinaryBool{}
+		case BoolValuer:
+			return encodePlanBoolCodecBinaryBoolScanner{}
+		}
 	case TextFormatCode:
-		return encodePlanBoolCodecText{}
+		switch value.(type) {
+		case bool:
+			return encodePlanBoolCodecTextBool{}
+		case BoolValuer:
+			return encodePlanBoolCodecTextBoolScanner{}
+		}
 	}
 
 	return nil
 }
 
-type encodePlanBoolCodecBinary struct{}
+type encodePlanBoolCodecBinaryBool struct{}
 
-func (encodePlanBoolCodecBinary) Encode(value interface{}, buf []byte) (newBuf []byte, err error) {
-	v, valid, err := convertToBoolForEncode(value)
-	if err != nil {
-		return nil, fmt.Errorf("cannot convert %v to bool: %v", value, err)
-	}
-	if !valid {
-		return nil, nil
-	}
-	if value == nil {
-		return nil, nil
-	}
+func (encodePlanBoolCodecBinaryBool) Encode(value interface{}, buf []byte) (newBuf []byte, err error) {
+	v := value.(bool)
 
 	if v {
 		buf = append(buf, 1)
@@ -139,20 +141,53 @@ func (encodePlanBoolCodecBinary) Encode(value interface{}, buf []byte) (newBuf [
 	return buf, nil
 }
 
-type encodePlanBoolCodecText struct{}
+type encodePlanBoolCodecTextBoolScanner struct{}
 
-func (encodePlanBoolCodecText) Encode(value interface{}, buf []byte) (newBuf []byte, err error) {
-	v, valid, err := convertToBoolForEncode(value)
+func (encodePlanBoolCodecTextBoolScanner) Encode(value interface{}, buf []byte) (newBuf []byte, err error) {
+	b, err := value.(BoolValuer).BoolValue()
 	if err != nil {
-		return nil, fmt.Errorf("cannot convert %v to bool: %v", value, err)
+		return nil, err
 	}
-	if !valid {
+
+	if !b.Valid {
 		return nil, nil
 	}
-	if value == nil {
+
+	if b.Bool {
+		buf = append(buf, 't')
+	} else {
+		buf = append(buf, 'f')
+	}
+
+	return buf, nil
+}
+
+type encodePlanBoolCodecBinaryBoolScanner struct{}
+
+func (encodePlanBoolCodecBinaryBoolScanner) Encode(value interface{}, buf []byte) (newBuf []byte, err error) {
+	b, err := value.(BoolValuer).BoolValue()
+	if err != nil {
+		return nil, err
+	}
+
+	if !b.Valid {
 		return nil, nil
 	}
 
+	if b.Bool {
+		buf = append(buf, 1)
+	} else {
+		buf = append(buf, 0)
+	}
+
+	return buf, nil
+}
+
+type encodePlanBoolCodecTextBool struct{}
+
+func (encodePlanBoolCodecTextBool) Encode(value interface{}, buf []byte) (newBuf []byte, err error) {
+	v := value.(bool)
+
 	if v {
 		buf = append(buf, 't')
 	} else {
@@ -288,14 +323,14 @@ func (scanPlanBinaryBoolToBoolScanner) Scan(ci *ConnInfo, oid uint32, formatCode
 	}
 
 	if src == nil {
-		return s.ScanBool(false, false)
+		return s.ScanBool(Bool{})
 	}
 
 	if len(src) != 1 {
 		return fmt.Errorf("invalid length for bool: %v", len(src))
 	}
 
-	return s.ScanBool(src[0] == 1, true)
+	return s.ScanBool(Bool{Bool: src[0] == 1, Valid: true})
 }
 
 type scanPlanTextAnyToBoolScanner struct{}
@@ -307,12 +342,12 @@ func (scanPlanTextAnyToBoolScanner) Scan(ci *ConnInfo, oid uint32, formatCode in
 	}
 
 	if src == nil {
-		return s.ScanBool(false, false)
+		return s.ScanBool(Bool{})
 	}
 
 	if len(src) != 1 {
 		return fmt.Errorf("invalid length for bool: %v", len(src))
 	}
 
-	return s.ScanBool(src[0] == 't', true)
+	return s.ScanBool(Bool{Bool: src[0] == 't', Valid: true})
 }