forked from go-jet/jet
/
utill.go
367 lines (284 loc) · 8.5 KB
/
utill.go
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package qrm
import (
"database/sql"
"fmt"
"github.com/go-jet/jet/internal/utils"
"github.com/go-jet/jet/qrm/internal"
"github.com/google/uuid"
"reflect"
"strings"
"time"
)
var scannerInterfaceType = reflect.TypeOf((*sql.Scanner)(nil)).Elem()
func implementsScannerType(fieldType reflect.Type) bool {
if fieldType.Implements(scannerInterfaceType) {
return true
}
typePtr := reflect.New(fieldType).Type()
return typePtr.Implements(scannerInterfaceType)
}
func getScanner(value reflect.Value) sql.Scanner {
if scanner, ok := value.Interface().(sql.Scanner); ok {
return scanner
}
return value.Addr().Interface().(sql.Scanner)
}
func getSliceElemType(slicePtrValue reflect.Value) reflect.Type {
sliceTypePtr := slicePtrValue.Type()
elemType := indirectType(sliceTypePtr).Elem()
return indirectType(elemType)
}
func getSliceElemPtrAt(slicePtrValue reflect.Value, index int) reflect.Value {
sliceValue := slicePtrValue.Elem()
elem := sliceValue.Index(index)
if elem.Kind() == reflect.Ptr {
return elem
}
return elem.Addr()
}
func appendElemToSlice(slicePtrValue reflect.Value, objPtrValue reflect.Value) error {
utils.MustBeTrue(!slicePtrValue.IsNil(), "jet: internal, slice is nil")
sliceValue := slicePtrValue.Elem()
sliceElemType := sliceValue.Type().Elem()
newElemValue := objPtrValue
if sliceElemType.Kind() != reflect.Ptr {
newElemValue = objPtrValue.Elem()
}
if newElemValue.Type().ConvertibleTo(sliceElemType) {
newElemValue = newElemValue.Convert(sliceElemType)
}
if !newElemValue.Type().AssignableTo(sliceElemType) {
panic("jet: can't append " + newElemValue.Type().String() + " to " + sliceValue.Type().String() + " slice")
}
sliceValue.Set(reflect.Append(sliceValue, newElemValue))
return nil
}
func newElemPtrValueForSlice(slicePtrValue reflect.Value) reflect.Value {
destinationSliceType := slicePtrValue.Type().Elem()
elemType := indirectType(destinationSliceType.Elem())
return reflect.New(elemType)
}
func getTypeName(structType reflect.Type, parentField *reflect.StructField) string {
if parentField == nil {
return structType.Name()
}
aliasTag := parentField.Tag.Get("alias")
if aliasTag == "" {
return structType.Name()
}
aliasParts := strings.Split(aliasTag, ".")
return toCommonIdentifier(aliasParts[0])
}
func getTypeAndFieldName(structType string, field reflect.StructField) (string, string) {
aliasTag := field.Tag.Get("alias")
if aliasTag == "" {
return structType, field.Name
}
aliasParts := strings.Split(aliasTag, ".")
if len(aliasParts) == 1 {
return structType, toCommonIdentifier(aliasParts[0])
}
return toCommonIdentifier(aliasParts[0]), toCommonIdentifier(aliasParts[1])
}
var replacer = strings.NewReplacer(" ", "", "-", "", "_", "")
func toCommonIdentifier(name string) string {
return strings.ToLower(replacer.Replace(name))
}
func initializeValueIfNilPtr(value reflect.Value) {
if !value.IsValid() || !value.CanSet() {
return
}
if value.Kind() == reflect.Ptr && value.IsNil() {
value.Set(reflect.New(value.Type().Elem()))
}
}
func valueToString(value reflect.Value) string {
if !value.IsValid() {
return "nil"
}
var valueInterface interface{}
if value.Kind() == reflect.Ptr {
if value.IsNil() {
return "nil"
}
valueInterface = value.Elem().Interface()
} else {
valueInterface = value.Interface()
}
if t, ok := valueInterface.(fmt.Stringer); ok {
return t.String()
}
return fmt.Sprintf("%#v", valueInterface)
}
var timeType = reflect.TypeOf(time.Now())
var uuidType = reflect.TypeOf(uuid.New())
var byteArrayType = reflect.TypeOf([]byte(""))
func isSimpleModelType(objType reflect.Type) bool {
objType = indirectType(objType)
switch objType.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
reflect.Float32, reflect.Float64,
reflect.String,
reflect.Bool:
return true
}
return objType == timeType || objType == uuidType || objType == byteArrayType
}
func isIntegerType(value reflect.Type) bool {
switch value {
case int8Type, unit8Type, int16Type, uint16Type,
int32Type, uint32Type, int64Type, uint64Type:
return true
}
return false
}
func tryAssign(source, destination reflect.Value) bool {
if source.Type().ConvertibleTo(destination.Type()) {
source = source.Convert(destination.Type())
}
if isIntegerType(source.Type()) && destination.Type() == boolType {
intValue := source.Int()
if intValue == 1 {
source = reflect.ValueOf(true)
} else if intValue == 0 {
source = reflect.ValueOf(false)
}
}
if source.Type().AssignableTo(destination.Type()) {
destination.Set(source)
return true
}
return false
}
func setReflectValue(source, destination reflect.Value) {
if tryAssign(source, destination) {
return
}
if destination.Kind() == reflect.Ptr {
if source.Kind() == reflect.Ptr {
if !source.IsNil() {
if destination.IsNil() {
initializeValueIfNilPtr(destination)
}
if tryAssign(source.Elem(), destination.Elem()) {
return
}
} else {
return
}
} else {
if source.CanAddr() {
source = source.Addr()
} else {
sourceCopy := reflect.New(source.Type())
sourceCopy.Elem().Set(source)
source = sourceCopy
}
if tryAssign(source, destination) {
return
}
if tryAssign(source.Elem(), destination.Elem()) {
return
}
}
} else {
if source.Kind() == reflect.Ptr {
if source.IsNil() {
return
}
source = source.Elem()
}
if tryAssign(source, destination) {
return
}
}
panic("jet: can't set " + source.Type().String() + " to " + destination.Type().String())
}
func createScanValue(columnTypes []*sql.ColumnType) []interface{} {
values := make([]interface{}, len(columnTypes))
for i, sqlColumnType := range columnTypes {
columnType := newScanType(sqlColumnType)
columnValue := reflect.New(columnType)
values[i] = columnValue.Interface()
}
return values
}
var boolType = reflect.TypeOf(true)
var int8Type = reflect.TypeOf(int8(1))
var unit8Type = reflect.TypeOf(uint8(1))
var int16Type = reflect.TypeOf(int16(1))
var uint16Type = reflect.TypeOf(uint16(1))
var int32Type = reflect.TypeOf(int32(1))
var uint32Type = reflect.TypeOf(uint32(1))
var int64Type = reflect.TypeOf(int64(1))
var uint64Type = reflect.TypeOf(uint64(1))
var nullBoolType = reflect.TypeOf(sql.NullBool{})
var nullInt8Type = reflect.TypeOf(internal.NullInt8{})
var nullInt16Type = reflect.TypeOf(internal.NullInt16{})
var nullInt32Type = reflect.TypeOf(internal.NullInt32{})
var nullInt64Type = reflect.TypeOf(sql.NullInt64{})
var nullFloat32Type = reflect.TypeOf(internal.NullFloat32{})
var nullFloat64Type = reflect.TypeOf(sql.NullFloat64{})
var nullStringType = reflect.TypeOf(sql.NullString{})
var nullTimeType = reflect.TypeOf(internal.NullTime{})
var nullByteArrayType = reflect.TypeOf(internal.NullByteArray{})
func newScanType(columnType *sql.ColumnType) reflect.Type {
switch columnType.DatabaseTypeName() {
case "TINYINT":
return nullInt8Type
case "INT2", "SMALLINT", "YEAR":
return nullInt16Type
case "INT4", "MEDIUMINT", "INT":
return nullInt32Type
case "INT8", "BIGINT":
return nullInt64Type
case "CHAR", "VARCHAR", "TEXT", "", "_TEXT", "TSVECTOR", "BPCHAR", "UUID", "JSON", "JSONB", "INTERVAL", "POINT", "BIT", "VARBIT", "XML":
return nullStringType
case "FLOAT4":
return nullFloat32Type
case "FLOAT8", "NUMERIC", "DECIMAL", "FLOAT", "DOUBLE":
return nullFloat64Type
case "BOOL":
return nullBoolType
case "BYTEA", "BINARY", "VARBINARY", "BLOB":
return nullByteArrayType
case "DATE", "DATETIME", "TIMESTAMP", "TIMESTAMPTZ", "TIME", "TIMETZ":
return nullTimeType
default:
return nullStringType
}
}
func isPrimaryKey(field reflect.StructField, primaryKeyOverwrites []string) bool {
if len(primaryKeyOverwrites) > 0 {
return utils.StringSliceContains(primaryKeyOverwrites, field.Name)
}
sqlTag := field.Tag.Get("sql")
return sqlTag == "primary_key"
}
func parentFieldPrimaryKeyOverwrite(parentField *reflect.StructField) []string {
if parentField == nil {
return nil
}
sqlTag := parentField.Tag.Get("sql")
if !strings.HasPrefix(sqlTag, "primary_key") {
return nil
}
parts := strings.Split(sqlTag, "=")
if len(parts) < 2 {
return nil
}
return strings.Split(parts[1], ",")
}
func indirectType(reflectType reflect.Type) reflect.Type {
if reflectType.Kind() != reflect.Ptr {
return reflectType
}
return reflectType.Elem()
}
func fieldToString(field *reflect.StructField) string {
if field == nil {
return ""
}
return " at '" + field.Name + " " + field.Type.String() + "'"
}