util.go

package gosql

import (
	"reflect"
	"sort"
	"time"
)

//inSlice
func inSlice(k string, s []string) bool {
	for _, v := range s {
		if k == v {
			return true
		}
	}
	return false
}

//IsZero assert value is zero value
func IsZero(val reflect.Value) bool {
	if !val.IsValid() {
		return true
	}

	kind := val.Kind()
	switch kind {
	case reflect.String:
		return val.Len() == 0
	case reflect.Bool:
		return val.Bool() == false
	case reflect.Float32, reflect.Float64:
		return val.Float() == 0.0
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		return val.Int() == 0
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
		return val.Uint() == 0
	case reflect.Ptr, reflect.Chan, reflect.Func, reflect.Interface, reflect.Slice, reflect.Map:
		return val.IsNil()
	case reflect.Array:
		for i := 0; i < val.Len(); i++ {
			if !IsZero(val.Index(i)) {
				return false
			}
		}
		return true
	case reflect.Struct:
		if t, ok := val.Interface().(time.Time); ok {
			return t.IsZero()
		} else {
			valid := val.FieldByName("Valid")
			if valid.IsValid() {
				va, ok := valid.Interface().(bool)
				return ok && !va
			}

			return reflect.DeepEqual(val.Interface(), reflect.Zero(val.Type()).Interface())
		}
	default:
		return reflect.DeepEqual(val.Interface(), reflect.Zero(val.Type()).Interface())
	}
}

//zeroValueFilter filter zero value and keep the specified zero value
func zeroValueFilter(fields map[string]reflect.Value, zv []string) map[string]interface{} {
	m := make(map[string]interface{})

	for k, v := range fields {
		v = reflect.Indirect(v)
		if inSlice(k, zv) || !IsZero(v) {
			m[k] = v.Interface()
		}
	}

	return m
}

// structAutoTime  auto set created_at updated_at
func structAutoTime(fields map[string]reflect.Value, f []string) {
	for k, v := range fields {
		v = reflect.Indirect(v)
		if v.IsValid() && inSlice(k, f) && IsZero(v) {
			switch v.Kind() {
			case reflect.String:
				v.SetString(time.Now().Format("2006-01-02 15:04:05"))
			case reflect.Struct:
				v.Set(reflect.ValueOf(time.Now()))
			}
		}
	}
}

// structToMap
func structToMap(fields map[string]reflect.Value) map[string]interface{} {
	m := make(map[string]interface{})
	for k, v := range fields {
		v = reflect.Indirect(v)
		m[k] = v.Interface()
	}
	return m
}

// sortedParamKeys Sorts the param names given - map iteration order is explicitly random in Go
// but we need params in a defined order to avoid unexpected results.
func sortedParamKeys(params map[string]interface{}) []string {
	sortedKeys := make([]string, len(params))
	i := 0
	for k := range params {
		sortedKeys[i] = k
		i++
	}
	sort.Strings(sortedKeys)

	return sortedKeys
}