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to_kusto.go
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to_kusto.go
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package kusto
import (
"encoding/json"
"fmt"
"reflect"
"strings"
"time"
"github.com/andyliuliming/azure-kusto-go/kusto/data/table"
"github.com/andyliuliming/azure-kusto-go/kusto/data/types"
"github.com/andyliuliming/azure-kusto-go/kusto/data/value"
"github.com/google/uuid"
)
// structToKustoValues takes a *struct and encodes to value.Values. At least one column must get set.
func structToKustoValues(cols table.Columns, p interface{}) (value.Values, error) {
t := reflect.TypeOf(p).Elem()
v := reflect.ValueOf(p).Elem()
m := newColumnMap(cols)
row, err := defaultRow(cols)
if err != nil {
return nil, err
}
for i := 0; i < t.NumField(); i++ {
field := t.Field(i)
if tag := field.Tag.Get("kusto"); strings.TrimSpace(tag) != "" {
colData, ok := m[tag]
if !ok {
continue
}
if err := fieldConvert(colData, v.Field(i), row); err != nil {
return nil, err
}
} else {
colData, ok := m[field.Name]
if !ok {
continue
}
if err := fieldConvert(colData, v.Field(i), row); err != nil {
return nil, err
}
}
}
return row, nil
}
// fieldConvert will attempt to take the value held in v and convert it to the appropriate types.KustoValue
// that is described in colData in the correct location in row.
func fieldConvert(colData columnData, v reflect.Value, row value.Values) error {
switch colData.column.Type {
case types.Bool:
c, err := convertBool(v)
if err != nil {
return err
}
row[colData.position] = c
case types.DateTime:
c, err := convertDateTime(v)
if err != nil {
return err
}
row[colData.position] = c
case types.Dynamic:
c, err := convertDynamic(v)
if err != nil {
return err
}
row[colData.position] = c
case types.GUID:
c, err := convertGUID(v)
if err != nil {
return err
}
row[colData.position] = c
case types.Int:
c, err := convertInt(v)
if err != nil {
return err
}
row[colData.position] = c
case types.Long:
c, err := convertLong(v)
if err != nil {
return err
}
row[colData.position] = c
case types.Real:
c, err := convertReal(v)
if err != nil {
return err
}
row[colData.position] = c
case types.String:
c, err := convertString(v)
if err != nil {
return err
}
row[colData.position] = c
case types.Timespan:
c, err := convertTimespan(v)
if err != nil {
return err
}
row[colData.position] = c
case types.Decimal:
c, err := convertDecimal(v)
if err != nil {
return err
}
row[colData.position] = c
default:
return fmt.Errorf("column[%d] was for a column type that we don't understand(%s)", colData.position, colData.column.Type)
}
return nil
}
// defaultRow creates a complete row of KustoValues set to types outlined with cols. Useful for having
// default values for fields that are not set.
func defaultRow(cols table.Columns) (value.Values, error) {
var row = make(value.Values, len(cols))
for i, col := range cols {
switch col.Type {
case types.Bool:
row[i] = value.Bool{}
case types.DateTime:
row[i] = value.DateTime{}
case types.Dynamic:
row[i] = value.Dynamic{}
case types.GUID:
row[i] = value.GUID{}
case types.Int:
row[i] = value.Int{}
case types.Long:
row[i] = value.Long{}
case types.Real:
row[i] = value.Real{}
case types.String:
row[i] = value.String{}
case types.Timespan:
row[i] = value.Timespan{}
case types.Decimal:
row[i] = value.Decimal{}
default:
return nil, fmt.Errorf("column[%d] was for a column type that we don't understand(%s)", i, col.Type)
}
}
return row, nil
}
func colToValueCheck(cols table.Columns, values value.Values) error {
if len(cols) != len(values) {
return fmt.Errorf("the length of columns(%d) is not the same as the length of the row(%d)", len(cols), len(values))
}
for i, v := range values {
col := cols[i]
switch col.Type {
case types.Bool:
if reflect.TypeOf(v) != reflect.TypeOf(value.Bool{}) {
return fmt.Errorf("value[%d] was expected to be of a value.Bool, was %T", i, v)
}
case types.DateTime:
if reflect.TypeOf(v) != reflect.TypeOf(value.DateTime{}) {
return fmt.Errorf("value[%d] was expected to be of a value.DateTime, was %T", i, v)
}
case types.Dynamic:
if reflect.TypeOf(v) != reflect.TypeOf(value.Dynamic{}) {
return fmt.Errorf("value[%d] was expected to be of a value.Dynamic, was %T", i, v)
}
case types.GUID:
if reflect.TypeOf(v) != reflect.TypeOf(value.GUID{}) {
return fmt.Errorf("value[%d] was expected to be of a value.GUID, was %T", i, v)
}
case types.Int:
if reflect.TypeOf(v) != reflect.TypeOf(value.Int{}) {
return fmt.Errorf("value[%d] was expected to be of a value.Int, was %T", i, v)
}
case types.Long:
if reflect.TypeOf(v) != reflect.TypeOf(value.Long{}) {
return fmt.Errorf("value[%d] was expected to be of a value.Long, was %T", i, v)
}
case types.Real:
if reflect.TypeOf(v) != reflect.TypeOf(value.Real{}) {
return fmt.Errorf("value[%d] was expected to be of a value.Real, was %T", i, v)
}
case types.String:
if reflect.TypeOf(v) != reflect.TypeOf(value.String{}) {
return fmt.Errorf("value[%d] was expected to be of a value.String, was %T", i, v)
}
case types.Timespan:
if reflect.TypeOf(v) != reflect.TypeOf(value.Timespan{}) {
return fmt.Errorf("value[%d] was expected to be of a value.Timespan, was %T", i, v)
}
case types.Decimal:
if reflect.TypeOf(v) != reflect.TypeOf(value.Decimal{}) {
return fmt.Errorf("value[%d] was expected to be of a value.Decimal, was %T", i, v)
}
default:
return fmt.Errorf("value[%d] was for a column type that MockRow doesn't understand(%s)", i, col.Type)
}
}
return nil
}
func convertBool(v reflect.Value) (value.Bool, error) {
t := v.Type()
// If it is a pointer, dereference it.
if t.Kind() == reflect.Ptr {
t = t.Elem()
v = v.Elem()
}
// Was a value.Bool{}, so return it.
if t == reflect.TypeOf(value.Bool{}) {
return v.Interface().(value.Bool), nil
}
// Was a Bool, so return its value.
if t == reflect.TypeOf(true) {
return value.Bool{Value: v.Interface().(bool), Valid: true}, nil
}
return value.Bool{}, fmt.Errorf("value was expected to be either a value.Bool, *bool or bool, was %T", v.Interface())
}
func convertDateTime(v reflect.Value) (value.DateTime, error) {
t := v.Type()
// If it is a pointer, dereference it.
if t.Kind() == reflect.Ptr {
t = t.Elem()
v = v.Elem()
}
// Was a value.DateTime{}, so return it.
if t == reflect.TypeOf(value.DateTime{}) {
return v.Interface().(value.DateTime), nil
}
// Was a time.Time, so return its value.
if t == reflect.TypeOf(time.Time{}) {
return value.DateTime{Value: v.Interface().(time.Time), Valid: true}, nil
}
return value.DateTime{}, fmt.Errorf("value was expected to be either a value.DateTime, *time.Time or time.Time, was %T", v.Interface())
}
func convertTimespan(v reflect.Value) (value.Timespan, error) {
t := v.Type()
// If it is a pointer, dereference it.
if t.Kind() == reflect.Ptr {
t = t.Elem()
v = v.Elem()
}
// Was a value.Timespan{}, so return it.
if t == reflect.TypeOf(value.Timespan{}) {
return v.Interface().(value.Timespan), nil
}
// Was a time.Duration, so return its value.
if t == reflect.TypeOf(time.Second) {
return value.Timespan{Value: v.Interface().(time.Duration), Valid: true}, nil
}
return value.Timespan{}, fmt.Errorf("value was expected to be either a value.Timespan, *time.Duration or time.Duration, was %T", v.Interface())
}
func convertDynamic(v reflect.Value) (value.Dynamic, error) {
t := v.Type()
// If it is a pointer, dereference it.
if t.Kind() == reflect.Ptr {
t = t.Elem()
v = v.Elem()
}
// Was a value.Dynamic{}, so return it.
if t == reflect.TypeOf(value.Dynamic{}) {
return v.Interface().(value.Dynamic), nil
}
// Was a string, so return it as []byte.
if t == reflect.TypeOf("") {
return value.Dynamic{Value: []byte(v.Interface().(string)), Valid: true}, nil
}
// Was a []byte, so return it.
if t == reflect.TypeOf([]byte{}) {
return value.Dynamic{Value: v.Interface().([]byte), Valid: true}, nil
}
// Anything else, try to marshal it.
b, err := json.Marshal(v.Interface())
if err != nil {
return value.Dynamic{}, fmt.Errorf("the type *%T used in a value.Dynamic could not be JSON encoded: %s", v.Interface(), err)
}
return value.Dynamic{Value: b, Valid: true}, nil
}
func convertGUID(v reflect.Value) (value.GUID, error) {
t := v.Type()
// If it is a pointer, dereference it.
if t.Kind() == reflect.Ptr {
t = t.Elem()
v = v.Elem()
}
// Was a value.GUID{}, so return it.
if t == reflect.TypeOf(value.GUID{}) {
return v.Interface().(value.GUID), nil
}
// Was a uuid.UUID, so return its value.
if t == reflect.TypeOf(uuid.UUID{}) {
return value.GUID{Value: v.Interface().(uuid.UUID), Valid: true}, nil
}
return value.GUID{}, fmt.Errorf("value was expected to be either a value.BUID, *uuid.UUID or uuid.UUID, was %T", v.Interface())
}
func convertInt(v reflect.Value) (value.Int, error) {
t := v.Type()
// If it is a pointer, dereference it.
if t.Kind() == reflect.Ptr {
t = t.Elem()
v = v.Elem()
}
// Was a value.Int{}, so return it.
if t == reflect.TypeOf(value.Int{}) {
return v.Interface().(value.Int), nil
}
// Was a int32, so return its value.
if t == reflect.TypeOf(int32(1)) {
return value.Int{Value: v.Interface().(int32), Valid: true}, nil
}
return value.Int{}, fmt.Errorf("value was expected to be either a value.Int, *int32 or int32, was %T", v.Interface())
}
func convertLong(v reflect.Value) (value.Long, error) {
t := v.Type()
// If it is a pointer, dereference it.
if t.Kind() == reflect.Ptr {
t = t.Elem()
v = v.Elem()
}
// Was a value.Long{}, so return it.
if t == reflect.TypeOf(value.Long{}) {
return v.Interface().(value.Long), nil
}
// Was a int64, so return its value.
if t == reflect.TypeOf(int64(1)) {
return value.Long{Value: v.Interface().(int64), Valid: true}, nil
}
return value.Long{}, fmt.Errorf("value was expected to be either a value.Long, *int64 or int64, was %T", v.Interface())
}
func convertReal(v reflect.Value) (value.Real, error) {
t := v.Type()
// If it is a pointer, dereference it.
if t.Kind() == reflect.Ptr {
t = t.Elem()
v = v.Elem()
}
// Was a value.Real{}, so return it.
if t == reflect.TypeOf(value.Real{}) {
return v.Interface().(value.Real), nil
}
// Was a float64, so return its value.
if t == reflect.TypeOf(float64(1.0)) {
return value.Real{Value: v.Interface().(float64), Valid: true}, nil
}
return value.Real{}, fmt.Errorf("value was expected to be either a value.Real, *float64 or float64, was %T", v.Interface())
}
func convertString(v reflect.Value) (value.String, error) {
t := v.Type()
// If it is a pointer, dereference it.
if t.Kind() == reflect.Ptr {
t = t.Elem()
v = v.Elem()
}
// Was a types.String{}, so return it.
if t == reflect.TypeOf(value.String{}) {
return v.Interface().(value.String), nil
}
// Was a string, so return its value.
if t == reflect.TypeOf("") {
return value.String{Value: v.Interface().(string), Valid: true}, nil
}
return value.String{}, fmt.Errorf("value was expected to be either a types.String, *string or string, was %T", v.Interface())
}
func convertDecimal(v reflect.Value) (value.Decimal, error) {
t := v.Type()
// If it is a pointer, dereference it.
if t.Kind() == reflect.Ptr {
t = t.Elem()
v = v.Elem()
}
// Was a types.Decimal{}, so return it.
if t == reflect.TypeOf(value.Decimal{}) {
return v.Interface().(value.Decimal), nil
}
// Was a string, so return its value.
if t == reflect.TypeOf("") {
return value.Decimal{Value: v.Interface().(string), Valid: true}, nil
}
return value.Decimal{}, fmt.Errorf("value was expected to be either a types.Decimal, *string or string, was %T", v.Interface())
}