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Copy pathdecoder.go
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413 lines (394 loc) · 9.74 KB
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//
// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package main
import (
"encoding/base64"
"fmt"
"strings"
"time"
"cloud.google.com/go/spanner"
sppb "cloud.google.com/go/spanner/apiv1/spannerpb"
)
func DecodeRow(row *spanner.Row) ([]string, error) {
columns := make([]string, row.Size())
for i := 0; i < row.Size(); i++ {
var column spanner.GenericColumnValue
if err := row.Column(i, &column); err != nil {
return nil, err
}
decoded, err := DecodeColumn(column)
if err != nil {
return nil, err
}
columns[i] = decoded
}
return columns, nil
}
func DecodeColumn(column spanner.GenericColumnValue) (string, error) {
// Allowable types: https://cloud.google.com/spanner/docs/data-types#allowable-types
switch column.Type.Code {
case sppb.TypeCode_ARRAY:
var decoded []string
switch column.Type.GetArrayElementType().Code {
case sppb.TypeCode_BOOL:
var vs []spanner.NullBool
if err := column.Decode(&vs); err != nil {
return "", err
}
if vs == nil {
return "NULL", nil
}
for _, v := range vs {
decoded = append(decoded, nullBoolToString(v))
}
case sppb.TypeCode_BYTES, sppb.TypeCode_PROTO:
var vs [][]byte
if err := column.Decode(&vs); err != nil {
return "", err
}
if vs == nil {
return "NULL", nil
}
for _, v := range vs {
decoded = append(decoded, nullBytesToString(v))
}
case sppb.TypeCode_FLOAT32:
var vs []spanner.NullFloat32
if err := column.Decode(&vs); err != nil {
return "", err
}
if vs == nil {
return "NULL", nil
}
for _, v := range vs {
decoded = append(decoded, nullFloat32ToString(v))
}
case sppb.TypeCode_FLOAT64:
var vs []spanner.NullFloat64
if err := column.Decode(&vs); err != nil {
return "", err
}
if vs == nil {
return "NULL", nil
}
for _, v := range vs {
decoded = append(decoded, nullFloat64ToString(v))
}
case sppb.TypeCode_INT64, sppb.TypeCode_ENUM:
var vs []spanner.NullInt64
if err := column.Decode(&vs); err != nil {
return "", err
}
if vs == nil {
return "NULL", nil
}
for _, v := range vs {
decoded = append(decoded, nullInt64ToString(v))
}
case sppb.TypeCode_NUMERIC:
var vs []spanner.NullNumeric
if err := column.Decode(&vs); err != nil {
return "", err
}
if vs == nil {
return "NULL", nil
}
for _, v := range vs {
decoded = append(decoded, nullNumericToString(v))
}
case sppb.TypeCode_STRING:
var vs []spanner.NullString
if err := column.Decode(&vs); err != nil {
return "", err
}
if vs == nil {
return "NULL", nil
}
for _, v := range vs {
decoded = append(decoded, nullStringToString(v))
}
case sppb.TypeCode_TIMESTAMP:
var vs []spanner.NullTime
if err := column.Decode(&vs); err != nil {
return "", err
}
if vs == nil {
return "NULL", nil
}
for _, v := range vs {
decoded = append(decoded, nullTimeToString(v))
}
case sppb.TypeCode_DATE:
var vs []spanner.NullDate
if err := column.Decode(&vs); err != nil {
return "", err
}
if vs == nil {
return "NULL", nil
}
for _, v := range vs {
decoded = append(decoded, nullDateToString(v))
}
case sppb.TypeCode_STRUCT:
// STRUCT is only allowed in an ARRAY
// https://cloud.google.com/spanner/docs/structs#returning_struct_objects_in_sql_query_results
var vs []spanner.NullRow
if err := column.Decode(&vs); err != nil {
return "", err
}
if vs == nil {
return "NULL", nil
}
for _, v := range vs {
columns, err := DecodeRow(&v.Row)
if err != nil {
return "", err
}
decoded = append(decoded, fmt.Sprintf("[%s]", strings.Join(columns, ", ")))
}
case sppb.TypeCode_JSON:
var vs []spanner.NullJSON
if err := column.Decode(&vs); err != nil {
return "", err
}
if vs == nil {
return "NULL", nil
}
for _, v := range vs {
decoded = append(decoded, nullJSONToString(v))
}
case sppb.TypeCode_INTERVAL:
var vs []spanner.NullInterval
if err := column.Decode(&vs); err != nil {
return "", err
}
if vs == nil {
return "NULL", nil
}
for _, v := range vs {
decoded = append(decoded, nullIntervalToString(v))
}
case sppb.TypeCode_UUID:
var vs []spanner.NullUUID
if err := column.Decode(&vs); err != nil {
return "", err
}
if vs == nil {
return "NULL", nil
}
for _, v := range vs {
decoded = append(decoded, nullUUIDToString(v))
}
}
return fmt.Sprintf("[%s]", strings.Join(decoded, ", ")), nil
case sppb.TypeCode_BOOL:
var v spanner.NullBool
if err := column.Decode(&v); err != nil {
return "", err
}
return nullBoolToString(v), nil
case sppb.TypeCode_BYTES, sppb.TypeCode_PROTO:
var v []byte
if err := column.Decode(&v); err != nil {
return "", err
}
return nullBytesToString(v), nil
case sppb.TypeCode_FLOAT32:
var v spanner.NullFloat32
if err := column.Decode(&v); err != nil {
return "", err
}
return nullFloat32ToString(v), nil
case sppb.TypeCode_FLOAT64:
var v spanner.NullFloat64
if err := column.Decode(&v); err != nil {
return "", err
}
return nullFloat64ToString(v), nil
case sppb.TypeCode_INT64, sppb.TypeCode_ENUM:
var v spanner.NullInt64
if err := column.Decode(&v); err != nil {
return "", err
}
return nullInt64ToString(v), nil
case sppb.TypeCode_NUMERIC:
var v spanner.NullNumeric
if err := column.Decode(&v); err != nil {
return "", err
}
return nullNumericToString(v), nil
case sppb.TypeCode_STRING:
var v spanner.NullString
if err := column.Decode(&v); err != nil {
return "", err
}
return nullStringToString(v), nil
case sppb.TypeCode_TIMESTAMP:
var v spanner.NullTime
if err := column.Decode(&v); err != nil {
return "", err
}
return nullTimeToString(v), nil
case sppb.TypeCode_DATE:
var v spanner.NullDate
if err := column.Decode(&v); err != nil {
return "", err
}
return nullDateToString(v), nil
case sppb.TypeCode_JSON:
var v spanner.NullJSON
if err := column.Decode(&v); err != nil {
return "", err
}
return nullJSONToString(v), nil
case sppb.TypeCode_INTERVAL:
var v spanner.NullInterval
if err := column.Decode(&v); err != nil {
return "", err
}
return nullIntervalToString(v), nil
case sppb.TypeCode_UUID:
var v spanner.NullUUID
if err := column.Decode(&v); err != nil {
return "", err
}
return nullUUIDToString(v), nil
default:
return fmt.Sprintf("%s", column.Value), nil
}
}
func nullBoolToString(v spanner.NullBool) string {
if v.Valid {
return fmt.Sprintf("%t", v.Bool)
} else {
return "NULL"
}
}
func nullBytesToString(v []byte) string {
if v != nil {
return base64.StdEncoding.EncodeToString(v)
} else {
return "NULL"
}
}
func nullFloat32ToString(v spanner.NullFloat32) string {
if v.Valid {
return fmt.Sprintf("%f", v.Float32)
} else {
return "NULL"
}
}
func nullFloat64ToString(v spanner.NullFloat64) string {
if v.Valid {
return fmt.Sprintf("%f", v.Float64)
} else {
return "NULL"
}
}
func nullInt64ToString(v spanner.NullInt64) string {
if v.Valid {
return fmt.Sprintf("%d", v.Int64)
} else {
return "NULL"
}
}
func nullNumericToString(v spanner.NullNumeric) string {
if v.Valid {
s := v.Numeric.FloatString(spanner.NumericScaleDigits)
s = strings.TrimRight(s, "0") // trim trailing 0: 123.000000000 => 123.
return strings.TrimSuffix(s, ".") // trim unused dot: 123. => 123
} else {
return "NULL"
}
}
func nullStringToString(v spanner.NullString) string {
if v.Valid {
return v.StringVal
} else {
return "NULL"
}
}
func nullTimeToString(v spanner.NullTime) string {
if v.Valid {
return fmt.Sprintf("%s", v.Time.Format(time.RFC3339Nano))
} else {
return "NULL"
}
}
func nullDateToString(v spanner.NullDate) string {
if v.Valid {
return strings.Trim(v.String(), `"`)
} else {
return "NULL"
}
}
func nullJSONToString(v spanner.NullJSON) string {
if v.Valid {
return v.String()
} else {
return "NULL"
}
}
func nullIntervalToString(v spanner.NullInterval) string {
if v.Valid {
return v.String()
} else {
return "NULL"
}
}
func nullUUIDToString(v spanner.NullUUID) string {
if v.Valid {
return v.String()
} else {
return "NULL"
}
}
func formatTypeSimple(typ *sppb.Type) string {
switch code := typ.GetCode(); code {
case sppb.TypeCode_ARRAY:
return fmt.Sprintf("ARRAY<%v>", formatTypeSimple(typ.GetArrayElementType()))
default:
if name, ok := sppb.TypeCode_name[int32(code)]; ok {
return name
} else {
return "UNKNOWN"
}
}
}
func formatTypeVerbose(typ *sppb.Type) string {
switch code := typ.GetCode(); code {
case sppb.TypeCode_ARRAY:
return fmt.Sprintf("ARRAY<%v>", formatTypeVerbose(typ.GetArrayElementType()))
case sppb.TypeCode_ENUM, sppb.TypeCode_PROTO:
return typ.GetProtoTypeFqn()
case sppb.TypeCode_STRUCT:
var structTypeStrs []string
for _, v := range typ.GetStructType().GetFields() {
if v.GetName() != "" {
structTypeStrs = append(structTypeStrs, fmt.Sprintf("%v %v", v.GetName(), formatTypeVerbose(v.GetType())))
} else {
structTypeStrs = append(structTypeStrs, fmt.Sprintf("%v", formatTypeVerbose(v.GetType())))
}
}
return fmt.Sprintf("STRUCT<%v>", strings.Join(structTypeStrs, ", "))
default:
if name, ok := sppb.TypeCode_name[int32(code)]; ok {
return name
} else {
return "UNKNOWN"
}
}
}