/
json.go
197 lines (176 loc) · 4.74 KB
/
json.go
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package utils
import (
"encoding/hex"
"encoding/json"
"github.com/pingcap/errors"
backuppb "github.com/pingcap/kvproto/pkg/brpb"
)
// MarshalBackupMeta converts the backupmeta strcture to JSON.
// Unlike json.Marshal, this function also format some []byte fields for human reading.
func MarshalBackupMeta(meta *backuppb.BackupMeta) ([]byte, error) {
result, err := makeJSONBackupMeta(meta)
if err != nil {
return nil, err
}
return json.Marshal(result)
}
// UnmarshalBackupMeta converts the prettied JSON format of backupmeta
// (made by MarshalBackupMeta) back to the go structure.
func UnmarshalBackupMeta(data []byte) (*backuppb.BackupMeta, error) {
jMeta := &jsonBackupMeta{}
if err := json.Unmarshal(data, jMeta); err != nil {
return nil, errors.Trace(err)
}
return fromJSONBackupMeta(jMeta)
}
type jsonValue interface{}
type jsonFile struct {
SHA256 string `json:"sha256,omitempty"`
StartKey string `json:"start_key,omitempty"`
EndKey string `json:"end_key,omitempty"`
*backuppb.File
}
func makeJSONFile(file *backuppb.File) *jsonFile {
return &jsonFile{
SHA256: hex.EncodeToString(file.Sha256),
StartKey: hex.EncodeToString(file.StartKey),
EndKey: hex.EncodeToString(file.EndKey),
File: file,
}
}
func fromJSONFile(jFile *jsonFile) (*backuppb.File, error) {
f := jFile.File
var err error
f.Sha256, err = hex.DecodeString(jFile.SHA256)
if err != nil {
return nil, errors.Trace(err)
}
f.StartKey, err = hex.DecodeString(jFile.StartKey)
if err != nil {
return nil, errors.Trace(err)
}
f.EndKey, err = hex.DecodeString(jFile.EndKey)
if err != nil {
return nil, errors.Trace(err)
}
return f, nil
}
type jsonRawRange struct {
StartKey string `json:"start_key,omitempty"`
EndKey string `json:"end_key,omitempty"`
*backuppb.RawRange
}
func makeJSONRawRange(raw *backuppb.RawRange) *jsonRawRange {
return &jsonRawRange{
StartKey: hex.EncodeToString(raw.StartKey),
EndKey: hex.EncodeToString(raw.EndKey),
RawRange: raw,
}
}
func fromJSONRawRange(rng *jsonRawRange) (*backuppb.RawRange, error) {
r := rng.RawRange
var err error
r.StartKey, err = hex.DecodeString(rng.StartKey)
if err != nil {
return nil, errors.Trace(err)
}
r.EndKey, err = hex.DecodeString(rng.EndKey)
if err != nil {
return nil, errors.Trace(err)
}
return r, nil
}
type jsonSchema struct {
Table jsonValue `json:"table,omitempty"`
DB jsonValue `json:"db,omitempty"`
*backuppb.Schema
}
func makeJSONSchema(schema *backuppb.Schema) (*jsonSchema, error) {
result := &jsonSchema{Schema: schema}
if err := json.Unmarshal(schema.Db, &result.DB); err != nil {
return nil, errors.Trace(err)
}
if schema.Table != nil {
if err := json.Unmarshal(schema.Table, &result.Table); err != nil {
return nil, errors.Trace(err)
}
}
return result, nil
}
func fromJSONSchema(jSchema *jsonSchema) (*backuppb.Schema, error) {
schema := jSchema.Schema
if schema == nil {
schema = &backuppb.Schema{}
}
var err error
schema.Db, err = json.Marshal(jSchema.DB)
if err != nil {
return nil, errors.Trace(err)
}
if jSchema.Table != nil {
schema.Table, err = json.Marshal(jSchema.Table)
if err != nil {
return nil, errors.Trace(err)
}
}
return schema, nil
}
type jsonBackupMeta struct {
Files []*jsonFile `json:"files,omitempty"`
RawRanges []*jsonRawRange `json:"raw_ranges,omitempty"`
Schemas []*jsonSchema `json:"schemas,omitempty"`
DDLs jsonValue `json:"ddls,omitempty"`
*backuppb.BackupMeta
}
func makeJSONBackupMeta(meta *backuppb.BackupMeta) (*jsonBackupMeta, error) {
result := &jsonBackupMeta{
BackupMeta: meta,
}
for _, file := range meta.Files {
result.Files = append(result.Files, makeJSONFile(file))
}
for _, rawRange := range meta.RawRanges {
result.RawRanges = append(result.RawRanges, makeJSONRawRange(rawRange))
}
for _, schema := range meta.Schemas {
s, err := makeJSONSchema(schema)
if err != nil {
return nil, err
}
result.Schemas = append(result.Schemas, s)
}
if err := json.Unmarshal(meta.Ddls, &result.DDLs); err != nil {
return nil, errors.Trace(err)
}
return result, nil
}
func fromJSONBackupMeta(jMeta *jsonBackupMeta) (*backuppb.BackupMeta, error) {
meta := jMeta.BackupMeta
for _, schema := range jMeta.Schemas {
s, err := fromJSONSchema(schema)
if err != nil {
return nil, err
}
meta.Schemas = append(meta.Schemas, s)
}
for _, file := range jMeta.Files {
f, err := fromJSONFile(file)
if err != nil {
return nil, err
}
meta.Files = append(meta.Files, f)
}
for _, rawRange := range jMeta.RawRanges {
rng, err := fromJSONRawRange(rawRange)
if err != nil {
return nil, err
}
meta.RawRanges = append(meta.RawRanges, rng)
}
var err error
meta.Ddls, err = json.Marshal(jMeta.DDLs)
if err != nil {
return nil, errors.Trace(err)
}
return meta, nil
}