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package entity
import (
"encoding/json"
"strconv"
"strings"
"github.com/pkg/errors"
"github.com/MichaelMure/git-bug/repository"
"github.com/MichaelMure/git-bug/util/lamport"
)
const opsEntryName = "ops"
const versionEntryPrefix = "version-"
const createClockEntryPrefix = "create-clock-"
const editClockEntryPrefix = "edit-clock-"
type operationPack struct {
Operations []Operation
CreateTime lamport.Time
EditTime lamport.Time
}
// func (opp *operationPack) MarshalJSON() ([]byte, error) {
// return json.Marshal(struct {
// Operations []Operation `json:"ops"`
// }{
// Operations: opp.Operations,
// })
// }
func readOperationPack(def Definition, repo repository.RepoData, treeHash repository.Hash) (*operationPack, error) {
entries, err := repo.ReadTree(treeHash)
if err != nil {
return nil, err
}
// check the format version first, fail early instead of trying to read something
// var version uint
// for _, entry := range entries {
// if strings.HasPrefix(entry.Name, versionEntryPrefix) {
// v, err := strconv.ParseUint(strings.TrimPrefix(entry.Name, versionEntryPrefix), 10, 64)
// if err != nil {
// return nil, errors.Wrap(err, "can't read format version")
// }
// if v > 1<<12 {
// return nil, fmt.Errorf("format version too big")
// }
// version = uint(v)
// break
// }
// }
// if version == 0 {
// return nil, NewErrUnknowFormat(def.formatVersion)
// }
// if version != def.formatVersion {
// return nil, NewErrInvalidFormat(version, def.formatVersion)
// }
var ops []Operation
var createTime lamport.Time
var editTime lamport.Time
for _, entry := range entries {
if entry.Name == opsEntryName {
data, err := repo.ReadData(entry.Hash)
if err != nil {
return nil, errors.Wrap(err, "failed to read git blob data")
}
ops, err = unmarshallOperations(def, data)
if err != nil {
return nil, err
}
break
}
if strings.HasPrefix(entry.Name, createClockEntryPrefix) {
v, err := strconv.ParseUint(strings.TrimPrefix(entry.Name, createClockEntryPrefix), 10, 64)
if err != nil {
return nil, errors.Wrap(err, "can't read creation lamport time")
}
createTime = lamport.Time(v)
}
if strings.HasPrefix(entry.Name, editClockEntryPrefix) {
v, err := strconv.ParseUint(strings.TrimPrefix(entry.Name, editClockEntryPrefix), 10, 64)
if err != nil {
return nil, errors.Wrap(err, "can't read edit lamport time")
}
editTime = lamport.Time(v)
}
}
return &operationPack{
Operations: ops,
CreateTime: createTime,
EditTime: editTime,
}, nil
}
func unmarshallOperations(def Definition, data []byte) ([]Operation, error) {
aux := struct {
Operations []json.RawMessage `json:"ops"`
}{}
if err := json.Unmarshal(data, &aux); err != nil {
return nil, err
}
ops := make([]Operation, 0, len(aux.Operations))
for _, raw := range aux.Operations {
// delegate to specialized unmarshal function
op, err := def.operationUnmarshaler(raw)
if err != nil {
return nil, err
}
ops = append(ops, op)
}
return ops, nil
}
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