// GetOrCreateTimestamp returns the current timestamp for the gun. This may mean
// a new timestamp is generated either because none exists, or because the current
// one has expired. Once generated, the timestamp is saved in the store.
func GetOrCreateTimestamp(gun string, store storage.MetaStore, cryptoService signed.CryptoService) ([]byte, error) {
snapshot, err := store.GetCurrent(gun, "snapshot")
if err != nil {
return nil, err
}
d, err := store.GetCurrent(gun, "timestamp")
if err != nil {
if _, ok := err.(*storage.ErrNotFound); !ok {
logrus.Error("error retrieving timestamp: ", err.Error())
return nil, err
}
logrus.Debug("No timestamp found, will proceed to create first timestamp")
}
ts := &data.SignedTimestamp{}
if d != nil {
err := json.Unmarshal(d, ts)
if err != nil {
logrus.Error("Failed to unmarshal existing timestamp")
return nil, err
}
if !timestampExpired(ts) && !snapshotExpired(ts, snapshot) {
return d, nil
}
}
sgnd, version, err := CreateTimestamp(gun, ts, snapshot, store, cryptoService)
if err != nil {
logrus.Error("Failed to create a new timestamp")
return nil, err
}
out, err := json.Marshal(sgnd)
if err != nil {
logrus.Error("Failed to marshal new timestamp")
return nil, err
}
err = store.UpdateCurrent(gun, storage.MetaUpdate{Role: "timestamp", Version: version, Data: out})
if err != nil {
return nil, err
}
return out, nil
}
// GetOrCreateTimestamp returns the current timestamp for the gun. This may mean
// a new timestamp is generated either because none exists, or because the current
// one has expired. Once generated, the timestamp is saved in the store.
func GetOrCreateTimestamp(gun string, store storage.MetaStore, cryptoService signed.CryptoService) ([]byte, error) {
d, err := store.GetCurrent(gun, "timestamp")
if err != nil {
if _, ok := err.(*storage.ErrNotFound); !ok {
// If we received an ErrNotFound, we're going to
// generate the first timestamp, any other error
// should be returned here
return nil, err
}
}
ts := &data.SignedTimestamp{}
if d != nil {
err := json.Unmarshal(d, ts)
if err != nil {
logrus.Error("Failed to unmarshal existing timestamp")
return nil, err
}
if !timestampExpired(ts) {
return d, nil
}
}
sgnd, version, err := createTimestamp(gun, ts, store, cryptoService)
if err != nil {
logrus.Error("Failed to create a new timestamp")
return nil, err
}
out, err := json.Marshal(sgnd)
if err != nil {
logrus.Error("Failed to marshal new timestamp")
return nil, err
}
err = store.UpdateCurrent(gun, storage.MetaUpdate{Role: "timestamp", Version: version, Data: out})
if err != nil {
return nil, err
}
return out, nil
}
// GetOrCreateSnapshot either returns the exisiting latest snapshot, or uses
// whatever the most recent snapshot is to create the next one, only updating
// the expiry time and version.
func GetOrCreateSnapshot(gun string, store storage.MetaStore, cryptoService signed.CryptoService) ([]byte, error) {
d, err := store.GetCurrent(gun, "snapshot")
if err != nil {
return nil, err
}
sn := &data.SignedSnapshot{}
if d != nil {
err := json.Unmarshal(d, sn)
if err != nil {
logrus.Error("Failed to unmarshal existing snapshot")
return nil, err
}
if !snapshotExpired(sn) {
return d, nil
}
}
sgnd, version, err := createSnapshot(gun, sn, store, cryptoService)
if err != nil {
logrus.Error("Failed to create a new snapshot")
return nil, err
}
out, err := json.Marshal(sgnd)
if err != nil {
logrus.Error("Failed to marshal new snapshot")
return nil, err
}
err = store.UpdateCurrent(gun, storage.MetaUpdate{Role: "snapshot", Version: version, Data: out})
if err != nil {
return nil, err
}
return out, nil
}
