// FindGatewayByAppID returns CloudAddress for the gateway which matches with specified AppID
func (m *DB) FindGatewayByAppID(appID string) (common.CloudAddress, error) {
var caddr *common.CloudAddress
err := m.db.View(func(tx *bolt.Tx) (err error) {
gateway := tx.Bucket([]byte(boltGatewayBucket))
b := gateway.Get([]byte(appID))
if b == nil {
return common.ErrUnknownGateway
}
caddr, err = common.ParseCloudAddress(string(b))
if err != nil {
return err
}
return nil
})
if err != nil {
return common.CloudAddress{}, err
}
return *caddr, nil
}
// unmarshalMapItem deserializes into a common.MapItem (using JSON).
func (m *DB) unmarshalMapItem(b []byte) (common.MapItem, error) {
var v mapItemJSON
err := json.Unmarshal(b, &v)
if err != nil {
return common.MapItem{}, err
}
item := common.MapItem{States: v.State, ThingProperties: v.ThingProperties}
if v.EndnodeID != nil {
item.EndnodeAddress, err = common.ParseEndnodeAddress(*v.EndnodeID)
if err != nil {
return common.MapItem{}, err
}
}
if v.CloudID != nil {
item.CloudAddress, err = common.ParseCloudAddress(*v.CloudID)
if err != nil {
return common.MapItem{}, err
}
}
return item, nil
}
// InsertGateway inserts CloudAddress for the gateway
func (m *DB) InsertGateway(appID string, f common.OnboardGatewayFunc) (common.CloudAddress, error) {
var pcaddr *common.CloudAddress
// return stored common.CloudAddress if exists.
err := m.db.View(func(tx *bolt.Tx) (err error) {
gateway := tx.Bucket([]byte(boltGatewayBucket))
b := gateway.Get([]byte(appID))
if b != nil {
p, err := common.ParseCloudAddress(string(b))
if err != nil {
return err
}
pcaddr = p
return nil
}
return nil
})
if err != nil {
return common.CloudAddress{}, err
} else if pcaddr != nil {
return *pcaddr, nil
}
// otherwise onboard to retrieve new CloudAddress.
caddr, err := f(appID)
if err != nil {
return common.CloudAddress{}, err
}
err = m.db.Update(func(tx *bolt.Tx) error {
gateway := tx.Bucket([]byte(boltGatewayBucket))
err = gateway.Put([]byte(caddr.AppID), []byte(caddr.IDString()))
if err != nil {
return err
}
return nil
})
if err != nil {
return common.CloudAddress{}, err
}
return caddr, nil
}