// GetBlock retrieves a particular block from the service,
// Getting it from the datastore using the key (hash).
func (s *BlockService) GetBlock(ctx context.Context, k u.Key) (*blocks.Block, error) {
log.Debugf("BlockService GetBlock: '%s'", k)
datai, err := s.Datastore.Get(k.DsKey())
if err == nil {
log.Debug("Blockservice: Got data in datastore.")
bdata, ok := datai.([]byte)
if !ok {
return nil, fmt.Errorf("data associated with %s is not a []byte", k)
}
return &blocks.Block{
Multihash: mh.Multihash(k),
Data: bdata,
}, nil
} else if err == ds.ErrNotFound && s.Remote != nil {
log.Debug("Blockservice: Searching bitswap.")
blk, err := s.Remote.Block(ctx, k)
if err != nil {
return nil, err
}
return blk, nil
} else {
log.Debug("Blockservice GetBlock: Not found.")
return nil, ErrNotFound
}
}
// getLocal attempts to retrieve the value from the datastore
func (dht *IpfsDHT) getLocal(key u.Key) ([]byte, error) {
dht.dslock.Lock()
defer dht.dslock.Unlock()
log.Debug("getLocal %s", key)
v, err := dht.datastore.Get(key.DsKey())
if err != nil {
return nil, err
}
log.Debug("found in db")
byt, ok := v.([]byte)
if !ok {
return nil, errors.New("value stored in datastore not []byte")
}
rec := new(pb.Record)
err = proto.Unmarshal(byt, rec)
if err != nil {
return nil, err
}
// TODO: 'if paranoid'
if u.Debug {
err = dht.verifyRecord(rec)
if err != nil {
log.Errorf("local record verify failed: %s", err)
return nil, err
}
}
return rec.GetValue(), nil
}
func (d *datastoreBlockSet) AddBlock(k util.Key) {
err := d.dstore.Put(k.DsKey(), []byte{})
if err != nil {
log.Errorf("blockset put error: %s", err)
}
d.bset.AddBlock(k)
}
func (bs *blockstore) Get(k u.Key) (*blocks.Block, error) {
maybeData, err := bs.datastore.Get(k.DsKey())
if err != nil {
return nil, err
}
bdata, ok := maybeData.([]byte)
if !ok {
return nil, ValueTypeMismatch
}
return blocks.NewBlockWithHash(bdata, mh.Multihash(k))
}
// putLocal stores the key value pair in the datastore
func (dht *IpfsDHT) putLocal(key u.Key, value []byte) error {
rec, err := dht.makePutRecord(key, value)
if err != nil {
return err
}
data, err := proto.Marshal(rec)
if err != nil {
return err
}
return dht.datastore.Put(key.DsKey(), data)
}
func (mr *MockRouter) GetValue(ctx context.Context, key u.Key) ([]byte, error) {
log.Debugf("GetValue: %s", key)
v, err := mr.datastore.Get(key.DsKey())
if err != nil {
return nil, err
}
data, ok := v.([]byte)
if !ok {
return nil, errors.New("could not cast value from datastore")
}
return data, nil
}
func (d *datastoreBlockSet) RemoveBlock(k util.Key) {
d.bset.RemoveBlock(k)
if !d.bset.HasKey(k) {
d.dstore.Delete(k.DsKey())
}
}
func (mr *MockRouter) PutValue(ctx context.Context, key u.Key, val []byte) error {
log.Debugf("PutValue: %s", key)
return mr.datastore.Put(key.DsKey(), val)
}
// DeleteBlock deletes a block in the blockservice from the datastore
func (s *BlockService) DeleteBlock(k u.Key) error {
return s.Datastore.Delete(k.DsKey())
}