// handleGetBlock implements the getblock command.
func handleGetBlock(s *rpcServer, cmd btcjson.Cmd) (interface{}, error) {
c := cmd.(*btcjson.GetBlockCmd)
sha, err := btcwire.NewShaHashFromStr(c.Hash)
if err != nil {
rpcsLog.Errorf("Error generating sha: %v", err)
return nil, btcjson.ErrBlockNotFound
}
blk, err := s.server.db.FetchBlockBySha(sha)
if err != nil {
rpcsLog.Errorf("Error fetching sha: %v", err)
return nil, btcjson.ErrBlockNotFound
}
// When the verbose flag isn't set, simply return the network-serialized
// block as a hex-encoded string.
if !c.Verbose {
blkHex, err := messageToHex(blk.MsgBlock())
if err != nil {
return nil, err
}
return blkHex, nil
}
// The verbose flag is set, so generate the JSON object and return it.
buf, err := blk.Bytes()
if err != nil {
rpcsLog.Errorf("Error fetching block: %v", err)
return nil, btcjson.Error{
Code: btcjson.ErrInternal.Code,
Message: err.Error(),
}
}
idx := blk.Height()
_, maxidx, err := s.server.db.NewestSha()
if err != nil {
rpcsLog.Errorf("Cannot get newest sha: %v", err)
return nil, btcjson.ErrBlockNotFound
}
blockHeader := &blk.MsgBlock().Header
blockReply := btcjson.BlockResult{
Hash: c.Hash,
Version: blockHeader.Version,
MerkleRoot: blockHeader.MerkleRoot.String(),
PreviousHash: blockHeader.PrevBlock.String(),
Nonce: blockHeader.Nonce,
Time: blockHeader.Timestamp.Unix(),
Confirmations: uint64(1 + maxidx - idx),
Height: idx,
Size: len(buf),
Bits: strconv.FormatInt(int64(blockHeader.Bits), 16),
Difficulty: getDifficultyRatio(blockHeader.Bits),
}
if !c.VerboseTx {
txList, _ := blk.TxShas()
txNames := make([]string, len(txList))
for i, v := range txList {
txNames[i] = v.String()
}
blockReply.Tx = txNames
} else {
txns := blk.Transactions()
rawTxns := make([]btcjson.TxRawResult, len(txns))
for i, tx := range txns {
txSha := tx.Sha().String()
mtx := tx.MsgTx()
rawTxn, err := createTxRawResult(s.server.btcnet, txSha,
mtx, blk, maxidx, sha)
if err != nil {
rpcsLog.Errorf("Cannot create TxRawResult for "+
"transaction %s: %v", txSha, err)
return nil, err
}
rawTxns[i] = *rawTxn
}
blockReply.RawTx = rawTxns
}
// Get next block unless we are already at the top.
if idx < maxidx {
var shaNext *btcwire.ShaHash
shaNext, err = s.server.db.FetchBlockShaByHeight(int64(idx + 1))
if err != nil {
rpcsLog.Errorf("No next block: %v", err)
return nil, btcjson.ErrBlockNotFound
}
blockReply.NextHash = shaNext.String()
}
return blockReply, nil
}
