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package p2p
import "bytes"
import "encoding/binary"
import "github.com/romana/rlog"
import "github.com/deroproject/derosuite/blockchain"
// FIXME this code can also be shared by NOTIFY_NEW_BLOCK, NOTIFY_NEW_TRANSACTIONS, Handle_BC_Notify_Response_GetObjects
// this code handles a new block floating in the network
func Handle_BC_Notify_New_Block(connection *Connection,
i_command_header *Levin_Header, buf []byte) {
var bl blockchain.Block
connection.logger.Debugf("Incoming NOTIFY_NEW_BLOCK")
// deserialize data header
var i_data_header Levin_Data_Header // incoming data header
err := i_data_header.DeSerialize(buf)
if err != nil {
connection.logger.Debugf("We should destroy connection here, data header cnot deserialized")
return
}
buf = i_data_header.Data
pos := bytes.Index(buf, []byte("block"))
// find inner position of block
pos = pos + 6 // jump to varint length position and decode
buf = buf[pos:]
block_length, done := Decode_Boost_Varint(buf)
rlog.Tracef(2, "Block length %d %x\n", block_length, buf[:8])
buf = buf[done:]
block_buf := buf[:block_length]
err = bl.Deserialize(block_buf)
if err != nil {
connection.logger.Warnf("Block could not be deserialized successfully err %s\n", err)
connection.logger.Debugf("We should destroy connection here, block not deserialized")
return
}
hash := bl.GetHash()
rlog.Tracef(1, "Block deserialized successfully %x\n", hash[:32])
rlog.Tracef(1, "Tx hash length %d\n", len(bl.Tx_hashes))
for i := range bl.Tx_hashes {
rlog.Tracef(2, "%d tx %x\n", i, bl.Tx_hashes[i][:32])
}
// point buffer to check whether any more tx exist
buf = buf[block_length:]
pos = bytes.Index(buf, []byte("\x03txs\x8a")) // at this point to
if pos > -1 {
rlog.Tracef(3, "txt pos %d\n", pos)
buf = buf[pos+5:]
// decode remain data length ( though we know it from buffer size, but still verify it )
tx_count, done := Decode_Boost_Varint(buf)
buf = buf[done:]
for i := uint64(0); i < tx_count; i++ {
var tx blockchain.Transaction
tx_len, done := Decode_Boost_Varint(buf)
buf = buf[done:]
rlog.Tracef(3, "tx count %d i %d tx_len %d\n", tx_count, i, tx_len)
tx_bytes := buf[:tx_len]
// deserialize and verrify transaction
err = tx.DeserializeHeader(tx_bytes)
if err != nil {
connection.logger.Warnf("Transaction could not be deserialized\n")
} else {
hash := tx.GetHash()
rlog.Tracef(2, "Transaction deserialised successfully hash %x\n", hash[:32])
// add tx to block chain, we must verify that the tx has been mined
// add all transaction to TX pool , if not added
chain.Add_TX(&tx)
}
buf = buf[tx_len:] // setup for next tx
}
}
height_string := []byte("\x19current_blockchain_height\x05")
pos = bytes.Index(buf, height_string) // at this point to
if pos < 0 {
connection.logger.Debugf("We should destroy connection here, block not deserialized")
return
}
pos = pos + len(height_string)
buf = buf[pos:]
current_peer_height := binary.LittleEndian.Uint64(buf)
connection.Last_Height = current_peer_height
//connection.logger.Infof("buffer height %x current height %d complete %d\n", buf, connection.Last_Height, complete_block)
// at this point, if it's a block we should try to add it to block chain
// try to add block to chain
connection.logger.Debugf("Found new block adding it to chain %x", bl.GetHash())
chain.Chain_Add(&bl)
}