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| 1 | +package firo |
| 2 | + |
| 3 | +import ( |
| 4 | + "bytes" |
| 5 | + "errors" |
| 6 | + "fmt" |
| 7 | + |
| 8 | + "github.com/btcsuite/btcd/chaincfg" |
| 9 | + "github.com/btcsuite/btcd/chaincfg/chainhash" |
| 10 | + "github.com/btcsuite/btcd/wire" |
| 11 | +) |
| 12 | + |
| 13 | +const ( |
| 14 | + // Only blocks mined with progpow are considered. |
| 15 | + // Previous mining algorithms: MTP and Lyra2z ignored as being too early for |
| 16 | + // Firo wallet on Dex ~ late 2023 |
| 17 | + ProgpowStartTime = 1635228000 // Tue Oct 26 2021 06:00:00 UTC+0 |
| 18 | + HeaderLength = 80 |
| 19 | + ProgpowExtraLength = 40 |
| 20 | + ProgpowFullHeaderLength = HeaderLength + ProgpowExtraLength |
| 21 | +) |
| 22 | + |
| 23 | +var errInvalidBlockLength = errors.New("invalid block length") |
| 24 | + |
| 25 | +// deserializeBlock deserializes the wire bytes passed in as blk and returns the |
| 26 | +// header for the network plus any Transparent transactions found parsed into a |
| 27 | +// wire.MsgBlock. |
| 28 | +// |
| 29 | +// Other transaction types are discarded; including coinbase. |
| 30 | +func deserializeBlock(net *chaincfg.Params, blk []byte) (*wire.MsgBlock, error) { |
| 31 | + var hdrHash chainhash.Hash |
| 32 | + var hdr *wire.BlockHeader |
| 33 | + |
| 34 | + // hash header |
| 35 | + var header []byte |
| 36 | + switch net.Name { |
| 37 | + case "mainnet", "testnet3", "testnet": |
| 38 | + if len(blk) < ProgpowFullHeaderLength { |
| 39 | + return nil, errInvalidBlockLength |
| 40 | + } |
| 41 | + header = make([]byte, ProgpowFullHeaderLength) |
| 42 | + copy(header, blk[:ProgpowFullHeaderLength]) |
| 43 | + |
| 44 | + case "regtest": |
| 45 | + if len(blk) < HeaderLength { |
| 46 | + return nil, errInvalidBlockLength |
| 47 | + } |
| 48 | + header = make([]byte, HeaderLength) |
| 49 | + copy(header, blk[:HeaderLength]) |
| 50 | + |
| 51 | + default: |
| 52 | + return nil, fmt.Errorf("unknown net: %s", net.Name) |
| 53 | + } |
| 54 | + hdrHash = chainhash.DoubleHashH(header) |
| 55 | + |
| 56 | + // make a reader over the full block |
| 57 | + r := bytes.NewReader(blk) |
| 58 | + |
| 59 | + // deserialize the first 80 bytes of the header |
| 60 | + hdr = &wire.BlockHeader{} |
| 61 | + err := hdr.Deserialize(r) |
| 62 | + if err != nil { |
| 63 | + return nil, fmt.Errorf("failed to deserialize block header: %w", err) |
| 64 | + } |
| 65 | + |
| 66 | + if int(hdr.Timestamp.Unix()) < ProgpowStartTime { |
| 67 | + return nil, fmt.Errorf("dex not considering blocks mined before progpow") |
| 68 | + } |
| 69 | + |
| 70 | + if net.Name != "regtest" { |
| 71 | + // Blocks mined later than progpow start time have 40 extra bytes holding |
| 72 | + // mining info. Skip over! |
| 73 | + var extraBytes = make([]byte, ProgpowExtraLength) |
| 74 | + r.Read(extraBytes) |
| 75 | + } |
| 76 | + |
| 77 | + // This block's transactions |
| 78 | + txnCount, err := wire.ReadVarInt(r, 0) |
| 79 | + if err != nil { |
| 80 | + return nil, fmt.Errorf("failed to parse transaction count: %w", err) |
| 81 | + } |
| 82 | + |
| 83 | + if txnCount == 0 { |
| 84 | + return nil, fmt.Errorf("invalid transaction count 0 -- must at least have a coinbase") |
| 85 | + } |
| 86 | + |
| 87 | + txns := make([]*wire.MsgTx, 0, txnCount) |
| 88 | + for i := 0; i < int(txnCount); i++ { |
| 89 | + tx, err := deserializeTransaction(r) |
| 90 | + |
| 91 | + if err != nil { |
| 92 | + return nil, fmt.Errorf("failed to deserialize transaction %d of %d (type=%d) in block %s: %w", |
| 93 | + i+1, txnCount, tx.txType, hdrHash.String(), err) |
| 94 | + } |
| 95 | + |
| 96 | + if tx.txType == TransactionNormal { |
| 97 | + txns = append(txns, tx.msgTx) |
| 98 | + } |
| 99 | + } |
| 100 | + |
| 101 | + return &wire.MsgBlock{ |
| 102 | + Header: *hdr, |
| 103 | + Transactions: txns, |
| 104 | + }, nil |
| 105 | +} |
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