// FetchBlockHeaderBySha - return a ShaHash
func (db *LevelDb) FetchBlockHeaderBySha(sha *wire.ShaHash) (bh *wire.BlockHeader, err error) {
db.dbLock.Lock()
defer db.dbLock.Unlock()
// Read the raw block from the database.
buf, _, err := db.fetchSha(sha)
if err != nil {
return nil, err
}
// Only deserialize the header portion and ensure the transaction count
// is zero since this is a standalone header.
var blockHeader wire.BlockHeader
err = blockHeader.Deserialize(bytes.NewReader(buf))
if err != nil {
return nil, err
}
bh = &blockHeader
return bh, err
}
// TestBlockHeaderSerialize tests BlockHeader serialize and deserialize.
func TestBlockHeaderSerialize(t *testing.T) {
nonce := uint32(123123) // 0x1e0f3
// baseBlockHdr is used in the various tests as a baseline BlockHeader.
bits := uint32(0x1d00ffff)
baseBlockHdr := &wire.BlockHeader{
Version: 1,
PrevBlock: mainNetGenesisHash,
MerkleRoot: mainNetGenesisMerkleRoot,
Timestamp: time.Unix(0x495fab29, 0), // 2009-01-03 12:15:05 -0600 CST
Bits: bits,
Nonce: nonce,
}
// baseBlockHdrEncoded is the wire encoded bytes of baseBlockHdr.
baseBlockHdrEncoded := []byte{
0x01, 0x00, 0x00, 0x00, // Version 1
0x6f, 0xe2, 0x8c, 0x0a, 0xb6, 0xf1, 0xb3, 0x72,
0xc1, 0xa6, 0xa2, 0x46, 0xae, 0x63, 0xf7, 0x4f,
0x93, 0x1e, 0x83, 0x65, 0xe1, 0x5a, 0x08, 0x9c,
0x68, 0xd6, 0x19, 0x00, 0x00, 0x00, 0x00, 0x00, // PrevBlock
0x3b, 0xa3, 0xed, 0xfd, 0x7a, 0x7b, 0x12, 0xb2,
0x7a, 0xc7, 0x2c, 0x3e, 0x67, 0x76, 0x8f, 0x61,
0x7f, 0xc8, 0x1b, 0xc3, 0x88, 0x8a, 0x51, 0x32,
0x3a, 0x9f, 0xb8, 0xaa, 0x4b, 0x1e, 0x5e, 0x4a, // MerkleRoot
0x29, 0xab, 0x5f, 0x49, // Timestamp
0xff, 0xff, 0x00, 0x1d, // Bits
0xf3, 0xe0, 0x01, 0x00, // Nonce
}
tests := []struct {
in *wire.BlockHeader // Data to encode
out *wire.BlockHeader // Expected decoded data
buf []byte // Serialized data
}{
{
baseBlockHdr,
baseBlockHdr,
baseBlockHdrEncoded,
},
}
t.Logf("Running %d tests", len(tests))
for i, test := range tests {
// Serialize the block header.
var buf bytes.Buffer
err := test.in.Serialize(&buf)
if err != nil {
t.Errorf("Serialize #%d error %v", i, err)
continue
}
if !bytes.Equal(buf.Bytes(), test.buf) {
t.Errorf("Serialize #%d\n got: %s want: %s", i,
spew.Sdump(buf.Bytes()), spew.Sdump(test.buf))
continue
}
// Deserialize the block header.
var bh wire.BlockHeader
rbuf := bytes.NewReader(test.buf)
err = bh.Deserialize(rbuf)
if err != nil {
t.Errorf("Deserialize #%d error %v", i, err)
continue
}
if !reflect.DeepEqual(&bh, test.out) {
t.Errorf("Deserialize #%d\n got: %s want: %s", i,
spew.Sdump(&bh), spew.Sdump(test.out))
continue
}
}
}