483 lines
13 KiB
Go
483 lines
13 KiB
Go
package server
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import (
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"bytes"
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"compress/zlib"
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"crypto/sha256"
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"encoding/base64"
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"encoding/binary"
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"encoding/hex"
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"errors"
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"fmt"
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"net/http"
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"strings"
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"github.com/gorilla/rpc"
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"github.com/lbryio/herald.go/db"
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"github.com/lbryio/herald.go/internal"
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"github.com/lbryio/lbcd/chaincfg"
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"github.com/lbryio/lbcd/chaincfg/chainhash"
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"github.com/lbryio/lbcd/txscript"
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"github.com/lbryio/lbcd/wire"
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"github.com/lbryio/lbcutil"
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"golang.org/x/exp/constraints"
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)
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type BlockchainCodec struct {
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rpc.Codec
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}
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func (c *BlockchainCodec) NewRequest(r *http.Request) rpc.CodecRequest {
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return &BlockchainCodecRequest{c.Codec.NewRequest(r)}
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}
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// BlockchainCodecRequest provides ability to rewrite the incoming
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// request "method" field. For example:
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// blockchain.block.get_header -> blockchain_block.Get_header
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// blockchain.address.listunspent -> blockchain_address.Listunspent
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// This makes the "method" string compatible with Gorilla/RPC
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// requirements.
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type BlockchainCodecRequest struct {
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rpc.CodecRequest
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}
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func (cr *BlockchainCodecRequest) Method() (string, error) {
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rawMethod, err := cr.CodecRequest.Method()
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if err != nil {
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return rawMethod, err
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}
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parts := strings.Split(rawMethod, ".")
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if len(parts) < 2 {
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return rawMethod, fmt.Errorf("blockchain rpc: service/method ill-formed: %q", rawMethod)
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}
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service := strings.Join(parts[0:len(parts)-1], "_")
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method := parts[len(parts)-1]
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if len(method) < 1 {
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return rawMethod, fmt.Errorf("blockchain rpc: method ill-formed: %q", method)
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}
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method = strings.ToUpper(string(method[0])) + string(method[1:])
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return service + "." + method, err
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}
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// BlockchainService methods handle "blockchain.block.*" RPCs
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type BlockchainService struct {
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DB *db.ReadOnlyDBColumnFamily
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Chain *chaincfg.Params
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}
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// BlockchainAddressService methods handle "blockchain.address.*" RPCs
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type BlockchainAddressService struct {
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BlockchainService
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}
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// BlockchainScripthashService methods handle "blockchain.scripthash.*" RPCs
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type BlockchainScripthashService struct {
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BlockchainService
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}
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const CHUNK_SIZE = 96
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const MAX_CHUNK_SIZE = 40960
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const HEADER_SIZE = wire.MaxBlockHeaderPayload
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const HASHX_LEN = 11
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func min[Ord constraints.Ordered](x, y Ord) Ord {
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if x < y {
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return x
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}
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return y
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}
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type BlockGetServerHeightReq struct{}
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type BlockGetServerHeightResp uint32
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func (s *BlockchainService) Get_server_height(r *http.Request, req *BlockGetServerHeightReq, resp **BlockGetServerHeightResp) error {
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if s.DB == nil || s.DB.LastState == nil {
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return fmt.Errorf("unknown height")
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}
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result := BlockGetServerHeightResp(s.DB.LastState.Height)
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*resp = &result
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return nil
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}
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type BlockGetChunkReq uint32
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type BlockGetChunkResp string
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// 'blockchain.block.get_chunk'
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func (s *BlockchainService) Get_chunk(r *http.Request, req *BlockGetChunkReq, resp **BlockGetChunkResp) error {
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index := uint32(*req)
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db_headers, err := s.DB.GetHeaders(index*CHUNK_SIZE, CHUNK_SIZE)
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if err != nil {
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return err
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}
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raw := make([]byte, 0, HEADER_SIZE*len(db_headers))
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for _, h := range db_headers {
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raw = append(raw, h[:]...)
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}
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headers := BlockGetChunkResp(hex.EncodeToString(raw))
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*resp = &headers
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return err
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}
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type BlockGetHeaderReq uint32
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type BlockGetHeaderResp struct {
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Version uint32 `json:"version"`
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PrevBlockHash string `json:"prev_block_hash"`
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MerkleRoot string `json:"merkle_root"`
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ClaimTrieRoot string `json:"claim_trie_root"`
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Timestamp uint32 `json:"timestamp"`
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Bits uint32 `json:"bits"`
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Nonce uint32 `json:"nonce"`
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BlockHeight uint32 `json:"block_height"`
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}
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// 'blockchain.block.get_header'
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func (s *BlockchainService) Get_header(r *http.Request, req *BlockGetHeaderReq, resp **BlockGetHeaderResp) error {
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height := uint32(*req)
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headers, err := s.DB.GetHeaders(height, 1)
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if err != nil {
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return err
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}
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if len(headers) < 1 {
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return errors.New("not found")
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}
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decode := func(header *[HEADER_SIZE]byte, height uint32) *BlockGetHeaderResp {
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var h1, h2, h3 chainhash.Hash
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h1.SetBytes(header[4:36])
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h2.SetBytes(header[36:68])
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h3.SetBytes(header[68:100])
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return &BlockGetHeaderResp{
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Version: binary.LittleEndian.Uint32(header[0:]),
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PrevBlockHash: h1.String(),
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MerkleRoot: h2.String(),
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ClaimTrieRoot: h3.String(),
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Timestamp: binary.LittleEndian.Uint32(header[100:]),
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Bits: binary.LittleEndian.Uint32(header[104:]),
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Nonce: binary.LittleEndian.Uint32(header[108:]),
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BlockHeight: height,
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}
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}
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*resp = decode(&headers[0], height)
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return err
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}
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type BlockHeadersReq struct {
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StartHeight uint32 `json:"start_height"`
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Count uint32 `json:"count"`
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CpHeight uint32 `json:"cp_height"`
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B64 bool `json:"b64"`
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}
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type BlockHeadersResp struct {
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Base64 string `json:"base64,omitempty"`
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Hex string `json:"hex,omitempty"`
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Count uint32 `json:"count"`
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Max uint32 `json:"max"`
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Branch string `json:"branch,omitempty"`
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Root string `json:"root,omitempty"`
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}
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// 'blockchain.block.headers'
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func (s *BlockchainService) Headers(r *http.Request, req *BlockHeadersReq, resp **BlockHeadersResp) error {
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count := min(req.Count, MAX_CHUNK_SIZE)
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db_headers, err := s.DB.GetHeaders(req.StartHeight, count)
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if err != nil {
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return err
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}
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count = uint32(len(db_headers))
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raw := make([]byte, 0, HEADER_SIZE*count)
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for _, h := range db_headers {
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raw = append(raw, h[:]...)
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}
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result := &BlockHeadersResp{
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Count: count,
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Max: MAX_CHUNK_SIZE,
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}
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if req.B64 {
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zipped := bytes.Buffer{}
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w := zlib.NewWriter(&zipped)
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w.Write(raw)
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w.Close()
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result.Base64 = base64.StdEncoding.EncodeToString(zipped.Bytes())
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} else {
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result.Hex = hex.EncodeToString(raw)
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}
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if count > 0 && req.CpHeight > 0 {
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// TODO
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//last_height := height + count - 1
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}
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*resp = result
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return err
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}
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func decodeScriptHash(scripthash string) ([]byte, error) {
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sh, err := hex.DecodeString(scripthash)
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if err != nil {
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return nil, err
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}
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if len(sh) != chainhash.HashSize {
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return nil, fmt.Errorf("invalid scripthash: %v (length %v)", scripthash, len(sh))
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}
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internal.ReverseBytesInPlace(sh)
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return sh, nil
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}
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func hashX(scripthash []byte) []byte {
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return scripthash[:HASHX_LEN]
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}
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func hashXScript(script []byte, coin *chaincfg.Params) []byte {
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if _, err := txscript.ExtractClaimScript(script); err == nil {
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baseScript := txscript.StripClaimScriptPrefix(script)
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if class, addrs, _, err := txscript.ExtractPkScriptAddrs(baseScript, coin); err == nil {
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switch class {
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case txscript.PubKeyHashTy, txscript.ScriptHashTy, txscript.PubKeyTy:
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script, _ := txscript.PayToAddrScript(addrs[0])
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return hashXScript(script, coin)
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}
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}
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}
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sum := sha256.Sum256(script)
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return sum[:HASHX_LEN]
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}
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type AddressGetBalanceReq struct {
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Address string `json:"address"`
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}
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type AddressGetBalanceResp struct {
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Confirmed uint64 `json:"confirmed"`
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Unconfirmed uint64 `json:"unconfirmed"`
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}
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// 'blockchain.address.get_balance'
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func (s *BlockchainAddressService) Get_balance(r *http.Request, req *AddressGetBalanceReq, resp **AddressGetBalanceResp) error {
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address, err := lbcutil.DecodeAddress(req.Address, s.Chain)
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if err != nil {
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return err
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}
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script, err := txscript.PayToAddrScript(address)
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if err != nil {
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return err
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}
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hashX := hashXScript(script, s.Chain)
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confirmed, unconfirmed, err := s.DB.GetBalance(hashX)
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if err != nil {
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return err
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}
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*resp = &AddressGetBalanceResp{confirmed, unconfirmed}
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return err
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}
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type scripthashGetBalanceReq struct {
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ScriptHash string `json:"scripthash"`
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}
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type ScripthashGetBalanceResp struct {
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Confirmed uint64 `json:"confirmed"`
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Unconfirmed uint64 `json:"unconfirmed"`
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}
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// 'blockchain.scripthash.get_balance'
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func (s *BlockchainScripthashService) Get_balance(r *http.Request, req *scripthashGetBalanceReq, resp **ScripthashGetBalanceResp) error {
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scripthash, err := decodeScriptHash(req.ScriptHash)
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if err != nil {
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return err
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}
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hashX := hashX(scripthash)
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confirmed, unconfirmed, err := s.DB.GetBalance(hashX)
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if err != nil {
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return err
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}
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*resp = &ScripthashGetBalanceResp{confirmed, unconfirmed}
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return err
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}
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type AddressGetHistoryReq struct {
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Address string `json:"address"`
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}
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type TxInfo struct {
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TxHash string `json:"tx_hash"`
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Height uint32 `json:"height"`
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}
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type TxInfoFee struct {
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TxInfo
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Fee uint64 `json:"fee"`
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}
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type AddressGetHistoryResp struct {
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Confirmed []TxInfo `json:"confirmed"`
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Unconfirmed []TxInfoFee `json:"unconfirmed"`
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}
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// 'blockchain.address.get_history'
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func (s *BlockchainAddressService) Get_history(r *http.Request, req *AddressGetHistoryReq, resp **AddressGetHistoryResp) error {
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address, err := lbcutil.DecodeAddress(req.Address, s.Chain)
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if err != nil {
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return err
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}
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script, err := txscript.PayToAddrScript(address)
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if err != nil {
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return err
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}
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hashX := hashXScript(script, s.Chain)
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dbTXs, err := s.DB.GetHistory(hashX)
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if err != nil {
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return err
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}
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confirmed := make([]TxInfo, 0, len(dbTXs))
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for _, tx := range dbTXs {
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confirmed = append(confirmed,
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TxInfo{
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TxHash: tx.TxHash.String(),
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Height: tx.Height,
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})
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}
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result := &AddressGetHistoryResp{
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Confirmed: confirmed,
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Unconfirmed: []TxInfoFee{}, // TODO
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}
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*resp = result
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return err
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}
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type ScripthashGetHistoryReq struct {
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ScriptHash string `json:"scripthash"`
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}
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type ScripthashGetHistoryResp struct {
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Confirmed []TxInfo `json:"confirmed"`
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Unconfirmed []TxInfoFee `json:"unconfirmed"`
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}
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// 'blockchain.scripthash.get_history'
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func (s *BlockchainScripthashService) Get_history(r *http.Request, req *ScripthashGetHistoryReq, resp **ScripthashGetHistoryResp) error {
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scripthash, err := decodeScriptHash(req.ScriptHash)
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if err != nil {
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return err
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}
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hashX := hashX(scripthash)
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dbTXs, err := s.DB.GetHistory(hashX)
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if err != nil {
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return err
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}
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confirmed := make([]TxInfo, 0, len(dbTXs))
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for _, tx := range dbTXs {
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confirmed = append(confirmed,
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TxInfo{
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TxHash: tx.TxHash.String(),
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Height: tx.Height,
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})
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}
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result := &ScripthashGetHistoryResp{
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Confirmed: confirmed,
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Unconfirmed: []TxInfoFee{}, // TODO
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}
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*resp = result
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return err
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}
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type AddressGetMempoolReq struct {
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Address string `json:"address"`
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}
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type AddressGetMempoolResp []TxInfoFee
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// 'blockchain.address.get_mempool'
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func (s *BlockchainAddressService) Get_mempool(r *http.Request, req *AddressGetMempoolReq, resp **AddressGetMempoolResp) error {
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address, err := lbcutil.DecodeAddress(req.Address, s.Chain)
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if err != nil {
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return err
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}
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script, err := txscript.PayToAddrScript(address)
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if err != nil {
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return err
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}
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hashX := hashXScript(script, s.Chain)
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// TODO...
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internal.ReverseBytesInPlace(hashX)
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unconfirmed := make([]TxInfoFee, 0, 100)
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result := AddressGetMempoolResp(unconfirmed)
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*resp = &result
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return err
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}
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type ScripthashGetMempoolReq struct {
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ScriptHash string `json:"scripthash"`
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}
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type ScripthashGetMempoolResp []TxInfoFee
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// 'blockchain.scripthash.get_mempool'
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func (s *BlockchainScripthashService) Get_mempool(r *http.Request, req *ScripthashGetMempoolReq, resp **ScripthashGetMempoolResp) error {
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scripthash, err := decodeScriptHash(req.ScriptHash)
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if err != nil {
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return err
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}
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hashX := hashX(scripthash)
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// TODO...
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internal.ReverseBytesInPlace(hashX)
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unconfirmed := make([]TxInfoFee, 0, 100)
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result := ScripthashGetMempoolResp(unconfirmed)
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*resp = &result
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return err
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}
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type AddressListUnspentReq struct {
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Address string `json:"address"`
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}
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type TXOInfo struct {
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TxHash string `json:"tx_hash"`
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TxPos uint16 `json:"tx_pos"`
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Height uint32 `json:"height"`
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Value uint64 `json:"value"`
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}
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type AddressListUnspentResp []TXOInfo
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// 'blockchain.address.listunspent'
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func (s *BlockchainAddressService) Listunspent(r *http.Request, req *AddressListUnspentReq, resp **AddressListUnspentResp) error {
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address, err := lbcutil.DecodeAddress(req.Address, s.Chain)
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if err != nil {
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return err
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}
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script, err := txscript.PayToAddrScript(address)
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if err != nil {
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return err
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}
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hashX := hashXScript(script, s.Chain)
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dbTXOs, err := s.DB.GetUnspent(hashX)
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unspent := make([]TXOInfo, 0, len(dbTXOs))
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for _, txo := range dbTXOs {
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unspent = append(unspent,
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TXOInfo{
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TxHash: txo.TxHash.String(),
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TxPos: txo.TxPos,
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Height: txo.Height,
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Value: txo.Value,
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})
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}
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result := AddressListUnspentResp(unspent)
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*resp = &result
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return err
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}
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type ScripthashListUnspentReq struct {
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ScriptHash string `json:"scripthash"`
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}
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type ScripthashListUnspentResp []TXOInfo
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// 'blockchain.scripthash.listunspent'
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func (s *BlockchainScripthashService) Listunspent(r *http.Request, req *ScripthashListUnspentReq, resp **ScripthashListUnspentResp) error {
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scripthash, err := decodeScriptHash(req.ScriptHash)
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if err != nil {
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return err
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}
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hashX := hashX(scripthash)
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dbTXOs, err := s.DB.GetUnspent(hashX)
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unspent := make([]TXOInfo, 0, len(dbTXOs))
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for _, txo := range dbTXOs {
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unspent = append(unspent,
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TXOInfo{
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TxHash: txo.TxHash.String(),
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TxPos: txo.TxPos,
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Height: txo.Height,
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Value: txo.Value,
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})
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}
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result := ScripthashListUnspentResp(unspent)
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*resp = &result
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return err
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}
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