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chainkit_client.go
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/
chainkit_client.go
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package lndclient
import (
"bytes"
"context"
"sync"
"time"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/wire"
"github.com/lightningnetwork/lnd/lnrpc/chainrpc"
"google.golang.org/grpc"
)
// ChainKitClient exposes chain functionality.
type ChainKitClient interface {
// GetBlock returns a block given the corresponding block hash.
GetBlock(ctx context.Context, hash chainhash.Hash) (*wire.MsgBlock,
error)
// GetBestBlock returns the latest block hash and current height of the
// valid most-work chain.
GetBestBlock(ctx context.Context) (chainhash.Hash, int32, error)
// GetBlockHash returns the hash of the block in the best blockchain
// at the given height.
GetBlockHash(ctx context.Context, blockHeight int64) (chainhash.Hash,
error)
}
type chainKitClient struct {
client chainrpc.ChainKitClient
chainMac serializedMacaroon
timeout time.Duration
wg sync.WaitGroup
}
func newChainKitClient(conn grpc.ClientConnInterface,
chainMac serializedMacaroon, timeout time.Duration) *chainKitClient {
return &chainKitClient{
client: chainrpc.NewChainKitClient(conn),
chainMac: chainMac,
timeout: timeout,
}
}
func (s *chainKitClient) WaitForFinished() {
s.wg.Wait()
}
// GetBlock returns a block given the corresponding block hash.
func (s *chainKitClient) GetBlock(ctxParent context.Context,
hash chainhash.Hash) (*wire.MsgBlock, error) {
ctx, cancel := context.WithTimeout(ctxParent, s.timeout)
defer cancel()
macaroonAuth := s.chainMac.WithMacaroonAuth(ctx)
req := &chainrpc.GetBlockRequest{
BlockHash: hash[:],
}
resp, err := s.client.GetBlock(macaroonAuth, req)
if err != nil {
return nil, err
}
// Convert raw block bytes into wire.MsgBlock.
msgBlock := &wire.MsgBlock{}
blockReader := bytes.NewReader(resp.RawBlock)
err = msgBlock.Deserialize(blockReader)
if err != nil {
return nil, err
}
return msgBlock, nil
}
// GetBestBlock returns the block hash and current height from the valid
// most-work chain.
func (s *chainKitClient) GetBestBlock(ctxParent context.Context) (chainhash.Hash,
int32, error) {
ctx, cancel := context.WithTimeout(ctxParent, s.timeout)
defer cancel()
macaroonAuth := s.chainMac.WithMacaroonAuth(ctx)
resp, err := s.client.GetBestBlock(
macaroonAuth, &chainrpc.GetBestBlockRequest{},
)
if err != nil {
return chainhash.Hash{}, 0, err
}
// Cast gRPC block hash bytes as chain hash type.
var blockHash chainhash.Hash
copy(blockHash[:], resp.BlockHash)
return blockHash, resp.BlockHeight, nil
}
// GetBlockHash returns the hash of the block in the best blockchain at the
// given height.
func (s *chainKitClient) GetBlockHash(ctxParent context.Context,
blockHeight int64) (chainhash.Hash, error) {
ctx, cancel := context.WithTimeout(ctxParent, s.timeout)
defer cancel()
macaroonAuth := s.chainMac.WithMacaroonAuth(ctx)
req := &chainrpc.GetBlockHashRequest{BlockHeight: blockHeight}
resp, err := s.client.GetBlockHash(macaroonAuth, req)
if err != nil {
return chainhash.Hash{}, err
}
// Cast gRPC block hash bytes as chain hash type.
var blockHash chainhash.Hash
copy(blockHash[:], resp.BlockHash)
return blockHash, nil
}