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lnd.go
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lnd.go
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package btcdocker
import (
"context"
"fmt"
"io"
"math/rand/v2"
"os"
"path/filepath"
"strconv"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/api/types/mount"
"github.com/lightningnetwork/lnd/lnrpc"
"github.com/lightningnetwork/lnd/macaroons"
"github.com/testcontainers/testcontainers-go"
"github.com/testcontainers/testcontainers-go/wait"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"gopkg.in/macaroon.v2"
)
const (
LND_GRPC_PORT = "10009"
LND_REST_PORT = "8080"
LND_P2P_PORT = "9735"
)
type Lnd struct {
testcontainers.Container
Client lnrpc.LightningClient
// ContainerIP is to be used when communicating between containers in the network
ContainerIP string
Host string
// These are the mapped ports which are exposed to the host
GrpcPort string
RestPort string
P2PPort string
LndDir string
AdminMacaroon []byte
}
func NewLnd(ctx context.Context, bitcoind *Bitcoind) (*Lnd, error) {
randomId := strconv.Itoa(rand.Int())
lndDir := filepath.Join(bitcoind.dir, randomId)
if err := os.MkdirAll(lndDir, 0777); err != nil {
return nil, fmt.Errorf("error creating lnd dir: %v", err)
}
rpchost := bitcoind.ContainerIP + ":" + BITCOIND_RPC_PORT
lndReq := testcontainers.ContainerRequest{
Image: "polarlightning/lnd:0.17.4-beta",
ExposedPorts: []string{
LND_REST_PORT,
LND_P2P_PORT,
LND_GRPC_PORT,
},
Networks: []string{bitcoind.network},
Cmd: []string{
"lnd",
"--noseedbackup",
"--debuglevel=debug",
"--listen=0.0.0.0:" + LND_P2P_PORT,
"--rpclisten=0.0.0.0:" + LND_GRPC_PORT,
"--restlisten=0.0.0.0:" + LND_REST_PORT,
"--protocol.wumbo-channels",
"--bitcoin.active",
"--bitcoin.regtest",
"--bitcoin.node=bitcoind",
"--bitcoind.rpchost=" + rpchost,
"--bitcoind.rpcuser=" + RPC_USER,
"--bitcoind.rpcpass=" + RPC_PASSWORD,
"--bitcoind.zmqpubrawblock=tcp://" + bitcoind.ContainerIP + ":" + BITCOIND_ZMQPUBRAWBLOCK_PORT,
"--bitcoind.zmqpubrawtx=tcp://" + bitcoind.ContainerIP + ":" + BITCOIND_ZMQPUBRAWTX_PORT,
},
HostConfigModifier: func(hc *container.HostConfig) {
hc.Mounts = []mount.Mount{
{
Type: mount.Type("bind"),
Source: lndDir,
Target: "/home/lnd/.lnd",
BindOptions: &mount.BindOptions{
CreateMountpoint: true,
},
},
}
},
WaitingFor: wait.ForAll(
wait.ForListeningPort(LND_REST_PORT),
wait.ForListeningPort(LND_P2P_PORT),
wait.ForListeningPort(LND_GRPC_PORT),
),
}
container, err := testcontainers.GenericContainer(ctx, testcontainers.GenericContainerRequest{
ContainerRequest: lndReq,
Started: true,
})
if err != nil {
return nil, err
}
containerIP, err := container.ContainerIP(ctx)
if err != nil {
return nil, err
}
host, err := container.Host(ctx)
if err != nil {
return nil, err
}
grpcPort, err := container.MappedPort(ctx, LND_GRPC_PORT)
if err != nil {
return nil, err
}
restPort, err := container.MappedPort(ctx, LND_REST_PORT)
if err != nil {
return nil, err
}
p2pPort, err := container.MappedPort(ctx, LND_P2P_PORT)
if err != nil {
return nil, err
}
macaroonFile, err := container.CopyFileFromContainer(ctx, "/home/lnd/.lnd/data/chain/bitcoin/regtest/admin.macaroon")
if err != nil {
return nil, fmt.Errorf("error getting macaroon file from container: %v", err)
}
macaroonBytes, err := io.ReadAll(macaroonFile)
if err != nil {
return nil, fmt.Errorf("error reading macaroon file: %v", err)
}
lndHost := host + ":" + grpcPort.Port()
tlsCert := filepath.Join(lndDir, "tls.cert")
lndClient, err := SetupLndClient(lndHost, tlsCert, macaroonBytes)
if err != nil {
return nil, fmt.Errorf("error setting up lnd client: %v", err)
}
lnd := &Lnd{
Container: container,
Client: lndClient,
ContainerIP: containerIP,
Host: host,
GrpcPort: grpcPort.Port(),
RestPort: restPort.Port(),
P2PPort: p2pPort.Port(),
LndDir: lndDir,
AdminMacaroon: macaroonBytes,
}
return lnd, nil
}
func SetupLndClient(host string, tlsCert string, macaroonBytes []byte) (lnrpc.LightningClient, error) {
creds, err := credentials.NewClientTLSFromFile(tlsCert, "")
if err != nil {
return nil, fmt.Errorf("error setting tls creds: %v", err)
}
macaroon := &macaroon.Macaroon{}
if err = macaroon.UnmarshalBinary(macaroonBytes); err != nil {
return nil, fmt.Errorf("error unmarshalling macaroon: %v", err)
}
macarooncreds, err := macaroons.NewMacaroonCredential(macaroon)
if err != nil {
return nil, fmt.Errorf("error setting macaroon creds: %v", err)
}
opts := []grpc.DialOption{
grpc.WithTransportCredentials(creds),
grpc.WithPerRPCCredentials(macarooncreds),
}
conn, err := grpc.Dial(host, opts...)
if err != nil {
return nil, fmt.Errorf("error setting up grpc client: %v", err)
}
grpcClient := lnrpc.NewLightningClient(conn)
return grpcClient, nil
}