_ Git - ldk-sample/blob - src/bitcoind_client.rs

   1 use crate::convert::{BlockchainInfo, FeeResponse, FundedTx, NewAddress, RawTx, SignedTx};
   2 use base64;
   3 use bitcoin::blockdata::transaction::Transaction;
   4 use bitcoin::consensus::encode;
   5 use bitcoin::hash_types::{BlockHash, Txid};
   6 use bitcoin::util::address::Address;
   7 use lightning::chain::chaininterface::{BroadcasterInterface, ConfirmationTarget, FeeEstimator};
   8 use lightning_block_sync::http::HttpEndpoint;
   9 use lightning_block_sync::rpc::RpcClient;
  10 use lightning_block_sync::{AsyncBlockSourceResult, BlockData, BlockHeaderData, BlockSource};
  11 use serde_json;
  12 use std::collections::HashMap;
  13 use std::str::FromStr;
  14 use std::sync::atomic::{AtomicU32, Ordering};
  15 use std::sync::Arc;
  16 use std::time::Duration;
  17
  18 pub struct BitcoindClient {
  19         bitcoind_rpc_client: Arc<RpcClient>,
  20         host: String,
  21         port: u16,
  22         rpc_user: String,
  23         rpc_password: String,
  24         fees: Arc<HashMap<Target, AtomicU32>>,
  25         handle: tokio::runtime::Handle,
  26 }
  27
  28 #[derive(Clone, Eq, Hash, PartialEq)]
  29 pub enum Target {
  30         Background,
  31         Normal,
  32         HighPriority,
  33 }
  34
  35 impl BlockSource for BitcoindClient {
  36         fn get_header<'a>(
  37                 &'a self, header_hash: &'a BlockHash, height_hint: Option<u32>,
  38         ) -> AsyncBlockSourceResult<'a, BlockHeaderData> {
  39                 Box::pin(async move { self.bitcoind_rpc_client.get_header(header_hash, height_hint).await })
  40         }
  41
  42         fn get_block<'a>(
  43                 &'a self, header_hash: &'a BlockHash,
  44         ) -> AsyncBlockSourceResult<'a, BlockData> {
  45                 Box::pin(async move { self.bitcoind_rpc_client.get_block(header_hash).await })
  46         }
  47
  48         fn get_best_block<'a>(&'a self) -> AsyncBlockSourceResult<(BlockHash, Option<u32>)> {
  49                 Box::pin(async move { self.bitcoind_rpc_client.get_best_block().await })
  50         }
  51 }
  52
  53 /// The minimum feerate we are allowed to send, as specify by LDK.
  54 const MIN_FEERATE: u32 = 253;
  55
  56 impl BitcoindClient {
  57         pub async fn new(
  58                 host: String, port: u16, rpc_user: String, rpc_password: String,
  59                 handle: tokio::runtime::Handle,
  60         ) -> std::io::Result<Self> {
  61                 let http_endpoint = HttpEndpoint::for_host(host.clone()).with_port(port);
  62                 let rpc_credentials =
  63                         base64::encode(format!("{}:{}", rpc_user.clone(), rpc_password.clone()));
  64                 let bitcoind_rpc_client = RpcClient::new(&rpc_credentials, http_endpoint)?;
  65                 let _dummy = bitcoind_rpc_client
  66                         .call_method::<BlockchainInfo>("getblockchaininfo", &vec![])
  67                         .await
  68                         .map_err(|_| {
  69                                 std::io::Error::new(std::io::ErrorKind::PermissionDenied,
  70                                 "Failed to make initial call to bitcoind - please check your RPC user/password and access settings")
  71                         })?;
  72                 let mut fees: HashMap<Target, AtomicU32> = HashMap::new();
  73                 fees.insert(Target::Background, AtomicU32::new(MIN_FEERATE));
  74                 fees.insert(Target::Normal, AtomicU32::new(2000));
  75                 fees.insert(Target::HighPriority, AtomicU32::new(5000));
  76                 let client = Self {
  77                         bitcoind_rpc_client: Arc::new(bitcoind_rpc_client),
  78                         host,
  79                         port,
  80                         rpc_user,
  81                         rpc_password,
  82                         fees: Arc::new(fees),
  83                         handle: handle.clone(),
  84                 };
  85                 BitcoindClient::poll_for_fee_estimates(
  86                         client.fees.clone(),
  87                         client.bitcoind_rpc_client.clone(),
  88                         handle,
  89                 );
  90                 Ok(client)
  91         }
  92
  93         fn poll_for_fee_estimates(
  94                 fees: Arc<HashMap<Target, AtomicU32>>, rpc_client: Arc<RpcClient>,
  95                 handle: tokio::runtime::Handle,
  96         ) {
  97                 handle.spawn(async move {
  98                         loop {
  99                                 let background_estimate = {
 100                                         let background_conf_target = serde_json::json!(144);
 101                                         let background_estimate_mode = serde_json::json!("ECONOMICAL");
 102                                         let resp = rpc_client
 103                                                 .call_method::<FeeResponse>(
 104                                                         "estimatesmartfee",
 105                                                         &vec![background_conf_target, background_estimate_mode],
 106                                                 )
 107                                                 .await
 108                                                 .unwrap();
 109                                         match resp.feerate_sat_per_kw {
 110                                                 Some(feerate) => std::cmp::max(feerate, MIN_FEERATE),
 111                                                 None => MIN_FEERATE,
 112                                         }
 113                                 };
 114
 115                                 let normal_estimate = {
 116                                         let normal_conf_target = serde_json::json!(18);
 117                                         let normal_estimate_mode = serde_json::json!("ECONOMICAL");
 118                                         let resp = rpc_client
 119                                                 .call_method::<FeeResponse>(
 120                                                         "estimatesmartfee",
 121                                                         &vec![normal_conf_target, normal_estimate_mode],
 122                                                 )
 123                                                 .await
 124                                                 .unwrap();
 125                                         match resp.feerate_sat_per_kw {
 126                                                 Some(feerate) => std::cmp::max(feerate, MIN_FEERATE),
 127                                                 None => 2000,
 128                                         }
 129                                 };
 130
 131                                 let high_prio_estimate = {
 132                                         let high_prio_conf_target = serde_json::json!(6);
 133                                         let high_prio_estimate_mode = serde_json::json!("CONSERVATIVE");
 134                                         let resp = rpc_client
 135                                                 .call_method::<FeeResponse>(
 136                                                         "estimatesmartfee",
 137                                                         &vec![high_prio_conf_target, high_prio_estimate_mode],
 138                                                 )
 139                                                 .await
 140                                                 .unwrap();
 141
 142                                         match resp.feerate_sat_per_kw {
 143                                                 Some(feerate) => std::cmp::max(feerate, MIN_FEERATE),
 144                                                 None => 5000,
 145                                         }
 146                                 };
 147
 148                                 fees.get(&Target::Background)
 149                                         .unwrap()
 150                                         .store(background_estimate, Ordering::Release);
 151                                 fees.get(&Target::Normal).unwrap().store(normal_estimate, Ordering::Release);
 152                                 fees.get(&Target::HighPriority)
 153                                         .unwrap()
 154                                         .store(high_prio_estimate, Ordering::Release);
 155                                 tokio::time::sleep(Duration::from_secs(60)).await;
 156                         }
 157                 });
 158         }
 159
 160         pub fn get_new_rpc_client(&self) -> std::io::Result<RpcClient> {
 161                 let http_endpoint = HttpEndpoint::for_host(self.host.clone()).with_port(self.port);
 162                 let rpc_credentials =
 163                         base64::encode(format!("{}:{}", self.rpc_user.clone(), self.rpc_password.clone()));
 164                 RpcClient::new(&rpc_credentials, http_endpoint)
 165         }
 166
 167         pub async fn create_raw_transaction(&self, outputs: Vec<HashMap<String, f64>>) -> RawTx {
 168                 let outputs_json = serde_json::json!(outputs);
 169                 self.bitcoind_rpc_client
 170                         .call_method::<RawTx>(
 171                                 "createrawtransaction",
 172                                 &vec![serde_json::json!([]), outputs_json],
 173                         )
 174                         .await
 175                         .unwrap()
 176         }
 177
 178         pub async fn fund_raw_transaction(&self, raw_tx: RawTx) -> FundedTx {
 179                 let raw_tx_json = serde_json::json!(raw_tx.0);
 180                 let options = serde_json::json!({
 181                         // LDK gives us feerates in satoshis per KW but Bitcoin Core here expects fees
 182                         // denominated in satoshis per vB. First we need to multiply by 4 to convert weight
 183                         // units to virtual bytes, then divide by 1000 to convert KvB to vB.
 184                         "fee_rate": self.get_est_sat_per_1000_weight(ConfirmationTarget::Normal) as f64 / 250.0,
 185                         // While users could "cancel" a channel open by RBF-bumping and paying back to
 186                         // themselves, we don't allow it here as its easy to have users accidentally RBF bump
 187                         // and pay to the channel funding address, which results in loss of funds. Real
 188                         // LDK-based applications should enable RBF bumping and RBF bump either to a local
 189                         // change address or to a new channel output negotiated with the same node.
 190                         "replaceable": false,
 191                 });
 192                 self.bitcoind_rpc_client
 193                         .call_method("fundrawtransaction", &[raw_tx_json, options])
 194                         .await
 195                         .unwrap()
 196         }
 197
 198         pub async fn send_raw_transaction(&self, raw_tx: RawTx) {
 199                 let raw_tx_json = serde_json::json!(raw_tx.0);
 200                 self.bitcoind_rpc_client
 201                         .call_method::<Txid>("sendrawtransaction", &[raw_tx_json])
 202                         .await
 203                         .unwrap();
 204         }
 205
 206         pub async fn sign_raw_transaction_with_wallet(&self, tx_hex: String) -> SignedTx {
 207                 let tx_hex_json = serde_json::json!(tx_hex);
 208                 self.bitcoind_rpc_client
 209                         .call_method("signrawtransactionwithwallet", &vec![tx_hex_json])
 210                         .await
 211                         .unwrap()
 212         }
 213
 214         pub async fn get_new_address(&self) -> Address {
 215                 let addr_args = vec![serde_json::json!("LDK output address")];
 216                 let addr = self
 217                         .bitcoind_rpc_client
 218                         .call_method::<NewAddress>("getnewaddress", &addr_args)
 219                         .await
 220                         .unwrap();
 221                 Address::from_str(addr.0.as_str()).unwrap()
 222         }
 223
 224         pub async fn get_blockchain_info(&self) -> BlockchainInfo {
 225                 self.bitcoind_rpc_client
 226                         .call_method::<BlockchainInfo>("getblockchaininfo", &vec![])
 227                         .await
 228                         .unwrap()
 229         }
 230 }
 231
 232 impl FeeEstimator for BitcoindClient {
 233         fn get_est_sat_per_1000_weight(&self, confirmation_target: ConfirmationTarget) -> u32 {
 234                 match confirmation_target {
 235                         ConfirmationTarget::Background => {
 236                                 self.fees.get(&Target::Background).unwrap().load(Ordering::Acquire)
 237                         }
 238                         ConfirmationTarget::Normal => {
 239                                 self.fees.get(&Target::Normal).unwrap().load(Ordering::Acquire)
 240                         }
 241                         ConfirmationTarget::HighPriority => {
 242                                 self.fees.get(&Target::HighPriority).unwrap().load(Ordering::Acquire)
 243                         }
 244                 }
 245         }
 246 }
 247
 248 impl BroadcasterInterface for BitcoindClient {
 249         fn broadcast_transaction(&self, tx: &Transaction) {
 250                 let bitcoind_rpc_client = self.bitcoind_rpc_client.clone();
 251                 let tx_serialized = serde_json::json!(encode::serialize_hex(tx));
 252                 self.handle.spawn(async move {
 253                         // This may error due to RL calling `broadcast_transaction` with the same transaction
 254                         // multiple times, but the error is safe to ignore.
 255                         match bitcoind_rpc_client
 256                                 .call_method::<Txid>("sendrawtransaction", &vec![tx_serialized])
 257                                 .await
 258                         {
 259                                 Ok(_) => {}
 260                                 Err(e) => {
 261                                         let err_str = e.get_ref().unwrap().to_string();
 262                                         if !err_str.contains("Transaction already in block chain")
 263                                                 && !err_str.contains("Inputs missing or spent")
 264                                                 && !err_str.contains("bad-txns-inputs-missingorspent")
 265                                                 && !err_str.contains("txn-mempool-conflict")
 266                                                 && !err_str.contains("non-BIP68-final")
 267                                                 && !err_str.contains("insufficient fee, rejecting replacement ")
 268                                         {
 269                                                 panic!("{}", e);
 270                                         }
 271                                 }
 272                         }
 273                 });
 274         }
 275 }