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