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

   1 use bitcoin::network::constants::Network;
   2 use bitcoin::hashes::Hash;
   3 use bitcoin::hashes::sha256::Hash as Sha256Hash;
   4 use bitcoin::secp256k1::Secp256k1;
   5 use bitcoin::secp256k1::key::{PublicKey, SecretKey};
   6 use crate::{ChannelManager, FilesystemLogger, HTLCDirection, HTLCStatus,
   7             PaymentInfoStorage, PeerManager, SatoshiAmount};
   8 use crate::disk;
   9 use crate::hex_utils;
  10 use lightning::chain;
  11 use lightning::ln::channelmanager::{PaymentHash, PaymentPreimage, PaymentSecret};
  12 use lightning::ln::features::InvoiceFeatures;
  13 use lightning::routing::network_graph::NetGraphMsgHandler;
  14 use lightning::routing::router;
  15 use lightning::util::config::UserConfig;
  16 use rand;
  17 use rand::Rng;
  18 use std::env;
  19 use std::io;
  20 use std::io::{BufRead, Write};
  21 use std::net::{SocketAddr, TcpStream};
  22 use std::ops::Deref;
  23 use std::path::Path;
  24 use std::str::FromStr;
  25 use std::sync::Arc;
  26 use std::time::Duration;
  27 use tokio::runtime::Handle;
  28 use tokio::sync::mpsc;
  29
  30 pub(crate) struct LdkUserInfo {
  31     pub(crate) bitcoind_rpc_username: String,
  32     pub(crate) bitcoind_rpc_password: String,
  33     pub(crate) bitcoind_rpc_port: u16,
  34     pub(crate) bitcoind_rpc_host: String,
  35     pub(crate) ldk_storage_dir_path: String,
  36     pub(crate) ldk_peer_listening_port: u16,
  37     pub(crate) network: Network,
  38 }
  39
  40 pub(crate) fn parse_startup_args() -> Result<LdkUserInfo, ()> {
  41     if env::args().len() < 4 {
  42         println!("ldk-tutorial-node requires 3 arguments: `cargo run <bitcoind-rpc-username>:<bitcoind-rpc-password>@<bitcoind-rpc-host>:<bitcoind-rpc-port> ldk_storage_directory_path [<ldk-incoming-peer-listening-port>] [bitcoin-network]`");
  43         return Err(())
  44     }
  45     let bitcoind_rpc_info = env::args().skip(1).next().unwrap();
  46     let bitcoind_rpc_info_parts: Vec<&str> = bitcoind_rpc_info.split("@").collect();
  47     if bitcoind_rpc_info_parts.len() != 2 {
  48         println!("ERROR: bad bitcoind RPC URL provided");
  49         return Err(())
  50     }
  51     let rpc_user_and_password: Vec<&str> = bitcoind_rpc_info_parts[0].split(":").collect();
  52     if rpc_user_and_password.len() != 2 {
  53         println!("ERROR: bad bitcoind RPC username/password combo provided");
  54         return Err(())
  55     }
  56     let bitcoind_rpc_username = rpc_user_and_password[0].to_string();
  57     let bitcoind_rpc_password = rpc_user_and_password[1].to_string();
  58     let bitcoind_rpc_path: Vec<&str> = bitcoind_rpc_info_parts[1].split(":").collect();
  59     if bitcoind_rpc_path.len() != 2 {
  60         println!("ERROR: bad bitcoind RPC path provided");
  61         return Err(())
  62     }
  63     let bitcoind_rpc_host = bitcoind_rpc_path[0].to_string();
  64     let bitcoind_rpc_port = bitcoind_rpc_path[1].parse::<u16>().unwrap();
  65
  66     let ldk_storage_dir_path = env::args().skip(2).next().unwrap();
  67
  68     let mut ldk_peer_port_set = true;
  69     let ldk_peer_listening_port: u16 = match env::args().skip(3).next().map(|p| p.parse()) {
  70         Some(Ok(p)) => p,
  71         Some(Err(e)) => panic!(e),
  72         None => {
  73             ldk_peer_port_set = false;
  74             9735
  75         },
  76     };
  77
  78     let arg_idx = match ldk_peer_port_set {
  79         true => 4,
  80         false => 3,
  81     };
  82     let network: Network = match env::args().skip(arg_idx).next().as_ref().map(String::as_str) {
  83         Some("testnet") => Network::Testnet,
  84         Some("regtest") => Network::Regtest,
  85         Some(_) => panic!("Unsupported network provided. Options are: `regtest`, `testnet`"),
  86         None => Network::Testnet
  87     };
  88     Ok(LdkUserInfo {
  89         bitcoind_rpc_username,
  90         bitcoind_rpc_password,
  91         bitcoind_rpc_host,
  92         bitcoind_rpc_port,
  93         ldk_storage_dir_path,
  94         ldk_peer_listening_port,
  95         network,
  96     })
  97 }
  98
  99 pub(crate) fn poll_for_user_input(peer_manager: Arc<PeerManager>, channel_manager:
 100                                   Arc<ChannelManager>, router: Arc<NetGraphMsgHandler<Arc<dyn
 101                                   chain::Access>, Arc<FilesystemLogger>>>, payment_storage:
 102                                   PaymentInfoStorage, node_privkey: SecretKey, event_notifier:
 103                                   mpsc::Sender<()>, ldk_data_dir: String, logger: Arc<FilesystemLogger>,
 104                                   runtime_handle: Handle, network: Network) {
 105     println!("LDK startup successful. To view available commands: \"help\".\nLDK logs are available at <your-supplied-ldk-data-dir-path>/.ldk/logs");
 106     let stdin = io::stdin();
 107     print!("> "); io::stdout().flush().unwrap(); // Without flushing, the `>` doesn't print
 108     for line in stdin.lock().lines() {
 109         let _ = event_notifier.try_send(());
 110         let line = line.unwrap();
 111         let mut words = line.split_whitespace();
 112         if let Some(word) = words.next() {
 113             match word {
 114                 "help" => help(),
 115                 "openchannel" => {
 116                     let peer_pubkey_and_ip_addr = words.next();
 117                     let channel_value_sat = words.next();
 118                     if peer_pubkey_and_ip_addr.is_none() || channel_value_sat.is_none() {
 119                         println!("ERROR: openchannel takes 2 arguments: `openchannel pubkey@host:port channel_amt_satoshis`");
 120                         print!("> "); io::stdout().flush().unwrap(); continue;
 121                     }
 122                     let peer_pubkey_and_ip_addr = peer_pubkey_and_ip_addr.unwrap();
 123                     let (pubkey, peer_addr) = match parse_peer_info(peer_pubkey_and_ip_addr.to_string()) {
 124                         Ok(info) => info,
 125                         Err(e) => {
 126                             println!("{:?}", e.into_inner().unwrap());
 127                             print!("> "); io::stdout().flush().unwrap(); continue;
 128                         }
 129                     };
 130
 131                     let chan_amt_sat: Result<u64, _> = channel_value_sat.unwrap().parse();
 132                     if chan_amt_sat.is_err() {
 133                         println!("ERROR: channel amount must be a number");
 134                         print!("> "); io::stdout().flush().unwrap(); continue;
 135                     }
 136
 137                     if connect_peer_if_necessary(pubkey, peer_addr, peer_manager.clone(),
 138                                                  event_notifier.clone(),
 139                                                  runtime_handle.clone()).is_err() {
 140                         print!("> "); io::stdout().flush().unwrap(); continue;
 141                     };
 142
 143                     if open_channel(pubkey, chan_amt_sat.unwrap(), channel_manager.clone()).is_ok() {
 144                         let peer_data_path = format!("{}/channel_peer_data", ldk_data_dir.clone());
 145                         let _ = disk::persist_channel_peer(Path::new(&peer_data_path), peer_pubkey_and_ip_addr);
 146                     }
 147                 },
 148                 "sendpayment" => {
 149                     let invoice_str = words.next();
 150                     if invoice_str.is_none() {
 151                         println!("ERROR: sendpayment requires an invoice: `sendpayment <invoice>`");
 152                         print!("> "); io::stdout().flush().unwrap(); continue;
 153                     }
 154
 155                     let invoice_res = lightning_invoice::Invoice::from_str(invoice_str.unwrap());
 156                     if invoice_res.is_err() {
 157                         println!("ERROR: invalid invoice: {:?}", invoice_res.unwrap_err());
 158                         print!("> "); io::stdout().flush().unwrap(); continue;
 159                     }
 160                     let invoice = invoice_res.unwrap();
 161
 162                     let amt_pico_btc = invoice.amount_pico_btc();
 163                     if amt_pico_btc.is_none () {
 164                         println!("ERROR: invalid invoice: must contain amount to pay");
 165                         print!("> "); io::stdout().flush().unwrap(); continue;
 166                     }
 167                     let amt_msat = amt_pico_btc.unwrap() / 10;
 168
 169                     let payee_pubkey = invoice.recover_payee_pub_key();
 170                     let final_cltv = *invoice.min_final_cltv_expiry().unwrap_or(&9) as u32;
 171
 172                     let mut payment_hash = PaymentHash([0; 32]);
 173                     payment_hash.0.copy_from_slice(&invoice.payment_hash().as_ref()[0..32]);
 174
 175
 176                     let payment_secret = match invoice.payment_secret() {
 177                         Some(secret) => {
 178                             let mut payment_secret = PaymentSecret([0; 32]);
 179                             payment_secret.0.copy_from_slice(&secret.0);
 180                             Some(payment_secret)
 181                         },
 182                         None => None
 183                     };
 184
 185                     // rust-lightning-invoice doesn't currently support features, so we parse features
 186                     // manually from the invoice.
 187                     let mut invoice_features = InvoiceFeatures::empty();
 188                     for field in &invoice.into_signed_raw().raw_invoice().data.tagged_fields {
 189                         match field {
 190                             lightning_invoice::RawTaggedField::UnknownSemantics(vec) => {
 191                                 if vec[0] == bech32::u5::try_from_u8(5).unwrap() {
 192                                     if vec.len() >= 6 && vec[5].to_u8() & 0b10000 != 0 {
 193                                         invoice_features = invoice_features.set_variable_length_onion_optional();
 194                                     }
 195                                     if vec.len() >= 6 && vec[5].to_u8() & 0b01000 != 0 {
 196                                         invoice_features = invoice_features.set_variable_length_onion_required();
 197                                     }
 198                                     if vec.len() >= 4 && vec[3].to_u8() & 0b00001 != 0 {
 199                                         invoice_features = invoice_features.set_payment_secret_optional();
 200                                     }
 201                                     if vec.len() >= 5 && vec[4].to_u8() & 0b10000 != 0 {
 202                                         invoice_features = invoice_features.set_payment_secret_required();
 203                                     }
 204                                     if vec.len() >= 4 && vec[3].to_u8() & 0b00100 != 0 {
 205                                         invoice_features = invoice_features.set_basic_mpp_optional();
 206                                     }
 207                                     if vec.len() >= 4 && vec[3].to_u8() & 0b00010 != 0 {
 208                                         invoice_features = invoice_features.set_basic_mpp_required();
 209                                     }
 210                                 }
 211                             },
 212                             _ => {}
 213                         }
 214                     }
 215                     let invoice_features_opt = match invoice_features == InvoiceFeatures::empty() {
 216                         true => None,
 217                         false => Some(invoice_features)
 218                     };
 219                     send_payment(payee_pubkey, amt_msat, final_cltv, payment_hash,
 220                                         payment_secret, invoice_features_opt, router.clone(),
 221                                         channel_manager.clone(), payment_storage.clone(),
 222                                         logger.clone());
 223                 },
 224                 "getinvoice" => {
 225                     let amt_str = words.next();
 226                     if amt_str.is_none() {
 227                         println!("ERROR: getinvoice requires an amount in satoshis");
 228                         print!("> "); io::stdout().flush().unwrap(); continue;
 229                     }
 230
 231                     let amt_sat: Result<u64, _> = amt_str.unwrap().parse();
 232                     if amt_sat.is_err() {
 233                         println!("ERROR: getinvoice provided payment amount was not a number");
 234                         print!("> "); io::stdout().flush().unwrap(); continue;
 235                     }
 236                     get_invoice(amt_sat.unwrap(), payment_storage.clone(), node_privkey.clone(),
 237                                 channel_manager.clone(), network);
 238                 },
 239                 "connectpeer" => {
 240                     let peer_pubkey_and_ip_addr = words.next();
 241                     if peer_pubkey_and_ip_addr.is_none() {
 242                         println!("ERROR: connectpeer requires peer connection info: `connectpeer pubkey@host:port`");
 243                         print!("> "); io::stdout().flush().unwrap(); continue;
 244                     }
 245                     let (pubkey, peer_addr) = match parse_peer_info(peer_pubkey_and_ip_addr.unwrap().to_string()) {
 246                         Ok(info) => info,
 247                         Err(e) => {
 248                             println!("{:?}", e.into_inner().unwrap());
 249                             print!("> "); io::stdout().flush().unwrap(); continue;
 250                         }
 251                     };
 252                     if connect_peer_if_necessary(pubkey, peer_addr, peer_manager.clone(),
 253                                                  event_notifier.clone(), runtime_handle.clone()).is_ok() {
 254                         println!("SUCCESS: connected to peer {}", pubkey);
 255                     }
 256
 257                 },
 258                 "listchannels" => list_channels(channel_manager.clone()),
 259                 "listpayments" => list_payments(payment_storage.clone()),
 260                 "closechannel" => {
 261                     let channel_id_str = words.next();
 262                     if channel_id_str.is_none() {
 263                         println!("ERROR: closechannel requires a channel ID: `closechannel <channel_id>`");
 264                         print!("> "); io::stdout().flush().unwrap(); continue;
 265                     }
 266                     let channel_id_vec = hex_utils::to_vec(channel_id_str.unwrap());
 267                     if channel_id_vec.is_none() {
 268                         println!("ERROR: couldn't parse channel_id as hex");
 269                         print!("> "); io::stdout().flush().unwrap(); continue;
 270                     }
 271                     let mut channel_id = [0; 32];
 272                     channel_id.copy_from_slice(&channel_id_vec.unwrap());
 273                     close_channel(channel_id, channel_manager.clone());
 274                 },
 275                 "forceclosechannel" => {
 276                     let channel_id_str = words.next();
 277                     if channel_id_str.is_none() {
 278                         println!("ERROR: forceclosechannel requires a channel ID: `forceclosechannel <channel_id>`");
 279                         print!("> "); io::stdout().flush().unwrap(); continue;
 280                     }
 281                     let channel_id_vec = hex_utils::to_vec(channel_id_str.unwrap());
 282                     if channel_id_vec.is_none() {
 283                         println!("ERROR: couldn't parse channel_id as hex");
 284                         print!("> "); io::stdout().flush().unwrap(); continue;
 285                     }
 286                     let mut channel_id = [0; 32];
 287                     channel_id.copy_from_slice(&channel_id_vec.unwrap());
 288                     force_close_channel(channel_id, channel_manager.clone());
 289                 }
 290                 _ => println!("Unknown command. See `\"help\" for available commands.")
 291             }
 292         }
 293         print!("> "); io::stdout().flush().unwrap();
 294
 295     }
 296 }
 297
 298 fn help() {
 299     println!("openchannel pubkey@host:port <channel_amt_satoshis>");
 300     println!("sendpayment <invoice>");
 301     println!("getinvoice <amt_in_satoshis>");
 302     println!("connectpeer pubkey@host:port");
 303     println!("listchannels");
 304     println!("listpayments");
 305     println!("closechannel <channel_id>");
 306     println!("forceclosechannel <channel_id>");
 307 }
 308
 309 fn list_channels(channel_manager: Arc<ChannelManager>) {
 310     print!("[");
 311     for chan_info in channel_manager.list_channels() {
 312         println!("");
 313         println!("\t{{");
 314         println!("\t\tchannel_id: {},", hex_utils::hex_str(&chan_info.channel_id[..]));
 315         println!("\t\tpeer_pubkey: {},", hex_utils::hex_str(&chan_info.remote_network_id.serialize()));
 316         let mut pending_channel = false;
 317         match chan_info.short_channel_id {
 318             Some(id) => println!("\t\tshort_channel_id: {},", id),
 319             None => {
 320                 pending_channel = true;
 321             }
 322         }
 323         println!("\t\tpending_open: {},", pending_channel);
 324         println!("\t\tchannel_value_satoshis: {},", chan_info.channel_value_satoshis);
 325         println!("\t\tchannel_can_send_payments: {},", chan_info.is_live);
 326         println!("\t}},");
 327     }
 328     println!("]");
 329 }
 330
 331 fn list_payments(payment_storage: PaymentInfoStorage) {
 332     let payments = payment_storage.lock().unwrap();
 333     print!("[");
 334     for (payment_hash, payment_info) in payments.deref() {
 335         let direction_str = match payment_info.1 {
 336             HTLCDirection::Inbound => "inbound",
 337             HTLCDirection::Outbound => "outbound",
 338         };
 339         println!("");
 340         println!("\t{{");
 341         println!("\t\tamount_satoshis: {},", payment_info.3);
 342         println!("\t\tpayment_hash: {},", hex_utils::hex_str(&payment_hash.0));
 343         println!("\t\thtlc_direction: {},", direction_str);
 344         println!("\t\thtlc_status: {},", match payment_info.2 {
 345             HTLCStatus::Pending => "pending",
 346             HTLCStatus::Succeeded => "succeeded",
 347             HTLCStatus::Failed => "failed"
 348         });
 349
 350
 351         println!("\t}},");
 352     }
 353     println!("]");
 354 }
 355
 356 pub(crate) fn connect_peer_if_necessary(pubkey: PublicKey, peer_addr: SocketAddr, peer_manager:
 357                              Arc<PeerManager>, event_notifier: mpsc::Sender<()>, runtime: Handle) ->
 358                              Result<(), ()> {
 359     for node_pubkey in peer_manager.get_peer_node_ids() {
 360         if node_pubkey == pubkey {
 361             return Ok(())
 362         }
 363     }
 364     match TcpStream::connect_timeout(&peer_addr, Duration::from_secs(10)) {
 365         Ok(stream) => {
 366             let peer_mgr = peer_manager.clone();
 367             let event_ntfns = event_notifier.clone();
 368             runtime.spawn(async move {
 369                 lightning_net_tokio::setup_outbound(peer_mgr, event_ntfns, pubkey, stream).await;
 370             });
 371             let mut peer_connected = false;
 372             while !peer_connected {
 373                 for node_pubkey in peer_manager.get_peer_node_ids() {
 374                     if node_pubkey == pubkey { peer_connected = true; }
 375                 }
 376             }
 377         },
 378         Err(e) => {println!("ERROR: failed to connect to peer: {:?}", e);
 379             return Err(())
 380         }
 381     }
 382     Ok(())
 383 }
 384
 385 fn open_channel(peer_pubkey: PublicKey, channel_amt_sat: u64, channel_manager: Arc<ChannelManager>)
 386                        -> Result<(), ()> {
 387     let mut config = UserConfig::default();
 388     // lnd's max to_self_delay is 2016, so we want to be compatible.
 389     config.peer_channel_config_limits.their_to_self_delay = 2016;
 390     match channel_manager.create_channel(peer_pubkey, channel_amt_sat, 0, 0, None) {
 391         Ok(_) => {
 392             println!("EVENT: initiated channel with peer {}. ", peer_pubkey);
 393             return Ok(())
 394         },
 395         Err(e) => {
 396             println!("ERROR: failed to open channel: {:?}", e);
 397             return Err(())
 398         }
 399     }
 400 }
 401
 402 fn send_payment(payee: PublicKey, amt_msat: u64, final_cltv: u32, payment_hash: PaymentHash,
 403                 payment_secret: Option<PaymentSecret>, payee_features: Option<InvoiceFeatures>,
 404                 router: Arc<NetGraphMsgHandler<Arc<dyn chain::Access>, Arc<FilesystemLogger>>>,
 405                 channel_manager: Arc<ChannelManager>, payment_storage: PaymentInfoStorage, logger:
 406                 Arc<FilesystemLogger>) {
 407     let network_graph = router.network_graph.read().unwrap();
 408     let first_hops = channel_manager.list_usable_channels();
 409     let payer_pubkey = channel_manager.get_our_node_id();
 410
 411     let route = router::get_route(&payer_pubkey, &network_graph, &payee, payee_features,
 412                                  Some(&first_hops.iter().collect::<Vec<_>>()), &vec![], amt_msat,
 413                                  final_cltv, logger);
 414     if let Err(e) = route {
 415         println!("ERROR: failed to find route: {}", e.err);
 416         return
 417     }
 418     let status = match channel_manager.send_payment(&route.unwrap(), payment_hash, &payment_secret) {
 419         Ok(()) => {
 420             println!("EVENT: initiated sending {} msats to {}", amt_msat, payee);
 421             HTLCStatus::Pending
 422         },
 423         Err(e) => {
 424             println!("ERROR: failed to send payment: {:?}", e);
 425             HTLCStatus::Failed
 426         }
 427     };
 428     let mut payments = payment_storage.lock().unwrap();
 429     payments.insert(payment_hash, (None, HTLCDirection::Outbound, status,
 430                                    SatoshiAmount(Some(amt_msat * 1000))));
 431 }
 432
 433 fn get_invoice(amt_sat: u64, payment_storage: PaymentInfoStorage, our_node_privkey: SecretKey,
 434                channel_manager: Arc<ChannelManager>, network: Network) {
 435     let mut payments = payment_storage.lock().unwrap();
 436     let secp_ctx = Secp256k1::new();
 437
 438     let mut preimage = [0; 32];
 439                 rand::thread_rng().fill_bytes(&mut preimage);
 440                 let payment_hash = Sha256Hash::hash(&preimage);
 441
 442
 443     let our_node_pubkey = channel_manager.get_our_node_id();
 444                 let mut invoice = lightning_invoice::InvoiceBuilder::new(match network {
 445                                 Network::Bitcoin => lightning_invoice::Currency::Bitcoin,
 446                                 Network::Testnet => lightning_invoice::Currency::BitcoinTestnet,
 447                                 Network::Regtest => lightning_invoice::Currency::Regtest,
 448         Network::Signet => panic!("Signet invoices not supported")
 449                 })
 450         .payment_hash(payment_hash).description("rust-lightning-bitcoinrpc invoice".to_string())
 451                                 .amount_pico_btc(amt_sat * 10_000)
 452                                 .current_timestamp()
 453         .payee_pub_key(our_node_pubkey);
 454
 455     // Add route hints to the invoice.
 456     let our_channels = channel_manager.list_usable_channels();
 457     for channel in our_channels {
 458         let short_channel_id = match channel.short_channel_id {
 459             Some(id) => id.to_be_bytes(),
 460             None => continue
 461         };
 462         let forwarding_info = match channel.counterparty_forwarding_info {
 463             Some(info) => info,
 464             None => continue,
 465         };
 466         println!("VMW: adding routehop, info.fee base: {}", forwarding_info.fee_base_msat);
 467         invoice = invoice.route(vec![
 468             lightning_invoice::RouteHop {
 469                 pubkey: channel.remote_network_id,
 470                 short_channel_id,
 471                 fee_base_msat: forwarding_info.fee_base_msat,
 472                 fee_proportional_millionths: forwarding_info.fee_proportional_millionths,
 473                 cltv_expiry_delta: forwarding_info.cltv_expiry_delta,
 474             }
 475         ]);
 476     }
 477
 478     // Sign the invoice.
 479     let invoice = invoice.build_signed(|msg_hash| {
 480         secp_ctx.sign_recoverable(msg_hash, &our_node_privkey)
 481                 });
 482
 483                 match invoice {
 484                                 Ok(invoice) => println!("SUCCESS: generated invoice: {}", invoice),
 485                                 Err(e) => println!("ERROR: failed to create invoice: {:?}", e),
 486                 }
 487
 488     payments.insert(PaymentHash(payment_hash.into_inner()), (Some(PaymentPreimage(preimage)),
 489                                                              HTLCDirection::Inbound,
 490                                                              HTLCStatus::Pending,
 491                                                              SatoshiAmount(Some(amt_sat))));
 492 }
 493
 494 fn close_channel(channel_id: [u8; 32], channel_manager: Arc<ChannelManager>) {
 495     match channel_manager.close_channel(&channel_id) {
 496         Ok(()) => println!("EVENT: initiating channel close"),
 497         Err(e) => println!("ERROR: failed to close channel: {:?}", e)
 498     }
 499 }
 500
 501 fn force_close_channel(channel_id: [u8; 32], channel_manager: Arc<ChannelManager>) {
 502     match channel_manager.force_close_channel(&channel_id) {
 503         Ok(()) => println!("EVENT: initiating channel force-close"),
 504         Err(e) => println!("ERROR: failed to force-close channel: {:?}", e)
 505     }
 506 }
 507
 508 pub(crate) fn parse_peer_info(peer_pubkey_and_ip_addr: String) -> Result<(PublicKey, SocketAddr), std::io::Error> {
 509     let mut pubkey_and_addr = peer_pubkey_and_ip_addr.split("@");
 510     let pubkey = pubkey_and_addr.next();
 511     let peer_addr_str = pubkey_and_addr.next();
 512     if peer_addr_str.is_none() || peer_addr_str.is_none() {
 513         return Err(std::io::Error::new(std::io::ErrorKind::Other, "ERROR: incorrectly formatted peer
 514         info. Should be formatted as: `pubkey@host:port`"));
 515     }
 516
 517     let peer_addr: Result<SocketAddr, _> = peer_addr_str.unwrap().parse();
 518     if peer_addr.is_err() {
 519         return Err(std::io::Error::new(std::io::ErrorKind::Other, "ERROR: couldn't parse pubkey@host:port into a socket address"));
 520     }
 521
 522     let pubkey = hex_utils::to_compressed_pubkey(pubkey.unwrap());
 523     if pubkey.is_none() {
 524         return Err(std::io::Error::new(std::io::ErrorKind::Other, "ERROR: unable to parse given pubkey for node"));
 525     }
 526
 527     Ok((pubkey.unwrap(), peer_addr.unwrap()))
 528 }