|
| 1 | +use std::time::Duration; |
| 2 | + |
| 3 | +use acropolis_common::{BlockHash, Era}; |
| 4 | +use anyhow::{Result, bail}; |
| 5 | +pub use pallas::network::miniprotocols::Point; |
| 6 | +use pallas::{ |
| 7 | + ledger::traverse::MultiEraHeader, |
| 8 | + network::{ |
| 9 | + facades::PeerClient, |
| 10 | + miniprotocols::{blockfetch, chainsync}, |
| 11 | + }, |
| 12 | +}; |
| 13 | +use tokio::{ |
| 14 | + select, |
| 15 | + sync::{mpsc, oneshot}, |
| 16 | +}; |
| 17 | +use tracing::error; |
| 18 | + |
| 19 | +use crate::network::PeerMessageSender; |
| 20 | + |
| 21 | +pub struct PeerConnection { |
| 22 | + pub address: String, |
| 23 | + chainsync: mpsc::Sender<ChainsyncCommand>, |
| 24 | + blockfetch: mpsc::Sender<BlockfetchCommand>, |
| 25 | +} |
| 26 | + |
| 27 | +impl PeerConnection { |
| 28 | + pub fn new(address: String, magic: u64, sender: PeerMessageSender, delay: Duration) -> Self { |
| 29 | + let worker = PeerConnectionWorker { |
| 30 | + address: address.clone(), |
| 31 | + magic, |
| 32 | + sender, |
| 33 | + }; |
| 34 | + let (chainsync_tx, chainsync_rx) = mpsc::channel(16); |
| 35 | + let (blockfetch_tx, blockfetch_rx) = mpsc::channel(16); |
| 36 | + tokio::spawn(async move { |
| 37 | + tokio::time::sleep(delay).await; |
| 38 | + worker.run(chainsync_rx, blockfetch_rx).await; |
| 39 | + }); |
| 40 | + Self { |
| 41 | + address, |
| 42 | + chainsync: chainsync_tx, |
| 43 | + blockfetch: blockfetch_tx, |
| 44 | + } |
| 45 | + } |
| 46 | + |
| 47 | + pub async fn find_tip(&self) -> Result<Point> { |
| 48 | + let (tx, rx) = oneshot::channel(); |
| 49 | + self.chainsync.send(ChainsyncCommand::FindTip(tx)).await?; |
| 50 | + Ok(rx.await?) |
| 51 | + } |
| 52 | + |
| 53 | + pub async fn find_intersect(&self, points: Vec<Point>) -> Result<()> { |
| 54 | + self.chainsync.send(ChainsyncCommand::FindIntersect(points)).await?; |
| 55 | + Ok(()) |
| 56 | + } |
| 57 | + |
| 58 | + pub async fn request_block(&self, hash: BlockHash, height: u64) -> Result<()> { |
| 59 | + self.blockfetch.send(BlockfetchCommand::Fetch(hash, height)).await?; |
| 60 | + Ok(()) |
| 61 | + } |
| 62 | +} |
| 63 | + |
| 64 | +pub enum PeerEvent { |
| 65 | + ChainSync(PeerChainSyncEvent), |
| 66 | + BlockFetched(BlockFetched), |
| 67 | + Disconnected, |
| 68 | +} |
| 69 | + |
| 70 | +pub enum PeerChainSyncEvent { |
| 71 | + RollForward(Header), |
| 72 | + RollBackward(Point), |
| 73 | +} |
| 74 | + |
| 75 | +#[derive(Clone)] |
| 76 | +pub struct Header { |
| 77 | + pub hash: BlockHash, |
| 78 | + pub slot: u64, |
| 79 | + pub number: u64, |
| 80 | + pub bytes: Vec<u8>, |
| 81 | + pub era: Era, |
| 82 | +} |
| 83 | + |
| 84 | +pub struct BlockFetched { |
| 85 | + pub hash: BlockHash, |
| 86 | + pub body: Vec<u8>, |
| 87 | +} |
| 88 | + |
| 89 | +struct PeerConnectionWorker { |
| 90 | + address: String, |
| 91 | + magic: u64, |
| 92 | + sender: PeerMessageSender, |
| 93 | +} |
| 94 | + |
| 95 | +impl PeerConnectionWorker { |
| 96 | + async fn run( |
| 97 | + mut self, |
| 98 | + chainsync: mpsc::Receiver<ChainsyncCommand>, |
| 99 | + blockfetch: mpsc::Receiver<BlockfetchCommand>, |
| 100 | + ) { |
| 101 | + if let Err(err) = self.do_run(chainsync, blockfetch).await { |
| 102 | + error!(peer = self.address, "{err:#}"); |
| 103 | + } |
| 104 | + let _ = self.sender.write(PeerEvent::Disconnected).await; |
| 105 | + } |
| 106 | + |
| 107 | + async fn do_run( |
| 108 | + &mut self, |
| 109 | + chainsync: mpsc::Receiver<ChainsyncCommand>, |
| 110 | + blockfetch: mpsc::Receiver<BlockfetchCommand>, |
| 111 | + ) -> Result<()> { |
| 112 | + let client = PeerClient::connect(self.address.clone(), self.magic).await?; |
| 113 | + select! { |
| 114 | + res = self.run_chainsync(client.chainsync, chainsync) => res, |
| 115 | + res = self.run_blockfetch(client.blockfetch, blockfetch) => res, |
| 116 | + } |
| 117 | + } |
| 118 | + |
| 119 | + async fn run_chainsync( |
| 120 | + &self, |
| 121 | + mut client: chainsync::N2NClient, |
| 122 | + mut commands: mpsc::Receiver<ChainsyncCommand>, |
| 123 | + ) -> Result<()> { |
| 124 | + let mut reached = None; |
| 125 | + loop { |
| 126 | + select! { |
| 127 | + msg = client.request_or_await_next(), if reached.is_some() => { |
| 128 | + if let Some(parsed) = self.parse_chainsync_message(msg?)? { |
| 129 | + reached = Some(parsed.point); |
| 130 | + self.sender.write(PeerEvent::ChainSync(parsed.event)).await?; |
| 131 | + } |
| 132 | + } |
| 133 | + cmd = commands.recv() => { |
| 134 | + let Some(cmd) = cmd else { |
| 135 | + bail!("parent process has disconnected"); |
| 136 | + }; |
| 137 | + match cmd { |
| 138 | + ChainsyncCommand::FindIntersect(points) => { |
| 139 | + let (point, _) = client.find_intersect(points).await?; |
| 140 | + reached = point; |
| 141 | + } |
| 142 | + ChainsyncCommand::FindTip(done) => { |
| 143 | + let points = reached.as_slice().to_vec(); |
| 144 | + let (_, tip) = client.find_intersect(points).await?; |
| 145 | + if done.send(tip.0).is_err() { |
| 146 | + bail!("parent process has disconnected"); |
| 147 | + } |
| 148 | + } |
| 149 | + } |
| 150 | + } |
| 151 | + } |
| 152 | + } |
| 153 | + } |
| 154 | + |
| 155 | + async fn run_blockfetch( |
| 156 | + &self, |
| 157 | + mut client: blockfetch::Client, |
| 158 | + mut commands: mpsc::Receiver<BlockfetchCommand>, |
| 159 | + ) -> Result<()> { |
| 160 | + while let Some(BlockfetchCommand::Fetch(hash, height)) = commands.recv().await { |
| 161 | + let point = Point::Specific(height, hash.to_vec()); |
| 162 | + let body = client.fetch_single(point).await?; |
| 163 | + self.sender.write(PeerEvent::BlockFetched(BlockFetched { hash, body })).await?; |
| 164 | + } |
| 165 | + bail!("parent process has disconnected"); |
| 166 | + } |
| 167 | + |
| 168 | + fn parse_chainsync_message( |
| 169 | + &self, |
| 170 | + msg: chainsync::NextResponse<chainsync::HeaderContent>, |
| 171 | + ) -> Result<Option<ParsedChainsyncMessage>> { |
| 172 | + match msg { |
| 173 | + chainsync::NextResponse::RollForward(header, _) => { |
| 174 | + let Some(parsed) = self.parse_header(header)? else { |
| 175 | + return Ok(None); |
| 176 | + }; |
| 177 | + let point = Point::Specific(parsed.number, parsed.hash.to_vec()); |
| 178 | + Ok(Some(ParsedChainsyncMessage { |
| 179 | + point, |
| 180 | + event: PeerChainSyncEvent::RollForward(parsed), |
| 181 | + })) |
| 182 | + } |
| 183 | + chainsync::NextResponse::RollBackward(point, _) => Ok(Some(ParsedChainsyncMessage { |
| 184 | + point: point.clone(), |
| 185 | + event: PeerChainSyncEvent::RollBackward(point), |
| 186 | + })), |
| 187 | + chainsync::NextResponse::Await => Ok(None), |
| 188 | + } |
| 189 | + } |
| 190 | + |
| 191 | + fn parse_header(&self, header: chainsync::HeaderContent) -> Result<Option<Header>> { |
| 192 | + let hdr_tag = header.byron_prefix.map(|p| p.0); |
| 193 | + let hdr_variant = header.variant; |
| 194 | + let hdr = MultiEraHeader::decode(hdr_variant, hdr_tag, &header.cbor)?; |
| 195 | + let era = match hdr { |
| 196 | + MultiEraHeader::EpochBoundary(_) => return Ok(None), |
| 197 | + MultiEraHeader::Byron(_) => Era::Byron, |
| 198 | + MultiEraHeader::ShelleyCompatible(_) => match hdr_variant { |
| 199 | + 1 => Era::Shelley, |
| 200 | + 2 => Era::Allegra, |
| 201 | + 3 => Era::Mary, |
| 202 | + 4 => Era::Alonzo, |
| 203 | + x => bail!("Impossible header variant {x} for ShelleyCompatible (TPraos)"), |
| 204 | + }, |
| 205 | + MultiEraHeader::BabbageCompatible(_) => match hdr_variant { |
| 206 | + 5 => Era::Babbage, |
| 207 | + 6 => Era::Conway, |
| 208 | + x => bail!("Impossible header variant {x} for BabbageCompatible (Praos)"), |
| 209 | + }, |
| 210 | + }; |
| 211 | + Ok(Some(Header { |
| 212 | + hash: BlockHash::new(*hdr.hash()), |
| 213 | + slot: hdr.slot(), |
| 214 | + number: hdr.number(), |
| 215 | + bytes: header.cbor, |
| 216 | + era, |
| 217 | + })) |
| 218 | + } |
| 219 | +} |
| 220 | + |
| 221 | +enum ChainsyncCommand { |
| 222 | + FindIntersect(Vec<Point>), |
| 223 | + FindTip(oneshot::Sender<Point>), |
| 224 | +} |
| 225 | + |
| 226 | +struct ParsedChainsyncMessage { |
| 227 | + point: Point, |
| 228 | + event: PeerChainSyncEvent, |
| 229 | +} |
| 230 | + |
| 231 | +enum BlockfetchCommand { |
| 232 | + Fetch(BlockHash, u64), |
| 233 | +} |
0 commit comments