217 lines
6.9 KiB
Rust
217 lines
6.9 KiB
Rust
//! `connect` subcommand - test stub for talking to zcashd
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use crate::{components::tokio::TokioComponent, prelude::*};
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use abscissa_core::{Command, Options, Runnable};
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use color_eyre::eyre::{eyre, Report, WrapErr};
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use futures::{
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prelude::*,
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stream::{FuturesUnordered, StreamExt},
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};
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use std::collections::BTreeSet;
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use tower::{buffer::Buffer, service_fn, Service, ServiceExt};
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use zebra_chain::{block::BlockHeaderHash, types::BlockHeight};
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// genesis
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static GENESIS: BlockHeaderHash = BlockHeaderHash([
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8, 206, 61, 151, 49, 176, 0, 192, 131, 56, 69, 92, 138, 74, 107, 208, 93, 161, 110, 38, 177,
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29, 170, 27, 145, 113, 132, 236, 232, 15, 4, 0,
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]);
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/// `connect` subcommand
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#[derive(Command, Debug, Options)]
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pub struct ConnectCmd {
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/// The address of the node to connect to.
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#[options(
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help = "The address of the node to connect to.",
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default = "127.0.0.1:8233"
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)]
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addr: std::net::SocketAddr,
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}
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impl Runnable for ConnectCmd {
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/// Start the application.
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fn run(&self) {
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info!(connect.addr = ?self.addr);
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let rt = app_writer()
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.state_mut()
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.components
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.get_downcast_mut::<TokioComponent>()
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.expect("TokioComponent should be available")
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.rt
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.take();
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let result = rt
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.expect("runtime should not already be taken")
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.block_on(self.connect());
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match result {
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Ok(()) => {}
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Err(e) => {
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eprintln!("Error: {:?}", e);
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std::process::exit(1);
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}
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}
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}
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}
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impl ConnectCmd {
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async fn connect(&self) -> Result<(), Report> {
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info!(?self, "begin tower-based peer handling test stub");
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// The service that our node uses to respond to requests by peers
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let node = Buffer::new(
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service_fn(|req| async move {
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info!(?req);
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Ok::<zebra_network::Response, Report>(zebra_network::Response::Nil)
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}),
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1,
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);
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let mut config = app_config().network.clone();
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// Use a different listen addr so that we don't conflict with another local node.
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config.listen_addr = "0.0.0.0:38233".parse()?;
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// Connect only to the specified peer.
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config.initial_mainnet_peers.insert(self.addr.to_string());
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let state = zebra_state::in_memory::init();
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let (peer_set, _address_book) = zebra_network::init(config, node).await;
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let retry_peer_set = tower::retry::Retry::new(zebra_network::RetryErrors, peer_set.clone());
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let mut downloaded_block_heights = BTreeSet::<BlockHeight>::new();
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downloaded_block_heights.insert(BlockHeight(0));
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let mut connect = Connect {
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retry_peer_set,
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peer_set,
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state,
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tip: GENESIS,
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block_requests: FuturesUnordered::new(),
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requested_block_heights: 0,
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downloaded_block_heights,
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};
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connect.connect().await
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}
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}
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type Error = Box<dyn std::error::Error + Send + Sync + 'static>;
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struct Connect<ZN, ZS>
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where
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ZN: Service<zebra_network::Request>,
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{
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retry_peer_set: tower::retry::Retry<zebra_network::RetryErrors, ZN>,
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peer_set: ZN,
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state: ZS,
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tip: BlockHeaderHash,
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block_requests: FuturesUnordered<ZN::Future>,
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requested_block_heights: usize,
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downloaded_block_heights: BTreeSet<BlockHeight>,
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}
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impl<ZN, ZS> Connect<ZN, ZS>
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where
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ZN: Service<zebra_network::Request, Response = zebra_network::Response, Error = Error>
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+ Send
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+ Clone
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+ 'static,
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ZN::Future: Send,
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ZS: Service<zebra_state::Request, Response = zebra_state::Response, Error = Error>
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+ Send
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+ Clone
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+ 'static,
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ZS::Future: Send,
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{
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async fn connect(&mut self) -> Result<(), Report> {
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// TODO(jlusby): Replace with real state service
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while self.requested_block_heights < 700_000 {
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let hashes = self.next_hashes().await?;
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self.tip = *hashes.last().unwrap();
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// Request the corresponding blocks in chunks
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self.request_blocks(hashes).await?;
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// Allow at most 300 block requests in flight.
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self.drain_requests(300).await?;
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}
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self.drain_requests(0).await?;
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let eternity = future::pending::<()>();
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eternity.await;
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Ok(())
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}
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async fn next_hashes(&mut self) -> Result<Vec<BlockHeaderHash>, Report> {
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// Request the next 500 hashes.
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self.retry_peer_set
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.ready_and()
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.await
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.map_err(|e| eyre!(e))?
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.call(zebra_network::Request::FindBlocks {
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known_blocks: vec![self.tip],
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stop: None,
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})
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.await
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.map_err(|e| eyre!(e))
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.wrap_err("request failed, TODO implement retry")
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.map(|response| match response {
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zebra_network::Response::BlockHeaderHashes(hashes) => hashes,
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_ => unreachable!("FindBlocks always gets a BlockHeaderHashes response"),
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})
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.map(|hashes| {
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info!(
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new_hashes = hashes.len(),
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requested = self.requested_block_heights,
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in_flight = self.block_requests.len(),
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downloaded = self.downloaded_block_heights.len(),
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highest = self.downloaded_block_heights.iter().next_back().unwrap().0,
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"requested more hashes"
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);
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self.requested_block_heights += hashes.len();
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hashes
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})
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}
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async fn request_blocks(&mut self, hashes: Vec<BlockHeaderHash>) -> Result<(), Report> {
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for chunk in hashes.chunks(10usize) {
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let request = self.peer_set.ready_and().await.map_err(|e| eyre!(e))?.call(
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zebra_network::Request::BlocksByHash(chunk.iter().cloned().collect()),
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);
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self.block_requests.push(request);
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}
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Ok(())
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}
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async fn drain_requests(&mut self, request_goal: usize) -> Result<(), Report> {
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while self.block_requests.len() > request_goal {
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match self.block_requests.next().await {
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Some(Ok(zebra_network::Response::Blocks(blocks))) => {
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for block in blocks {
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self.downloaded_block_heights
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.insert(block.coinbase_height().unwrap());
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self.state
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.ready_and()
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.await
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.map_err(|e| eyre!(e))?
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.call(zebra_state::Request::AddBlock { block })
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.await
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.map_err(|e| eyre!(e))?;
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}
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}
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Some(Err(e)) => {
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error!(%e);
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}
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_ => continue,
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}
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}
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Ok(())
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}
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}
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