20166106361

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/base_layer/core/src/base_node/sync/block_sync/synchronizer.rs

//  Copyright 2020, The Tari Project
//
//  Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
//  following conditions are met:
//
//  1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
//  disclaimer.
//
//  2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
//  following disclaimer in the documentation and/or other materials provided with the distribution.
//
//  3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote
//  products derived from this software without specific prior written permission.
//
//  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
//  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
//  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
//  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
//  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
//  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
//  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

use std::{
    convert::{TryFrom, TryInto},
    sync::Arc,
    time::{Duration, Instant},
};

use futures::StreamExt;
use log::*;
use tari_comms::{connectivity::ConnectivityRequester, peer_manager::NodeId, protocol::rpc::RpcClient, PeerConnection};
use tari_node_components::blocks::{Block, ChainBlock};
use tari_transaction_components::{aggregated_body::AggregateBody, BanPeriod};
use tari_utilities::hex::Hex;

use super::error::BlockSyncError;
use crate::{
    base_node::{
        sync::{ban::PeerBanManager, hooks::Hooks, rpc, SyncPeer},
        BlockchainSyncConfig,
    },
    chain_storage::{async_db::AsyncBlockchainDb, BlockchainBackend},
    common::rolling_avg::RollingAverageTime,
    proto::base_node::SyncBlocksRequest,
    validation::{BlockBodyValidator, ValidationError},
};
const LOG_TARGET: &str = "c::bn::block_sync";

const MAX_LATENCY_INCREASES: usize = 5;

pub struct BlockSynchronizer<'a, B> {
    config: BlockchainSyncConfig,
    db: AsyncBlockchainDb<B>,
    connectivity: ConnectivityRequester,
    sync_peers: &'a mut Vec<SyncPeer>,
    block_validator: Arc<dyn BlockBodyValidator<B>>,
    hooks: Hooks,
    peer_ban_manager: PeerBanManager,
}

impl<'a, B: BlockchainBackend + 'static> BlockSynchronizer<'a, B> {
    pub fn new(
        config: BlockchainSyncConfig,
        db: AsyncBlockchainDb<B>,
        connectivity: ConnectivityRequester,
        sync_peers: &'a mut Vec<SyncPeer>,
        block_validator: Arc<dyn BlockBodyValidator<B>>,
    ) -> Self {
        let peer_ban_manager = PeerBanManager::new(config.clone(), connectivity.clone());
        Self {
            config,
            db,
            connectivity,
            sync_peers,
            block_validator,
            hooks: Default::default(),
            peer_ban_manager,
        }
    }

    pub fn on_starting<H>(&mut self, hook: H)
    where for<'r> H: FnOnce(&SyncPeer) + Send + Sync + 'static {
        self.hooks.add_on_starting_hook(hook);
    }

    pub fn on_progress<H>(&mut self, hook: H)
    where H: Fn(Arc<ChainBlock>, u64, &SyncPeer) + Send + Sync + 'static {
        self.hooks.add_on_progress_block_hook(hook);
    }

    pub fn on_complete<H>(&mut self, hook: H)
    where H: Fn(Arc<ChainBlock>, u64) + Send + Sync + 'static {
        self.hooks.add_on_complete_hook(hook);
    }

    pub async fn synchronize(&mut self) -> Result<(), BlockSyncError> {
        let mut max_latency = self.config.initial_max_sync_latency;
        let mut sync_round = 0;
        let mut latency_increases_counter = 0;
        loop {
            match self.attempt_block_sync(max_latency).await {
                Ok(_) => return Ok(()),
                Err(err @ BlockSyncError::AllSyncPeersExceedLatency) => {
                    warn!(target: LOG_TARGET, "{err}");
                    max_latency += self.config.max_latency_increase;
                    warn!(
                        target: LOG_TARGET,
                        "Retrying block sync with increased max latency {:.2?} with {} sync peers",
                        max_latency,
                        self.sync_peers.len()
                    );
                    latency_increases_counter += 1;
                    if latency_increases_counter > MAX_LATENCY_INCREASES {
                        return Err(err);
                    }
                    // Prohibit using a few slow sync peers only, rather get new sync peers assigned
                    if self.sync_peers.len() < 2 {
                        return Err(err);
                    } else {
                        continue;
                    }
                },
                Err(err @ BlockSyncError::SyncRoundFailed) => {
                    sync_round += 1;
                    warn!(target: LOG_TARGET, "{err} ({sync_round})");
                    continue;
                },
                Err(err) => {
                    return Err(err);
                },
            }
        }
    }

    async fn attempt_block_sync(&mut self, max_latency: Duration) -> Result<(), BlockSyncError> {
        let sync_peer_node_ids = self.sync_peers.iter().map(|p| p.node_id()).cloned().collect::<Vec<_>>();
        info!(
            target: LOG_TARGET,
            "Attempting to sync blocks({} sync peers)",
            sync_peer_node_ids.len()
        );
        let mut latency_counter = 0usize;
        for node_id in sync_peer_node_ids {
            let peer_index = self.get_sync_peer_index(&node_id).ok_or(BlockSyncError::PeerNotFound)?;
            let sync_peer = self.sync_peers.get(peer_index).expect("Already checked");
            self.hooks.call_on_starting_hook(sync_peer);
            let mut conn = match self.connect_to_sync_peer(node_id.clone()).await {
                Ok(val) => val,
                Err(e) => {
                    warn!(
                        target: LOG_TARGET,
                        "Failed to connect to sync peer `{node_id}`: {e}"
                    );
                    self.remove_sync_peer(&node_id);
                    continue;
                },
            };
            let config = RpcClient::builder()
                .with_deadline(self.config.rpc_deadline)
                .with_deadline_grace_period(Duration::from_secs(5));
            let mut client = match conn
                .connect_rpc_using_builder::<rpc::BaseNodeSyncRpcClient>(config)
                .await
            {
                Ok(val) => val,
                Err(e) => {
                    warn!(
                        target: LOG_TARGET,
                        "Failed to obtain RPC connection from sync peer `{node_id}`: {e}"
                    );
                    self.remove_sync_peer(&node_id);
                    continue;
                },
            };
            let latency = client
                .get_last_request_latency()
                .expect("unreachable panic: last request latency must be set after connect");
            self.sync_peers
                .get_mut(peer_index)
                .expect("Already checked")
                .set_latency(latency);
            let sync_peer = self.sync_peers.get(peer_index).expect("Already checked").clone();
            info!(
                target: LOG_TARGET,
                "Attempting to synchronize blocks with `{node_id}` latency: {latency:.2?}"
            );
            match self.synchronize_blocks(sync_peer, client, max_latency).await {
                Ok(_) => return Ok(()),
                Err(err) => {
                    warn!(target: LOG_TARGET, "{err}");
                    let ban_reason = BlockSyncError::get_ban_reason(&err);
                    if let Some(reason) = ban_reason {
                        let duration = match reason.ban_duration {
                            BanPeriod::Short => self.config.short_ban_period,
                            BanPeriod::Long => self.config.ban_period,
                        };
                        self.peer_ban_manager
                            .ban_peer_if_required(&node_id, reason.reason, duration)
                            .await;
                    }
                    if let BlockSyncError::MaxLatencyExceeded { .. } = err {
                        latency_counter += 1;
                    } else {
                        self.remove_sync_peer(&node_id);
                    }
                },
            }
        }

        if self.sync_peers.is_empty() {
            Err(BlockSyncError::NoMoreSyncPeers("Block sync failed".to_string()))
        } else if latency_counter >= self.sync_peers.len() {
            Err(BlockSyncError::AllSyncPeersExceedLatency)
        } else {
            Err(BlockSyncError::SyncRoundFailed)
        }
    }

    async fn connect_to_sync_peer(&self, peer: NodeId) -> Result<PeerConnection, BlockSyncError> {
        let connection = self.connectivity.dial_peer(peer).await?;
        Ok(connection)
    }

    #[allow(clippy::too_many_lines)]
    async fn synchronize_blocks(
        &mut self,
        mut sync_peer: SyncPeer,
        mut client: rpc::BaseNodeSyncRpcClient,
        max_latency: Duration,
    ) -> Result<(), BlockSyncError> {
        info!(target: LOG_TARGET, "Starting block sync from peer {}", sync_peer.node_id());

        let tip_header = self.db.fetch_last_header().await?;
        let local_metadata = self.db.get_chain_metadata().await?;

        if tip_header.height <= local_metadata.best_block_height() {
            debug!(
                target: LOG_TARGET,
                "Blocks already synchronized to height {}.", tip_header.height
            );
            return Ok(());
        }

        let tip_hash = tip_header.hash();
        let tip_height = tip_header.height;
        let best_height = local_metadata.best_block_height();
        let chain_header = self.db.fetch_chain_header(best_height).await?;

        let best_full_block_hash = chain_header.accumulated_data().hash;
        debug!(
            target: LOG_TARGET,
            "Starting block sync from peer `{}`. Current best block is #{} `{}`. Syncing to #{} ({}).",
            sync_peer,
            best_height,
            best_full_block_hash.to_hex(),
            tip_height,
            tip_hash.to_hex()
        );
        let request = SyncBlocksRequest {
            start_hash: best_full_block_hash.to_vec(),
            // To the tip!
            end_hash: tip_hash.to_vec(),
        };

        let mut block_stream = client.sync_blocks(request).await?;
        let mut prev_hash = best_full_block_hash;
        let mut current_block = None;
        let mut last_sync_timer = Instant::now();
        let mut avg_latency = RollingAverageTime::new(20);
        while let Some(block_result) = block_stream.next().await {
            let latency = last_sync_timer.elapsed();
            avg_latency.add_sample(latency);
            let block_body_response = block_result?;

            let header = self
                .db
                .fetch_chain_header_by_block_hash(block_body_response.hash.clone().try_into()?)
                .await?
                .ok_or_else(|| {
                    BlockSyncError::UnknownHeaderHash(format!(
                        "Peer sent hash ({}) for block header we do not have",
                        block_body_response.hash.to_hex()
                    ))
                })?;

            let current_height = header.height();
            let header_hash = *header.hash();
            let timestamp = header.timestamp();

            if header.header().prev_hash != prev_hash {
                return Err(BlockSyncError::BlockWithoutParent {
                    expected: prev_hash.to_hex(),
                    got: header.header().prev_hash.to_hex(),
                });
            }

            prev_hash = header_hash;

            let body = block_body_response
                .body
                .map(AggregateBody::try_from)
                .ok_or_else(|| BlockSyncError::InvalidBlockBody("Peer sent empty block".to_string()))?
                .map_err(BlockSyncError::InvalidBlockBody)?;

            debug!(
                target: LOG_TARGET,
                "Validating block body #{} (PoW = {}, {}, latency: {:.2?})",
                current_height,
                header.header().pow_algo(),
                body.to_counts_string(),
                latency
            );

            let timer = Instant::now();
            let (header, header_accum_data) = header.into_parts();
            let block = Block::new(header, body);

            // Validate the block inside a tokio task
            let task_block = block.clone();
            let db = self.db.inner().clone();
            let validator = self.block_validator.clone();
            let res = {
                let txn = db.db_read_access()?;
                validator.validate_body(&*txn, &task_block)
            };

            let block = match res {
                Ok(block) => block,
                Err(err @ ValidationError::BadBlockFound { .. }) | Err(err @ ValidationError::FatalStorageError(_)) => {
                    return Err(err.into());
                },
                Err(err) => {
                    // Add to bad blocks
                    if let Err(err) = self
                        .db
                        .write_transaction()
                        .delete_orphan(header_hash)
                        .insert_bad_block(header_hash, current_height, err.to_string())
                        .commit()
                        .await
                    {
                        error!(target: LOG_TARGET, "Failed to insert bad block: {err}");
                    }
                    return Err(err.into());
                },
            };

            let block = ChainBlock::try_construct(Arc::new(block), header_accum_data)
                .map(Arc::new)
                .ok_or(BlockSyncError::FailedToConstructChainBlock)?;

            debug!(
                target: LOG_TARGET,
                "Validated in {:.0?}. Storing block body #{} (PoW = {}, {})",
                timer.elapsed(),
                block.header().height,
                block.header().pow_algo(),
                block.block().body.to_counts_string(),
            );
            trace!(
                target: LOG_TARGET,
                "{block}"
            );

            self.db
                .write_transaction()
                .delete_orphan(header_hash)
                .insert_tip_block_body(block.clone())
                .set_best_block(
                    block.height(),
                    header_hash,
                    block.accumulated_data().total_accumulated_difficulty,
                    block.header().prev_hash,
                    timestamp,
                )
                .commit()
                .await?;

            // Average time between receiving blocks from the peer - used to detect a slow sync peer
            let last_avg_latency = avg_latency.calculate_average_with_min_samples(5);
            if let Some(latency) = last_avg_latency {
                sync_peer.set_latency(latency);
            }
            // Includes time to add block to database, used to show blocks/s on status line
            sync_peer.add_sample(last_sync_timer.elapsed());
            self.hooks
                .call_on_progress_block_hooks(block.clone(), tip_height, &sync_peer);

            if let Some(avg_latency) = last_avg_latency {
                if avg_latency > max_latency {
                    return Err(BlockSyncError::MaxLatencyExceeded {
                        peer: sync_peer.node_id().clone(),
                        latency: avg_latency,
                        max_latency,
                    });
                }
            }

            current_block = Some(block);
            last_sync_timer = Instant::now();
        }
        debug!(
            "Sync peer claim at start  - height: {}, accumulated difficulty: {}",
            sync_peer.claimed_chain_metadata().best_block_height(),
            sync_peer.claimed_chain_metadata().accumulated_difficulty(),
        );
        debug!(
            "Our best header at start  - height: {}, accumulated difficulty: {}",
            best_height,
            chain_header.accumulated_data().total_accumulated_difficulty,
        );
        let metadata_after_sync = self.db.get_chain_metadata().await?;
        debug!(
            "Our best block after sync - height: {}, accumulated difficulty: {}",
            metadata_after_sync.best_block_height(),
            metadata_after_sync.accumulated_difficulty(),
        );

        if metadata_after_sync.accumulated_difficulty() < sync_peer.claimed_chain_metadata().accumulated_difficulty() {
            return Err(BlockSyncError::PeerDidNotSupplyAllClaimedBlocks(format!(
                "Their claim - height: {}, accumulated difficulty: {}. Our status after block sync - height: {}, \
                 accumulated difficulty: {}",
                sync_peer.claimed_chain_metadata().best_block_height(),
                sync_peer.claimed_chain_metadata().accumulated_difficulty(),
                metadata_after_sync.best_block_height(),
                metadata_after_sync.accumulated_difficulty(),
            )));
        }

        if let Some(block) = current_block {
            self.hooks.call_on_complete_hooks(block, best_height);
        }

        debug!(target: LOG_TARGET, "Completed block sync with peer `{sync_peer}`");

        Ok(())
    }

    // Sync peers are also removed from the list of sync peers if the ban duration is longer than the short ban period.
    fn remove_sync_peer(&mut self, node_id: &NodeId) {
        if let Some(pos) = self.sync_peers.iter().position(|p| p.node_id() == node_id) {
            self.sync_peers.remove(pos);
        }
    }

    // Helper function to get the index to the node_id inside of the vec of peers
    fn get_sync_peer_index(&mut self, node_id: &NodeId) -> Option<usize> {
        self.sync_peers.iter().position(|p| p.node_id() == node_id)
    }
}

1	// Copyright 2020, The Tari Project
2	//
3	// Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
4	// following conditions are met:
5	//
6	// 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
7	// disclaimer.
8	//
9	// 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
10	// following disclaimer in the documentation and/or other materials provided with the distribution.
11	//
12	// 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote
13	// products derived from this software without specific prior written permission.
14	//
15	// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
16	// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17	// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
18	// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
19	// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
20	// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
21	// USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
22
23	use std::{
24	convert::{TryFrom, TryInto},
25	sync::Arc,
26	time::{Duration, Instant},
27	};
28
29	use futures::StreamExt;
30	use log::*;
31	use tari_comms::{connectivity::ConnectivityRequester, peer_manager::NodeId, protocol::rpc::RpcClient, PeerConnection};
32	use tari_node_components::blocks::{Block, ChainBlock};
33	use tari_transaction_components::{aggregated_body::AggregateBody, BanPeriod};
34	use tari_utilities::hex::Hex;
35
36	use super::error::BlockSyncError;
37	use crate::{
38	base_node::{
39	sync::{ban::PeerBanManager, hooks::Hooks, rpc, SyncPeer},
40	BlockchainSyncConfig,
41	},
42	chain_storage::{async_db::AsyncBlockchainDb, BlockchainBackend},
43	common::rolling_avg::RollingAverageTime,
44	proto::base_node::SyncBlocksRequest,
45	validation::{BlockBodyValidator, ValidationError},
46	};
47	const LOG_TARGET: &str = "c::bn::block_sync";
48
49	const MAX_LATENCY_INCREASES: usize = 5;
50
51	pub struct BlockSynchronizer<'a, B> {
52	config: BlockchainSyncConfig,
53	db: AsyncBlockchainDb<B>,
54	connectivity: ConnectivityRequester,
55	sync_peers: &'a mut Vec<SyncPeer>,
56	block_validator: Arc<dyn BlockBodyValidator<B>>,
57	hooks: Hooks,
58	peer_ban_manager: PeerBanManager,
59	}
60
61	impl<'a, B: BlockchainBackend + 'static> BlockSynchronizer<'a, B> {
62	pub fn new(	×
63	config: BlockchainSyncConfig,	×
64	db: AsyncBlockchainDb<B>,	×
65	connectivity: ConnectivityRequester,	×
66	sync_peers: &'a mut Vec<SyncPeer>,	×
67	block_validator: Arc<dyn BlockBodyValidator<B>>,	×
68	) -> Self {	×
69	let peer_ban_manager = PeerBanManager::new(config.clone(), connectivity.clone());	×
70	Self {	×
71	config,	×
72	db,	×
73	connectivity,	×
74	sync_peers,	×
75	block_validator,	×
76	hooks: Default::default(),	×
77	peer_ban_manager,	×
78	}	×
79	}	×
80
81	pub fn on_starting<H>(&mut self, hook: H)	×
82	where for<'r> H: FnOnce(&SyncPeer) + Send + Sync + 'static {	×
83	self.hooks.add_on_starting_hook(hook);	×
84	}	×
85
86	pub fn on_progress<H>(&mut self, hook: H)	×
87	where H: Fn(Arc<ChainBlock>, u64, &SyncPeer) + Send + Sync + 'static {	×
88	self.hooks.add_on_progress_block_hook(hook);	×
89	}	×
90
91	pub fn on_complete<H>(&mut self, hook: H)	×
92	where H: Fn(Arc<ChainBlock>, u64) + Send + Sync + 'static {	×
93	self.hooks.add_on_complete_hook(hook);	×
94	}	×
95
96	pub async fn synchronize(&mut self) -> Result<(), BlockSyncError> {	×
97	let mut max_latency = self.config.initial_max_sync_latency;	×
98	let mut sync_round = 0;	×
99	let mut latency_increases_counter = 0;	×
100	loop {
101	match self.attempt_block_sync(max_latency).await {	×
102	Ok(_) => return Ok(()),	×
103	Err(err @ BlockSyncError::AllSyncPeersExceedLatency) => {	×
104	warn!(target: LOG_TARGET, "{err}");	×
105	max_latency += self.config.max_latency_increase;	×
106	warn!(	×
107	target: LOG_TARGET,	×
108	"Retrying block sync with increased max latency {:.2?} with {} sync peers",	×
109	max_latency,
110	self.sync_peers.len()	×
111	);
112	latency_increases_counter += 1;	×
113	if latency_increases_counter > MAX_LATENCY_INCREASES {	×
114	return Err(err);	×
115	}	×
116	// Prohibit using a few slow sync peers only, rather get new sync peers assigned
117	if self.sync_peers.len() < 2 {	×
118	return Err(err);	×
119	} else {
120	continue;	×
121	}
122	},
123	Err(err @ BlockSyncError::SyncRoundFailed) => {	×
124	sync_round += 1;	×
125	warn!(target: LOG_TARGET, "{err} ({sync_round})");	×
126	continue;	×
127	},
128	Err(err) => {	×
129	return Err(err);	×
130	},
131	}
132	}
133	}	×
134
135	async fn attempt_block_sync(&mut self, max_latency: Duration) -> Result<(), BlockSyncError> {	×
136	let sync_peer_node_ids = self.sync_peers.iter().map(\|p\| p.node_id()).cloned().collect::<Vec<_>>();	×
137	info!(	×
138	target: LOG_TARGET,	×
139	"Attempting to sync blocks({} sync peers)",	×
140	sync_peer_node_ids.len()	×
141	);
142	let mut latency_counter = 0usize;	×
143	for node_id in sync_peer_node_ids {	×
144	let peer_index = self.get_sync_peer_index(&node_id).ok_or(BlockSyncError::PeerNotFound)?;	×
145	let sync_peer = self.sync_peers.get(peer_index).expect("Already checked");	×
146	self.hooks.call_on_starting_hook(sync_peer);	×
147	let mut conn = match self.connect_to_sync_peer(node_id.clone()).await {	×
148	Ok(val) => val,	×
149	Err(e) => {	×
150	warn!(	×
151	target: LOG_TARGET,	×
152	"Failed to connect to sync peer `{node_id}`: {e}"	×
153	);
154	self.remove_sync_peer(&node_id);	×
155	continue;	×
156	},
157	};
158	let config = RpcClient::builder()	×
159	.with_deadline(self.config.rpc_deadline)	×
160	.with_deadline_grace_period(Duration::from_secs(5));	×
161	let mut client = match conn	×
162	.connect_rpc_using_builder::<rpc::BaseNodeSyncRpcClient>(config)	×
163	.await	×
164	{
165	Ok(val) => val,	×
166	Err(e) => {	×
167	warn!(	×
168	target: LOG_TARGET,	×
169	"Failed to obtain RPC connection from sync peer `{node_id}`: {e}"	×
170	);
171	self.remove_sync_peer(&node_id);	×
172	continue;	×
173	},
174	};
175	let latency = client	×
176	.get_last_request_latency()	×
177	.expect("unreachable panic: last request latency must be set after connect");	×
178	self.sync_peers	×
179	.get_mut(peer_index)	×
180	.expect("Already checked")	×
181	.set_latency(latency);	×
182	let sync_peer = self.sync_peers.get(peer_index).expect("Already checked").clone();	×
183	info!(	×
184	target: LOG_TARGET,	×
185	"Attempting to synchronize blocks with `{node_id}` latency: {latency:.2?}"	×
186	);
187	match self.synchronize_blocks(sync_peer, client, max_latency).await {	×
188	Ok(_) => return Ok(()),	×
189	Err(err) => {	×
190	warn!(target: LOG_TARGET, "{err}");	×
191	let ban_reason = BlockSyncError::get_ban_reason(&err);	×
192	if let Some(reason) = ban_reason {	×
193	let duration = match reason.ban_duration {	×
194	BanPeriod::Short => self.config.short_ban_period,	×
195	BanPeriod::Long => self.config.ban_period,	×
196	};
197	self.peer_ban_manager	×
198	.ban_peer_if_required(&node_id, reason.reason, duration)	×
199	.await;	×
200	}	×
201	if let BlockSyncError::MaxLatencyExceeded { .. } = err {	×
202	latency_counter += 1;	×
203	} else {	×
204	self.remove_sync_peer(&node_id);	×
205	}	×
206	},
207	}
208	}
209
210	if self.sync_peers.is_empty() {	×
211	Err(BlockSyncError::NoMoreSyncPeers("Block sync failed".to_string()))	×
212	} else if latency_counter >= self.sync_peers.len() {	×
213	Err(BlockSyncError::AllSyncPeersExceedLatency)	×
214	} else {
215	Err(BlockSyncError::SyncRoundFailed)	×
216	}
217	}	×
218
219	async fn connect_to_sync_peer(&self, peer: NodeId) -> Result<PeerConnection, BlockSyncError> {	×
220	let connection = self.connectivity.dial_peer(peer).await?;	×
221	Ok(connection)	×
222	}	×
223
224	#[allow(clippy::too_many_lines)]
225	async fn synchronize_blocks(	×
226	&mut self,	×
227	mut sync_peer: SyncPeer,	×
228	mut client: rpc::BaseNodeSyncRpcClient,	×
229	max_latency: Duration,	×
230	) -> Result<(), BlockSyncError> {	×
231	info!(target: LOG_TARGET, "Starting block sync from peer {}", sync_peer.node_id());	×
232
233	let tip_header = self.db.fetch_last_header().await?;	×
234	let local_metadata = self.db.get_chain_metadata().await?;	×
235
236	if tip_header.height <= local_metadata.best_block_height() {	×
237	debug!(	×
238	target: LOG_TARGET,	×
239	"Blocks already synchronized to height {}.", tip_header.height	×
240	);
241	return Ok(());	×
242	}	×
243
244	let tip_hash = tip_header.hash();	×
245	let tip_height = tip_header.height;	×
246	let best_height = local_metadata.best_block_height();	×
247	let chain_header = self.db.fetch_chain_header(best_height).await?;	×
248
249	let best_full_block_hash = chain_header.accumulated_data().hash;	×
250	debug!(	×
251	target: LOG_TARGET,	×
252	"Starting block sync from peer `{}`. Current best block is #{} `{}`. Syncing to #{} ({}).",	×
253	sync_peer,
254	best_height,
255	best_full_block_hash.to_hex(),	×
256	tip_height,
257	tip_hash.to_hex()	×
258	);
259	let request = SyncBlocksRequest {	×
260	start_hash: best_full_block_hash.to_vec(),	×
261	// To the tip!	×
262	end_hash: tip_hash.to_vec(),	×
263	};	×
264
265	let mut block_stream = client.sync_blocks(request).await?;	×
266	let mut prev_hash = best_full_block_hash;	×
267	let mut current_block = None;	×
268	let mut last_sync_timer = Instant::now();	×
269	let mut avg_latency = RollingAverageTime::new(20);	×
270	while let Some(block_result) = block_stream.next().await {	×
271	let latency = last_sync_timer.elapsed();	×
272	avg_latency.add_sample(latency);	×
273	let block_body_response = block_result?;	×
274
275	let header = self	×
276	.db	×
277	.fetch_chain_header_by_block_hash(block_body_response.hash.clone().try_into()?)	×
278	.await?	×
279	.ok_or_else(\|\| {	×
280	BlockSyncError::UnknownHeaderHash(format!(	×
281	"Peer sent hash ({}) for block header we do not have",	×
282	block_body_response.hash.to_hex()	×
283	))	×
284	})?;	×
285
286	let current_height = header.height();	×
287	let header_hash = *header.hash();	×
288	let timestamp = header.timestamp();	×
289
290	if header.header().prev_hash != prev_hash {	×
291	return Err(BlockSyncError::BlockWithoutParent {	×
292	expected: prev_hash.to_hex(),	×
293	got: header.header().prev_hash.to_hex(),	×
294	});	×
295	}	×
296
297	prev_hash = header_hash;	×
298
299	let body = block_body_response	×
300	.body	×
301	.map(AggregateBody::try_from)	×
302	.ok_or_else(\|\| BlockSyncError::InvalidBlockBody("Peer sent empty block".to_string()))?	×
303	.map_err(BlockSyncError::InvalidBlockBody)?;	×
304
305	debug!(	×
306	target: LOG_TARGET,	×
307	"Validating block body #{} (PoW = {}, {}, latency: {:.2?})",	×
308	current_height,
309	header.header().pow_algo(),	×
310	body.to_counts_string(),	×
311	latency
312	);
313
314	let timer = Instant::now();	×
315	let (header, header_accum_data) = header.into_parts();	×
316	let block = Block::new(header, body);	×
317
318	// Validate the block inside a tokio task
319	let task_block = block.clone();	×
320	let db = self.db.inner().clone();	×
321	let validator = self.block_validator.clone();	×
322	let res = {	×
323	let txn = db.db_read_access()?;	×
324	validator.validate_body(&*txn, &task_block)	×
325	};
326
327	let block = match res {	×
328	Ok(block) => block,	×
329	Err(err @ ValidationError::BadBlockFound { .. }) \| Err(err @ ValidationError::FatalStorageError(_)) => {	×
330	return Err(err.into());	×
331	},
332	Err(err) => {	×
333	// Add to bad blocks
334	if let Err(err) = self	×
335	.db	×
336	.write_transaction()	×
337	.delete_orphan(header_hash)	×
338	.insert_bad_block(header_hash, current_height, err.to_string())	×
339	.commit()	×
340	.await	×
341	{
342	error!(target: LOG_TARGET, "Failed to insert bad block: {err}");	×
343	}	×
344	return Err(err.into());	×
345	},
346	};
347
348	let block = ChainBlock::try_construct(Arc::new(block), header_accum_data)	×
349	.map(Arc::new)	×
350	.ok_or(BlockSyncError::FailedToConstructChainBlock)?;	×
351
352	debug!(	×
353	target: LOG_TARGET,	×
354	"Validated in {:.0?}. Storing block body #{} (PoW = {}, {})",	×
355	timer.elapsed(),	×
356	block.header().height,	×
357	block.header().pow_algo(),	×
358	block.block().body.to_counts_string(),	×
359	);
360	trace!(	×
361	target: LOG_TARGET,	×
362	"{block}"	×
363	);
364
365	self.db	×
366	.write_transaction()	×
367	.delete_orphan(header_hash)	×
368	.insert_tip_block_body(block.clone())	×
369	.set_best_block(	×
370	block.height(),	×
371	header_hash,	×
372	block.accumulated_data().total_accumulated_difficulty,	×
373	block.header().prev_hash,	×
374	timestamp,	×
375	)	×
376	.commit()	×
377	.await?;	×
378
379	// Average time between receiving blocks from the peer - used to detect a slow sync peer
380	let last_avg_latency = avg_latency.calculate_average_with_min_samples(5);	×
381	if let Some(latency) = last_avg_latency {	×
382	sync_peer.set_latency(latency);	×
383	}	×
384	// Includes time to add block to database, used to show blocks/s on status line
385	sync_peer.add_sample(last_sync_timer.elapsed());	×
386	self.hooks	×
387	.call_on_progress_block_hooks(block.clone(), tip_height, &sync_peer);	×
388
389	if let Some(avg_latency) = last_avg_latency {	×
390	if avg_latency > max_latency {	×
391	return Err(BlockSyncError::MaxLatencyExceeded {	×
392	peer: sync_peer.node_id().clone(),	×
393	latency: avg_latency,	×
394	max_latency,	×
395	});	×
396	}	×
397	}	×
398
399	current_block = Some(block);	×
400	last_sync_timer = Instant::now();	×
401	}
402	debug!(	×
403	"Sync peer claim at start - height: {}, accumulated difficulty: {}",	×
404	sync_peer.claimed_chain_metadata().best_block_height(),	×
405	sync_peer.claimed_chain_metadata().accumulated_difficulty(),	×
406	);
407	debug!(	×
408	"Our best header at start - height: {}, accumulated difficulty: {}",	×
409	best_height,
410	chain_header.accumulated_data().total_accumulated_difficulty,	×
411	);
412	let metadata_after_sync = self.db.get_chain_metadata().await?;	×
413	debug!(	×
414	"Our best block after sync - height: {}, accumulated difficulty: {}",	×
415	metadata_after_sync.best_block_height(),	×
416	metadata_after_sync.accumulated_difficulty(),	×
417	);
418
419	if metadata_after_sync.accumulated_difficulty() < sync_peer.claimed_chain_metadata().accumulated_difficulty() {	×
420	return Err(BlockSyncError::PeerDidNotSupplyAllClaimedBlocks(format!(	×
421	"Their claim - height: {}, accumulated difficulty: {}. Our status after block sync - height: {}, \	×
422	accumulated difficulty: {}",	×
423	sync_peer.claimed_chain_metadata().best_block_height(),	×
424	sync_peer.claimed_chain_metadata().accumulated_difficulty(),	×
425	metadata_after_sync.best_block_height(),	×
426	metadata_after_sync.accumulated_difficulty(),	×
427	)));	×
428	}	×
429
430	if let Some(block) = current_block {	×
431	self.hooks.call_on_complete_hooks(block, best_height);	×
432	}	×
433
434	debug!(target: LOG_TARGET, "Completed block sync with peer `{sync_peer}`");	×
435
436	Ok(())	×
437	}	×
438
439	// Sync peers are also removed from the list of sync peers if the ban duration is longer than the short ban period.
440	fn remove_sync_peer(&mut self, node_id: &NodeId) {	×
441	if let Some(pos) = self.sync_peers.iter().position(\|p\| p.node_id() == node_id) {	×
442	self.sync_peers.remove(pos);	×
443	}	×
444	}	×
445
446	// Helper function to get the index to the node_id inside of the vec of peers
447	fn get_sync_peer_index(&mut self, node_id: &NodeId) -> Option<usize> {	×
448	self.sync_peers.iter().position(\|p\| p.node_id() == node_id)	×
449	}	×
450	}

tari-project / tari / 20166106361

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