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State sync (#1007)
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* Starting to implement fast sync

* Adding block fetch horizon, after which to sync state instead of downloading blocks

* Add genesis to handshake to prevent nodes from wrong network connecting

* Progress on state syncing: requests and responds with state at given block hash / merkle root. Applies it and progresses sync state

* Added Grin to attributions

* Continue state sync: sync into block t-5 to have few recent blocks as well, updating tip of block head and unlock orphans

* Sync state for one shard works without receipts

* Add receipts to state syncing

* Remove extra print

* Add error propagation and retry for state sync

* Clean up validator rotation: remove requirement to rewrite genesis hash into CryptoHash::default()

* Fixing nits
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@ilblackdragon
ilblackdragon authored Jul 2, 2019
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180 changes: 180 additions & 0 deletions ATTRIBUTIONS.md
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ We have taken inspiration and few pieces of code from:
* [Parity Ethereum](https://github.com/paritytech/parity-ethereum)
* [Parity Substrate](https://github.com/paritytech/substrate)
* [Parity Trie](https://github.com/paritytech/trie)
* [Grin](https://github.com/mimblewimble/grin/)

## Licenses

Expand Down Expand Up @@ -888,3 +889,182 @@ Public License instead of this License. But first, please read
See the License for the specific language governing permissions and
limitations under the License.

### Grin


Apache License
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81 changes: 59 additions & 22 deletions chain/chain/src/chain.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ use log::{debug, info};

use near_primitives::hash::CryptoHash;
use near_primitives::transaction::{ReceiptTransaction, TransactionResult};
use near_primitives::types::{BlockIndex, MerkleHash};
use near_primitives::types::{BlockIndex, MerkleHash, ShardId};
use near_store::Store;

use crate::error::{Error, ErrorKind};
Expand Down Expand Up @@ -145,6 +145,9 @@ impl Chain {
}
Err(err) => match err.kind() {
ErrorKind::DBNotFoundErr(_) => {
runtime_adapter
.add_validator_proposals(CryptoHash::default(), genesis.hash(), 0, vec![])
.map_err(|err| ErrorKind::Other(err.to_string()))?;
store_update
.save_post_state_root(&genesis.hash(), &genesis.header.prev_state_root);
store_update.save_block_header(genesis.header.clone());
Expand Down Expand Up @@ -188,7 +191,7 @@ impl Chain {
pub fn process_block_header(&mut self, header: &BlockHeader) -> Result<(), Error> {
// We create new chain update, but it's not going to be committed so it's read only.
let mut chain_update =
ChainUpdate::new(self.genesis.hash(), &mut self.store, self.runtime_adapter.clone(), &self.orphans);
ChainUpdate::new(&mut self.store, self.runtime_adapter.clone(), &self.orphans);
chain_update.process_block_header(header)?;
Ok(())
}
Expand Down Expand Up @@ -217,13 +220,16 @@ impl Chain {
/// Processes headers and adds them to store for syncing.
pub fn sync_block_headers(&mut self, headers: Vec<BlockHeader>) -> Result<(), Error> {
let mut chain_update =
ChainUpdate::new(self.genesis.hash(), &mut self.store, self.runtime_adapter.clone(), &self.orphans);
ChainUpdate::new(&mut self.store, self.runtime_adapter.clone(), &self.orphans);
chain_update.sync_block_headers(headers)?;
chain_update.commit()
}

/// Check if state download is required, otherwise return hashes of blocks to fetch.
pub fn check_state_needed(&mut self) -> Result<(bool, Vec<CryptoHash>), Error> {
pub fn check_state_needed(
&mut self,
block_fetch_horizon: BlockIndex,
) -> Result<(bool, Vec<CryptoHash>), Error> {
let block_head = self.head()?;
let header_head = self.header_head()?;
let mut hashes = vec![];
Expand All @@ -233,7 +239,7 @@ impl Chain {
}

// Find common block between header chain and block chain.
let mut _oldest_height = 0;
let mut oldest_height = 0;
let mut current = self.get_block_header(&header_head.last_block_hash).map(|h| h.clone());
while let Ok(header) = current {
if header.height <= block_head.height {
Expand All @@ -242,14 +248,15 @@ impl Chain {
}
}

_oldest_height = header.height;
oldest_height = header.height;
hashes.push(header.hash());
current = self.get_previous_header(&header).map(|h| h.clone());
}

// TODO: calcaulate if the oldest height is too far from header_head.height
// let sync_head = self.sync_head()?;
// and return Ok(true) to download state instead.
let sync_head = self.sync_head()?;
if oldest_height < sync_head.height.saturating_sub(block_fetch_horizon) {
return Ok((true, vec![]));
}
Ok((false, hashes))
}

Expand Down Expand Up @@ -305,7 +312,7 @@ impl Chain {
{
let prev_head = self.store.head()?;
let mut chain_update =
ChainUpdate::new(self.genesis.hash(), &mut self.store, self.runtime_adapter.clone(), &self.orphans);
ChainUpdate::new(&mut self.store, self.runtime_adapter.clone(), &self.orphans);
let maybe_new_head = chain_update.process_block(&block, &provenance);

if let Ok(_) = maybe_new_head {
Expand Down Expand Up @@ -357,7 +364,7 @@ impl Chain {
}

/// Check for orphans, once a block is successfully added.
fn check_orphans<F>(&mut self, mut height: BlockIndex, block_accepted: F) -> Option<Tip>
pub fn check_orphans<F>(&mut self, mut height: BlockIndex, block_accepted: F) -> Option<Tip>
where
F: Copy + FnMut(&Block, BlockStatus, Provenance) -> (),
{
Expand Down Expand Up @@ -406,6 +413,31 @@ impl Chain {

maybe_new_head
}

pub fn set_shard_state(
&mut self,
shard_id: ShardId,
hash: CryptoHash,
payload: Vec<u8>,
receipts: Vec<ReceiptTransaction>,
) -> Result<(), Error> {
// TODO(1046): update this with any required changes for chunks support.
let header = self.get_block_header(&hash)?;
let (prev_hash, state_root) = (header.prev_hash, header.prev_state_root);

// Save state in the runtime, will also check it's validity.
self.runtime_adapter
.set_state(shard_id, state_root, payload)
.map_err(|err| ErrorKind::InvalidStatePayload(err.to_string()))?;

// Update pointers to state root and receipts.
let mut chain_store_update = self.store.store_update();
chain_store_update.save_post_state_root(&prev_hash, &state_root);
chain_store_update.save_receipt(&prev_hash, receipts);
chain_store_update.commit()?;

Ok(())
}
}

/// Various chain getters.
Expand Down Expand Up @@ -499,6 +531,12 @@ impl Chain {
&self.store
}

/// Returns mutable ChainStore.
#[inline]
pub fn mut_store(&mut self) -> &mut ChainStore {
&mut self.store
}

/// Returns genesis block header.
#[inline]
pub fn genesis(&self) -> &BlockHeader {
Expand Down Expand Up @@ -529,21 +567,19 @@ impl Chain {
/// If rejected nothing will be updated in underlying storage.
/// Safe to stop process mid way (Ctrl+C or crash).
struct ChainUpdate<'a> {
genesis_hash: CryptoHash,
runtime_adapter: Arc<dyn RuntimeAdapter>,
chain_store_update: ChainStoreUpdate<'a, ChainStore>,
orphans: &'a OrphanBlockPool,
}

impl<'a> ChainUpdate<'a> {
pub fn new(
genesis_hash: CryptoHash,
store: &'a mut ChainStore,
runtime_adapter: Arc<dyn RuntimeAdapter>,
orphans: &'a OrphanBlockPool,
) -> Self {
let chain_store_update = store.store_update();
ChainUpdate { genesis_hash, runtime_adapter, chain_store_update, orphans }
ChainUpdate { runtime_adapter, chain_store_update, orphans }
}

/// Commit changes to the chain into the database.
Expand Down Expand Up @@ -627,13 +663,14 @@ impl<'a> ChainUpdate<'a> {
.map_err(|e| ErrorKind::Other(e.to_string()))?;

// If block checks out, record validator proposals for given block.
self.runtime_adapter.add_validator_proposals(
// Because runtime doesn't know about genesis hash, we use CryptoHash::default instead.
if block.header.prev_hash != self.genesis_hash { block.header.prev_hash } else { CryptoHash::default() },
block.hash(),
block.header.height,
validator_proposals,
).map_err(|err| ErrorKind::Other(err.to_string()))?;
self.runtime_adapter
.add_validator_proposals(
block.header.prev_hash,
block.hash(),
block.header.height,
validator_proposals,
)
.map_err(|err| ErrorKind::Other(err.to_string()))?;

self.chain_store_update.save_trie_changes(trie_changes);
// Save state root after applying transactions.
Expand Down Expand Up @@ -702,7 +739,7 @@ impl<'a> ChainUpdate<'a> {
// Add validator proposals for given header.
self.runtime_adapter
.add_validator_proposals(
if header.prev_hash != self.genesis_hash { header.prev_hash } else { CryptoHash::default() },
header.prev_hash,
header.hash(),
header.height,
header.validator_proposal.clone(),
Expand Down
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