Merge pull request #56 from tamasblummer/memblocks
Moved blockchain and patricia_tree to rust-memblocks
This commit is contained in:
Andrew Poelstra
GitHub
commit
0ef9dc3365
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@ -1,621 +0,0 @@
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// Rust Bitcoin Library
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// Written in 2014 by
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// Andrew Poelstra <apoelstra@wpsoftware.net>
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//
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// To the extent possible under law, the author(s) have dedicated all
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// copyright and related and neighboring rights to this software to
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// the public domain worldwide. This software is distributed without
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// any warranty.
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//
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// You should have received a copy of the CC0 Public Domain Dedication
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// along with this software.
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// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
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//
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//! # Bitcoin Blockchain
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//!
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//! This module provides the structures and functions to maintain the
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//! blockchain.
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//!
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use std::{marker, ptr};
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use blockdata::block::{Block, BlockHeader};
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use blockdata::transaction::Transaction;
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use blockdata::constants::{DIFFCHANGE_INTERVAL, DIFFCHANGE_TIMESPAN,
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TARGET_BLOCK_SPACING, max_target, genesis_block};
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use network::constants::Network;
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use network::encodable::{ConsensusDecodable, ConsensusEncodable};
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use network::serialize::{BitcoinHash, SimpleDecoder, SimpleEncoder};
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use util::BitArray;
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use util;
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use util::Error::{BlockNotFound, DuplicateHash, PrevHashNotFound};
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use util::uint::Uint256;
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use util::hash::Sha256dHash;
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use util::patricia_tree::PatriciaTree;
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type BlockTree = PatriciaTree<Uint256, Box<BlockchainNode>>;
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type NodePtr = *const BlockchainNode;
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/// A link in the blockchain
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pub struct BlockchainNode {
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/// The actual block
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pub block: Block,
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/// Total work from genesis to this point
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pub total_work: Uint256,
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/// Expected value of `block.header.bits` for this block; only changes every
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/// `blockdata::constants::DIFFCHANGE_INTERVAL;` blocks
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pub required_difficulty: Uint256,
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/// Height above genesis
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pub height: u32,
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/// Whether the transaction data is stored
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pub has_txdata: bool,
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/// Pointer to block's parent
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prev: NodePtr,
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/// Pointer to block's child
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next: NodePtr
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}
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impl BlockchainNode {
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/// Is the node on the main chain?
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pub fn is_on_main_chain(&self, chain: &Blockchain) -> bool {
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if self.block.header == unsafe { (*chain.best_tip).block.header } {
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true
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} else {
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unsafe {
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let mut scan = self.next;
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while !scan.is_null() {
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if (*scan).block.header == (*chain.best_tip).block.header {
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return true;
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}
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scan = (*scan).next;
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}
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}
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false
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}
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}
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}
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impl<S: SimpleEncoder> ConsensusEncodable<S> for BlockchainNode {
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#[inline]
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fn consensus_encode(&self, s: &mut S) -> Result<(), S::Error> {
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try!(self.block.consensus_encode(s));
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try!(self.total_work.consensus_encode(s));
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try!(self.required_difficulty.consensus_encode(s));
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try!(self.height.consensus_encode(s));
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try!(self.has_txdata.consensus_encode(s));
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// Don't serialize the prev or next pointers
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Ok(())
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}
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}
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impl<D: SimpleDecoder> ConsensusDecodable<D> for BlockchainNode {
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#[inline]
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fn consensus_decode(d: &mut D) -> Result<BlockchainNode, D::Error> {
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Ok(BlockchainNode {
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block: try!(ConsensusDecodable::consensus_decode(d)),
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total_work: try!(ConsensusDecodable::consensus_decode(d)),
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required_difficulty: try!(ConsensusDecodable::consensus_decode(d)),
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height: try!(ConsensusDecodable::consensus_decode(d)),
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has_txdata: try!(ConsensusDecodable::consensus_decode(d)),
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prev: ptr::null(),
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next: ptr::null()
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})
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}
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}
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impl BitcoinHash for BlockchainNode {
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fn bitcoin_hash(&self) -> Sha256dHash {
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self.block.header.bitcoin_hash()
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}
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}
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/// The blockchain
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pub struct Blockchain {
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network: Network,
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tree: BlockTree,
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best_tip: NodePtr,
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best_hash: Sha256dHash,
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genesis_hash: Sha256dHash
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}
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impl<S: SimpleEncoder> ConsensusEncodable<S> for Blockchain {
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#[inline]
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fn consensus_encode(&self, s: &mut S) -> Result<(), S::Error> {
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try!(self.network.consensus_encode(s));
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try!(self.tree.consensus_encode(s));
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try!(self.best_hash.consensus_encode(s));
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try!(self.genesis_hash.consensus_encode(s));
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Ok(())
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}
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}
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impl<D: SimpleDecoder> ConsensusDecodable<D> for Blockchain {
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fn consensus_decode(d: &mut D) -> Result<Blockchain, D::Error> {
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let network: Network = try!(ConsensusDecodable::consensus_decode(d));
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let mut tree: BlockTree = try!(ConsensusDecodable::consensus_decode(d));
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let best_hash: Sha256dHash = try!(ConsensusDecodable::consensus_decode(d));
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let genesis_hash: Sha256dHash = try!(ConsensusDecodable::consensus_decode(d));
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// Lookup best tip
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let best = match tree.lookup(&best_hash.into_le(), 256) {
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Some(node) => &**node as NodePtr,
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None => {
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return Err(d.error(format!("best tip {:x} not in tree", best_hash)));
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}
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};
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// Lookup genesis
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if tree.lookup(&genesis_hash.into_le(), 256).is_none() {
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return Err(d.error(format!("genesis {:x} not in tree", genesis_hash)));
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}
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// Reconnect all prev pointers
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let raw_tree = &tree as *const BlockTree;
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for node in tree.mut_iter() {
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let hash = node.block.header.prev_blockhash.into_le();
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let prevptr =
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match unsafe { (*raw_tree).lookup(&hash, 256) } {
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Some(node) => &**node as NodePtr,
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None => ptr::null()
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};
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node.prev = prevptr;
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}
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// Reconnect next pointers on the main chain
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unsafe {
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let mut scan = best;
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while !(*scan).prev.is_null() {
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let prev = (*scan).prev as *mut BlockchainNode;
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(*prev).next = scan;
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scan = prev as NodePtr;
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}
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// Check that "genesis" is the genesis
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if (*scan).bitcoin_hash() != genesis_hash {
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return Err(d.error(format!("no path from tip {:x} to genesis {:x}",
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best_hash, genesis_hash)));
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}
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}
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// Return the chain
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Ok(Blockchain {
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network: network,
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tree: tree,
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best_tip: best,
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best_hash: best_hash,
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genesis_hash: genesis_hash
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})
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}
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}
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// TODO: this should maybe be public, in which case it needs to be tagged
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// with a PhantomData marker tying it to the tree's lifetime.
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struct LocatorHashIter {
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index: NodePtr,
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count: usize,
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skip: usize
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}
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impl LocatorHashIter {
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fn new(init: NodePtr) -> LocatorHashIter {
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LocatorHashIter { index: init, count: 0, skip: 1 }
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}
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}
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impl Iterator for LocatorHashIter {
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type Item = Sha256dHash;
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fn next(&mut self) -> Option<Sha256dHash> {
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if self.index.is_null() {
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return None;
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}
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let ret = Some(unsafe { (*self.index).bitcoin_hash() });
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// Rewind once (if we are at the genesis, this will set self.index to None)
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self.index = unsafe { (*self.index).prev };
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// If we are not at the genesis, rewind `self.skip` times, or until we are.
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if !self.index.is_null() {
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for _ in 1..self.skip {
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unsafe {
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if (*self.index).prev.is_null() {
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break;
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}
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self.index = (*self.index).prev;
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}
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}
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}
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self.count += 1;
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if self.count > 10 {
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self.skip *= 2;
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}
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ret
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}
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}
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/// An iterator over blocks in blockheight order
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pub struct BlockIter<'tree> {
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index: NodePtr,
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// Note: we don't actually touch the blockchain. But we need
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// to keep it borrowed to prevent it being mutated, since some
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// mutable blockchain methods call .mut_borrow() on the block
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// links, which would blow up if the iterator did a regular
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// borrow at the same time.
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marker: marker::PhantomData<&'tree Blockchain>
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}
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/// An iterator over blocks in reverse blockheight order. Note that this
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/// is essentially the same as if we'd implemented `DoubleEndedIterator`
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/// on `BlockIter` --- but we can't do that since if `BlockIter` is started
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/// off the main chain, it will not reach the best tip, so the iterator
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/// and its `.rev()` would be iterators over different chains! To avoid
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/// this suprising behaviour we simply use separate iterators.
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pub struct RevBlockIter<'tree> {
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index: NodePtr,
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// See comment in BlockIter for why we need this
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marker: marker::PhantomData<&'tree Blockchain>
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}
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/// An iterator over blocks in reverse blockheight order, which yielding only
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/// stale blocks (ending at the point where it would've returned a block on
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/// the main chain). It does this by checking if the `next` pointer of the
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/// next-to-by-yielded block matches the currently-yielded block. If not, scan
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/// forward from next-to-be-yielded block. If we hit the best tip, set the
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/// next-to-by-yielded block to None instead.
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///
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/// So to handle reorgs, you create a `RevStaleBlockIter` starting from the last
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/// known block, and play it until it runs out, rewinding every block except for
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/// the last one. Since the `UtxoSet` `rewind` function sets its `last_hash()` to
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/// the prevblockhash of the rewinded block (which will be on the main chain at
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/// the end of the iteration), you can then sync it up same as if you were doing
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/// a plain old fast-forward.
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pub struct RevStaleBlockIter<'tree> {
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index: NodePtr,
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chain: &'tree Blockchain
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}
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impl<'tree> Iterator for BlockIter<'tree> {
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type Item = &'tree BlockchainNode;
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fn next(&mut self) -> Option<&'tree BlockchainNode> {
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if self.index.is_null() {
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return None;
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}
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unsafe {
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let ret = Some(&*self.index);
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self.index = (*self.index).next;
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ret
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}
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}
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}
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impl<'tree> Iterator for RevBlockIter<'tree> {
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type Item = &'tree BlockchainNode;
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fn next(&mut self) -> Option<&'tree BlockchainNode> {
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if self.index.is_null() {
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return None;
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}
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unsafe {
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let ret = Some(&*self.index);
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self.index = (*self.index).prev;
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ret
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}
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}
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}
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impl<'tree> Iterator for RevStaleBlockIter<'tree> {
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type Item = &'tree Block;
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fn next(&mut self) -> Option<&'tree Block> {
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if self.index.is_null() {
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return None;
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}
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unsafe {
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let ret = Some(&(*self.index).block);
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let next_index = (*self.index).prev;
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// Check if the next block is going to be on the main chain
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if !next_index.is_null() &&
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(*next_index).next != self.index &&
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(&*next_index).is_on_main_chain(self.chain) {
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self.index = ptr::null();
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} else {
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self.index = next_index;
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}
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ret
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}
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}
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}
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/// This function emulates the `GetCompact(SetCompact(n))` in the satoshi code,
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/// which drops the precision to something that can be encoded precisely in
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/// the nBits block header field. Savour the perversity. This is in Bitcoin
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/// consensus code. What. Gaah!
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fn satoshi_the_precision(n: Uint256) -> Uint256 {
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// Shift by B bits right then left to turn the low bits to zero
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let bits = 8 * ((n.bits() + 7) / 8 - 3);
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let mut ret = n >> bits;
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// Oh, did I say B was that fucked up formula? I meant sometimes also + 8.
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if ret.bit(23) {
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ret = (ret >> 8) << 8;
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}
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ret << bits
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}
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impl Blockchain {
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/// Constructs a new blockchain
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pub fn new(network: Network) -> Blockchain {
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let genesis = genesis_block(network);
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let genhash = genesis.header.bitcoin_hash();
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let new_node = Box::new(BlockchainNode {
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total_work: Default::default(),
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required_difficulty: genesis.header.target(),
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block: genesis,
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height: 0,
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has_txdata: true,
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prev: ptr::null(),
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next: ptr::null()
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});
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let raw_ptr = &*new_node as NodePtr;
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Blockchain {
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network: network,
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tree: {
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let mut pat = PatriciaTree::new();
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pat.insert(&genhash.into_le(), 256, new_node);
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pat
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},
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best_hash: genhash,
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genesis_hash: genhash,
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best_tip: raw_ptr
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}
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}
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fn replace_txdata(&mut self, hash: &Uint256, txdata: Vec<Transaction>, has_txdata: bool) -> Result<(), util::Error> {
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match self.tree.lookup_mut(hash, 256) {
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Some(existing_block) => {
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existing_block.block.txdata.clone_from(&txdata);
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existing_block.has_txdata = has_txdata;
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Ok(())
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},
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None => Err(BlockNotFound)
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}
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}
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/// Looks up a block in the chain and returns the BlockchainNode containing it
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pub fn get_block(&self, hash: Sha256dHash) -> Option<&BlockchainNode> {
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self.tree.lookup(&hash.into_le(), 256).map(|node| &**node)
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}
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/// Locates a block in the chain and overwrites its txdata
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pub fn add_txdata(&mut self, block: Block) -> Result<(), util::Error> {
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self.replace_txdata(&block.header.bitcoin_hash().into_le(), block.txdata, true)
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}
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/// Locates a block in the chain and removes its txdata
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pub fn remove_txdata(&mut self, hash: Sha256dHash) -> Result<(), util::Error> {
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self.replace_txdata(&hash.into_le(), vec![], false)
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}
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/// Adds a block header to the chain
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pub fn add_header(&mut self, header: BlockHeader) -> Result<(), util::Error> {
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self.real_add_block(Block { header: header, txdata: vec![] }, false)
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}
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/// Adds a block to the chain
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pub fn add_block(&mut self, block: Block) -> Result<(), util::Error> {
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self.real_add_block(block, true)
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}
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fn real_add_block(&mut self, block: Block, has_txdata: bool) -> Result<(), util::Error> {
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// get_prev optimizes the common case where we are extending the best tip
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#[inline]
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fn get_prev(chain: &Blockchain, hash: Sha256dHash) -> Option<NodePtr> {
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if hash == chain.best_hash {
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Some(chain.best_tip)
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} else {
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chain.tree.lookup(&hash.into_le(), 256).map(|boxptr| &**boxptr as NodePtr)
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}
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}
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// Check for multiple inserts (bitcoind from c9a09183 to 3c85d2ec doesn't
|
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// handle locator hashes properly and may return blocks multiple times,
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// and this may also happen in case of a reorg.
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if self.tree.lookup(&block.header.bitcoin_hash().into_le(), 256).is_some() {
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return Err(DuplicateHash);
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}
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// Construct node, if possible
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let new_block = match get_prev(self, block.header.prev_blockhash) {
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Some(prev) => {
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let difficulty =
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// Compute required difficulty if this is a diffchange block
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if (unsafe { (*prev).height } + 1) % DIFFCHANGE_INTERVAL == 0 {
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let timespan = unsafe {
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// Scan back DIFFCHANGE_INTERVAL blocks
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let mut scan = prev;
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for _ in 0..(DIFFCHANGE_INTERVAL - 1) {
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scan = (*scan).prev;
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}
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// Get clamped timespan between first and last blocks
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match (*prev).block.header.time - (*scan).block.header.time {
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n if n < DIFFCHANGE_TIMESPAN / 4 => DIFFCHANGE_TIMESPAN / 4,
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n if n > DIFFCHANGE_TIMESPAN * 4 => DIFFCHANGE_TIMESPAN * 4,
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n => n
|
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}
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};
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// Compute new target
|
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let mut target = unsafe { (*prev).block.header.target() };
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target = target.mul_u32(timespan);
|
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target = target / Uint256::from_u64(DIFFCHANGE_TIMESPAN as u64).unwrap();
|
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// Clamp below MAX_TARGET (difficulty 1)
|
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let max = max_target(self.network);
|
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if target > max { target = max };
|
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// Compactify (make expressible in the 8+24 nBits float format
|
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satoshi_the_precision(target)
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// On non-diffchange blocks, Testnet has a rule that any 20-minute-long
|
||||
// block intervals result the difficulty
|
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} else if self.network == Network::Testnet &&
|
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block.header.time > unsafe { (*prev).block.header.time } + 2*TARGET_BLOCK_SPACING {
|
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max_target(self.network)
|
||||
// On the other hand, if we are in Testnet and the block interval is less
|
||||
// than 20 minutes, we need to scan backward to find a block for which the
|
||||
// previous rule did not apply, to find the "real" difficulty.
|
||||
} else if self.network == Network::Testnet {
|
||||
// Scan back DIFFCHANGE_INTERVAL blocks
|
||||
unsafe {
|
||||
let mut scan = prev;
|
||||
while (*scan).height % DIFFCHANGE_INTERVAL != 0 &&
|
||||
(*scan).required_difficulty == max_target(self.network) {
|
||||
scan = (*scan).prev;
|
||||
}
|
||||
(*scan).required_difficulty
|
||||
}
|
||||
// Otherwise just use the last block's difficulty
|
||||
} else {
|
||||
unsafe { (*prev).required_difficulty }
|
||||
};
|
||||
// Create node
|
||||
let ret = Box::new(BlockchainNode {
|
||||
total_work: block.header.work() + unsafe { (*prev).total_work },
|
||||
block: block,
|
||||
required_difficulty: difficulty,
|
||||
height: unsafe { (*prev).height + 1 },
|
||||
has_txdata: has_txdata,
|
||||
prev: prev,
|
||||
next: ptr::null()
|
||||
});
|
||||
unsafe {
|
||||
let prev = prev as *mut BlockchainNode;
|
||||
(*prev).next = &*ret as NodePtr;
|
||||
}
|
||||
ret
|
||||
},
|
||||
None => {
|
||||
return Err(PrevHashNotFound);
|
||||
}
|
||||
};
|
||||
|
||||
// spv validate the block
|
||||
try!(new_block.block.header.spv_validate(&new_block.required_difficulty));
|
||||
|
||||
// Insert the new block
|
||||
let raw_ptr = &*new_block as NodePtr;
|
||||
self.tree.insert(&new_block.block.header.bitcoin_hash().into_le(), 256, new_block);
|
||||
// Replace the best tip if necessary
|
||||
if unsafe { (*raw_ptr).total_work > (*self.best_tip).total_work } {
|
||||
self.set_best_tip(raw_ptr);
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Sets the best tip (not public)
|
||||
fn set_best_tip(&mut self, tip: NodePtr) {
|
||||
// Fix next links
|
||||
unsafe {
|
||||
let mut scan = self.best_tip;
|
||||
// Scan backward
|
||||
while !(*scan).prev.is_null() {
|
||||
// If we hit the old best, there is no need to reorg.
|
||||
if scan == self.best_tip { break; }
|
||||
// Otherwise set the next-ptr and carry on
|
||||
let prev = (*scan).prev as *mut BlockchainNode;
|
||||
(*prev).next = scan;
|
||||
scan = (*scan).prev;
|
||||
}
|
||||
}
|
||||
// Set best
|
||||
self.best_hash = unsafe { (*tip).bitcoin_hash() };
|
||||
self.best_tip = tip;
|
||||
}
|
||||
|
||||
/// Returns the genesis block's blockhash
|
||||
pub fn genesis_hash(&self) -> Sha256dHash {
|
||||
self.genesis_hash
|
||||
}
|
||||
|
||||
/// Returns the best tip
|
||||
pub fn best_tip(&self) -> &Block {
|
||||
unsafe { &(*self.best_tip).block }
|
||||
}
|
||||
|
||||
/// Returns the best tip height
|
||||
pub fn best_tip_height(&self) -> u32 {
|
||||
unsafe { (*self.best_tip).height }
|
||||
}
|
||||
|
||||
/// Returns the best tip's blockhash
|
||||
pub fn best_tip_hash(&self) -> Sha256dHash {
|
||||
self.best_hash
|
||||
}
|
||||
|
||||
/// Returns an array of locator hashes used in `getheaders` messages
|
||||
pub fn locator_hashes(&self) -> Vec<Sha256dHash> {
|
||||
LocatorHashIter::new(self.best_tip).collect()
|
||||
}
|
||||
|
||||
/// An iterator over all blocks in the chain starting from `start_hash`
|
||||
pub fn iter(&self, start_hash: Sha256dHash) -> BlockIter {
|
||||
let start = match self.tree.lookup(&start_hash.into_le(), 256) {
|
||||
Some(boxptr) => &**boxptr as NodePtr,
|
||||
None => ptr::null()
|
||||
};
|
||||
BlockIter {
|
||||
index: start,
|
||||
marker: marker::PhantomData
|
||||
}
|
||||
}
|
||||
|
||||
/// An iterator over all blocks in reverse order to the genesis, starting with `start_hash`
|
||||
pub fn rev_iter(&self, start_hash: Sha256dHash) -> RevBlockIter {
|
||||
let start = match self.tree.lookup(&start_hash.into_le(), 256) {
|
||||
Some(boxptr) => &**boxptr as NodePtr,
|
||||
None => ptr::null()
|
||||
};
|
||||
RevBlockIter {
|
||||
index: start,
|
||||
marker: marker::PhantomData
|
||||
}
|
||||
}
|
||||
|
||||
/// An iterator over all blocks -not- in the best chain, in reverse order, starting from `start_hash`
|
||||
pub fn rev_stale_iter(&self, start_hash: Sha256dHash) -> RevStaleBlockIter {
|
||||
let start = match self.tree.lookup(&start_hash.into_le(), 256) {
|
||||
Some(boxptr) => {
|
||||
// If we are already on the main chain, we have a dead iterator
|
||||
if boxptr.is_on_main_chain(self) {
|
||||
ptr::null()
|
||||
} else {
|
||||
&**boxptr as NodePtr
|
||||
}
|
||||
}
|
||||
None => ptr::null()
|
||||
};
|
||||
RevStaleBlockIter {
|
||||
index: start,
|
||||
chain: self
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use blockdata::blockchain::Blockchain;
|
||||
use blockdata::constants::genesis_block;
|
||||
use network::constants::Network::Bitcoin;
|
||||
use network::serialize::{BitcoinHash, deserialize, serialize};
|
||||
|
||||
#[test]
|
||||
fn blockchain_serialize_test() {
|
||||
let empty_chain = Blockchain::new(Bitcoin);
|
||||
assert_eq!(empty_chain.best_tip().header.bitcoin_hash(),
|
||||
genesis_block(Bitcoin).header.bitcoin_hash());
|
||||
|
||||
let serial = serialize(&empty_chain);
|
||||
let deserial: Result<Blockchain, _> = deserialize(&serial.unwrap());
|
||||
|
||||
assert!(deserial.is_ok());
|
||||
let read_chain = deserial.unwrap();
|
||||
assert_eq!(read_chain.best_tip().header.bitcoin_hash(),
|
||||
genesis_block(Bitcoin).header.bitcoin_hash());
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
|
|
@ -23,7 +23,6 @@ pub mod opcodes;
|
|||
#[cfg(not(feature="broken_consensus_code"))] pub mod script;
|
||||
pub mod transaction;
|
||||
pub mod block;
|
||||
pub mod blockchain;
|
||||
|
||||
#[cfg(feature="broken_consensus_code")]
|
||||
/// # Script -- including consensus code
|
||||
|
|
|
|||
|
|
@ -25,7 +25,6 @@ pub mod decimal;
|
|||
pub mod hash;
|
||||
pub mod iter;
|
||||
pub mod misc;
|
||||
pub mod patricia_tree;
|
||||
pub mod uint;
|
||||
|
||||
use std::{error, fmt, io};
|
||||
|
|
|
|||
|
|
@ -1,715 +0,0 @@
|
|||
// Rust Bitcoin Library
|
||||
// Written in 2014 by
|
||||
// Andrew Poelstra <apoelstra@wpsoftware.net>
|
||||
//
|
||||
// To the extent possible under law, the author(s) have dedicated all
|
||||
// copyright and related and neighboring rights to this software to
|
||||
// the public domain worldwide. This software is distributed without
|
||||
// any warranty.
|
||||
//
|
||||
// You should have received a copy of the CC0 Public Domain Dedication
|
||||
// along with this software.
|
||||
// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
|
||||
//
|
||||
|
||||
//! # Patricia/Radix Trie
|
||||
//!
|
||||
//! A Patricia trie is a trie in which nodes with only one child are
|
||||
//! merged with the child, giving huge space savings for sparse tries.
|
||||
//! A radix tree is more general, working with keys that are arbitrary
|
||||
//! strings; a Patricia tree uses bitstrings.
|
||||
//!
|
||||
|
||||
use std::fmt::Debug;
|
||||
use std::marker;
|
||||
use std::{cmp, fmt, ops, ptr};
|
||||
|
||||
use network::encodable::{ConsensusDecodable, ConsensusEncodable};
|
||||
use network::serialize::{SimpleDecoder, SimpleEncoder};
|
||||
use util::BitArray;
|
||||
|
||||
/// Patricia troo
|
||||
pub struct PatriciaTree<K: Copy, V> {
|
||||
data: Option<V>,
|
||||
child_l: Option<Box<PatriciaTree<K, V>>>,
|
||||
child_r: Option<Box<PatriciaTree<K, V>>>,
|
||||
skip_prefix: K,
|
||||
skip_len: u8
|
||||
}
|
||||
|
||||
impl<K, V> PatriciaTree<K, V>
|
||||
where K: Copy + BitArray + cmp::Eq +
|
||||
ops::BitXor<K, Output=K> +
|
||||
ops::Add<K, Output=K> +
|
||||
ops::Shr<usize, Output=K> +
|
||||
ops::Shl<usize, Output=K>
|
||||
{
|
||||
/// Constructs a new Patricia tree
|
||||
pub fn new() -> PatriciaTree<K, V> {
|
||||
PatriciaTree {
|
||||
data: None,
|
||||
child_l: None,
|
||||
child_r: None,
|
||||
skip_prefix: BitArray::zero(),
|
||||
skip_len: 0
|
||||
}
|
||||
}
|
||||
|
||||
/// Lookup a value by exactly matching `key` and return a referenc
|
||||
pub fn lookup_mut(&mut self, key: &K, key_len: usize) -> Option<&mut V> {
|
||||
// Caution: `lookup_mut` never modifies its self parameter (in fact its
|
||||
// internal recursion uses a non-mutable self, so we are OK to just
|
||||
// transmute our self pointer into a mutable self before passing it in.
|
||||
use std::mem::transmute;
|
||||
unsafe { transmute(self.lookup(key, key_len)) }
|
||||
}
|
||||
|
||||
/// Lookup a value by exactly matching `key` and return a mutable reference
|
||||
pub fn lookup(&self, key: &K, key_len: usize) -> Option<&V> {
|
||||
let mut node = self;
|
||||
let mut key_idx = 0;
|
||||
|
||||
loop {
|
||||
// If the search key is shorter than the node prefix, there is no
|
||||
// way we can match, so fail.
|
||||
if key_len - key_idx < node.skip_len as usize {
|
||||
return None;
|
||||
}
|
||||
|
||||
// Key fails to match prefix --- no match
|
||||
if node.skip_prefix != key.bit_slice(key_idx, key_idx + node.skip_len as usize) {
|
||||
return None;
|
||||
}
|
||||
|
||||
// Key matches prefix: if they are an exact match, return the data
|
||||
if node.skip_len as usize == key_len - key_idx {
|
||||
return node.data.as_ref();
|
||||
} else {
|
||||
// Key matches prefix: search key longer than node key, recurse
|
||||
key_idx += 1 + node.skip_len as usize;
|
||||
let subtree = if key.bit(key_idx - 1) { &node.child_r } else { &node.child_l };
|
||||
match *subtree {
|
||||
Some(ref bx) => {
|
||||
node = &**bx; // bx is a &Box<U> here, so &**bx gets &U
|
||||
}
|
||||
None => { return None; }
|
||||
}
|
||||
}
|
||||
} // end loop
|
||||
}
|
||||
|
||||
/// Inserts a value with key `key`, returning true on success. If a value is already
|
||||
/// stored against `key`, do nothing and return false.
|
||||
#[inline]
|
||||
pub fn insert(&mut self, key: &K, key_len: usize, value: V) -> bool {
|
||||
self.real_insert(key, key_len, value, false)
|
||||
}
|
||||
|
||||
/// Inserts a value with key `key`, returning true on success. If a value is already
|
||||
/// stored against `key`, overwrite it and return false.
|
||||
#[inline]
|
||||
pub fn insert_or_update(&mut self, key: &K, key_len: usize, value: V) -> bool {
|
||||
self.real_insert(key, key_len, value, true)
|
||||
}
|
||||
|
||||
fn real_insert(&mut self, key: &K, key_len: usize, value: V, overwrite: bool) -> bool {
|
||||
let mut node = self;
|
||||
let mut idx = 0;
|
||||
loop {
|
||||
// Mask in case search key is shorter than node key
|
||||
let slice_len = cmp::min(node.skip_len as usize, key_len - idx);
|
||||
let masked_prefix = node.skip_prefix.mask(slice_len);
|
||||
let key_slice = key.bit_slice(idx, idx + slice_len);
|
||||
|
||||
// Prefixes do not match: split key
|
||||
if masked_prefix != key_slice {
|
||||
let diff = (masked_prefix ^ key_slice).trailing_zeros();
|
||||
|
||||
// Remove the old node's children
|
||||
let child_l = node.child_l.take();
|
||||
let child_r = node.child_r.take();
|
||||
let value_neighbor = node.data.take();
|
||||
let tmp = node; // borrowck hack
|
||||
let (insert, neighbor) = if key_slice.bit(diff)
|
||||
{ (&mut tmp.child_r, &mut tmp.child_l) }
|
||||
else { (&mut tmp.child_l, &mut tmp.child_r) };
|
||||
*insert = Some(Box::new(PatriciaTree {
|
||||
data: None,
|
||||
child_l: None,
|
||||
child_r: None,
|
||||
skip_prefix: key.bit_slice(idx + diff + 1, key_len),
|
||||
skip_len: (key_len - idx - diff - 1) as u8
|
||||
}));
|
||||
*neighbor = Some(Box::new(PatriciaTree {
|
||||
data: value_neighbor,
|
||||
child_l: child_l,
|
||||
child_r: child_r,
|
||||
skip_prefix: tmp.skip_prefix >> (diff + 1),
|
||||
skip_len: tmp.skip_len - diff as u8 - 1
|
||||
}));
|
||||
// Chop the prefix down
|
||||
tmp.skip_len = diff as u8;
|
||||
tmp.skip_prefix = tmp.skip_prefix.mask(diff);
|
||||
// Recurse
|
||||
idx += 1 + diff;
|
||||
node = &mut **insert.as_mut().unwrap();
|
||||
}
|
||||
// Prefixes match
|
||||
else {
|
||||
let slice_len = key_len - idx;
|
||||
// Search key is shorter than skip prefix: truncate the prefix and attach
|
||||
// the old data as a child
|
||||
if node.skip_len as usize > slice_len {
|
||||
// Remove the old node's children
|
||||
let child_l = node.child_l.take();
|
||||
let child_r = node.child_r.take();
|
||||
let value_neighbor = node.data.take();
|
||||
// Put the old data in a new child, with the remainder of the prefix
|
||||
let new_child = if node.skip_prefix.bit(slice_len)
|
||||
{ &mut node.child_r } else { &mut node.child_l };
|
||||
*new_child = Some(Box::new(PatriciaTree {
|
||||
data: value_neighbor,
|
||||
child_l: child_l,
|
||||
child_r: child_r,
|
||||
skip_prefix: node.skip_prefix >> (slice_len + 1),
|
||||
skip_len: node.skip_len - slice_len as u8 - 1
|
||||
}));
|
||||
// Chop the prefix down and put the new data in place
|
||||
node.skip_len = slice_len as u8;
|
||||
node.skip_prefix = key_slice;
|
||||
node.data = Some(value);
|
||||
return true;
|
||||
}
|
||||
// If we have an exact match, great, insert it
|
||||
else if node.skip_len as usize == slice_len {
|
||||
if node.data.is_none() {
|
||||
node.data = Some(value);
|
||||
return true;
|
||||
}
|
||||
if overwrite {
|
||||
node.data = Some(value);
|
||||
}
|
||||
return false;
|
||||
}
|
||||
// Search key longer than node key, recurse
|
||||
else {
|
||||
let tmp = node; // hack to appease borrowck
|
||||
idx += tmp.skip_len as usize + 1;
|
||||
let subtree = if key.bit(idx - 1)
|
||||
{ &mut tmp.child_r } else { &mut tmp.child_l };
|
||||
// Recurse, adding a new node if necessary
|
||||
if subtree.is_none() {
|
||||
*subtree = Some(Box::new(PatriciaTree {
|
||||
data: None,
|
||||
child_l: None,
|
||||
child_r: None,
|
||||
skip_prefix: key.bit_slice(idx, key_len),
|
||||
skip_len: (key_len - idx) as u8
|
||||
}));
|
||||
}
|
||||
// subtree.get_mut_ref is a &mut Box<U> here, so &mut ** gets a &mut U
|
||||
node = &mut **subtree.as_mut().unwrap();
|
||||
} // end search_len vs prefix len
|
||||
} // end if prefixes match
|
||||
} // end loop
|
||||
}
|
||||
|
||||
/// Deletes a value with key `key`, returning it on success. If no value with
|
||||
/// the given key is found, return None
|
||||
pub fn delete(&mut self, key: &K, key_len: usize) -> Option<V> {
|
||||
/// Return value is (deletable, actual return value), where `deletable` is true
|
||||
/// is true when the entire node can be deleted (i.e. it has no children)
|
||||
fn recurse<K, V>(tree: &mut PatriciaTree<K, V>, key: &K, key_len: usize) -> (bool, Option<V>)
|
||||
where K: Copy + BitArray + cmp::Eq +
|
||||
ops::Add<K, Output=K> +
|
||||
ops::Shr<usize, Output=K> +
|
||||
ops::Shl<usize, Output=K>
|
||||
{
|
||||
// If the search key is shorter than the node prefix, there is no
|
||||
// way we can match, so fail.
|
||||
if key_len < tree.skip_len as usize {
|
||||
return (false, None);
|
||||
}
|
||||
|
||||
// Key fails to match prefix --- no match
|
||||
if tree.skip_prefix != key.mask(tree.skip_len as usize) {
|
||||
return (false, None);
|
||||
}
|
||||
|
||||
// If we are here, the key matches the prefix
|
||||
if tree.skip_len as usize == key_len {
|
||||
// Exact match -- delete and return
|
||||
let ret = tree.data.take();
|
||||
let bit = tree.child_r.is_some();
|
||||
// First try to consolidate if there is only one child
|
||||
if tree.child_l.is_some() && tree.child_r.is_some() {
|
||||
// Two children means we cannot consolidate or delete
|
||||
return (false, ret);
|
||||
}
|
||||
match (tree.child_l.take(), tree.child_r.take()) {
|
||||
(Some(_), Some(_)) => unreachable!(),
|
||||
(Some(child), None) | (None, Some(child)) => {
|
||||
let child = *child; /* workaround for rustc #28536 */
|
||||
let PatriciaTree { data, child_l, child_r, skip_len, skip_prefix } = child;
|
||||
tree.data = data;
|
||||
tree.child_l = child_l;
|
||||
tree.child_r = child_r;
|
||||
let new_bit = if bit { let ret: K = BitArray::one();
|
||||
ret << (tree.skip_len as usize) }
|
||||
else { BitArray::zero() };
|
||||
tree.skip_prefix = tree.skip_prefix +
|
||||
new_bit +
|
||||
(skip_prefix << (1 + tree.skip_len as usize));
|
||||
tree.skip_len += 1 + skip_len;
|
||||
return (false, ret);
|
||||
}
|
||||
// No children means this node is deletable
|
||||
(None, None) => { return (true, ret); }
|
||||
}
|
||||
}
|
||||
|
||||
// Otherwise, the key is longer than the prefix and we need to recurse
|
||||
let next_bit = key.bit(tree.skip_len as usize);
|
||||
// Recursively get the return value. This awkward scope is required
|
||||
// to shorten the time we mutably borrow the node's children -- we
|
||||
// might want to borrow the sibling later, so the borrow needs to end.
|
||||
let ret = {
|
||||
let target = if next_bit { &mut tree.child_r } else { &mut tree.child_l };
|
||||
|
||||
// If we can't recurse, fail
|
||||
if target.is_none() {
|
||||
return (false, None);
|
||||
}
|
||||
// Otherwise, do it
|
||||
let (delete_child, ret) = recurse(&mut **target.as_mut().unwrap(),
|
||||
&(*key >> (tree.skip_len as usize + 1)),
|
||||
key_len - tree.skip_len as usize - 1);
|
||||
if delete_child {
|
||||
target.take();
|
||||
}
|
||||
ret
|
||||
};
|
||||
|
||||
// The above block may have deleted the target. If we now have only one
|
||||
// child, merge it into the parent. (If we have no children, mark this
|
||||
// node for deletion.)
|
||||
if tree.data.is_some() {
|
||||
// First though, if this is a data node, we can neither delete nor
|
||||
// consolidate it.
|
||||
return (false, ret);
|
||||
}
|
||||
|
||||
match (tree.child_r.is_some(), tree.child_l.take(), tree.child_r.take()) {
|
||||
// Two children? Can't do anything, just sheepishly put them back
|
||||
(_, Some(child_l), Some(child_r)) => {
|
||||
tree.child_l = Some(child_l);
|
||||
tree.child_r = Some(child_r);
|
||||
(false, ret)
|
||||
}
|
||||
// One child? Consolidate
|
||||
(bit, Some(child), None) | (bit, None, Some(child)) => {
|
||||
let child = *child; /* workaround for rustc #28536 */
|
||||
let PatriciaTree { data, child_l, child_r, skip_len, skip_prefix } = child;
|
||||
tree.data = data;
|
||||
tree.child_l = child_l;
|
||||
tree.child_r = child_r;
|
||||
let new_bit = if bit { let ret: K = BitArray::one();
|
||||
ret << (tree.skip_len as usize) }
|
||||
else { BitArray::zero() };
|
||||
tree.skip_prefix = tree.skip_prefix +
|
||||
new_bit +
|
||||
(skip_prefix << (1 + tree.skip_len as usize));
|
||||
tree.skip_len += 1 + skip_len;
|
||||
(false, ret)
|
||||
}
|
||||
// No children? Delete
|
||||
(_, None, None) => {
|
||||
(true, ret)
|
||||
}
|
||||
}
|
||||
}
|
||||
let (_, ret) = recurse(self, key, key_len);
|
||||
ret
|
||||
}
|
||||
|
||||
/// Count all the nodes
|
||||
pub fn node_count(&self) -> usize {
|
||||
fn recurse<K: Copy, V>(node: &Option<Box<PatriciaTree<K, V>>>) -> usize {
|
||||
match *node {
|
||||
Some(ref node) => { 1 + recurse(&node.child_l) + recurse(&node.child_r) }
|
||||
None => 0
|
||||
}
|
||||
}
|
||||
1 + recurse(&self.child_l) + recurse(&self.child_r)
|
||||
}
|
||||
|
||||
/// Returns an iterator over all elements in the tree
|
||||
pub fn iter(&self) -> Items<K, V> {
|
||||
Items {
|
||||
node: Some(self),
|
||||
parents: vec![],
|
||||
started: false
|
||||
}
|
||||
}
|
||||
|
||||
/// Returns a mutable iterator over all elements in the tree
|
||||
pub fn mut_iter(&mut self) -> MutItems<K, V> {
|
||||
MutItems {
|
||||
node: self as *mut _,
|
||||
parents: vec![],
|
||||
started: false,
|
||||
marker: marker::PhantomData
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl<K: Copy + BitArray, V: Debug> Debug for PatriciaTree<K, V> {
|
||||
/// Print the entire tree
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
|
||||
fn recurse<K, V>(tree: &PatriciaTree<K, V>, f: &mut fmt::Formatter, depth: usize) -> Result<(), fmt::Error>
|
||||
where K: Copy + BitArray, V: Debug
|
||||
{
|
||||
for i in 0..tree.skip_len as usize {
|
||||
try!(write!(f, "{:}", if tree.skip_prefix.bit(i) { 1 } else { 0 }));
|
||||
}
|
||||
try!(writeln!(f, ": {:?}", tree.data));
|
||||
// left gets no indentation
|
||||
if let Some(ref t) = tree.child_l {
|
||||
for _ in 0..(depth + tree.skip_len as usize) {
|
||||
try!(write!(f, "-"));
|
||||
}
|
||||
try!(write!(f, "0"));
|
||||
try!(recurse(&**t, f, depth + tree.skip_len as usize + 1));
|
||||
}
|
||||
// right one gets indentation
|
||||
if let Some(ref t) = tree.child_r {
|
||||
for _ in 0..(depth + tree.skip_len as usize) {
|
||||
try!(write!(f, "_"));
|
||||
}
|
||||
try!(write!(f, "1"));
|
||||
try!(recurse(&**t, f, depth + tree.skip_len as usize + 1));
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
recurse(self, f, 0)
|
||||
}
|
||||
}
|
||||
|
||||
impl<S, K, V> ConsensusEncodable<S> for PatriciaTree<K, V>
|
||||
where S: SimpleEncoder,
|
||||
K: Copy + ConsensusEncodable<S>,
|
||||
V: ConsensusEncodable<S>
|
||||
{
|
||||
fn consensus_encode(&self, s: &mut S) -> Result<(), S::Error> {
|
||||
// Depth-first serialization: serialize self, then children
|
||||
try!(self.skip_prefix.consensus_encode(s));
|
||||
try!(self.skip_len.consensus_encode(s));
|
||||
try!(self.data.consensus_encode(s));
|
||||
try!(self.child_l.consensus_encode(s));
|
||||
try!(self.child_r.consensus_encode(s));
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
impl<D, K, V> ConsensusDecodable<D> for PatriciaTree<K, V>
|
||||
where D: SimpleDecoder,
|
||||
K: Copy + ConsensusDecodable<D>,
|
||||
V: ConsensusDecodable<D>
|
||||
{
|
||||
fn consensus_decode(d: &mut D) -> Result<PatriciaTree<K, V>, D::Error> {
|
||||
Ok(PatriciaTree {
|
||||
skip_prefix: try!(ConsensusDecodable::consensus_decode(d)),
|
||||
skip_len: try!(ConsensusDecodable::consensus_decode(d)),
|
||||
data: try!(ConsensusDecodable::consensus_decode(d)),
|
||||
child_l: try!(ConsensusDecodable::consensus_decode(d)),
|
||||
child_r: try!(ConsensusDecodable::consensus_decode(d))
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
/// Iterator
|
||||
pub struct Items<'tree, K: Copy + 'tree, V: 'tree> {
|
||||
started: bool,
|
||||
node: Option<&'tree PatriciaTree<K, V>>,
|
||||
parents: Vec<&'tree PatriciaTree<K, V>>
|
||||
}
|
||||
|
||||
/// Mutable iterator
|
||||
pub struct MutItems<'tree, K: Copy + 'tree, V: 'tree> {
|
||||
started: bool,
|
||||
node: *mut PatriciaTree<K, V>,
|
||||
parents: Vec<*mut PatriciaTree<K, V>>,
|
||||
marker: marker::PhantomData<&'tree PatriciaTree<K, V>>
|
||||
}
|
||||
|
||||
impl<'a, K: Copy, V> Iterator for Items<'a, K, V> {
|
||||
type Item = &'a V;
|
||||
|
||||
fn next(&mut self) -> Option<&'a V> {
|
||||
fn borrow_opt<K: Copy, V>(opt_ptr: &Option<Box<PatriciaTree<K, V>>>) -> Option<&PatriciaTree<K, V>> {
|
||||
opt_ptr.as_ref().map(|b| &**b)
|
||||
}
|
||||
|
||||
// If we haven't started, maybe return the "last" return value,
|
||||
// which will be the root node.
|
||||
if !self.started {
|
||||
if self.node.is_some() && (**self.node.as_ref().unwrap()).data.is_some() {
|
||||
return self.node.unwrap().data.as_ref();
|
||||
}
|
||||
self.started = true;
|
||||
}
|
||||
|
||||
// Find next data-containing node
|
||||
while self.node.is_some() {
|
||||
let mut node = self.node.take();
|
||||
// Try to go left
|
||||
let child_l = borrow_opt(&node.unwrap().child_l);
|
||||
if child_l.is_some() {
|
||||
self.parents.push(node.unwrap());
|
||||
self.node = child_l;
|
||||
// Try to go right, going back up the tree if necessary
|
||||
} else {
|
||||
while node.is_some() {
|
||||
let child_r = borrow_opt(&node.unwrap().child_r);
|
||||
if child_r.is_some() {
|
||||
self.node = child_r;
|
||||
break;
|
||||
}
|
||||
node = self.parents.pop();
|
||||
}
|
||||
}
|
||||
// Stop if we've found data.
|
||||
if self.node.is_some() && self.node.unwrap().data.is_some() {
|
||||
break;
|
||||
}
|
||||
} // end loop
|
||||
// Return data
|
||||
self.node.and_then(|node| node.data.as_ref())
|
||||
}
|
||||
}
|
||||
|
||||
impl<'a, K: Copy, V> Iterator for MutItems<'a, K, V> {
|
||||
type Item = &'a mut V;
|
||||
|
||||
fn next(&mut self) -> Option<&'a mut V> {
|
||||
fn borrow_opt<K: Copy, V>(opt_ptr: &Option<Box<PatriciaTree<K, V>>>) -> *mut PatriciaTree<K, V> {
|
||||
match *opt_ptr {
|
||||
Some(ref data) => &**data as *const _ as *mut _,
|
||||
None => ptr::null_mut()
|
||||
}
|
||||
}
|
||||
|
||||
// If we haven't started, maybe return the "last" return value,
|
||||
// which will be the root node.
|
||||
if !self.started {
|
||||
unsafe {
|
||||
if !self.node.is_null() && (*self.node).data.is_some() {
|
||||
return (*self.node).data.as_mut();
|
||||
}
|
||||
}
|
||||
self.started = true;
|
||||
}
|
||||
|
||||
// Find next data-containing node
|
||||
while !self.node.is_null() {
|
||||
// Try to go left
|
||||
let child_l = unsafe { borrow_opt(&(*self.node).child_l) };
|
||||
if !child_l.is_null() {
|
||||
self.parents.push(self.node);
|
||||
self.node = child_l;
|
||||
// Try to go right, going back up the tree if necessary
|
||||
} else {
|
||||
while !self.node.is_null() {
|
||||
let child_r = unsafe { borrow_opt(&(*self.node).child_r) };
|
||||
if !child_r.is_null() {
|
||||
self.node = child_r;
|
||||
break;
|
||||
}
|
||||
self.node = self.parents.pop().unwrap_or(ptr::null_mut());
|
||||
}
|
||||
}
|
||||
// Stop if we've found data.
|
||||
if !self.node.is_null() && unsafe { (*self.node).data.is_some() } {
|
||||
break;
|
||||
}
|
||||
} // end loop
|
||||
// Return data
|
||||
if !self.node.is_null() {
|
||||
unsafe { (*self.node).data.as_mut() }
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use network::serialize::{deserialize, serialize};
|
||||
use util::hash::Sha256dHash;
|
||||
use util::uint::Uint128;
|
||||
use util::uint::Uint256;
|
||||
use util::patricia_tree::PatriciaTree;
|
||||
use util::BitArray;
|
||||
|
||||
#[test]
|
||||
fn patricia_single_insert_lookup_delete_test() {
|
||||
let mut key = Uint256::from_u64(0xDEADBEEFDEADBEEF).unwrap();
|
||||
key = key + (key << 64);
|
||||
|
||||
let mut tree = PatriciaTree::new();
|
||||
tree.insert(&key, 100, 100u32);
|
||||
tree.insert(&key, 120, 100u32);
|
||||
|
||||
assert_eq!(tree.lookup(&key, 100), Some(&100u32));
|
||||
assert_eq!(tree.lookup(&key, 101), None);
|
||||
assert_eq!(tree.lookup(&key, 99), None);
|
||||
assert_eq!(tree.delete(&key, 100), Some(100u32));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn patricia_insert_lookup_delete_test() {
|
||||
let mut tree = PatriciaTree::new();
|
||||
let mut hashes = vec![];
|
||||
for i in 0u32..5000 {
|
||||
let hash = Sha256dHash::from_data(&[(i / 0x100) as u8, (i % 0x100) as u8]).into_le().low_128();
|
||||
tree.insert(&hash, 250, i);
|
||||
hashes.push(hash);
|
||||
}
|
||||
|
||||
// Check that all inserts are correct
|
||||
for (n, hash) in hashes.iter().enumerate() {
|
||||
let ii = n as u32;
|
||||
let ret = tree.lookup(hash, 250);
|
||||
assert_eq!(ret, Some(&ii));
|
||||
}
|
||||
|
||||
// Delete all the odd-numbered nodes
|
||||
for (n, hash) in hashes.iter().enumerate() {
|
||||
if n % 2 == 1 {
|
||||
let ii = n as u32;
|
||||
let ret = tree.delete(hash, 250);
|
||||
assert_eq!(ret, Some(ii));
|
||||
}
|
||||
}
|
||||
|
||||
// Confirm all is correct
|
||||
for (n, hash) in hashes.iter().enumerate() {
|
||||
let ii = n as u32;
|
||||
let ret = tree.lookup(hash, 250);
|
||||
if n % 2 == 0 {
|
||||
assert_eq!(ret, Some(&ii));
|
||||
} else {
|
||||
assert_eq!(ret, None);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn patricia_insert_substring_keys() {
|
||||
// This test uses a bunch of keys that are substrings of each other
|
||||
// to make sure insertion and deletion does not lose data
|
||||
let mut tree = PatriciaTree::new();
|
||||
let mut hashes = vec![];
|
||||
// Start by inserting a bunch of chunder
|
||||
for i in 1u32..500 {
|
||||
let hash = Sha256dHash::from_data(&[(i / 0x100) as u8, (i % 0x100) as u8]).into_le().low_128();
|
||||
tree.insert(&hash, 128, i * 1000);
|
||||
hashes.push(hash);
|
||||
}
|
||||
// Do the actual test -- note that we also test insertion and deletion
|
||||
// at the root here.
|
||||
for i in 0u32..10 {
|
||||
tree.insert(&BitArray::zero(), i as usize, i);
|
||||
}
|
||||
for i in 0u32..10 {
|
||||
let m = tree.lookup(&BitArray::zero(), i as usize);
|
||||
assert_eq!(m, Some(&i));
|
||||
}
|
||||
for i in 0u32..10 {
|
||||
let m = tree.delete(&BitArray::zero(), i as usize);
|
||||
assert_eq!(m, Some(i));
|
||||
}
|
||||
// Check that the chunder was unharmed
|
||||
for (n, hash) in hashes.iter().enumerate() {
|
||||
let ii = ((n + 1) * 1000) as u32;
|
||||
let ret = tree.lookup(hash, 128);
|
||||
assert_eq!(ret, Some(&ii));
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn patricia_iter_test() {
|
||||
let n_elems = 5000;
|
||||
let mut tree = PatriciaTree::new();
|
||||
let mut data = vec![None; n_elems];
|
||||
// Start by inserting a bunch of stuff
|
||||
for i in 0..n_elems {
|
||||
let hash = Sha256dHash::from_data(&[(i / 0x100) as u8, (i % 0x100) as u8]).into_le().low_128();
|
||||
tree.insert(&hash, 128, i);
|
||||
data[i] = Some(());
|
||||
}
|
||||
|
||||
// Iterate over and try to get everything
|
||||
for n in tree.iter() {
|
||||
assert!(data[*n].is_some());
|
||||
data[*n] = None;
|
||||
}
|
||||
|
||||
// Check that we got everything
|
||||
assert!(data.iter().all(|opt| opt.is_none()));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn patricia_mut_iter_test() {
|
||||
let n_elems = 5000;
|
||||
let mut tree = PatriciaTree::new();
|
||||
let mut data = vec![None; n_elems];
|
||||
// Start by inserting a bunch of stuff
|
||||
for i in 0..n_elems {
|
||||
let hash = Sha256dHash::from_data(&[(i / 0x100) as u8, (i % 0x100) as u8]).into_le().low_128();
|
||||
tree.insert(&hash, 128, i);
|
||||
data[i] = Some(());
|
||||
}
|
||||
|
||||
// Iterate over and flip all the values
|
||||
for n in tree.mut_iter() {
|
||||
*n = n_elems - *n - 1;
|
||||
}
|
||||
|
||||
// Iterate over and try to get everything
|
||||
for n in tree.mut_iter() {
|
||||
assert!(data[*n].is_some());
|
||||
data[*n] = None;
|
||||
}
|
||||
|
||||
// Check that we got everything
|
||||
assert!(data.iter().all(|opt| opt.is_none()));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn patricia_serialize_test() {
|
||||
// Build a tree
|
||||
let mut tree = PatriciaTree::new();
|
||||
let mut hashes = vec![];
|
||||
for i in 0u32..5000 {
|
||||
let hash = Sha256dHash::from_data(&[(i / 0x100) as u8, (i % 0x100) as u8]).into_le().low_128();
|
||||
tree.insert(&hash, 250, i);
|
||||
hashes.push(hash);
|
||||
}
|
||||
|
||||
// Serialize it
|
||||
let serialized = serialize(&tree).unwrap();
|
||||
// Deserialize it
|
||||
let deserialized: Result<PatriciaTree<Uint128, u32>, _> = deserialize(&serialized);
|
||||
assert!(deserialized.is_ok());
|
||||
let new_tree = deserialized.unwrap();
|
||||
|
||||
// Check that all inserts are still there
|
||||
for (n, hash) in hashes.iter().enumerate() {
|
||||
let ii = n as u32;
|
||||
let ret = new_tree.lookup(hash, 250);
|
||||
assert_eq!(ret, Some(&ii));
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue