119 lines
3.9 KiB
Rust
119 lines
3.9 KiB
Rust
// Copyright 2015-2017 Parity Technologies (UK) Ltd.
|
|
// This file is part of Parity.
|
|
|
|
// Parity is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
|
|
// Parity is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with Parity. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
//! Key-value datastore with a modified Merkle tree.
|
|
use keccak::keccak;
|
|
use bytes::*;
|
|
use bigint::hash::*;
|
|
use rlp::encode;
|
|
|
|
/// Alphabet to use when creating words for insertion into tries.
|
|
pub enum Alphabet {
|
|
/// All values are allowed in each bytes of the key.
|
|
All,
|
|
/// Only a 6 values ('a' - 'f') are chosen to compose the key.
|
|
Low,
|
|
/// Quite a few values (around 32) are chosen to compose the key.
|
|
Mid,
|
|
/// A set of bytes given is used to compose the key.
|
|
Custom(Bytes),
|
|
}
|
|
|
|
/// Means of determining the value.
|
|
pub enum ValueMode {
|
|
/// Same as the key.
|
|
Mirror,
|
|
/// Randomly (50:50) 1 or 32 byte randomly string.
|
|
Random,
|
|
/// RLP-encoded index.
|
|
Index,
|
|
}
|
|
|
|
/// Standard test map for profiling tries.
|
|
pub struct StandardMap {
|
|
/// The alphabet to use for keys.
|
|
pub alphabet: Alphabet,
|
|
/// Minimum size of key.
|
|
pub min_key: usize,
|
|
/// Delta size of key.
|
|
pub journal_key: usize,
|
|
/// Mode of value generation.
|
|
pub value_mode: ValueMode,
|
|
/// Number of keys.
|
|
pub count: usize,
|
|
}
|
|
|
|
impl StandardMap {
|
|
/// Get a bunch of random bytes, at least `min_count` bytes, at most `min_count` + `journal_count` bytes.
|
|
/// `seed` is mutated pseudoramdonly and used.
|
|
fn random_bytes(min_count: usize, journal_count: usize, seed: &mut H256) -> Vec<u8> {
|
|
assert!(min_count + journal_count <= 32);
|
|
*seed = keccak(&seed);
|
|
let r = min_count + (seed[31] as usize % (journal_count + 1));
|
|
seed[0..r].to_vec()
|
|
}
|
|
|
|
/// Get a random value. Equal chance of being 1 byte as of 32. `seed` is mutated pseudoramdonly and used.
|
|
fn random_value(seed: &mut H256) -> Bytes {
|
|
*seed = keccak(&seed);
|
|
match seed[0] % 2 {
|
|
1 => vec![seed[31];1],
|
|
_ => seed.to_vec(),
|
|
}
|
|
}
|
|
|
|
/// Get a random word of, at least `min_count` bytes, at most `min_count` + `journal_count` bytes.
|
|
/// Each byte is an item from `alphabet`. `seed` is mutated pseudoramdonly and used.
|
|
fn random_word(alphabet: &[u8], min_count: usize, journal_count: usize, seed: &mut H256) -> Vec<u8> {
|
|
assert!(min_count + journal_count <= 32);
|
|
*seed = keccak(&seed);
|
|
let r = min_count + (seed[31] as usize % (journal_count + 1));
|
|
let mut ret: Vec<u8> = Vec::with_capacity(r);
|
|
for i in 0..r {
|
|
ret.push(alphabet[seed[i] as usize % alphabet.len()]);
|
|
}
|
|
ret
|
|
}
|
|
|
|
/// Create the standard map (set of keys and values) for the object's fields.
|
|
pub fn make(&self) -> Vec<(Bytes, Bytes)> {
|
|
self.make_with(&mut H256::new())
|
|
}
|
|
|
|
/// Create the standard map (set of keys and values) for the object's fields, using the given seed.
|
|
pub fn make_with(&self, seed: &mut H256) -> Vec<(Bytes, Bytes)> {
|
|
let low = b"abcdef";
|
|
let mid = b"@QWERTYUIOPASDFGHJKLZXCVBNM[/]^_";
|
|
|
|
let mut d: Vec<(Bytes, Bytes)> = Vec::new();
|
|
for index in 0..self.count {
|
|
let k = match self.alphabet {
|
|
Alphabet::All => Self::random_bytes(self.min_key, self.journal_key, seed),
|
|
Alphabet::Low => Self::random_word(low, self.min_key, self.journal_key, seed),
|
|
Alphabet::Mid => Self::random_word(mid, self.min_key, self.journal_key, seed),
|
|
Alphabet::Custom(ref a) => Self::random_word(a, self.min_key, self.journal_key, seed),
|
|
};
|
|
let v = match self.value_mode {
|
|
ValueMode::Mirror => k.clone(),
|
|
ValueMode::Random => Self::random_value(seed),
|
|
ValueMode::Index => encode(&index).into_vec(),
|
|
};
|
|
d.push((k, v))
|
|
}
|
|
d
|
|
}
|
|
}
|