openethereum/util/src/memorydb.rs

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//! Reference-counted memory-based HashDB implementation.
use hash::*;
use bytes::*;
use rlp::*;
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use sha3::*;
use hashdb::*;
use std::mem;
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use std::collections::HashMap;
#[derive(Debug,Clone)]
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/// Reference-counted memory-based HashDB implementation.
///
/// Use `new()` to create a new database. Insert items with `insert()`, remove items
/// with `kill()`, check for existance with `exists()` and lookup a hash to derive
/// the data with `lookup()`. Clear with `clear()` and purge the portions of the data
/// that have no references with `purge()`.
///
/// # Example
/// ```rust
/// extern crate ethcore_util;
/// use ethcore_util::hashdb::*;
/// use ethcore_util::memorydb::*;
/// fn main() {
/// let mut m = MemoryDB::new();
/// let d = "Hello world!".as_bytes();
///
/// let k = m.insert(d);
/// assert!(m.exists(&k));
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/// assert_eq!(m.lookup(&k).unwrap(), d);
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///
/// m.insert(d);
/// assert!(m.exists(&k));
///
/// m.kill(&k);
/// assert!(m.exists(&k));
///
/// m.kill(&k);
/// assert!(!m.exists(&k));
///
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/// m.kill(&k);
/// assert!(!m.exists(&k));
///
/// m.insert(d);
/// assert!(!m.exists(&k));
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/// m.insert(d);
/// assert!(m.exists(&k));
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/// assert_eq!(m.lookup(&k).unwrap(), d);
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///
/// m.kill(&k);
/// assert!(!m.exists(&k));
/// }
/// ```
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pub struct MemoryDB {
data: HashMap<H256, (Bytes, i32)>,
static_null_rlp: (Bytes, i32),
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}
impl MemoryDB {
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/// Create a new instance of the memory DB.
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pub fn new() -> MemoryDB {
MemoryDB {
data: HashMap::new(),
static_null_rlp: (vec![0x80u8; 1], 1),
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}
}
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/// Clear all data from the database.
///
/// # Examples
/// ```rust
/// extern crate ethcore_util;
/// use ethcore_util::hashdb::*;
/// use ethcore_util::memorydb::*;
/// fn main() {
/// let mut m = MemoryDB::new();
/// let hello_bytes = "Hello world!".as_bytes();
/// let hash = m.insert(hello_bytes);
/// assert!(m.exists(&hash));
/// m.clear();
/// assert!(!m.exists(&hash));
/// }
/// ```
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pub fn clear(&mut self) {
self.data.clear();
}
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/// Purge all zero-referenced data from the database.
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pub fn purge(&mut self) {
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let empties: Vec<_> = self.data.iter()
.filter(|&(_, &(_, rc))| rc == 0)
.map(|(k, _)| k.clone())
.collect();
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for empty in empties { self.data.remove(&empty); }
}
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/// Grab the raw information associated with a key. Returns None if the key
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/// doesn't exist.
///
/// Even when Some is returned, the data is only guaranteed to be useful
/// when the refs > 0.
pub fn raw(&self, key: &H256) -> Option<&(Bytes, i32)> {
if key == &SHA3_NULL_RLP {
return Some(&self.static_null_rlp);
}
self.data.get(key)
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}
/// Return the internal map of hashes to data, clearing the current state.
pub fn drain(&mut self) -> HashMap<H256, (Bytes, i32)> {
let mut data = HashMap::new();
mem::swap(&mut self.data, &mut data);
data
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}
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/// Denote than an existing value has the given key. Used when a key gets removed without
/// a prior insert and thus has a negative reference with no value.
///
/// May safely be called even if the key's value is known, in which case it will be a no-op.
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pub fn denote(&self, key: &H256, value: Bytes) -> &(Bytes, i32) {
if self.raw(key) == None {
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unsafe {
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let p = &self.data as *const HashMap<H256, (Bytes, i32)> as *mut HashMap<H256, (Bytes, i32)>;
(*p).insert(key.clone(), (value, 0));
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}
}
self.raw(key).unwrap()
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}
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}
static NULL_RLP_STATIC: [u8; 1] = [0x80; 1];
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impl HashDB for MemoryDB {
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fn lookup(&self, key: &H256) -> Option<&[u8]> {
if key == &SHA3_NULL_RLP {
return Some(&NULL_RLP_STATIC);
}
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match self.data.get(key) {
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Some(&(ref d, rc)) if rc > 0 => Some(d),
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_ => None
}
}
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fn keys(&self) -> HashMap<H256, i32> {
self.data.iter().filter_map(|(k, v)| if v.1 != 0 {Some((k.clone(), v.1))} else {None}).collect()
}
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fn exists(&self, key: &H256) -> bool {
if key == &SHA3_NULL_RLP {
return true;
}
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match self.data.get(key) {
Some(&(_, x)) if x > 0 => true,
_ => false
}
}
fn insert(&mut self, value: &[u8]) -> H256 {
if value == &NULL_RLP {
return SHA3_NULL_RLP.clone();
}
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let key = value.sha3();
if match self.data.get_mut(&key) {
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Some(&mut (ref mut old_value, ref mut rc @ -0x80000000i32 ... 0)) => {
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*old_value = From::from(value.bytes());
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*rc += 1;
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false
},
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Some(&mut (_, ref mut x)) => { *x += 1; false } ,
None => true,
}{ // ... None falls through into...
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self.data.insert(key.clone(), (From::from(value.bytes()), 1));
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}
key
}
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fn emplace(&mut self, key: H256, value: Bytes) {
if value == &NULL_RLP {
return;
}
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match self.data.get_mut(&key) {
Some(&mut (ref mut old_value, ref mut rc @ -0x80000000i32 ... 0)) => {
*old_value = value;
*rc += 1;
return;
},
Some(&mut (_, ref mut x)) => { *x += 1; return; } ,
None => {},
}
// ... None falls through into...
self.data.insert(key, (value, 1));
}
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fn kill(&mut self, key: &H256) {
if key == &SHA3_NULL_RLP {
return;
}
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if match self.data.get_mut(key) {
Some(&mut (_, ref mut x)) => { *x -= 1; false }
None => true
}{ // ... None falls through into...
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self.data.insert(key.clone(), (Bytes::new(), -1));
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}
}
}
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#[test]
fn memorydb_denote() {
let mut m = MemoryDB::new();
let hello_bytes = b"Hello world!";
let hash = m.insert(hello_bytes);
assert_eq!(m.lookup(&hash).unwrap(), b"Hello world!");
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for _ in 0..1000 {
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let r = H256::random();
let k = r.sha3();
let &(ref v, ref rc) = m.denote(&k, r.bytes().to_vec());
assert_eq!(v, &r.bytes());
assert_eq!(*rc, 0);
}
assert_eq!(m.lookup(&hash).unwrap(), b"Hello world!");
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}