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use std::collections::HashMap;
use util::Bytes;
use util::{Address, FixedHash, H256};
use util::kvdb::Database;
use util::migration::{Batch, Config, Error, Migration, SimpleMigration, Progress};
use util::sha3::Hashable;
use std::sync::Arc;
use rlp::{decode, Rlp, RlpStream, Stream, View};
fn attempt_migrate(mut key_h: H256, val: &[u8]) -> Option<H256> {
let val_hash = val.sha3();
if key_h != val_hash {
let address = key_h ^ val_hash;
if &address[0..12] != &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] {
return None;
}
let address_hash = Address::from(address).sha3();
key_h.copy_from_slice(&*val_hash);
assert_eq!(key_h, val_hash);
{
let last_src: &[u8] = &*address_hash;
let last_dst: &mut [u8] = &mut *key_h;
for (k, a) in last_dst[12..].iter_mut().zip(&last_src[12..]) {
*k ^= *a;
}
}
Some(key_h)
} else {
None
}
}
#[derive(Default)]
pub struct ArchiveV7(Progress);
impl SimpleMigration for ArchiveV7 {
fn columns(&self) -> Option<u32> { None }
fn version(&self) -> u32 { 7 }
fn simple_migrate(&mut self, key: Vec<u8>, value: Vec<u8>) -> Option<(Vec<u8>, Vec<u8>)> {
self.0.tick();
if key.len() != 32 {
return Some((key, value));
}
let key_h = H256::from_slice(&key[..]);
if let Some(new_key) = attempt_migrate(key_h, &value[..]) {
Some((new_key[..].to_owned(), value))
} else {
Some((key, value))
}
}
}
const V7_LATEST_ERA_KEY: &'static [u8] = &[ b'l', b'a', b's', b't', 0, 0, 0, 0, 0, 0, 0, 0 ];
const V7_VERSION_KEY: &'static [u8] = &[ b'j', b'v', b'e', b'r', 0, 0, 0, 0, 0, 0, 0, 0 ];
const DB_VERSION: u32 = 0x203;
const PADDING : [u8; 10] = [0u8; 10];
#[derive(Default)]
pub struct OverlayRecentV7 {
migrated_keys: HashMap<H256, H256>,
}
impl OverlayRecentV7 {
fn walk_journal(&mut self, source: Arc<Database>) -> Result<(), Error> {
if let Some(val) = source.get(None, V7_LATEST_ERA_KEY).map_err(Error::Custom)? {
let mut era = decode::<u64>(&val);
loop {
let mut index: usize = 0;
loop {
let entry_key = {
let mut r = RlpStream::new_list(3);
r.append(&era).append(&index).append(&&PADDING[..]);
r.out()
};
if let Some(journal_raw) = source.get(None, &entry_key).map_err(Error::Custom)? {
let rlp = Rlp::new(&journal_raw);
for r in rlp.at(1).iter() {
let key: H256 = r.val_at(0);
let v: Bytes = r.val_at(1);
if self.migrated_keys.get(&key).is_none() {
if let Some(new_key) = attempt_migrate(key, &v) {
self.migrated_keys.insert(key, new_key);
}
}
}
index += 1;
} else {
break;
}
}
if index == 0 || era == 0 {
break;
}
era -= 1;
}
}
Ok(())
}
fn migrate_journal(&self, source: Arc<Database>, mut batch: Batch, dest: &mut Database) -> Result<(), Error> {
if let Some(val) = source.get(None, V7_LATEST_ERA_KEY).map_err(Error::Custom)? {
batch.insert(V7_LATEST_ERA_KEY.into(), val.clone().to_vec(), dest)?;
let mut era = decode::<u64>(&val);
loop {
let mut index: usize = 0;
loop {
let entry_key = {
let mut r = RlpStream::new_list(3);
r.append(&era).append(&index).append(&&PADDING[..]);
r.out()
};
if let Some(journal_raw) = source.get(None, &entry_key).map_err(Error::Custom)? {
let rlp = Rlp::new(&journal_raw);
let id: H256 = rlp.val_at(0);
let mut inserted_keys: Vec<(H256, Bytes)> = Vec::new();
for r in rlp.at(1).iter() {
let mut key: H256 = r.val_at(0);
let v: Bytes = r.val_at(1);
if let Some(new_key) = self.migrated_keys.get(&key) {
key = *new_key;
}
inserted_keys.push((key, v));
}
let mut deleted_keys: Vec<H256> = rlp.val_at(2);
for old_key in &mut deleted_keys {
if let Some(new) = self.migrated_keys.get(&*old_key) {
*old_key = new.clone();
}
}
let mut stream = RlpStream::new_list(3);
stream.append(&id);
stream.begin_list(inserted_keys.len());
for (k, v) in inserted_keys {
stream.begin_list(2).append(&k).append(&v);
}
stream.append(&deleted_keys);
batch.insert(entry_key, stream.out(), dest)?;
index += 1;
} else {
break;
}
}
if index == 0 || era == 0 {
break;
}
era -= 1;
}
}
batch.commit(dest)
}
}
impl Migration for OverlayRecentV7 {
fn columns(&self) -> Option<u32> { None }
fn version(&self) -> u32 { 7 }
fn migrate(&mut self, source: Arc<Database>, config: &Config, dest: &mut Database, col: Option<u32>) -> Result<(), Error> {
let mut batch = Batch::new(config, col);
match source.get(None, V7_VERSION_KEY).map_err(Error::Custom)? {
Some(ref version) if decode::<u32>(&*version) == DB_VERSION => {}
_ => return Err(Error::MigrationImpossible),
}
let mut count = 0;
for (key, value) in source.iter(None) {
count += 1;
if count == 100_000 {
count = 0;
flush!(".");
}
let mut key = key.into_vec();
if key.len() == 32 {
let key_h = H256::from_slice(&key[..]);
if let Some(new_key) = attempt_migrate(key_h.clone(), &value) {
self.migrated_keys.insert(key_h, new_key);
key.copy_from_slice(&new_key[..]);
}
}
batch.insert(key, value.into_vec(), dest)?;
}
self.walk_journal(source.clone())?;
self.migrate_journal(source, batch, dest)
}
}