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Fix key collision for child trie (#4162)

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* In progress, runtime io must switch to future proof root +
child_specific (unique id) + u32 type.

* Switch interface, sr-io seems ok, rpc could use similar interface to
sr-io, genesis json broken if there is child trie in existing encoding
genesis.

* test from previous implementation.

* fix proving test.

* Restore Keyspacedb from other branch, only apply to child trie.

* Removing unneeded child_info from child root (child info are stored
if things changed, otherwhise the root does not change).

* Switch rpc to use same format as ext: more future proof.

* use root from child info for trie backend essence.

* Breaking long lines.

* Update doc and clean pr a bit.

* fix error type

* Restore removed doc on merge and update sr-io doc.

* Switch child storage api to use directly unique id, if managed id
where to be put in place, the api will change at this time.

* Clean deprecated host interface from child.

* Removing assertion on child info (can fail depending on root
memoization).

* merging child info in the overlay when possible.

* child iteration by prefix using child_info.

* Using ChainInfo in frame support. ChainInfo gets redesign to avoid
buffers allocation on every calls.

* Add length of root to the data of child info.

* comments

* Encode compact.

* Remove child info with root.

* Fix try_update condition.

* Comment Ext child root caching.

* Replace tuples by struct with field

* remove StorageTuple alias.

* Fix doc tests, and remove StorageOverlay and ChildStorageOverlay
aliases.
This commit is contained in:
cheme
2019-12-14 03:11:19 +01:00
committed by Gavin Wood
parent 7121837f84
commit 0ece5d9e17
53 changed files with 2121 additions and 918 deletions
Download Patch File Download Diff File Expand all files Collapse all files
substrate/primitives/state-machine/src/trie_backend_essence.rs
+71 -21
View File
@@ -23,9 +23,10 @@ use log::{debug, warn};
use hash_db::{self, Hasher, EMPTY_PREFIX, Prefix};
use trie::{Trie, MemoryDB, PrefixedMemoryDB, DBValue,
default_child_trie_root, read_trie_value, read_child_trie_value,
for_keys_in_child_trie};
for_keys_in_child_trie, KeySpacedDB};
use trie::trie_types::{TrieDB, TrieError, Layout};
use crate::backend::Consolidate;
use primitives::storage::ChildInfo;
use codec::Encode;
/// Patricia trie-based storage trait.
@@ -67,7 +68,7 @@ impl<S: TrieBackendStorage<H>, H: Hasher> TrieBackendEssence<S, H> where H::Out:
/// Return the next key in the trie i.e. the minimum key that is strictly superior to `key` in
/// lexicographic order.
pub fn next_storage_key(&self, key: &[u8]) -> Result<Option<Vec<u8>>, String> {
self.next_storage_key_from_root(&self.root, key)
self.next_storage_key_from_root(&self.root, None, key)
}
/// Return the next key in the child trie i.e. the minimum key that is strictly superior to
@@ -75,6 +76,7 @@ impl<S: TrieBackendStorage<H>, H: Hasher> TrieBackendEssence<S, H> where H::Out:
pub fn next_child_storage_key(
&self,
storage_key: &[u8],
child_info: ChildInfo,
key: &[u8],
) -> Result<Option<Vec<u8>>, String> {
let child_root = match self.storage(storage_key)? {
@@ -90,13 +92,14 @@ impl<S: TrieBackendStorage<H>, H: Hasher> TrieBackendEssence<S, H> where H::Out:
// note: child_root and hash must be same size, panics otherwise.
hash.as_mut().copy_from_slice(&child_root[..]);
self.next_storage_key_from_root(&hash, key)
self.next_storage_key_from_root(&hash, Some(child_info), key)
}
/// Return next key from main trie or child trie by providing corresponding root.
fn next_storage_key_from_root(
&self,
root: &H::Out,
child_info: Option<ChildInfo>,
key: &[u8],
) -> Result<Option<Vec<u8>>, String> {
let mut read_overlay = S::Overlay::default();
@@ -104,8 +107,16 @@ impl<S: TrieBackendStorage<H>, H: Hasher> TrieBackendEssence<S, H> where H::Out:
storage: &self.storage,
overlay: &mut read_overlay,
};
let dyn_eph: &dyn hash_db::HashDBRef<_, _>;
let keyspace_eph;
if let Some(child_info) = child_info.as_ref() {
keyspace_eph = KeySpacedDB::new(&eph, child_info.keyspace());
dyn_eph = &keyspace_eph;
} else {
dyn_eph = &eph;
}
let trie = TrieDB::<H>::new(&eph, root)
let trie = TrieDB::<H>::new(dyn_eph, root)
.map_err(|e| format!("TrieDB creation error: {}", e))?;
let mut iter = trie.iter()
.map_err(|e| format!("TrieDB iteration error: {}", e))?;
@@ -148,7 +159,12 @@ impl<S: TrieBackendStorage<H>, H: Hasher> TrieBackendEssence<S, H> where H::Out:
}
/// Get the value of child storage at given key.
pub fn child_storage(&self, storage_key: &[u8], key: &[u8]) -> Result<Option<Vec<u8>>, String> {
pub fn child_storage(
&self,
storage_key: &[u8],
child_info: ChildInfo,
key: &[u8],
) -> Result<Option<Vec<u8>>, String> {
let root = self.storage(storage_key)?
.unwrap_or(default_child_trie_root::<Layout<H>>(storage_key).encode());
@@ -160,11 +176,17 @@ impl<S: TrieBackendStorage<H>, H: Hasher> TrieBackendEssence<S, H> where H::Out:
let map_e = |e| format!("Trie lookup error: {}", e);
read_child_trie_value::<Layout<H>, _>(storage_key, &eph, &root, key).map_err(map_e)
read_child_trie_value::<Layout<H>, _>(storage_key, child_info.keyspace(), &eph, &root, key)
.map_err(map_e)
}
/// Retrieve all entries keys of child storage and call `f` for each of those keys.
pub fn for_keys_in_child_storage<F: FnMut(&[u8])>(&self, storage_key: &[u8], f: F) {
pub fn for_keys_in_child_storage<F: FnMut(&[u8])>(
&self,
storage_key: &[u8],
child_info: ChildInfo,
f: F,
) {
let root = match self.storage(storage_key) {
Ok(v) => v.unwrap_or(default_child_trie_root::<Layout<H>>(storage_key).encode()),
Err(e) => {
@@ -181,6 +203,7 @@ impl<S: TrieBackendStorage<H>, H: Hasher> TrieBackendEssence<S, H> where H::Out:
if let Err(e) = for_keys_in_child_trie::<Layout<H>, _, Ephemeral<S, H>>(
storage_key,
child_info.keyspace(),
&eph,
&root,
f,
@@ -193,6 +216,7 @@ impl<S: TrieBackendStorage<H>, H: Hasher> TrieBackendEssence<S, H> where H::Out:
pub fn for_child_keys_with_prefix<F: FnMut(&[u8])>(
&self,
storage_key: &[u8],
child_info: ChildInfo,
prefix: &[u8],
mut f: F,
) {
@@ -205,13 +229,12 @@ impl<S: TrieBackendStorage<H>, H: Hasher> TrieBackendEssence<S, H> where H::Out:
};
let mut root = H::Out::default();
root.as_mut().copy_from_slice(&root_vec);
self.keys_values_with_prefix_inner(&root, prefix, |k, _v| f(k))
self.keys_values_with_prefix_inner(&root, prefix, |k, _v| f(k), Some(child_info))
}
/// Execute given closure for all keys starting with prefix.
pub fn for_keys_with_prefix<F: FnMut(&[u8])>(&self, prefix: &[u8], mut f: F) {
self.keys_values_with_prefix_inner(&self.root, prefix, |k, _v| f(k))
self.keys_values_with_prefix_inner(&self.root, prefix, |k, _v| f(k), None)
}
@@ -220,15 +243,16 @@ impl<S: TrieBackendStorage<H>, H: Hasher> TrieBackendEssence<S, H> where H::Out:
root: &H::Out,
prefix: &[u8],
mut f: F,
child_info: Option<ChildInfo>,
) {
let mut read_overlay = S::Overlay::default();
let eph = Ephemeral {
storage: &self.storage,
overlay: &mut read_overlay,
};
let mut iter = move || -> Result<(), Box<TrieError<H::Out>>> {
let trie = TrieDB::<H>::new(&eph, root)?;
let mut iter = move |db| -> Result<(), Box<TrieError<H::Out>>> {
let trie = TrieDB::<H>::new(db, root)?;
let mut iter = trie.iter()?;
iter.seek(prefix)?;
@@ -246,14 +270,20 @@ impl<S: TrieBackendStorage<H>, H: Hasher> TrieBackendEssence<S, H> where H::Out:
Ok(())
};
if let Err(e) = iter() {
let result = if let Some(child_info) = child_info {
let db = KeySpacedDB::new(&eph, child_info.keyspace());
iter(&db)
} else {
iter(&eph)
};
if let Err(e) = result {
debug!(target: "trie", "Error while iterating by prefix: {}", e);
}
}
/// Execute given closure for all key and values starting with prefix.
pub fn for_key_values_with_prefix<F: FnMut(&[u8], &[u8])>(&self, prefix: &[u8], f: F) {
self.keys_values_with_prefix_inner(&self.root, prefix, f)
self.keys_values_with_prefix_inner(&self.root, prefix, f, None)
}
}
@@ -419,11 +449,12 @@ impl<H: Hasher> TrieBackendStorage<H> for MemoryDB<H> {
#[cfg(test)]
mod test {
use primitives::{Blake2Hasher, H256};
use trie::{TrieMut, PrefixedMemoryDB, trie_types::TrieDBMut};
use trie::{TrieMut, PrefixedMemoryDB, trie_types::TrieDBMut, KeySpacedDBMut};
use super::*;
#[test]
fn next_storage_key_and_next_child_storage_key_work() {
let child_info = ChildInfo::new_default(b"uniqueid");
// Contains values
let mut root_1 = H256::default();
// Contains child trie
@@ -436,6 +467,15 @@ mod test {
trie.insert(b"4", &[1]).expect("insert failed");
trie.insert(b"6", &[1]).expect("insert failed");
}
{
let mut mdb = KeySpacedDBMut::new(&mut mdb, child_info.keyspace());
// reuse of root_1 implicitly assert child trie root is same
// as top trie (contents must remain the same).
let mut trie = TrieDBMut::new(&mut mdb, &mut root_1);
trie.insert(b"3", &[1]).expect("insert failed");
trie.insert(b"4", &[1]).expect("insert failed");
trie.insert(b"6", &[1]).expect("insert failed");
}
{
let mut trie = TrieDBMut::new(&mut mdb, &mut root_2);
trie.insert(b"MyChild", root_1.as_ref()).expect("insert failed");
@@ -452,10 +492,20 @@ mod test {
let mdb = essence_1.into_storage();
let essence_2 = TrieBackendEssence::new(mdb, root_2);
assert_eq!(essence_2.next_child_storage_key(b"MyChild", b"2"), Ok(Some(b"3".to_vec())));
assert_eq!(essence_2.next_child_storage_key(b"MyChild", b"3"), Ok(Some(b"4".to_vec())));
assert_eq!(essence_2.next_child_storage_key(b"MyChild", b"4"), Ok(Some(b"6".to_vec())));
assert_eq!(essence_2.next_child_storage_key(b"MyChild", b"5"), Ok(Some(b"6".to_vec())));
assert_eq!(essence_2.next_child_storage_key(b"MyChild", b"6"), Ok(None));
assert_eq!(
essence_2.next_child_storage_key(b"MyChild", child_info, b"2"), Ok(Some(b"3".to_vec()))
);
assert_eq!(
essence_2.next_child_storage_key(b"MyChild", child_info, b"3"), Ok(Some(b"4".to_vec()))
);
assert_eq!(
essence_2.next_child_storage_key(b"MyChild", child_info, b"4"), Ok(Some(b"6".to_vec()))
);
assert_eq!(
essence_2.next_child_storage_key(b"MyChild", child_info, b"5"), Ok(Some(b"6".to_vec()))
);
assert_eq!(
essence_2.next_child_storage_key(b"MyChild", child_info, b"6"), Ok(None)
);
}
}