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First few tests working.

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This commit is contained in:
Gav Wood 2015-12-01 03:35:55 +01:00
parent 87e458efed
commit 4e4b754eca
2 changed files with 80 additions and 46 deletions
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9
src/rlp.rs
View File

@ -174,7 +174,7 @@ impl<'a, 'view> Rlp<'a> where 'a: 'view {
self.rlp.data()
}
/// Returns number of rlp items.
/// Returns number of RLP items.
///
/// ```rust
/// extern crate ethcore_util as util;
@ -210,7 +210,7 @@ impl<'a, 'view> Rlp<'a> where 'a: 'view {
self.rlp.size()
}
/// Get view onto rlp-slice at index.
/// Get view onto RLP-slice at index.
///
/// Caches offset to given index, so access to successive
/// slices is faster.
@ -337,7 +337,7 @@ impl<'a, 'view> UntrustedRlp<'a> where 'a: 'view {
}
}
/// The bare data of the rlp.
/// The bare data of the RLP.
///
/// ```rust
/// extern crate ethcore_util as util;
@ -355,7 +355,8 @@ impl<'a, 'view> UntrustedRlp<'a> where 'a: 'view {
}
pub fn data(&'view self) -> &'a [u8] {
unimplemented!();
let ii = Self::item_info(self.bytes).unwrap();
&self.bytes[ii.prefix_len..(ii.prefix_len + ii.value_len)]
}
/// Returns number of rlp items.

105
src/trie.rs
View File

@ -101,7 +101,7 @@ impl TrieDB {
fn add(&mut self, key: &NibbleSlice, value: &[u8]) {
// determine what the new root is, insert new nodes and remove old as necessary.
let mut todo: Diff = Diff::new();
let root_rlp = self.inject(self.db.lookup(&self.root).expect("Trie root not found!"), key, value, &mut todo);
let root_rlp = self.augmented(self.db.lookup(&self.root).expect("Trie root not found!"), key, value, &mut todo);
self.apply(todo);
self.set_root_rlp(&root_rlp);
}
@ -134,11 +134,13 @@ impl TrieDB {
/// the trie.
fn take_node<'a, 'rlp_view>(&'a self, rlp: &'rlp_view Rlp<'a>, diff: &mut Diff) -> &'a [u8] where 'a: 'rlp_view {
if rlp.is_list() {
trace!("take_node {:?} (inline)", rlp.raw());
rlp.raw()
}
else if rlp.is_data() && rlp.size() == 32 {
let h = H256::decode(rlp);
let r = self.db.lookup(&h).expect("Trie root not found!");
trace!("take_node {:?} (indirect for {:?})", rlp.raw(), r);
diff.delete_node_sha3(h);
r
}
@ -150,7 +152,8 @@ impl TrieDB {
/// Transform an existing extension or leaf node to an invalid single-entry branch.
///
/// **This operation will not insert the new node nor destroy the original.**
fn transmute_extension_to_branch(orig_partial: &NibbleSlice, orig_raw_payload: &[u8], diff: &mut Diff) -> Bytes {
fn transmuted_extension_to_branch(orig_partial: &NibbleSlice, orig_raw_payload: &[u8], diff: &mut Diff) -> Bytes {
trace!("transmuted_extension_to_branch");
let mut s = RlpStream::new_list(17);
assert!(!orig_partial.is_empty()); // extension nodes are not allowed to have empty partial keys.
let index = orig_partial.at(0);
@ -171,7 +174,8 @@ impl TrieDB {
s.out()
}
fn transmute_leaf_to_branch(orig_partial: &NibbleSlice, orig_raw_payload: &[u8], diff: &mut Diff) -> Bytes {
fn transmuted_leaf_to_branch(orig_partial: &NibbleSlice, orig_raw_payload: &[u8], diff: &mut Diff) -> Bytes {
trace!("transmuted_leaf_to_branch");
let mut s = RlpStream::new_list(17);
let index = if orig_partial.is_empty() {16} else {orig_partial.at(0)};
// orig is leaf - orig_raw_payload is data representing the actual value.
@ -189,24 +193,26 @@ impl TrieDB {
/// Transform an existing extension or leaf node plus a new partial/value to a two-entry branch.
///
/// **This operation will not insert the new node nor destroy the original.**
fn transmute_to_branch_and_inject(&self, orig_is_leaf: bool, orig_partial: &NibbleSlice, orig_raw_payload: &[u8], partial: &NibbleSlice, value: &[u8], diff: &mut Diff) -> Bytes {
fn transmuted_to_branch_and_augmented(&self, orig_is_leaf: bool, orig_partial: &NibbleSlice, orig_raw_payload: &[u8], partial: &NibbleSlice, value: &[u8], diff: &mut Diff) -> Bytes {
trace!("transmuted_to_branch_and_augmented");
let intermediate = match orig_is_leaf {
true => Self::transmute_leaf_to_branch(orig_partial, orig_raw_payload, diff),
false => Self::transmute_extension_to_branch(orig_partial, orig_raw_payload, diff),
true => Self::transmuted_leaf_to_branch(orig_partial, orig_raw_payload, diff),
false => Self::transmuted_extension_to_branch(orig_partial, orig_raw_payload, diff),
};
self.inject(&intermediate, partial, value, diff)
self.augmented(&intermediate, partial, value, diff)
// TODO: implement without having to make an intermediate representation.
}
/// Given a branch node's RLP `orig` together with a `partial` key and `value`, return the
/// RLP-encoded node that accomodates the trie with the new entry. Mutate `diff` so that
/// once applied the returned node is valid.
fn injected_into_branch(&self, orig: &Rlp, partial: &NibbleSlice, value: &[u8], diff: &mut Diff) -> Bytes {
fn augmented_into_branch(&self, orig: &Rlp, partial: &NibbleSlice, value: &[u8], diff: &mut Diff) -> Bytes {
trace!("augmented_into_branch");
let mut s = RlpStream::new_list(17);
let index = if partial.is_empty() {16} else {partial.at(0) as usize};
for i in 0usize..17 {
if index == i {
// this is node to inject into...
// this is node to augment into...
if orig.at(i).is_empty() {
// easy - original had empty slot.
diff.new_node(Self::compose_leaf(&partial.mid(if i == 16 {0} else {1}), value), &mut s);
@ -216,7 +222,7 @@ impl TrieDB {
diff.replace_node(&orig.at(i), new, &mut s);
} else {
// harder - original has something there already
let new = self.inject(orig.at(i).raw(), &partial.mid(1), value, diff);
let new = self.augmented(orig.at(i).raw(), &partial.mid(1), value, diff);
diff.replace_node(&orig.at(i), new, &mut s);
}
} else {
@ -226,8 +232,6 @@ impl TrieDB {
s.out()
}
/// Determine the RLP of the node, assuming we're inserting `partial` into the
/// node currently of data `old`. This will *not* delete any hash of `old` from the database;
/// it will just return the new RLP that includes the new node.
@ -236,31 +240,35 @@ impl TrieDB {
/// and deleting nodes as necessary.
///
/// **This operation will not insert the new node now destroy the original.**
fn inject(&self, old: &[u8], partial: &NibbleSlice, value: &[u8], diff: &mut Diff) -> Bytes {
fn augmented(&self, old: &[u8], partial: &NibbleSlice, value: &[u8], diff: &mut Diff) -> Bytes {
trace!("augmented ({:?}, {:?}, {:?})", old, partial, value);
// already have an extension. either fast_forward, cleve or transmute_to_branch.
let old_rlp = Rlp::new(old);
match old_rlp.prototype() {
Prototype::List(17) => {
// already have a branch. route and inject.
self.injected_into_branch(&old_rlp, partial, value, diff)
// already have a branch. route and augment.
self.augmented_into_branch(&old_rlp, partial, value, diff)
},
Prototype::List(2) => {
let their_key_rlp = old_rlp.at(0);
let (them, is_leaf) = NibbleSlice::from_encoded(their_key_rlp.data());
match partial.common_prefix(&them) {
0 if partial.is_empty() && them.is_empty() => {
// both empty: just replace.
let existing_key_rlp = old_rlp.at(0);
let (existing_key, is_leaf) = NibbleSlice::from_encoded(existing_key_rlp.data());
match partial.common_prefix(&existing_key) {
cp if partial.len() == existing_key.len() && cp == existing_key.len() && is_leaf => {
// equivalent-leaf: replace
trace!("equivalent-leaf: REPLACE");
Self::compose_leaf(partial, value)
},
0 => {
// one of us isn't empty: transmute to branch here
self.transmute_to_branch_and_inject(is_leaf, &them, old_rlp.at(1).raw(), partial, value, diff)
trace!("no-common-prefix, not-both-empty (exist={:?}; new={:?}): TRANSMUTE,AUGMENT", existing_key.len(), partial.len());
self.transmuted_to_branch_and_augmented(is_leaf, &existing_key, old_rlp.at(1).raw(), partial, value, diff)
},
cp if cp == them.len() => {
cp if cp == existing_key.len() => {
trace!("complete-prefix (cp={:?}): AUGMENT-AT-END", cp);
// fully-shared prefix for this extension:
// skip to the end of this extension and continue the inject there.
// skip to the end of this extension and continue to augment there.
let n = self.take_node(&old_rlp.at(1), diff);
let downstream_node = self.inject(n, &partial.mid(cp), value, diff);
let downstream_node = self.augmented(n, &partial.mid(cp), value, diff);
let mut s = RlpStream::new_list(2);
s.append_raw(old_rlp.at(0).raw(), 1);
diff.new_node(downstream_node, &mut s);
@ -269,19 +277,21 @@ impl TrieDB {
cp => {
// partially-shared prefix for this extension:
// split into two extensions, high and low, pass the
// low through inject with the value before inserting the result
// low through augment with the value before inserting the result
// into high to create the new.
// TODO: optimise by doing this without creating injected_low.
// TODO: optimise by doing this without creating augmented_low.
trace!("partially-shared-prefix (exist={:?}; new={:?}; cp={:?}): AUGMENT-AT-END", existing_key.len(), partial.len(), cp);
// low (farther from root)
let low = Self::compose_raw(&them.mid(cp), old_rlp.at(1).raw(), is_leaf);
let injected_low = self.inject(&low, &partial.mid(cp), value, diff);
let low = Self::compose_raw(&existing_key.mid(cp), old_rlp.at(1).raw(), is_leaf);
let augmented_low = self.augmented(&low, &partial.mid(cp), value, diff);
// high (closer to root)
let mut s = RlpStream::new_list(2);
s.append(&them.encoded_leftmost(cp, false));
diff.new_node(injected_low, &mut s);
s.append(&existing_key.encoded_leftmost(cp, false));
diff.new_node(augmented_low, &mut s);
s.out()
},
}
@ -314,21 +324,44 @@ impl Trie for TrieDB {
}
}
#[test]
fn playpen() {
use overlaydb::*;
#[cfg(test)]
mod tests {
use memorydb::*;
use triehash::*;
use super::*;
use env_logger;
#[test]
fn playpen() {
env_logger::init().unwrap();
(&[1, 2, 3]).starts_with(&[1, 2]);
let mut t = TrieDB::new(MemoryDB::new());
t.init();
t.insert(&[0x01u8, 0x23], &[0x01u8, 0x23]);
}
let mut t = TrieDB::new(OverlayDB::new_temp());
#[test]
fn init() {
let mut t = TrieDB::new(MemoryDB::new());
t.init();
assert_eq!(*t.root(), SHA3_NULL_RLP);
assert!(t.is_empty());
}
#[test]
fn insert_on_empty() {
let mut t = TrieDB::new(MemoryDB::new());
t.init();
t.insert(&[0x01u8, 0x23], &[0x01u8, 0x23]);
assert_eq!(*t.root(), trie_root(vec![ (vec![1u8, 0x23], vec![1u8, 0x23]) ]));
assert_eq!(*t.root(), trie_root(vec![ (vec![0x01u8, 0x23], vec![0x01u8, 0x23]) ]));
}
#[test]
fn insert_replace_root() {
let mut t = TrieDB::new(MemoryDB::new());
t.init();
t.insert(&[0x01u8, 0x23], &[0x01u8, 0x23]);
t.insert(&[0x01u8, 0x23], &[0x23u8, 0x45]);
assert_eq!(*t.root(), trie_root(vec![ (vec![0x01u8, 0x23], vec![0x23u8, 0x45]) ]));
}
}