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Merge pull request #5479 from paritytech/fix-tree-route-panic

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fix panickers in tree-route
This commit is contained in:
Robert Habermeier 2017-04-20 18:31:16 +02:00 committed by GitHub
commit f18f81ec58
2 changed files with 29 additions and 21 deletions
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48
ethcore/src/blockchain/blockchain.rs
View File

@ -650,12 +650,19 @@ impl BlockChain {
/// ```json
/// { blocks: [B4, B3, A3, A4], ancestor: A2, index: 2 }
/// ```
pub fn tree_route(&self, from: H256, to: H256) -> TreeRoute {
///
/// If the tree route verges into pruned or unknown blocks,
/// `None` is returned.
pub fn tree_route(&self, from: H256, to: H256) -> Option<TreeRoute> {
macro_rules! otry {
($e:expr) => { match $e { Some(x) => x, None => return None } }
}
let mut from_branch = vec![];
let mut to_branch = vec![];
let mut from_details = self.block_details(&from).unwrap_or_else(|| panic!("0. Expected to find details for block {:?}", from));
let mut to_details = self.block_details(&to).unwrap_or_else(|| panic!("1. Expected to find details for block {:?}", to));
let mut from_details = otry!(self.block_details(&from));
let mut to_details = otry!(self.block_details(&to));
let mut current_from = from;
let mut current_to = to;
@ -663,13 +670,13 @@ impl BlockChain {
while from_details.number > to_details.number {
from_branch.push(current_from);
current_from = from_details.parent.clone();
from_details = self.block_details(&from_details.parent).unwrap_or_else(|| panic!("2. Expected to find details for block {:?}", from_details.parent));
from_details = otry!(self.block_details(&from_details.parent));
}
while to_details.number > from_details.number {
to_branch.push(current_to);
current_to = to_details.parent.clone();
to_details = self.block_details(&to_details.parent).unwrap_or_else(|| panic!("3. Expected to find details for block {:?}", to_details.parent));
to_details = otry!(self.block_details(&to_details.parent));
}
assert_eq!(from_details.number, to_details.number);
@ -678,22 +685,22 @@ impl BlockChain {
while current_from != current_to {
from_branch.push(current_from);
current_from = from_details.parent.clone();
from_details = self.block_details(&from_details.parent).unwrap_or_else(|| panic!("4. Expected to find details for block {:?}", from_details.parent));
from_details = otry!(self.block_details(&from_details.parent));
to_branch.push(current_to);
current_to = to_details.parent.clone();
to_details = self.block_details(&to_details.parent).unwrap_or_else(|| panic!("5. Expected to find details for block {:?}", from_details.parent));
to_details = otry!(self.block_details(&to_details.parent));
}
let index = from_branch.len();
from_branch.extend(to_branch.into_iter().rev());
TreeRoute {
Some(TreeRoute {
blocks: from_branch,
ancestor: current_from,
index: index
}
})
}
/// Inserts a verified, known block from the canonical chain.
@ -879,7 +886,8 @@ impl BlockChain {
// are moved to "canon chain"
// find the route between old best block and the new one
let best_hash = self.best_block_hash();
let route = self.tree_route(best_hash, parent_hash);
let route = self.tree_route(best_hash, parent_hash)
.expect("blocks being imported always within recent history; qed");
assert_eq!(number, parent_details.number + 1);
@ -1711,52 +1719,52 @@ mod tests {
assert_eq!(bc.block_hash(3).unwrap(), b3a_hash);
// test trie route
let r0_1 = bc.tree_route(genesis_hash.clone(), b1_hash.clone());
let r0_1 = bc.tree_route(genesis_hash.clone(), b1_hash.clone()).unwrap();
assert_eq!(r0_1.ancestor, genesis_hash);
assert_eq!(r0_1.blocks, [b1_hash.clone()]);
assert_eq!(r0_1.index, 0);
let r0_2 = bc.tree_route(genesis_hash.clone(), b2_hash.clone());
let r0_2 = bc.tree_route(genesis_hash.clone(), b2_hash.clone()).unwrap();
assert_eq!(r0_2.ancestor, genesis_hash);
assert_eq!(r0_2.blocks, [b1_hash.clone(), b2_hash.clone()]);
assert_eq!(r0_2.index, 0);
let r1_3a = bc.tree_route(b1_hash.clone(), b3a_hash.clone());
let r1_3a = bc.tree_route(b1_hash.clone(), b3a_hash.clone()).unwrap();
assert_eq!(r1_3a.ancestor, b1_hash);
assert_eq!(r1_3a.blocks, [b2_hash.clone(), b3a_hash.clone()]);
assert_eq!(r1_3a.index, 0);
let r1_3b = bc.tree_route(b1_hash.clone(), b3b_hash.clone());
let r1_3b = bc.tree_route(b1_hash.clone(), b3b_hash.clone()).unwrap();
assert_eq!(r1_3b.ancestor, b1_hash);
assert_eq!(r1_3b.blocks, [b2_hash.clone(), b3b_hash.clone()]);
assert_eq!(r1_3b.index, 0);
let r3a_3b = bc.tree_route(b3a_hash.clone(), b3b_hash.clone());
let r3a_3b = bc.tree_route(b3a_hash.clone(), b3b_hash.clone()).unwrap();
assert_eq!(r3a_3b.ancestor, b2_hash);
assert_eq!(r3a_3b.blocks, [b3a_hash.clone(), b3b_hash.clone()]);
assert_eq!(r3a_3b.index, 1);
let r1_0 = bc.tree_route(b1_hash.clone(), genesis_hash.clone());
let r1_0 = bc.tree_route(b1_hash.clone(), genesis_hash.clone()).unwrap();
assert_eq!(r1_0.ancestor, genesis_hash);
assert_eq!(r1_0.blocks, [b1_hash.clone()]);
assert_eq!(r1_0.index, 1);
let r2_0 = bc.tree_route(b2_hash.clone(), genesis_hash.clone());
let r2_0 = bc.tree_route(b2_hash.clone(), genesis_hash.clone()).unwrap();
assert_eq!(r2_0.ancestor, genesis_hash);
assert_eq!(r2_0.blocks, [b2_hash.clone(), b1_hash.clone()]);
assert_eq!(r2_0.index, 2);
let r3a_1 = bc.tree_route(b3a_hash.clone(), b1_hash.clone());
let r3a_1 = bc.tree_route(b3a_hash.clone(), b1_hash.clone()).unwrap();
assert_eq!(r3a_1.ancestor, b1_hash);
assert_eq!(r3a_1.blocks, [b3a_hash.clone(), b2_hash.clone()]);
assert_eq!(r3a_1.index, 2);
let r3b_1 = bc.tree_route(b3b_hash.clone(), b1_hash.clone());
let r3b_1 = bc.tree_route(b3b_hash.clone(), b1_hash.clone()).unwrap();
assert_eq!(r3b_1.ancestor, b1_hash);
assert_eq!(r3b_1.blocks, [b3b_hash.clone(), b2_hash.clone()]);
assert_eq!(r3b_1.index, 2);
let r3b_3a = bc.tree_route(b3b_hash.clone(), b3a_hash.clone());
let r3b_3a = bc.tree_route(b3b_hash.clone(), b3a_hash.clone()).unwrap();
assert_eq!(r3b_3a.ancestor, b2_hash);
assert_eq!(r3b_3a.blocks, [b3b_hash.clone(), b3a_hash.clone()]);
assert_eq!(r3b_3a.index, 1);

2
ethcore/src/client/client.rs
View File

@ -1270,7 +1270,7 @@ impl BlockChainClient for Client {
fn tree_route(&self, from: &H256, to: &H256) -> Option<TreeRoute> {
let chain = self.chain.read();
match chain.is_known(from) && chain.is_known(to) {
true => Some(chain.tree_route(from.clone(), to.clone())),
true => chain.tree_route(from.clone(), to.clone()),
false => None
}
}