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last output in a block is the last regular output, failing that the last coinbase output (#727)

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apply_block() processes regular outputs last so we need to be consistent with this
This commit is contained in:
Antioch Peverell 2018-02-24 14:40:23 -05:00 committed by Ignotus Peverell
parent bc9a1cfeed
commit 29044b5a32
1 changed files with 33 additions and 4 deletions
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33
chain/src/sumtree.rs
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@ -687,9 +687,38 @@ where
file_store.rewind(leaf_index - 1) file_store.rewind(leaf_index - 1)
}*/ }*/
/// Output and kernel MMR indexes at the end of the provided block /// Output and kernel MMR indexes at the end of the provided block.
/// This requires us to know the "last" output processed in the block
/// and needs to be consistent with how we originally processed
/// the outputs in apply_block()
fn indexes_at(block: &Block, commit_index: &ChainStore) -> Result<(u64, u64), Error> { fn indexes_at(block: &Block, commit_index: &ChainStore) -> Result<(u64, u64), Error> {
let out_idx = match block.outputs.last() { // If we have any regular outputs then the "last" output is the last regular output
// otherwise it is the last coinbase output.
// This is because we process coinbase outputs before regular outputs in apply_block().
//
// TODO - consider maintaining coinbase outputs in a separate vec in a block?
//
let mut last_coinbase_output: Option<Output> = None;
let mut last_regular_output: Option<Output> = None;
for x in &block.outputs {
if x.features.contains(OutputFeatures::COINBASE_OUTPUT) {
last_coinbase_output = Some(*x);
} else {
last_regular_output = Some(*x);
}
}
// use last regular output if we have any, otherwise last coinbase output
let last_output = if last_regular_output.is_some() {
last_regular_output
} else if last_coinbase_output.is_some() {
last_coinbase_output
} else {
None
};
let out_idx = match last_output {
Some(output) => commit_index.get_output_pos(&output.commitment()) Some(output) => commit_index.get_output_pos(&output.commitment())
.map_err(|e| { .map_err(|e| {
Error::StoreErr(e, format!("missing output pos for known block")) Error::StoreErr(e, format!("missing output pos for known block"))