refactor: Use Arc<Block> in BlockVerifier
Arc is a bit more flexible when using futures. And improve the documentation for coinbase_is_first_check. Closes #627.
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@ -53,8 +53,15 @@ pub(crate) fn node_time_check(
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}
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}
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/// Check that there is exactly one coinbase transaction in `Block`, and that
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/// the coinbase transaction is the first transaction in the block.
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///
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/// "The first (and only the first) transaction in a block is a coinbase
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/// transaction, which collects and spends any miner subsidy and transaction
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/// fees paid by transactions included in this block."[S 3.10][3.10]
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///
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/// [3.10]: https://zips.z.cash/protocol/protocol.pdf#coinbasetransactions
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pub(crate) fn coinbase_check(block: &Block) -> Result<(), Error> {
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pub(crate) fn coinbase_is_first_check(block: Arc<Block>) -> Result<(), Error> {
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if block.coinbase_height().is_some() {
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// No coinbase inputs in additional transactions allowed
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if block
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@ -116,7 +123,7 @@ where
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let now = Utc::now();
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node_time_check(block.header.time, now)?;
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block.header.is_equihash_solution_valid()?;
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coinbase_check(block.as_ref())?;
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coinbase_is_first_check(block.clone())?;
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// `Tower::Buffer` requires a 1:1 relationship between `poll()`s
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// and `call()`s, because it reserves a buffer slot in each
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