diff --git a/bitcoin/src/merkle_tree/block.rs b/bitcoin/src/merkle_tree/block.rs index 8b9727c7..b08be4da 100644 --- a/bitcoin/src/merkle_tree/block.rs +++ b/bitcoin/src/merkle_tree/block.rs @@ -48,45 +48,115 @@ use crate::consensus::encode::{self, Decodable, Encodable}; use crate::hash_types::{TxMerkleNode, Txid}; use crate::hashes::Hash; use crate::io; -use crate::merkle_tree::MerkleBlockError::*; use crate::prelude::*; +use self::MerkleBlockError::*; -/// An error when verifying the merkle block. -#[derive(Clone, PartialEq, Eq, Debug)] -#[non_exhaustive] -pub enum MerkleBlockError { - /// Merkle root in the header doesn't match to the root calculated from partial merkle tree. - MerkleRootMismatch, - /// Partial merkle tree contains no transactions. - NoTransactions, - /// There are too many transactions. - TooManyTransactions, - /// General format error. - BadFormat(String), +/// Data structure that represents a block header paired to a partial merkle tree. +/// +/// NOTE: This assumes that the given Block has *at least* 1 transaction. If the Block has 0 txs, +/// it will hit an assertion. +#[derive(PartialEq, Eq, Clone, Debug)] +pub struct MerkleBlock { + /// The block header + pub header: block::Header, + /// Transactions making up a partial merkle tree + pub txn: PartialMerkleTree, } -impl fmt::Display for MerkleBlockError { - fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { - use self::MerkleBlockError::*; +impl MerkleBlock { + /// Create a MerkleBlock from a block, that contains proofs for specific txids. + /// + /// The `block` is a full block containing the header and transactions and `match_txids` is a + /// function that returns true for the ids that should be included in the partial merkle tree. + /// + /// # Examples + /// + /// ```rust + /// use bitcoin::hash_types::Txid; + /// use bitcoin::hashes::hex::FromHex; + /// use bitcoin::{Block, MerkleBlock}; + /// + /// // Block 80000 + /// let block_bytes = Vec::from_hex("01000000ba8b9cda965dd8e536670f9ddec10e53aab14b20bacad2\ + /// 7b9137190000000000190760b278fe7b8565fda3b968b918d5fd997f993b23674c0af3b6fde300b38f33\ + /// a5914ce6ed5b1b01e32f5702010000000100000000000000000000000000000000000000000000000000\ + /// 00000000000000ffffffff0704e6ed5b1b014effffffff0100f2052a01000000434104b68a50eaa0287e\ + /// ff855189f949c1c6e5f58b37c88231373d8a59809cbae83059cc6469d65c665ccfd1cfeb75c6e8e19413\ + /// bba7fbff9bc762419a76d87b16086eac000000000100000001a6b97044d03da79c005b20ea9c0e1a6d9d\ + /// c12d9f7b91a5911c9030a439eed8f5000000004948304502206e21798a42fae0e854281abd38bacd1aee\ + /// d3ee3738d9e1446618c4571d1090db022100e2ac980643b0b82c0e88ffdfec6b64e3e6ba35e7ba5fdd7d\ + /// 5d6cc8d25c6b241501ffffffff0100f2052a010000001976a914404371705fa9bd789a2fcd52d2c580b6\ + /// 5d35549d88ac00000000").unwrap(); + /// let block: Block = bitcoin::consensus::deserialize(&block_bytes).unwrap(); + /// + /// // Create a merkle block containing a single transaction + /// let txid = "5a4ebf66822b0b2d56bd9dc64ece0bc38ee7844a23ff1d7320a88c5fdb2ad3e2".parse::().unwrap(); + /// let match_txids: Vec = vec![txid].into_iter().collect(); + /// let mb = MerkleBlock::from_block_with_predicate(&block, |t| match_txids.contains(t)); + /// + /// // Authenticate and extract matched transaction ids + /// let mut matches: Vec = vec![]; + /// let mut index: Vec = vec![]; + /// assert!(mb.extract_matches(&mut matches, &mut index).is_ok()); + /// assert_eq!(txid, matches[0]); + /// ``` + pub fn from_block_with_predicate(block: &Block, match_txids: F) -> Self + where + F: Fn(&Txid) -> bool, + { + let block_txids: Vec<_> = block.txdata.iter().map(Transaction::txid).collect(); + Self::from_header_txids_with_predicate(&block.header, &block_txids, match_txids) + } - match *self { - MerkleRootMismatch => write!(f, "merkle header root doesn't match to the root calculated from the partial merkle tree"), - NoTransactions => write!(f, "partial merkle tree contains no transactions"), - TooManyTransactions => write!(f, "too many transactions"), - BadFormat(ref s) => write!(f, "general format error: {}", s), + /// Create a MerkleBlock from the block's header and txids, that contain proofs for specific txids. + /// + /// The `header` is the block header, `block_txids` is the full list of txids included in the block and + /// `match_txids` is a function that returns true for the ids that should be included in the partial merkle tree. + pub fn from_header_txids_with_predicate( + header: &block::Header, + block_txids: &[Txid], + match_txids: F, + ) -> Self + where + F: Fn(&Txid) -> bool, + { + let matches: Vec = block_txids.iter().map(match_txids).collect(); + + let pmt = PartialMerkleTree::from_txids(block_txids, &matches); + MerkleBlock { header: *header, txn: pmt } + } + + /// Extract the matching txid's represented by this partial merkle tree + /// and their respective indices within the partial tree. + /// returns Ok(()) on success, or error in case of failure + pub fn extract_matches( + &self, + matches: &mut Vec, + indexes: &mut Vec, + ) -> Result<(), MerkleBlockError> { + let merkle_root = self.txn.extract_matches(matches, indexes)?; + + if merkle_root.eq(&self.header.merkle_root) { + Ok(()) + } else { + Err(MerkleRootMismatch) } } } -#[cfg(feature = "std")] -#[cfg_attr(docsrs, doc(cfg(feature = "std")))] -impl std::error::Error for MerkleBlockError { - fn source(&self) -> Option<&(dyn std::error::Error + 'static)> { - use self::MerkleBlockError::*; +impl Encodable for MerkleBlock { + fn consensus_encode(&self, w: &mut W) -> Result { + let len = self.header.consensus_encode(w)? + self.txn.consensus_encode(w)?; + Ok(len) + } +} - match *self { - MerkleRootMismatch | NoTransactions | TooManyTransactions | BadFormat(_) => None, - } +impl Decodable for MerkleBlock { + fn consensus_decode(r: &mut R) -> Result { + Ok(MerkleBlock { + header: Decodable::consensus_decode(r)?, + txn: Decodable::consensus_decode(r)?, + }) } } @@ -386,112 +456,42 @@ impl Decodable for PartialMerkleTree { } } -/// Data structure that represents a block header paired to a partial merkle tree. -/// -/// NOTE: This assumes that the given Block has *at least* 1 transaction. If the Block has 0 txs, -/// it will hit an assertion. -#[derive(PartialEq, Eq, Clone, Debug)] -pub struct MerkleBlock { - /// The block header - pub header: block::Header, - /// Transactions making up a partial merkle tree - pub txn: PartialMerkleTree, +/// An error when verifying the merkle block. +#[derive(Clone, PartialEq, Eq, Debug)] +#[non_exhaustive] +pub enum MerkleBlockError { + /// Merkle root in the header doesn't match to the root calculated from partial merkle tree. + MerkleRootMismatch, + /// Partial merkle tree contains no transactions. + NoTransactions, + /// There are too many transactions. + TooManyTransactions, + /// General format error. + BadFormat(String), } -impl MerkleBlock { - /// Create a MerkleBlock from a block, that contains proofs for specific txids. - /// - /// The `block` is a full block containing the header and transactions and `match_txids` is a - /// function that returns true for the ids that should be included in the partial merkle tree. - /// - /// # Examples - /// - /// ```rust - /// use bitcoin::hash_types::Txid; - /// use bitcoin::hashes::hex::FromHex; - /// use bitcoin::{Block, MerkleBlock}; - /// - /// // Block 80000 - /// let block_bytes = Vec::from_hex("01000000ba8b9cda965dd8e536670f9ddec10e53aab14b20bacad2\ - /// 7b9137190000000000190760b278fe7b8565fda3b968b918d5fd997f993b23674c0af3b6fde300b38f33\ - /// a5914ce6ed5b1b01e32f5702010000000100000000000000000000000000000000000000000000000000\ - /// 00000000000000ffffffff0704e6ed5b1b014effffffff0100f2052a01000000434104b68a50eaa0287e\ - /// ff855189f949c1c6e5f58b37c88231373d8a59809cbae83059cc6469d65c665ccfd1cfeb75c6e8e19413\ - /// bba7fbff9bc762419a76d87b16086eac000000000100000001a6b97044d03da79c005b20ea9c0e1a6d9d\ - /// c12d9f7b91a5911c9030a439eed8f5000000004948304502206e21798a42fae0e854281abd38bacd1aee\ - /// d3ee3738d9e1446618c4571d1090db022100e2ac980643b0b82c0e88ffdfec6b64e3e6ba35e7ba5fdd7d\ - /// 5d6cc8d25c6b241501ffffffff0100f2052a010000001976a914404371705fa9bd789a2fcd52d2c580b6\ - /// 5d35549d88ac00000000").unwrap(); - /// let block: Block = bitcoin::consensus::deserialize(&block_bytes).unwrap(); - /// - /// // Create a merkle block containing a single transaction - /// let txid = "5a4ebf66822b0b2d56bd9dc64ece0bc38ee7844a23ff1d7320a88c5fdb2ad3e2".parse::().unwrap(); - /// let match_txids: Vec = vec![txid].into_iter().collect(); - /// let mb = MerkleBlock::from_block_with_predicate(&block, |t| match_txids.contains(t)); - /// - /// // Authenticate and extract matched transaction ids - /// let mut matches: Vec = vec![]; - /// let mut index: Vec = vec![]; - /// assert!(mb.extract_matches(&mut matches, &mut index).is_ok()); - /// assert_eq!(txid, matches[0]); - /// ``` - pub fn from_block_with_predicate(block: &Block, match_txids: F) -> Self - where - F: Fn(&Txid) -> bool, - { - let block_txids: Vec<_> = block.txdata.iter().map(Transaction::txid).collect(); - Self::from_header_txids_with_predicate(&block.header, &block_txids, match_txids) - } +impl fmt::Display for MerkleBlockError { + fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { + use self::MerkleBlockError::*; - /// Create a MerkleBlock from the block's header and txids, that contain proofs for specific txids. - /// - /// The `header` is the block header, `block_txids` is the full list of txids included in the block and - /// `match_txids` is a function that returns true for the ids that should be included in the partial merkle tree. - pub fn from_header_txids_with_predicate( - header: &block::Header, - block_txids: &[Txid], - match_txids: F, - ) -> Self - where - F: Fn(&Txid) -> bool, - { - let matches: Vec = block_txids.iter().map(match_txids).collect(); - - let pmt = PartialMerkleTree::from_txids(block_txids, &matches); - MerkleBlock { header: *header, txn: pmt } - } - - /// Extract the matching txid's represented by this partial merkle tree - /// and their respective indices within the partial tree. - /// returns Ok(()) on success, or error in case of failure - pub fn extract_matches( - &self, - matches: &mut Vec, - indexes: &mut Vec, - ) -> Result<(), MerkleBlockError> { - let merkle_root = self.txn.extract_matches(matches, indexes)?; - - if merkle_root.eq(&self.header.merkle_root) { - Ok(()) - } else { - Err(MerkleRootMismatch) + match *self { + MerkleRootMismatch => write!(f, "merkle header root doesn't match to the root calculated from the partial merkle tree"), + NoTransactions => write!(f, "partial merkle tree contains no transactions"), + TooManyTransactions => write!(f, "too many transactions"), + BadFormat(ref s) => write!(f, "general format error: {}", s), } } } -impl Encodable for MerkleBlock { - fn consensus_encode(&self, w: &mut W) -> Result { - let len = self.header.consensus_encode(w)? + self.txn.consensus_encode(w)?; - Ok(len) - } -} +#[cfg(feature = "std")] +#[cfg_attr(docsrs, doc(cfg(feature = "std")))] +impl std::error::Error for MerkleBlockError { + fn source(&self) -> Option<&(dyn std::error::Error + 'static)> { + use self::MerkleBlockError::*; -impl Decodable for MerkleBlock { - fn consensus_decode(r: &mut R) -> Result { - Ok(MerkleBlock { - header: Decodable::consensus_decode(r)?, - txn: Decodable::consensus_decode(r)?, - }) + match *self { + MerkleRootMismatch | NoTransactions | TooManyTransactions | BadFormat(_) => None, + } } } @@ -509,21 +509,18 @@ mod tests { use crate::internal_macros::hex; use crate::{Block, Txid}; - /// accepts `pmt_test_$num` - #[cfg(feature = "rand-std")] - fn pmt_test_from_name(name: &str) { pmt_test(name[9..].parse().unwrap()) } - #[cfg(feature = "rand-std")] macro_rules! pmt_tests { - ($($name:ident),* $(,)?) => { - $( - #[test] - fn $name() { - pmt_test_from_name(stringify!($name)); + ($($name:ident),* $(,)?) => { + $( + #[test] + fn $name() { + pmt_test_from_name(stringify!($name)); + } + )* } - )* } -} + #[cfg(feature = "rand-std")] pmt_tests!( pmt_test_1, @@ -540,6 +537,10 @@ mod tests { pmt_test_4095 ); + /// Parses the transaction count out of `name` with form: `pmt_test_$num`. + #[cfg(feature = "rand-std")] + fn pmt_test_from_name(name: &str) { pmt_test(name[9..].parse().unwrap()) } + #[cfg(feature = "rand-std")] fn pmt_test(tx_count: usize) { use core::cmp::min; @@ -638,22 +639,16 @@ mod tests { fn merkleblock_serialization() { // Got it by running the rpc call // `gettxoutproof '["220ebc64e21abece964927322cba69180ed853bb187fbc6923bac7d010b9d87a"]'` - const MB_HEX: &str = - "0100000090f0a9f110702f808219ebea1173056042a714bad51b916cb6800000000000005275289558f51c\ - 9966699404ae2294730c3c9f9bda53523ce50e9b95e558da2fdb261b4d4c86041b1ab1bf930900000005fac\ - 7708a6e81b2a986dea60db2663840ed141130848162eb1bd1dee54f309a1b2ee1e12587e497ada70d9bd10d\ - 31e83f0a924825b96cb8d04e8936d793fb60db7ad8b910d0c7ba2369bc7f18bb53d80e1869ba2c32274996c\ - ebe1ae264bc0e2289189ff0316cdc10511da71da757e553cada9f3b5b1434f3923673adb57d83caac392c38\ - af156d6fc30b55fad4112df2b95531e68114e9ad10011e72f7b7cfdb025700"; + let mb_hex = include_str!("../../tests/data/merkle_block.hex"); - let mb: MerkleBlock = deserialize(&hex!(MB_HEX)).unwrap(); + let mb: MerkleBlock = deserialize(&hex!(mb_hex)).unwrap(); assert_eq!(get_block_13b8a().block_hash(), mb.header.block_hash()); assert_eq!( mb.header.merkle_root, mb.txn.extract_matches(&mut vec![], &mut vec![]).unwrap() ); // Serialize again and check that it matches the original bytes - assert_eq!(MB_HEX, serialize(&mb).to_lower_hex_string().as_str()); + assert_eq!(mb_hex, serialize(&mb).to_lower_hex_string().as_str()); } /// Create a CMerkleBlock using a list of txids which will be found in the @@ -735,78 +730,8 @@ mod tests { /// Returns a real block (0000000000013b8ab2cd513b0261a14096412195a72a0c4827d229dcc7e0f7af) /// with 9 txs. fn get_block_13b8a() -> Block { - const BLOCK_HEX: &str = - "0100000090f0a9f110702f808219ebea1173056042a714bad51b916cb6800000000000005275289558f51c\ - 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067b3a0aa42070082dcb0bf2f388b6495cf33d789904f07d0f55c40fbd4b82963c69b3dc31895d0c772c812\ - b1d5fbcade15312ef1c0e8ebbb12dcd4ffffffff01404b4c00000000001976a9142b6ba7c9d796b75eef794\ - 2fc9288edd37c32f5c388ac00000000010000000166d7577163c932b4f9690ca6a80b6e4eb001f0a2fa9023\ - df5595602aae96ed8d000000008a4730440220262b42546302dfb654a229cefc86432b89628ff259dc87edd\ - 1154535b16a67e102207b4634c020a97c3e7bbd0d4d19da6aa2269ad9dded4026e896b213d73ca4b63f0141\ - 04979b82d02226b3a4597523845754d44f13639e3bf2df5e82c6aab2bdc79687368b01b1ab8b19875ae3c90\ - d661a3d0a33161dab29934edeb36aa01976be3baf8affffffff02404b4c00000000001976a9144854e695a0\ - 2af0aeacb823ccbc272134561e0a1688ac40420f00000000001976a914abee93376d6b37b5c2940655a6fca\ - f1c8e74237988ac0000000001000000014e3f8ef2e91349a9059cb4f01e54ab2597c1387161d3da89919f7e\ - a6acdbb371010000008c49304602210081f3183471a5ca22307c0800226f3ef9c353069e0773ac76bb58065\ - 4d56aa523022100d4c56465bdc069060846f4fbf2f6b20520b2a80b08b168b31e66ddb9c694e24001410497\ - 6c79848e18251612f8940875b2b08d06e6dc73b9840e8860c066b7e87432c477e9a59a453e71e6d76d5fe34\ - 058b800a098fc1740ce3012e8fc8a00c96af966ffffffff02c0e1e400000000001976a9144134e75a6fcb60\ - 42034aab5e18570cf1f844f54788ac404b4c00000000001976a9142b6ba7c9d796b75eef7942fc9288edd37\ - c32f5c388ac00000000"; - deserialize(&hex!(BLOCK_HEX)).unwrap() + use crate::hashes::hex::FromHex; + let block_hex = include_str!("../../tests/data/block_13b8a.hex"); + deserialize(&Vec::from_hex(block_hex).unwrap()).unwrap() } } diff --git a/bitcoin/tests/data/block_13b8a.hex b/bitcoin/tests/data/block_13b8a.hex new file mode 100644 index 00000000..6e83915b --- /dev/null +++ b/bitcoin/tests/data/block_13b8a.hex @@ -0,0 +1 @@ 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\ No newline at end of file diff --git a/bitcoin/tests/data/merkle_block.hex b/bitcoin/tests/data/merkle_block.hex new file mode 100644 index 00000000..c9a32c9a --- /dev/null +++ b/bitcoin/tests/data/merkle_block.hex @@ -0,0 +1 @@ +0100000090f0a9f110702f808219ebea1173056042a714bad51b916cb6800000000000005275289558f51c9966699404ae2294730c3c9f9bda53523ce50e9b95e558da2fdb261b4d4c86041b1ab1bf930900000005fac7708a6e81b2a986dea60db2663840ed141130848162eb1bd1dee54f309a1b2ee1e12587e497ada70d9bd10d31e83f0a924825b96cb8d04e8936d793fb60db7ad8b910d0c7ba2369bc7f18bb53d80e1869ba2c32274996cebe1ae264bc0e2289189ff0316cdc10511da71da757e553cada9f3b5b1434f3923673adb57d83caac392c38af156d6fc30b55fad4112df2b95531e68114e9ad10011e72f7b7cfdb025700 \ No newline at end of file