Merge pull request #1162 from interlay/feat/bitcoin-compat

feat: basic bitcoin type conversions

crates/bitcoin/Cargo.toml

@@ -15,6 +15,7 @@ spin = { version = "0.7.1", default-features = false }
 primitive-types = { version = "0.12.1", default-features = false, features = ["codec", "scale-info"] }
 bitcoin_hashes = { version = "0.7.3", default-features = false }
 secp256k1 = { package = "secp256k1", git = "https://github.com/rust-bitcoin/rust-secp256k1", rev = "8e61874", default-features = false }
+rust-bitcoin = { package = "bitcoin", version = "0.30.1", default-features = false, features = ["no-std"], optional = true }
 
 [dev-dependencies]
 mocktopus = "0.8.0"
@@ -33,9 +34,11 @@ std = [
 	"primitive-types/std",
 	"primitive-types/serde",
 	"secp256k1/std",
+	"rust-bitcoin?/std"
 ]
 parser = []
 runtime-benchmarks = []
+bitcoin-types-compat = ["rust-bitcoin", "parser"]
 
 [[example]]
 name = "parse-transaction"

crates/bitcoin/src/compat.rs

@@ -0,0 +1,119 @@
+//! Provides conversions between rust-bitcoin and interbtc types.
+//! Please note that these operations involve (unbounded) re-encoding
+//! and decoding so may be expensive to use.
+
+use crate::{formatter::TryFormat, parser::Parsable};
+use rust_bitcoin::consensus::{Decodable, Encodable};
+
+pub use rust_bitcoin;
+
+#[cfg(not(feature = "std"))]
+use alloc::vec::Vec;
+
+#[derive(Debug)]
+pub enum ConversionError {
+    ParsingError,
+    FormattingError,
+}
+
+/// Macro to implement type conversion from interbtc types to rust-bitcoin, using consensus encoding
+macro_rules! impl_bitcoin_conversion {
+    ($a:path, $b:path) => {
+        impl TryFrom<$a> for $b {
+            type Error = ConversionError;
+            fn try_from(value: $a) -> Result<Self, Self::Error> {
+                let mut bytes = Vec::<u8>::new();
+                value
+                    .try_format(&mut bytes)
+                    .map_err(|_| ConversionError::FormattingError)?;
+                let result = Self::consensus_decode_from_finite_reader(&mut &bytes[..])
+                    .map_err(|_| ConversionError::ParsingError)?;
+                Ok(result)
+            }
+        }
+    };
+}
+
+/// Macro to implement type conversion to interbtc types from rust-bitcoin, using consensus encoding
+macro_rules! impl_interbtc_conversion {
+    ($a:path, $b:path) => {
+        impl TryFrom<$b> for $a {
+            type Error = ConversionError;
+            fn try_from(value: $b) -> Result<Self, Self::Error> {
+                let mut data: Vec<u8> = Vec::new();
+                value
+                    .consensus_encode(&mut data)
+                    .map_err(|_| ConversionError::FormattingError)?;
+                let result = Self::parse(&data, 0).map_err(|_| ConversionError::ParsingError)?;
+                Ok(result.0)
+            }
+        }
+    };
+}
+
+macro_rules! impl_bidirectional_conversions {
+    ($a:path, $b:path) => {
+        impl_bitcoin_conversion!($a, $b);
+        impl_interbtc_conversion!($a, $b);
+    };
+}
+
+// NOTE: rust_bitcoin::Script exists but we can't convert to that because it's unsized
+impl_bitcoin_conversion!(crate::Script, rust_bitcoin::ScriptBuf);
+
+// Transaction conversions
+impl_bidirectional_conversions!(crate::types::Transaction, rust_bitcoin::Transaction);
+
+// Payload -> Address
+impl TryFrom<rust_bitcoin::address::Payload> for crate::Address {
+    type Error = ConversionError;
+    fn try_from(value: rust_bitcoin::address::Payload) -> Result<Self, Self::Error> {
+        let bitcoin_script = value.script_pubkey();
+        let bitcoin_script_bytes = bitcoin_script.to_bytes();
+        let interlay_script = crate::Script::from(bitcoin_script_bytes);
+        crate::Address::from_script_pub_key(&interlay_script).map_err(|_| ConversionError::ParsingError)
+    }
+}
+
+// Address -> Payload
+impl TryFrom<crate::Address> for rust_bitcoin::address::Payload {
+    type Error = ConversionError;
+    fn try_from(value: crate::Address) -> Result<Self, Self::Error> {
+        let interlay_script = value.to_script_pub_key();
+        let bitcoin_script = rust_bitcoin::blockdata::script::Script::from_bytes(interlay_script.as_bytes());
+        rust_bitcoin::address::Payload::from_script(&bitcoin_script).map_err(|_| ConversionError::ParsingError)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::parser::parse_transaction;
+
+    #[test]
+    fn test_transaction_compat() {
+        // txid eb3db053cd139147f2fd676cf59a491fd5aebc54bddfde829704585b659126fc
+        let raw_tx = "0100000000010120e6fb8f0e2cfb8667a140a92d045d5db7c1b56635790bc907c3e71d43720a150e00000017160014641e441c2ba32dd7cf05afde7922144dd106b09bffffffff019dbd54000000000017a914bd847a4912984cf6152547feca51c1b9c2bcbe2787024830450221008f00033064c26cfca4dc98e5dba800b18729c3441dca37b49358ae0df9be7fad02202a81085318466ea66ef390d5dab6737e44a05f7f2e747932ebba917e0098f37d012102c109fc47335c3a2e206d462ad52590b1842aa9d6e0eb9c683c896fa8723590b400000000";
+        let tx_bytes = hex::decode(&raw_tx).unwrap();
+        let interlay_transaction = parse_transaction(&tx_bytes).unwrap();
+
+        let rust_bitcoin_transaction: rust_bitcoin::Transaction = interlay_transaction.clone().try_into().unwrap();
+
+        // check that the rust-bitcoin type encodes to the same bytes
+        let mut re_encoded_bytes: Vec<u8> = Vec::new();
+        rust_bitcoin_transaction
+            .consensus_encode(&mut re_encoded_bytes)
+            .unwrap();
+        assert_eq!(tx_bytes, re_encoded_bytes);
+
+        // check that the conversion back works
+        assert_eq!(interlay_transaction, rust_bitcoin_transaction.try_into().unwrap());
+    }
+
+    #[test]
+    fn test_address_compat() {
+        let interbtc_address = crate::Address::P2WPKHv0(primitive_types::H160([1; 20]));
+        let rust_bitcoin_address: rust_bitcoin::address::Payload = interbtc_address.clone().try_into().unwrap();
+        assert_eq!(interbtc_address, rust_bitcoin_address.try_into().unwrap());
+    }
+}

crates/bitcoin/src/lib.rs

@@ -45,6 +45,9 @@ pub mod formatter;
 #[cfg(any(feature = "parser", test))]
 pub mod parser;
 
+#[cfg(feature = "bitcoin-types-compat")]
+pub mod compat;
+
 pub mod utils;
 
 pub mod pow;