NRD kernel variant (compile against grin master) (#408)

* wip

* hardcode NRD kernel during tx building

* commit

* compiles against grin with NRD kernel variant

libwallet/src/error.rs

@@ -278,6 +278,10 @@ pub enum ErrorKind {
 	#[fail(display = "Unknown Kernel Feature: {}", _0)]
 	UnknownKernelFeatures(u8),
 
+	/// Invalid Kernel Feature
+	#[fail(display = "Invalid Kernel Feature: {}", _0)]
+	InvalidKernelFeatures(u8),
+
 	/// Invalid Slatepack Data
 	#[fail(display = "Invalid Slatepack Data: {}", _0)]
 	InvalidSlatepackData(String),

libwallet/src/slate.rs

@@ -18,8 +18,8 @@
 use crate::error::{Error, ErrorKind};
 use crate::grin_core::core::amount_to_hr_string;
 use crate::grin_core::core::transaction::{
-	Input, KernelFeatures, Output, OutputFeatures, Transaction, TransactionBody, TxKernel,
-	Weighting,
+	Input, KernelFeatures, NRDRelativeHeight, Output, OutputFeatures, Transaction, TransactionBody,
+	TxKernel, Weighting,
 };
 use crate::grin_core::core::verifier_cache::LruVerifierCache;
 use crate::grin_core::libtx::{aggsig, build, proof::ProofBuild, tx_fee};
@@ -114,7 +114,11 @@ pub struct Slate {
 	/// should refuse to process the transaction and unlock all
 	/// associated outputs
 	pub ttl_cutoff_height: u64,
-	/// Kernel Features flag, if any
+	/// Kernel Features flag -
+	/// 	0: plain
+	/// 	1: coinbase (invalid)
+	/// 	2: height_locked
+	/// 	3: NRD
 	pub kernel_features: u8,
 	/// Offset, needed when posting of tranasction is deferred
 	pub offset: BlindingFactor,
@@ -160,7 +164,7 @@ pub enum SlateState {
 #[derive(Debug, Clone, PartialEq, Eq)]
 /// Kernel features arguments definition
 pub struct KernelFeaturesArgs {
-	/// Lock height, for HeightLocked
+	/// Lock height, for HeightLocked (also NRD relative lock height)
 	pub lock_height: u64,
 }
 
@@ -346,12 +350,17 @@ impl Slate {
 		Ok(())
 	}
 
-	// Construct the appropriate kernel features based on our fee and lock_height.
-	// If lock_height is 0 then its a plain kernel, otherwise its a height locked kernel.
+	// Build kernel features based on variant and associated data.
+	// 0: plain
+	// 1: coinbase (invalid)
+	// 2: height_locked (with associated lock_height)
+	// 3: NRD (with associated relative_height)
+	// Any other value is invalid.
 	fn kernel_features(&self) -> Result<KernelFeatures, Error> {
 		match self.kernel_features {
 			0 => Ok(KernelFeatures::Plain { fee: self.fee }),
-			1 => Ok(KernelFeatures::HeightLocked {
+			1 => Err(ErrorKind::InvalidKernelFeatures(1).into()),
+			2 => Ok(KernelFeatures::HeightLocked {
 				fee: self.fee,
 				lock_height: match &self.kernel_features_args {
 					Some(a) => a.lock_height,
@@ -360,7 +369,16 @@ impl Slate {
 					}
 				},
 			}),
-			n => return Err(ErrorKind::UnknownKernelFeatures(n).into()),
+			3 => Ok(KernelFeatures::NoRecentDuplicate {
+				fee: self.fee,
+				relative_height: match &self.kernel_features_args {
+					Some(a) => NRDRelativeHeight::new(a.lock_height)?,
+					None => {
+						return Err(ErrorKind::KernelFeaturesMissing(format!("lock_height")).into())
+					}
+				},
+			}),
+			n => Err(ErrorKind::UnknownKernelFeatures(n).into()),
 		}
 	}
 
@@ -996,6 +1014,14 @@ impl From<&TxKernel> for TxKernelV4 {
 			KernelFeatures::HeightLocked { fee, lock_height } => {
 				(CompatKernelFeatures::HeightLocked, fee, lock_height)
 			}
+			KernelFeatures::NoRecentDuplicate {
+				fee,
+				relative_height,
+			} => (
+				CompatKernelFeatures::NoRecentDuplicate,
+				fee,
+				relative_height.into(),
+			),
 		};
 		TxKernelV4 {
 			features,
@@ -1257,6 +1283,11 @@ impl From<&TxKernelV4> for TxKernel {
 			CompatKernelFeatures::Plain => KernelFeatures::Plain { fee },
 			CompatKernelFeatures::Coinbase => KernelFeatures::Coinbase,
 			CompatKernelFeatures::HeightLocked => KernelFeatures::HeightLocked { fee, lock_height },
+			CompatKernelFeatures::NoRecentDuplicate => KernelFeatures::NoRecentDuplicate {
+				fee,
+				relative_height: NRDRelativeHeight::new(lock_height)
+					.expect("a valid NRD relative height"),
+			},
 		};
 		TxKernel {
 			features,
@@ -1271,4 +1302,5 @@ pub enum CompatKernelFeatures {
 	Plain,
 	Coinbase,
 	HeightLocked,
+	NoRecentDuplicate,
 }

libwallet/src/slate_versions/v4.rs

@@ -689,14 +689,27 @@ impl TryFrom<&SlateV4> for SlateV3 {
 		let id = *id;
 		let amount = *amount;
 		let fee = *fee;
+
+		// Match on kernel feature variant:
+		// 0: plain
+		// 1: coinbase (invalid)
+		// 2: height locked (with associated lock_height)
+		// 3: NRD (with associated relative_height)
+		// Anything else is unknown.
 		let lock_height = match feat {
 			0 => 0,
-			1 => match feat_args {
+			1 => return Err(ErrorKind::InvalidKernelFeatures(1).into()),
+			2 => match feat_args {
+				None => return Err(ErrorKind::KernelFeaturesMissing("lock_hgt".to_owned()).into()),
+				Some(h) => h.lock_hgt,
+			},
+			3 => match feat_args {
 				None => return Err(ErrorKind::KernelFeaturesMissing("lock_hgt".to_owned()).into()),
 				Some(h) => h.lock_hgt,
 			},
 			n => return Err(ErrorKind::UnknownKernelFeatures(*n).into()),
 		};
+
 		let participant_data = map_vec!(participant_data, |data| ParticipantDataV3::from(data));
 		let version_info = VersionCompatInfoV3::from(ver);
 		let payment_proof = match payment_proof {
@@ -783,6 +796,14 @@ impl From<&SlateV4> for Option<TransactionV3> {
 								out_lock_height = lock_height;
 								CompatKernelFeatures::HeightLocked
 							}
+							KernelFeatures::NoRecentDuplicate {
+								fee,
+								relative_height,
+							} => {
+								out_fee = fee;
+								out_lock_height = relative_height.into();
+								CompatKernelFeatures::NoRecentDuplicate
+							}
 						},
 						fee: out_fee,
 						lock_height: out_lock_height,

util/Cargo.toml

@@ -43,12 +43,12 @@ grin_api = { git = "https://github.com/mimblewimble/grin", branch = "master" }
 grin_store = { git = "https://github.com/mimblewimble/grin", branch = "master" }
 
 # For local testing
-#grin_core = { path = "../../grin/core"}
-#grin_keychain = { path = "../../grin/keychain"}
-#grin_chain = { path = "../../grin/chain"}
-#grin_util = { path = "../../grin/util"}
-#grin_api = { path = "../../grin/api"}
-#grin_store = { path = "../../grin/store"}
+# grin_core = { path = "../../grin/core"}
+# grin_keychain = { path = "../../grin/keychain"}
+# grin_chain = { path = "../../grin/chain"}
+# grin_util = { path = "../../grin/util"}
+# grin_api = { path = "../../grin/api"}
+# grin_store = { path = "../../grin/store"}
 
 [dev-dependencies]
 pretty_assertions = "0.5.1"