Make a transaction trait (#98)

* Impl Transaction trait

* Impl Transaction for MockTransaction

* <ake carnot transaction a module

* Refactor consensus to use Transaction

* Fix tests

* Constrain Transaction::Hash

* Refactor redundant Carnot in CarnotTx

nodes/mockpool-node/src/bridges.rs

@@ -6,7 +6,7 @@ use tokio::sync::mpsc::Sender;
 use tokio::sync::oneshot;
 use tracing::error;
 // internal
-use crate::tx::{Tx, TxId};
+use crate::tx::Tx;
 use futures::future::join_all;
 use multiaddr::Multiaddr;
 use nomos_core::wire;
@@ -27,15 +27,14 @@ pub fn mempool_metrics_bridge(
     handle: overwatch_rs::overwatch::handle::OverwatchHandle,
 ) -> HttpBridgeRunner {
     Box::new(Box::pin(async move {
-        let (mempool_channel, mut http_request_channel) = build_http_bridge::<
+        let (mempool_channel, mut http_request_channel) =
-            MempoolService<WakuAdapter<Tx>, MockPool<TxId, Tx>>,
+            build_http_bridge::<MempoolService<WakuAdapter<Tx>, MockPool<Tx>>, AxumBackend, _>(
-            AxumBackend,
+                handle,
-            _,
+                HttpMethod::GET,
-        >(
+                "metrics",
-            handle, HttpMethod::GET, "metrics"
+            )
-        )
+            .await
-        .await
+            .unwrap();
-        .unwrap();
 
         while let Some(HttpRequest { res_tx, .. }) = http_request_channel.recv().await {
             if let Err(e) = handle_metrics_req(&mempool_channel, res_tx).await {
@@ -50,17 +49,14 @@ pub fn mempool_add_tx_bridge(
     handle: overwatch_rs::overwatch::handle::OverwatchHandle,
 ) -> HttpBridgeRunner {
     Box::new(Box::pin(async move {
-        let (mempool_channel, mut http_request_channel) = build_http_bridge::<
+        let (mempool_channel, mut http_request_channel) =
-            MempoolService<WakuAdapter<Tx>, MockPool<TxId, Tx>>,
+            build_http_bridge::<MempoolService<WakuAdapter<Tx>, MockPool<Tx>>, AxumBackend, _>(
-            AxumBackend,
+                handle.clone(),
-            _,
+                HttpMethod::POST,
-        >(
+                "addtx",
-            handle.clone(),
+            )
-            HttpMethod::POST,
+            .await
-            "addtx",
+            .unwrap();
-        )
-        .await
-        .unwrap();
 
         while let Some(HttpRequest {
             res_tx, payload, ..
@@ -121,7 +117,7 @@ pub fn waku_add_conn_bridge(
 }
 
 async fn handle_metrics_req(
-    mempool_channel: &OutboundRelay<MempoolMsg<Tx, TxId>>,
+    mempool_channel: &OutboundRelay<MempoolMsg<Tx>>,
     res_tx: Sender<HttpResponse>,
 ) -> Result<(), overwatch_rs::DynError> {
     let (sender, receiver) = oneshot::channel();
@@ -147,7 +143,7 @@ async fn handle_metrics_req(
 
 async fn handle_add_tx_req(
     handle: &overwatch_rs::overwatch::handle::OverwatchHandle,
-    mempool_channel: &OutboundRelay<MempoolMsg<Tx, TxId>>,
+    mempool_channel: &OutboundRelay<MempoolMsg<Tx>>,
     res_tx: Sender<HttpResponse>,
     payload: Option<Bytes>,
 ) -> Result<(), overwatch_rs::DynError> {

nodes/mockpool-node/src/main.rs

@@ -18,7 +18,7 @@ use overwatch_rs::{
 };
 use serde::Deserialize;
 use std::sync::Arc;
-use tx::{Tx, TxId};
+use tx::Tx;
 
 /// Simple program to greet a person
 #[derive(Parser, Debug)]
@@ -39,7 +39,7 @@ struct Config {
 struct MockPoolNode {
     logging: ServiceHandle<Logger>,
     network: ServiceHandle<NetworkService<Waku>>,
-    mockpool: ServiceHandle<MempoolService<WakuAdapter<Tx>, MockPool<TxId, Tx>>>,
+    mockpool: ServiceHandle<MempoolService<WakuAdapter<Tx>, MockPool<Tx>>>,
     http: ServiceHandle<HttpService<AxumBackend>>,
     bridges: ServiceHandle<HttpBridgeService>,
 }

nodes/mockpool-node/src/tx.rs

@@ -1,42 +1,20 @@
-use blake2::digest::{Update, VariableOutput};
+use bytes::Bytes;
-use blake2::Blake2bVar;
+use nomos_core::tx::{Transaction, TransactionHasher};
 use serde::{Deserialize, Serialize};
 use std::hash::Hash;
 
 #[derive(Clone, Debug, Serialize, Deserialize, Hash)]
 pub struct Tx(pub String);
 
-#[derive(Debug, Eq, Hash, PartialEq, Ord, Clone, PartialOrd)]
+fn hash_tx(tx: &Tx) -> String {
-pub struct TxId([u8; 32]);
+    tx.0.clone()
-
-impl From<&Tx> for TxId {
-    fn from(tx: &Tx) -> Self {
-        let mut hasher = Blake2bVar::new(32).unwrap();
-        hasher.update(
-            bincode::serde::encode_to_vec(tx, bincode::config::standard())
-                .unwrap()
-                .as_slice(),
-        );
-        let mut id = [0u8; 32];
-        hasher.finalize_variable(&mut id).unwrap();
-        Self(id)
-    }
 }
 
-#[cfg(test)]
+impl Transaction for Tx {
-mod test {
+    const HASHER: TransactionHasher<Self> = hash_tx;
-    use super::*;
+    type Hash = String;
 
-    #[test]
+    fn as_bytes(&self) -> Bytes {
-    fn test_txid() {
+        self.0.as_bytes().to_vec().into()
-        let tx = Tx("test".to_string());
-        let txid = TxId::from(&tx);
-        assert_eq!(
-            txid.0,
-            [
-                39, 227, 252, 176, 211, 134, 68, 39, 134, 158, 47, 7, 82, 40, 169, 232, 168, 118,
-                240, 103, 84, 146, 127, 64, 60, 196, 126, 142, 172, 156, 124, 78
-            ]
-        );
     }
 }

nomos-core/Cargo.toml

@@ -10,6 +10,7 @@ authors = [
 
 [dependencies]
 async-trait = { version = "0.1" }
+blake2 = { version = "0.10" }
 bytes = "1.3"
 futures = "0.3"
 nomos-network = { path = "../nomos-services/network", optional = true }
@@ -19,7 +20,6 @@ thiserror = "1.0"
 bincode = "1.3"
 once_cell = "1.0"
 indexmap = { version = "1.9", features = ["serde-1"] }
-blake2 = { version = "0.10", optional = true }
 serde_json = { version = "1", optional = true }
 
 [dev-dependencies]
@@ -30,4 +30,4 @@ tokio = { version = "1.23", features = ["macros", "rt"] }
 [features]
 default = []
 raptor = ["raptorq"]
-mock = ["nomos-network/mock", "blake2", "serde_json"]
+mock = ["nomos-network/mock", "serde_json"]

nomos-core/src/block.rs

@@ -10,7 +10,7 @@ pub type TxHash = [u8; 32];
 
 /// A block
 #[derive(Clone, Debug, Serialize, Deserialize)]
-pub struct Block<TxId: Eq + Hash> {
+pub struct Block<TxId: Clone + Eq + Hash> {
     header: BlockHeader,
     transactions: IndexSet<TxId>,
 }
@@ -24,7 +24,7 @@ pub struct BlockHeader {
 /// Identifier of a block
 pub type BlockId = [u8; 32];
 
-impl<TxId: Eq + Hash> Block<TxId> {
+impl<TxId: Clone + Eq + Hash> Block<TxId> {
     pub fn new(header: BlockHeader, txs: impl Iterator<Item = TxId>) -> Self {
         Self {
             header,

nomos-core/src/tx/carnot.rs

@@ -1,10 +0,0 @@
-// std
-// crates
-use serde::{Deserialize, Serialize};
-// internal
-pub use crate::tx::transaction::Transaction;
-
-#[derive(Clone, Debug, Serialize, Deserialize)]
-pub enum Tx {
-    Transfer(Transaction),
-}

nomos-core/src/tx/carnot/mod.rs

@@ -0,0 +1,35 @@
+// std
+// crates
+use bytes::Bytes;
+use serde::{Deserialize, Serialize};
+// internal
+pub use crate::tx::carnot::transaction::TransferTransaction;
+use crate::tx::{Transaction, TransactionHasher};
+
+mod transaction;
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub enum Tx {
+    Transfer(TransferTransaction),
+}
+
+// TODO: We should probably abstract the de/serialization of the transaction as it s done in transaction.rs
+fn hash_carnot_tx(tx: &Tx) -> [u8; 32] {
+    use blake2::{
+        digest::{consts::U32, Digest},
+        Blake2b,
+    };
+    let mut hasher = Blake2b::<U32>::new();
+    hasher.update(<Tx as Transaction>::as_bytes(tx));
+    let res = hasher.finalize();
+    res.into()
+}
+
+impl Transaction for Tx {
+    const HASHER: TransactionHasher<Self> = hash_carnot_tx;
+    type Hash = [u8; 32];
+
+    fn as_bytes(&self) -> Bytes {
+        [].to_vec().into()
+    }
+}

nomos-core/src/tx/carnot/transaction.rs

@@ -7,7 +7,7 @@ use crate::crypto::Signature;
 /// but does not imply that it can be successfully applied
 /// to the ledger.
 #[derive(Clone, Debug)]
-pub struct Transaction {
+pub struct TransferTransaction {
     pub from: AccountId,
     pub to: AccountId,
     pub value: u64,
@@ -26,26 +26,26 @@ mod serde {
     // This would also allow to control ser/de independently from the Rust
     // representation.
     #[derive(Serialize, Deserialize)]
-    struct WireTransaction {
+    struct WireTransferTransaction {
         from: AccountId,
         to: AccountId,
         value: u64,
         signature: Signature,
     }
 
-    impl<'de> Deserialize<'de> for Transaction {
+    impl<'de> Deserialize<'de> for TransferTransaction {
         fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
         where
             D: Deserializer<'de>,
         {
-            let WireTransaction {
+            let WireTransferTransaction {
                 from,
                 to,
                 value,
                 signature,
-            } = WireTransaction::deserialize(deserializer)?;
+            } = WireTransferTransaction::deserialize(deserializer)?;
             //TODO: check signature
-            Ok(Transaction {
+            Ok(TransferTransaction {
                 from,
                 to,
                 value,
@@ -54,12 +54,12 @@ mod serde {
         }
     }
 
-    impl Serialize for Transaction {
+    impl Serialize for TransferTransaction {
         fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where
             S: Serializer,
         {
-            WireTransaction {
+            WireTransferTransaction {
                 from: self.from.clone(),
                 to: self.to.clone(),
                 value: self.value,

nomos-core/src/tx/mock.rs

@@ -1,8 +1,11 @@
+use crate::tx::{Transaction, TransactionHasher};
+use crate::wire;
 use crate::wire::serialize;
 use blake2::{
     digest::{Update, VariableOutput},
     Blake2bVar,
 };
+use bytes::{Bytes, BytesMut};
 use nomos_network::backends::mock::MockMessage;
 
 #[derive(Debug, Clone, Eq, PartialEq, Hash, serde::Serialize, serde::Deserialize)]
@@ -20,6 +23,27 @@ impl MockTransaction {
     pub fn message(&self) -> &MockMessage {
         &self.content
     }
+
+    pub fn id(&self) -> MockTxId {
+        self.id
+    }
+
+    fn as_bytes(&self) -> Bytes {
+        let mut buff = BytesMut::new();
+        wire::serializer_into_buffer(&mut buff)
+            .serialize_into(&self)
+            .expect("MockTransaction serialization to buffer failed");
+        buff.freeze()
+    }
+}
+
+impl Transaction for MockTransaction {
+    const HASHER: TransactionHasher<Self> = MockTransaction::id;
+    type Hash = MockTxId;
+
+    fn as_bytes(&self) -> Bytes {
+        MockTransaction::as_bytes(self)
+    }
 }
 
 impl From<nomos_network::backends::mock::MockMessage> for MockTransaction {

nomos-core/src/tx/mod.rs

@@ -1,4 +1,20 @@
+use std::hash::Hash;
+// std
+// crates
+use bytes::Bytes;
+// internal
+
 pub mod carnot;
 #[cfg(feature = "mock")]
 pub mod mock;
-mod transaction;
+
+pub type TransactionHasher<T> = fn(&T) -> <T as Transaction>::Hash;
+
+pub trait Transaction {
+    const HASHER: TransactionHasher<Self>;
+    type Hash: Hash + Eq + Clone;
+    fn hash(&self) -> Self::Hash {
+        Self::HASHER(self)
+    }
+    fn as_bytes(&self) -> Bytes;
+}

nomos-services/consensus/src/leadership.rs

@@ -2,6 +2,7 @@
 use std::marker::PhantomData;
 // crates
 // internal
+use nomos_core::tx::Transaction;
 use nomos_core::{block::BlockHeader, crypto::PrivateKey};
 use nomos_mempool::MempoolMsg;
 
@@ -12,12 +13,12 @@ struct Enclave {
     key: PrivateKey,
 }
 
-pub struct Leadership<Tx, Id> {
+pub struct Leadership<Tx: Transaction> {
     key: Enclave,
-    mempool: OutboundRelay<MempoolMsg<Tx, Id>>,
+    mempool: OutboundRelay<MempoolMsg<Tx>>,
 }
 
-pub enum LeadershipResult<'view, TxId: Eq + core::hash::Hash> {
+pub enum LeadershipResult<'view, TxId: Clone + Eq + core::hash::Hash> {
     Leader {
         block: Block<TxId>,
         _view: PhantomData<&'view u8>,
@@ -27,12 +28,12 @@ pub enum LeadershipResult<'view, TxId: Eq + core::hash::Hash> {
     },
 }
 
-impl<Tx, Id> Leadership<Tx, Id>
+impl<Tx> Leadership<Tx>
 where
-    Id: Eq + core::hash::Hash,
+    Tx: Transaction,
-    for<'t> &'t Tx: Into<Id>, // TODO: we should probably abstract this away but for now the constrain may do
+    Tx::Hash: Debug,
 {
-    pub fn new(key: PrivateKey, mempool: OutboundRelay<MempoolMsg<Tx, Id>>) -> Self {
+    pub fn new(key: PrivateKey, mempool: OutboundRelay<MempoolMsg<Tx>>) -> Self {
         Self {
             key: Enclave { key },
             mempool,
@@ -45,7 +46,7 @@ where
         view: &'view View,
         tip: &Tip,
         qc: Qc,
-    ) -> LeadershipResult<'view, Id> {
+    ) -> LeadershipResult<'view, Tx::Hash> {
         // TODO: get the correct ancestor for the tip
         // let ancestor_hint = todo!("get the ancestor from the tip");
         let ancestor_hint = [0; 32];
@@ -59,7 +60,10 @@ where
 
             LeadershipResult::Leader {
                 _view: PhantomData,
-                block: Block::new(BlockHeader::default(), iter.map(|ref tx| tx.into())),
+                block: Block::new(
+                    BlockHeader::default(),
+                    iter.map(|ref tx| <Tx as Transaction>::hash(tx)),
+                ),
             }
         } else {
             LeadershipResult::NotLeader { _view: PhantomData }

nomos-services/consensus/src/lib.rs

@@ -18,10 +18,11 @@ use serde::{Deserialize, Serialize};
 // internal
 use crate::network::NetworkAdapter;
 use leadership::{Leadership, LeadershipResult};
-use nomos_core::block::{Block, TxHash};
+use nomos_core::block::Block;
 use nomos_core::crypto::PublicKey;
 use nomos_core::fountain::FountainCode;
 use nomos_core::staking::Stake;
+use nomos_core::tx::Transaction;
 use nomos_core::vote::Tally;
 use nomos_mempool::{backend::MemPool, network::NetworkAdapter as MempoolAdapter, MempoolService};
 use nomos_network::NetworkService;
@@ -79,9 +80,9 @@ where
     M: MempoolAdapter<Tx = P::Tx>,
     P: MemPool,
     T: Tally,
-    O: Overlay<A, F, T>,
+    O: Overlay<A, F, T, <P::Tx as Transaction>::Hash>,
-    P::Tx: Debug + 'static,
+    P::Tx: Transaction + Debug + 'static,
-    P::Id: Debug + 'static,
+    <P::Tx as Transaction>::Hash: Debug,
     A::Backend: 'static,
 {
     service_state: ServiceStateHandle<Self>,
@@ -100,10 +101,10 @@ where
     A: NetworkAdapter,
     P: MemPool,
     T: Tally,
-    P::Tx: Debug,
+    P::Tx: Transaction + Debug,
-    P::Id: Debug,
+    <P::Tx as Transaction>::Hash: Debug,
     M: MempoolAdapter<Tx = P::Tx>,
-    O: Overlay<A, F, T>,
+    O: Overlay<A, F, T, <P::Tx as Transaction>::Hash>,
 {
     const SERVICE_ID: ServiceId = "Carnot";
     type Settings = CarnotSettings<F, T>;
@@ -123,18 +124,9 @@ where
     T::Outcome: Send + Sync,
     P::Settings: Send + Sync + 'static,
     P::Tx: Debug + Clone + serde::de::DeserializeOwned + Send + Sync + 'static,
-    for<'t> &'t P::Tx: Into<TxHash>,
+    <P::Tx as Transaction>::Hash: Debug + Send + Sync,
-    P::Id: Debug
-        + Clone
-        + serde::de::DeserializeOwned
-        + for<'a> From<&'a P::Tx>
-        + Eq
-        + Hash
-        + Send
-        + Sync
-        + 'static,
     M: MempoolAdapter<Tx = P::Tx> + Send + Sync + 'static,
-    O: Overlay<A, F, T, TxId = P::Id> + Send + Sync + 'static,
+    O: Overlay<A, F, T, <P::Tx as Transaction>::Hash> + Send + Sync + 'static,
 {
     fn init(service_state: ServiceStateHandle<Self>) -> Result<Self, overwatch_rs::DynError> {
         let network_relay = service_state.overwatch_handle.relay();
@@ -175,7 +167,7 @@ where
         let fountain = F::new(fountain_settings);
         let tally = T::new(tally_settings);
 
-        let leadership = Leadership::<P::Tx, P::Id>::new(private_key, mempool_relay.clone());
+        let leadership = Leadership::<P::Tx>::new(private_key, mempool_relay.clone());
         // FIXME: this should be taken from config
         let mut cur_view = View {
             seed: [0; 32],
@@ -244,15 +236,16 @@ impl View {
         adapter: &A,
         fountain: &F,
         tally: &T,
-        leadership: &Leadership<Tx, O::TxId>,
+        leadership: &Leadership<Tx>,
-    ) -> Result<(Block<O::TxId>, View), Box<dyn std::error::Error + Send + Sync + 'static>>
+    ) -> Result<(Block<Tx::Hash>, View), Box<dyn std::error::Error + Send + Sync + 'static>>
     where
         A: NetworkAdapter + Send + Sync + 'static,
         F: FountainCode,
-        for<'t> &'t Tx: Into<O::TxId>,
+        Tx: Transaction,
+        Tx::Hash: Debug,
         T: Tally + Send + Sync + 'static,
         T::Outcome: Send + Sync,
-        O: Overlay<A, F, T>,
+        O: Overlay<A, F, T, Tx::Hash>,
     {
         let res = if self.is_leader(node_id) {
             let block = self
@@ -262,7 +255,7 @@ impl View {
             let next_view = self.generate_next_view(&block);
             (block, next_view)
         } else {
-            self.resolve_non_leader::<A, O, F, T>(node_id, adapter, fountain, tally)
+            self.resolve_non_leader::<A, O, F, T, Tx>(node_id, adapter, fountain, tally)
                 .await
                 .unwrap() // FIXME: handle sad path
         };
@@ -283,15 +276,16 @@ impl View {
         adapter: &A,
         fountain: &F,
         tally: &T,
-        leadership: &Leadership<Tx, O::TxId>,
+        leadership: &Leadership<Tx>,
-    ) -> Result<Block<O::TxId>, ()>
+    ) -> Result<Block<<Tx as Transaction>::Hash>, ()>
     where
         A: NetworkAdapter + Send + Sync + 'static,
         F: FountainCode,
         T: Tally + Send + Sync + 'static,
         T::Outcome: Send + Sync,
-        for<'t> &'t Tx: Into<O::TxId>,
+        Tx: Transaction,
-        O: Overlay<A, F, T>,
+        Tx::Hash: Debug,
+        O: Overlay<A, F, T, Tx::Hash>,
     {
         let overlay = O::new(self, node_id);
 
@@ -309,18 +303,20 @@ impl View {
         Ok(block)
     }
 
-    async fn resolve_non_leader<'view, A, O, F, T>(
+    async fn resolve_non_leader<'view, A, O, F, T, Tx>(
         &'view self,
         node_id: NodeId,
         adapter: &A,
         fountain: &F,
         tally: &T,
-    ) -> Result<(Block<O::TxId>, View), ()>
+    ) -> Result<(Block<Tx::Hash>, View), ()>
     where
         A: NetworkAdapter + Send + Sync + 'static,
         F: FountainCode,
         T: Tally + Send + Sync + 'static,
-        O: Overlay<A, F, T>,
+        Tx: Transaction,
+        Tx::Hash: Debug,
+        O: Overlay<A, F, T, Tx::Hash>,
     {
         let overlay = O::new(self, node_id);
         // Consensus in Carnot is achieved in 2 steps from the point of view of a node:
@@ -360,12 +356,12 @@ impl View {
     }
 
     // Verifies the block is new and the previous leader did not fail
-    fn pipelined_safe_block<TxId: Eq + Hash>(&self, _: &Block<TxId>) -> bool {
+    fn pipelined_safe_block<TxId: Clone + Eq + Hash>(&self, _: &Block<TxId>) -> bool {
         // return b.view_n >= self.view_n && b.view_n == b.qc.view_n
         true
     }
 
-    fn generate_next_view<TxId: Eq + Hash>(&self, _b: &Block<TxId>) -> View {
+    fn generate_next_view<TxId: Clone + Eq + Hash>(&self, _b: &Block<TxId>) -> View {
         let mut seed = self.seed;
         seed[0] += 1;
         View {

nomos-services/consensus/src/overlay/committees.rs

@@ -10,44 +10,38 @@ use crate::network::messages::ProposalChunkMsg;
 use crate::network::NetworkAdapter;
 
 /// View of the tree overlay centered around a specific member
-pub struct Member<TxId: Eq + Hash, const C: usize> {
+pub struct Member<const C: usize> {
     // id is not used now, but gonna probably used it for later checking later on
     #[allow(dead_code)]
     id: NodeId,
     committee: Committee,
-    committees: Committees<TxId, C>,
+    committees: Committees<C>,
     view_n: u64,
-    _marker: std::marker::PhantomData<TxId>,
 }
 
 /// #Just a newtype index to be able to implement parent/children methods
 #[derive(Copy, Clone)]
 pub struct Committee(usize);
 
-pub struct Committees<TxId: Eq + Hash, const C: usize> {
+pub struct Committees<const C: usize> {
     nodes: Box<[NodeId]>,
-    _marker: std::marker::PhantomData<TxId>,
 }
 
-impl<TxId: Eq + Hash, const C: usize> Committees<TxId, C> {
+impl<const C: usize> Committees<C> {
     pub fn new(view: &View) -> Self {
         let mut nodes = view.staking_keys.keys().cloned().collect::<Box<[NodeId]>>();
         let mut rng = rand_chacha::ChaCha20Rng::from_seed(view.seed);
         nodes.shuffle(&mut rng);
-        Self {
+        Self { nodes }
-            nodes,
-            _marker: std::marker::PhantomData,
-        }
     }
 
-    pub fn into_member(self, id: NodeId, view: &View) -> Option<Member<TxId, C>> {
+    pub fn into_member(self, id: NodeId, view: &View) -> Option<Member<C>> {
         let member_idx = self.nodes.iter().position(|m| m == &id)?;
         Some(Member {
             committee: Committee(member_idx / C),
             committees: self,
             id,
             view_n: view.view_n,
-            _marker: std::marker::PhantomData,
         })
     }
 
@@ -92,7 +86,7 @@ impl Committee {
     }
 }
 
-impl<TxId: Eq + Hash, const C: usize> Member<TxId, C> {
+impl<const C: usize> Member<C> {
     /// Return other members of this committee
     pub fn peers(&self) -> &[NodeId] {
         self.committees
@@ -117,15 +111,14 @@ impl<TxId: Eq + Hash, const C: usize> Member<TxId, C> {
 }
 
 #[async_trait::async_trait]
-impl<Network, Fountain, VoteTally, TxId, const C: usize> Overlay<Network, Fountain, VoteTally>
+impl<Network, Fountain, VoteTally, TxId, const C: usize> Overlay<Network, Fountain, VoteTally, TxId>
-    for Member<TxId, C>
+    for Member<C>
 where
     Network: NetworkAdapter + Sync,
     Fountain: FountainCode + Sync,
     VoteTally: Tally + Sync,
-    TxId: serde::de::DeserializeOwned + Eq + Hash + Clone + Send + Sync + 'static,
+    TxId: serde::de::DeserializeOwned + Clone + Hash + Eq + Send + Sync + 'static,
 {
-    type TxId = TxId;
     // we still need view here to help us initialize
     fn new(view: &View, node: NodeId) -> Self {
         let committees = Committees::new(view);
@@ -137,13 +130,13 @@ where
         view: &View,
         adapter: &Network,
         fountain: &Fountain,
-    ) -> Result<Block<Self::TxId>, FountainError> {
+    ) -> Result<Block<TxId>, FountainError> {
         assert_eq!(view.view_n, self.view_n, "view_n mismatch");
         let committee = self.committee;
         let message_stream = adapter.proposal_chunks_stream(committee, view).await;
         fountain.decode(message_stream).await.and_then(|b| {
             deserializer(&b)
-                .deserialize::<Block<Self::TxId>>()
+                .deserialize::<Block<TxId>>()
                 .map_err(|e| FountainError::from(e.to_string().as_str()))
         })
     }
@@ -151,7 +144,7 @@ where
     async fn broadcast_block(
         &self,
         view: &View,
-        block: Block<Self::TxId>,
+        block: Block<TxId>,
         adapter: &Network,
         fountain: &Fountain,
     ) {
@@ -180,7 +173,7 @@ where
     async fn approve_and_forward(
         &self,
         view: &View,
-        _block: &Block<Self::TxId>,
+        _block: &Block<TxId>,
         _adapter: &Network,
         _tally: &VoteTally,
         _next_view: &View,

nomos-services/consensus/src/overlay/flat.rs

@@ -25,7 +25,7 @@ pub struct Flat<TxId> {
     _marker: std::marker::PhantomData<TxId>,
 }
 
-impl<TxId: Eq + Hash> Flat<TxId> {
+impl<TxId: Clone + Eq + Hash> Flat<TxId> {
     pub fn new(view_n: u64, node_id: NodeId) -> Self {
         Self {
             node_id,
@@ -41,7 +41,7 @@ impl<TxId: Eq + Hash> Flat<TxId> {
 }
 
 #[async_trait::async_trait]
-impl<Network, Fountain, VoteTally, TxId> Overlay<Network, Fountain, VoteTally> for Flat<TxId>
+impl<Network, Fountain, VoteTally, TxId> Overlay<Network, Fountain, VoteTally, TxId> for Flat<TxId>
 where
     TxId: serde::de::DeserializeOwned + Clone + Eq + Hash + Send + Sync + 'static,
     Network: NetworkAdapter + Sync,
@@ -49,8 +49,6 @@ where
     VoteTally: Tally + Sync,
     VoteTally::Vote: Serialize + DeserializeOwned + Send,
 {
-    type TxId = TxId;
-
     fn new(view: &View, node: NodeId) -> Self {
         Flat::new(view.view_n, node)
     }
@@ -60,12 +58,12 @@ where
         view: &View,
         adapter: &Network,
         fountain: &Fountain,
-    ) -> Result<Block<Self::TxId>, FountainError> {
+    ) -> Result<Block<TxId>, FountainError> {
         assert_eq!(view.view_n, self.view_n, "view_n mismatch");
         let message_stream = adapter.proposal_chunks_stream(FLAT_COMMITTEE, view).await;
         fountain.decode(message_stream).await.and_then(|b| {
             deserializer(&b)
-                .deserialize::<Block<Self::TxId>>()
+                .deserialize::<Block<TxId>>()
                 .map_err(|e| FountainError::from(e.to_string().as_str()))
         })
     }
@@ -73,7 +71,7 @@ where
     async fn broadcast_block(
         &self,
         view: &View,
-        block: Block<Self::TxId>,
+        block: Block<TxId>,
         adapter: &Network,
         fountain: &Fountain,
     ) {
@@ -93,7 +91,7 @@ where
     async fn approve_and_forward(
         &self,
         view: &View,
-        block: &Block<Self::TxId>,
+        block: &Block<TxId>,
         adapter: &Network,
         _tally: &VoteTally,
         _next_view: &View,

nomos-services/consensus/src/overlay/mod.rs

@@ -3,6 +3,7 @@ mod flat;
 
 // std
 use std::error::Error;
+use std::hash::Hash;
 // crates
 // internal
 use super::{Approval, NodeId, View};
@@ -14,9 +15,13 @@ use nomos_core::vote::Tally;
 
 /// Dissemination overlay, tied to a specific view
 #[async_trait::async_trait]
-pub trait Overlay<Network: NetworkAdapter, Fountain: FountainCode, VoteTally: Tally> {
+pub trait Overlay<
-    type TxId: serde::de::DeserializeOwned + Clone + Eq + core::hash::Hash + Send + Sync + 'static;
+    Network: NetworkAdapter,
-
+    Fountain: FountainCode,
+    VoteTally: Tally,
+    TxId: Clone + Eq + Hash,
+>
+{
     fn new(view: &View, node: NodeId) -> Self;
 
     async fn reconstruct_proposal_block(
@@ -24,11 +29,11 @@ pub trait Overlay<Network: NetworkAdapter, Fountain: FountainCode, VoteTally: Ta
         view: &View,
         adapter: &Network,
         fountain: &Fountain,
-    ) -> Result<Block<Self::TxId>, FountainError>;
+    ) -> Result<Block<TxId>, FountainError>;
     async fn broadcast_block(
         &self,
         view: &View,
-        block: Block<Self::TxId>,
+        block: Block<TxId>,
         adapter: &Network,
         fountain: &Fountain,
     );
@@ -38,7 +43,7 @@ pub trait Overlay<Network: NetworkAdapter, Fountain: FountainCode, VoteTally: Ta
     async fn approve_and_forward(
         &self,
         view: &View,
-        block: &Block<Self::TxId>,
+        block: &Block<TxId>,
         adapter: &Network,
         vote_tally: &VoteTally,
         next_view: &View,

nomos-services/mempool/src/backend/mockpool.rs

@@ -7,19 +7,20 @@ use std::{collections::BTreeMap, time::UNIX_EPOCH};
 // internal
 use crate::backend::{MemPool, MempoolError};
 use nomos_core::block::{BlockHeader, BlockId};
+use nomos_core::tx::Transaction;
 
 /// A mock mempool implementation that stores all transactions in memory in the order received.
-pub struct MockPool<Id, Tx> {
+pub struct MockPool<Tx: Transaction>
-    pending_txs: LinkedHashMap<Id, Tx>,
+where
+    Tx::Hash: Hash,
+{
+    pending_txs: LinkedHashMap<Tx::Hash, Tx>,
     in_block_txs: BTreeMap<BlockId, Vec<Tx>>,
-    in_block_txs_by_id: BTreeMap<Id, BlockId>,
+    in_block_txs_by_id: BTreeMap<Tx::Hash, BlockId>,
     last_tx_timestamp: u64,
 }
 
-impl<Id, Tx> Default for MockPool<Id, Tx>
+impl<Tx: Transaction> Default for MockPool<Tx> {
-where
-    Id: Eq + Hash,
-{
     fn default() -> Self {
         Self {
             pending_txs: LinkedHashMap::new(),
@@ -30,30 +31,29 @@ where
     }
 }
 
-impl<Id, Tx> MockPool<Id, Tx>
+impl<Tx: Transaction> MockPool<Tx>
 where
-    Id: Eq + Hash,
+    Tx::Hash: Ord,
 {
     pub fn new() -> Self {
         Default::default()
     }
 }
 
-impl<Id, Tx> MemPool for MockPool<Id, Tx>
+impl<Tx> MemPool for MockPool<Tx>
 where
-    Id: for<'t> From<&'t Tx> + PartialOrd + Ord + Eq + Hash + Clone,
+    Tx: Transaction + Clone + Send + Sync + 'static + Hash,
-    Tx: Clone + Send + Sync + 'static + Hash,
+    Tx::Hash: Ord,
 {
     type Settings = ();
     type Tx = Tx;
-    type Id = Id;
 
     fn new(_settings: Self::Settings) -> Self {
         Self::new()
     }
 
     fn add_tx(&mut self, tx: Self::Tx) -> Result<(), MempoolError> {
-        let id = Id::from(&tx);
+        let id = <Self::Tx as Transaction>::hash(&tx);
         if self.pending_txs.contains_key(&id) || self.in_block_txs_by_id.contains_key(&id) {
             return Err(MempoolError::ExistingTx);
         }
@@ -73,7 +73,7 @@ where
         Box::new(pending_txs.into_iter())
     }
 
-    fn mark_in_block(&mut self, txs: &[Self::Id], block: BlockHeader) {
+    fn mark_in_block(&mut self, txs: &[<Self::Tx as Transaction>::Hash], block: BlockHeader) {
         let mut txs_in_block = Vec::with_capacity(txs.len());
         for tx_id in txs.iter() {
             if let Some(tx) = self.pending_txs.remove(tx_id) {
@@ -96,7 +96,7 @@ where
         })
     }
 
-    fn prune(&mut self, txs: &[Self::Id]) {
+    fn prune(&mut self, txs: &[<Self::Tx as Transaction>::Hash]) {
         for tx_id in txs {
             self.pending_txs.remove(tx_id);
         }

nomos-services/mempool/src/backend/mod.rs

@@ -2,6 +2,7 @@
 pub mod mockpool;
 
 use nomos_core::block::{BlockHeader, BlockId};
+use nomos_core::tx::Transaction;
 
 #[derive(thiserror::Error, Debug)]
 pub enum MempoolError {
@@ -13,8 +14,7 @@ pub enum MempoolError {
 
 pub trait MemPool {
     type Settings: Clone;
-    type Tx;
+    type Tx: Transaction;
-    type Id;
 
     /// Construct a new empty pool
     fn new(settings: Self::Settings) -> Self;
@@ -30,7 +30,7 @@ pub trait MemPool {
     fn view(&self, ancestor_hint: BlockId) -> Box<dyn Iterator<Item = Self::Tx> + Send>;
 
     /// Record that a set of transactions were included in a block
-    fn mark_in_block(&mut self, txs: &[Self::Id], block: BlockHeader);
+    fn mark_in_block(&mut self, txs: &[<Self::Tx as Transaction>::Hash], block: BlockHeader);
 
     /// Returns all of the transactions for the block
     #[cfg(test)]
@@ -41,7 +41,7 @@ pub trait MemPool {
 
     /// Signal that a set of transactions can't be possibly requested anymore and can be
     /// discarded.
-    fn prune(&mut self, txs: &[Self::Id]);
+    fn prune(&mut self, txs: &[<Self::Tx as Transaction>::Hash]);
 
     fn pending_tx_count(&self) -> usize;
     fn last_tx_timestamp(&self) -> u64;

nomos-services/mempool/src/lib.rs

@@ -11,6 +11,7 @@ use tokio::sync::oneshot::Sender;
 use crate::network::NetworkAdapter;
 use backend::MemPool;
 use nomos_core::block::{BlockHeader, BlockId};
+use nomos_core::tx::Transaction;
 use nomos_network::NetworkService;
 use overwatch_rs::services::{
     handle::ServiceStateHandle,
@@ -25,7 +26,7 @@ where
     P: MemPool,
     P::Settings: Clone,
     P::Tx: Debug + 'static,
-    P::Id: Debug + 'static,
+    <P::Tx as Transaction>::Hash: Debug,
 {
     service_state: ServiceStateHandle<Self>,
     network_relay: Relay<NetworkService<N::Backend>>,
@@ -37,7 +38,7 @@ pub struct MempoolMetrics {
     pub last_tx_timestamp: u64,
 }
 
-pub enum MempoolMsg<Tx, Id> {
+pub enum MempoolMsg<Tx: Transaction> {
     AddTx {
         tx: Tx,
         reply_channel: Sender<Result<(), ()>>,
@@ -47,7 +48,7 @@ pub enum MempoolMsg<Tx, Id> {
         reply_channel: Sender<Box<dyn Iterator<Item = Tx> + Send>>,
     },
     Prune {
-        ids: Vec<Id>,
+        ids: Vec<Tx::Hash>,
     },
     #[cfg(test)]
     BlockTransaction {
@@ -55,7 +56,7 @@ pub enum MempoolMsg<Tx, Id> {
         reply_channel: Sender<Option<Box<dyn Iterator<Item = Tx> + Send>>>,
     },
     MarkInBlock {
-        ids: Vec<Id>,
+        ids: Vec<Tx::Hash>,
         block: BlockHeader,
     },
     Metrics {
@@ -63,7 +64,10 @@ pub enum MempoolMsg<Tx, Id> {
     },
 }
 
-impl<Tx: Debug, Id: Debug> Debug for MempoolMsg<Tx, Id> {
+impl<Tx: Transaction + Debug> Debug for MempoolMsg<Tx>
+where
+    Tx::Hash: Debug,
+{
     fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error> {
         match self {
             Self::View { ancestor_hint, .. } => {
@@ -86,7 +90,7 @@ impl<Tx: Debug, Id: Debug> Debug for MempoolMsg<Tx, Id> {
     }
 }
 
-impl<Tx: 'static, Id: 'static> RelayMessage for MempoolMsg<Tx, Id> {}
+impl<Tx: Transaction + 'static> RelayMessage for MempoolMsg<Tx> {}
 
 impl<N, P> ServiceData for MempoolService<N, P>
 where
@@ -94,13 +98,13 @@ where
     P: MemPool,
     P::Settings: Clone,
     P::Tx: Debug + 'static,
-    P::Id: Debug + 'static,
+    <P::Tx as Transaction>::Hash: Debug,
 {
     const SERVICE_ID: ServiceId = "Mempool";
     type Settings = P::Settings;
     type State = NoState<Self::Settings>;
     type StateOperator = NoOperator<Self::State>;
-    type Message = MempoolMsg<<P as MemPool>::Tx, <P as MemPool>::Id>;
+    type Message = MempoolMsg<<P as MemPool>::Tx>;
 }
 
 #[async_trait::async_trait]
@@ -108,8 +112,8 @@ impl<N, P> ServiceCore for MempoolService<N, P>
 where
     P: MemPool + Send + 'static,
     P::Settings: Clone + Send + Sync + 'static,
-    P::Id: Debug + Send + 'static,
+    P::Tx: Transaction + Clone + Debug + Send + Sync + 'static,
-    P::Tx: Clone + Debug + Send + Sync + 'static,
+    <P::Tx as Transaction>::Hash: Debug + Send + Sync + 'static,
     N: NetworkAdapter<Tx = P::Tx> + Send + Sync + 'static,
 {
     fn init(service_state: ServiceStateHandle<Self>) -> Result<Self, overwatch_rs::DynError> {

nomos-services/mempool/tests/mock.rs

@@ -1,7 +1,4 @@
-use nomos_core::{
+use nomos_core::{block::BlockId, tx::mock::MockTransaction};
-    block::BlockId,
-    tx::mock::{MockTransaction, MockTxId},
-};
 use nomos_log::{Logger, LoggerSettings};
 use nomos_network::{
     backends::mock::{Mock, MockBackendMessage, MockConfig, MockMessage},
@@ -20,7 +17,7 @@ use nomos_mempool::{
 struct MockPoolNode {
     logging: ServiceHandle<Logger>,
     network: ServiceHandle<NetworkService<Mock>>,
-    mockpool: ServiceHandle<MempoolService<MockAdapter, MockPool<MockTxId, MockTransaction>>>,
+    mockpool: ServiceHandle<MempoolService<MockAdapter, MockPool<MockTransaction>>>,
 }
 
 #[test]
@@ -70,7 +67,7 @@ fn test_mockmempool() {
     let network = app.handle().relay::<NetworkService<Mock>>();
     let mempool = app
         .handle()
-        .relay::<MempoolService<MockAdapter, MockPool<MockTxId, MockTransaction>>>();
+        .relay::<MempoolService<MockAdapter, MockPool<MockTransaction>>>();
 
     app.spawn(async move {
         let network_outbound = network.connect().await.unwrap();