Rename bob::Message2 to Message4

As per sequence diagram.

swap/src/network/request_response.rs

@@ -1,4 +1,9 @@
-use crate::protocol::{alice, alice::TransferProof, bob, bob::EncryptedSignature};
+use crate::protocol::{
+    alice,
+    alice::TransferProof,
+    bob,
+    bob::{EncryptedSignature, Message4},
+};
 use async_trait::async_trait;
 use futures::prelude::*;
 use libp2p::{
@@ -23,7 +28,7 @@ pub enum BobToAlice {
     SwapRequest(Box<bob::SwapRequest>),
     Message0(Box<bob::Message0>),
     Message1(Box<bob::Message1>),
-    Message2(Box<bob::Message2>),
+    Message4(Box<Message4>),
 }
 
 /// Messages Alice sends to Bob.

swap/src/protocol/alice/execution_setup.rs

@@ -6,6 +6,7 @@ use crate::{
     protocol::{
         alice::{State0, State3},
         bob,
+        bob::Message4,
     },
 };
 use anyhow::{Context, Error, Result};
@@ -99,11 +100,11 @@ impl Behaviour {
                 }
 
                 let state3 = {
-                    let bob_message2 = serde_cbor::from_slice::<bob::Message2>(
+                    let message4 = serde_cbor::from_slice::<Message4>(
                         &substream.read_message(BUF_SIZE).await?,
                     )
-                    .context("failed to deserialize message2")?;
-                    state2.receive(bob_message2)?
+                    .context("failed to deserialize message4")?;
+                    state2.receive(message4)?
                 };
 
                 Ok(state3)

swap/src/protocol/alice/state.rs

@@ -7,7 +7,13 @@ use crate::{
         TxRefund, WatchForRawTransaction,
     },
     monero,
-    protocol::{alice, alice::TransferProof, bob, bob::EncryptedSignature, SwapAmounts},
+    protocol::{
+        alice,
+        alice::TransferProof,
+        bob,
+        bob::{EncryptedSignature, Message4},
+        SwapAmounts,
+    },
 };
 use anyhow::{anyhow, Context, Result};
 use ecdsa_fun::{adaptor::Adaptor, nonce::Deterministic};
@@ -250,7 +256,7 @@ impl State2 {
         }
     }
 
-    pub fn receive(self, msg: bob::Message2) -> Result<State3> {
+    pub fn receive(self, msg: Message4) -> Result<State3> {
         let tx_cancel =
             bitcoin::TxCancel::new(&self.tx_lock, self.cancel_timelock, self.a.public(), self.B);
         bitcoin::verify_sig(&self.B, &tx_cancel.digest(), &msg.tx_cancel_sig)

swap/src/protocol/bob.rs

@@ -26,7 +26,7 @@ pub use self::{
     swap::{run, run_until},
     swap_request::*,
 };
-pub use execution_setup::{Message0, Message1, Message2};
+pub use execution_setup::{Message0, Message1, Message4};
 
 mod encrypted_signature;
 pub mod event_loop;

swap/src/protocol/bob/execution_setup.rs

@@ -28,7 +28,7 @@ pub struct Message1 {
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize)]
-pub struct Message2 {
+pub struct Message4 {
     pub(crate) tx_punish_sig: Signature,
     pub(crate) tx_cancel_sig: Signature,
 }
@@ -105,11 +105,11 @@ impl Behaviour {
                 let state2 = state1.receive(alice_message1)?;
 
                 {
-                    let bob_message2 = state2.next_message();
+                    let message4 = state2.next_message();
                     substream
                         .write_message(
-                            &serde_cbor::to_vec(&bob_message2)
-                                .context("failed to serialize Message2")?,
+                            &serde_cbor::to_vec(&message4)
+                                .context("failed to serialize message4")?,
                         )
                         .await?;
                 }

swap/src/protocol/bob/state.rs

@@ -9,7 +9,11 @@ use crate::{
     execution_params::ExecutionParams,
     monero,
     monero::{monero_private_key, TransferProof},
-    protocol::{alice, bob, bob::EncryptedSignature, SwapAmounts},
+    protocol::{
+        alice, bob,
+        bob::{EncryptedSignature, Message4},
+        SwapAmounts,
+    },
 };
 use anyhow::{anyhow, Result};
 use ecdsa_fun::{adaptor::Adaptor, nonce::Deterministic, Signature};
@@ -246,14 +250,14 @@ pub struct State2 {
 }
 
 impl State2 {
-    pub fn next_message(&self) -> bob::Message2 {
+    pub fn next_message(&self) -> Message4 {
         let tx_cancel = TxCancel::new(&self.tx_lock, self.cancel_timelock, self.A, self.b.public());
         let tx_cancel_sig = self.b.sign(tx_cancel.digest());
         let tx_punish =
             bitcoin::TxPunish::new(&tx_cancel, &self.punish_address, self.punish_timelock);
         let tx_punish_sig = self.b.sign(tx_punish.digest());
 
-        bob::Message2 {
+        Message4 {
             tx_punish_sig,
             tx_cancel_sig,
         }