feat: check version of catchup response (#126)

Description
---
Check the version of catchup response on receive and drop if the
response is too old

src/server/p2p/messages.rs

@@ -264,6 +264,10 @@ impl ShareChainSyncResponse {
         }
     }
 
+    pub fn version(&self) -> u64 {
+        self.version
+    }
+
     pub fn peer_id(&self) -> &PeerId {
         &self.peer_id
     }

src/server/p2p/network.rs

@@ -23,12 +23,11 @@ use libp2p::{
     autonat::{self, NatStatus},
     dcutr,
     futures::StreamExt,
-    gossipsub::{self, IdentTopic, Message, MessageAcceptance, MessageId, PublishError},
+    gossipsub::{self, IdentTopic, Message, MessageAcceptance, PublishError},
     identify::{self, Info},
     identity::Keypair,
     kad::{self, store::MemoryStore, Event},
     mdns::{self, tokio::Tokio},
-    memory_connection_limits,
     multiaddr::Protocol,
     noise,
     relay,
@@ -867,6 +866,10 @@ where S: ShareChain
         debug!(target: MESSAGE_LOGGING_LOG_TARGET, "Share chain sync response: {response:?}");
         let peer = response.peer_id().clone();
 
+        if response.version() != PROTOCOL_VERSION {
+            trace!(target: LOG_TARGET, squad = &self.config.squad; "Peer {} has an outdated version, skipping", peer);
+            return;
+        }
         let timer = Instant::now();
         // if !self.sync_in_progress.load(Ordering::SeqCst) {
         // return;

src/sharechain/in_memory.rs

@@ -595,15 +595,15 @@ impl ShareChain for InMemoryShareChain {
 
         // Assume their blocks are in order highest first.
         let mut split_height = 0;
-        let mut split_found = false;
+        // let mut split_found = false;
 
         if let Some(last_block_received) = last_block_received {
             if let Some(level) = p2_chain_read.level_at_height(last_block_received.0) {
                 if let Some(block) = level.blocks.get(&last_block_received.1) {
                     // Only split if the block is in the main chain
                     if level.chain_block == block.hash {
                         split_height = block.height;
-                        split_found = true;
+                        // split_found = true;
                     }
                 }
             }

src/sharechain/mod.rs

@@ -57,8 +57,6 @@ pub const BLOCK_TARGET_TIME: u64 = 10;
 pub const MIN_RANDOMX_SCALING_FACTOR: u64 = 1;
 pub const MIN_SHA3X_SCALING_FACTOR: u64 = 1;
 
-pub const MAX_BLOCKS_PER_INITIAL_SYNC: usize = 20;
-
 pub mod error;
 pub mod in_memory;
 pub mod p2block;