feat: Encodable2718::network_len (#1431)

* feat: Encodable2718::network_len

* clippy

crates/consensus/src/receipt/envelope.rs

@@ -1,7 +1,7 @@
 use crate::{Eip658Value, Receipt, ReceiptWithBloom, TxReceipt, TxType};
 use alloy_eips::eip2718::{Decodable2718, Eip2718Error, Eip2718Result, Encodable2718};
 use alloy_primitives::{Bloom, Log};
-use alloy_rlp::{length_of_length, BufMut, Decodable, Encodable};
+use alloy_rlp::{BufMut, Decodable, Encodable};
 
 /// Receipt envelope, as defined in [EIP-2718].
 ///
@@ -158,11 +158,7 @@ impl Encodable for ReceiptEnvelope {
     }
 
     fn length(&self) -> usize {
-        let mut payload_length = self.rlp_payload_length();
-        if !self.is_legacy() {
-            payload_length += length_of_length(payload_length);
-        }
-        payload_length
+        self.network_len()
     }
 }
 

crates/consensus/src/transaction/envelope.rs

@@ -305,12 +305,7 @@ impl Encodable for TxEnvelope {
     }
 
     fn length(&self) -> usize {
-        let mut payload_length = self.rlp_payload_length();
-        if !self.is_legacy() {
-            payload_length += Header { list: false, payload_length }.length();
-        }
-
-        payload_length
+        self.network_len()
     }
 }
 

crates/eips/src/eip2718.rs

@@ -229,6 +229,17 @@ pub trait Encodable2718: Sized + Send + Sync + 'static {
         Sealed::new_unchecked(self, hash)
     }
 
+    /// The length of the 2718 encoded envelope in network format. This is the length of the header
+    /// + the length of the type flag and inner encoding.
+    fn network_len(&self) -> usize {
+        let mut payload_length = self.encode_2718_len();
+        if !self.is_legacy() {
+            payload_length += Header { list: false, payload_length }.length();
+        }
+
+        payload_length
+    }
+
     /// Encode in the network format. The network format is used ONLY by the
     /// Ethereum p2p protocol. Do not call this method unless you are building
     /// a p2p protocol client.