check vote

grpc-server.go

@@ -740,7 +740,9 @@ func (multi *MultiEpoch) processSlotTransactions(
 			return true
 		}
 
-		// add Vote
+		if !(*filter.Vote) && IsSimpleVoteTransaction(&tx) { // If vote is false, we should filter out vote transactions
+			return false
+		}
 
 		if !(*filter.Failed) { // If failed is false, we should filter out failed transactions
 			err := getErr(meta)

vote.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"github.com/gagliardetto/solana-go"
+)
+
+// IsSimpleVoteTransaction checks if a transaction is a simple vote transaction.
+// A simple vote transaction meets these conditions:
+// 1. has 1 or 2 signatures
+// 2. is legacy message (this is implicit in solana-go as it mainly handles legacy messages)
+// 3. has only one instruction
+// 4. which must be Vote instruction
+func IsSimpleVoteTransaction(tx *solana.Transaction) bool {
+    // Check signature count (condition 1)
+    if len(tx.Signatures) == 0 || len(tx.Signatures) > 2 {
+        return false
+    }
+
+    // Check instruction count (condition 3)
+    instructions := tx.Message.Instructions
+    if len(instructions) != 1 {
+        return false
+    }
+
+    // Get the program ID for the instruction
+    programID := tx.Message.AccountKeys[instructions[0].ProgramIDIndex]
+
+    // Check if it's a Vote instruction (condition 4)
+    // Note: This is the Vote Program ID on Solana mainnet
+    voteProgram := solana.VoteProgramID // This is a built-in constant in solana-go
+
+    return programID.Equals(voteProgram)
+}