refactor: introduce dedicated ApplyTimeout constant for Raft operations

Replace usage of LeaderElectionTimeout with a new dedicated ApplyTimeout constant
(2 seconds) for Raft command applications across different load balancing
strategies (ConsistentHash, RoundRobin, WeightedRoundRobin).

This change provides better separation of concerns by using a more appropriate
timeout value for command applications rather than reusing the leader election
timeout.

network/consistenthash.go

@@ -84,7 +84,7 @@ func (ch *ConsistentHash) NextProxy(conn IConnWrapper) (IProxy, *gerr.GatewayDEr
 	}
 
 	// Apply the command through Raft
-	if err := ch.server.RaftNode.Apply(cmdBytes, raft.LeaderElectionTimeout); err != nil {
+	if err := ch.server.RaftNode.Apply(cmdBytes, raft.ApplyTimeout); err != nil {
 		return nil, gerr.ErrNoProxiesAvailable.Wrap(err)
 	}
 

network/roundrobin.go

@@ -52,7 +52,7 @@ func (r *RoundRobin) NextProxy(_ IConnWrapper) (IProxy, *gerr.GatewayDError) {
 	}
 
 	// Apply through Raft
-	if err := r.server.RaftNode.Apply(data, raft.LeaderElectionTimeout); err != nil {
+	if err := r.server.RaftNode.Apply(data, raft.ApplyTimeout); err != nil {
 		return nil, gerr.ErrNoProxiesAvailable.Wrap(err)
 	}
 

network/roundrobin_test.go

@@ -144,7 +144,7 @@ func TestNextProxyOverflow(t *testing.T) {
 	data, err := json.Marshal(cmd)
 	require.NoError(t, err)
 
-	require.NoError(t, raftHelper.Node.Apply(data, raft.LeaderElectionTimeout))
+	require.NoError(t, raftHelper.Node.Apply(data, raft.ApplyTimeout))
 
 	// Call NextProxy multiple times to trigger the overflow
 	for range 4 {

network/weightedroundrobin.go

@@ -107,7 +107,7 @@ func (r *WeightedRoundRobin) NextProxy(_ IConnWrapper) (IProxy, *gerr.GatewayDEr
 	if err != nil {
 		return nil, gerr.ErrNoProxiesAvailable.Wrap(err)
 	}
-	if err := r.raftNode.Apply(data, raft.LeaderElectionTimeout); err != nil {
+	if err := r.raftNode.Apply(data, raft.ApplyTimeout); err != nil {
 		return nil, gerr.ErrNoProxiesAvailable.Wrap(err)
 	}
 

raft/raft.go

@@ -33,6 +33,7 @@ const (
 	maxPool                       = 3                // Maximum number of connections to pool
 	transportTimeout              = 10 * time.Second // Timeout for transport operations
 	leadershipCheckInterval       = 10 * time.Second // Interval for checking leadership status
+	ApplyTimeout                  = 2 * time.Second  // Timeout for applying commands
 )
 
 // Command represents a general command structure for all operations.