// ClientRequestSendMessages checks we are the leader and then queues the messages
// Results are only sent once the messages are on the queue
func (node *Node) ClientRequestSendMessages(args *rapi.SendMessagesArgs, results *rapi.SendMessagesResults) error {
//log.Printf("Starting request send message\n")
state := node.getState()
if state == SHUTDOWN_NODE {
results.Result = rapi.Get_RI_NODE_IN_SHUTDOWN(node.name)
return nil
} else if state != LEADER_NODE {
results.Result = rapi.Get_RI_NODE_NOT_LEADER(node.name, node.getLastSeenLeader())
return nil
}
//log.Printf("Sending to queue aggregator.\n")
//IDs, err := node.log.Queue(node.getTerm(), args.SentMessages)
IDs, err := node.writeAggregator.Queue(args.SentMessages)
//log.Printf("Got response from write aggregator\n")
results.IDs = IDs
if err == nil {
results.Result = rapi.Get_RI_SUCCESS()
if !args.WaitForCommit {
return nil
}
if len(IDs) > 0 {
// See if we are waiting on commit
waitForIndex := IDs[len(IDs)-1]
for node.getState() == LEADER_NODE {
if node.commitIndex.WaitOnCommitChange(waitForIndex) >= waitForIndex {
return nil
}
}
// If we get here then we are no longer the leader - return an error
results.Result = rapi.Get_RI_NODE_NOT_LEADER(node.name, node.getLastSeenLeader())
}
}
return err
}
/*
SendMessages is a Client RPC method allowing clients to send new messages to a topic on the leader node.
*/
func (handler *RPCHandler) SendMessages(args *rapi.SendMessagesArgs, results *rapi.SendMessagesResults) error {
node := handler.server.GetNode(args.Topic)
if node != nil {
return node.ClientRequestSendMessages(args, results)
} else {
results.Result = rapi.Get_RI_TOPIC_NOT_FOUND(handler.server.address, args.Topic)
return nil
}
}