/
NodeClientMethods.go
86 lines (78 loc) · 2.66 KB
/
NodeClientMethods.go
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package server
import (
"github.com/owlfish/forestbus/rapi"
)
// 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
}
// ClientReceiveMessages returns messages at and beyond ID
// If WaitForMessages is true and no messages are currently present, this method blocks
// until at least one message can be returned
func (node *Node) ClientReceiveMessages(args *rapi.ReceiveMessagesArgs, results *rapi.ReceiveMessagesResults) error {
state := node.getState()
if state == SHUTDOWN_NODE {
results.Result = rapi.Get_RI_NODE_IN_SHUTDOWN(node.name)
return nil
}
msgs, nextID, err := node.log.Get(args.ID, args.Quantity, args.WaitForMessages)
if err == nil {
results.Result = rapi.Get_RI_SUCCESS()
results.ReceivedMessages = msgs
results.NextID = nextID
}
return err
}
func (node *Node) GetTopicDetails(args *rapi.GetTopicDetailsArgs, results *rapi.GetTopicDetailsResults) error {
state := node.getState()
var err error
if state == SHUTDOWN_NODE {
results.Result = rapi.Get_RI_NODE_IN_SHUTDOWN(node.name)
return nil
}
results.FirstIndex, err = node.log.FirstIndex()
if err != nil {
results.Result = rapi.Get_RI_INTERNAL_ERROR(node.name, err.Error())
return nil
}
results.LastIndex, err = node.log.LastIndex()
if err != nil {
results.Result = rapi.Get_RI_INTERNAL_ERROR(node.name, err.Error())
return nil
}
results.CommitIndex = node.log.GetCurrentCommit()
results.Result = rapi.Get_RI_SUCCESS()
return nil
}