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follower_server.go
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/
follower_server.go
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package graft
type FollowerServer struct {
LeaderServer
}
func (server *Server) ReceiveAppendEntries(message AppendEntriesMessage) (AppendEntriesResponseMessage, error) {
defer server.Persist()
server.stepDown()
if server.Term < message.Term {
server.Term = message.Term
}
if server.Term > message.Term || server.invalidLog(message) {
return AppendEntriesResponseMessage{
Success: false,
}, nil
}
server.ElectionTimer.Reset()
server.updateLog(message.PrevLogIndex, message.Entries)
if message.CommitIndex > 0 {
server.commitTo(message.CommitIndex)
}
return AppendEntriesResponseMessage{
Success: true,
}, nil
}
func (server *Server) commitTo(i int) {
for i > server.CommitIndex {
server.StateMachine.Commit(server.Log[server.CommitIndex].Data)
server.CommitIndex++
}
}
func (server *Server) updateLog(prevLogIndex int, entries []LogEntry) {
if len(server.Log) == 0 {
server.Log = entries
} else {
for i, entry := range entries {
if i+prevLogIndex >= len(server.Log) {
server.Log = append(server.Log, entry)
} else {
server.Log[i+prevLogIndex] = entry
}
}
}
}