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msg.go
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msg.go
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package main
import "encoding/json"
const (
// sponsoring-node
JoinRing = "join-ring"
// mode {immediate, orderly}
LeaveRing = "leave-ring"
InitRingFingers = "init-ring-fingers"
StabilizeRing = "stabilize-ring"
FixRingFingers = "fix-ring-fingers"
// reply-to
RingNotify = "ring-notify"
GetRingFingers = "get-ring-fingers"
FindRingSuccessor = "find-ring-successor"
FindRingPredecessor = "find-ring-predecessor"
// data {key, value}
Put = "put"
PutKeyVal = "put-key-val"
Get = "get"
GetVal = "get-val"
Remove = "remove"
RemoveKey = "remove-key"
ListItems = "list-items"
)
const (
DoKey = "do"
ID = "id"
SponsoringNodeKey = "sponsoring-node"
ReplyToKey = "reply-to"
DataKey = "data"
ModeKey = "mode"
ReplyKey = "reply"
Value = "Value"
)
const (
ImmediateMode = "immediate"
OrderlyMode = "orderly"
)
type msg struct {
content map[string]interface{}
}
func newMsg() *msg {
return &msg{make(map[string]interface{})}
}
func (m *msg) Marshal() ([]byte, error) {
return json.Marshal(m.content)
}
func (m *msg) Unmarshal(data []byte) (map[string]interface{}, error) {
var content map[string]interface{}
err := json.Unmarshal(data, &content)
return content, err
}
func (m *msg) Add(key string, value interface{}) *msg {
m.content[key] = value
return m
}
func (m *msg) Get(key string) interface{} {
return m.content[key]
}
func joinRingMsg(sponsoringNode string) *msg {
msg := newMsg()
msg.Add(DoKey, JoinRing)
msg.Add(SponsoringNodeKey, sponsoringNode)
return msg
}
func leaveRingMsg(mode string) *msg {
msg := newMsg()
msg.Add(DoKey, LeaveRing)
msg.Add(ModeKey, mode)
return msg
}
func initRingFingersMsg() *msg {
msg := newMsg()
msg.Add(DoKey, InitRingFingers)
return msg
}
func fixRingFingersMsg() *msg {
msg := newMsg()
msg.Add(DoKey, FixRingFingers)
return msg
}
func ringNotifyMsg(address string) *msg {
msg := newMsg()
msg.Add(DoKey, RingNotify)
msg.Add(ReplyToKey, address)
return msg
}
func getRingFingersMsg(replyTo string) *msg {
msg := newMsg()
msg.Add(DoKey, GetRingFingers)
msg.Add(ReplyToKey, replyTo)
return msg
}
func findRingSuccessorMsg(replyTo string, id string) *msg {
msg := newMsg()
msg.Add(DoKey, FindRingSuccessor)
msg.Add(ID, id)
msg.Add(ReplyToKey, replyTo)
return msg
}
func findRingPredecessorMsg(replyTo string) *msg {
msg := newMsg()
msg.Add(DoKey, FindRingPredecessor)
msg.Add(ReplyToKey, replyTo)
return msg
}
func listItemsMsg(replyTo string) *msg {
msg := newMsg()
msg.Add(DoKey, ListItems)
msg.Add(ReplyToKey, replyTo)
return msg
}