131 lines
2.8 KiB
Go
131 lines
2.8 KiB
Go
package main
|
|
|
|
//------------------------------------------------------------------------------
|
|
//
|
|
// Commands
|
|
//
|
|
//------------------------------------------------------------------------------
|
|
|
|
import (
|
|
"encoding/json"
|
|
"github.com/xiangli-cmu/go-raft"
|
|
"github.com/xiangli-cmu/raft-etcd/store"
|
|
"time"
|
|
)
|
|
|
|
// A command represents an action to be taken on the replicated state machine.
|
|
type Command interface {
|
|
CommandName() string
|
|
Apply(server *raft.Server) (interface{}, error)
|
|
}
|
|
|
|
// Set command
|
|
type SetCommand struct {
|
|
Key string `json:"key"`
|
|
Value string `json:"value"`
|
|
ExpireTime time.Time `json:"expireTime"`
|
|
}
|
|
|
|
// The name of the command in the log
|
|
func (c *SetCommand) CommandName() string {
|
|
return "set"
|
|
}
|
|
|
|
// Set the value of key to value
|
|
func (c *SetCommand) Apply(server *raft.Server) (interface{}, error) {
|
|
return store.Set(c.Key, c.Value, c.ExpireTime, server.CommittedIndex())
|
|
}
|
|
|
|
// Get the path for http request
|
|
func (c *SetCommand) GeneratePath() string {
|
|
return "set/" + c.Key
|
|
}
|
|
|
|
// Get command
|
|
type GetCommand struct {
|
|
Key string `json:"key"`
|
|
}
|
|
|
|
// The name of the command in the log
|
|
func (c *GetCommand) CommandName() string {
|
|
return "get"
|
|
}
|
|
|
|
// Set the value of key to value
|
|
func (c *GetCommand) Apply(server *raft.Server) (interface{}, error) {
|
|
res := store.Get(c.Key)
|
|
return json.Marshal(res)
|
|
}
|
|
|
|
func (c *GetCommand) GeneratePath() string {
|
|
return "get/" + c.Key
|
|
}
|
|
|
|
// List command
|
|
type ListCommand struct {
|
|
Prefix string `json:"prefix"`
|
|
}
|
|
|
|
// The name of the command in the log
|
|
func (c *ListCommand) CommandName() string {
|
|
return "list"
|
|
}
|
|
|
|
// Set the value of key to value
|
|
func (c *ListCommand) Apply(server *raft.Server) (interface{}, error) {
|
|
return store.List(c.Prefix)
|
|
}
|
|
|
|
// Delete command
|
|
type DeleteCommand struct {
|
|
Key string `json:"key"`
|
|
}
|
|
|
|
// The name of the command in the log
|
|
func (c *DeleteCommand) CommandName() string {
|
|
return "delete"
|
|
}
|
|
|
|
// Delete the key
|
|
func (c *DeleteCommand) Apply(server *raft.Server) (interface{}, error) {
|
|
return store.Delete(c.Key, server.CommittedIndex())
|
|
}
|
|
|
|
// Watch command
|
|
type WatchCommand struct {
|
|
Key string `json:"key"`
|
|
SinceIndex uint64 `json:"sinceIndex"`
|
|
}
|
|
|
|
//The name of the command in the log
|
|
func (c *WatchCommand) CommandName() string {
|
|
return "watch"
|
|
}
|
|
|
|
func (c *WatchCommand) Apply(server *raft.Server) (interface{}, error) {
|
|
ch := make(chan store.Response, 1)
|
|
|
|
// add to the watchers list
|
|
store.AddWatcher(c.Key, ch, c.SinceIndex)
|
|
|
|
// wait for the notification for any changing
|
|
res := <-ch
|
|
|
|
return json.Marshal(res)
|
|
}
|
|
|
|
// JoinCommand
|
|
type JoinCommand struct {
|
|
Name string `json:"name"`
|
|
}
|
|
|
|
func (c *JoinCommand) CommandName() string {
|
|
return "join"
|
|
}
|
|
|
|
func (c *JoinCommand) Apply(server *raft.Server) (interface{}, error) {
|
|
err := server.AddPeer(c.Name)
|
|
// no result will be returned
|
|
return nil, err
|
|
}
|