Refactor commands.

command/test_and_set_command.go

@@ -0,0 +1,38 @@
+package command
+
+import (
+	"time"
+
+	"github.com/coreos/etcd/log"
+	"github.com/coreos/etcd/store"
+	"github.com/coreos/go-raft"
+)
+
+// The TestAndSetCommand performs a conditional update on a key in the store.
+type TestAndSetCommand struct {
+	Key        string    `json:"key"`
+	Value      string    `json:"value"`
+	ExpireTime time.Time `json:"expireTime"`
+	PrevValue  string    `json: prevValue`
+	PrevIndex  uint64    `json: prevIndex`
+}
+
+// The name of the testAndSet command in the log
+func (c *TestAndSetCommand) CommandName() string {
+	return "etcd:testAndSet"
+}
+
+// Set the key-value pair if the current value of the key equals to the given prevValue
+func (c *TestAndSetCommand) Apply(server *raft.Server) (interface{}, error) {
+	s, _ := server.StateMachine().(*store.Store)
+
+	e, err := s.TestAndSet(c.Key, c.PrevValue, c.PrevIndex,
+		c.Value, c.ExpireTime, server.CommitIndex(), server.Term())
+
+	if err != nil {
+		log.Debug(err)
+		return nil, err
+	}
+
+	return e, nil
+}