unify raft Role and Status

src/interface/raftex.thrift

@@ -11,8 +11,8 @@ enum Role {
     LEADER      = 1, // the leader
     FOLLOWER    = 2; // following a leader
     CANDIDATE   = 3; // Has sent AskForVote request
-    LEARNER     = 4; // It is the same with FOLLOWER,
-                     // except it does not participate in leader election
+    LEARNER     = 4; // same with FOLLOWER, except that it does
+                     // not vote in leader election
 }
 
 enum Status {

src/kvstore/raftex/RaftPart.cpp

@@ -1001,13 +1001,13 @@ bool RaftPart::prepareElectionRequest(cpp2::AskForVoteRequest& req,
 void RaftPart::getState(cpp2::GetStateResponse& resp) {
   std::lock_guard<std::mutex> g(raftLock_);
   resp.set_term(term_);
-  resp.set_role(nebula::raftex::cpp2::Role(role_));
+  resp.set_role(role_);
   resp.set_is_leader(role_ == Role::LEADER);
   resp.set_error_code(cpp2::ErrorCode::SUCCEEDED);
   resp.set_committed_log_id(committedLogId_);
   resp.set_last_log_id(lastLogId_);
   resp.set_last_log_term(lastLogTerm_);
-  resp.set_status(nebula::raftex::cpp2::Status(status_));
+  resp.set_status(status_);
 }
 
 typename RaftPart::Role RaftPart::processElectionResponses(

src/kvstore/raftex/RaftPart.h

@@ -238,20 +238,8 @@ class RaftPart : public std::enable_shared_from_this<RaftPart> {
            std::shared_ptr<thrift::ThriftClientManager<cpp2::RaftexServiceAsyncClient>> clientMan,
            std::shared_ptr<kvstore::DiskManager> diskMan);
 
-  enum class Status {
-    STARTING = 0,     // The part is starting, not ready for service
-    RUNNING,          // The part is running
-    STOPPED,          // The part has been stopped
-    WAITING_SNAPSHOT  // Waiting for the snapshot.
-  };
-
-  enum class Role {
-    LEADER = 1,  // the leader
-    FOLLOWER,    // following a leader
-    CANDIDATE,   // Has sent AskForVote request
-    LEARNER      // It is the same with FOLLOWER,
-                 // except it does not participate in leader election
-  };
+  using Status = cpp2::Status;
+  using Role = cpp2::Role;
 
   const char* idStr() const { return idStr_.c_str(); }