Return complete meta information of HEAD.

Signed-off-by: Tao He <sighingnow@gmail.com>

etcd/Response.hpp

@@ -171,6 +171,21 @@ namespace etcd
      */
     std::chrono::microseconds const & duration() const;
 
+    /**
+     * Returns the current cluster id.
+     */
+    uint64_t cluster_id() const;
+
+    /**
+     * Returns the current member id.
+     */
+    uint64_t member_id() const;
+
+    /**
+     * Returns ther current raft term.
+     */
+    uint64_t raft_term() const;
+
   protected:
     Response(const etcdv3::V3Response& response, std::chrono::microseconds const& duration);
     Response(int error_code, char const * error_message);
@@ -190,6 +205,10 @@ namespace etcd
     // execute duration (in microseconds), during the action created and response parsed
     std::chrono::microseconds _duration;
 
+    uint64_t    _cluster_id;
+    uint64_t    _member_id;
+    uint64_t    _raft_term;
+
     friend class Client;
     friend class SyncClient;
     friend class etcdv3::AsyncWatchAction;

etcd/v3/V3Response.hpp

@@ -31,6 +31,9 @@ namespace etcdv3
     void set_name(std::string const &name);
     std::string const &get_name() const;
     std::vector<mvccpb::Event> const & get_events() const;
+    uint64_t get_cluster_id() const;
+    uint64_t get_member_id() const;
+    uint64_t get_raft_term() const;
   protected:
     int error_code;
     int64_t index;
@@ -44,6 +47,9 @@ namespace etcdv3
     std::string lock_key; // for lock
     std::string name;  // for campaign (in v3election)
     std::vector<mvccpb::Event> events; // for watch
+    uint64_t cluster_id;
+    uint64_t member_id;
+    uint64_t raft_term;
   };
 }
 #endif

src/Response.cpp

@@ -34,6 +34,11 @@ etcd::Response::Response(const etcdv3::V3Response& reply, std::chrono::microseco
 
   // duration
   _duration = duration;
+
+  // etcd head
+  _cluster_id = reply.get_cluster_id();
+  _member_id = reply.get_member_id();
+  _raft_term = reply.get_raft_term();
 }
 
 
@@ -130,3 +135,15 @@ std::vector<etcd::Event> const & etcd::Response::events() const {
 std::chrono::microseconds const& etcd::Response::duration() const {
   return this->_duration;
 }
+
+uint64_t etcd::Response::cluster_id() const {
+  return this->_cluster_id;
+}
+
+uint64_t etcd::Response::member_id() const {
+  return this->_member_id;
+}
+
+uint64_t etcd::Response::raft_term() const {
+  return this->_raft_term;
+}

src/v3/AsyncHeadResponse.cpp

@@ -4,5 +4,8 @@
 
 void etcdv3::AsyncHeadResponse::ParseResponse(RangeResponse& resp)
 {
+  cluster_id = resp.header().cluster_id();
+  member_id = resp.header().member_id();
   index = resp.header().revision();
+  raft_term = resp.header().raft_term();
 }

src/v3/V3Response.cpp

@@ -85,3 +85,15 @@ std::string const & etcdv3::V3Response::get_name() const {
 std::vector<mvccpb::Event> const & etcdv3::V3Response::get_events() const {
   return this->events;
 }
+
+uint64_t etcdv3::V3Response::get_cluster_id() const {
+  return this->cluster_id;
+}
+
+uint64_t etcdv3::V3Response::get_member_id() const {
+  return this->member_id;
+}
+
+uint64_t etcdv3::V3Response::get_raft_term() const {
+  return this->raft_term;
+}