header.go

Documentation: go.etcd.io/etcd/server/v3/etcdserver/api/v3rpc

     1  // Copyright 2016 The etcd Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package v3rpc
    16  
    17  import (
    18  	pb "go.etcd.io/etcd/api/v3/etcdserverpb"
    19  	"go.etcd.io/etcd/server/v3/etcdserver"
    20  )
    21  
    22  type header struct {
    23  	clusterID int64
    24  	memberID  int64
    25  	sg        etcdserver.RaftStatusGetter
    26  	rev       func() int64
    27  }
    28  
    29  func newHeader(s *etcdserver.EtcdServer) header {
    30  	return header{
    31  		clusterID: int64(s.Cluster().ID()),
    32  		memberID:  int64(s.ID()),
    33  		sg:        s,
    34  		rev:       func() int64 { return s.KV().Rev() },
    35  	}
    36  }
    37  
    38  // fill populates pb.ResponseHeader using etcdserver information
    39  func (h *header) fill(rh *pb.ResponseHeader) {
    40  	if rh == nil {
    41  		panic("unexpected nil resp.Header")
    42  	}
    43  	rh.ClusterId = uint64(h.clusterID)
    44  	rh.MemberId = uint64(h.memberID)
    45  	rh.RaftTerm = h.sg.Term()
    46  	if rh.Revision == 0 {
    47  		rh.Revision = h.rev()
    48  	}
    49  }
    50
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