1// Copyright 2015 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 15package raft 16 17import ( 18 "fmt" 19 20 pb "github.com/coreos/etcd/raft/raftpb" 21) 22 23type Status struct { 24 ID uint64 25 26 pb.HardState 27 SoftState 28 29 Applied uint64 30 Progress map[uint64]Progress 31 32 LeadTransferee uint64 33} 34 35// getStatus gets a copy of the current raft status. 36func getStatus(r *raft) Status { 37 s := Status{ 38 ID: r.id, 39 LeadTransferee: r.leadTransferee, 40 } 41 42 s.HardState = r.hardState() 43 s.SoftState = *r.softState() 44 45 s.Applied = r.raftLog.applied 46 47 if s.RaftState == StateLeader { 48 s.Progress = make(map[uint64]Progress) 49 for id, p := range r.prs { 50 s.Progress[id] = *p 51 } 52 53 for id, p := range r.learnerPrs { 54 s.Progress[id] = *p 55 } 56 } 57 58 return s 59} 60 61// MarshalJSON translates the raft status into JSON. 62// TODO: try to simplify this by introducing ID type into raft 63func (s Status) MarshalJSON() ([]byte, error) { 64 j := fmt.Sprintf(`{"id":"%x","term":%d,"vote":"%x","commit":%d,"lead":"%x","raftState":%q,"applied":%d,"progress":{`, 65 s.ID, s.Term, s.Vote, s.Commit, s.Lead, s.RaftState, s.Applied) 66 67 if len(s.Progress) == 0 { 68 j += "}," 69 } else { 70 for k, v := range s.Progress { 71 subj := fmt.Sprintf(`"%x":{"match":%d,"next":%d,"state":%q},`, k, v.Match, v.Next, v.State) 72 j += subj 73 } 74 // remove the trailing "," 75 j = j[:len(j)-1] + "}," 76 } 77 78 j += fmt.Sprintf(`"leadtransferee":"%x"}`, s.LeadTransferee) 79 return []byte(j), nil 80} 81 82func (s Status) String() string { 83 b, err := s.MarshalJSON() 84 if err != nil { 85 raftLogger.Panicf("unexpected error: %v", err) 86 } 87 return string(b) 88} 89