/usr/share/gocode/src/github.com/hashicorp/raft/state.go is in golang-github-hashicorp-raft-dev 0.0~git20150728.9b586e2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import (
"sync/atomic"
)
// RaftState captures the state of a Raft node: Follower, Candidate, Leader,
// or Shutdown.
type RaftState uint32
const (
// Follower is the initial state of a Raft node.
Follower RaftState = iota
// Candidate is one of the valid states of a Raft node.
Candidate
// Leader is one of the valid states of a Raft node.
Leader
// Shutdown is the terminal state of a Raft node.
Shutdown
)
func (s RaftState) String() string {
switch s {
case Follower:
return "Follower"
case Candidate:
return "Candidate"
case Leader:
return "Leader"
case Shutdown:
return "Shutdown"
default:
return "Unknown"
}
}
// raftState is used to maintain various state variables
// and provides an interface to set/get the variables in a
// thread safe manner.
type raftState struct {
// The current term, cache of StableStore
currentTerm uint64
// Cache the latest log from LogStore
LastLogIndex uint64
LastLogTerm uint64
// Highest committed log entry
commitIndex uint64
// Last applied log to the FSM
lastApplied uint64
// Cache the latest snapshot index/term
lastSnapshotIndex uint64
lastSnapshotTerm uint64
// Tracks the number of live routines
runningRoutines int32
// The current state
state RaftState
}
func (r *raftState) getState() RaftState {
stateAddr := (*uint32)(&r.state)
return RaftState(atomic.LoadUint32(stateAddr))
}
func (r *raftState) setState(s RaftState) {
stateAddr := (*uint32)(&r.state)
atomic.StoreUint32(stateAddr, uint32(s))
}
func (r *raftState) getCurrentTerm() uint64 {
return atomic.LoadUint64(&r.currentTerm)
}
func (r *raftState) setCurrentTerm(term uint64) {
atomic.StoreUint64(&r.currentTerm, term)
}
func (r *raftState) getLastLogIndex() uint64 {
return atomic.LoadUint64(&r.LastLogIndex)
}
func (r *raftState) setLastLogIndex(term uint64) {
atomic.StoreUint64(&r.LastLogIndex, term)
}
func (r *raftState) getLastLogTerm() uint64 {
return atomic.LoadUint64(&r.LastLogTerm)
}
func (r *raftState) setLastLogTerm(term uint64) {
atomic.StoreUint64(&r.LastLogTerm, term)
}
func (r *raftState) getCommitIndex() uint64 {
return atomic.LoadUint64(&r.commitIndex)
}
func (r *raftState) setCommitIndex(term uint64) {
atomic.StoreUint64(&r.commitIndex, term)
}
func (r *raftState) getLastApplied() uint64 {
return atomic.LoadUint64(&r.lastApplied)
}
func (r *raftState) setLastApplied(term uint64) {
atomic.StoreUint64(&r.lastApplied, term)
}
func (r *raftState) getLastSnapshotIndex() uint64 {
return atomic.LoadUint64(&r.lastSnapshotIndex)
}
func (r *raftState) setLastSnapshotIndex(term uint64) {
atomic.StoreUint64(&r.lastSnapshotIndex, term)
}
func (r *raftState) getLastSnapshotTerm() uint64 {
return atomic.LoadUint64(&r.lastSnapshotTerm)
}
func (r *raftState) setLastSnapshotTerm(term uint64) {
atomic.StoreUint64(&r.lastSnapshotTerm, term)
}
func (r *raftState) incrRoutines() {
atomic.AddInt32(&r.runningRoutines, 1)
}
func (r *raftState) decrRoutines() {
atomic.AddInt32(&r.runningRoutines, -1)
}
func (r *raftState) getRoutines() int32 {
return atomic.LoadInt32(&r.runningRoutines)
}
// Start a goroutine and properly handle the race between a routine
// starting and incrementing, and exiting and decrementing.
func (r *raftState) goFunc(f func()) {
r.incrRoutines()
go func() {
defer r.decrRoutines()
f()
}()
}
// getLastIndex returns the last index in stable storage.
// Either from the last log or from the last snapshot.
func (r *raftState) getLastIndex() uint64 {
return max(r.getLastLogIndex(), r.getLastSnapshotIndex())
}
// getLastEntry returns the last index and term in stable storage.
// Either from the last log or from the last snapshot.
func (r *raftState) getLastEntry() (uint64, uint64) {
if r.getLastLogIndex() >= r.getLastSnapshotIndex() {
return r.getLastLogIndex(), r.getLastLogTerm()
}
return r.getLastSnapshotIndex(), r.getLastSnapshotTerm()
}
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