Golang Version.String方法代碼示例

func mustSaveClusterVersionToBackend(be backend.Backend, ver *semver.Version) {
	ckey := backendClusterVersionKey()

	tx := be.BatchTx()
	tx.Lock()
	defer tx.Unlock()
	tx.UnsafePut(clusterBucketName, ckey, []byte(ver.String()))
}

func (c *cluster) SetVersion(ver *semver.Version) {
	c.Lock()
	defer c.Unlock()
	if c.version != nil {
		plog.Noticef("updated the cluster version from %v to %v", c.version.String(), ver.String())
	} else {
		plog.Noticef("set the initial cluster version to %v", ver.String())
	}
	c.version = ver
}

func (c *RaftCluster) SetVersion(ver *semver.Version) {
	c.Lock()
	defer c.Unlock()
	if c.version != nil {
		plog.Noticef("updated the cluster version from %v to %v", version.Cluster(c.version.String()), version.Cluster(ver.String()))
	} else {
		plog.Noticef("set the initial cluster version to %v", version.Cluster(ver.String()))
	}
	c.version = ver
	mustDetectDowngrade(c.version)
}

// UpdateCapability updates the enabledMap when the cluster version increases.
func UpdateCapability(v *semver.Version) {
	if v == nil {
		// if recovered but version was never set by cluster
		return
	}
	enableMapMu.Lock()
	if curVersion != nil && !curVersion.LessThan(*v) {
		enableMapMu.Unlock()
		return
	}
	curVersion = v
	enabledMap = capabilityMaps[curVersion.String()]
	enableMapMu.Unlock()
	plog.Infof("enabled capabilities for version %s", version.Cluster(v.String()))
}

func (c *RaftCluster) SetVersion(ver *semver.Version, onSet func(*semver.Version)) {
	c.Lock()
	defer c.Unlock()
	if c.version != nil {
		plog.Noticef("updated the cluster version from %v to %v", version.Cluster(c.version.String()), version.Cluster(ver.String()))
	} else {
		plog.Noticef("set the initial cluster version to %v", version.Cluster(ver.String()))
	}
	c.version = ver
	mustDetectDowngrade(c.version)
	if c.store != nil {
		mustSaveClusterVersionToStore(c.store, ver)
	}
	if c.be != nil {
		mustSaveClusterVersionToBackend(c.be, ver)
	}
	onSet(ver)
}

// capabilityLoop checks the cluster version every 500ms and updates
// the enabledMap when the cluster version increased.
// capabilityLoop MUST be ran in a goroutine before checking capability
// or using capabilityHandler.
func capabilityLoop(s *etcdserver.EtcdServer) {
	stopped := s.StopNotify()

	var pv *semver.Version
	for {
		if v := s.ClusterVersion(); v != pv {
			if pv == nil || (v != nil && pv.LessThan(*v)) {
				pv = v
				enableMapMu.Lock()
				enabledMap = capabilityMaps[pv.String()]
				enableMapMu.Unlock()
				plog.Infof("enabled capabilities for version %s", pv)
			}
		}

		select {
		case <-stopped:
			return
		case <-time.After(500 * time.Millisecond):
		}
	}
}

func mustSaveClusterVersionToStore(s store.Store, ver *semver.Version) {
	if _, err := s.Set(StoreClusterVersionKey(), false, ver.String(), store.TTLOptionSet{ExpireTime: store.Permanent}); err != nil {
		plog.Panicf("save cluster version should never fail: %v", err)
	}
}

func MustDetectDowngrade(cv *semver.Version) {
	lv := semver.Must(semver.NewVersion(version.Version))
	// only keep major.minor version for comparison against cluster version
	lv = &semver.Version{Major: lv.Major, Minor: lv.Minor}
	if cv != nil && lv.LessThan(*cv) {
		plog.Fatalf("cluster cannot be downgraded (current version: %s is lower than determined cluster version: %s).", version.Version, version.Cluster(cv.String()))
	}
}

func isCompatibleWithVers(vers map[string]*version.Versions, local types.ID, minV, maxV *semver.Version) bool {
	var ok bool
	for id, v := range vers {
		// ignore comparison with local version
		if id == local.String() {
			continue
		}
		if v == nil {
			continue
		}
		clusterv, err := semver.NewVersion(v.Cluster)
		if err != nil {
			plog.Errorf("cannot understand the cluster version of member %s (%v)", id, err)
			continue
		}
		if clusterv.LessThan(*minV) {
			plog.Warningf("the running cluster version(%v) is lower than the minimal cluster version(%v) supported", clusterv.String(), minV.String())
			return false
		}
		if maxV.LessThan(*clusterv) {
			plog.Warningf("the running cluster version(%v) is higher than the maximum cluster version(%v) supported", clusterv.String(), maxV.String())
			return false
		}
		ok = true
	}
	return ok
}