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Restrict functions and structs that aren't used outside of the

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nodecontroller to have package private scope. This makes reasoning
about the code in this package much simpler.
This commit is contained in:
Robert Bailey
2015-04-10 15:30:11 -07:00
parent 2823576194
commit f633ac0ab5
3 changed files with 49 additions and 51 deletions
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75
pkg/cloudprovider/nodecontroller/nodecontroller.go
View File

@@ -41,12 +41,10 @@ var (
ErrCloudInstance = errors.New("cloud provider doesn't support instances.")
)
const (
// Constant controlling number of retries of writing NodeStatus update.
nodeStatusUpdateRetry = 5
)
// nodeStatusUpdateRetry controls the number of retries of writing NodeStatus update.
const nodeStatusUpdateRetry = 5
type NodeStatusData struct {
type nodeStatusData struct {
probeTimestamp util.Time
readyTransitionTimestamp util.Time
status api.NodeStatus
@@ -62,10 +60,10 @@ type NodeController struct {
registerRetryCount int
podEvictionTimeout time.Duration
deletingPodsRateLimiter util.RateLimiter
// per Node map storing last observed Status togheter with a local time when it was observed.
// per Node map storing last observed Status together with a local time when it was observed.
// This timestamp is to be used instead of LastProbeTime stored in Condition. We do this
// to aviod the problem with time skew across the cluster.
nodeStatusMap map[string]NodeStatusData
nodeStatusMap map[string]nodeStatusData
// Value used if sync_nodes_status=False. NodeController will not proactively
// sync node status in this case, but will monitor node status updated from kubelet. If
// it doesn't receive update for this amount of time, it will start posting "NodeReady==
@@ -128,7 +126,7 @@ func NewNodeController(
registerRetryCount: registerRetryCount,
podEvictionTimeout: podEvictionTimeout,
deletingPodsRateLimiter: deletingPodsRateLimiter,
nodeStatusMap: make(map[string]NodeStatusData),
nodeStatusMap: make(map[string]nodeStatusData),
nodeMonitorGracePeriod: nodeMonitorGracePeriod,
nodeMonitorPeriod: nodeMonitorPeriod,
nodeStartupGracePeriod: nodeStartupGracePeriod,
@@ -140,12 +138,12 @@ func NewNodeController(
// Run creates initial node list and start syncing instances from cloudprovider, if any.
// It also starts syncing or monitoring cluster node status.
// 1. RegisterNodes() is called only once to register all initial nodes (from cloudprovider
// 1. registerNodes() is called only once to register all initial nodes (from cloudprovider
// or from command line flag). To make cluster bootstrap faster, node controller populates
// node addresses.
// 2. SyncCloudNodes() is called periodically (if enabled) to sync instances from cloudprovider.
// 2. syncCloudNodes() is called periodically (if enabled) to sync instances from cloudprovider.
// Node created here will only have specs.
// 3. MonitorNodeStatus() is called periodically to incorporate the results of node status
// 3. monitorNodeStatus() is called periodically to incorporate the results of node status
// pushed from kubelet to master.
func (nc *NodeController) Run(period time.Duration, syncNodeList bool) {
// Register intial set of nodes with their status set.
@@ -153,28 +151,29 @@ func (nc *NodeController) Run(period time.Duration, syncNodeList bool) {
var err error
if nc.isRunningCloudProvider() {
if syncNodeList {
if nodes, err = nc.GetCloudNodesWithSpec(); err != nil {
if nodes, err = nc.getCloudNodesWithSpec(); err != nil {
glog.Errorf("Error loading initial node from cloudprovider: %v", err)
}
} else {
nodes = &api.NodeList{}
}
} else {
if nodes, err = nc.GetStaticNodesWithSpec(); err != nil {
if nodes, err = nc.getStaticNodesWithSpec(); err != nil {
glog.Errorf("Error loading initial static nodes: %v", err)
}
}
if nodes, err = nc.PopulateAddresses(nodes); err != nil {
if nodes, err = nc.populateAddresses(nodes); err != nil {
glog.Errorf("Error getting nodes ips: %v", err)
}
if err = nc.RegisterNodes(nodes, nc.registerRetryCount, period); err != nil {
if err := nc.registerNodes(nodes, nc.registerRetryCount, period); err != nil {
glog.Errorf("Error registering node list %+v: %v", nodes, err)
}
// Start syncing node list from cloudprovider.
if syncNodeList && nc.isRunningCloudProvider() {
go util.Forever(func() {
if err := nc.SyncCloudNodes(); err != nil {
if err := nc.syncCloudNodes(); err != nil {
glog.Errorf("Error syncing cloud: %v", err)
}
}, period)
@@ -182,14 +181,14 @@ func (nc *NodeController) Run(period time.Duration, syncNodeList bool) {
// Start monitoring node status.
go util.Forever(func() {
if err = nc.MonitorNodeStatus(); err != nil {
if err := nc.monitorNodeStatus(); err != nil {
glog.Errorf("Error monitoring node status: %v", err)
}
}, nc.nodeMonitorPeriod)
}
// RegisterNodes registers the given list of nodes, it keeps retrying for `retryCount` times.
func (nc *NodeController) RegisterNodes(nodes *api.NodeList, retryCount int, retryInterval time.Duration) error {
// registerNodes registers the given list of nodes, it keeps retrying for `retryCount` times.
func (nc *NodeController) registerNodes(nodes *api.NodeList, retryCount int, retryInterval time.Duration) error {
if len(nodes.Items) == 0 {
return nil
}
@@ -278,9 +277,9 @@ func (nc *NodeController) reconcileExternalServices(nodes *api.NodeList) (should
return shouldRetry
}
// SyncCloudNodes synchronizes the list of instances from cloudprovider to master server.
func (nc *NodeController) SyncCloudNodes() error {
matches, err := nc.GetCloudNodesWithSpec()
// syncCloudNodes synchronizes the list of instances from cloudprovider to master server.
func (nc *NodeController) syncCloudNodes() error {
matches, err := nc.getCloudNodesWithSpec()
if err != nil {
return err
}
@@ -302,7 +301,7 @@ func (nc *NodeController) SyncCloudNodes() error {
glog.V(3).Infof("Querying addresses for new node: %s", node.Name)
nodeList := &api.NodeList{}
nodeList.Items = []api.Node{node}
_, err = nc.PopulateAddresses(nodeList)
_, err = nc.populateAddresses(nodeList)
if err != nil {
glog.Errorf("Error fetching addresses for new node %s: %v", node.Name, err)
continue
@@ -341,8 +340,8 @@ func (nc *NodeController) SyncCloudNodes() error {
return nil
}
// PopulateAddresses queries Address for given list of nodes.
func (nc *NodeController) PopulateAddresses(nodes *api.NodeList) (*api.NodeList, error) {
// populateAddresses queries Address for given list of nodes.
func (nc *NodeController) populateAddresses(nodes *api.NodeList) (*api.NodeList, error) {
if nc.isRunningCloudProvider() {
instances, ok := nc.cloud.Instances()
if !ok {
@@ -411,7 +410,7 @@ func (nc *NodeController) tryUpdateNodeStatus(node *api.Node) (time.Duration, ap
LastTransitionTime: node.CreationTimestamp,
}
gracePeriod = nc.nodeStartupGracePeriod
nc.nodeStatusMap[node.Name] = NodeStatusData{
nc.nodeStatusMap[node.Name] = nodeStatusData{
status: node.Status,
probeTimestamp: node.CreationTimestamp,
readyTransitionTimestamp: node.CreationTimestamp,
@@ -441,7 +440,7 @@ func (nc *NodeController) tryUpdateNodeStatus(node *api.Node) (time.Duration, ap
observedCondition := nc.getCondition(&node.Status, api.NodeReady)
if !found {
glog.Warningf("Missing timestamp for Node %s. Assuming now as a timestamp.", node.Name)
savedNodeStatus = NodeStatusData{
savedNodeStatus = nodeStatusData{
status: node.Status,
probeTimestamp: nc.now(),
readyTransitionTimestamp: nc.now(),
@@ -449,7 +448,7 @@ func (nc *NodeController) tryUpdateNodeStatus(node *api.Node) (time.Duration, ap
nc.nodeStatusMap[node.Name] = savedNodeStatus
} else if savedCondition == nil && observedCondition != nil {
glog.V(1).Infof("Creating timestamp entry for newly observed Node %s", node.Name)
savedNodeStatus = NodeStatusData{
savedNodeStatus = nodeStatusData{
status: node.Status,
probeTimestamp: nc.now(),
readyTransitionTimestamp: nc.now(),
@@ -458,7 +457,7 @@ func (nc *NodeController) tryUpdateNodeStatus(node *api.Node) (time.Duration, ap
} else if savedCondition != nil && observedCondition == nil {
glog.Errorf("ReadyCondition was removed from Status of Node %s", node.Name)
// TODO: figure out what to do in this case. For now we do the same thing as above.
savedNodeStatus = NodeStatusData{
savedNodeStatus = nodeStatusData{
status: node.Status,
probeTimestamp: nc.now(),
readyTransitionTimestamp: nc.now(),
@@ -476,7 +475,7 @@ func (nc *NodeController) tryUpdateNodeStatus(node *api.Node) (time.Duration, ap
transitionTime = savedNodeStatus.readyTransitionTimestamp
}
glog.V(3).Infof("Nodes ReadyCondition updated. Updating timestamp: %+v\n vs %+v.", savedNodeStatus.status, node.Status)
savedNodeStatus = NodeStatusData{
savedNodeStatus = nodeStatusData{
status: node.Status,
probeTimestamp: nc.now(),
readyTransitionTimestamp: transitionTime,
@@ -512,7 +511,7 @@ func (nc *NodeController) tryUpdateNodeStatus(node *api.Node) (time.Duration, ap
glog.Errorf("Error updating node %s: %v", node.Name, err)
return gracePeriod, lastReadyCondition, readyCondition, err
} else {
nc.nodeStatusMap[node.Name] = NodeStatusData{
nc.nodeStatusMap[node.Name] = nodeStatusData{
status: node.Status,
probeTimestamp: nc.nodeStatusMap[node.Name].probeTimestamp,
readyTransitionTimestamp: nc.now(),
@@ -525,10 +524,10 @@ func (nc *NodeController) tryUpdateNodeStatus(node *api.Node) (time.Duration, ap
return gracePeriod, lastReadyCondition, readyCondition, err
}
// MonitorNodeStatus verifies node status are constantly updated by kubelet, and if not,
// monitorNodeStatus verifies node status are constantly updated by kubelet, and if not,
// post "NodeReady==ConditionUnknown". It also evicts all pods if node is not ready or
// not reachable for a long period of time.
func (nc *NodeController) MonitorNodeStatus() error {
func (nc *NodeController) monitorNodeStatus() error {
nodes, err := nc.kubeClient.Nodes().List(labels.Everything(), fields.Everything())
if err != nil {
return err
@@ -592,10 +591,10 @@ func (nc *NodeController) MonitorNodeStatus() error {
return nil
}
// GetStaticNodesWithSpec constructs and returns api.NodeList for static nodes. If error
// getStaticNodesWithSpec constructs and returns api.NodeList for static nodes. If error
// occurs, an empty NodeList will be returned with a non-nil error info. The method only
// constructs spec fields for nodes.
func (nc *NodeController) GetStaticNodesWithSpec() (*api.NodeList, error) {
func (nc *NodeController) getStaticNodesWithSpec() (*api.NodeList, error) {
result := &api.NodeList{}
for _, nodeID := range nc.nodes {
node := api.Node{
@@ -612,10 +611,10 @@ func (nc *NodeController) GetStaticNodesWithSpec() (*api.NodeList, error) {
return result, nil
}
// GetCloudNodesWithSpec constructs and returns api.NodeList from cloudprovider. If error
// getCloudNodesWithSpec constructs and returns api.NodeList from cloudprovider. If error
// occurs, an empty NodeList will be returned with a non-nil error info. The method only
// constructs spec fields for nodes.
func (nc *NodeController) GetCloudNodesWithSpec() (*api.NodeList, error) {
func (nc *NodeController) getCloudNodesWithSpec() (*api.NodeList, error) {
result := &api.NodeList{}
instances, ok := nc.cloud.Instances()
if !ok {
@@ -640,7 +639,7 @@ func (nc *NodeController) GetCloudNodesWithSpec() (*api.NodeList, error) {
}
instanceID, err := instances.ExternalID(node.Name)
if err != nil {
glog.Errorf("error getting instance id for %s: %v", node.Name, err)
glog.Errorf("Error getting instance id for %s: %v", node.Name, err)
} else {
node.Spec.ExternalID = instanceID
}

22
pkg/cloudprovider/nodecontroller/nodecontroller_test.go
View File

@@ -239,7 +239,7 @@ func TestRegisterNodes(t *testing.T) {
}
nodeController := NewNodeController(nil, "", item.machines, &api.NodeResources{}, item.fakeNodeHandler, 10, time.Minute,
util.NewFakeRateLimiter(), testNodeMonitorGracePeriod, testNodeStartupGracePeriod, testNodeMonitorPeriod, "")
err := nodeController.RegisterNodes(&nodes, item.retryCount, time.Millisecond)
err := nodeController.registerNodes(&nodes, item.retryCount, time.Millisecond)
if !item.expectedFail && err != nil {
t.Errorf("unexpected error: %v", err)
}
@@ -325,7 +325,7 @@ func TestCreateGetStaticNodesWithSpec(t *testing.T) {
for _, item := range table {
nodeController := NewNodeController(nil, "", item.machines, &resources, nil, 10, time.Minute,
util.NewFakeRateLimiter(), testNodeMonitorGracePeriod, testNodeStartupGracePeriod, testNodeMonitorPeriod, "")
nodes, err := nodeController.GetStaticNodesWithSpec()
nodes, err := nodeController.getStaticNodesWithSpec()
if err != nil {
t.Errorf("unexpected error: %v", err)
}
@@ -387,7 +387,7 @@ func TestCreateGetCloudNodesWithSpec(t *testing.T) {
for _, item := range table {
nodeController := NewNodeController(item.fakeCloud, ".*", nil, &api.NodeResources{}, nil, 10, time.Minute,
util.NewFakeRateLimiter(), testNodeMonitorGracePeriod, testNodeStartupGracePeriod, testNodeMonitorPeriod, "")
nodes, err := nodeController.GetCloudNodesWithSpec()
nodes, err := nodeController.getCloudNodesWithSpec()
if err != nil {
t.Errorf("unexpected error: %v", err)
}
@@ -497,7 +497,7 @@ func TestSyncCloudNodes(t *testing.T) {
}
nodeController := NewNodeController(item.fakeCloud, item.matchRE, nil, &api.NodeResources{}, item.fakeNodeHandler, 10, time.Minute,
util.NewFakeRateLimiter(), testNodeMonitorGracePeriod, testNodeStartupGracePeriod, testNodeMonitorPeriod, "")
if err := nodeController.SyncCloudNodes(); err != nil {
if err := nodeController.syncCloudNodes(); err != nil {
t.Errorf("unexpected error: %v", err)
}
if item.fakeNodeHandler.RequestCount != item.expectedRequestCount {
@@ -581,7 +581,7 @@ func TestSyncCloudNodesEvictPods(t *testing.T) {
}
nodeController := NewNodeController(item.fakeCloud, item.matchRE, nil, &api.NodeResources{}, item.fakeNodeHandler, 10, time.Minute,
util.NewFakeRateLimiter(), testNodeMonitorGracePeriod, testNodeStartupGracePeriod, testNodeMonitorPeriod, "")
if err := nodeController.SyncCloudNodes(); err != nil {
if err := nodeController.syncCloudNodes(); err != nil {
t.Errorf("unexpected error: %v", err)
}
if item.fakeNodeHandler.RequestCount != item.expectedRequestCount {
@@ -650,7 +650,7 @@ func TestSyncCloudNodesReconcilesExternalService(t *testing.T) {
for _, item := range table {
nodeController := NewNodeController(item.fakeCloud, item.matchRE, nil, &api.NodeResources{}, item.fakeNodeHandler,
10, time.Minute, util.NewFakeRateLimiter(), testNodeMonitorGracePeriod, testNodeStartupGracePeriod, testNodeMonitorPeriod, "kubernetes")
if err := nodeController.SyncCloudNodes(); err != nil {
if err := nodeController.syncCloudNodes(); err != nil {
t.Errorf("unexpected error: %v", err)
}
if !reflect.DeepEqual(item.expectedClientActions, item.fakeNodeHandler.Actions) {
@@ -686,7 +686,7 @@ func TestPopulateNodeAddresses(t *testing.T) {
for _, item := range table {
nodeController := NewNodeController(item.fakeCloud, ".*", nil, nil, nil, 10, time.Minute,
util.NewFakeRateLimiter(), testNodeMonitorGracePeriod, testNodeStartupGracePeriod, testNodeMonitorPeriod, "")
result, err := nodeController.PopulateAddresses(item.nodes)
result, err := nodeController.populateAddresses(item.nodes)
// In case of IP querying error, we should continue.
if err != nil {
t.Errorf("unexpected error: %v", err)
@@ -887,14 +887,14 @@ func TestMonitorNodeStatusEvictPods(t *testing.T) {
evictionTimeout, util.NewFakeRateLimiter(), testNodeMonitorGracePeriod,
testNodeStartupGracePeriod, testNodeMonitorPeriod, "")
nodeController.now = func() util.Time { return fakeNow }
if err := nodeController.MonitorNodeStatus(); err != nil {
if err := nodeController.monitorNodeStatus(); err != nil {
t.Errorf("unexpected error: %v", err)
}
if item.timeToPass > 0 {
nodeController.now = func() util.Time { return util.Time{Time: fakeNow.Add(item.timeToPass)} }
item.fakeNodeHandler.Existing[0].Status = item.newNodeStatus
}
if err := nodeController.MonitorNodeStatus(); err != nil {
if err := nodeController.monitorNodeStatus(); err != nil {
t.Errorf("unexpected error: %v", err)
}
podEvicted := false
@@ -1089,13 +1089,13 @@ func TestMonitorNodeStatusUpdateStatus(t *testing.T) {
nodeController := NewNodeController(nil, "", []string{"node0"}, nil, item.fakeNodeHandler, 10, 5*time.Minute, util.NewFakeRateLimiter(),
testNodeMonitorGracePeriod, testNodeStartupGracePeriod, testNodeMonitorPeriod, "")
nodeController.now = func() util.Time { return fakeNow }
if err := nodeController.MonitorNodeStatus(); err != nil {
if err := nodeController.monitorNodeStatus(); err != nil {
t.Errorf("unexpected error: %v", err)
}
if item.timeToPass > 0 {
nodeController.now = func() util.Time { return util.Time{Time: fakeNow.Add(item.timeToPass)} }
item.fakeNodeHandler.Existing[0].Status = item.newNodeStatus
if err := nodeController.MonitorNodeStatus(); err != nil {
if err := nodeController.monitorNodeStatus(); err != nil {
t.Errorf("unexpected error: %v", err)
}
}

3
pkg/cloudprovider/plugins.go
View File

@@ -39,8 +39,7 @@ var providers = make(map[string]Factory)
func RegisterCloudProvider(name string, cloud Factory) {
providersMutex.Lock()
defer providersMutex.Unlock()
_, found := providers[name]
if found {
if _, found := providers[name]; found {
glog.Fatalf("Cloud provider %q was registered twice", name)
}
glog.V(1).Infof("Registered cloud provider %q", name)