mirror of
https://github.com/ceph/ceph-csi.git
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222 lines
7.9 KiB
Go
222 lines
7.9 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package ipamperf
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import (
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"bytes"
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"fmt"
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"sort"
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"sync"
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"time"
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"github.com/golang/glog"
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"k8s.io/api/core/v1"
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"k8s.io/client-go/informers"
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clientset "k8s.io/client-go/kubernetes"
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"k8s.io/client-go/tools/cache"
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"k8s.io/kubernetes/pkg/cloudprovider"
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"k8s.io/kubernetes/pkg/controller/nodeipam/ipam"
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nodeutil "k8s.io/kubernetes/pkg/controller/util/node"
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)
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// Config represents the test configuration that is being run
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type Config struct {
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CreateQPS int // rate at which nodes are created
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KubeQPS int // rate for communication with kubernetes API
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CloudQPS int // rate for communication with cloud endpoint
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NumNodes int // number of nodes to created and monitored
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AllocatorType ipam.CIDRAllocatorType // type of allocator to run
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Cloud cloudprovider.Interface // cloud provider
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}
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type nodeTime struct {
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added time.Time // observed time for when node was added
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allocated time.Time // observed time for when node was assigned podCIDR
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podCIDR string // the allocated podCIDR range
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}
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// Observer represents the handle to test observer that watches for node changes
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// and tracks behavior
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type Observer struct {
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numAdded int // number of nodes observed added
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numAllocated int // number of nodes observed allocated podCIDR
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timing map[string]*nodeTime // per node timing
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numNodes int // the number of nodes to expect
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stopChan chan struct{} // for the shared informer
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wg sync.WaitGroup
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clientSet *clientset.Clientset
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}
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// JSONDuration is an alias of time.Duration to support custom Marshal code
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type JSONDuration time.Duration
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// NodeDuration represents the CIDR allocation time for each node
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type NodeDuration struct {
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Name string // node name
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PodCIDR string // the podCIDR that was assigned to the node
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Duration JSONDuration // how long it took to assign podCIDR
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}
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// Results represents the observed test results.
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type Results struct {
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Name string // name for the test
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Config *Config // handle to the test config
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Succeeded bool // whether all nodes were assigned podCIDR
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MaxAllocTime JSONDuration // the maximum time take for assignment per node
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TotalAllocTime JSONDuration // duration between first addition and last assignment
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NodeAllocTime []NodeDuration // assignment time by node name
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}
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// NewObserver creates a new observer given a handle to the Clientset
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func NewObserver(clientSet *clientset.Clientset, numNodes int) *Observer {
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o := &Observer{
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timing: map[string]*nodeTime{},
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numNodes: numNodes,
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clientSet: clientSet,
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stopChan: make(chan struct{}),
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}
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return o
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}
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// StartObserving starts an asynchronous loop to monitor for node changes.
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// Call Results() to get the test results after starting observer.
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func (o *Observer) StartObserving() error {
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o.monitor()
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glog.Infof("Test observer started")
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return nil
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}
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// Results returns the test results. It waits for the observer to finish
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// and returns the computed results of the observations.
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func (o *Observer) Results(name string, config *Config) *Results {
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var (
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firstAdd time.Time // earliest time any node was added (first node add)
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lastAssignment time.Time // latest time any node was assignged CIDR (last node assignment)
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)
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o.wg.Wait()
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close(o.stopChan) // shutdown the shared informer
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results := &Results{
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Name: name,
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Config: config,
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Succeeded: o.numAdded == o.numNodes && o.numAllocated == o.numNodes,
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MaxAllocTime: 0,
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NodeAllocTime: []NodeDuration{},
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}
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for name, nTime := range o.timing {
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addFound := !nTime.added.IsZero()
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if addFound && (firstAdd.IsZero() || nTime.added.Before(firstAdd)) {
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firstAdd = nTime.added
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}
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cidrFound := !nTime.allocated.IsZero()
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if cidrFound && nTime.allocated.After(lastAssignment) {
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lastAssignment = nTime.allocated
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}
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if addFound && cidrFound {
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allocTime := nTime.allocated.Sub(nTime.added)
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if allocTime > time.Duration(results.MaxAllocTime) {
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results.MaxAllocTime = JSONDuration(allocTime)
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}
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results.NodeAllocTime = append(results.NodeAllocTime, NodeDuration{
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Name: name, PodCIDR: nTime.podCIDR, Duration: JSONDuration(allocTime),
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})
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}
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}
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results.TotalAllocTime = JSONDuration(lastAssignment.Sub(firstAdd))
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sort.Slice(results.NodeAllocTime, func(i, j int) bool {
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return results.NodeAllocTime[i].Duration > results.NodeAllocTime[j].Duration
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})
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return results
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}
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func (o *Observer) monitor() {
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o.wg.Add(1)
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sharedInformer := informers.NewSharedInformerFactory(o.clientSet, 1*time.Second)
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nodeInformer := sharedInformer.Core().V1().Nodes().Informer()
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nodeInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
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AddFunc: nodeutil.CreateAddNodeHandler(func(node *v1.Node) (err error) {
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name := node.GetName()
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if node.Spec.PodCIDR != "" {
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// ignore nodes that have PodCIDR (might be hold over from previous runs that did not get cleaned up)
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return
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}
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nTime := &nodeTime{}
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o.timing[name] = nTime
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nTime.added = time.Now()
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o.numAdded = o.numAdded + 1
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return
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}),
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UpdateFunc: nodeutil.CreateUpdateNodeHandler(func(oldNode, newNode *v1.Node) (err error) {
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name := newNode.GetName()
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nTime, found := o.timing[name]
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if !found {
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return // consistency check - ignore nodes we have not seen the add event for
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}
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// check if CIDR assigned and ignore redundant updates
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if newNode.Spec.PodCIDR != "" && nTime.podCIDR == "" {
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nTime.allocated = time.Now()
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nTime.podCIDR = newNode.Spec.PodCIDR
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o.numAllocated++
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if o.numAllocated%10 == 0 {
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glog.Infof("progress: %d/%d - %.2d%%", o.numAllocated, o.numNodes, (o.numAllocated * 100.0 / o.numNodes))
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}
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// do following check only if numAllocated is modified, as otherwise, redundant updates
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// can cause wg.Done() to be called multiple times, causing a panic
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if o.numAdded == o.numNodes && o.numAllocated == o.numNodes {
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glog.Info("All nodes assigned podCIDR")
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o.wg.Done()
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}
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}
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return
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}),
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})
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sharedInformer.Start(o.stopChan)
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}
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// String implements the Stringer interface and returns a multi-line representation
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// of the test results.
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func (results *Results) String() string {
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var b bytes.Buffer
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fmt.Fprintf(&b, "\n TestName: %s", results.Name)
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fmt.Fprintf(&b, "\n NumNodes: %d, CreateQPS: %d, KubeQPS: %d, CloudQPS: %d, Allocator: %v",
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results.Config.NumNodes, results.Config.CreateQPS, results.Config.KubeQPS,
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results.Config.CloudQPS, results.Config.AllocatorType)
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fmt.Fprintf(&b, "\n Succeeded: %v, TotalAllocTime: %v, MaxAllocTime: %v",
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results.Succeeded, time.Duration(results.TotalAllocTime), time.Duration(results.MaxAllocTime))
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fmt.Fprintf(&b, "\n %5s %-20s %-20s %s", "Num", "Node", "PodCIDR", "Duration (s)")
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for i, d := range results.NodeAllocTime {
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fmt.Fprintf(&b, "\n %5d %-20s %-20s %10.3f", i+1, d.Name, d.PodCIDR, time.Duration(d.Duration).Seconds())
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}
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return b.String()
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}
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// MarshalJSON implements the json.Marshaler interface
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func (jDuration *JSONDuration) MarshalJSON() ([]byte, error) {
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return []byte(fmt.Sprintf("\"%s\"", time.Duration(*jDuration).String())), nil
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}
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// UnmarshalJSON implements the json.Unmarshaler interface
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func (jDuration *JSONDuration) UnmarshalJSON(b []byte) (err error) {
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var d time.Duration
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if d, err = time.ParseDuration(string(b[1 : len(b)-1])); err == nil {
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*jDuration = JSONDuration(d)
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}
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return
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}
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