Next phase of selector
This commit is contained in:
parent
ba391e228c
commit
77e4d4d9c4
@ -1,182 +0,0 @@
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package blacklist
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import (
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"math/rand"
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"sync"
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"time"
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"github.com/micro/go-micro/registry"
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"github.com/micro/go-micro/selector"
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)
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type blackListNode struct {
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age time.Time
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id string
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service string
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}
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type blackListSelector struct {
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so selector.Options
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ttl int64
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exit chan bool
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once sync.Once
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sync.RWMutex
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bl map[string]blackListNode
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}
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func init() {
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rand.Seed(time.Now().Unix())
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}
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func (r *blackListSelector) purge() {
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now := time.Now()
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r.Lock()
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for k, v := range r.bl {
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if d := v.age.Sub(now); d.Seconds() < 0 {
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delete(r.bl, k)
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}
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}
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r.Unlock()
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}
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func (r *blackListSelector) run() {
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t := time.NewTicker(time.Duration(r.ttl) * time.Second)
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for {
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select {
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case <-r.exit:
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t.Stop()
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return
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case <-t.C:
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r.purge()
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}
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}
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}
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func (r *blackListSelector) Init(opts ...selector.Option) error {
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for _, o := range opts {
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o(&r.so)
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}
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return nil
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}
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func (r *blackListSelector) Options() selector.Options {
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return r.so
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}
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func (r *blackListSelector) Select(service string, opts ...selector.SelectOption) (selector.Next, error) {
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var sopts selector.SelectOptions
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for _, opt := range opts {
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opt(&sopts)
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}
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// get the service
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services, err := r.so.Registry.GetService(service)
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if err != nil {
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return nil, err
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}
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// apply the filters
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for _, filter := range sopts.Filters {
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services = filter(services)
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}
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// if there's nothing left, return
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if len(services) == 0 {
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return nil, selector.ErrNotFound
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}
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var nodes []*registry.Node
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for _, service := range services {
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for _, node := range service.Nodes {
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nodes = append(nodes, node)
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}
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}
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if len(nodes) == 0 {
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return nil, selector.ErrNotFound
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}
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return func() (*registry.Node, error) {
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var viable []*registry.Node
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r.RLock()
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for _, node := range nodes {
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if _, ok := r.bl[node.Id]; !ok {
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viable = append(viable, node)
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}
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}
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r.RUnlock()
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if len(viable) == 0 {
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return nil, selector.ErrNoneAvailable
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}
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return viable[rand.Int()%len(viable)], nil
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}, nil
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}
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func (r *blackListSelector) Mark(service string, node *registry.Node, err error) {
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r.Lock()
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defer r.Unlock()
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if err == nil {
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delete(r.bl, node.Id)
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return
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}
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r.bl[node.Id] = blackListNode{
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age: time.Now().Add(time.Duration(r.ttl) * time.Second),
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id: node.Id,
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service: service,
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}
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return
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}
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func (r *blackListSelector) Reset(service string) {
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r.Lock()
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defer r.Unlock()
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for k, v := range r.bl {
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if v.service == service {
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delete(r.bl, k)
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}
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}
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return
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}
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func (r *blackListSelector) Close() error {
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r.once.Do(func() {
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close(r.exit)
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})
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return nil
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}
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func (r *blackListSelector) String() string {
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return "blacklist"
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}
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func NewSelector(opts ...selector.Option) selector.Selector {
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var sopts selector.Options
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for _, opt := range opts {
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opt(&sopts)
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}
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if sopts.Registry == nil {
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sopts.Registry = registry.DefaultRegistry
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}
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var once sync.Once
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bl := &blackListSelector{
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once: once,
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so: sopts,
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ttl: 60,
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bl: make(map[string]blackListNode),
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exit: make(chan bool),
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}
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go bl.run()
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return bl
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}
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@ -1,73 +0,0 @@
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package blacklist
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import (
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"errors"
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"testing"
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"time"
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"github.com/micro/go-micro/registry/mock"
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"github.com/micro/go-micro/selector"
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)
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func TestBlackListSelector(t *testing.T) {
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counts := map[string]int{}
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bl := &blackListSelector{
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so: selector.Options{
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Registry: mock.NewRegistry(),
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},
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ttl: 2,
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bl: make(map[string]blackListNode),
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exit: make(chan bool),
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}
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go bl.run()
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defer bl.Close()
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next, err := bl.Select("foo")
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if err != nil {
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t.Errorf("Unexpected error calling bl select: %v", err)
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}
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for i := 0; i < 100; i++ {
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node, err := next()
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if err != nil {
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t.Errorf("Expected node err, got err: %v", err)
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}
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counts[node.Id]++
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}
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t.Logf("BlackList Counts %v", counts)
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// test blacklisting
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for i := 0; i < 4; i++ {
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node, err := next()
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if err != nil {
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t.Errorf("Expected node err, got err: %v", err)
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}
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bl.Mark("foo", node, errors.New("blacklist"))
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}
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if node, err := next(); err != selector.ErrNoneAvailable {
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t.Errorf("Expected none available err, got node %v err %v", node, err)
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}
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time.Sleep(time.Second * time.Duration(bl.ttl) * 2)
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if _, err := next(); err != nil {
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t.Errorf("Unexpected err %v", err)
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}
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// test resetting
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for i := 0; i < 4; i++ {
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node, err := next()
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if err != nil {
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t.Errorf("Unexpected err: %v", err)
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}
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bl.Mark("foo", node, errors.New("blacklist"))
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}
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if node, err := next(); err != selector.ErrNoneAvailable {
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t.Errorf("Expected none available err, got node %v err %v", node, err)
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}
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bl.Reset("foo")
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if _, err := next(); err != nil {
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t.Errorf("Unexpected err %v", err)
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}
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}
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@ -5,16 +5,33 @@ import (
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"time"
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"github.com/micro/go-micro/registry"
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"github.com/micro/go-micro/selector/internal/blacklist"
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)
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type defaultSelector struct {
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so Options
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so Options
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exit chan bool
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bl *blacklist.BlackList
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}
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func init() {
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rand.Seed(time.Now().Unix())
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}
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func (r *defaultSelector) run() {
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t := time.NewTicker(time.Second * 30)
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for {
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select {
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case <-t.C:
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// TODO
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case <-r.exit:
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t.Stop()
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return
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}
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}
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}
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func (r *defaultSelector) Init(opts ...Option) error {
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for _, o := range opts {
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o(&r.so)
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@ -46,6 +63,12 @@ func (r *defaultSelector) Select(service string, opts ...SelectOption) (Next, er
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services = filter(services)
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}
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// apply the blacklist
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services, err = r.bl.Filter(services)
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if err != nil {
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return nil, err
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}
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// if there's nothing left, return
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if len(services) == 0 {
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return nil, ErrNotFound
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@ -55,14 +78,21 @@ func (r *defaultSelector) Select(service string, opts ...SelectOption) (Next, er
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}
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func (r *defaultSelector) Mark(service string, node *registry.Node, err error) {
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return
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r.bl.Mark(service, node, err)
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}
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func (r *defaultSelector) Reset(service string) {
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return
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r.bl.Reset(service)
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}
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func (r *defaultSelector) Close() error {
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select {
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case <-r.exit:
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return nil
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default:
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close(r.exit)
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r.bl.Close()
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}
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return nil
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}
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@ -83,5 +113,12 @@ func newDefaultSelector(opts ...Option) Selector {
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sopts.Registry = registry.DefaultRegistry
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}
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return &defaultSelector{sopts}
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se := &defaultSelector{
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so: sopts,
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exit: make(chan bool),
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bl: blacklist.New(),
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}
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go se.run()
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return se
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}
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164
selector/internal/blacklist/blacklist.go
Normal file
164
selector/internal/blacklist/blacklist.go
Normal file
@ -0,0 +1,164 @@
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package blacklist
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import (
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"math/rand"
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"sync"
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"time"
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"github.com/micro/go-micro/registry"
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)
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type blackListNode struct {
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age time.Time
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id string
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service string
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count int
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}
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type BlackList struct {
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ttl int
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exit chan bool
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sync.RWMutex
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bl map[string]blackListNode
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}
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var (
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// number of times we see an error before blacklisting
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count = 3
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// the ttl to blacklist for
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ttl = 30
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)
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func init() {
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rand.Seed(time.Now().Unix())
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}
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func (r *BlackList) purge() {
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now := time.Now()
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r.Lock()
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for k, v := range r.bl {
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if d := v.age.Sub(now); d.Seconds() < 0 {
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delete(r.bl, k)
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}
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}
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r.Unlock()
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}
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func (r *BlackList) run() {
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t := time.NewTicker(time.Duration(r.ttl) * time.Second)
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for {
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select {
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case <-r.exit:
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t.Stop()
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return
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case <-t.C:
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r.purge()
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}
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}
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}
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func (r *BlackList) Filter(services []*registry.Service) ([]*registry.Service, error) {
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var viableServices []*registry.Service
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r.RLock()
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for _, service := range services {
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var viableNodes []*registry.Node
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for _, node := range service.Nodes {
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n, ok := r.bl[node.Id]
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if !ok {
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// blacklist miss so add it
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viableNodes = append(viableNodes, node)
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continue
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}
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// got some blacklist info
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// skip the node if it exceeds count
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if n.count >= count {
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continue
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}
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// doesn't exceed count, still viable
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viableNodes = append(viableNodes, node)
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}
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if len(viableNodes) == 0 {
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continue
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}
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viableService := new(registry.Service)
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*viableService = *service
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viableService.Nodes = viableNodes
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viableServices = append(viableServices, viableService)
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}
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r.RUnlock()
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return viableServices, nil
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}
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func (r *BlackList) Mark(service string, node *registry.Node, err error) {
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r.Lock()
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defer r.Unlock()
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// reset when error is nil
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// basically closing the circuit
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if err == nil {
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delete(r.bl, node.Id)
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return
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}
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n, ok := r.bl[node.Id]
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if !ok {
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n = blackListNode{
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id: node.Id,
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service: service,
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}
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}
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// mark it
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n.count++
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// set age to ttl seconds in future
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n.age = time.Now().Add(time.Duration(r.ttl) * time.Second)
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// save
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r.bl[node.Id] = n
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}
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func (r *BlackList) Reset(service string) {
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r.Lock()
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defer r.Unlock()
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for k, v := range r.bl {
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// delete every node that matches the service
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if v.service == service {
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delete(r.bl, k)
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}
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}
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}
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func (r *BlackList) Close() error {
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select {
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case <-r.exit:
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return nil
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default:
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close(r.exit)
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}
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return nil
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}
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func New() *BlackList {
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bl := &BlackList{
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ttl: ttl,
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bl: make(map[string]blackListNode),
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exit: make(chan bool),
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}
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go bl.run()
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return bl
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}
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107
selector/internal/blacklist/blacklist_test.go
Normal file
107
selector/internal/blacklist/blacklist_test.go
Normal file
@ -0,0 +1,107 @@
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package blacklist
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import (
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"errors"
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"testing"
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"time"
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"github.com/micro/go-micro/registry"
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)
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func TestBlackList(t *testing.T) {
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bl := &BlackList{
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ttl: 1,
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bl: make(map[string]blackListNode),
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exit: make(chan bool),
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}
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go bl.run()
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defer bl.Close()
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services := []*registry.Service{
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®istry.Service{
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Name: "foo",
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Nodes: []*registry.Node{
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®istry.Node{
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Id: "foo-1",
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Address: "localhost",
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Port: 10001,
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},
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®istry.Node{
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Id: "foo-2",
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Address: "localhost",
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Port: 10002,
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},
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®istry.Node{
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Id: "foo-3",
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Address: "localhost",
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Port: 10002,
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},
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},
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},
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}
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// check nothing is filtered on clean run
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filterTest := func() {
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for i := 0; i < 3; i++ {
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srvs, err := bl.Filter(services)
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if err != nil {
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t.Fatal(err)
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}
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if len(srvs) != len(services) {
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t.Fatal("nodes were filtered when they shouldn't be")
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}
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for _, node := range srvs[0].Nodes {
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var seen bool
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for _, n := range srvs[0].Nodes {
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if n.Id == node.Id {
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seen = true
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break
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}
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}
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if !seen {
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t.Fatalf("Missing node %s", node.Id)
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}
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}
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}
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}
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// run filter test
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filterTest()
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blacklistTest := func() {
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// test blacklisting
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// mark until failure
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for i := 0; i < count+1; i++ {
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for _, node := range services[0].Nodes {
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bl.Mark("foo", node, errors.New("blacklist"))
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}
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}
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||||
filtered, err := bl.Filter(services)
|
||||
if err != nil {
|
||||
t.Fatal(err)
|
||||
}
|
||||
|
||||
if len(filtered) > 0 {
|
||||
t.Fatalf("Expected zero nodes got %+v", filtered)
|
||||
}
|
||||
}
|
||||
|
||||
// sleep the ttl duration
|
||||
time.Sleep(time.Second * time.Duration(bl.ttl) * 2)
|
||||
|
||||
// now run filterTest again
|
||||
filterTest()
|
||||
|
||||
// run the blacklist test
|
||||
blacklistTest()
|
||||
|
||||
// reset
|
||||
bl.Reset("foo")
|
||||
|
||||
// check again
|
||||
filterTest()
|
||||
}
|
Loading…
Reference in New Issue
Block a user