gossip registry
This commit is contained in:
Asim Aslam
parent
d0d8db7c45
commit
57dcba666e
375
registry/gossip/gossip.go
Normal file
375
registry/gossip/gossip.go
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@ -0,0 +1,375 @@
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// Package gossip provides a zero dependency registry using the gossip protocol SWIM
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package gossip
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import (
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"encoding/json"
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"os"
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"strings"
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"sync"
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"time"
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"github.com/golang/protobuf/proto"
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"github.com/google/uuid"
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"github.com/hashicorp/memberlist"
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"github.com/micro/go-log"
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"github.com/micro/go-micro/registry"
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pb "github.com/micro/go-micro/registry/gossip/proto"
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)
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type gossipRegistry struct {
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opts registry.Options
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queue *memberlist.TransmitLimitedQueue
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memberlist *memberlist.Memberlist
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delegate *delegate
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sync.RWMutex
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services map[string][]*registry.Service
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watchers map[string]*watcher
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}
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var (
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defaultPort = 8118
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)
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type broadcast struct {
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update *pb.Update
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notify chan<- struct{}
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}
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type delegate struct {
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queue *memberlist.TransmitLimitedQueue
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registry *gossipRegistry
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}
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func (b *broadcast) Invalidates(other memberlist.Broadcast) bool {
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up := new(pb.Update)
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if err := proto.Unmarshal(other.Message(), up); err != nil {
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return false
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}
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// ids do not match
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if b.update.Id == up.Id {
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return false
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}
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// timestamps do not match
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if b.update.Timestamp != up.Timestamp {
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return false
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}
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// type does not match
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if b.update.Type != up.Type {
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return false
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}
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// invalidates
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return true
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}
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func (b *broadcast) Message() []byte {
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up, err := proto.Marshal(b.update)
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if err != nil {
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return nil
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}
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return up
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}
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func (b *broadcast) Finished() {
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if b.notify != nil {
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close(b.notify)
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}
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}
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func (d *delegate) NodeMeta(limit int) []byte {
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return []byte{}
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}
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func (d *delegate) NotifyMsg(b []byte) {
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if len(b) == 0 {
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return
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}
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up := new(pb.Update)
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if err := proto.Unmarshal(b, up); err != nil {
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return
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}
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// only process service action
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if up.Type != "service" {
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return
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}
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var service *registry.Service
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switch up.Metadata["Content-Type"] {
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case "application/json":
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if err := json.Unmarshal(up.Data, &service); err != nil {
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return
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}
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// no other content type
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default:
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return
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}
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d.registry.Lock()
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defer d.registry.Unlock()
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// get existing service
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s := d.registry.services[service.Name]
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// save update
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switch up.Action {
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case "update":
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d.registry.services[service.Name] = addServices(s, []*registry.Service{service})
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case "delete":
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services := delServices(s, []*registry.Service{service})
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if len(services) == 0 {
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delete(d.registry.services, service.Name)
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return
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}
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d.registry.services[service.Name] = services
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default:
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return
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}
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// notify watchers
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for _, w := range d.registry.watchers {
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select {
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case w.ch <- ®istry.Result{Action: up.Action, Service: service}:
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default:
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}
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}
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}
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func (d *delegate) GetBroadcasts(overhead, limit int) [][]byte {
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return d.queue.GetBroadcasts(overhead, limit)
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}
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func (d *delegate) LocalState(join bool) []byte {
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d.registry.RLock()
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b, _ := json.Marshal(d.registry.services)
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d.registry.RUnlock()
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return b
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}
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func (d *delegate) MergeRemoteState(buf []byte, join bool) {
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if len(buf) == 0 {
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return
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}
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if !join {
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return
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}
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var services map[string][]*registry.Service
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if err := json.Unmarshal(buf, &services); err != nil {
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return
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}
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d.registry.Lock()
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for k, v := range services {
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d.registry.services[k] = addServices(d.registry.services[k], v)
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}
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d.registry.Unlock()
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}
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func (g *gossipRegistry) Init(opts ...registry.Option) error {
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addrs := g.opts.Addrs
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for _, o := range opts {
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o(&g.opts)
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}
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// if we have memberlist join it
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if len(addrs) != len(g.opts.Addrs) {
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_, err := g.memberlist.Join(g.opts.Addrs)
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (g *gossipRegistry) Options() registry.Options {
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return g.opts
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}
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func (g *gossipRegistry) Register(s *registry.Service, opts ...registry.RegisterOption) error {
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b, err := json.Marshal(s)
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if err != nil {
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return err
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}
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g.Lock()
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g.services[s.Name] = addServices(g.services[s.Name], []*registry.Service{s})
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g.Unlock()
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up := &pb.Update{
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Id: uuid.New().String(),
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Timestamp: uint64(time.Now().UnixNano()),
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Action: "update",
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Type: "service",
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Metadata: map[string]string{
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"Content-Type": "application/json",
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},
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Data: b,
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}
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g.queue.QueueBroadcast(&broadcast{
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update: up,
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notify: nil,
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})
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return nil
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}
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func (g *gossipRegistry) Deregister(s *registry.Service) error {
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b, err := json.Marshal(s)
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if err != nil {
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return err
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}
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g.Lock()
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g.services[s.Name] = delServices(g.services[s.Name], []*registry.Service{s})
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g.Unlock()
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up := &pb.Update{
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Id: uuid.New().String(),
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Timestamp: uint64(time.Now().UnixNano()),
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Action: "delete",
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Type: "service",
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Metadata: map[string]string{
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"Content-Type": "application/json",
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},
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Data: b,
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}
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g.queue.QueueBroadcast(&broadcast{
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update: up,
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notify: nil,
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})
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return nil
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}
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func (g *gossipRegistry) GetService(name string) ([]*registry.Service, error) {
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g.RLock()
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if s, ok := g.services[name]; ok {
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service := cp(s)
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g.RUnlock()
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return service, nil
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}
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g.RUnlock()
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return nil, registry.ErrNotFound
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}
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func (g *gossipRegistry) ListServices() ([]*registry.Service, error) {
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var services []*registry.Service
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g.RLock()
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for name, _ := range g.services {
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services = append(services, ®istry.Service{Name: name})
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}
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g.RUnlock()
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return services, nil
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}
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func (g *gossipRegistry) Watch(opts ...registry.WatchOption) (registry.Watcher, error) {
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var options registry.WatchOptions
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for _, o := range opts {
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o(&options)
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}
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// watcher id
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id := uuid.New().String()
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// create watcher
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w := &watcher{
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ch: make(chan *registry.Result, 1),
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exit: make(chan bool),
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id: id,
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// filter service
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srv: options.Service,
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// delete self
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fn: func() {
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g.Lock()
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delete(g.watchers, id)
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g.Unlock()
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},
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}
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// save watcher
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g.Lock()
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g.watchers[w.id] = w
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g.Unlock()
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return w, nil
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}
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func (g *gossipRegistry) String() string {
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return "gossip"
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}
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func (g *gossipRegistry) run() error {
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hostname, _ := os.Hostname()
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// delegates
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d := new(delegate)
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// create a new default config
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c := memberlist.DefaultLocalConfig()
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// assign the delegate
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c.Delegate = d
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// Set the bind port
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c.BindPort = defaultPort
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// set the name
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c.Name = strings.Join([]string{"micro", hostname, uuid.New().String()}, "-")
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// TODO: set advertise addr to advertise behind nat
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// create the memberlist
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m, err := memberlist.Create(c)
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if err != nil {
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return err
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}
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// if we have memberlist join it
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if len(g.opts.Addrs) > 0 {
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_, err := m.Join(g.opts.Addrs)
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if err != nil {
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return err
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}
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}
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// Set the broadcast limit and number of nodes
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d.queue = &memberlist.TransmitLimitedQueue{
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NumNodes: func() int {
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return m.NumMembers()
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},
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RetransmitMult: 3,
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}
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g.memberlist = m
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g.delegate = d
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d.registry = g
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return nil
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}
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// NewRegistry returns a new gossip registry
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func NewRegistry(opts ...registry.Option) registry.Registry {
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var options registry.Options
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for _, o := range opts {
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o(&options)
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}
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g := &gossipRegistry{
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opts: options,
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}
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if err := g.run(); err != nil {
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log.Fatal(err)
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}
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// return gossip registry
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return g
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}
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28
registry/gossip/proto/gossip.micro.go
Normal file
28
registry/gossip/proto/gossip.micro.go
Normal file
@ -0,0 +1,28 @@
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// Code generated by protoc-gen-micro. DO NOT EDIT.
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// source: github.com/micro/go-micro/registry/gossip/proto/gossip.proto
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/*
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Package gossip is a generated protocol buffer package.
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It is generated from these files:
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github.com/micro/go-micro/registry/gossip/proto/gossip.proto
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It has these top-level messages:
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Update
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*/
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package gossip
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import proto "github.com/golang/protobuf/proto"
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import fmt "fmt"
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import math "math"
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// Reference imports to suppress errors if they are not otherwise used.
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var _ = proto.Marshal
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var _ = fmt.Errorf
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var _ = math.Inf
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// This is a compile-time assertion to ensure that this generated file
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// is compatible with the proto package it is being compiled against.
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// A compilation error at this line likely means your copy of the
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// proto package needs to be updated.
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const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
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118
registry/gossip/proto/gossip.pb.go
Normal file
118
registry/gossip/proto/gossip.pb.go
Normal file
@ -0,0 +1,118 @@
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// Code generated by protoc-gen-go. DO NOT EDIT.
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// source: github.com/micro/go-micro/registry/gossip/proto/gossip.proto
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/*
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Package gossip is a generated protocol buffer package.
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It is generated from these files:
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github.com/micro/go-micro/registry/gossip/proto/gossip.proto
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It has these top-level messages:
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Update
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*/
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package gossip
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import proto "github.com/golang/protobuf/proto"
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import fmt "fmt"
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import math "math"
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// Reference imports to suppress errors if they are not otherwise used.
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var _ = proto.Marshal
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var _ = fmt.Errorf
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var _ = math.Inf
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// This is a compile-time assertion to ensure that this generated file
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// is compatible with the proto package it is being compiled against.
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// A compilation error at this line likely means your copy of the
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// proto package needs to be updated.
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const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
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// Update is the message broadcast
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type Update struct {
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// unique id of update
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Id string `protobuf:"bytes,1,opt,name=id" json:"id,omitempty"`
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// unix nano timestamp of update
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Timestamp uint64 `protobuf:"varint,2,opt,name=timestamp" json:"timestamp,omitempty"`
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// type of update; service
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Type string `protobuf:"bytes,3,opt,name=type" json:"type,omitempty"`
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// what action is taken; add, del, put
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Action string `protobuf:"bytes,4,opt,name=action" json:"action,omitempty"`
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// any other associated metadata about the data
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Metadata map[string]string `protobuf:"bytes,5,rep,name=metadata" json:"metadata,omitempty" protobuf_key:"bytes,1,opt,name=key" protobuf_val:"bytes,2,opt,name=value"`
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// the payload data;
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Data []byte `protobuf:"bytes,6,opt,name=data,proto3" json:"data,omitempty"`
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}
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func (m *Update) Reset() { *m = Update{} }
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func (m *Update) String() string { return proto.CompactTextString(m) }
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func (*Update) ProtoMessage() {}
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func (*Update) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{0} }
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func (m *Update) GetId() string {
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if m != nil {
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return m.Id
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}
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return ""
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}
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func (m *Update) GetTimestamp() uint64 {
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if m != nil {
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return m.Timestamp
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}
|
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return 0
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}
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|
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func (m *Update) GetType() string {
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if m != nil {
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return m.Type
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}
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return ""
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}
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func (m *Update) GetAction() string {
|
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if m != nil {
|
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return m.Action
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}
|
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return ""
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}
|
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|
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func (m *Update) GetMetadata() map[string]string {
|
||||
if m != nil {
|
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return m.Metadata
|
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}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (m *Update) GetData() []byte {
|
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if m != nil {
|
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return m.Data
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func init() {
|
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proto.RegisterType((*Update)(nil), "gossip.Update")
|
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}
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||||
|
||||
func init() {
|
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proto.RegisterFile("github.com/micro/go-micro/registry/gossip/proto/gossip.proto", fileDescriptor0)
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}
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var fileDescriptor0 = []byte{
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||||
// 237 bytes of a gzipped FileDescriptorProto
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||||
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|
||||
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|
||||
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|
||||
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|
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|
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|
||||
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||||
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||||
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|
||||
0x70, 0x35, 0x90, 0x71, 0x07, 0x51, 0xc5, 0x69, 0x36, 0xdc, 0xc1, 0x89, 0xd5, 0xa4, 0x46, 0x45,
|
||||
0x4a, 0x6c, 0x9a, 0xb2, 0x3d, 0xbd, 0xdf, 0x76, 0xb9, 0x4d, 0xda, 0xdd, 0xbd, 0xe6, 0xe7, 0x97,
|
||||
0x03, 0x85, 0x45, 0xfe, 0xa6, 0xd7, 0x2d, 0xf1, 0x17, 0x6f, 0x58, 0x7b, 0x26, 0x23, 0xdf, 0x3c,
|
||||
0xc1, 0xf9, 0xbf, 0x38, 0x5e, 0x42, 0xf9, 0xa1, 0x97, 0xdc, 0x7c, 0x45, 0xbc, 0x82, 0xcd, 0x97,
|
||||
0xfa, 0x3c, 0xea, 0x58, 0xbb, 0x96, 0x49, 0x1e, 0x8b, 0x1d, 0xdb, 0xf3, 0x78, 0xfe, 0xc3, 0x4f,
|
||||
0x00, 0x00, 0x00, 0xff, 0xff, 0xf0, 0x49, 0xa9, 0xd7, 0x3e, 0x01, 0x00, 0x00,
|
||||
}
|
||||
19
registry/gossip/proto/gossip.proto
Normal file
19
registry/gossip/proto/gossip.proto
Normal file
@ -0,0 +1,19 @@
|
||||
syntax = "proto3";
|
||||
|
||||
package gossip;
|
||||
|
||||
// Update is the message broadcast
|
||||
message Update {
|
||||
// unique id of update
|
||||
string id = 1;
|
||||
// unix nano timestamp of update
|
||||
uint64 timestamp = 2;
|
||||
// type of update; service
|
||||
string type = 3;
|
||||
// what action is taken; add, del, put
|
||||
string action = 4;
|
||||
// any other associated metadata about the data
|
||||
map<string, string> metadata = 5;
|
||||
// the payload data;
|
||||
bytes data = 6;
|
||||
}
|
||||
109
registry/gossip/util.go
Normal file
109
registry/gossip/util.go
Normal file
@ -0,0 +1,109 @@
|
||||
package gossip
|
||||
|
||||
import (
|
||||
"github.com/micro/go-micro/registry"
|
||||
)
|
||||
|
||||
func cp(current []*registry.Service) []*registry.Service {
|
||||
var services []*registry.Service
|
||||
|
||||
for _, service := range current {
|
||||
// copy service
|
||||
s := new(registry.Service)
|
||||
*s = *service
|
||||
|
||||
// copy nodes
|
||||
var nodes []*registry.Node
|
||||
for _, node := range service.Nodes {
|
||||
n := new(registry.Node)
|
||||
*n = *node
|
||||
nodes = append(nodes, n)
|
||||
}
|
||||
s.Nodes = nodes
|
||||
|
||||
// copy endpoints
|
||||
var eps []*registry.Endpoint
|
||||
for _, ep := range service.Endpoints {
|
||||
e := new(registry.Endpoint)
|
||||
*e = *ep
|
||||
eps = append(eps, e)
|
||||
}
|
||||
s.Endpoints = eps
|
||||
|
||||
// append service
|
||||
services = append(services, s)
|
||||
}
|
||||
|
||||
return services
|
||||
}
|
||||
|
||||
func addNodes(old, neu []*registry.Node) []*registry.Node {
|
||||
for _, n := range neu {
|
||||
var seen bool
|
||||
for i, o := range old {
|
||||
if o.Id == n.Id {
|
||||
seen = true
|
||||
old[i] = n
|
||||
break
|
||||
}
|
||||
}
|
||||
if !seen {
|
||||
old = append(old, n)
|
||||
}
|
||||
}
|
||||
return old
|
||||
}
|
||||
|
||||
func addServices(old, neu []*registry.Service) []*registry.Service {
|
||||
for _, s := range neu {
|
||||
var seen bool
|
||||
for i, o := range old {
|
||||
if o.Version == s.Version {
|
||||
s.Nodes = addNodes(o.Nodes, s.Nodes)
|
||||
seen = true
|
||||
old[i] = s
|
||||
break
|
||||
}
|
||||
}
|
||||
if !seen {
|
||||
old = append(old, s)
|
||||
}
|
||||
}
|
||||
return old
|
||||
}
|
||||
|
||||
func delNodes(old, del []*registry.Node) []*registry.Node {
|
||||
var nodes []*registry.Node
|
||||
for _, o := range old {
|
||||
var rem bool
|
||||
for _, n := range del {
|
||||
if o.Id == n.Id {
|
||||
rem = true
|
||||
break
|
||||
}
|
||||
}
|
||||
if !rem {
|
||||
nodes = append(nodes, o)
|
||||
}
|
||||
}
|
||||
return nodes
|
||||
}
|
||||
|
||||
func delServices(old, del []*registry.Service) []*registry.Service {
|
||||
var services []*registry.Service
|
||||
for i, o := range old {
|
||||
var rem bool
|
||||
for _, s := range del {
|
||||
if o.Version == s.Version {
|
||||
old[i].Nodes = delNodes(o.Nodes, s.Nodes)
|
||||
if len(old[i].Nodes) == 0 {
|
||||
rem = true
|
||||
}
|
||||
}
|
||||
}
|
||||
if !rem {
|
||||
services = append(services, o)
|
||||
}
|
||||
}
|
||||
return services
|
||||
}
|
||||
78
registry/gossip/util_test.go
Normal file
78
registry/gossip/util_test.go
Normal file
@ -0,0 +1,78 @@
|
||||
package gossip
|
||||
|
||||
import (
|
||||
"testing"
|
||||
|
||||
"github.com/micro/go-micro/registry"
|
||||
)
|
||||
|
||||
func TestDelServices(t *testing.T) {
|
||||
services := []*registry.Service{
|
||||
{
|
||||
Name: "foo",
|
||||
Version: "1.0.0",
|
||||
Nodes: []*registry.Node{
|
||||
{
|
||||
Id: "foo-123",
|
||||
Address: "localhost",
|
||||
Port: 9999,
|
||||
},
|
||||
},
|
||||
},
|
||||
{
|
||||
Name: "foo",
|
||||
Version: "1.0.0",
|
||||
Nodes: []*registry.Node{
|
||||
{
|
||||
Id: "foo-123",
|
||||
Address: "localhost",
|
||||
Port: 6666,
|
||||
},
|
||||
},
|
||||
},
|
||||
}
|
||||
|
||||
servs := delServices([]*registry.Service{services[0]}, []*registry.Service{services[1]})
|
||||
if i := len(servs); i > 0 {
|
||||
t.Errorf("Expected 0 nodes, got %d: %+v", i, servs)
|
||||
}
|
||||
t.Logf("Services %+v", servs)
|
||||
}
|
||||
|
||||
func TestDelNodes(t *testing.T) {
|
||||
services := []*registry.Service{
|
||||
{
|
||||
Name: "foo",
|
||||
Version: "1.0.0",
|
||||
Nodes: []*registry.Node{
|
||||
{
|
||||
Id: "foo-123",
|
||||
Address: "localhost",
|
||||
Port: 9999,
|
||||
},
|
||||
{
|
||||
Id: "foo-321",
|
||||
Address: "localhost",
|
||||
Port: 6666,
|
||||
},
|
||||
},
|
||||
},
|
||||
{
|
||||
Name: "foo",
|
||||
Version: "1.0.0",
|
||||
Nodes: []*registry.Node{
|
||||
{
|
||||
Id: "foo-123",
|
||||
Address: "localhost",
|
||||
Port: 6666,
|
||||
},
|
||||
},
|
||||
},
|
||||
}
|
||||
|
||||
nodes := delNodes(services[0].Nodes, services[1].Nodes)
|
||||
if i := len(nodes); i != 1 {
|
||||
t.Errorf("Expected only 1 node, got %d: %+v", i, nodes)
|
||||
}
|
||||
t.Logf("Nodes %+v", nodes)
|
||||
}
|
||||
40
registry/gossip/watcher.go
Normal file
40
registry/gossip/watcher.go
Normal file
@ -0,0 +1,40 @@
|
||||
package gossip
|
||||
|
||||
import (
|
||||
"github.com/micro/go-micro/registry"
|
||||
)
|
||||
|
||||
type watcher struct {
|
||||
id string
|
||||
srv string
|
||||
ch chan *registry.Result
|
||||
exit chan bool
|
||||
fn func()
|
||||
}
|
||||
|
||||
func (w *watcher) Next() (*registry.Result, error) {
|
||||
for {
|
||||
select {
|
||||
case r := <-w.ch:
|
||||
if r.Service == nil {
|
||||
continue
|
||||
}
|
||||
if len(w.srv) > 0 && (r.Service.Name != w.srv) {
|
||||
continue
|
||||
}
|
||||
return r, nil
|
||||
case <-w.exit:
|
||||
return nil, registry.ErrWatcherStopped
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func (w *watcher) Stop() {
|
||||
select {
|
||||
case <-w.exit:
|
||||
return
|
||||
default:
|
||||
close(w.exit)
|
||||
w.fn()
|
||||
}
|
||||
}
|
||||
5
registry/gossip/watcher_test.go
Normal file
5
registry/gossip/watcher_test.go
Normal file
@ -0,0 +1,5 @@
|
||||
package gossip
|
||||
|
||||
func TestWatcher(t *testing.T) {
|
||||
w := newWatcher()
|
||||
}
|
||||
@ -28,7 +28,10 @@ type WatchOption func(*WatchOptions)
|
||||
var (
|
||||
DefaultRegistry = newConsulRegistry()
|
||||
|
||||
// Not found error when GetService is called
|
||||
ErrNotFound = errors.New("not found")
|
||||
// Watcher stopped error when watcher is stopped
|
||||
ErrWatcherStopped = errors.New("watcher stopped")
|
||||
)
|
||||
|
||||
func NewRegistry(opts ...Option) Registry {
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user