micro/registry/memory/memory.go

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// Package memory provides an in-memory registry
package memory
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import (
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"context"
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"strings"
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"sync"
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"time"
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"github.com/google/uuid"
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"github.com/micro/go-micro/registry"
"github.com/micro/go-micro/util/log"
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)
var (
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sendEventTime = 10 * time.Millisecond
ttlPruneTime = 1 * time.Minute
DefaultTTL = 1 * time.Minute
)
// node tracks node registration timestamp and TTL
type node struct {
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lastSeen time.Time
ttl time.Duration
}
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type Registry struct {
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options registry.Options
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sync.RWMutex
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Services map[string][]*registry.Service
nodes map[string]*node
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Watchers map[string]*Watcher
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}
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func NewRegistry(opts ...registry.Option) registry.Registry {
options := registry.Options{
Context: context.Background(),
}
for _, o := range opts {
o(&options)
}
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services := getServices(options.Context)
if services == nil {
services = make(map[string][]*registry.Service)
}
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reg := &Registry{
options: options,
Services: services,
nodes: make(map[string]*node),
Watchers: make(map[string]*Watcher),
}
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go reg.ttlPrune()
return reg
}
// nodeTrackId returns a string we use to track a node of a given service
func nodeTrackId(svcName, svcVersion, nodeId string) string {
return svcName + "+" + svcVersion + "+" + nodeId
}
func (m *Registry) ttlPrune() {
prune := time.NewTicker(ttlPruneTime)
defer prune.Stop()
for {
select {
case <-prune.C:
m.Lock()
for nodeTrackId, node := range m.nodes {
// if we exceed the TTL threshold we need to stop tracking the node
if time.Since(node.lastSeen) > node.ttl {
// split nodeTrackID into service Name, Version and Node Id
trackIdSplit := strings.Split(nodeTrackId, "+")
svcName, svcVersion, nodeId := trackIdSplit[0], trackIdSplit[1], trackIdSplit[2]
log.Logf("TTL threshold reached for node %s for service %s", nodeId, svcName)
// we need to find a node that expired and delete it from service nodes
if _, ok := m.Services[svcName]; ok {
for _, service := range m.Services[svcName] {
if service.Version != svcVersion {
continue
}
// find expired service node and delete it
var nodes []*registry.Node
for _, n := range service.Nodes {
var del bool
if n.Id == nodeId {
del = true
}
if !del {
nodes = append(nodes, n)
}
}
service.Nodes = nodes
}
}
// stop tracking the node
delete(m.nodes, nodeTrackId)
}
}
m.Unlock()
}
}
return
}
func (m *Registry) sendEvent(r *registry.Result) {
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var watchers []*Watcher
m.RLock()
for _, w := range m.Watchers {
watchers = append(watchers, w)
}
m.RUnlock()
for _, w := range watchers {
select {
case <-w.exit:
m.Lock()
delete(m.Watchers, w.id)
m.Unlock()
default:
select {
case w.res <- r:
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case <-time.After(sendEventTime):
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}
}
}
}
func (m *Registry) Init(opts ...registry.Option) error {
for _, o := range opts {
o(&m.options)
}
// add services
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m.Lock()
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for k, v := range getServices(m.options.Context) {
s := m.Services[k]
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m.Services[k] = registry.Merge(s, v)
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}
m.Unlock()
return nil
}
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func (m *Registry) Options() registry.Options {
return m.options
}
func (m *Registry) GetService(name string) ([]*registry.Service, error) {
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m.RLock()
service, ok := m.Services[name]
m.RUnlock()
if !ok {
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return nil, registry.ErrNotFound
}
return service, nil
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}
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func (m *Registry) ListServices() ([]*registry.Service, error) {
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var services []*registry.Service
m.RLock()
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for _, service := range m.Services {
services = append(services, service...)
}
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m.RUnlock()
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return services, nil
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}
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func (m *Registry) Register(s *registry.Service, opts ...registry.RegisterOption) error {
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m.Lock()
defer m.Unlock()
var options registry.RegisterOptions
for _, o := range opts {
o(&options)
}
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// if no TTL has been set, set it to DefaultTTL
if options.TTL.Seconds() == 0.0 {
options.TTL = DefaultTTL
}
if service, ok := m.Services[s.Name]; !ok {
m.Services[s.Name] = []*registry.Service{s}
// add all nodes into nodes map to track their TTL
for _, n := range s.Nodes {
log.Logf("Tracking node %s for service %s", n.Id, s.Name)
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m.nodes[nodeTrackId(s.Name, s.Version, n.Id)] = &node{
lastSeen: time.Now(),
ttl: options.TTL,
}
}
go m.sendEvent(&registry.Result{Action: "update", Service: s})
} else {
// svcCount essentially keep the count of all service vesions
svcCount := len(service)
// svcNodes maintains a list of node Ids per particular service version
svcNodes := make(map[string]map[string][]string)
// collect all service ids for all service versions
for _, s := range service {
if _, ok := svcNodes[s.Name]; !ok {
svcNodes[s.Name] = make(map[string][]string)
}
if _, ok := svcNodes[s.Name][s.Version]; !ok {
for _, n := range s.Nodes {
svcNodes[s.Name][s.Version] = append(svcNodes[s.Name][s.Version], n.Id)
}
}
}
// if merged count and original service counts changed we know we are adding a new version of the service
merged := registry.Merge(service, []*registry.Service{s})
if len(merged) != svcCount {
m.Services[s.Name] = merged
// we know s is the new [version of] service; we need to strart tracking its nodes
for _, n := range s.Nodes {
log.Logf("Tracking node %s for service %s", n.Id, s.Name)
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m.nodes[nodeTrackId(s.Name, s.Version, n.Id)] = &node{
lastSeen: time.Now(),
ttl: options.TTL,
}
}
go m.sendEvent(&registry.Result{Action: "update", Service: s})
return nil
}
// if the node count of any particular service [version] changed we know we are adding a new node to the service
for _, s := range merged {
// we know that if the node counts have changed we need to track new nodes
if len(s.Nodes) != len(svcNodes[s.Name][s.Version]) {
for _, n := range s.Nodes {
var found bool
for _, id := range svcNodes[s.Name][s.Version] {
if n.Id == id {
found = true
break
}
}
if !found {
log.Logf("Tracking node %s for service %s", n.Id, s.Name)
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m.nodes[nodeTrackId(s.Name, s.Version, n.Id)] = &node{
lastSeen: time.Now(),
ttl: options.TTL,
}
}
}
m.Services[s.Name] = merged
go m.sendEvent(&registry.Result{Action: "update", Service: s})
return nil
}
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// refresh the timestamp and TTL of the service node
for _, n := range s.Nodes {
trackId := nodeTrackId(s.Name, s.Version, n.Id)
log.Logf("Refreshing TTL for node %s for service %s", n.Id, s.Name)
if trackedNode, ok := m.nodes[trackId]; ok {
trackedNode.lastSeen = time.Now()
trackedNode.ttl = options.TTL
}
}
}
}
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return nil
}
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func (m *Registry) Deregister(s *registry.Service) error {
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m.Lock()
defer m.Unlock()
if service, ok := m.Services[s.Name]; ok {
// svcNodes maintains a list of node Ids per particular service version
svcNodes := make(map[string]map[string][]string)
// collect all service ids for all service versions
for _, s := range service {
if _, ok := svcNodes[s.Name]; !ok {
svcNodes[s.Name] = make(map[string][]string)
}
if _, ok := svcNodes[s.Name][s.Version]; !ok {
for _, n := range s.Nodes {
svcNodes[s.Name][s.Version] = append(svcNodes[s.Name][s.Version], n.Id)
}
}
}
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if service := registry.Remove(service, []*registry.Service{s}); len(service) == 0 {
id := svcNodes[s.Name][s.Version][0]
log.Logf("Stopped tracking node %s for service %s", id, s.Name)
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delete(m.nodes, nodeTrackId(s.Name, s.Version, id))
delete(m.Services, s.Name)
} else {
// find out which nodes have been removed
for _, id := range svcNodes[s.Name][s.Version] {
for _, s := range service {
var found bool
for _, n := range s.Nodes {
if id == n.Id {
found = true
break
}
}
if !found {
log.Logf("Stopped tracking node %s for service %s", id, s.Name)
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delete(m.nodes, nodeTrackId(s.Name, s.Version, id))
}
}
m.Services[s.Name] = service
}
}
go m.sendEvent(&registry.Result{Action: "delete", Service: s})
}
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return nil
}
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func (m *Registry) Watch(opts ...registry.WatchOption) (registry.Watcher, error) {
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var wo registry.WatchOptions
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for _, o := range opts {
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o(&wo)
}
w := &Watcher{
exit: make(chan bool),
res: make(chan *registry.Result),
id: uuid.New().String(),
wo: wo,
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}
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m.Lock()
m.Watchers[w.id] = w
m.Unlock()
return w, nil
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}
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func (m *Registry) String() string {
return "memory"
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}