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Find file Copy path
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@milosgajdos83 @asim @vtolstov @tegk @erikh
284 lines (238 sloc) 5.87 KB
// Package memory provides an in-memory registry
package memory
import (
"context"
"sync"
"time"
"github.com/google/uuid"
"github.com/micro/go-micro/registry"
"github.com/micro/go-micro/util/log"
)
var (
sendEventTime = 10 * time.Millisecond
ttlPruneTime = time.Second
)
type node struct {
*registry.Node
TTL time.Duration
LastSeen time.Time
}
type record struct {
Name string
Version string
Metadata map[string]string
Nodes map[string]*node
Endpoints []*registry.Endpoint
}
type Registry struct {
options registry.Options
sync.RWMutex
records map[string]map[string]*record
watchers map[string]*Watcher
}
func NewRegistry(opts ...registry.Option) registry.Registry {
options := registry.Options{
Context: context.Background(),
}
for _, o := range opts {
o(&options)
}
records := getServiceRecords(options.Context)
if records == nil {
records = make(map[string]map[string]*record)
}
reg := &Registry{
options: options,
records: records,
watchers: make(map[string]*Watcher),
}
go reg.ttlPrune()
return reg
}
func (m *Registry) ttlPrune() {
prune := time.NewTicker(ttlPruneTime)
defer prune.Stop()
for {
select {
case <-prune.C:
m.Lock()
for name, records := range m.records {
for version, record := range records {
for id, n := range record.Nodes {
if n.TTL != 0 && time.Since(n.LastSeen) > n.TTL {
log.Debugf("Registry TTL expired for node %s of service %s", n.Id, name)
delete(m.records[name][version].Nodes, id)
}
}
}
}
m.Unlock()
}
}
}
func (m *Registry) sendEvent(r *registry.Result) {
m.RLock()
watchers := make([]*Watcher, 0, len(m.watchers))
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:
case <-time.After(sendEventTime):
}
}
}
}
func (m *Registry) Init(opts ...registry.Option) error {
for _, o := range opts {
o(&m.options)
}
// add services
m.Lock()
defer m.Unlock()
records := getServiceRecords(m.options.Context)
for name, record := range records {
// add a whole new service including all of its versions
if _, ok := m.records[name]; !ok {
m.records[name] = record
continue
}
// add the versions of the service we dont track yet
for version, r := range record {
if _, ok := m.records[name][version]; !ok {
m.records[name][version] = r
continue
}
}
}
return nil
}
func (m *Registry) Options() registry.Options {
return m.options
}
func (m *Registry) Register(s *registry.Service, opts ...registry.RegisterOption) error {
m.Lock()
defer m.Unlock()
var options registry.RegisterOptions
for _, o := range opts {
o(&options)
}
r := serviceToRecord(s, options.TTL)
if _, ok := m.records[s.Name]; !ok {
m.records[s.Name] = make(map[string]*record)
}
if _, ok := m.records[s.Name][s.Version]; !ok {
m.records[s.Name][s.Version] = r
log.Debugf("Registry added new service: %s, version: %s", s.Name, s.Version)
go m.sendEvent(&registry.Result{Action: "update", Service: s})
return nil
}
addedNodes := false
for _, n := range s.Nodes {
if _, ok := m.records[s.Name][s.Version].Nodes[n.Id]; !ok {
addedNodes = true
metadata := make(map[string]string)
for k, v := range n.Metadata {
metadata[k] = v
m.records[s.Name][s.Version].Nodes[n.Id] = &node{
Node: &registry.Node{
Id: n.Id,
Address: n.Address,
Metadata: metadata,
},
TTL: options.TTL,
LastSeen: time.Now(),
}
}
}
}
if addedNodes {
log.Debugf("Registry added new node to service: %s, version: %s", s.Name, s.Version)
go m.sendEvent(&registry.Result{Action: "update", Service: s})
return nil
}
// refresh TTL and timestamp
for _, n := range s.Nodes {
log.Debugf("Updated registration for service: %s, version: %s", s.Name, s.Version)
m.records[s.Name][s.Version].Nodes[n.Id].TTL = options.TTL
m.records[s.Name][s.Version].Nodes[n.Id].LastSeen = time.Now()
}
return nil
}
func (m *Registry) Deregister(s *registry.Service) error {
m.Lock()
defer m.Unlock()
if _, ok := m.records[s.Name]; ok {
if _, ok := m.records[s.Name][s.Version]; ok {
for _, n := range s.Nodes {
if _, ok := m.records[s.Name][s.Version].Nodes[n.Id]; ok {
log.Debugf("Registry removed node from service: %s, version: %s", s.Name, s.Version)
delete(m.records[s.Name][s.Version].Nodes, n.Id)
}
}
if len(m.records[s.Name][s.Version].Nodes) == 0 {
delete(m.records[s.Name], s.Version)
log.Debugf("Registry removed service: %s, version: %s", s.Name, s.Version)
}
}
if len(m.records[s.Name]) == 0 {
delete(m.records, s.Name)
log.Debugf("Registry removed service: %s", s.Name)
}
go m.sendEvent(&registry.Result{Action: "delete", Service: s})
}
return nil
}
func (m *Registry) GetService(name string) ([]*registry.Service, error) {
m.RLock()
defer m.RUnlock()
records, ok := m.records[name]
if !ok {
return nil, registry.ErrNotFound
}
services := make([]*registry.Service, len(m.records[name]))
i := 0
for _, record := range records {
services[i] = recordToService(record)
i++
}
return services, nil
}
func (m *Registry) ListServices() ([]*registry.Service, error) {
m.RLock()
defer m.RUnlock()
var services []*registry.Service
for _, records := range m.records {
for _, record := range records {
services = append(services, recordToService(record))
}
}
return services, nil
}
func (m *Registry) Watch(opts ...registry.WatchOption) (registry.Watcher, error) {
var wo registry.WatchOptions
for _, o := range opts {
o(&wo)
}
w := &Watcher{
exit: make(chan bool),
res: make(chan *registry.Result),
id: uuid.New().String(),
wo: wo,
}
m.Lock()
m.watchers[w.id] = w
m.Unlock()
return w, nil
}
func (m *Registry) String() string {
return "memory"
}
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