micro/registry/etcd/etcd.go

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package etcd
import (
"encoding/json"
"errors"
"path/filepath"
"strings"
"sync"
etcd "github.com/coreos/etcd/client"
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"github.com/myodc/go-micro/registry"
"golang.org/x/net/context"
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)
var (
prefix = "/micro-registry"
)
type etcdRegistry struct {
client etcd.KeysAPI
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sync.RWMutex
services map[string]*registry.Service
}
func encode(s *registry.Service) string {
b, _ := json.Marshal(s)
return string(b)
}
func decode(ds string) *registry.Service {
var s *registry.Service
json.Unmarshal([]byte(ds), &s)
return s
}
func nodePath(s, id string) string {
service := strings.Replace(s, "/", "-", -1)
node := strings.Replace(id, "/", "-", -1)
return filepath.Join(prefix, service, node)
}
func servicePath(s string) string {
return filepath.Join(prefix, strings.Replace(s, "/", "-", -1))
}
func (e *etcdRegistry) Deregister(s *registry.Service) error {
if len(s.Nodes) == 0 {
return errors.New("Require at least one node")
}
for _, node := range s.Nodes {
_, err := e.client.Delete(context.Background(), nodePath(s.Name, node.Id), &etcd.DeleteOptions{Recursive: false})
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if err != nil {
return err
}
}
e.client.Delete(context.Background(), servicePath(s.Name), &etcd.DeleteOptions{Dir: true})
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return nil
}
func (e *etcdRegistry) Register(s *registry.Service) error {
if len(s.Nodes) == 0 {
return errors.New("Require at least one node")
}
service := &registry.Service{
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Name: s.Name,
Version: s.Version,
Metadata: s.Metadata,
Endpoints: s.Endpoints,
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}
e.client.Set(context.Background(), servicePath(s.Name), "", &etcd.SetOptions{Dir: true})
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for _, node := range s.Nodes {
service.Nodes = []*registry.Node{node}
_, err := e.client.Set(context.Background(), nodePath(service.Name, node.Id), encode(service), &etcd.SetOptions{})
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if err != nil {
return err
}
}
return nil
}
func (e *etcdRegistry) GetService(name string) (*registry.Service, error) {
e.RLock()
service, ok := e.services[name]
e.RUnlock()
if ok {
return service, nil
}
rsp, err := e.client.Get(context.Background(), servicePath(name), &etcd.GetOptions{})
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if err != nil && !strings.HasPrefix(err.Error(), "100: Key not found") {
return nil, err
}
s := &registry.Service{}
for _, n := range rsp.Node.Nodes {
if n.Dir {
continue
}
sn := decode(n.Value)
s.Name = sn.Name
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s.Version = sn.Version
s.Metadata = sn.Metadata
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s.Endpoints = sn.Endpoints
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for _, node := range sn.Nodes {
s.Nodes = append(s.Nodes, node)
}
}
return s, nil
}
func (e *etcdRegistry) ListServices() ([]*registry.Service, error) {
e.RLock()
serviceMap := e.services
e.RUnlock()
var services []*registry.Service
if len(serviceMap) > 0 {
for _, service := range services {
services = append(services, service)
}
return services, nil
}
rsp, err := e.client.Get(context.Background(), prefix, &etcd.GetOptions{Recursive: true, Sort: true})
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if err != nil && !strings.HasPrefix(err.Error(), "100: Key not found") {
return nil, err
}
for _, node := range rsp.Node.Nodes {
service := &registry.Service{}
for _, n := range node.Nodes {
i := decode(n.Value)
service.Name = i.Name
for _, in := range i.Nodes {
service.Nodes = append(service.Nodes, in)
}
}
services = append(services, service)
}
return services, nil
}
func (e *etcdRegistry) Watch() (registry.Watcher, error) {
// todo: fix watcher
return newEtcdWatcher(e)
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}
func NewRegistry(addrs []string, opt ...registry.Option) registry.Registry {
var cAddrs []string
for _, addr := range addrs {
if len(addr) == 0 {
continue
}
cAddrs = append(cAddrs, addr)
}
if len(cAddrs) == 0 {
cAddrs = []string{"http://127.0.0.1:2379"}
}
c, _ := etcd.New(etcd.Config{
Endpoints: cAddrs,
})
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e := &etcdRegistry{
client: etcd.NewKeysAPI(c),
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services: make(map[string]*registry.Service),
}
return e
}