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zookeeper.go
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zookeeper.go
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// Package zookeeper provides a zookeeper registry
package zookeeper
import (
"errors"
"sync"
"time"
"github.com/micro/go-log"
"github.com/micro/go-micro/cmd"
"github.com/micro/go-micro/registry"
"github.com/samuel/go-zookeeper/zk"
hash "github.com/mitchellh/hashstructure"
)
var (
prefix = "/micro-registry"
)
type zookeeperRegistry struct {
client *zk.Conn
options registry.Options
sync.Mutex
register map[string]uint64
}
func init() {
cmd.DefaultRegistries["zookeeper"] = NewRegistry
}
func configure(z *zookeeperRegistry, opts ...registry.Option) error {
cAddrs := z.options.Addrs
for _, o := range opts {
o(&z.options)
}
if z.options.Timeout == 0 {
z.options.Timeout = 5
}
// already set
if z.client != nil && len(z.options.Addrs) == len(cAddrs) {
return nil
}
// reset
cAddrs = nil
for _, addr := range z.options.Addrs {
if len(addr) == 0 {
continue
}
cAddrs = append(cAddrs, addr)
}
if len(cAddrs) == 0 {
cAddrs = []string{"127.0.0.1:2181"}
}
// connect to zookeeper
c, _, err := zk.Connect(cAddrs, time.Second*z.options.Timeout)
if err != nil {
log.Fatal(err)
}
// create our prefix path
if err := createPath(prefix, []byte{}, c); err != nil {
log.Fatal(err)
}
z.client = c
return nil
}
func (z *zookeeperRegistry) Init(opts ...registry.Option) error {
return configure(z, opts...)
}
func (z *zookeeperRegistry) Options() registry.Options {
return z.options
}
func (z *zookeeperRegistry) Deregister(s *registry.Service) error {
if len(s.Nodes) == 0 {
return errors.New("Require at least one node")
}
// delete our hash of the service
z.Lock()
delete(z.register, s.Name)
z.Unlock()
for _, node := range s.Nodes {
err := z.client.Delete(nodePath(s.Name, node.Id), -1)
if err != nil {
return err
}
}
return nil
}
func (z *zookeeperRegistry) Register(s *registry.Service, opts ...registry.RegisterOption) error {
if len(s.Nodes) == 0 {
return errors.New("Require at least one node")
}
var options registry.RegisterOptions
for _, o := range opts {
o(&options)
}
// create hash of service; uint64
h, err := hash.Hash(s, nil)
if err != nil {
return err
}
// get existing hash
z.Lock()
v, ok := z.register[s.Name]
z.Unlock()
// the service is unchanged, skip registering
if ok && v == h {
return nil
}
service := ®istry.Service{
Name: s.Name,
Version: s.Version,
Metadata: s.Metadata,
Endpoints: s.Endpoints,
}
for _, node := range s.Nodes {
service.Nodes = []*registry.Node{node}
exists, _, err := z.client.Exists(nodePath(service.Name, node.Id))
if err != nil {
return err
}
srv, err := encode(service)
if err != nil {
return err
}
if exists {
_, err := z.client.Set(nodePath(service.Name, node.Id), srv, -1)
if err != nil {
return err
}
} else {
err := createPath(nodePath(service.Name, node.Id), srv, z.client)
if err != nil {
return err
}
}
}
// save our hash of the service
z.Lock()
z.register[s.Name] = h
z.Unlock()
return nil
}
func (z *zookeeperRegistry) GetService(name string) ([]*registry.Service, error) {
l, _, err := z.client.Children(servicePath(name))
if err != nil {
return nil, err
}
serviceMap := make(map[string]*registry.Service)
for _, n := range l {
_, stat, err := z.client.Children(nodePath(name, n))
if err != nil {
return nil, err
}
if stat.NumChildren > 0 {
continue
}
b, _, err := z.client.Get(nodePath(name, n))
if err != nil {
return nil, err
}
sn, err := decode(b)
if err != nil {
return nil, err
}
s, ok := serviceMap[sn.Version]
if !ok {
s = ®istry.Service{
Name: sn.Name,
Version: sn.Version,
Metadata: sn.Metadata,
Endpoints: sn.Endpoints,
}
serviceMap[s.Version] = s
}
for _, node := range sn.Nodes {
s.Nodes = append(s.Nodes, node)
}
}
var services []*registry.Service
for _, service := range serviceMap {
services = append(services, service)
}
return services, nil
}
func (z *zookeeperRegistry) ListServices() ([]*registry.Service, error) {
srv, _, err := z.client.Children(prefix)
if err != nil {
return nil, err
}
serviceMap := make(map[string]*registry.Service)
for _, key := range srv {
s := servicePath(key)
nodes, _, err := z.client.Children(s)
if err != nil {
return nil, err
}
for _, node := range nodes {
_, stat, err := z.client.Children(nodePath(key, node))
if err != nil {
return nil, err
}
if stat.NumChildren == 0 {
b, _, err := z.client.Get(nodePath(key, node))
if err != nil {
return nil, err
}
i, err := decode(b)
if err != nil {
return nil, err
}
serviceMap[s] = ®istry.Service{Name: i.Name}
}
}
}
var services []*registry.Service
for _, service := range serviceMap {
services = append(services, service)
}
return services, nil
}
func (z *zookeeperRegistry) String() string {
return "zookeeper"
}
func (z *zookeeperRegistry) Watch(opts ...registry.WatchOption) (registry.Watcher, error) {
return newZookeeperWatcher(z, opts...)
}
func NewRegistry(opts ...registry.Option) registry.Registry {
var options registry.Options
for _, o := range opts {
o(&options)
}
if options.Timeout == 0 {
options.Timeout = 5
}
var cAddrs []string
for _, addr := range options.Addrs {
if len(addr) == 0 {
continue
}
cAddrs = append(cAddrs, addr)
}
if len(cAddrs) == 0 {
cAddrs = []string{"127.0.0.1:2181"}
}
// connect to zookeeper
c, _, err := zk.Connect(cAddrs, time.Second*options.Timeout)
if err != nil {
log.Fatal(err)
}
// create our prefix path
if err := createPath(prefix, []byte{}, c); err != nil {
log.Fatal(err)
}
return &zookeeperRegistry{
client: c,
options: options,
register: make(map[string]uint64),
}
}