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Merge pull request #810 from milosgajdos83/etcd

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First commit to add etcd registry support
This commit is contained in:
Asim Aslam 2019-10-02 20:27:38 +01:00 committed by GitHub
commit 1129803bcb
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GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 442 additions and 1 deletions
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4
config/cmd/cmd.go
View File

@ -27,6 +27,7 @@ import (
// registries
"github.com/micro/go-micro/registry"
"github.com/micro/go-micro/registry/consul"
"github.com/micro/go-micro/registry/etcd"
"github.com/micro/go-micro/registry/gossip"
"github.com/micro/go-micro/registry/mdns"
rmem "github.com/micro/go-micro/registry/memory"
@ -154,7 +155,7 @@ var (
cli.StringFlag{
Name: "registry",
EnvVar: "MICRO_REGISTRY",
Usage: "Registry for discovery. consul, mdns",
Usage: "Registry for discovery. consul, etcd, mdns",
},
cli.StringFlag{
Name: "registry_address",
@ -194,6 +195,7 @@ var (
"go.micro.registry": regSrv.NewRegistry,
"service": regSrv.NewRegistry,
"consul": consul.NewRegistry,
"etcd": etcd.NewRegistry,
"gossip": gossip.NewRegistry,
"mdns": mdns.NewRegistry,
"memory": rmem.NewRegistry,

6
go.mod
View File

@ -7,6 +7,9 @@ require (
github.com/beevik/ntp v0.2.0
github.com/bitly/go-simplejson v0.5.0
github.com/bwmarrin/discordgo v0.19.0
github.com/coreos/etcd v3.3.15+incompatible
github.com/coreos/go-systemd v0.0.0-20190719114852-fd7a80b32e1f // indirect
github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f // indirect
github.com/forestgiant/sliceutil v0.0.0-20160425183142-94783f95db6c
github.com/fsnotify/fsnotify v1.4.7
github.com/fsouza/go-dockerclient v1.4.4
@ -33,6 +36,9 @@ require (
github.com/nlopes/slack v0.6.0
github.com/pkg/errors v0.8.1
github.com/technoweenie/multipartstreamer v1.0.1 // indirect
go.uber.org/atomic v1.4.0 // indirect
go.uber.org/multierr v1.2.0 // indirect
go.uber.org/zap v1.10.0 // indirect
golang.org/x/crypto v0.0.0-20191001170739-f9e2070545dc
golang.org/x/net v0.0.0-20190930134127-c5a3c61f89f3
google.golang.org/grpc v1.24.0

12
go.sum
View File

@ -26,6 +26,12 @@ github.com/cheekybits/genny v1.0.0/go.mod h1:+tQajlRqAUrPI7DOSpB0XAqZYtQakVtB7wX
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
github.com/containerd/continuity v0.0.0-20181203112020-004b46473808 h1:4BX8f882bXEDKfWIf0wa8HRvpnBoPszJJXL+TVbBw4M=
github.com/containerd/continuity v0.0.0-20181203112020-004b46473808/go.mod h1:GL3xCUCBDV3CZiTSEKksMWbLE66hEyuu9qyDOOqM47Y=
github.com/coreos/etcd v3.3.15+incompatible h1:+9RjdC18gMxNQVvSiXvObLu29mOFmkgdsB4cRTlV+EE=
github.com/coreos/etcd v3.3.15+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
github.com/coreos/go-systemd v0.0.0-20190719114852-fd7a80b32e1f h1:JOrtw2xFKzlg+cbHpyrpLDmnN1HqhBfnX7WDiW7eG2c=
github.com/coreos/go-systemd v0.0.0-20190719114852-fd7a80b32e1f/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f h1:lBNOc5arjvs8E5mO2tbpBpLoyyu8B6e44T7hJy6potg=
github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@ -209,6 +215,12 @@ github.com/technoweenie/multipartstreamer v1.0.1 h1:XRztA5MXiR1TIRHxH2uNxXxaIkKQ
github.com/technoweenie/multipartstreamer v1.0.1/go.mod h1:jNVxdtShOxzAsukZwTSw6MDx5eUJoiEBsSvzDU9uzog=
github.com/xanzy/ssh-agent v0.2.1 h1:TCbipTQL2JiiCprBWx9frJ2eJlCYT00NmctrHxVAr70=
github.com/xanzy/ssh-agent v0.2.1/go.mod h1:mLlQY/MoOhWBj+gOGMQkOeiEvkx+8pJSI+0Bx9h2kr4=
go.uber.org/atomic v1.4.0 h1:cxzIVoETapQEqDhQu3QfnvXAV4AlzcvUCxkVUFw3+EU=
go.uber.org/atomic v1.4.0/go.mod h1:gD2HeocX3+yG+ygLZcrzQJaqmWj9AIm7n08wl/qW/PE=
go.uber.org/multierr v1.2.0 h1:6I+W7f5VwC5SV9dNrZ3qXrDB9mD0dyGOi/ZJmYw03T4=
go.uber.org/multierr v1.2.0/go.mod h1:wR5kodmAFQ0UK8QlbwjlSNy0Z68gJhDJUG5sjR94q/0=
go.uber.org/zap v1.10.0 h1:ORx85nbTijNz8ljznvCMR1ZBIPKFn3jQrag10X2AsuM=
go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
golang.org/x/crypto v0.0.0-20181030102418-4d3f4d9ffa16/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
golang.org/x/crypto v0.0.0-20181203042331-505ab145d0a9/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=

309
registry/etcd/etcd.go Normal file
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@ -0,0 +1,309 @@
// Package etcd provides an etcd service registry
package etcd
import (
"context"
"crypto/tls"
"encoding/json"
"errors"
"path"
"strings"
"sync"
"time"
"github.com/coreos/etcd/clientv3"
"github.com/micro/go-micro/registry"
"github.com/coreos/etcd/etcdserver/api/v3rpc/rpctypes"
hash "github.com/mitchellh/hashstructure"
)
var (
prefix = "/micro-registry"
)
type etcdRegistry struct {
client *clientv3.Client
options registry.Options
sync.Mutex
register map[string]uint64
leases map[string]clientv3.LeaseID
}
func NewRegistry(opts ...registry.Option) registry.Registry {
e := &etcdRegistry{
options: registry.Options{},
register: make(map[string]uint64),
leases: make(map[string]clientv3.LeaseID),
}
configure(e, opts...)
return e
}
func configure(e *etcdRegistry, opts ...registry.Option) error {
config := clientv3.Config{
Endpoints: []string{"127.0.0.1:2379"},
}
for _, o := range opts {
o(&e.options)
}
if e.options.Timeout == 0 {
e.options.Timeout = 5 * time.Second
}
if e.options.Secure || e.options.TLSConfig != nil {
tlsConfig := e.options.TLSConfig
if tlsConfig == nil {
tlsConfig = &tls.Config{
InsecureSkipVerify: true,
}
}
config.TLS = tlsConfig
}
if e.options.Context != nil {
u, ok := e.options.Context.Value(authKey{}).(*authCreds)
if ok {
config.Username = u.Username
config.Password = u.Password
}
}
var cAddrs []string
for _, addr := range e.options.Addrs {
if len(addr) == 0 {
continue
}
cAddrs = append(cAddrs, addr)
}
// if we got addrs then we'll update
if len(cAddrs) > 0 {
config.Endpoints = cAddrs
}
cli, err := clientv3.New(config)
if err != nil {
return err
}
e.client = cli
return nil
}
func encode(s *registry.Service) string {
b, _ := json.Marshal(s)
return string(b)
}
func decode(ds []byte) *registry.Service {
var s *registry.Service
json.Unmarshal(ds, &s)
return s
}
func nodePath(s, id string) string {
service := strings.Replace(s, "/", "-", -1)
node := strings.Replace(id, "/", "-", -1)
return path.Join(prefix, service, node)
}
func servicePath(s string) string {
return path.Join(prefix, strings.Replace(s, "/", "-", -1))
}
func (e *etcdRegistry) Init(opts ...registry.Option) error {
return configure(e, opts...)
}
func (e *etcdRegistry) Options() registry.Options {
return e.options
}
func (e *etcdRegistry) Deregister(s *registry.Service) error {
if len(s.Nodes) == 0 {
return errors.New("Require at least one node")
}
e.Lock()
// delete our hash of the service
delete(e.register, s.Name)
// delete our lease of the service
delete(e.leases, s.Name)
e.Unlock()
ctx, cancel := context.WithTimeout(context.Background(), e.options.Timeout)
defer cancel()
for _, node := range s.Nodes {
_, err := e.client.Delete(ctx, nodePath(s.Name, node.Id))
if err != nil {
return err
}
}
return nil
}
func (e *etcdRegistry) Register(s *registry.Service, opts ...registry.RegisterOption) error {
if len(s.Nodes) == 0 {
return errors.New("Require at least one node")
}
var leaseNotFound bool
//refreshing lease if existing
leaseID, ok := e.leases[s.Name]
if ok {
if _, err := e.client.KeepAliveOnce(context.TODO(), leaseID); err != nil {
if err != rpctypes.ErrLeaseNotFound {
return err
}
// lease not found do register
leaseNotFound = true
}
}
// create hash of service; uint64
h, err := hash.Hash(s, nil)
if err != nil {
return err
}
// get existing hash
e.Lock()
v, ok := e.register[s.Name]
e.Unlock()
// the service is unchanged, skip registering
if ok && v == h && !leaseNotFound {
return nil
}
service := &registry.Service{
Name: s.Name,
Version: s.Version,
Metadata: s.Metadata,
Endpoints: s.Endpoints,
}
var options registry.RegisterOptions
for _, o := range opts {
o(&options)
}
ctx, cancel := context.WithTimeout(context.Background(), e.options.Timeout)
defer cancel()
var lgr *clientv3.LeaseGrantResponse
if options.TTL.Seconds() > 0 {
lgr, err = e.client.Grant(ctx, int64(options.TTL.Seconds()))
if err != nil {
return err
}
}
for _, node := range s.Nodes {
service.Nodes = []*registry.Node{node}
if lgr != nil {
_, err = e.client.Put(ctx, nodePath(service.Name, node.Id), encode(service), clientv3.WithLease(lgr.ID))
} else {
_, err = e.client.Put(ctx, nodePath(service.Name, node.Id), encode(service))
}
if err != nil {
return err
}
}
e.Lock()
// save our hash of the service
e.register[s.Name] = h
// save our leaseID of the service
if lgr != nil {
e.leases[s.Name] = lgr.ID
}
e.Unlock()
return nil
}
func (e *etcdRegistry) GetService(name string) ([]*registry.Service, error) {
ctx, cancel := context.WithTimeout(context.Background(), e.options.Timeout)
defer cancel()
rsp, err := e.client.Get(ctx, servicePath(name)+"/", clientv3.WithPrefix(), clientv3.WithSort(clientv3.SortByKey, clientv3.SortDescend))
if err != nil {
return nil, err
}
if len(rsp.Kvs) == 0 {
return nil, registry.ErrNotFound
}
serviceMap := map[string]*registry.Service{}
for _, n := range rsp.Kvs {
if sn := decode(n.Value); sn != nil {
s, ok := serviceMap[sn.Version]
if !ok {
s = &registry.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 (e *etcdRegistry) ListServices() ([]*registry.Service, error) {
var services []*registry.Service
nameSet := make(map[string]struct{})
ctx, cancel := context.WithTimeout(context.Background(), e.options.Timeout)
defer cancel()
rsp, err := e.client.Get(ctx, prefix, clientv3.WithPrefix(), clientv3.WithSort(clientv3.SortByKey, clientv3.SortDescend))
if err != nil {
return nil, err
}
if len(rsp.Kvs) == 0 {
return []*registry.Service{}, nil
}
for _, n := range rsp.Kvs {
if sn := decode(n.Value); sn != nil {
nameSet[sn.Name] = struct{}{}
}
}
for k := range nameSet {
service := &registry.Service{}
service.Name = k
services = append(services, service)
}
return services, nil
}
func (e *etcdRegistry) Watch(opts ...registry.WatchOption) (registry.Watcher, error) {
return newEtcdWatcher(e, e.options.Timeout, opts...)
}
func (e *etcdRegistry) String() string {
return "etcd"
}

24
registry/etcd/options.go Normal file
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@ -0,0 +1,24 @@
package etcd
import (
"context"
"github.com/micro/go-micro/registry"
)
type authKey struct{}
type authCreds struct {
Username string
Password string
}
// Auth allows you to specify username/password
func Auth(username, password string) registry.Option {
return func(o *registry.Options) {
if o.Context == nil {
o.Context = context.Background()
}
o.Context = context.WithValue(o.Context, authKey{}, &authCreds{Username: username, Password: password})
}
}

88
registry/etcd/watcher.go Normal file
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@ -0,0 +1,88 @@
package etcd
import (
"context"
"errors"
"time"
"github.com/coreos/etcd/clientv3"
"github.com/micro/go-micro/registry"
)
type etcdWatcher struct {
stop chan bool
w clientv3.WatchChan
client *clientv3.Client
timeout time.Duration
}
func newEtcdWatcher(r *etcdRegistry, timeout time.Duration, opts ...registry.WatchOption) (registry.Watcher, error) {
var wo registry.WatchOptions
for _, o := range opts {
o(&wo)
}
ctx, cancel := context.WithCancel(context.Background())
stop := make(chan bool, 1)
go func() {
<-stop
cancel()
}()
watchPath := prefix
if len(wo.Service) > 0 {
watchPath = servicePath(wo.Service) + "/"
}
return &etcdWatcher{
stop: stop,
w: r.client.Watch(ctx, watchPath, clientv3.WithPrefix(), clientv3.WithPrevKV()),
client: r.client,
timeout: timeout,
}, nil
}
func (ew *etcdWatcher) Next() (*registry.Result, error) {
for wresp := range ew.w {
if wresp.Err() != nil {
return nil, wresp.Err()
}
for _, ev := range wresp.Events {
service := decode(ev.Kv.Value)
var action string
switch ev.Type {
case clientv3.EventTypePut:
if ev.IsCreate() {
action = "create"
} else if ev.IsModify() {
action = "update"
}
case clientv3.EventTypeDelete:
action = "delete"
// get service from prevKv
service = decode(ev.PrevKv.Value)
}
if service == nil {
continue
}
return &registry.Result{
Action: action,
Service: service,
}, nil
}
}
return nil, errors.New("could not get next")
}
func (ew *etcdWatcher) Stop() {
select {
case <-ew.stop:
return
default:
close(ew.stop)
}
}