/
registry.go
298 lines (265 loc) · 6.68 KB
/
registry.go
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package etcd3
import (
"context"
"encoding/json"
"errors"
"github.com/mitchellh/hashstructure/v2"
"github.com/tsingsun/woocoo/pkg/conf"
"github.com/tsingsun/woocoo/pkg/log"
"github.com/tsingsun/woocoo/rpc/grpcx/registry"
"go.etcd.io/etcd/api/v3/v3rpc/rpctypes"
clientv3 "go.etcd.io/etcd/client/v3"
"google.golang.org/grpc"
"google.golang.org/grpc/resolver"
"sync"
"time"
)
func init() {
registry.RegisterDriver(scheme, &Driver{cache: make(map[string]registry.Registry)})
}
// Driver is an etcd3 registry driver. Support reference config.
type Driver struct {
cache map[string]registry.Registry
mu sync.RWMutex
}
// CreateRegistry creates a new registry.
func (drv *Driver) CreateRegistry(cnf *conf.Configuration) (registry.Registry, error) {
drv.mu.Lock()
defer drv.mu.Unlock()
ccfg := cnf
ref := cnf.String("ref")
if ref != "" {
if v, ok := drv.cache[ref]; ok {
return v, nil
}
ccfg = cnf.Root().Sub(ref)
}
r := New()
r.Apply(ccfg)
if ref != "" {
drv.cache[ref] = r
}
return r, nil
}
// GetRegistry gets a registry by name.
//
// only a reference registry can be got.see the config example
func (drv *Driver) GetRegistry(name string) (registry.Registry, error) {
r, ok := drv.cache[name]
if !ok {
return nil, errors.New("registry not found,may not set it a reference registry")
}
return r, nil
}
// ResolverBuilder creates a new resolver builder.
func (drv *Driver) ResolverBuilder(cnf *conf.Configuration) (resolver.Builder, error) {
drv.mu.Lock()
defer drv.mu.Unlock()
var opts Options
ccfg := cnf
if ref := cnf.String("ref"); ref != "" {
ccfg = cnf.Root().Sub(ref)
}
if err := ccfg.Unmarshal(&opts); err != nil {
return nil, err
}
return &etcdBuilder{
etcdConfig: opts.EtcdConfig,
}, nil
}
// WithDialOptions no need to implement
func (drv *Driver) WithDialOptions(registry.DialOptions) ([]grpc.DialOption, error) {
return nil, nil
}
type Options struct {
EtcdConfig clientv3.Config `json:"etcd" yaml:"etcd"`
TTL time.Duration `json:"ttl" yaml:"ttl"`
}
// Registry is an etcd3 registry for service discovery.
type Registry struct {
sync.RWMutex
opts Options
client *clientv3.Client
register map[string]uint64
leases map[string]clientv3.LeaseID
}
func New() *Registry {
return &Registry{
register: make(map[string]uint64),
leases: make(map[string]clientv3.LeaseID),
opts: Options{},
}
}
func (r *Registry) Apply(cfg *conf.Configuration) {
if err := cfg.Unmarshal(&r.opts); err != nil {
panic(err)
}
if k := "etcd.tls"; cfg.IsSet(k) {
tls, err := conf.NewTLS(cfg.Sub(k)).BuildTlsConfig()
if err != nil {
panic(err)
}
r.opts.EtcdConfig.TLS = tls
}
err := r.buildClient()
if err != nil {
panic(err)
}
}
func BuildFromConfig(config *Options) (*Registry, error) {
r := &Registry{
register: make(map[string]uint64),
leases: make(map[string]clientv3.LeaseID),
}
if config == nil {
r.opts = Options{
EtcdConfig: clientv3.Config{
Endpoints: []string{"127.0.0.1:2379"},
DialTimeout: 5 * time.Second,
},
}
} else {
r.opts = *config
}
if err := r.buildClient(); err != nil {
return nil, err
}
return r, nil
}
func (r *Registry) buildClient() (err error) {
r.opts.EtcdConfig.Logger = log.Global().Logger().Operator()
r.client, err = clientv3.New(r.opts.EtcdConfig)
return err
}
func (r *Registry) Register(node *registry.ServiceInfo) error {
key := node.BuildKey()
r.RLock()
leaseID, ok := r.leases[key]
r.RUnlock()
if !ok {
ctx, cancle := context.WithTimeout(context.Background(), r.opts.EtcdConfig.DialTimeout)
defer cancle()
// look for the existing key
rsp, err := r.client.Get(ctx, key, clientv3.WithSerializable())
if err != nil {
return err
}
// get the existing lease
for _, kv := range rsp.Kvs {
if kv.Lease > 0 {
leaseID = clientv3.LeaseID(kv.Lease)
// decode the existing node,if the value unmarshal error,will ignore
var oldNode *registry.ServiceInfo
_ = json.Unmarshal(kv.Value, &oldNode)
if oldNode == nil {
continue
}
// create hash of service; uint64
h, err := hashstructure.Hash(oldNode, hashstructure.FormatV2, nil)
if err != nil {
continue
}
// save the info
r.Lock()
r.leases[node.BuildKey()] = leaseID
r.register[node.BuildKey()] = h
r.Unlock()
break
}
}
}
var leaseNotFound bool
if leaseID > 0 {
if _, err := r.client.KeepAliveOnce(context.TODO(), leaseID); err != nil {
if err != rpctypes.ErrLeaseNotFound {
return err
}
// lease not found do register
leaseNotFound = true
}
}
h, err := hashstructure.Hash(node, hashstructure.FormatV2, nil)
if err != nil {
return err
}
// get existing hash for the service node
r.Lock()
oldh, ok := r.register[node.BuildKey()]
r.Unlock()
// the service is unchanged, skip registering
if ok && oldh == h && !leaseNotFound {
return nil
}
ctx, cancel := context.WithTimeout(context.Background(), r.opts.EtcdConfig.DialTimeout)
defer cancel()
var lgr *clientv3.LeaseGrantResponse
if r.opts.TTL.Seconds() > 0 {
// get a lease used to expire keys since we have a ttl
lgr, err = r.client.Grant(ctx, int64(r.opts.TTL.Seconds()))
if err != nil {
return err
}
}
// create an entry for the node
val, err := json.Marshal(node)
if err != nil {
return err
}
value := string(val)
if lgr != nil {
_, err = r.client.Put(ctx, key, value, clientv3.WithLease(lgr.ID))
} else {
_, err = r.client.Put(ctx, key, value)
}
if err != nil {
return err
}
r.Lock()
// save our hash of the service
r.register[node.BuildKey()] = h
// save our leaseID of the service
if lgr != nil {
r.leases[node.BuildKey()] = lgr.ID
}
r.Unlock()
return nil
}
// Unregister remove service from etcd
func (r *Registry) Unregister(node *registry.ServiceInfo) error {
r.Lock()
// delete our hash of the service
delete(r.register, node.BuildKey())
// delete our lease of the service
delete(r.leases, node.BuildKey())
r.Unlock()
ctx, cancel := context.WithTimeout(context.Background(), r.opts.EtcdConfig.DialTimeout)
defer cancel()
_, err := r.client.Delete(ctx, node.BuildKey())
if err != nil {
return err
}
return nil
}
func (r *Registry) Close() {
r.client.Close()
}
// GetServiceInfos implements registry interface
func (r *Registry) GetServiceInfos(service string) ([]*registry.ServiceInfo, error) {
if r.client == nil {
return nil, errors.New("etcd client is nil")
}
ctx, cancel := context.WithTimeout(context.Background(), r.opts.EtcdConfig.DialTimeout)
defer cancel()
resp, err := r.client.Get(ctx, service, clientv3.WithPrefix())
if err != nil {
return nil, err
}
nodeInfos, err := extractAddrs(resp)
if err != nil {
return nil, err
}
return nodeInfos, nil
}
func (r *Registry) TTL() time.Duration {
return r.opts.TTL
}