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package nacos
import (
"context"
"fmt"
"net"
"net/url"
"strconv"
"github.com/nacos-group/nacos-sdk-go/clients/naming_client"
"github.com/nacos-group/nacos-sdk-go/common/constant"
"github.com/nacos-group/nacos-sdk-go/vo"
"github.com/go-kratos/kratos/v2/registry"
)
var (
_ registry.Registrar = (*Registry)(nil)
_ registry.Discovery = (*Registry)(nil)
)
type options struct {
prefix string
weight float64
cluster string
group string
kind string
}
// Option is nacos option.
type Option func(o *options)
// WithPrefix with prefix path.
func WithPrefix(prefix string) Option {
return func(o *options) { o.prefix = prefix }
}
// WithWeight with weight option.
func WithWeight(weight float64) Option {
return func(o *options) { o.weight = weight }
}
// WithCluster with cluster option.
func WithCluster(cluster string) Option {
return func(o *options) { o.cluster = cluster }
}
// WithGroup with group option.
func WithGroup(group string) Option {
return func(o *options) { o.group = group }
}
// WithDefaultKind with default kind option.
func WithDefaultKind(kind string) Option {
return func(o *options) { o.kind = kind }
}
// Registry is nacos registry.
type Registry struct {
opts options
cli naming_client.INamingClient
}
// New new a nacos registry.
func New(cli naming_client.INamingClient, opts ...Option) (r *Registry) {
op := options{
prefix: "/microservices",
cluster: "DEFAULT",
group: constant.DEFAULT_GROUP,
weight: 100,
kind: "grpc",
}
for _, option := range opts {
option(&op)
}
return &Registry{
opts: op,
cli: cli,
}
}
// Register the registration.
func (r *Registry) Register(_ context.Context, si *registry.ServiceInstance) error {
if si.Name == "" {
return fmt.Errorf("kratos/nacos: serviceInstance.name can not be empty")
}
for _, endpoint := range si.Endpoints {
u, err := url.Parse(endpoint)
if err != nil {
return err
}
host, port, err := net.SplitHostPort(u.Host)
if err != nil {
return err
}
p, err := strconv.Atoi(port)
if err != nil {
return err
}
var rmd map[string]string
if si.Metadata == nil {
rmd = map[string]string{
"kind": u.Scheme,
"version": si.Version,
}
} else {
rmd = make(map[string]string, len(si.Metadata)+2)
for k, v := range si.Metadata {
rmd[k] = v
}
rmd["kind"] = u.Scheme
rmd["version"] = si.Version
}
_, e := r.cli.RegisterInstance(vo.RegisterInstanceParam{
Ip: host,
Port: uint64(p),
ServiceName: si.Name + "." + u.Scheme,
Weight: r.opts.weight,
Enable: true,
Healthy: true,
Ephemeral: true,
Metadata: rmd,
ClusterName: r.opts.cluster,
GroupName: r.opts.group,
})
if e != nil {
return fmt.Errorf("RegisterInstance err %v,%v", e, endpoint)
}
}
return nil
}
// Deregister the registration.
func (r *Registry) Deregister(_ context.Context, service *registry.ServiceInstance) error {
for _, endpoint := range service.Endpoints {
u, err := url.Parse(endpoint)
if err != nil {
return err
}
host, port, err := net.SplitHostPort(u.Host)
if err != nil {
return err
}
p, err := strconv.Atoi(port)
if err != nil {
return err
}
if _, err = r.cli.DeregisterInstance(vo.DeregisterInstanceParam{
Ip: host,
Port: uint64(p),
ServiceName: service.Name + "." + u.Scheme,
GroupName: r.opts.group,
Cluster: r.opts.cluster,
Ephemeral: true,
}); err != nil {
return err
}
}
return nil
}
// Watch creates a watcher according to the service name.
func (r *Registry) Watch(ctx context.Context, serviceName string) (registry.Watcher, error) {
return newWatcher(ctx, r.cli, serviceName, r.opts.group, r.opts.kind, []string{r.opts.cluster})
}
// GetService return the service instances in memory according to the service name.
func (r *Registry) GetService(_ context.Context, serviceName string) ([]*registry.ServiceInstance, error) {
res, err := r.cli.SelectInstances(vo.SelectInstancesParam{
ServiceName: serviceName,
GroupName: r.opts.group,
HealthyOnly: true,
})
if err != nil {
return nil, err
}
items := make([]*registry.ServiceInstance, 0, len(res))
for _, in := range res {
kind := r.opts.kind
if k, ok := in.Metadata["kind"]; ok {
kind = k
}
items = append(items, &registry.ServiceInstance{
ID: in.InstanceId,
Name: in.ServiceName,
Version: in.Metadata["version"],
Metadata: in.Metadata,
Endpoints: []string{fmt.Sprintf("%s://%s:%d", kind, in.Ip, in.Port)},
})
}
return items, nil
}