add observer

sd/plugin/grpc.go

@@ -0,0 +1,134 @@
+package sd
+
+import (
+	"context"
+	"io"
+
+	"github.com/go-gost/core/logger"
+	"github.com/go-gost/core/sd"
+	"github.com/go-gost/plugin/sd/proto"
+	"github.com/go-gost/x/internal/plugin"
+	"google.golang.org/grpc"
+)
+
+type grpcPlugin struct {
+	conn   grpc.ClientConnInterface
+	client proto.SDClient
+	log    logger.Logger
+}
+
+// NewGRPCPlugin creates an SD plugin based on gRPC.
+func NewGRPCPlugin(name string, addr string, opts ...plugin.Option) sd.SD {
+	var options plugin.Options
+	for _, opt := range opts {
+		opt(&options)
+	}
+
+	log := logger.Default().WithFields(map[string]any{
+		"kind": "sd",
+		"sd":   name,
+	})
+	conn, err := plugin.NewGRPCConn(addr, &options)
+	if err != nil {
+		log.Error(err)
+	}
+
+	p := &grpcPlugin{
+		conn: conn,
+		log:  log,
+	}
+	if conn != nil {
+		p.client = proto.NewSDClient(conn)
+	}
+	return p
+}
+
+func (p *grpcPlugin) Register(ctx context.Context, service *sd.Service, opts ...sd.Option) error {
+	if p.client == nil {
+		return nil
+	}
+
+	_, err := p.client.Register(ctx,
+		&proto.RegisterRequest{
+			Service: &proto.Service{
+				Id:      service.ID,
+				Name:    service.Name,
+				Node:    service.Node,
+				Network: service.Network,
+				Address: service.Address,
+			},
+		})
+	if err != nil {
+		p.log.Error(err)
+		return err
+	}
+	return nil
+}
+
+func (p *grpcPlugin) Deregister(ctx context.Context, service *sd.Service) error {
+	if p.client == nil {
+		return nil
+	}
+
+	_, err := p.client.Deregister(ctx, &proto.DeregisterRequest{
+		Service: &proto.Service{
+			Id:      service.ID,
+			Name:    service.Name,
+			Node:    service.Node,
+			Network: service.Network,
+			Address: service.Address,
+		},
+	})
+	return err
+}
+
+func (p *grpcPlugin) Renew(ctx context.Context, service *sd.Service) error {
+	if p.client == nil {
+		return nil
+	}
+
+	_, err := p.client.Renew(ctx, &proto.RenewRequest{
+		Service: &proto.Service{
+			Id:      service.ID,
+			Name:    service.Name,
+			Node:    service.Node,
+			Network: service.Network,
+			Address: service.Address,
+		},
+	})
+	return err
+}
+
+func (p *grpcPlugin) Get(ctx context.Context, name string) ([]*sd.Service, error) {
+	if p.client == nil {
+		return nil, nil
+	}
+
+	r, err := p.client.Get(ctx, &proto.GetServiceRequest{
+		Name: name,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	var services []*sd.Service
+	for _, v := range r.Services {
+		if v == nil {
+			continue
+		}
+		services = append(services, &sd.Service{
+			Node:    v.Node,
+			Name:    v.Name,
+			Network: v.Network,
+			Address: v.Address,
+		})
+	}
+	return services, nil
+}
+
+func (p *grpcPlugin) Close() error {
+	if closer, ok := p.conn.(io.Closer); ok {
+		return closer.Close()
+	}
+	return nil
+}