feat: add opensergo metadata (#1947)

* add opensergo metadata

.golangci.yml

@@ -28,7 +28,6 @@ linters:
     - structcheck
     - typecheck
     - unused
-    - unconvert
     - varcheck
     - whitespace
     - wastedassign

contrib/opensergo/go.mod

@@ -0,0 +1,22 @@
+module github.com/go-kratos/kratos/contrib/opensergo/v2
+
+go 1.17
+
+require (
+	github.com/go-kratos/kratos/v2 v2.2.1
+	github.com/opensergo/opensergo-go v0.0.0-20220331070310-e5b01fee4d1c
+	golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4
+	google.golang.org/grpc v1.44.0
+	google.golang.org/protobuf v1.27.1
+)
+
+require (
+	github.com/go-playground/form/v4 v4.2.0 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/google/uuid v1.3.0 // indirect
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
+	golang.org/x/sys v0.0.0-20210816074244-15123e1e1f71 // indirect
+	golang.org/x/text v0.3.5 // indirect
+	google.golang.org/genproto v0.0.0-20220126215142-9970aeb2e350 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
+)

contrib/opensergo/go.sum

@@ -0,0 +1,175 @@
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contrib/opensergo/opensergo.go

@@ -0,0 +1,138 @@
+package opensergo
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"net"
+	"net/url"
+	"os"
+	"strconv"
+	"time"
+
+	"github.com/go-kratos/kratos/v2"
+	v1 "github.com/opensergo/opensergo-go/proto/service_contract/v1"
+	"golang.org/x/net/context"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/reflect/protoregistry"
+)
+
+type Option func(*options)
+
+func WithEndpoint(endpoint string) Option {
+	return func(o *options) {
+		o.Endpoint = endpoint
+	}
+}
+
+type options struct {
+	Endpoint string `json:"endpoint"`
+}
+
+func (o *options) ParseJSON(data []byte) error {
+	return json.Unmarshal(data, o)
+}
+
+type OpenSergo struct {
+	mdClient v1.MetadataServiceClient
+}
+
+func New(opts ...Option) (*OpenSergo, error) {
+	opt := options{
+		Endpoint: os.Getenv("OPENSERGO_ENDPOINT"),
+	}
+	// https://github.com/opensergo/opensergo-specification/blob/main/specification/en/README.md
+	if v := os.Getenv("OPENSERGO_BOOTSTRAP"); v != "" {
+		if err := opt.ParseJSON([]byte(v)); err != nil {
+			return nil, err
+		}
+	}
+	if v := os.Getenv("OPENSERGO_BOOTSTRAP_CONFIG"); v != "" {
+		b, err := ioutil.ReadFile(v)
+		if err != nil {
+			return nil, err
+		}
+		if err := opt.ParseJSON(b); err != nil {
+			return nil, err
+		}
+	}
+	for _, o := range opts {
+		o(&opt)
+	}
+	dialCtx := context.Background()
+	dialCtx, cancel := context.WithTimeout(dialCtx, time.Second)
+	defer cancel()
+	conn, err := grpc.DialContext(dialCtx, opt.Endpoint, grpc.WithTransportCredentials(insecure.NewCredentials()))
+	if err != nil {
+		return nil, err
+	}
+	return &OpenSergo{
+		mdClient: v1.NewMetadataServiceClient(conn),
+	}, nil
+}
+
+func (s *OpenSergo) ReportMetadata(ctx context.Context, app kratos.AppInfo) error {
+	services, err := s.listServiceDescriptors()
+	if err != nil {
+		return err
+	}
+	serviceMetadata := &v1.ServiceMetadata{
+		ServiceContract: &v1.ServiceContract{
+			Services: services,
+		},
+	}
+	for _, endpoint := range app.Endpoint() {
+		u, err := url.Parse(endpoint) //nolint
+		if err != nil {
+			return err
+		}
+		host, port, err := net.SplitHostPort(u.Host)
+		if err != nil {
+			return err
+		}
+		portValue, err := strconv.Atoi(port)
+		if err != nil {
+			return err
+		}
+		serviceMetadata.Protocols = append(serviceMetadata.Protocols, u.Scheme)
+		serviceMetadata.ListeningAddresses = append(serviceMetadata.ListeningAddresses, &v1.SocketAddress{
+			Address:   host,
+			PortValue: uint32(portValue),
+		})
+	}
+	_, err = s.mdClient.ReportMetadata(ctx, &v1.ReportMetadataRequest{
+		AppName:         app.Name(),
+		ServiceMetadata: []*v1.ServiceMetadata{serviceMetadata},
+	})
+	return err
+}
+
+func (s *OpenSergo) listServiceDescriptors() (services []*v1.ServiceDescriptor, err error) {
+	protoregistry.GlobalFiles.RangeFiles(func(fd protoreflect.FileDescriptor) bool {
+		for i := 0; i < fd.Services().Len(); i++ {
+			var (
+				methods []*v1.MethodDescriptor
+				sd      = fd.Services().Get(i)
+			)
+			for j := 0; j < sd.Methods().Len(); j++ {
+				md := sd.Methods().Get(i)
+				mName := string(md.Name())
+				inputType := string(md.Input().FullName())
+				outputType := string(md.Output().FullName())
+				methodDesc := v1.MethodDescriptor{
+					Name:        mName,
+					InputTypes:  []string{inputType},
+					OutputTypes: []string{outputType},
+				}
+				methods = append(methods, &methodDesc)
+			}
+			services = append(services, &v1.ServiceDescriptor{
+				Name:    string(sd.Name()),
+				Methods: methods,
+			})
+		}
+		return true
+	})
+	return
+}