feat(grpc): support gNMI basic auth and subscription modes #125
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -2,25 +2,72 @@ package main | |
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| import ( | ||
| "context" | ||
| "encoding/base64" | ||
| "encoding/json" | ||
| "fmt" | ||
| "log" | ||
| "net" | ||
| "strings" | ||
| "time" | ||
|
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||
| gnmi "github.com/openconfig/gnmi/proto/gnmi" | ||
| auth "github.com/universal-tool-calling-protocol/go-utcp/src/auth" | ||
| "github.com/universal-tool-calling-protocol/go-utcp/src/grpcpb" | ||
| . "github.com/universal-tool-calling-protocol/go-utcp/src/providers/base" | ||
| providers "github.com/universal-tool-calling-protocol/go-utcp/src/providers/grpc" | ||
| transports "github.com/universal-tool-calling-protocol/go-utcp/src/transports/grpc" | ||
| "google.golang.org/grpc" | ||
| "google.golang.org/grpc/metadata" | ||
| ) | ||
|
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| type UnifiedServer struct { | ||
| gnmi.UnimplementedGNMIServer | ||
| grpcpb.UnimplementedUTCPServiceServer | ||
| } | ||
|
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| const ( | ||
| user = "alice" | ||
| pass = "secret" | ||
| ) | ||
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| func authFromContext(ctx context.Context) error { | ||
| md, ok := metadata.FromIncomingContext(ctx) | ||
| if !ok { | ||
| return fmt.Errorf("missing metadata") | ||
| } | ||
| vals := md.Get("authorization") | ||
| if len(vals) == 0 { | ||
| return fmt.Errorf("unauthorized") | ||
| } | ||
| parts := strings.SplitN(vals[0], " ", 2) | ||
| if len(parts) != 2 || !strings.EqualFold(parts[0], "Basic") { | ||
| return fmt.Errorf("unauthorized") | ||
| } | ||
| decoded, err := base64.StdEncoding.DecodeString(parts[1]) | ||
| if err != nil { | ||
| return fmt.Errorf("unauthorized") | ||
| } | ||
| up := strings.SplitN(string(decoded), ":", 2) | ||
| if len(up) != 2 || up[0] != user || up[1] != pass { | ||
| return fmt.Errorf("unauthorized") | ||
| } | ||
| return nil | ||
| } | ||
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| func unaryAuthInterceptor(ctx context.Context, req interface{}, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (interface{}, error) { | ||
| if err := authFromContext(ctx); err != nil { | ||
| return nil, err | ||
| } | ||
| return handler(ctx, req) | ||
| } | ||
|
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| func streamAuthInterceptor(srv interface{}, ss grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error { | ||
| if err := authFromContext(ss.Context()); err != nil { | ||
| return err | ||
| } | ||
| return handler(srv, ss) | ||
| } | ||
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| func (s *UnifiedServer) CallTool(ctx context.Context, req *grpcpb.ToolCallRequest) (*grpcpb.ToolCallResponse, error) { | ||
| // Simple implementation - could be expanded based on tool name | ||
| return &grpcpb.ToolCallResponse{ | ||
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@@ -52,10 +99,12 @@ func (s *UnifiedServer) CallToolStream(req *grpcpb.ToolCallRequest, stream grpcp | |
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| // Create a mock update response | ||
| update := map[string]interface{}{ | ||
| "timestamp": time.Now().UnixNano(), | ||
| "path": args["path"], | ||
| "value": fmt.Sprintf("mock_value_%d", counter), | ||
| "mode": args["mode"], | ||
| "sub_mode": args["sub_mode"], | ||
| "sample_interval_ns": args["sample_interval_ns"], | ||
| } | ||
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| updateJson, err := json.Marshal(update) | ||
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@@ -97,14 +146,19 @@ func (s *UnifiedServer) GetManual(ctx context.Context, e *grpcpb.Empty) (*grpcpb | |
| } | ||
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| func (s *UnifiedServer) Subscribe(stream gnmi.GNMI_SubscribeServer) error { | ||
| ctx := stream.Context() | ||
|
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| if _, err := stream.Recv(); err != nil { | ||
| return err | ||
| } | ||
| resp := &gnmi.SubscribeResponse{ | ||
| Response: &gnmi.SubscribeResponse_Update{ | ||
| Update: &gnmi.Notification{Update: []*gnmi.Update{{ | ||
| Path: &gnmi.Path{Elem: []*gnmi.PathElem{ | ||
| {Name: "interfaces"}, | ||
| {Name: "interface", Key: map[string]string{"name": "eth0"}}, | ||
| }}, | ||
| Val: &gnmi.TypedValue{Value: &gnmi.TypedValue_StringVal{StringVal: "UP"}}, | ||
| }}}, | ||
| }, | ||
| } | ||
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@@ -116,7 +170,10 @@ func startGNMIServer(addr string) *grpc.Server { | |
| if err != nil { | ||
| log.Fatalf("listen: %v", err) | ||
| } | ||
| srv := grpc.NewServer( | ||
| grpc.UnaryInterceptor(unaryAuthInterceptor), | ||
| grpc.StreamInterceptor(streamAuthInterceptor), | ||
| ) | ||
| gnmi.RegisterGNMIServer(srv, &UnifiedServer{}) | ||
| grpcpb.RegisterUTCPServiceServer(srv, &UnifiedServer{}) | ||
| go srv.Serve(lis) | ||
|
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@@ -130,14 +187,15 @@ func main() { | |
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| logger := func(format string, args ...interface{}) { log.Printf(format, args...) } | ||
| tr := transports.NewGRPCClientTransport(logger) | ||
| var a auth.Auth = auth.NewBasicAuth(user, pass) | ||
| prov := &providers.GRPCProvider{BaseProvider: BaseProvider{Name: "g", ProviderType: ProviderGRPC}, Host: "127.0.0.1", Port: 9339, ServiceName: "gnmi.gNMI", MethodName: "Subscribe", Auth: &a} | ||
|
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| ctx := context.Background() | ||
| if _, err := tr.RegisterToolProvider(ctx, prov); err != nil { | ||
| log.Fatalf("register: %v", err) | ||
| } | ||
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| stream, err := tr.CallToolStream(ctx, "gnmi_subscribe", map[string]any{"path": "/interfaces/interface[name=eth0]", "mode": "STREAM", "sub_mode": "SAMPLE", "sample_interval_ns": 500000000}, prov) | ||
| if err != nil { | ||
| log.Fatalf("call stream: %v", err) | ||
| } | ||
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Returning a generic fmt.Errorf here causes gRPC to translate the error to status code "Unknown", so the client cannot properly detect an authentication failure. Use status.Error(codes.Unauthenticated, …) instead to return the correct gRPC status code.
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