@@ -0,0 +36,4 @@
+// NewGRPCStreamClientInterceptor creates new gRPC stream interceptor to save gRPC client traces.
+func NewGRPCStreamClientInterceptor() grpc.StreamClientInterceptor {
+	return func(ctx context.Context, desc *grpc.StreamDesc, cc *grpc.ClientConn, method string, streamer grpc.Streamer, opts ...grpc.CallOption) (grpc.ClientStream, error) {
+		ctx, span := startClientSpan(ctx, cc, method)

@@ -3,6 +3,7 @@
 ## [Unreleased]
 
 ### Added
+- Base tracing support

@@ -5,3 +5,3 @@
 require (
 	git.frostfs.info/TrueCloudLab/frostfs-crypto v0.6.0
-	github.com/stretchr/testify v1.7.0
+	github.com/stretchr/testify v1.8.2

@@ -0,0 +2,4 @@
+
+import "fmt"
+
+// Exporter is type of tracing target

@@ -0,0 +117,4 @@
+	ctx, span := StartSpanFromContext(ctx, method, trace.WithAttributes(
+		semconv.RPCSystemGRPC,
+		semconv.RPCMethod(method),
+		attribute.String("rpc.grpc.target", cc.Target())),

@@ -0,0 +23,4 @@
+	c.md.Set(key, value)
+}
+
+func (c *grpcMetadataCarrier) Keys() []string {

@@ -0,0 +109,4 @@
+
+func (cs *clientStream) RecvMsg(m interface{}) error {
+	err := cs.originalStream.RecvMsg(m)
+	if (err == nil && !cs.desc.ServerStreams) || err != nil {

@@ -0,0 +10,4 @@
+)
+
+const (
+	traceIDHeader = "x-frostfs-trace-id"

@@ -0,0 +6,4 @@
+type Exporter string
+
+const (
+	// Stdout ...

@@ -0,0 +10,4 @@
+)
+
+const (
+	traceIDHeader = "x-frostfs-trace-id"

@@ -0,0 +14,4 @@
+)
+
+// NewGRPCUnaryClientInteceptor creates new gRPC unary interceptor to save gRPC client traces.
+func NewGRPCUnaryClientInteceptor() grpc.UnaryClientInterceptor {

@@ -0,0 +116,4 @@
+	if err != nil || !cs.desc.ServerStreams {
+		select {
+		case <-cs.done:
+		case cs.finished <- err:

@@ -0,0 +14,4 @@
+	spanIDHeader  = "x-frostfs-span-id"
+	flagsHeader   = "x-frostfs-trace-flags"
+
+	flagsSampled    = 0x01

@@ -0,0 +16,4 @@
+)
+
+var (
+	tracingLock = &sync.Mutex{}

@@ -0,0 +129,4 @@
+	case Stdout:
+		return stdouttrace.New()
+	case OTLPgRPC:
+		return otlptracegrpc.New(ctx, otlptracegrpc.WithEndpoint(cfg.Endpoint), otlptracegrpc.WithInsecure())

@@ -0,0 +29,4 @@
+var Propagator propagation.TextMapPropagator = &propagator{}
+
+// Inject injects tracing info to carrier.
+func (p *propagator) Inject(ctx context.Context, carrier propagation.TextMapCarrier) {