[#15] tracing: Add events for grpc stream calls

Signed-off-by: Roman Loginov <r.loginov@yadro.com>

LICENSE

@@ -0,0 +1,201 @@
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README.md

@@ -0,0 +1,22 @@
+# Helper Go libraries for working with metrics, traces and logging
+
+See package documentation
+at [pkg.go.dev](https://pkg.go.dev/git.frostfs.info/TrueCloudLab/frostfs-observability)
+
+## License and copyright
+
+Copyright 2023-2024 FrostFS contributors
+
+```
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+```

testdata/tracing/invalid_root_ca.pem

@@ -0,0 +1 @@
+invalid content

testdata/tracing/valid_google_globalsign_r4_rsa_root_ca.pem

@@ -0,0 +1,12 @@
+-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

testdata/tracing/valid_google_gts_r4_ecdsa_root_ca.pem

@@ -0,0 +1,13 @@
+-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

tracing/config.go

@@ -1,6 +1,10 @@
 package tracing
 
-import "fmt"
+import (
+	"crypto/x509"
+	"fmt"
+	"maps"
+)
 
 // Exporter is type of tracing target.
 type Exporter string
@@ -18,6 +22,8 @@ type Config struct {
 	Exporter Exporter
 	// Endpoint is collector endpoint for OTLP exporters.
 	Endpoint string
+	// ServerCaCertPool is cert pool of the remote server CA certificate. Use for TLS setup.
+	ServerCaCertPool *x509.CertPool
 
 	// Service is service name that will be used in tracing.
 	// Mandatory.
@@ -28,6 +34,9 @@ type Config struct {
 	// Version is version of service instance.
 	// Optional.
 	Version string
+	// Attributes is KV list of attributes.
+	// Optional.
+	Attributes map[string]string
 }
 
 func (c *Config) validate() error {
@@ -64,6 +73,10 @@ func (c *Config) hasChange(other *Config) bool {
 		return !c.serviceInfoEqual(other)
 	}
 
+	if other.Exporter == OTLPgRPCExporter && !c.ServerCaCertPool.Equal(other.ServerCaCertPool) {
+		return true
+	}
+
 	return c.Exporter != other.Exporter ||
 		c.Endpoint != other.Endpoint ||
 		!c.serviceInfoEqual(other)
@@ -72,5 +85,6 @@ func (c *Config) hasChange(other *Config) bool {
 func (c *Config) serviceInfoEqual(other *Config) bool {
 	return c.Service == other.Service &&
 		c.InstanceID == other.InstanceID &&
-		c.Version == other.Version
+		c.Version == other.Version &&
+		maps.Equal(c.Attributes, other.Attributes)
 }

tracing/config_test.go

@@ -1,7 +1,11 @@
 package tracing
 
 import (
+	"crypto/x509"
+	"os"
 	"testing"
+
+	"github.com/stretchr/testify/require"
 )
 
 func TestConfig_validate(t *testing.T) {
@@ -232,6 +236,28 @@ func TestConfig_hasChange(t *testing.T) {
 				Version:    "v1.0.0",
 			},
 		},
+		{
+			name: "use tls root ca certificate for grpc",
+			want: true,
+			config: Config{
+				Enabled:          true,
+				Exporter:         OTLPgRPCExporter,
+				Endpoint:         "localhost:4717",
+				Service:          "test",
+				InstanceID:       "s01",
+				Version:          "v1.0.0",
+				ServerCaCertPool: readCertPoolByPath(t, "../testdata/tracing/valid_google_globalsign_r4_rsa_root_ca.pem"),
+			},
+			other: Config{
+				Enabled:          true,
+				Exporter:         OTLPgRPCExporter,
+				Endpoint:         "localhost:4717",
+				Service:          "test",
+				InstanceID:       "s01",
+				Version:          "v1.0.0",
+				ServerCaCertPool: readCertPoolByPath(t, "../testdata/tracing/valid_google_gts_r4_ecdsa_root_ca.pem"),
+			},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -241,3 +267,12 @@ func TestConfig_hasChange(t *testing.T) {
 		})
 	}
 }
+
+func readCertPoolByPath(t *testing.T, path string) *x509.CertPool {
+	ca, err := os.ReadFile(path)
+	require.NoError(t, err)
+	roots := x509.NewCertPool()
+	ok := roots.AppendCertsFromPEM(ca)
+	require.True(t, ok)
+	return roots
+}

tracing/grpc/client.go

@@ -2,7 +2,10 @@ package grpc
 
 import (
 	"context"
+	"fmt"
 
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/trace"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/metadata"
 )
@@ -10,14 +13,16 @@ import (
 type clientStream struct {
 	originalStream grpc.ClientStream
 	desc           *grpc.StreamDesc
+	span           trace.Span
 	finished       chan<- error
 	done           <-chan struct{}
 }
 
-func newgRPCClientStream(originalStream grpc.ClientStream, desc *grpc.StreamDesc, finished chan<- error, done <-chan struct{}) grpc.ClientStream {
+func newgRPCClientStream(originalStream grpc.ClientStream, desc *grpc.StreamDesc, span trace.Span, finished chan<- error, done <-chan struct{}) grpc.ClientStream {
 	return &clientStream{
 		originalStream: originalStream,
 		desc:           desc,
+		span:           span,
 		finished:       finished,
 		done:           done,
 	}
@@ -39,6 +44,7 @@ func (cs *clientStream) Trailer() metadata.MD {
 }
 
 func (cs *clientStream) CloseSend() error {
+	cs.span.AddEvent("client.stream.close.send.start")
 	err := cs.originalStream.CloseSend()
 	if err != nil {
 		select {
@@ -46,6 +52,7 @@ func (cs *clientStream) CloseSend() error {
 		case cs.finished <- err:
 		}
 	}
+	cs.span.AddEvent("client.stream.close.send.finish")
 	return err
 }
 
@@ -54,6 +61,9 @@ func (cs *clientStream) Context() context.Context {
 }
 
 func (cs *clientStream) SendMsg(m any) error {
+	cs.span.AddEvent("client.stream.send.msg.start", trace.WithAttributes(
+		attribute.String("message.type", fmt.Sprintf("%T", m))),
+	)
 	err := cs.originalStream.SendMsg(m)
 	if err != nil {
 		select {
@@ -61,10 +71,16 @@ func (cs *clientStream) SendMsg(m any) error {
 		case cs.finished <- err:
 		}
 	}
+	cs.span.AddEvent("client.stream.send.msg.finish", trace.WithAttributes(
+		attribute.String("message.type", fmt.Sprintf("%T", m))),
+	)
 	return err
 }
 
 func (cs *clientStream) RecvMsg(m any) error {
+	cs.span.AddEvent("client.stream.receive.msg.start", trace.WithAttributes(
+		attribute.String("message.type", fmt.Sprintf("%T", m))),
+	)
 	err := cs.originalStream.RecvMsg(m)
 	if err != nil || !cs.desc.ServerStreams {
 		select {
@@ -72,5 +88,8 @@ func (cs *clientStream) RecvMsg(m any) error {
 		case cs.finished <- err:
 		}
 	}
+	cs.span.AddEvent("client.stream.receive.msg.finish", trace.WithAttributes(
+		attribute.String("message.type", fmt.Sprintf("%T", m))),
+	)
 	return err
 }

tracing/grpc/interceptors.go

@@ -50,7 +50,7 @@ func NewStreamClientInterceptor() grpc.StreamClientInterceptor {
 
 		finished := make(chan error)
 		done := make(chan struct{})
-		strWrp := newgRPCClientStream(str, desc, finished, done)
+		strWrp := newgRPCClientStream(str, desc, span, finished, done)
 
 		go func() {
 			defer close(done)
@@ -107,7 +107,7 @@ func NewStreamServerInterceptor() grpc.StreamServerInterceptor {
 			trace.WithSpanKind(trace.SpanKindServer))
 		defer span.End()
 
-		err := handler(srv, newgRPCServerStream(ctx, ss))
+		err := handler(srv, newgRPCServerStream(ctx, ss, span))
 
 		setGRPCSpanStatus(span, err)
 		return err

tracing/grpc/server.go

@@ -2,7 +2,10 @@ package grpc
 
 import (
 	"context"
+	"fmt"
 
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/trace"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/metadata"
 )
@@ -10,12 +13,14 @@ import (
 type serverStream struct {
 	originalStream grpc.ServerStream
 	ctx            context.Context // nolint:containedctx
+	span           trace.Span
 }
 
-func newgRPCServerStream(ctx context.Context, originalStream grpc.ServerStream) grpc.ServerStream {
+func newgRPCServerStream(ctx context.Context, originalStream grpc.ServerStream, span trace.Span) grpc.ServerStream {
 	return &serverStream{
 		originalStream: originalStream,
 		ctx:            ctx,
+		span:           span,
 	}
 }
 
@@ -36,9 +41,23 @@ func (ss *serverStream) Context() context.Context {
 }
 
 func (ss *serverStream) SendMsg(m any) error {
-	return ss.originalStream.SendMsg(m)
+	ss.span.AddEvent("server.stream.send.msg.start", trace.WithAttributes(
+		attribute.String("message.type", fmt.Sprintf("%T", m))),
+	)
+	err := ss.originalStream.SendMsg(m)
+	ss.span.AddEvent("server.stream.send.msg.finish", trace.WithAttributes(
+		attribute.String("message.type", fmt.Sprintf("%T", m))),
+	)
+	return err
 }
 
 func (ss *serverStream) RecvMsg(m any) error {
-	return ss.originalStream.RecvMsg(m)
+	ss.span.AddEvent("server.stream.receive.msg.start", trace.WithAttributes(
+		attribute.String("message.type", fmt.Sprintf("%T", m))),
+	)
+	err := ss.originalStream.RecvMsg(m)
+	ss.span.AddEvent("server.stream.receive.msg.finish", trace.WithAttributes(
+		attribute.String("message.type", fmt.Sprintf("%T", m))),
+	)
+	return err
 }

tracing/setup.go

@@ -2,6 +2,8 @@ package tracing
 
 import (
 	"context"
+	"crypto/x509"
+	"errors"
 	"fmt"
 	"sync"
 	"sync/atomic"
@@ -15,8 +17,12 @@ import (
 	semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
 	"go.opentelemetry.io/otel/trace"
 	"go.opentelemetry.io/otel/trace/noop"
+	"google.golang.org/grpc/credentials"
 )
 
+// ErrEmptyServerRootCaPool indicates that cert pool is empty and does not have any certificates inside.
+var ErrEmptyServerRootCaPool = errors.New("empty server root ca cert pool")
+
 var (
 	// tracingLock protects provider, done, config and tracer from concurrent update.
 	// These fields change when the config is updated or the application is shutdown.
@@ -135,7 +141,14 @@ func getExporter(ctx context.Context, cfg *Config) (sdktrace.SpanExporter, error
 	case NoOpExporter:
 		return tracetest.NewNoopExporter(), nil
 	case OTLPgRPCExporter:
-		return otlptracegrpc.New(ctx, otlptracegrpc.WithEndpoint(cfg.Endpoint), otlptracegrpc.WithInsecure())
+		securityOption := otlptracegrpc.WithInsecure()
+		if cfg.ServerCaCertPool != nil {
+			if cfg.ServerCaCertPool.Equal(x509.NewCertPool()) {
+				return nil, fmt.Errorf("failed to setup tracing: %w", ErrEmptyServerRootCaPool)
+			}
+			securityOption = otlptracegrpc.WithTLSCredentials(credentials.NewClientTLSFromCert(cfg.ServerCaCertPool, ""))
+		}
+		return otlptracegrpc.New(ctx, otlptracegrpc.WithEndpoint(cfg.Endpoint), securityOption)
 	}
 }
 
@@ -149,6 +162,9 @@ func newResource(cfg *Config) *resource.Resource {
 	if len(cfg.InstanceID) > 0 {
 		attrs = append(attrs, semconv.ServiceInstanceID(cfg.InstanceID))
 	}
+	for k, v := range cfg.Attributes {
+		attrs = append(attrs, attribute.String(k, v))
+	}
 	return resource.NewWithAttributes(
 		semconv.SchemaURL,
 		attrs...,

tracing/setup_test.go

@@ -0,0 +1,118 @@
+package tracing_test
+
+import (
+	"context"
+	"crypto/x509"
+	"os"
+	"testing"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSetup(t *testing.T) {
+	tests := []struct {
+		name   string
+		config tracing.Config
+		want   bool
+		expErr error
+	}{
+		{
+			name: "setup stdout exporter",
+			config: tracing.Config{
+				Enabled:  true,
+				Exporter: tracing.StdoutExporter,
+				Service:  "service-name",
+			},
+			want:   true,
+			expErr: nil,
+		},
+		{
+			name: "setup noop exporter",
+			config: tracing.Config{
+				Enabled:  true,
+				Exporter: tracing.NoOpExporter,
+				Service:  "service-name",
+			},
+
+			want:   true,
+			expErr: nil,
+		},
+		{
+			name: "setup otlp_grpc insecure exporter",
+			config: tracing.Config{
+				Enabled:  true,
+				Exporter: tracing.OTLPgRPCExporter,
+				Service:  "service-name",
+				Endpoint: "test-endpoint.com:4317",
+			},
+			want:   true,
+			expErr: nil,
+		},
+		{
+			name: "setup otlp_grpc secure exporter with valid rsa root ca certificate",
+			config: tracing.Config{
+				Enabled:          true,
+				Exporter:         tracing.OTLPgRPCExporter,
+				Service:          "service-name",
+				Endpoint:         "test-endpoint.com:4317",
+				ServerCaCertPool: readCertPoolByPath(t, "../testdata/tracing/valid_google_globalsign_r4_rsa_root_ca.pem"),
+			},
+			want:   true,
+			expErr: nil,
+		},
+		{
+			name: "setup otlp_grpc secure exporter with valid ecdsa root ca certificate",
+			config: tracing.Config{
+				Enabled:          true,
+				Exporter:         tracing.OTLPgRPCExporter,
+				Service:          "service-name",
+				Endpoint:         "test-endpoint.com:4317",
+				ServerCaCertPool: readCertPoolByPath(t, "../testdata/tracing/valid_google_gts_r4_ecdsa_root_ca.pem"),
+			},
+			want:   true,
+			expErr: nil,
+		},
+		{
+			name: "setup otlp_grpc secure exporter with invalid root ca certificate",
+			config: tracing.Config{
+				Enabled:          true,
+				Exporter:         tracing.OTLPgRPCExporter,
+				Service:          "service-name",
+				Endpoint:         "test-endpoint.com:4317",
+				ServerCaCertPool: readCertPoolByPath(t, "../testdata/tracing/invalid_root_ca.pem"),
+			},
+			want:   false,
+			expErr: tracing.ErrEmptyServerRootCaPool,
+		},
+		{
+			name: "setup otlp_grpc secure exporter with empty root ca certificate",
+			config: tracing.Config{
+				Enabled:          true,
+				Exporter:         tracing.OTLPgRPCExporter,
+				Service:          "service-name",
+				Endpoint:         "test-endpoint.com:4317",
+				ServerCaCertPool: readCertPoolByPath(t, "../testdata/tracing/invalid_empty_root_ca.pem"),
+			},
+			want:   false,
+			expErr: tracing.ErrEmptyServerRootCaPool,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := tracing.Setup(context.Background(), tt.config)
+			require.ErrorIs(t, err, tt.expErr)
+			if got != tt.want {
+				t.Errorf("Setup config = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func readCertPoolByPath(t *testing.T, path string) *x509.CertPool {
+	ca, err := os.ReadFile(path)
+	require.NoError(t, err)
+	roots := x509.NewCertPool()
+	_ = roots.AppendCertsFromPEM(ca)
+	return roots
+}