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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package otelgrpc // import "go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
// gRPC tracing middleware
// https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/semantic_conventions/rpc.md
import (
"context"
"errors"
"io"
"net"
"strconv"
"time"
"google.golang.org/grpc"
grpc_codes "google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/peer"
"google.golang.org/grpc/status"
"google.golang.org/protobuf/proto"
"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc/internal"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/codes"
"go.opentelemetry.io/otel/metric"
semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
"go.opentelemetry.io/otel/trace"
)
type messageType attribute.KeyValue
// Event adds an event of the messageType to the span associated with the
// passed context with a message id.
func (m messageType) Event(ctx context.Context, id int, _ interface{}) {
span := trace.SpanFromContext(ctx)
if !span.IsRecording() {
return
}
span.AddEvent("message", trace.WithAttributes(
attribute.KeyValue(m),
RPCMessageIDKey.Int(id),
))
}
var (
messageSent = messageType(RPCMessageTypeSent)
messageReceived = messageType(RPCMessageTypeReceived)
)
// UnaryClientInterceptor returns a grpc.UnaryClientInterceptor suitable
// for use in a grpc.NewClient call.
//
// Deprecated: Use [NewClientHandler] instead.
func UnaryClientInterceptor(opts ...Option) grpc.UnaryClientInterceptor {
cfg := newConfig(opts, "client")
tracer := cfg.TracerProvider.Tracer(
ScopeName,
trace.WithInstrumentationVersion(Version()),
)
return func(
ctx context.Context,
method string,
req, reply interface{},
cc *grpc.ClientConn,
invoker grpc.UnaryInvoker,
callOpts ...grpc.CallOption,
) error {
i := &InterceptorInfo{
Method: method,
Type: UnaryClient,
}
if cfg.InterceptorFilter != nil && !cfg.InterceptorFilter(i) {
return invoker(ctx, method, req, reply, cc, callOpts...)
}
name, attr, _ := telemetryAttributes(method, cc.Target())
startOpts := append([]trace.SpanStartOption{
trace.WithSpanKind(trace.SpanKindClient),
trace.WithAttributes(attr...),
},
cfg.SpanStartOptions...,
)
ctx, span := tracer.Start(
ctx,
name,
startOpts...,
)
defer span.End()
ctx = inject(ctx, cfg.Propagators)
if cfg.SentEvent {
messageSent.Event(ctx, 1, req)
}
err := invoker(ctx, method, req, reply, cc, callOpts...)
if cfg.ReceivedEvent {
messageReceived.Event(ctx, 1, reply)
}
if err != nil {
s, _ := status.FromError(err)
span.SetStatus(codes.Error, s.Message())
span.SetAttributes(statusCodeAttr(s.Code()))
} else {
span.SetAttributes(statusCodeAttr(grpc_codes.OK))
}
return err
}
}
// clientStream wraps around the embedded grpc.ClientStream, and intercepts the RecvMsg and
// SendMsg method call.
type clientStream struct {
grpc.ClientStream
desc *grpc.StreamDesc
span trace.Span
receivedEvent bool
sentEvent bool
receivedMessageID int
sentMessageID int
}
var _ = proto.Marshal
func (w *clientStream) RecvMsg(m interface{}) error {
err := w.ClientStream.RecvMsg(m)
if err == nil && !w.desc.ServerStreams {
w.endSpan(nil)
} else if errors.Is(err, io.EOF) {
w.endSpan(nil)
} else if err != nil {
w.endSpan(err)
} else {
w.receivedMessageID++
if w.receivedEvent {
messageReceived.Event(w.Context(), w.receivedMessageID, m)
}
}
return err
}
func (w *clientStream) SendMsg(m interface{}) error {
err := w.ClientStream.SendMsg(m)
w.sentMessageID++
if w.sentEvent {
messageSent.Event(w.Context(), w.sentMessageID, m)
}
if err != nil {
w.endSpan(err)
}
return err
}
func (w *clientStream) Header() (metadata.MD, error) {
md, err := w.ClientStream.Header()
if err != nil {
w.endSpan(err)
}
return md, err
}
func (w *clientStream) CloseSend() error {
err := w.ClientStream.CloseSend()
if err != nil {
w.endSpan(err)
}
return err
}
func wrapClientStream(s grpc.ClientStream, desc *grpc.StreamDesc, span trace.Span, cfg *config) *clientStream {
return &clientStream{
ClientStream: s,
span: span,
desc: desc,
receivedEvent: cfg.ReceivedEvent,
sentEvent: cfg.SentEvent,
}
}
func (w *clientStream) endSpan(err error) {
if err != nil {
s, _ := status.FromError(err)
w.span.SetStatus(codes.Error, s.Message())
w.span.SetAttributes(statusCodeAttr(s.Code()))
} else {
w.span.SetAttributes(statusCodeAttr(grpc_codes.OK))
}
w.span.End()
}
// StreamClientInterceptor returns a grpc.StreamClientInterceptor suitable
// for use in a grpc.NewClient call.
//
// Deprecated: Use [NewClientHandler] instead.
func StreamClientInterceptor(opts ...Option) grpc.StreamClientInterceptor {
cfg := newConfig(opts, "client")
tracer := cfg.TracerProvider.Tracer(
ScopeName,
trace.WithInstrumentationVersion(Version()),
)
return func(
ctx context.Context,
desc *grpc.StreamDesc,
cc *grpc.ClientConn,
method string,
streamer grpc.Streamer,
callOpts ...grpc.CallOption,
) (grpc.ClientStream, error) {
i := &InterceptorInfo{
Method: method,
Type: StreamClient,
}
if cfg.InterceptorFilter != nil && !cfg.InterceptorFilter(i) {
return streamer(ctx, desc, cc, method, callOpts...)
}
name, attr, _ := telemetryAttributes(method, cc.Target())
startOpts := append([]trace.SpanStartOption{
trace.WithSpanKind(trace.SpanKindClient),
trace.WithAttributes(attr...),
},
cfg.SpanStartOptions...,
)
ctx, span := tracer.Start(
ctx,
name,
startOpts...,
)
ctx = inject(ctx, cfg.Propagators)
s, err := streamer(ctx, desc, cc, method, callOpts...)
if err != nil {
grpcStatus, _ := status.FromError(err)
span.SetStatus(codes.Error, grpcStatus.Message())
span.SetAttributes(statusCodeAttr(grpcStatus.Code()))
span.End()
return s, err
}
stream := wrapClientStream(s, desc, span, cfg)
return stream, nil
}
}
// UnaryServerInterceptor returns a grpc.UnaryServerInterceptor suitable
// for use in a grpc.NewServer call.
//
// Deprecated: Use [NewServerHandler] instead.
func UnaryServerInterceptor(opts ...Option) grpc.UnaryServerInterceptor {
cfg := newConfig(opts, "server")
tracer := cfg.TracerProvider.Tracer(
ScopeName,
trace.WithInstrumentationVersion(Version()),
)
return func(
ctx context.Context,
req interface{},
info *grpc.UnaryServerInfo,
handler grpc.UnaryHandler,
) (interface{}, error) {
i := &InterceptorInfo{
UnaryServerInfo: info,
Type: UnaryServer,
}
if cfg.InterceptorFilter != nil && !cfg.InterceptorFilter(i) {
return handler(ctx, req)
}
ctx = extract(ctx, cfg.Propagators)
name, attr, metricAttrs := telemetryAttributes(info.FullMethod, peerFromCtx(ctx))
startOpts := append([]trace.SpanStartOption{
trace.WithSpanKind(trace.SpanKindServer),
trace.WithAttributes(attr...),
},
cfg.SpanStartOptions...,
)
ctx, span := tracer.Start(
trace.ContextWithRemoteSpanContext(ctx, trace.SpanContextFromContext(ctx)),
name,
startOpts...,
)
defer span.End()
if cfg.ReceivedEvent {
messageReceived.Event(ctx, 1, req)
}
before := time.Now()
resp, err := handler(ctx, req)
s, _ := status.FromError(err)
if err != nil {
statusCode, msg := serverStatus(s)
span.SetStatus(statusCode, msg)
if cfg.SentEvent {
messageSent.Event(ctx, 1, s.Proto())
}
} else {
if cfg.SentEvent {
messageSent.Event(ctx, 1, resp)
}
}
grpcStatusCodeAttr := statusCodeAttr(s.Code())
span.SetAttributes(grpcStatusCodeAttr)
// Use floating point division here for higher precision (instead of Millisecond method).
elapsedTime := float64(time.Since(before)) / float64(time.Millisecond)
metricAttrs = append(metricAttrs, grpcStatusCodeAttr)
cfg.rpcDuration.Record(ctx, elapsedTime, metric.WithAttributeSet(attribute.NewSet(metricAttrs...)))
return resp, err
}
}
// serverStream wraps around the embedded grpc.ServerStream, and intercepts the RecvMsg and
// SendMsg method call.
type serverStream struct {
grpc.ServerStream
ctx context.Context
receivedMessageID int
sentMessageID int
receivedEvent bool
sentEvent bool
}
func (w *serverStream) Context() context.Context {
return w.ctx
}
func (w *serverStream) RecvMsg(m interface{}) error {
err := w.ServerStream.RecvMsg(m)
if err == nil {
w.receivedMessageID++
if w.receivedEvent {
messageReceived.Event(w.Context(), w.receivedMessageID, m)
}
}
return err
}
func (w *serverStream) SendMsg(m interface{}) error {
err := w.ServerStream.SendMsg(m)
w.sentMessageID++
if w.sentEvent {
messageSent.Event(w.Context(), w.sentMessageID, m)
}
return err
}
func wrapServerStream(ctx context.Context, ss grpc.ServerStream, cfg *config) *serverStream {
return &serverStream{
ServerStream: ss,
ctx: ctx,
receivedEvent: cfg.ReceivedEvent,
sentEvent: cfg.SentEvent,
}
}
// StreamServerInterceptor returns a grpc.StreamServerInterceptor suitable
// for use in a grpc.NewServer call.
//
// Deprecated: Use [NewServerHandler] instead.
func StreamServerInterceptor(opts ...Option) grpc.StreamServerInterceptor {
cfg := newConfig(opts, "server")
tracer := cfg.TracerProvider.Tracer(
ScopeName,
trace.WithInstrumentationVersion(Version()),
)
return func(
srv interface{},
ss grpc.ServerStream,
info *grpc.StreamServerInfo,
handler grpc.StreamHandler,
) error {
ctx := ss.Context()
i := &InterceptorInfo{
StreamServerInfo: info,
Type: StreamServer,
}
if cfg.InterceptorFilter != nil && !cfg.InterceptorFilter(i) {
return handler(srv, wrapServerStream(ctx, ss, cfg))
}
ctx = extract(ctx, cfg.Propagators)
name, attr, _ := telemetryAttributes(info.FullMethod, peerFromCtx(ctx))
startOpts := append([]trace.SpanStartOption{
trace.WithSpanKind(trace.SpanKindServer),
trace.WithAttributes(attr...),
},
cfg.SpanStartOptions...,
)
ctx, span := tracer.Start(
trace.ContextWithRemoteSpanContext(ctx, trace.SpanContextFromContext(ctx)),
name,
startOpts...,
)
defer span.End()
err := handler(srv, wrapServerStream(ctx, ss, cfg))
if err != nil {
s, _ := status.FromError(err)
statusCode, msg := serverStatus(s)
span.SetStatus(statusCode, msg)
span.SetAttributes(statusCodeAttr(s.Code()))
} else {
span.SetAttributes(statusCodeAttr(grpc_codes.OK))
}
return err
}
}
// telemetryAttributes returns a span name and span and metric attributes from
// the gRPC method and peer address.
func telemetryAttributes(fullMethod, peerAddress string) (string, []attribute.KeyValue, []attribute.KeyValue) {
name, methodAttrs := internal.ParseFullMethod(fullMethod)
peerAttrs := peerAttr(peerAddress)
attrs := make([]attribute.KeyValue, 0, 1+len(methodAttrs)+len(peerAttrs))
attrs = append(attrs, RPCSystemGRPC)
attrs = append(attrs, methodAttrs...)
metricAttrs := attrs[:1+len(methodAttrs)]
attrs = append(attrs, peerAttrs...)
return name, attrs, metricAttrs
}
// peerAttr returns attributes about the peer address.
func peerAttr(addr string) []attribute.KeyValue {
host, p, err := net.SplitHostPort(addr)
if err != nil {
return nil
}
if host == "" {
host = "127.0.0.1"
}
port, err := strconv.Atoi(p)
if err != nil {
return nil
}
var attr []attribute.KeyValue
if ip := net.ParseIP(host); ip != nil {
attr = []attribute.KeyValue{
semconv.NetSockPeerAddr(host),
semconv.NetSockPeerPort(port),
}
} else {
attr = []attribute.KeyValue{
semconv.NetPeerName(host),
semconv.NetPeerPort(port),
}
}
return attr
}
// peerFromCtx returns a peer address from a context, if one exists.
func peerFromCtx(ctx context.Context) string {
p, ok := peer.FromContext(ctx)
if !ok {
return ""
}
return p.Addr.String()
}
// statusCodeAttr returns status code attribute based on given gRPC code.
func statusCodeAttr(c grpc_codes.Code) attribute.KeyValue {
return GRPCStatusCodeKey.Int64(int64(c))
}
// serverStatus returns a span status code and message for a given gRPC
// status code. It maps specific gRPC status codes to a corresponding span
// status code and message. This function is intended for use on the server
// side of a gRPC connection.
//
// If the gRPC status code is Unknown, DeadlineExceeded, Unimplemented,
// Internal, Unavailable, or DataLoss, it returns a span status code of Error
// and the message from the gRPC status. Otherwise, it returns a span status
// code of Unset and an empty message.
func serverStatus(grpcStatus *status.Status) (codes.Code, string) {
switch grpcStatus.Code() {
case grpc_codes.Unknown,
grpc_codes.DeadlineExceeded,
grpc_codes.Unimplemented,
grpc_codes.Internal,
grpc_codes.Unavailable,
grpc_codes.DataLoss:
return codes.Error, grpcStatus.Message()
default:
return codes.Unset, ""
}
}
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