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grpc.go
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grpc.go
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//go:generate protoc -I . fixtures_test.proto --go_out=plugins=grpc:.
// Package grpc provides functions to trace the google.golang.org/grpc package v1.2.
package grpc // import "gopkg.in/DataDog/dd-trace-go.v1/contrib/google.golang.org/grpc"
import (
"io"
"gopkg.in/DataDog/dd-trace-go.v1/contrib/google.golang.org/internal/grpcutil"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/ext"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
context "golang.org/x/net/context"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status"
)
func startSpanFromContext(ctx context.Context, method, operation, service string) (ddtrace.Span, context.Context) {
opts := []ddtrace.StartSpanOption{
tracer.ServiceName(service),
tracer.ResourceName(method),
tracer.Tag(tagMethod, method),
tracer.SpanType(ext.AppTypeRPC),
}
md, _ := metadata.FromIncomingContext(ctx) // nil is ok
if sctx, err := tracer.Extract(grpcutil.MDCarrier(md)); err == nil {
opts = append(opts, tracer.ChildOf(sctx))
}
return tracer.StartSpanFromContext(ctx, operation, opts...)
}
// withStreamError returns a tracer.WithError finish option, disregarding OK, EOF and Canceled errors.
func withStreamError(err error) tracer.FinishOption {
errcode := status.Code(err)
if err == io.EOF || errcode == codes.Canceled || errcode == codes.OK || err == context.Canceled {
err = nil
}
return tracer.WithError(err)
}