/
tracing.go
46 lines (37 loc) · 1.2 KB
/
tracing.go
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package grpcbp
import (
"context"
"strconv"
"strings"
"google.golang.org/grpc/metadata"
"github.com/reddit/baseplate.go/tracing"
"github.com/reddit/baseplate.go/transport"
)
// CreateGRPCContextFromSpan injects span info into a context object that can
// be used in gRPC client code.
func CreateGRPCContextFromSpan(ctx context.Context, span *tracing.Span) context.Context {
kvs := []string{
transport.HeaderTracingTrace, span.TraceID(),
transport.HeaderTracingSpan, span.ID(),
transport.HeaderTracingFlags, strconv.FormatInt(span.Flags(), 10),
}
if span.ParentID() != "" {
kvs = append(kvs, transport.HeaderTracingParent, span.ParentID())
} else {
md, _ := metadata.FromIncomingContext(ctx)
md.Delete(transport.HeaderTracingParent)
ctx = metadata.NewOutgoingContext(ctx, md)
}
if span.Sampled() {
kvs = append(kvs, transport.HeaderTracingSampled, transport.HeaderTracingSampledTrue)
} else {
md, _ := metadata.FromIncomingContext(ctx)
md.Delete(transport.HeaderTracingSampled)
ctx = metadata.NewOutgoingContext(ctx, md)
}
return metadata.AppendToOutgoingContext(ctx, kvs...)
}
func methodSlug(method string) string {
split := strings.Split(method, "/")
return split[len(split)-1]
}