diff --git a/vendor/go.opentelemetry.io/otel/api/trace/span_context.go b/vendor/go.opentelemetry.io/otel/api/trace/span_context.go
new file mode 100644
index 0000000..914ce5f
--- /dev/null
+++ b/vendor/go.opentelemetry.io/otel/api/trace/span_context.go
@@ -0,0 +1,197 @@
+// Copyright The OpenTelemetry Authors
+//
+// 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.
+
+package trace
+
+import (
+	"bytes"
+	"encoding/hex"
+	"encoding/json"
+)
+
+const (
+	// FlagsSampled is a bitmask with the sampled bit set. A SpanContext
+	// with the sampling bit set means the span is sampled.
+	FlagsSampled = byte(0x01)
+	// FlagsDeferred is a bitmask with the deferred bit set. A SpanContext
+	// with the deferred bit set means the sampling decision has been
+	// defered to the receiver.
+	FlagsDeferred = byte(0x02)
+	// FlagsDebug is a bitmask with the debug bit set.
+	FlagsDebug = byte(0x04)
+
+	ErrInvalidHexID errorConst = "trace-id and span-id can only contain [0-9a-f] characters, all lowercase"
+
+	ErrInvalidTraceIDLength errorConst = "hex encoded trace-id must have length equals to 32"
+	ErrNilTraceID           errorConst = "trace-id can't be all zero"
+
+	ErrInvalidSpanIDLength errorConst = "hex encoded span-id must have length equals to 16"
+	ErrNilSpanID           errorConst = "span-id can't be all zero"
+)
+
+type errorConst string
+
+func (e errorConst) Error() string {
+	return string(e)
+}
+
+// ID is a unique identity of a trace.
+type ID [16]byte
+
+var nilTraceID ID
+var _ json.Marshaler = nilTraceID
+
+// IsValid checks whether the trace ID is valid. A valid trace ID does
+// not consist of zeros only.
+func (t ID) IsValid() bool {
+	return !bytes.Equal(t[:], nilTraceID[:])
+}
+
+// MarshalJSON implements a custom marshal function to encode TraceID
+// as a hex string.
+func (t ID) MarshalJSON() ([]byte, error) {
+	return json.Marshal(t.String())
+}
+
+// String returns the hex string representation form of a TraceID
+func (t ID) String() string {
+	return hex.EncodeToString(t[:])
+}
+
+// SpanID is a unique identify of a span in a trace.
+type SpanID [8]byte
+
+var nilSpanID SpanID
+var _ json.Marshaler = nilSpanID
+
+// IsValid checks whether the span ID is valid. A valid span ID does
+// not consist of zeros only.
+func (s SpanID) IsValid() bool {
+	return !bytes.Equal(s[:], nilSpanID[:])
+}
+
+// MarshalJSON implements a custom marshal function to encode SpanID
+// as a hex string.
+func (s SpanID) MarshalJSON() ([]byte, error) {
+	return json.Marshal(s.String())
+}
+
+// String returns the hex string representation form of a SpanID
+func (s SpanID) String() string {
+	return hex.EncodeToString(s[:])
+}
+
+// IDFromHex returns a TraceID from a hex string if it is compliant
+// with the w3c trace-context specification.
+// See more at https://www.w3.org/TR/trace-context/#trace-id
+func IDFromHex(h string) (ID, error) {
+	t := ID{}
+	if len(h) != 32 {
+		return t, ErrInvalidTraceIDLength
+	}
+
+	if err := decodeHex(h, t[:]); err != nil {
+		return t, err
+	}
+
+	if !t.IsValid() {
+		return t, ErrNilTraceID
+	}
+	return t, nil
+}
+
+// SpanIDFromHex returns a SpanID from a hex string if it is compliant
+// with the w3c trace-context specification.
+// See more at https://www.w3.org/TR/trace-context/#parent-id
+func SpanIDFromHex(h string) (SpanID, error) {
+	s := SpanID{}
+	if len(h) != 16 {
+		return s, ErrInvalidSpanIDLength
+	}
+
+	if err := decodeHex(h, s[:]); err != nil {
+		return s, err
+	}
+
+	if !s.IsValid() {
+		return s, ErrNilSpanID
+	}
+	return s, nil
+}
+
+func decodeHex(h string, b []byte) error {
+	for _, r := range h {
+		switch {
+		case 'a' <= r && r <= 'f':
+			continue
+		case '0' <= r && r <= '9':
+			continue
+		default:
+			return ErrInvalidHexID
+		}
+	}
+
+	decoded, err := hex.DecodeString(h)
+	if err != nil {
+		return err
+	}
+
+	copy(b, decoded)
+	return nil
+}
+
+// SpanContext contains basic information about the span - its trace
+// ID, span ID and trace flags.
+type SpanContext struct {
+	TraceID    ID
+	SpanID     SpanID
+	TraceFlags byte
+}
+
+// EmptySpanContext is meant for internal use to return invalid span
+// context during error conditions.
+func EmptySpanContext() SpanContext {
+	return SpanContext{}
+}
+
+// IsValid checks if the span context is valid. A valid span context
+// has a valid trace ID and a valid span ID.
+func (sc SpanContext) IsValid() bool {
+	return sc.HasTraceID() && sc.HasSpanID()
+}
+
+// HasTraceID checks if the span context has a valid trace ID.
+func (sc SpanContext) HasTraceID() bool {
+	return sc.TraceID.IsValid()
+}
+
+// HasSpanID checks if the span context has a valid span ID.
+func (sc SpanContext) HasSpanID() bool {
+	return sc.SpanID.IsValid()
+}
+
+// IsDeferred returns if the deferred bit is set in the trace flags.
+func (sc SpanContext) IsDeferred() bool {
+	return sc.TraceFlags&FlagsDeferred == FlagsDeferred
+}
+
+// IsDebug returns if the debug bit is set in the trace flags.
+func (sc SpanContext) IsDebug() bool {
+	return sc.TraceFlags&FlagsDebug == FlagsDebug
+}
+
+// IsSampled returns if the sampling bit is set in the trace flags.
+func (sc SpanContext) IsSampled() bool {
+	return sc.TraceFlags&FlagsSampled == FlagsSampled
+}