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// Copyright 2022 The OpenZipkin 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 zipkin_proto3
import (
"encoding/binary"
"errors"
"time"
zipkinmodel "github.com/openzipkin/zipkin-go/model"
"google.golang.org/protobuf/proto"
)
var errNilProtoSpan = errors.New("expecting a non-nil Span")
// SpanSerializer implements http.SpanSerializer
type SpanSerializer struct{}
// Serialize takes an array of zipkin SpanModel objects and serializes it to a protobuf blob.
func (SpanSerializer) Serialize(sms []*zipkinmodel.SpanModel) (protoBlob []byte, err error) {
var listOfSpans ListOfSpans
for _, sm := range sms {
sp, err := modelSpanToProtoSpan(sm)
if err != nil {
return nil, err
}
listOfSpans.Spans = append(listOfSpans.Spans, sp)
}
return proto.Marshal(&listOfSpans)
}
// ContentType returns the ContentType needed for this encoding.
func (SpanSerializer) ContentType() string {
return "application/x-protobuf"
}
func modelSpanToProtoSpan(sm *zipkinmodel.SpanModel) (*Span, error) {
if sm == nil {
return nil, errNilProtoSpan
}
traceID := make([]byte, 16)
binary.BigEndian.PutUint64(traceID[0:8], uint64(sm.TraceID.High))
binary.BigEndian.PutUint64(traceID[8:16], uint64(sm.TraceID.Low))
parentID := make([]byte, 8)
if sm.ParentID != nil {
binary.BigEndian.PutUint64(parentID, uint64(*sm.ParentID))
}
id := make([]byte, 8)
binary.BigEndian.PutUint64(id, uint64(sm.ID))
var timeStamp uint64
if !sm.Timestamp.IsZero() {
timeStamp = uint64(sm.Timestamp.Round(time.Microsecond).UnixNano() / 1e3)
}
return &Span{
TraceId: traceID,
ParentId: parentID,
Id: id,
Debug: sm.Debug,
Kind: Span_Kind(Span_Kind_value[string(sm.Kind)]),
Name: sm.Name,
Timestamp: timeStamp,
Tags: sm.Tags,
Duration: uint64(sm.Duration.Nanoseconds() / 1e3),
LocalEndpoint: modelEndpointToProtoEndpoint(sm.LocalEndpoint),
RemoteEndpoint: modelEndpointToProtoEndpoint(sm.RemoteEndpoint),
Shared: sm.Shared,
Annotations: modelAnnotationsToProtoAnnotations(sm.Annotations),
}, nil
}
func durationToMicros(d time.Duration) (uint64, error) {
if d < time.Microsecond {
if d < 0 {
return 0, zipkinmodel.ErrValidDurationRequired
} else if d > 0 {
d = 1 * time.Microsecond
}
} else {
d += 500 * time.Nanosecond
}
return uint64(d.Nanoseconds() / 1e3), nil
}
func modelEndpointToProtoEndpoint(ep *zipkinmodel.Endpoint) *Endpoint {
if ep == nil {
return nil
}
return &Endpoint{
ServiceName: ep.ServiceName,
Ipv4: []byte(ep.IPv4),
Ipv6: []byte(ep.IPv6),
Port: int32(ep.Port),
}
}
func modelAnnotationsToProtoAnnotations(mas []zipkinmodel.Annotation) (pas []*Annotation) {
for _, ma := range mas {
pas = append(pas, &Annotation{
Timestamp: timeToMicros(ma.Timestamp),
Value: ma.Value,
})
}
return
}
func timeToMicros(t time.Time) uint64 {
if t.IsZero() {
return 0
}
return uint64(t.UnixNano()) / 1e3
}
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