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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 model
import (
"fmt"
"strconv"
)
// TraceID is a 128 bit number internally stored as 2x uint64 (high & low).
// In case of 64 bit traceIDs, the value can be found in Low.
type TraceID struct {
High uint64
Low uint64
}
// Empty returns if TraceID has zero value.
func (t TraceID) Empty() bool {
return t.Low == 0 && t.High == 0
}
// String outputs the 128-bit traceID as hex string.
func (t TraceID) String() string {
if t.High == 0 {
return fmt.Sprintf("%016x", t.Low)
}
return fmt.Sprintf("%016x%016x", t.High, t.Low)
}
// TraceIDFromHex returns the TraceID from a hex string.
func TraceIDFromHex(h string) (t TraceID, err error) {
if len(h) > 16 {
if t.High, err = strconv.ParseUint(h[0:len(h)-16], 16, 64); err != nil {
return
}
t.Low, err = strconv.ParseUint(h[len(h)-16:], 16, 64)
return
}
t.Low, err = strconv.ParseUint(h, 16, 64)
return
}
// MarshalJSON custom JSON serializer to export the TraceID in the required
// zero padded hex representation.
func (t TraceID) MarshalJSON() ([]byte, error) {
return []byte(fmt.Sprintf("%q", t.String())), nil
}
// UnmarshalJSON custom JSON deserializer to retrieve the traceID from the hex
// encoded representation.
func (t *TraceID) UnmarshalJSON(traceID []byte) error {
if len(traceID) < 3 {
return ErrValidTraceIDRequired
}
// A valid JSON string is encoded wrapped in double quotes. We need to trim
// these before converting the hex payload.
tID, err := TraceIDFromHex(string(traceID[1 : len(traceID)-1]))
if err != nil {
return err
}
*t = tID
return nil
}
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