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bytesid.go
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bytesid.go
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// 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 data
import (
"encoding/hex"
"errors"
"fmt"
)
// marshalJSON converts trace id into a hex string enclosed in quotes.
// Called by Protobuf JSON deserialization.
func marshalJSON(id []byte) ([]byte, error) {
if len(id) == 0 {
return []byte(`""`), nil
}
// 2 chars per byte plus 2 quote chars at the start and end.
hexLen := 2*len(id) + 2
b := make([]byte, hexLen)
hex.Encode(b[1:hexLen-1], id)
b[0], b[hexLen-1] = '"', '"'
return b, nil
}
// unmarshalJSON inflates trace id from hex string, possibly enclosed in quotes.
// Called by Protobuf JSON deserialization.
func unmarshalJSON(dst []byte, src []byte) error {
if l := len(src); l >= 2 && src[0] == '"' && src[l-1] == '"' {
src = src[1 : l-1]
}
nLen := len(src)
if nLen == 0 {
return nil
}
if len(dst) != hex.DecodedLen(nLen) {
return errors.New("invalid length for ID")
}
_, err := hex.Decode(dst, src)
if err != nil {
return fmt.Errorf("cannot unmarshal ID from string '%s': %w", string(src), err)
}
return nil
}
func marshalBytes(dst []byte, src []byte) (n int, err error) {
if len(dst) < len(src) {
return 0, errors.New("buffer is too short")
}
return copy(dst, src), nil
}