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opentelemetry-go/attribute/value.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 attribute // import "go.opentelemetry.io/otel/attribute"
import (
"encoding/json"
"fmt"
"strconv"
"go.opentelemetry.io/otel/internal"
)
//go:generate stringer -type=Type
// Type describes the type of the data Value holds.
type Type int // nolint: revive // redefines builtin Type.
// Value represents the value part in key-value pairs.
type Value struct {
vtype Type
numeric uint64
stringly string
slice interface{}
}
const (
// INVALID is used for a Value with no value set.
INVALID Type = iota
// BOOL is a boolean Type Value.
BOOL
// INT64 is a 64-bit signed integral Type Value.
INT64
// FLOAT64 is a 64-bit floating point Type Value.
FLOAT64
// STRING is a string Type Value.
STRING
// BOOLSLICE is a slice of booleans Type Value.
BOOLSLICE
// INT64SLICE is a slice of 64-bit signed integral numbers Type Value.
INT64SLICE
// FLOAT64SLICE is a slice of 64-bit floating point numbers Type Value.
FLOAT64SLICE
// STRINGSLICE is a slice of strings Type Value.
STRINGSLICE
)
// BoolValue creates a BOOL Value.
func BoolValue(v bool) Value {
return Value{
vtype: BOOL,
numeric: internal.BoolToRaw(v),
}
}
// BoolSliceValue creates a BOOLSLICE Value.
func BoolSliceValue(v []bool) Value {
cp := make([]bool, len(v))
copy(cp, v)
return Value{
vtype: BOOLSLICE,
slice: &cp,
}
}
// IntValue creates an INT64 Value.
func IntValue(v int) Value {
return Int64Value(int64(v))
}
// IntSliceValue creates an INTSLICE Value.
func IntSliceValue(v []int) Value {
cp := make([]int64, 0, len(v))
for _, i := range v {
cp = append(cp, int64(i))
}
return Value{
vtype: INT64SLICE,
slice: &cp,
}
}
// Int64Value creates an INT64 Value.
func Int64Value(v int64) Value {
return Value{
vtype: INT64,
numeric: internal.Int64ToRaw(v),
}
}
// Int64SliceValue creates an INT64SLICE Value.
func Int64SliceValue(v []int64) Value {
cp := make([]int64, len(v))
copy(cp, v)
return Value{
vtype: INT64SLICE,
slice: &cp,
}
}
// Float64Value creates a FLOAT64 Value.
func Float64Value(v float64) Value {
return Value{
vtype: FLOAT64,
numeric: internal.Float64ToRaw(v),
}
}
// Float64SliceValue creates a FLOAT64SLICE Value.
func Float64SliceValue(v []float64) Value {
cp := make([]float64, len(v))
copy(cp, v)
return Value{
vtype: FLOAT64SLICE,
slice: &cp,
}
}
// StringValue creates a STRING Value.
func StringValue(v string) Value {
return Value{
vtype: STRING,
stringly: v,
}
}
// StringSliceValue creates a STRINGSLICE Value.
func StringSliceValue(v []string) Value {
cp := make([]string, len(v))
copy(cp, v)
return Value{
vtype: STRINGSLICE,
slice: &cp,
}
}
// Type returns a type of the Value.
func (v Value) Type() Type {
return v.vtype
}
// AsBool returns the bool value. Make sure that the Value's type is
// BOOL.
func (v Value) AsBool() bool {
return internal.RawToBool(v.numeric)
}
// AsBoolSlice returns the []bool value. Make sure that the Value's type is
// BOOLSLICE.
func (v Value) AsBoolSlice() []bool {
if s, ok := v.slice.(*[]bool); ok {
return *s
}
return nil
}
// AsInt64 returns the int64 value. Make sure that the Value's type is
// INT64.
func (v Value) AsInt64() int64 {
return internal.RawToInt64(v.numeric)
}
// AsInt64Slice returns the []int64 value. Make sure that the Value's type is
// INT64SLICE.
func (v Value) AsInt64Slice() []int64 {
if s, ok := v.slice.(*[]int64); ok {
return *s
}
return nil
}
// AsFloat64 returns the float64 value. Make sure that the Value's
// type is FLOAT64.
func (v Value) AsFloat64() float64 {
return internal.RawToFloat64(v.numeric)
}
// AsFloat64Slice returns the []float64 value. Make sure that the Value's type is
// FLOAT64SLICE.
func (v Value) AsFloat64Slice() []float64 {
if s, ok := v.slice.(*[]float64); ok {
return *s
}
return nil
}
// AsString returns the string value. Make sure that the Value's type
// is STRING.
func (v Value) AsString() string {
return v.stringly
}
// AsStringSlice returns the []string value. Make sure that the Value's type is
// STRINGSLICE.
func (v Value) AsStringSlice() []string {
if s, ok := v.slice.(*[]string); ok {
return *s
}
return nil
}
type unknownValueType struct{}
// AsInterface returns Value's data as interface{}.
func (v Value) AsInterface() interface{} {
switch v.Type() {
case BOOL:
return v.AsBool()
case BOOLSLICE:
return v.AsBoolSlice()
case INT64:
return v.AsInt64()
case INT64SLICE:
return v.AsInt64Slice()
case FLOAT64:
return v.AsFloat64()
case FLOAT64SLICE:
return v.AsFloat64Slice()
case STRING:
return v.stringly
case STRINGSLICE:
return v.AsStringSlice()
}
return unknownValueType{}
}
// Emit returns a string representation of Value's data.
func (v Value) Emit() string {
switch v.Type() {
case BOOLSLICE:
return fmt.Sprint(*(v.slice.(*[]bool)))
case BOOL:
return strconv.FormatBool(v.AsBool())
case INT64SLICE:
return fmt.Sprint(*(v.slice.(*[]int64)))
case INT64:
return strconv.FormatInt(v.AsInt64(), 10)
case FLOAT64SLICE:
return fmt.Sprint(*(v.slice.(*[]float64)))
case FLOAT64:
return fmt.Sprint(v.AsFloat64())
case STRINGSLICE:
return fmt.Sprint(*(v.slice.(*[]string)))
case STRING:
return v.stringly
default:
return "unknown"
}
}
// MarshalJSON returns the JSON encoding of the Value.
func (v Value) MarshalJSON() ([]byte, error) {
var jsonVal struct {
Type string
Value interface{}
}
jsonVal.Type = v.Type().String()
jsonVal.Value = v.AsInterface()
return json.Marshal(jsonVal)
}