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kv.go
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kv.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"
"reflect"
)
// KeyValue holds a key and value pair.
type KeyValue struct {
Key Key
Value Value
}
// Valid returns if kv is a valid OpenTelemetry attribute.
func (kv KeyValue) Valid() bool {
return kv.Key != "" && kv.Value.Type() != INVALID
}
// Bool creates a KeyValue with a BOOL Value type.
func Bool(k string, v bool) KeyValue {
return Key(k).Bool(v)
}
// BoolSlice creates a KeyValue with a BOOLSLICE Value type.
func BoolSlice(k string, v []bool) KeyValue {
return Key(k).BoolSlice(v)
}
// Int creates a KeyValue with an INT64 Value type.
func Int(k string, v int) KeyValue {
return Key(k).Int(v)
}
// IntSlice creates a KeyValue with an INT64SLICE Value type.
func IntSlice(k string, v []int) KeyValue {
return Key(k).IntSlice(v)
}
// Int64 creates a KeyValue with an INT64 Value type.
func Int64(k string, v int64) KeyValue {
return Key(k).Int64(v)
}
// Int64Slice creates a KeyValue with an INT64SLICE Value type.
func Int64Slice(k string, v []int64) KeyValue {
return Key(k).Int64Slice(v)
}
// Float64 creates a KeyValue with a FLOAT64 Value type.
func Float64(k string, v float64) KeyValue {
return Key(k).Float64(v)
}
// Float64Slice creates a KeyValue with a FLOAT64SLICE Value type.
func Float64Slice(k string, v []float64) KeyValue {
return Key(k).Float64Slice(v)
}
// String creates a KeyValue with a STRING Value type.
func String(k, v string) KeyValue {
return Key(k).String(v)
}
// StringSlice creates a KeyValue with a STRINGSLICE Value type.
func StringSlice(k string, v []string) KeyValue {
return Key(k).StringSlice(v)
}
// Stringer creates a new key-value pair with a passed name and a string
// value generated by the passed Stringer interface.
func Stringer(k string, v fmt.Stringer) KeyValue {
return Key(k).String(v.String())
}
// Array creates a new key-value pair with a passed name and a array.
// Only arrays of primitive type are supported.
//
// Deprecated: Use the typed *Slice functions instead.
func Array(k string, v interface{}) KeyValue {
return Key(k).Array(v)
}
// Any creates a new key-value pair instance with a passed name and
// automatic type inference. This is slower, and not type-safe.
//
// Deprecated: Use the typed functions instead.
func Any(k string, value interface{}) KeyValue {
if value == nil {
return String(k, "<nil>")
}
if stringer, ok := value.(fmt.Stringer); ok {
return String(k, stringer.String())
}
rv := reflect.ValueOf(value)
switch rv.Kind() {
case reflect.Array:
rv = rv.Slice(0, rv.Len())
fallthrough
case reflect.Slice:
switch reflect.TypeOf(value).Elem().Kind() {
case reflect.Bool:
return BoolSlice(k, rv.Interface().([]bool))
case reflect.Int:
return IntSlice(k, rv.Interface().([]int))
case reflect.Int64:
return Int64Slice(k, rv.Interface().([]int64))
case reflect.Float64:
return Float64Slice(k, rv.Interface().([]float64))
case reflect.String:
return StringSlice(k, rv.Interface().([]string))
default:
return KeyValue{Key: Key(k), Value: Value{vtype: INVALID}}
}
case reflect.Bool:
return Bool(k, rv.Bool())
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return Int64(k, rv.Int())
case reflect.Float64:
return Float64(k, rv.Float())
case reflect.String:
return String(k, rv.String())
}
if b, err := json.Marshal(value); b != nil && err == nil {
return String(k, string(b))
}
return String(k, fmt.Sprint(value))
}