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9f82e51c89
Good day,
This PR changes As[Bool|Int64|Float64|String]Slice to use a little less
reflection.
The benchstat result of this is as follows.
```
goos: linux
goarch: amd64
pkg: go.opentelemetry.io/otel/internal/attribute
cpu: AMD Ryzen 7 Pro 7735U with Radeon Graphics
│ org.txt │ new.txt │
│ sec/op │ sec/op vs base │
AsFloat64Slice-16 373.3n ± 41% 181.0n ± 42% -51.51% (p=0.000 n=10)
│ org.txt │ new.txt │
│ B/op │ B/op vs base │
AsFloat64Slice-16 64.00 ± 0% 40.00 ± 0% -37.50% (p=0.000 n=10)
│ org.txt │ new.txt │
│ allocs/op │ allocs/op vs base │
AsFloat64Slice-16 3.000 ± 0% 2.000 ± 0% -33.33% (p=0.000 n=10)
```
---------
Co-authored-by: Damien Mathieu <42@dmathieu.com>
97 lines
2.7 KiB
Go
97 lines
2.7 KiB
Go
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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/*
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Package attribute provide several helper functions for some commonly used
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logic of processing attributes.
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*/
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package attribute // import "go.opentelemetry.io/otel/internal/attribute"
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import (
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"reflect"
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)
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// BoolSliceValue converts a bool slice into an array with same elements as slice.
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func BoolSliceValue(v []bool) interface{} {
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var zero bool
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cp := reflect.New(reflect.ArrayOf(len(v), reflect.TypeOf(zero))).Elem()
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reflect.Copy(cp, reflect.ValueOf(v))
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return cp.Interface()
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}
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// Int64SliceValue converts an int64 slice into an array with same elements as slice.
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func Int64SliceValue(v []int64) interface{} {
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var zero int64
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cp := reflect.New(reflect.ArrayOf(len(v), reflect.TypeOf(zero))).Elem()
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reflect.Copy(cp, reflect.ValueOf(v))
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return cp.Interface()
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}
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// Float64SliceValue converts a float64 slice into an array with same elements as slice.
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func Float64SliceValue(v []float64) interface{} {
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var zero float64
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cp := reflect.New(reflect.ArrayOf(len(v), reflect.TypeOf(zero))).Elem()
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reflect.Copy(cp, reflect.ValueOf(v))
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return cp.Interface()
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}
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// StringSliceValue converts a string slice into an array with same elements as slice.
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func StringSliceValue(v []string) interface{} {
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var zero string
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cp := reflect.New(reflect.ArrayOf(len(v), reflect.TypeOf(zero))).Elem()
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reflect.Copy(cp, reflect.ValueOf(v))
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return cp.Interface()
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}
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// AsBoolSlice converts a bool array into a slice into with same elements as array.
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func AsBoolSlice(v interface{}) []bool {
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rv := reflect.ValueOf(v)
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if rv.Type().Kind() != reflect.Array {
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return nil
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}
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cpy := make([]bool, rv.Len())
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if len(cpy) > 0 {
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_ = reflect.Copy(reflect.ValueOf(cpy), rv)
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}
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return cpy
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}
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// AsInt64Slice converts an int64 array into a slice into with same elements as array.
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func AsInt64Slice(v interface{}) []int64 {
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rv := reflect.ValueOf(v)
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if rv.Type().Kind() != reflect.Array {
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return nil
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}
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cpy := make([]int64, rv.Len())
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if len(cpy) > 0 {
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_ = reflect.Copy(reflect.ValueOf(cpy), rv)
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}
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return cpy
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}
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// AsFloat64Slice converts a float64 array into a slice into with same elements as array.
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func AsFloat64Slice(v interface{}) []float64 {
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rv := reflect.ValueOf(v)
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if rv.Type().Kind() != reflect.Array {
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return nil
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}
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cpy := make([]float64, rv.Len())
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if len(cpy) > 0 {
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_ = reflect.Copy(reflect.ValueOf(cpy), rv)
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}
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return cpy
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}
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// AsStringSlice converts a string array into a slice into with same elements as array.
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func AsStringSlice(v interface{}) []string {
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rv := reflect.ValueOf(v)
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if rv.Type().Kind() != reflect.Array {
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return nil
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}
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cpy := make([]string, rv.Len())
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if len(cpy) > 0 {
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_ = reflect.Copy(reflect.ValueOf(cpy), rv)
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}
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return cpy
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}
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