mirror of https://github.com/prometheus/prometheus
39 lines
1.1 KiB
Go
39 lines
1.1 KiB
Go
package models // import "github.com/influxdata/influxdb/models"
|
|
|
|
import (
|
|
"reflect"
|
|
"strconv"
|
|
"unsafe"
|
|
)
|
|
|
|
// parseIntBytes is a zero-alloc wrapper around strconv.ParseInt.
|
|
func parseIntBytes(b []byte, base int, bitSize int) (i int64, err error) {
|
|
s := unsafeBytesToString(b)
|
|
return strconv.ParseInt(s, base, bitSize)
|
|
}
|
|
|
|
// parseFloatBytes is a zero-alloc wrapper around strconv.ParseFloat.
|
|
func parseFloatBytes(b []byte, bitSize int) (float64, error) {
|
|
s := unsafeBytesToString(b)
|
|
return strconv.ParseFloat(s, bitSize)
|
|
}
|
|
|
|
// parseBoolBytes is a zero-alloc wrapper around strconv.ParseBool.
|
|
func parseBoolBytes(b []byte) (bool, error) {
|
|
return strconv.ParseBool(unsafeBytesToString(b))
|
|
}
|
|
|
|
// unsafeBytesToString converts a []byte to a string without a heap allocation.
|
|
//
|
|
// It is unsafe, and is intended to prepare input to short-lived functions
|
|
// that require strings.
|
|
func unsafeBytesToString(in []byte) string {
|
|
src := *(*reflect.SliceHeader)(unsafe.Pointer(&in))
|
|
dst := reflect.StringHeader{
|
|
Data: src.Data,
|
|
Len: src.Len,
|
|
}
|
|
s := *(*string)(unsafe.Pointer(&dst))
|
|
return s
|
|
}
|