ae9f97221a
* go-metrics: fork library and introduce ResettingTimer and InfluxDB reporter. * vendor: change nonsense/go-metrics to ethersphere/go-metrics * go-metrics: add tests. move ResettingTimer logic from reporter to type. * all, metrics: pull in metrics package in go-ethereum * metrics/test: make sure metrics are enabled for tests * metrics: apply gosimple rules * metrics/exp, internal/debug: init expvar endpoint when starting pprof server * internal/debug: tiny comment formatting fix
45 lines
1.3 KiB
Go
45 lines
1.3 KiB
Go
package models // import "github.com/influxdata/influxdb/models"
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import (
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"reflect"
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"strconv"
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"unsafe"
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)
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// parseIntBytes is a zero-alloc wrapper around strconv.ParseInt.
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func parseIntBytes(b []byte, base int, bitSize int) (i int64, err error) {
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s := unsafeBytesToString(b)
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return strconv.ParseInt(s, base, bitSize)
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}
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// parseUintBytes is a zero-alloc wrapper around strconv.ParseUint.
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func parseUintBytes(b []byte, base int, bitSize int) (i uint64, err error) {
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s := unsafeBytesToString(b)
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return strconv.ParseUint(s, base, bitSize)
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}
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// parseFloatBytes is a zero-alloc wrapper around strconv.ParseFloat.
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func parseFloatBytes(b []byte, bitSize int) (float64, error) {
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s := unsafeBytesToString(b)
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return strconv.ParseFloat(s, bitSize)
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}
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// parseBoolBytes is a zero-alloc wrapper around strconv.ParseBool.
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func parseBoolBytes(b []byte) (bool, error) {
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return strconv.ParseBool(unsafeBytesToString(b))
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}
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// unsafeBytesToString converts a []byte to a string without a heap allocation.
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//
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// It is unsafe, and is intended to prepare input to short-lived functions
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// that require strings.
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func unsafeBytesToString(in []byte) string {
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src := *(*reflect.SliceHeader)(unsafe.Pointer(&in))
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dst := reflect.StringHeader{
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Data: src.Data,
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Len: src.Len,
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}
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s := *(*string)(unsafe.Pointer(&dst))
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return s
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}
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