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cd86c99144
Using a goto based loop makes it become a leaf function which can be inlined, making us get a slight performance increase in the fast path. See: https://github.com/golang/go/issues/14768
71 lines
1.2 KiB
Go
71 lines
1.2 KiB
Go
// Copyright 2012-2017 Apcera Inc. All rights reserved.
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package server
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import (
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"time"
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"github.com/nats-io/nuid"
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)
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// Use nuid.
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func genID() string {
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return nuid.Next()
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}
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// Ascii numbers 0-9
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const (
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asciiZero = 48
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asciiNine = 57
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)
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// parseSize expects decimal positive numbers. We
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// return -1 to signal error.
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func parseSize(d []byte) (n int) {
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l := len(d)
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if l == 0 {
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return -1
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}
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var (
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i int
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dec byte
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)
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// Note: Use `goto` here to avoid for loop in order
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// to have the function be inlined.
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// See: https://github.com/golang/go/issues/14768
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loop:
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dec = d[i]
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if dec < asciiZero || dec > asciiNine {
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return -1
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}
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n = n*10 + (int(dec) - asciiZero)
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i++
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if i < l {
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goto loop
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}
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return n
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}
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// parseInt64 expects decimal positive numbers. We
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// return -1 to signal error
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func parseInt64(d []byte) (n int64) {
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if len(d) == 0 {
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return -1
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}
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for _, dec := range d {
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if dec < asciiZero || dec > asciiNine {
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return -1
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}
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n = n*10 + (int64(dec) - asciiZero)
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}
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return n
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}
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// Helper to move from float seconds to time.Duration
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func secondsToDuration(seconds float64) time.Duration {
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ttl := seconds * float64(time.Second)
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return time.Duration(ttl)
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}
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