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https://github.com/golang/go
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eff45d17df
This makes keys a pointer, which reduces the allocations during logging, and has a significant improvement in memory and cpu cost when there is no exporter. Packing a string into an interface requires a 16 byte allocation, packing a pointer does not. name old time/op new time/op delta /LogNoExporter-8 4.39µs ± 2% 3.83µs ± 2% -12.74% (p=0.000 n=18+20) /Log-8 23.5µs ± 2% 22.6µs ± 1% -4.20% (p=0.000 n=19+18) name old alloc/op new alloc/op delta /LogNoExporter-8 1.70kB ± 0% 1.38kB ± 0% -18.78% (p=0.000 n=20+20) /Log-8 4.91kB ± 0% 4.91kB ± 0% ~ (p=1.000 n=20+20) name old allocs/op new allocs/op delta /LogNoExporter-8 83.0 ± 0% 63.0 ± 0% -24.10% (p=0.000 n=20+20) /Log-8 163 ± 0% 163 ± 0% ~ (all equal) Change-Id: Iec127f1bff8d5c8f4bd0a6d9f6d8fc4b8bc740b2 Reviewed-on: https://go-review.googlesource.com/c/tools/+/222599 Run-TryBot: Ian Cottrell <iancottrell@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
53 lines
1.2 KiB
Go
53 lines
1.2 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package event provides support for event based telemetry.
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package event
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import (
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"fmt"
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"time"
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)
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type eventType uint8
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const (
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LogType = eventType(iota)
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StartSpanType
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EndSpanType
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LabelType
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DetachType
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)
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type Event struct {
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Type eventType
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At time.Time
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Message string
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Error error
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Tags TagList
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}
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func (e Event) IsLog() bool { return e.Type == LogType }
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func (e Event) IsEndSpan() bool { return e.Type == EndSpanType }
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func (e Event) IsStartSpan() bool { return e.Type == StartSpanType }
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func (e Event) IsTag() bool { return e.Type == LabelType }
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func (e Event) IsDetach() bool { return e.Type == DetachType }
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func (e Event) Format(f fmt.State, r rune) {
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if !e.At.IsZero() {
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fmt.Fprint(f, e.At.Format("2006/01/02 15:04:05 "))
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}
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fmt.Fprint(f, e.Message)
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if e.Error != nil {
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if f.Flag('+') {
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fmt.Fprintf(f, ": %+v", e.Error)
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} else {
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fmt.Fprintf(f, ": %v", e.Error)
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}
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}
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for _, tag := range e.Tags {
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fmt.Fprintf(f, "\n\t%s = %v", tag.Key.Name, tag.Value)
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}
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}
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