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a90b7300be
Instead of tagging events with their type, instead we infer the type from the label pattern. The standard event creators all have a matching test that returns true if the the labels pattern matches the ones that would be built by the creator. Spans and logs already have a unique label pattern, other event types required a special label marker. This makes the system much more extensible, and also cleans up some the API. Change-Id: I1fbc9ec07aa84ead6c12bbd5ca65b13b605bfa4a Reviewed-on: https://go-review.googlesource.com/c/tools/+/229242 Run-TryBot: Ian Cottrell <iancottrell@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
86 lines
2.1 KiB
Go
86 lines
2.1 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 core provides support for event based telemetry.
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package core
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import (
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"fmt"
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"time"
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"golang.org/x/tools/internal/event/label"
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)
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// Event holds the information about an event of note that ocurred.
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type Event struct {
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at time.Time
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// As events are often on the stack, storing the first few labels directly
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// in the event can avoid an allocation at all for the very common cases of
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// simple events.
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// The length needs to be large enough to cope with the majority of events
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// but no so large as to cause undue stack pressure.
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// A log message with two values will use 3 labels (one for each value and
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// one for the message itself).
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static [3]label.Label // inline storage for the first few labels
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dynamic []label.Label // dynamically sized storage for remaining labels
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}
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// eventLabelMap implements label.Map for a the labels of an Event.
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type eventLabelMap struct {
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event Event
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}
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func (ev Event) At() time.Time { return ev.at }
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func (ev Event) Format(f fmt.State, r rune) {
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if !ev.at.IsZero() {
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fmt.Fprint(f, ev.at.Format("2006/01/02 15:04:05 "))
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}
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for index := 0; ev.Valid(index); index++ {
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if l := ev.Label(index); l.Valid() {
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fmt.Fprintf(f, "\n\t%v", l)
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}
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}
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}
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func (ev Event) Valid(index int) bool {
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return index >= 0 && index < len(ev.static)+len(ev.dynamic)
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}
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func (ev Event) Label(index int) label.Label {
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if index < len(ev.static) {
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return ev.static[index]
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}
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return ev.dynamic[index-len(ev.static)]
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}
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func (ev Event) Find(key label.Key) label.Label {
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for _, l := range ev.static {
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if l.Key() == key {
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return l
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}
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}
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for _, l := range ev.dynamic {
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if l.Key() == key {
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return l
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}
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}
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return label.Label{}
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}
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func MakeEvent(static [3]label.Label, labels []label.Label) Event {
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return Event{
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static: static,
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dynamic: labels,
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}
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}
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// CloneEvent event returns a copy of the event with the time adjusted to at.
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func CloneEvent(ev Event, at time.Time) Event {
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ev.at = at
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return ev
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}
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