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https://github.com/golang/go
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c81623a0cb
Also moves core.Key to label.Key, but leaves the implementations behind for now. After using for a while, the word Tag conveys slightly the wrong concept, tagging implies the entire set of information, label maps better to a single named piece of information. A label is just a named key/value pair, it is not really tied to the event package, separating it makes it much easier to understand the public symbols of the event and core packages, and allows us to also move the key implementations somewhere else, which otherwise dominate the API. Change-Id: I46275d531cec91e28af6ab1e74a2713505d52533 Reviewed-on: https://go-review.googlesource.com/c/tools/+/229239 Run-TryBot: Ian Cottrell <iancottrell@google.com> Reviewed-by: Robert Findley <rfindley@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
58 lines
1.4 KiB
Go
58 lines
1.4 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 metric aggregates events into metrics that can be exported.
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package metric
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import (
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"context"
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"sync"
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"time"
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"golang.org/x/tools/internal/event"
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"golang.org/x/tools/internal/event/core"
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"golang.org/x/tools/internal/event/label"
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)
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var Entries = core.NewKey("metric_entries", "The set of metrics calculated for an event")
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type Config struct {
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subscribers map[interface{}][]subscriber
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}
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type subscriber func(time.Time, label.Map, label.Label) Data
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func (e *Config) subscribe(key label.Key, s subscriber) {
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if e.subscribers == nil {
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e.subscribers = make(map[interface{}][]subscriber)
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}
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e.subscribers[key] = append(e.subscribers[key], s)
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}
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func (e *Config) Exporter(output event.Exporter) event.Exporter {
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var mu sync.Mutex
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return func(ctx context.Context, ev core.Event, lm label.Map) context.Context {
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if !ev.IsRecord() {
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return output(ctx, ev, lm)
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}
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mu.Lock()
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defer mu.Unlock()
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var metrics []Data
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for index := 0; ev.Valid(index); index++ {
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l := ev.Label(index)
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if !l.Valid() {
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continue
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}
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id := l.Key()
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if list := e.subscribers[id]; len(list) > 0 {
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for _, s := range list {
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metrics = append(metrics, s(ev.At, lm, l))
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}
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}
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}
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lm = label.MergeMaps(label.NewMap(Entries.Of(metrics)), lm)
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return output(ctx, ev, lm)
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}
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}
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