mirror of
https://github.com/golang/go
synced 2024-11-06 04:26:11 -07:00
32f14692fc
This means that tags also become cheap if there is no exporter and cleans up the mess with how spans, tags and logs were related. Also fixes the currently broken metrics that relied on the span tags. Change-Id: I8e56b6218a60fd31a1f6c8d329dbb2cab1b9254d Reviewed-on: https://go-review.googlesource.com/c/tools/+/222065 Run-TryBot: Ian Cottrell <iancottrell@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
60 lines
1.4 KiB
Go
60 lines
1.4 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
// Package export holds the definition of the telemetry Exporter interface,
|
|
// along with some simple implementations.
|
|
// Larger more complex exporters are in sub packages of their own.
|
|
package export
|
|
|
|
import (
|
|
"context"
|
|
"os"
|
|
"sync/atomic"
|
|
"unsafe"
|
|
|
|
"golang.org/x/tools/internal/telemetry"
|
|
)
|
|
|
|
type Exporter interface {
|
|
// ProcessEvent is a function that handles all events.
|
|
// Exporters may use information in the context to decide what to do with a
|
|
// given event.
|
|
ProcessEvent(context.Context, telemetry.Event) context.Context
|
|
|
|
Metric(context.Context, telemetry.MetricData)
|
|
}
|
|
|
|
var (
|
|
exporter unsafe.Pointer
|
|
)
|
|
|
|
func init() {
|
|
SetExporter(LogWriter(os.Stderr, true))
|
|
}
|
|
|
|
func SetExporter(e Exporter) {
|
|
p := unsafe.Pointer(&e)
|
|
if e == nil {
|
|
p = nil
|
|
}
|
|
atomic.StorePointer(&exporter, p)
|
|
}
|
|
|
|
func ProcessEvent(ctx context.Context, event telemetry.Event) context.Context {
|
|
exporterPtr := (*Exporter)(atomic.LoadPointer(&exporter))
|
|
if exporterPtr == nil {
|
|
return ctx
|
|
}
|
|
// and now also hand the event of to the current exporter
|
|
return (*exporterPtr).ProcessEvent(ctx, event)
|
|
}
|
|
|
|
func Metric(ctx context.Context, data telemetry.MetricData) {
|
|
exporterPtr := (*Exporter)(atomic.LoadPointer(&exporter))
|
|
if exporterPtr == nil {
|
|
return
|
|
}
|
|
(*exporterPtr).Metric(ctx, data)
|
|
}
|