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a part of #7020 ```txt goos: windows goarch: amd64 pkg: go.opentelemetry.io/otel/exporters/stdout/stdoutlog/internal/observ cpu: Intel(R) Core(TM) i7-14700 │ result.txt │ │ sec/op │ InstrumentationExportLogs/NoError-28 47.68n ± 5% InstrumentationExportLogs/PartialError-28 471.6n ± 2% InstrumentationExportLogs/FullError-28 471.9n ± 10% geomean 219.7n │ result.txt │ │ B/op │ InstrumentationExportLogs/NoError-28 0.000 ± 0% InstrumentationExportLogs/PartialError-28 305.0 ± 0% InstrumentationExportLogs/FullError-28 305.0 ± 0% geomean ¹ ¹ summaries must be >0 to compute geomean │ result.txt │ │ allocs/op │ InstrumentationExportLogs/NoError-28 0.000 ± 0% InstrumentationExportLogs/PartialError-28 4.000 ± 0% InstrumentationExportLogs/FullError-28 4.000 ± 0% geomean ¹ ¹ summaries must be >0 to compute geomean ``` --------- Co-authored-by: Damien Mathieu <42@dmathieu.com>
59 lines
1.8 KiB
Go
59 lines
1.8 KiB
Go
// Code generated by gotmpl. DO NOT MODIFY.
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// source: internal/shared/x/x.go.tmpl
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// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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// Package x documents experimental features for [go.opentelemetry.io/otel/exporters/stdout/stdoutlog].
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package x // import "go.opentelemetry.io/otel/exporters/stdout/stdoutlog/internal/x"
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import (
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"os"
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)
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// Feature is an experimental feature control flag. It provides a uniform way
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// to interact with these feature flags and parse their values.
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type Feature[T any] struct {
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keys []string
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parse func(v string) (T, bool)
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}
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func newFeature[T any](suffix []string, parse func(string) (T, bool)) Feature[T] {
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const envKeyRoot = "OTEL_GO_X_"
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keys := make([]string, 0, len(suffix))
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for _, s := range suffix {
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keys = append(keys, envKeyRoot+s)
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}
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return Feature[T]{
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keys: keys,
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parse: parse,
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}
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}
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// Keys returns the environment variable keys that can be set to enable the
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// feature.
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func (f Feature[T]) Keys() []string { return f.keys }
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// Lookup returns the user configured value for the feature and true if the
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// user has enabled the feature. Otherwise, if the feature is not enabled, a
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// zero-value and false are returned.
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func (f Feature[T]) Lookup() (v T, ok bool) {
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// https://github.com/open-telemetry/opentelemetry-specification/blob/62effed618589a0bec416a87e559c0a9d96289bb/specification/configuration/sdk-environment-variables.md#parsing-empty-value
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//
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// > The SDK MUST interpret an empty value of an environment variable the
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// > same way as when the variable is unset.
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for _, key := range f.keys {
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vRaw := os.Getenv(key)
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if vRaw != "" {
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return f.parse(vRaw)
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}
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}
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return v, ok
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}
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// Enabled reports whether the feature is enabled.
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func (f Feature[T]) Enabled() bool {
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_, ok := f.Lookup()
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return ok
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}
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