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<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue. Ex. Adding a feature - Explain what this achieves.--> ## Description - Add doc-tested examples for feature gate registration and flag parsing. - Demonstrate gate enable/disable flow without touching the global registry. <!-- Issue number if applicable --> ## Link to tracking issue Fixes #13144 <!--Describe what testing was performed and which tests were added.--> ## Testing ``` cd featuregate/ go test ./... -v ``` --------- Co-authored-by: Pablo Baeyens <[email protected]>
55 lines
1.4 KiB
Go
55 lines
1.4 KiB
Go
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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package featuregate_test
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import (
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"flag"
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"fmt"
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"go.opentelemetry.io/collector/featuregate"
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)
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func ExampleRegistry_Register() {
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reg := featuregate.NewRegistry()
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gate := reg.MustRegister(
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"featuregate.example.gate",
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featuregate.StageAlpha,
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featuregate.WithRegisterDescription("Example gate"),
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)
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// By default an alpha feature gate is disabled.
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fmt.Println(gate.IsEnabled())
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if err := reg.Set(gate.ID(), true); err != nil {
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fmt.Println("error:", err)
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return
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}
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// Alpha feature gates can be modified so the gate is now enabled.
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fmt.Println(gate.IsEnabled())
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// Output:
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// false
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// true
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}
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func ExampleRegistry_RegisterFlags() {
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reg := featuregate.NewRegistry()
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alphaGate := reg.MustRegister("featuregate.example.alpha", featuregate.StageAlpha)
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betaGate := reg.MustRegister("featuregate.example.beta", featuregate.StageBeta)
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fs := flag.NewFlagSet("example", flag.ContinueOnError)
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// RegisterFlags registers the `--feature-gates` flag on the FlagSet.
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reg.RegisterFlags(fs)
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if err := fs.Parse([]string{"--feature-gates=featuregate.example.alpha,-featuregate.example.beta"}); err != nil {
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fmt.Println("error:", err)
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return
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}
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fmt.Printf("featuregate.example.alpha=%v\n", alphaGate.IsEnabled())
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fmt.Printf("featuregate.example.beta=%v\n", betaGate.IsEnabled())
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// Output:
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// featuregate.example.alpha=true
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// featuregate.example.beta=false
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}
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