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43 lines
1.4 KiB
Kotlin
43 lines
1.4 KiB
Kotlin
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.fenix.ext
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import mozilla.components.service.nimbus.NimbusApi
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import mozilla.components.support.base.log.logger.Logger
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import org.mozilla.fenix.FeatureFlags
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/**
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* Gets the branch of the given `experimentId` and transforms it with given closure.
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*
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* If we're enrolled in the experiment, the transform is passed the branch id/slug as a `String`.
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*
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* If we're not enrolled in the experiment, or the experiment is not valid then the transform
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* is passed a `null`.
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*/
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@Suppress("TooGenericExceptionCaught")
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fun <T> NimbusApi.withExperiment(experimentId: String, transform: (String?) -> T): T {
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val branch = if (FeatureFlags.nimbusExperiments) {
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try {
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getExperimentBranch(experimentId)
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} catch (e: Throwable) {
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Logger.error("Failed to getExperimentBranch($experimentId)", e)
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null
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}
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} else {
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null
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}
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return transform(branch)
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}
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/**
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* The degenerate case of `withExperiment(String, (String?) -> T))`, with an identity transform.
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*
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* Short-hand for `mozilla.components.service.nimbus.NimbusApi.getExperimentBranch`.
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*/
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fun NimbusApi.withExperiment(experimentId: String) =
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this.withExperiment(experimentId, ::identity)
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private fun <T> identity(value: T) = value
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