47 lines
1.7 KiB
Swift
47 lines
1.7 KiB
Swift
//
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// Copyright 2023 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import Foundation
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/// Object enabling a phased rollout of features depending on the `userId` and `targetPercentage`.
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///
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/// The feature uses an experiment under the hood with 100 variants representing 100%.
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/// Each userId is deterministically and uniformly assigned a variant, and depending
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/// on whether this falls below or above the `targetPercentage` threshold, the feature
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/// is considered enabled or disabled.
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struct PhasedRolloutFeature {
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private let experiment: Experiment
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private let targetPercentage: Double
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init(name: String, targetPercentage: Double) {
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self.experiment = .init(
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name: name,
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// 100 variants where each variant represents a single percentage
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variants: 100
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)
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self.targetPercentage = targetPercentage
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}
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func isEnabled(userId: String) -> Bool {
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// Get a bucket number between 0-99
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let variant = experiment.variant(userId: userId)
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// Convert to a percentage
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let percentage = Double(variant) / 100
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// Consider enabled if falls below rollout target
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return percentage < targetPercentage
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}
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}
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