2021-07-28 04:51:29 -04:00
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const { SplitTest } = require('../../models/SplitTest')
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const OError = require('@overleaf/o-error')
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const _ = require('lodash')
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const ALPHA_PHASE = 'alpha'
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const BETA_PHASE = 'beta'
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const RELEASE_PHASE = 'release'
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2022-01-28 05:44:10 -05:00
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async function getSplitTests({ name, activeOnly }) {
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const filters = {}
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if (name && name !== '') {
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filters.name = { $regex: _.escapeRegExp(name) }
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}
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if (activeOnly) {
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filters.$where = 'this.versions[this.versions.length - 1].active === true'
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}
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try {
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return await SplitTest.find(filters).limit(100).exec()
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} catch (error) {
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throw OError.tag(error, 'Failed to get split tests list')
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}
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}
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async function getSplitTestByName(name) {
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try {
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return await SplitTest.findOne({ name }).exec()
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} catch (error) {
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throw OError.tag(error, 'Failed to get split test', { name })
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}
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}
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2022-01-28 05:44:10 -05:00
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async function createSplitTest(name, configuration, info = {}) {
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const stripedVariants = []
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let stripeStart = 0
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_checkNewVariantsConfiguration([], configuration.variants)
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for (const variant of configuration.variants) {
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stripedVariants.push({
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name: variant.name,
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rolloutPercent: variant.rolloutPercent,
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rolloutStripes: [
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{
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start: stripeStart,
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end: stripeStart + variant.rolloutPercent,
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},
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],
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})
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stripeStart += variant.rolloutPercent
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}
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const splitTest = new SplitTest({
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name,
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2022-01-28 05:44:10 -05:00
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description: info.description,
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expectedEndDate: info.expectedEndDate,
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ticketUrl: info.ticketUrl,
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reportsUrls: info.reportsUrls,
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winningVariant: info.winningVariant,
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versions: [
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{
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versionNumber: 1,
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phase: configuration.phase,
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active: configuration.active,
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variants: stripedVariants,
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},
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],
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})
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return _saveSplitTest(splitTest)
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}
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2022-01-28 05:44:10 -05:00
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async function updateSplitTestConfig(name, configuration) {
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const splitTest = await getSplitTestByName(name)
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if (splitTest) {
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const lastVersion = splitTest.getCurrentVersion().toObject()
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if (configuration.phase !== lastVersion.phase) {
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throw new OError(
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`Cannot update with different phase - use switchToNextPhase endpoint instead`
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)
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}
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_checkNewVariantsConfiguration(lastVersion.variants, configuration.variants)
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const updatedVariants = _updateVariantsWithNewConfiguration(
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lastVersion.variants,
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configuration.variants
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)
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splitTest.versions.push({
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versionNumber: lastVersion.versionNumber + 1,
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phase: configuration.phase,
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active: configuration.active,
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variants: updatedVariants,
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})
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return _saveSplitTest(splitTest)
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} else {
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throw new OError(`Cannot update split test '${name}': not found`)
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}
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}
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async function updateSplitTestInfo(name, info) {
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const splitTest = await getSplitTestByName(name)
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if (splitTest) {
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splitTest.description = info.description
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splitTest.expectedEndDate = info.expectedEndDate
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splitTest.ticketUrl = info.ticketUrl
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splitTest.reportsUrls = info.reportsUrls
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splitTest.winningVariant = info.winningVariant
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return _saveSplitTest(splitTest)
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} else {
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throw new OError(`Cannot update split test '${name}': not found`)
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}
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}
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async function switchToNextPhase(name) {
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const splitTest = await getSplitTestByName(name)
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if (splitTest) {
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const lastVersionCopy = splitTest.getCurrentVersion().toObject()
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lastVersionCopy.versionNumber++
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if (lastVersionCopy.phase === ALPHA_PHASE) {
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lastVersionCopy.phase = BETA_PHASE
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} else if (lastVersionCopy.phase === BETA_PHASE) {
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if (splitTest.forbidReleasePhase) {
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throw new OError('Switch to release phase is disabled for this test')
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}
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lastVersionCopy.phase = RELEASE_PHASE
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} else if (splitTest.phase === RELEASE_PHASE) {
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throw new OError(
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`Split test with ID '${name}' is already in the release phase`
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)
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}
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for (const variant of lastVersionCopy.variants) {
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variant.rolloutPercent = 0
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variant.rolloutStripes = []
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}
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splitTest.versions.push(lastVersionCopy)
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return _saveSplitTest(splitTest)
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} else {
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throw new OError(
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`Cannot switch split test with ID '${name}' to next phase: not found`
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)
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}
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}
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async function revertToPreviousVersion(name, versionNumber) {
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const splitTest = await getSplitTestByName(name)
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if (splitTest) {
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if (splitTest.versions.length <= 1) {
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throw new OError(
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`Cannot revert split test with ID '${name}' to previous version: split test must have at least 2 versions`
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)
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}
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const previousVersion = splitTest.getVersion(versionNumber)
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if (!previousVersion) {
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throw new OError(
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`Cannot revert split test with ID '${name}' to version number ${versionNumber}: version not found`
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)
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}
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const lastVersion = splitTest.getCurrentVersion()
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if (
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lastVersion.phase === RELEASE_PHASE &&
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previousVersion.phase !== RELEASE_PHASE
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) {
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splitTest.forbidReleasePhase = true
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}
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const previousVersionCopy = previousVersion.toObject()
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previousVersionCopy.versionNumber = lastVersion.versionNumber + 1
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splitTest.versions.push(previousVersionCopy)
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return _saveSplitTest(splitTest)
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} else {
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throw new OError(
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`Cannot revert split test with ID '${name}' to previous version: not found`
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)
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}
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}
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function _checkNewVariantsConfiguration(variants, newVariantsConfiguration) {
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const totalRolloutPercentage = _getTotalRolloutPercentage(
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newVariantsConfiguration
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)
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if (totalRolloutPercentage > 100) {
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throw new OError(`Total variants rollout percentage cannot exceed 100`)
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}
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for (const variant of variants) {
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const newVariantConfiguration = _.find(newVariantsConfiguration, {
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name: variant.name,
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})
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if (!newVariantConfiguration) {
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throw new OError(
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`Variant defined in previous version as ${JSON.stringify(
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variant
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)} cannot be removed in new configuration: either set it inactive or create a new split test`
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)
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}
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if (newVariantConfiguration.rolloutPercent < variant.rolloutPercent) {
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throw new OError(
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`Rollout percentage for variant defined in previous version as ${JSON.stringify(
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variant
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)} cannot be decreased: revert to a previous configuration instead`
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)
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}
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}
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}
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function _updateVariantsWithNewConfiguration(
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variants,
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newVariantsConfiguration
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) {
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let totalRolloutPercentage = _getTotalRolloutPercentage(variants)
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const variantsCopy = _.clone(variants)
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for (const newVariantConfig of newVariantsConfiguration) {
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const variant = _.find(variantsCopy, { name: newVariantConfig.name })
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if (!variant) {
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variantsCopy.push({
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name: newVariantConfig.name,
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rolloutPercent: newVariantConfig.rolloutPercent,
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rolloutStripes: [
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{
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start: totalRolloutPercentage,
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end: totalRolloutPercentage + newVariantConfig.rolloutPercent,
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},
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],
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})
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totalRolloutPercentage += newVariantConfig.rolloutPercent
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} else if (variant.rolloutPercent < newVariantConfig.rolloutPercent) {
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const newStripeSize =
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newVariantConfig.rolloutPercent - variant.rolloutPercent
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variant.rolloutPercent = newVariantConfig.rolloutPercent
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variant.rolloutStripes.push({
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start: totalRolloutPercentage,
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end: totalRolloutPercentage + newStripeSize,
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})
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totalRolloutPercentage += newStripeSize
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}
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}
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return variantsCopy
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}
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function _getTotalRolloutPercentage(variants) {
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return _.sumBy(variants, 'rolloutPercent')
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}
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async function _saveSplitTest(splitTest) {
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try {
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return (await splitTest.save()).toObject()
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} catch (error) {
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throw OError.tag(error, 'Failed to save split test', {
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splitTest: JSON.stringify(splitTest),
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})
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}
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}
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module.exports = {
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getSplitTestByName,
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getSplitTests,
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createSplitTest,
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updateSplitTestConfig,
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updateSplitTestInfo,
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switchToNextPhase,
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revertToPreviousVersion,
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}
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