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import {logger} from './logger'
export const RULE_TYPE_STRING = 'string'
export const RULE_TYPE_INT = 'int'
export const RULE_TYPE_FLOAT = 'float'
export const RULE_TYPE_BOOLEAN = 'boolean'
export const RULE_TYPE_DATE = 'date'
export const RULE_TYPE_DATETIME = 'datetime'
export const RULE_OPERATOR_IS = 'is'
export const RULE_OPERATOR_IS_NOT = 'is_not'
export const RULE_OPERATOR_IN = 'in'
export const RULE_OPERATOR_NOT_IN = 'not_in'
export const RULE_OPERATOR_LT = 'lt'
export const RULE_OPERATOR_LTE = 'lte'
export const RULE_OPERATOR_GT = 'gt'
export const RULE_OPERATOR_GTE = 'gte'
export const RULE_OPERATOR_FROM = 'from'
export const RULE_OPERATOR_UNTIL = 'until'
export const RULE_OPERATOR_AFTER = 'after'
export const RULE_OPERATOR_BEFORE = 'before'
export const getHashedValue = s => {
return (parseInt(md5(s), 16) * 1.0) / 340282366920938463463374607431768211455
}
export default class Population {
constructor(population) {
this.population = population
}
static categorizeValueType(v) {
Iif (v === true || v === false) {
return 'boolean'
} else if (typeof v === 'number') {
Iif ((v + '').indexOf('.') >= 0) {
return 'float'
} else {
return 'int'
}
} else Eif (typeof v === 'string') {
const unixTimestamp = new Date(v).getTime()
if (!isNaN(unixTimestamp)) {
const isoFormat = new Date(v).toISOString()
const timeIndex = isoFormat.lastIndexOf('T00:00:00.000Z')
Eif (
timeIndex !== -1 &&
isoFormat.length - 'T00:00:00.000Z'.length === timeIndex
) {
return 'date'
} else {
return 'datetime'
}
}
return 'string'
}
logger('Unexpected attribute value type encountered')
return null
}
_ruleMatches(rule, obj) {
const attributes = obj.attributes || {}
if (!attributes.hasOwnProperty(rule.attributeName)) {
return false
}
const v = attributes[rule.attributeName]
const attributeType = Population.categorizeValueType(v)
const numberTypes = [RULE_TYPE_INT, RULE_TYPE_FLOAT]
Eif (
numberTypes.indexOf(attributeType) !== -1 &&
numberTypes.indexOf(rule.attributeType) !== -1
) {
// This is fine
} else if (attributeType !== rule.attributeType) {
return false
}
const targetVal = rule.value
const targetValList = rule.valueList
const op = rule.operator
Iif (attributeType === RULE_TYPE_STRING) {
if (op === RULE_OPERATOR_IS) {
return v === targetVal
} else if (op === RULE_OPERATOR_IS_NOT) {
return v !== targetVal
} else if (op === RULE_OPERATOR_IN) {
return targetValList.indexOf(v) !== -1
} else if (op === RULE_OPERATOR_NOT_IN) {
return targetValList.indexOf(v) === -1
} else {
logger('Invalid rule operator encountered')
return false
}
} else Eif (numberTypes.indexOf(attributeType) !== -1) {
Iif (op === RULE_OPERATOR_IS) {
return v === targetVal
} else Iif (op === RULE_OPERATOR_IS_NOT) {
return v !== targetVal
} else Iif (op === RULE_OPERATOR_IN) {
return targetValList.indexOf(v) !== -1
} else Iif (op === RULE_OPERATOR_NOT_IN) {
return targetValList.indexOf(v) === -1
} else Iif (op === RULE_OPERATOR_LT) {
return v < targetVal
} else Eif (op === RULE_OPERATOR_LTE) {
return v <= targetVal
} else if (op === RULE_OPERATOR_GT) {
return v > targetVal
} else if (op === RULE_OPERATOR_GTE) {
return v >= targetVal
} else {
logger('Invalid rule operator encountered')
return false
}
} else if (attributeType === RULE_TYPE_BOOLEAN) {
if (op === RULE_OPERATOR_IS) {
return v === targetVal
} else if (op === RULE_OPERATOR_IS_NOT) {
return v !== targetVal
} else {
logger('Invalid rule operator encountered')
return false
}
} else if (
attributeType === RULE_TYPE_DATE ||
attributeType === RULE_TYPE_DATETIME
) {
const targetTime = targetVal && new Date(targetVal).getTime()
const targetTimeList =
targetValList && targetValList.map(tv => new Date(tv).getTime())
const vTime = new Date(v).getTime()
if (op === RULE_OPERATOR_IS) {
return vTime === targetTime
} else if (op === RULE_OPERATOR_IS_NOT) {
return vTime !== targetTime
} else if (op === RULE_OPERATOR_IN) {
return targetTimeList.indexOf(vTime) !== -1
} else if (op === RULE_OPERATOR_NOT_IN) {
return targetTimeList.indexOf(vTime) === -1
} else if (op === RULE_OPERATOR_FROM) {
return vTime >= targetTime
} else if (op === RULE_OPERATOR_UNTIL) {
return vTime <= targetTime
} else if (op === RULE_OPERATOR_AFTER) {
return vTime > targetTime
} else if (op === RULE_OPERATOR_BEFORE) {
return vTime < targetTime
} else {
logger('Invalid rule operator encountered')
return false
}
} else {
logger('Invalid attribute type encountered')
return false
}
}
getGateValues(obj, env, flag, sticky) {
const population = this.population
if (this.population.entityType !== obj.type) {
return {eligible: false}
}
const rules = population.rules
let matches = true
for (let i = 0; i < rules.length; i++) {
const r = rules[i]
matches = matches && this._ruleMatches(r, obj)
}
if (matches) {
const samplingHashKey = `SAMPLING:control_${flag.hashKey}:env_${
env.hashKey
}:rule_set_${this.population.hashKey}:client_object_${obj.type}_${obj.id}`
const hashedPercentage = getHashedValue(samplingHashKey)
if (
hashedPercentage <= this.population.percentage &&
this.population.percentage > 0
) {
const splits = sticky
? this.population.universes[
Math.max(Math.floor(hashedPercentage * 100) - 1, 0)
]
: flag.splits
const splitsMap = {}
for (let i = 0; i < splits.length; i++) {
const split = splits[i]
splitsMap[split.treatmentId] = split
}
const allocationHashKey = `DISTRIBUTION:control_${flag.hashKey}:env_${
env.hashKey
}:client_object_${obj.type}_${obj.id}`
const allocationHashedPercentage = getHashedValue(allocationHashKey)
let trailingSum = 0.0
const treatments = flag.treatments.filter(t => !t.isOffTreatment)
let treatment = null
for (let i = 0; i < treatments.length; i++) {
const t = treatments[i]
Eif (splitsMap.hasOwnProperty(t.treatmentId)) {
trailingSum = parseFloat(
(trailingSum + splitsMap[t.treatmentId].percentage).toFixed(3)
)
if (allocationHashedPercentage <= trailingSum) {
treatment = t
break
}
}
}
return {treatment: treatment, eligible: true}
} else {
return {eligible: true}
}
} else {
return {eligible: false}
}
}
}
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