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FeatureKey,
Context,
RuleKey,
Traffic,
Force,
Required,
Variation,
VariationValue,
VariableKey,
VariableValue,
VariableSchema,
EvaluatedFeature,
StickyFeatures,
Allocation,
} from "@featurevisor/types";
import { Logger } from "./logger";
import { HooksManager } from "./hooks";
import { DatafileReader } from "./datafileReader";
import { BucketKey, BucketValue, getBucketKey, getBucketedNumber } from "./bucketer";
export enum EvaluationReason {
// feature specific
FEATURE_NOT_FOUND = "feature_not_found", // feature is not found in datafile
DISABLED = "disabled", // feature is disabled
REQUIRED = "required", // required features are not enabled
OUT_OF_RANGE = "out_of_range", // out of range when mutually exclusive experiments are involved via Groups
// variations specific
NO_VARIATIONS = "no_variations", // feature has no variations
VARIATION_DISABLED = "variation_disabled", // feature is disabled, and variation's disabledVariationValue is used
// variable specific
VARIABLE_NOT_FOUND = "variable_not_found", // variable's schema is not defined in the feature
VARIABLE_DEFAULT = "variable_default", // default variable value used
VARIABLE_DISABLED = "variable_disabled", // feature is disabled, and variable's disabledValue is used
VARIABLE_OVERRIDE = "variable_override", // variable overridden from inside a variation
// common
NO_MATCH = "no_match", // no rules matched
FORCED = "forced", // against a forced rule
STICKY = "sticky", // against a sticky feature
RULE = "rule", // against a regular rule
ALLOCATED = "allocated", // regular allocation based on bucketing
ERROR = "error", // error
}
type EvaluationType = "flag" | "variation" | "variable";
export interface Evaluation {
// required
type: EvaluationType;
featureKey: FeatureKey;
reason: EvaluationReason;
// common
bucketKey?: BucketKey;
bucketValue?: BucketValue;
ruleKey?: RuleKey;
error?: Error;
enabled?: boolean;
traffic?: Traffic;
forceIndex?: number;
force?: Force;
required?: Required[];
sticky?: EvaluatedFeature;
// variation
variation?: Variation;
variationValue?: VariationValue;
// variable
variableKey?: VariableKey;
variableValue?: VariableValue;
variableSchema?: VariableSchema;
}
export interface EvaluateDependencies {
context: Context;
logger: Logger;
hooksManager: HooksManager;
datafileReader: DatafileReader;
// OverrideOptions
sticky?: StickyFeatures;
defaultVariationValue?: VariationValue;
defaultVariableValue?: VariableValue;
}
export interface EvaluateParams {
type: EvaluationType;
featureKey: FeatureKey;
variableKey?: VariableKey;
}
export type EvaluateOptions = EvaluateParams & EvaluateDependencies;
export function evaluateWithHooks(opts: EvaluateOptions): Evaluation {
try {
const { hooksManager } = opts;
const hooks = hooksManager.getAll();
// run before hooks
let options = opts;
for (const hook of hooksManager.getAll()) {
if (hook.before) {
options = hook.before(options);
}
}
// evaluate
let evaluation = evaluate(options);
// default: variation
Iif (
typeof options.defaultVariationValue !== "undefined" &&
evaluation.type === "variation" &&
typeof evaluation.variationValue === "undefined"
) {
evaluation.variationValue = options.defaultVariationValue;
}
// default: variable
Iif (
typeof options.defaultVariableValue !== "undefined" &&
evaluation.type === "variable" &&
typeof evaluation.variableValue === "undefined"
) {
evaluation.variableValue = options.defaultVariableValue;
}
// run after hooks
for (const hook of hooks) {
if (hook.after) {
evaluation = hook.after(evaluation, options);
}
}
return evaluation;
} catch (e) {
const { type, featureKey, variableKey, logger } = opts;
const evaluation: Evaluation = {
type,
featureKey,
variableKey,
reason: EvaluationReason.ERROR,
error: e,
};
logger.error("error during evaluation", evaluation);
return evaluation;
}
}
export function evaluate(options: EvaluateOptions): Evaluation {
const { type, featureKey, variableKey, context, logger, datafileReader, sticky, hooksManager } =
options;
const hooks = hooksManager.getAll();
let evaluation: Evaluation;
try {
/**
* Root flag evaluation
*/
let flag: Evaluation;
if (type !== "flag") {
// needed by variation and variable evaluations
flag = evaluate({
...options,
type: "flag",
});
if (flag.enabled === false) {
evaluation = {
type,
featureKey,
reason: EvaluationReason.DISABLED,
};
const feature = datafileReader.getFeature(featureKey);
// serve variable default value if feature is disabled (if explicitly specified)
if (type === "variable") {
if (
feature &&
variableKey &&
feature.variablesSchema &&
feature.variablesSchema[variableKey]
) {
const variableSchema = feature.variablesSchema[variableKey];
Iif (typeof variableSchema.disabledValue !== "undefined") {
// disabledValue: <value>
evaluation = {
type,
featureKey,
reason: EvaluationReason.VARIABLE_DISABLED,
variableKey,
variableValue: variableSchema.disabledValue,
variableSchema,
enabled: false,
};
} else Iif (variableSchema.useDefaultWhenDisabled) {
// useDefaultWhenDisabled: true
evaluation = {
type,
featureKey,
reason: EvaluationReason.VARIABLE_DEFAULT,
variableKey,
variableValue: variableSchema.defaultValue,
variableSchema,
enabled: false,
};
}
}
}
// serve disabled variation value if feature is disabled (if explicitly specified)
Iif (type === "variation" && feature && feature.disabledVariationValue) {
evaluation = {
type,
featureKey,
reason: EvaluationReason.VARIATION_DISABLED,
variationValue: feature.disabledVariationValue,
enabled: false,
};
}
logger.debug("feature is disabled", evaluation);
return evaluation;
}
}
/**
* Sticky
*/
if (sticky && sticky[featureKey]) {
// flag
if (type === "flag" && typeof sticky[featureKey].enabled !== "undefined") {
evaluation = {
type,
featureKey,
reason: EvaluationReason.STICKY,
sticky: sticky[featureKey],
enabled: sticky[featureKey].enabled,
};
logger.debug("using sticky enabled", evaluation);
return evaluation;
}
// variation
if (type === "variation") {
const variationValue = sticky[featureKey].variation;
if (typeof variationValue !== "undefined") {
evaluation = {
type,
featureKey,
reason: EvaluationReason.STICKY,
variationValue,
};
logger.debug("using sticky variation", evaluation);
return evaluation;
}
}
// variable
if (variableKey) {
const variables = sticky[featureKey].variables;
if (variables) {
const result = variables[variableKey];
if (typeof result !== "undefined") {
evaluation = {
type,
featureKey,
reason: EvaluationReason.STICKY,
variableKey,
variableValue: result,
};
logger.debug("using sticky variable", evaluation);
return evaluation;
}
}
}
}
/**
* Feature
*/
const feature =
typeof featureKey === "string" ? datafileReader.getFeature(featureKey) : featureKey;
// feature: not found
if (!feature) {
evaluation = {
type,
featureKey,
reason: EvaluationReason.FEATURE_NOT_FOUND,
};
logger.warn("feature not found", evaluation);
return evaluation;
}
// feature: deprecated
if (type === "flag" && feature.deprecated) {
logger.warn("feature is deprecated", { featureKey });
}
// variableSchema
let variableSchema: VariableSchema | undefined;
if (variableKey) {
if (feature.variablesSchema && feature.variablesSchema[variableKey]) {
variableSchema = feature.variablesSchema[variableKey];
}
// variable schema not found
if (!variableSchema) {
evaluation = {
type,
featureKey,
reason: EvaluationReason.VARIABLE_NOT_FOUND,
variableKey,
};
logger.warn("variable schema not found", evaluation);
return evaluation;
}
Iif (variableSchema.deprecated) {
logger.warn("variable is deprecated", {
featureKey,
variableKey,
});
}
}
// variation: no variations
if (type === "variation" && (!feature.variations || feature.variations.length === 0)) {
evaluation = {
type,
featureKey,
reason: EvaluationReason.NO_VARIATIONS,
};
logger.warn("no variations", evaluation);
return evaluation;
}
/**
* Forced
*/
const { force, forceIndex } = datafileReader.getMatchedForce(feature, context);
if (force) {
// flag
if (type === "flag" && typeof force.enabled !== "undefined") {
evaluation = {
type,
featureKey,
reason: EvaluationReason.FORCED,
forceIndex,
force,
enabled: force.enabled,
};
logger.debug("forced enabled found", evaluation);
return evaluation;
}
// variation
if (type === "variation" && force.variation && feature.variations) {
const variation = feature.variations.find((v) => v.value === force.variation);
if (variation) {
evaluation = {
type,
featureKey,
reason: EvaluationReason.FORCED,
forceIndex,
force,
variation,
};
logger.debug("forced variation found", evaluation);
return evaluation;
}
}
// variable
if (variableKey && force.variables && typeof force.variables[variableKey] !== "undefined") {
evaluation = {
type,
featureKey,
reason: EvaluationReason.FORCED,
forceIndex,
force,
variableKey,
variableSchema,
variableValue: force.variables[variableKey],
};
logger.debug("forced variable", evaluation);
return evaluation;
}
}
/**
* Required
*/
if (type === "flag" && feature.required && feature.required.length > 0) {
const requiredFeaturesAreEnabled = feature.required.every((required) => {
let requiredKey;
let requiredVariation;
if (typeof required === "string") {
requiredKey = required;
} else {
requiredKey = required.key;
requiredVariation = required.variation;
}
const requiredEvaluation = evaluate({
...options,
type: "flag",
featureKey: requiredKey,
});
const requiredIsEnabled = requiredEvaluation.enabled;
if (!requiredIsEnabled) {
return false;
}
if (typeof requiredVariation !== "undefined") {
const requiredVariationEvaluation = evaluate({
...options,
type: "variation",
featureKey: requiredKey,
});
let requiredVariationValue;
Iif (requiredVariationEvaluation.variationValue) {
requiredVariationValue = requiredVariationEvaluation.variationValue;
} else if (requiredVariationEvaluation.variation) {
requiredVariationValue = requiredVariationEvaluation.variation.value;
}
return requiredVariationValue === requiredVariation;
}
return true;
});
if (!requiredFeaturesAreEnabled) {
evaluation = {
type,
featureKey,
reason: EvaluationReason.REQUIRED,
required: feature.required,
enabled: requiredFeaturesAreEnabled,
};
logger.debug("required features not enabled", evaluation);
return evaluation;
}
}
/**
* Bucketing
*/
// bucketKey
let bucketKey = getBucketKey({
featureKey,
bucketBy: feature.bucketBy,
context,
logger,
});
for (const hook of hooks) {
if (hook.bucketKey) {
bucketKey = hook.bucketKey({
featureKey,
context,
bucketBy: feature.bucketBy,
bucketKey,
});
}
}
// bucketValue
let bucketValue = getBucketedNumber(bucketKey);
for (const hook of hooks) {
if (hook.bucketValue) {
bucketValue = hook.bucketValue({
featureKey,
bucketKey,
context,
bucketValue,
});
}
}
let matchedTraffic: Traffic | undefined;
let matchedAllocation: Allocation | undefined;
if (type !== "flag") {
matchedTraffic = datafileReader.getMatchedTraffic(feature.traffic, context);
if (matchedTraffic) {
matchedAllocation = datafileReader.getMatchedAllocation(matchedTraffic, bucketValue);
}
} else {
matchedTraffic = datafileReader.getMatchedTraffic(feature.traffic, context);
}
if (matchedTraffic) {
// percentage: 0
if (matchedTraffic.percentage === 0) {
evaluation = {
type,
featureKey,
reason: EvaluationReason.RULE,
bucketKey,
bucketValue,
ruleKey: matchedTraffic.key,
traffic: matchedTraffic,
enabled: false,
};
logger.debug("matched rule with 0 percentage", evaluation);
return evaluation;
}
// flag
if (type === "flag") {
// flag: check if mutually exclusive
if (feature.ranges && feature.ranges.length > 0) {
const matchedRange = feature.ranges.find((range) => {
return bucketValue >= range[0] && bucketValue < range[1];
});
// matched
if (matchedRange) {
evaluation = {
type,
featureKey,
reason: EvaluationReason.ALLOCATED,
bucketKey,
bucketValue,
ruleKey: matchedTraffic.key,
traffic: matchedTraffic,
enabled:
typeof matchedTraffic.enabled === "undefined" ? true : matchedTraffic.enabled,
};
logger.debug("matched", evaluation);
return evaluation;
}
// no match
evaluation = {
type,
featureKey,
reason: EvaluationReason.OUT_OF_RANGE,
bucketKey,
bucketValue,
enabled: false,
};
logger.debug("not matched", evaluation);
return evaluation;
}
// flag: override from rule
if (typeof matchedTraffic.enabled !== "undefined") {
evaluation = {
type,
featureKey,
reason: EvaluationReason.RULE,
bucketKey,
bucketValue,
ruleKey: matchedTraffic.key,
traffic: matchedTraffic,
enabled: matchedTraffic.enabled,
};
logger.debug("override from rule", evaluation);
return evaluation;
}
// treated as enabled because of matched traffic
if (bucketValue <= matchedTraffic.percentage) {
evaluation = {
type,
featureKey,
reason: EvaluationReason.RULE,
bucketKey,
bucketValue,
ruleKey: matchedTraffic.key,
traffic: matchedTraffic,
enabled: true,
};
logger.debug("matched traffic", evaluation);
return evaluation;
}
}
// variation
if (type === "variation" && feature.variations) {
// override from rule
if (matchedTraffic.variation) {
const variation = feature.variations.find((v) => v.value === matchedTraffic.variation);
if (variation) {
evaluation = {
type,
featureKey,
reason: EvaluationReason.RULE,
bucketKey,
bucketValue,
ruleKey: matchedTraffic.key,
traffic: matchedTraffic,
variation,
};
logger.debug("override from rule", evaluation);
return evaluation;
}
}
// regular allocation
if (matchedAllocation && matchedAllocation.variation) {
const variation = feature.variations.find((v) => v.value === matchedAllocation.variation);
if (variation) {
evaluation = {
type,
featureKey,
reason: EvaluationReason.ALLOCATED,
bucketKey,
bucketValue,
ruleKey: matchedTraffic.key,
traffic: matchedTraffic,
variation,
};
logger.debug("allocated variation", evaluation);
return evaluation;
}
}
}
}
// variable
if (type === "variable" && variableKey) {
// override from rule
if (
matchedTraffic &&
matchedTraffic.variables &&
typeof matchedTraffic.variables[variableKey] !== "undefined"
) {
evaluation = {
type,
featureKey,
reason: EvaluationReason.RULE,
bucketKey,
bucketValue,
ruleKey: matchedTraffic.key,
traffic: matchedTraffic,
variableKey,
variableSchema,
variableValue: matchedTraffic.variables[variableKey],
};
logger.debug("override from rule", evaluation);
return evaluation;
}
// check variations
let variationValue;
if (force && force.variation) {
variationValue = force.variation;
} else if (matchedTraffic && matchedTraffic.variation) {
variationValue = matchedTraffic.variation;
} else if (matchedAllocation && matchedAllocation.variation) {
variationValue = matchedAllocation.variation;
}
if (variationValue && Array.isArray(feature.variations)) {
const variation = feature.variations.find((v) => v.value === variationValue);
if (variation && variation.variableOverrides && variation.variableOverrides[variableKey]) {
const overrides = variation.variableOverrides[variableKey];
const override = overrides.find((o) => {
if (o.conditions) {
return datafileReader.allConditionsAreMatched(
typeof o.conditions === "string" && o.conditions !== "*"
? JSON.parse(o.conditions)
: o.conditions,
context,
);
}
if (o.segments) {
return datafileReader.allSegmentsAreMatched(
datafileReader.parseSegmentsIfStringified(o.segments),
context,
);
}
return false;
});
if (override) {
evaluation = {
type,
featureKey,
reason: EvaluationReason.VARIABLE_OVERRIDE,
bucketKey,
bucketValue,
ruleKey: matchedTraffic?.key,
traffic: matchedTraffic,
variableKey,
variableSchema,
variableValue: override.value,
};
logger.debug("variable override", evaluation);
return evaluation;
}
}
if (
variation &&
variation.variables &&
typeof variation.variables[variableKey] !== "undefined"
) {
evaluation = {
type,
featureKey,
reason: EvaluationReason.ALLOCATED,
bucketKey,
bucketValue,
ruleKey: matchedTraffic?.key,
traffic: matchedTraffic,
variableKey,
variableSchema,
variableValue: variation.variables[variableKey],
};
logger.debug("allocated variable", evaluation);
return evaluation;
}
}
}
/**
* Nothing matched
*/
Iif (type === "variation") {
evaluation = {
type,
featureKey,
reason: EvaluationReason.NO_MATCH,
bucketKey,
bucketValue,
};
logger.debug("no matched variation", evaluation);
return evaluation;
}
if (type === "variable") {
if (variableSchema) {
evaluation = {
type,
featureKey,
reason: EvaluationReason.VARIABLE_DEFAULT,
bucketKey,
bucketValue,
variableKey,
variableSchema,
variableValue: variableSchema.defaultValue,
};
logger.debug("using default value", evaluation);
return evaluation;
}
evaluation = {
type,
featureKey,
reason: EvaluationReason.VARIABLE_NOT_FOUND,
variableKey,
bucketKey,
bucketValue,
};
logger.debug("variable not found", evaluation);
return evaluation;
}
evaluation = {
type,
featureKey,
reason: EvaluationReason.NO_MATCH,
bucketKey,
bucketValue,
enabled: false,
};
logger.debug("nothing matched", evaluation);
return evaluation;
} catch (e) {
evaluation = {
type,
featureKey,
variableKey,
reason: EvaluationReason.ERROR,
error: e,
};
logger.error("error", evaluation);
return evaluation;
}
}
|