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Context,
DatafileContent,
Feature,
FeatureKey,
InitialFeatures,
StickyFeatures,
VariableType,
VariableValue,
VariationValue,
VariableKey,
} from "@featurevisor/types";
import { createLogger, Logger, LogLevel } from "./logger";
import { DatafileReader } from "./datafileReader";
import { Emitter } from "./emitter";
import { ConfigureBucketKey, ConfigureBucketValue } from "./bucket";
import { Evaluation, evaluate } from "./evaluate";
export type ReadyCallback = () => void;
export type ActivationCallback = (
featureName: string,
variation: VariationValue,
context: Context,
captureContext: Context,
) => void;
export interface Statuses {
ready: boolean;
refreshInProgress: boolean;
}
const DEFAULT_BUCKET_KEY_SEPARATOR = ".";
export type InterceptContext = (context: Context) => Context;
export interface InstanceOptions {
bucketKeySeparator?: string;
configureBucketKey?: ConfigureBucketKey;
configureBucketValue?: ConfigureBucketValue;
datafile?: DatafileContent | string;
datafileUrl?: string;
handleDatafileFetch?: (datafileUrl: string) => Promise<DatafileContent>;
initialFeatures?: InitialFeatures;
interceptContext?: InterceptContext;
logger?: Logger;
onActivation?: ActivationCallback;
onReady?: ReadyCallback;
onRefresh?: () => void;
onUpdate?: () => void;
refreshInterval?: number; // seconds
stickyFeatures?: StickyFeatures;
}
const emptyDatafile: DatafileContent = {
schemaVersion: "1",
revision: "unknown",
attributes: [],
segments: [],
features: [],
};
export type DatafileFetchHandler = (datafileUrl: string) => Promise<DatafileContent>;
function fetchDatafileContent(
datafileUrl,
handleDatafileFetch?: DatafileFetchHandler,
): Promise<DatafileContent> {
if (handleDatafileFetch) {
return handleDatafileFetch(datafileUrl);
}
return fetch(datafileUrl).then((res) => res.json());
}
type FieldType = string | VariableType;
type ValueType = VariableValue;
export function getValueByType(value: ValueType, fieldType: FieldType): ValueType {
try {
Iif (value === undefined) {
return undefined;
}
switch (fieldType) {
case "string":
return typeof value === "string" ? value : undefined;
case "integer":
return parseInt(value as string, 10);
case "double":
return parseFloat(value as string);
case "boolean":
return value === true;
case "array":
return Array.isArray(value) ? value : undefined;
case "object":
return typeof value === "object" ? value : undefined;
// @NOTE: `json` is not handled here intentionally
default:
return value;
}
} catch (e) {
return undefined;
}
}
export class FeaturevisorInstance {
// from options
private bucketKeySeparator: string;
private configureBucketKey?: ConfigureBucketKey;
private configureBucketValue?: ConfigureBucketValue;
private datafileUrl?: string;
private handleDatafileFetch?: DatafileFetchHandler;
private initialFeatures?: InitialFeatures;
private interceptContext?: InterceptContext;
private logger: Logger;
private refreshInterval?: number; // seconds
private stickyFeatures?: StickyFeatures;
// internally created
private datafileReader: DatafileReader;
private emitter: Emitter;
private statuses: Statuses;
private intervalId?: ReturnType<typeof setInterval>;
// exposed from emitter
public on: Emitter["addListener"];
public addListener: Emitter["addListener"];
public off: Emitter["removeListener"];
public removeListener: Emitter["removeListener"];
public removeAllListeners: Emitter["removeAllListeners"];
constructor(options: InstanceOptions) {
// from options
this.bucketKeySeparator = options.bucketKeySeparator || DEFAULT_BUCKET_KEY_SEPARATOR;
this.configureBucketKey = options.configureBucketKey;
this.configureBucketValue = options.configureBucketValue;
this.datafileUrl = options.datafileUrl;
this.handleDatafileFetch = options.handleDatafileFetch;
this.initialFeatures = options.initialFeatures;
this.interceptContext = options.interceptContext;
this.logger = options.logger || createLogger();
this.refreshInterval = options.refreshInterval;
this.stickyFeatures = options.stickyFeatures;
// internal
this.emitter = new Emitter();
this.statuses = {
ready: false,
refreshInProgress: false,
};
// register events
if (options.onReady) {
this.emitter.addListener("ready", options.onReady);
}
if (options.onRefresh) {
this.emitter.addListener("refresh", options.onRefresh);
}
if (options.onUpdate) {
this.emitter.addListener("update", options.onUpdate);
}
if (options.onActivation) {
this.emitter.addListener("activation", options.onActivation);
}
// expose emitter methods
const on = this.emitter.addListener.bind(this.emitter);
this.on = on;
this.addListener = on;
const off = this.emitter.removeListener.bind(this.emitter);
this.off = off;
this.removeListener = off;
this.removeAllListeners = this.emitter.removeAllListeners.bind(this.emitter);
// datafile
if (options.datafileUrl) {
this.setDatafile(options.datafile || emptyDatafile);
fetchDatafileContent(options.datafileUrl, options.handleDatafileFetch)
.then((datafile) => {
this.setDatafile(datafile);
this.statuses.ready = true;
this.emitter.emit("ready");
if (this.refreshInterval) {
this.startRefreshing();
}
})
.catch((e) => {
this.logger.error("failed to fetch datafile", { error: e });
});
} else if (options.datafile) {
this.setDatafile(options.datafile);
this.statuses.ready = true;
setTimeout(() => {
this.emitter.emit("ready");
}, 0);
} else E{
throw new Error(
"Featurevisor SDK instance cannot be created without both `datafile` and `datafileUrl` options",
);
}
}
setLogLevels(levels: LogLevel[]) {
this.logger.setLevels(levels);
}
onReady(): Promise<FeaturevisorInstance> {
return new Promise((resolve) => {
if (this.statuses.ready) {
return resolve(this);
}
const cb = () => {
this.emitter.removeListener("ready", cb);
resolve(this);
};
this.emitter.addListener("ready", cb);
});
}
setDatafile(datafile: DatafileContent | string) {
try {
this.datafileReader = new DatafileReader(
typeof datafile === "string" ? JSON.parse(datafile) : datafile,
);
} catch (e) {
this.logger.error("could not parse datafile", { error: e });
}
}
setStickyFeatures(stickyFeatures: StickyFeatures | undefined) {
this.stickyFeatures = stickyFeatures;
}
getRevision(): string {
return this.datafileReader.getRevision();
}
getFeature(featureKey: string | Feature): Feature | undefined {
return typeof featureKey === "string"
? this.datafileReader.getFeature(featureKey) // only key provided
: featureKey; // full feature provided
}
/**
* Statuses
*/
isReady(): boolean {
return this.statuses.ready;
}
/**
* Refresh
*/
refresh() {
this.logger.debug("refreshing datafile");
Iif (this.statuses.refreshInProgress) {
return this.logger.warn("refresh in progress, skipping");
}
Iif (!this.datafileUrl) {
return this.logger.error("cannot refresh since `datafileUrl` is not provided");
}
this.statuses.refreshInProgress = true;
fetchDatafileContent(this.datafileUrl, this.handleDatafileFetch)
.then((datafile) => {
const currentRevision = this.getRevision();
const newRevision = datafile.revision;
const isNotSameRevision = currentRevision !== newRevision;
this.setDatafile(datafile);
this.logger.info("refreshed datafile");
this.emitter.emit("refresh");
if (isNotSameRevision) {
this.emitter.emit("update");
}
this.statuses.refreshInProgress = false;
})
.catch((e) => {
this.logger.error("failed to refresh datafile", { error: e });
this.statuses.refreshInProgress = false;
});
}
startRefreshing() {
Iif (!this.datafileUrl) {
return this.logger.error("cannot start refreshing since `datafileUrl` is not provided");
}
Iif (this.intervalId) {
return this.logger.warn("refreshing has already started");
}
Iif (!this.refreshInterval) {
return this.logger.warn("no `refreshInterval` option provided");
}
this.intervalId = setInterval(() => {
this.refresh();
}, this.refreshInterval * 1000);
}
stopRefreshing() {
Iif (!this.intervalId) {
return this.logger.warn("refreshing has not started yet");
}
clearInterval(this.intervalId);
}
/**
* Flag
*/
evaluateFlag(featureKey: FeatureKey | Feature, context: Context = {}): Evaluation {
return evaluate({
type: "flag",
featureKey,
context,
logger: this.logger,
datafileReader: this.datafileReader,
statuses: this.statuses,
interceptContext: this.interceptContext,
stickyFeatures: this.stickyFeatures,
initialFeatures: this.initialFeatures,
bucketKeySeparator: this.bucketKeySeparator,
configureBucketKey: this.configureBucketKey,
configureBucketValue: this.configureBucketValue,
});
}
isEnabled(featureKey: FeatureKey | Feature, context: Context = {}): boolean {
try {
const evaluation = this.evaluateFlag(featureKey, context);
return evaluation.enabled === true;
} catch (e) {
this.logger.error("isEnabled", { featureKey, error: e });
return false;
}
}
/**
* Variation
*/
evaluateVariation(featureKey: FeatureKey | Feature, context: Context = {}): Evaluation {
return evaluate({
type: "variation",
featureKey,
context,
logger: this.logger,
datafileReader: this.datafileReader,
statuses: this.statuses,
interceptContext: this.interceptContext,
stickyFeatures: this.stickyFeatures,
initialFeatures: this.initialFeatures,
bucketKeySeparator: this.bucketKeySeparator,
configureBucketKey: this.configureBucketKey,
configureBucketValue: this.configureBucketValue,
});
}
getVariation(
featureKey: FeatureKey | Feature,
context: Context = {},
): VariationValue | undefined {
try {
const evaluation = this.evaluateVariation(featureKey, context);
if (typeof evaluation.variationValue !== "undefined") {
return evaluation.variationValue;
}
if (evaluation.variation) {
return evaluation.variation.value;
}
return undefined;
} catch (e) {
this.logger.error("getVariation", { featureKey, error: e });
return undefined;
}
}
/**
* Activate
*/
activate(featureKey: FeatureKey, context: Context = {}): VariationValue | undefined {
try {
const evaluation = this.evaluateVariation(featureKey, context);
const variationValue = evaluation.variation
? evaluation.variation.value
: evaluation.variationValue;
Iif (typeof variationValue === "undefined") {
return undefined;
}
const finalContext = this.interceptContext ? this.interceptContext(context) : context;
const captureContext: Context = {};
const attributesForCapturing = this.datafileReader
.getAllAttributes()
.filter((a) => a.capture === true);
attributesForCapturing.forEach((a) => {
Iif (typeof finalContext[a.key] !== "undefined") {
captureContext[a.key] = context[a.key];
}
});
this.emitter.emit(
"activation",
featureKey,
variationValue,
finalContext,
captureContext,
evaluation,
);
return variationValue;
} catch (e) {
this.logger.error("activate", { featureKey, error: e });
return undefined;
}
}
/**
* Variable
*/
evaluateVariable(
featureKey: FeatureKey | Feature,
variableKey: VariableKey,
context: Context = {},
): Evaluation {
return evaluate({
type: "variable",
featureKey,
variableKey,
context,
logger: this.logger,
datafileReader: this.datafileReader,
statuses: this.statuses,
interceptContext: this.interceptContext,
stickyFeatures: this.stickyFeatures,
initialFeatures: this.initialFeatures,
bucketKeySeparator: this.bucketKeySeparator,
configureBucketKey: this.configureBucketKey,
configureBucketValue: this.configureBucketValue,
});
}
getVariable(
featureKey: FeatureKey | Feature,
variableKey: string,
context: Context = {},
): VariableValue | undefined {
try {
const evaluation = this.evaluateVariable(featureKey, variableKey, context);
if (typeof evaluation.variableValue !== "undefined") {
if (
evaluation.variableSchema &&
evaluation.variableSchema.type === "json" &&
typeof evaluation.variableValue === "string"
) {
return JSON.parse(evaluation.variableValue);
}
return evaluation.variableValue;
}
return undefined;
} catch (e) {
this.logger.error("getVariable", { featureKey, variableKey, error: e });
return undefined;
}
}
getVariableBoolean(
featureKey: FeatureKey | Feature,
variableKey: string,
context: Context = {},
): boolean | undefined {
const variableValue = this.getVariable(featureKey, variableKey, context);
return getValueByType(variableValue, "boolean") as boolean | undefined;
}
getVariableString(
featureKey: FeatureKey | Feature,
variableKey: string,
context: Context = {},
): string | undefined {
const variableValue = this.getVariable(featureKey, variableKey, context);
return getValueByType(variableValue, "string") as string | undefined;
}
getVariableInteger(
featureKey: FeatureKey | Feature,
variableKey: string,
context: Context = {},
): number | undefined {
const variableValue = this.getVariable(featureKey, variableKey, context);
return getValueByType(variableValue, "integer") as number | undefined;
}
getVariableDouble(
featureKey: FeatureKey | Feature,
variableKey: string,
context: Context = {},
): number | undefined {
const variableValue = this.getVariable(featureKey, variableKey, context);
return getValueByType(variableValue, "double") as number | undefined;
}
getVariableArray(
featureKey: FeatureKey | Feature,
variableKey: string,
context: Context = {},
): string[] | undefined {
const variableValue = this.getVariable(featureKey, variableKey, context);
return getValueByType(variableValue, "array") as string[] | undefined;
}
getVariableObject<T>(
featureKey: FeatureKey | Feature,
variableKey: string,
context: Context = {},
): T | undefined {
const variableValue = this.getVariable(featureKey, variableKey, context);
return getValueByType(variableValue, "object") as T | undefined;
}
getVariableJSON<T>(
featureKey: FeatureKey | Feature,
variableKey: string,
context: Context = {},
): T | undefined {
const variableValue = this.getVariable(featureKey, variableKey, context);
return getValueByType(variableValue, "json") as T | undefined;
}
}
export function createInstance(options: InstanceOptions): FeaturevisorInstance {
return new FeaturevisorInstance(options);
}
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