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Feature,
Segment,
DatafileContent,
SegmentKey,
FeatureKey,
Context,
Traffic,
Allocation,
GroupSegment,
Condition,
Force,
} from "@featurevisor/types";
import { conditionIsMatched } from "./conditions";
import { Logger } from "./logger";
export type GetRegex = (regexString: string, regexFlags: string) => RegExp;
export interface DatafileReaderOptions {
datafile: DatafileContent;
logger: Logger;
}
export interface ForceResult {
force?: Force;
forceIndex?: number;
}
export class DatafileReader {
private schemaVersion: string;
private revision: string;
private segments: Record<SegmentKey, Segment>;
private features: Record<FeatureKey, Feature>;
private logger: Logger;
// done to avoid creating new RegExp objects for the same regex string and flags.
// kept here to avoid memory leaks.
// if datafile is reset, this cache will be cleared.
private regexCache: Record<string, RegExp>;
constructor(options: DatafileReaderOptions) {
const { datafile, logger } = options;
this.logger = logger;
this.schemaVersion = datafile.schemaVersion;
this.revision = datafile.revision;
this.segments = datafile.segments;
this.features = datafile.features;
this.regexCache = {};
}
getRevision(): string {
return this.revision;
}
getSchemaVersion(): string {
return this.schemaVersion;
}
getSegment(segmentKey: SegmentKey): Segment | undefined {
const segment = this.segments[segmentKey];
if (!segment) {
return undefined;
}
segment.conditions = this.parseConditionsIfStringified(segment.conditions);
return segment;
}
getFeatureKeys(): string[] {
return Object.keys(this.features);
}
getFeature(featureKey: FeatureKey): Feature | undefined {
return this.features[featureKey];
}
getVariableKeys(featureKey: FeatureKey): string[] {
const feature = this.getFeature(featureKey);
if (!feature) {
return [];
}
return Object.keys(feature.variablesSchema || {});
}
hasVariations(featureKey: FeatureKey): boolean {
const feature = this.getFeature(featureKey);
if (!feature) {
return false;
}
return Array.isArray(feature.variations) && feature.variations.length > 0;
}
getRegex(regexString: string, regexFlags?: string): RegExp {
const flags = regexFlags || "";
const cacheKey = `${regexString}-${flags}`;
if (this.regexCache[cacheKey]) {
return this.regexCache[cacheKey];
}
const regex = new RegExp(regexString, flags);
this.regexCache[cacheKey] = regex;
return regex;
}
allConditionsAreMatched(conditions: Condition[] | Condition, context: Context): boolean {
if (typeof conditions === "string") {
if (conditions === "*") {
return true;
}
return false;
}
const getRegex = (regexString: string, regexFlags: string) =>
this.getRegex(regexString, regexFlags);
if ("attribute" in conditions) {
try {
return conditionIsMatched(conditions, context, getRegex);
} catch (e) {
this.logger.warn(e.message, {
error: e,
details: {
condition: conditions,
context,
},
});
return false;
}
}
if ("and" in conditions && Array.isArray(conditions.and)) {
return conditions.and.every((c) => this.allConditionsAreMatched(c, context));
}
if ("or" in conditions && Array.isArray(conditions.or)) {
return conditions.or.some((c) => this.allConditionsAreMatched(c, context));
}
if ("not" in conditions && Array.isArray(conditions.not)) {
return conditions.not.every(
() =>
this.allConditionsAreMatched(
{
and: conditions.not,
},
context,
) === false,
);
}
if (Array.isArray(conditions)) {
return conditions.every((c) => this.allConditionsAreMatched(c, context));
}
return false;
}
segmentIsMatched(segment: Segment, context: Context): boolean {
return this.allConditionsAreMatched(segment.conditions as Condition | Condition[], context);
}
allSegmentsAreMatched(
groupSegments: GroupSegment | GroupSegment[] | "*",
context: Context,
): boolean {
if (groupSegments === "*") {
return true;
}
if (typeof groupSegments === "string") {
const segment = this.getSegment(groupSegments);
if (segment) {
return this.segmentIsMatched(segment, context);
}
return false;
}
if (typeof groupSegments === "object") {
if ("and" in groupSegments && Array.isArray(groupSegments.and)) {
return groupSegments.and.every((groupSegment) =>
this.allSegmentsAreMatched(groupSegment, context),
);
}
if ("or" in groupSegments && Array.isArray(groupSegments.or)) {
return groupSegments.or.some((groupSegment) =>
this.allSegmentsAreMatched(groupSegment, context),
);
}
if ("not" in groupSegments && Array.isArray(groupSegments.not)) {
return groupSegments.not.every(
(groupSegment) => this.allSegmentsAreMatched(groupSegment, context) === false,
);
}
}
if (Array.isArray(groupSegments)) {
return groupSegments.every((groupSegment) =>
this.allSegmentsAreMatched(groupSegment, context),
);
}
return false;
}
getMatchedTraffic(traffic: Traffic[], context: Context): Traffic | undefined {
return traffic.find((t) => {
if (!this.allSegmentsAreMatched(this.parseSegmentsIfStringified(t.segments), context)) {
return false;
}
return true;
});
}
getMatchedAllocation(traffic: Traffic, bucketValue: number): Allocation | undefined {
if (!traffic.allocation) {
return undefined;
}
for (const allocation of traffic.allocation) {
const [start, end] = allocation.range;
if (allocation.range && start <= bucketValue && end >= bucketValue) {
return allocation;
}
}
return undefined;
}
getMatchedForce(featureKey: FeatureKey | Feature, context: Context): ForceResult {
const result: ForceResult = {
force: undefined,
forceIndex: undefined,
};
const feature = typeof featureKey === "string" ? this.getFeature(featureKey) : featureKey;
if (!feature || !feature.force) {
return result;
}
for (let i = 0; i < feature.force.length; i++) {
const currentForce = feature.force[i];
if (
currentForce.conditions &&
this.allConditionsAreMatched(
this.parseConditionsIfStringified(currentForce.conditions),
context,
)
) {
result.force = currentForce;
result.forceIndex = i;
break;
}
if (
currentForce.segments &&
this.allSegmentsAreMatched(this.parseSegmentsIfStringified(currentForce.segments), context)
) {
result.force = currentForce;
result.forceIndex = i;
break;
}
}
return result;
}
parseConditionsIfStringified(conditions: Condition | Condition[]): Condition | Condition[] {
if (typeof conditions !== "string") {
// already parsed
return conditions;
}
Iif (conditions === "*") {
// everyone
return conditions;
}
try {
return JSON.parse(conditions);
} catch (e) {
this.logger.error("Error parsing conditions", {
error: e,
details: {
conditions,
},
});
return conditions;
}
}
parseSegmentsIfStringified(
segments: GroupSegment | GroupSegment[],
): GroupSegment | GroupSegment[] {
if (typeof segments === "string" && (segments.startsWith("{") || segments.startsWith("["))) {
return JSON.parse(segments);
}
return segments;
}
}
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