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strategy.ts
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strategy.ts
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import { gt as semverGt, lt as semverLt, eq as semverEq, clean as cleanSemver } from 'semver';
import { Context } from '../context';
import { resolveContextValue } from '../helpers';
import { selectVariantDefinition, Variant, VariantDefinition } from '../variant';
export interface StrategyTransportInterface {
name: string;
parameters: any;
constraints: Constraint[];
segments?: number[];
variants?: VariantDefinition[];
}
export interface EnhancedStrategyTransportInterface
extends Omit<StrategyTransportInterface, 'segments'> {
segments?: Array<Segment | undefined>;
}
export interface Constraint {
contextName: string;
operator: Operator;
inverted: boolean;
values: string[];
value?: string | number | Date;
caseInsensitive?: boolean;
}
export interface Segment {
id: number;
constraints: Constraint[];
}
export enum Operator {
IN = 'IN',
NOT_IN = 'NOT_IN',
STR_ENDS_WITH = 'STR_ENDS_WITH',
STR_STARTS_WITH = 'STR_STARTS_WITH',
STR_CONTAINS = 'STR_CONTAINS',
NUM_EQ = 'NUM_EQ',
NUM_GT = 'NUM_GT',
NUM_GTE = 'NUM_GTE',
NUM_LT = 'NUM_LT',
NUM_LTE = 'NUM_LTE',
DATE_AFTER = 'DATE_AFTER',
DATE_BEFORE = 'DATE_BEFORE',
SEMVER_EQ = 'SEMVER_EQ',
SEMVER_GT = 'SEMVER_GT',
SEMVER_LT = 'SEMVER_LT',
}
export type OperatorImpl = (constraint: Constraint, context: Context) => boolean;
const cleanValues = (values: string[]) => values.filter((v) => !!v).map((v) => v.trim());
const isStrictSemver = (version: string) => cleanSemver(version) === version;
const InOperator = (constraint: Constraint, context: Context) => {
const field = constraint.contextName;
const values = cleanValues(constraint.values);
const contextValue = resolveContextValue(context, field);
const isIn = values.some((val) => val === contextValue);
return constraint.operator === Operator.IN ? isIn : !isIn;
};
const StringOperator = (constraint: Constraint, context: Context) => {
const { contextName, operator, caseInsensitive } = constraint;
let values = cleanValues(constraint.values);
let contextValue = resolveContextValue(context, contextName);
if (caseInsensitive) {
values = values.map((v) => v.toLocaleLowerCase());
contextValue = contextValue?.toLocaleLowerCase();
}
if (typeof contextValue !== 'string') {
return false;
}
if (operator === Operator.STR_STARTS_WITH) {
return values.some((val) => contextValue?.startsWith(val));
}
if (operator === Operator.STR_ENDS_WITH) {
return values.some((val) => contextValue?.endsWith(val));
}
if (operator === Operator.STR_CONTAINS) {
return values.some((val) => contextValue?.includes(val));
}
return false;
};
const SemverOperator = (constraint: Constraint, context: Context) => {
const { contextName, operator } = constraint;
const value = constraint.value as string;
const contextValue = resolveContextValue(context, contextName);
if (!contextValue || !isStrictSemver(contextValue)) {
return false;
}
try {
if (operator === Operator.SEMVER_EQ) {
return semverEq(contextValue, value);
}
if (operator === Operator.SEMVER_LT) {
return semverLt(contextValue, value);
}
if (operator === Operator.SEMVER_GT) {
return semverGt(contextValue, value);
}
} catch (e) {
return false;
}
return false;
};
const DateOperator = (constraint: Constraint, context: Context) => {
const { operator } = constraint;
const value = new Date(constraint.value as string);
const currentTime = context.currentTime ? new Date(context.currentTime) : new Date();
if (operator === Operator.DATE_AFTER) {
return currentTime > value;
}
if (operator === Operator.DATE_BEFORE) {
return currentTime < value;
}
return false;
};
const NumberOperator = (constraint: Constraint, context: Context) => {
const field = constraint.contextName;
const { operator } = constraint;
const value = Number(constraint.value);
const contextValue = Number(resolveContextValue(context, field));
if (Number.isNaN(value) || Number.isNaN(contextValue)) {
return false;
}
if (operator === Operator.NUM_EQ) {
return contextValue === value;
}
if (operator === Operator.NUM_GT) {
return contextValue > value;
}
if (operator === Operator.NUM_GTE) {
return contextValue >= value;
}
if (operator === Operator.NUM_LT) {
return contextValue < value;
}
if (operator === Operator.NUM_LTE) {
return contextValue <= value;
}
return false;
};
const operators = new Map<Operator, OperatorImpl>();
operators.set(Operator.IN, InOperator);
operators.set(Operator.NOT_IN, InOperator);
operators.set(Operator.STR_STARTS_WITH, StringOperator);
operators.set(Operator.STR_ENDS_WITH, StringOperator);
operators.set(Operator.STR_CONTAINS, StringOperator);
operators.set(Operator.NUM_EQ, NumberOperator);
operators.set(Operator.NUM_LT, NumberOperator);
operators.set(Operator.NUM_LTE, NumberOperator);
operators.set(Operator.NUM_GT, NumberOperator);
operators.set(Operator.NUM_GTE, NumberOperator);
operators.set(Operator.DATE_AFTER, DateOperator);
operators.set(Operator.DATE_BEFORE, DateOperator);
operators.set(Operator.SEMVER_EQ, SemverOperator);
operators.set(Operator.SEMVER_GT, SemverOperator);
operators.set(Operator.SEMVER_LT, SemverOperator);
export type StrategyResult = { enabled: true; variant?: Variant } | { enabled: false };
export class Strategy {
public name: string;
private returnValue: boolean;
constructor(name: string, returnValue: boolean = false) {
this.name = name || 'unknown';
this.returnValue = returnValue;
}
checkConstraint(constraint: Constraint, context: Context) {
const evaluator = operators.get(constraint.operator);
if (!evaluator) {
return false;
}
if (constraint.inverted) {
return !evaluator(constraint, context);
}
return evaluator(constraint, context);
}
checkConstraints(context: Context, constraints?: IterableIterator<Constraint | undefined>) {
if (!constraints) {
return true;
}
// eslint-disable-next-line no-restricted-syntax
for (const constraint of constraints) {
if (!constraint || !this.checkConstraint(constraint, context)) {
return false;
}
}
return true;
}
// eslint-disable-next-line @typescript-eslint/no-unused-vars
isEnabled(parameters: any, context: Context): boolean {
return this.returnValue;
}
isEnabledWithConstraints(
parameters: any,
context: Context,
constraints: IterableIterator<Constraint | undefined>,
) {
return this.checkConstraints(context, constraints) && this.isEnabled(parameters, context);
}
getResult(
parameters: any,
context: Context,
constraints: IterableIterator<Constraint | undefined>,
variants?: VariantDefinition[],
): StrategyResult {
const enabled = this.isEnabledWithConstraints(parameters, context, constraints);
if (enabled && Array.isArray(variants) && variants.length > 0) {
const stickiness = variants[0].stickiness || parameters.stickiness;
const variantDefinition = selectVariantDefinition(
parameters.groupId,
stickiness,
variants,
context,
);
return variantDefinition
? {
enabled: true,
variant: {
name: variantDefinition.name,
enabled: true,
payload: variantDefinition.payload,
},
}
: { enabled: true };
}
if (enabled) {
return { enabled: true };
}
return { enabled: false };
}
}