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eppo-client.spec.ts
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import * as base64 from 'js-base64';
import { times } from 'lodash';
import * as td from 'testdouble';
import {
ASSIGNMENT_TEST_DATA_DIR,
getTestAssignments,
IAssignmentTestCase,
MOCK_UFC_RESPONSE_FILE,
OBFUSCATED_MOCK_UFC_RESPONSE_FILE,
readMockConfigurationWireResponse,
readMockUFCResponse,
SHARED_BOOTSTRAP_FLAGS_FILE,
SHARED_BOOTSTRAP_FLAGS_OBFUSCATED_FILE,
SubjectTestCase,
testCasesByFileName,
validateTestAssignments,
} from '../../test/testHelpers';
import { IAssignmentLogger } from '../assignment-logger';
import { AssignmentCache } from '../cache/abstract-assignment-cache';
import { IConfigurationStore } from '../configuration-store/configuration-store';
import { MemoryOnlyConfigurationStore } from '../configuration-store/memory.store';
import {
ConfigurationWireV1,
IConfigurationWire,
IObfuscatedPrecomputedConfigurationResponse,
ObfuscatedPrecomputedConfigurationResponse,
} from '../configuration-wire/configuration-wire-types';
import { MAX_EVENT_QUEUE_SIZE, DEFAULT_POLL_INTERVAL_MS, POLL_JITTER_PCT } from '../constants';
import { decodePrecomputedFlag } from '../decoding';
import { Flag, ObfuscatedFlag, VariationType, FormatEnum, Variation } from '../interfaces';
import { getMD5Hash } from '../obfuscation';
import { AttributeType } from '../types';
import EppoClient, { checkTypeMatch, FlagConfigurationRequestParameters } from './eppo-client';
import { initConfiguration } from './test-utils';
// Use a known salt to produce deterministic hashes
const salt = base64.fromUint8Array(new Uint8Array([7, 53, 17, 78]));
describe('EppoClient E2E test', () => {
global.fetch = jest.fn(() => {
const ufc = readMockUFCResponse(MOCK_UFC_RESPONSE_FILE);
return Promise.resolve({
ok: true,
status: 200,
json: () => Promise.resolve(ufc),
});
}) as jest.Mock;
const storage = new MemoryOnlyConfigurationStore<Flag | ObfuscatedFlag>();
/**
* Use this helper instead of directly setting entries on the `storage` ConfigurationStore.
* This method ensures the format field is set as it is required for parsing.
* @param entries
*/
function setUnobfuscatedFlagEntries(
entries: Record<string, Flag | ObfuscatedFlag>,
): Promise<boolean> {
storage.setFormat(FormatEnum.SERVER);
return storage.setEntries(entries);
}
beforeAll(async () => {
await initConfiguration(storage);
});
const flagKey = 'mock-flag';
const variationA = {
key: 'a',
value: 'variation-a',
};
const variationAEncoded = 'dmFyaWF0aW9uLWE=';
const variationBEncoded = 'dmFyaWF0aW9uLWI=';
const variationB = {
key: 'b',
value: 'variation-b',
};
const mockFlag: Flag = {
key: flagKey,
enabled: true,
entityId: 123,
variationType: VariationType.STRING,
variations: { a: variationA, b: variationB },
allocations: [
{
key: 'allocation-a',
rules: [],
splits: [
{
shards: [],
variationKey: 'a',
},
],
doLog: true,
},
],
totalShards: 10000,
};
describe('error encountered', () => {
let client: EppoClient;
beforeAll(async () => {
await setUnobfuscatedFlagEntries({ [flagKey]: mockFlag });
client = new EppoClient({ flagConfigurationStore: storage });
td.replace(EppoClient.prototype, 'getAssignmentDetail', function () {
throw new Error('Mock test error');
});
});
afterAll(() => {
td.reset();
});
it('returns default value when graceful failure if error encountered', async () => {
client.setIsGracefulFailureMode(true);
expect(client.getBoolAssignment(flagKey, 'subject-identifier', {}, true)).toBe(true);
expect(client.getBoolAssignment(flagKey, 'subject-identifier', {}, false)).toBe(false);
expect(client.getBooleanAssignment(flagKey, 'subject-identifier', {}, true)).toBe(true);
expect(client.getBooleanAssignment(flagKey, 'subject-identifier', {}, false)).toBe(false);
expect(client.getNumericAssignment(flagKey, 'subject-identifier', {}, 1)).toBe(1);
expect(client.getNumericAssignment(flagKey, 'subject-identifier', {}, 0)).toBe(0);
expect(client.getJSONAssignment(flagKey, 'subject-identifier', {}, {})).toEqual({});
expect(
client.getJSONAssignment(flagKey, 'subject-identifier', {}, { hello: 'world' }),
).toEqual({
hello: 'world',
});
expect(client.getStringAssignment(flagKey, 'subject-identifier', {}, 'default')).toBe(
'default',
);
});
it('throws error when graceful failure is false', async () => {
client.setIsGracefulFailureMode(false);
expect(() => {
client.getBoolAssignment(flagKey, 'subject-identifier', {}, true);
client.getBooleanAssignment(flagKey, 'subject-identifier', {}, true);
}).toThrow();
expect(() => {
client.getJSONAssignment(flagKey, 'subject-identifier', {}, {});
}).toThrow();
expect(() => {
client.getNumericAssignment(flagKey, 'subject-identifier', {}, 1);
}).toThrow();
expect(() => {
client.getStringAssignment(flagKey, 'subject-identifier', {}, 'default');
}).toThrow();
});
});
describe('setLogger', () => {
beforeAll(async () => {
await setUnobfuscatedFlagEntries({ [flagKey]: mockFlag });
});
it('Invokes logger for queued events', () => {
const mockLogger = td.object<IAssignmentLogger>();
const client = new EppoClient({ flagConfigurationStore: storage });
client.getStringAssignment(flagKey, 'subject-to-be-logged', {}, 'default-value');
client.setAssignmentLogger(mockLogger);
expect(td.explain(mockLogger.logAssignment).callCount).toEqual(1);
expect(td.explain(mockLogger.logAssignment).calls[0].args[0].subject).toEqual(
'subject-to-be-logged',
);
});
it('Does not log same queued event twice', () => {
const mockLogger = td.object<IAssignmentLogger>();
const client = new EppoClient({ flagConfigurationStore: storage });
client.getStringAssignment(flagKey, 'subject-to-be-logged', {}, 'default-value');
client.setAssignmentLogger(mockLogger);
expect(td.explain(mockLogger.logAssignment).callCount).toEqual(1);
client.setAssignmentLogger(mockLogger);
expect(td.explain(mockLogger.logAssignment).callCount).toEqual(1);
});
it('Does not invoke logger for events that exceed queue size', () => {
const mockLogger = td.object<IAssignmentLogger>();
const client = new EppoClient({ flagConfigurationStore: storage });
times(MAX_EVENT_QUEUE_SIZE + 100, (i) =>
client.getStringAssignment(flagKey, `subject-to-be-logged-${i}`, {}, 'default-value'),
);
client.setAssignmentLogger(mockLogger);
expect(td.explain(mockLogger.logAssignment).callCount).toEqual(MAX_EVENT_QUEUE_SIZE);
});
it('should log assignment event with entityId', () => {
const mockLogger = td.object<IAssignmentLogger>();
const client = new EppoClient({ flagConfigurationStore: storage });
client.setAssignmentLogger(mockLogger);
client.getStringAssignment(flagKey, 'subject-to-be-logged', {}, 'default-value');
expect(td.explain(mockLogger.logAssignment).callCount).toEqual(1);
const loggedAssignmentEvent = td.explain(mockLogger.logAssignment).calls[0].args[0];
expect(loggedAssignmentEvent.entityId).toEqual(123);
});
});
describe('check type match', () => {
it('returns false when types do not match', () => {
expect(checkTypeMatch(VariationType.JSON, VariationType.STRING)).toBe(false);
});
});
describe('precomputed flags', () => {
beforeAll(async () => {
await setUnobfuscatedFlagEntries({
[flagKey]: mockFlag,
disabledFlag: { ...mockFlag, enabled: false },
anotherFlag: {
...mockFlag,
allocations: [
{
key: 'allocation-b',
rules: [],
splits: [
{
shards: [],
variationKey: 'b',
},
],
doLog: true,
},
],
},
});
});
let client: EppoClient;
beforeEach(() => {
client = new EppoClient({ flagConfigurationStore: storage });
});
it('skips disabled flags', () => {
const encodedPrecomputedWire = client.getPrecomputedConfiguration('subject', {}, {}, salt);
const { precomputed } = JSON.parse(encodedPrecomputedWire) as IConfigurationWire;
if (!precomputed) {
fail('Precomputed data not in Configuration response');
}
const precomputedResponse = JSON.parse(
precomputed.response,
) as ObfuscatedPrecomputedConfigurationResponse;
expect(precomputedResponse).toBeTruthy();
const precomputedFlags = precomputedResponse?.flags ?? {};
expect(Object.keys(precomputedFlags)).toHaveLength(2);
expect(Object.keys(precomputedFlags)).toContain(getMD5Hash('anotherFlag', salt));
expect(Object.keys(precomputedFlags)).toContain(getMD5Hash(flagKey, salt));
expect(Object.keys(precomputedFlags)).not.toContain(getMD5Hash('disabledFlag', salt));
});
it('evaluates and returns assignments', () => {
const encodedPrecomputedWire = client.getPrecomputedConfiguration('subject', {}, {}, salt);
const { precomputed } = JSON.parse(encodedPrecomputedWire) as IConfigurationWire;
if (!precomputed) {
fail('Precomputed data not in Configuration response');
}
const precomputedResponse = JSON.parse(
precomputed.response,
) as IObfuscatedPrecomputedConfigurationResponse;
expect(precomputedResponse).toBeTruthy();
const precomputedFlags = precomputedResponse?.flags ?? {};
const firstFlag = precomputedFlags[getMD5Hash(flagKey, salt)];
const secondFlag = precomputedFlags[getMD5Hash('anotherFlag', salt)];
expect(firstFlag.variationValue).toEqual(variationAEncoded);
expect(secondFlag.variationValue).toEqual(variationBEncoded);
});
it('obfuscates assignments', () => {
const encodedPrecomputedWire = client.getPrecomputedConfiguration('subject', {}, {}, salt);
const { precomputed } = JSON.parse(encodedPrecomputedWire) as IConfigurationWire;
if (!precomputed) {
fail('Precomputed data not in Configuration response');
}
const precomputedResponse = JSON.parse(precomputed.response);
expect(precomputedResponse).toBeTruthy();
expect(precomputedResponse.salt).toEqual('BzURTg==');
const precomputedFlags = precomputedResponse?.flags ?? {};
expect(Object.keys(precomputedFlags)).toContain('61b6df4b153fdc8ee4498a008d0e40dc'); // flagKey, md5 hashed
expect(Object.keys(precomputedFlags)).toContain('23ade17a2c18c4c3b8c9f780dca19fc1'); // 'anotherFlag', md5 hashed
const decodedFirstFlag = decodePrecomputedFlag(
precomputedFlags['61b6df4b153fdc8ee4498a008d0e40dc'],
);
expect(decodedFirstFlag.flagKey).toEqual('61b6df4b153fdc8ee4498a008d0e40dc');
expect(decodedFirstFlag.variationType).toEqual(VariationType.STRING);
expect(decodedFirstFlag.variationKey).toEqual('a');
expect(decodedFirstFlag.variationValue).toEqual('variation-a');
expect(decodedFirstFlag.doLog).toEqual(true);
expect(decodedFirstFlag.extraLogging).toEqual({});
const decodedSecondFlag = decodePrecomputedFlag(
precomputedFlags['23ade17a2c18c4c3b8c9f780dca19fc1'],
);
expect(decodedSecondFlag.flagKey).toEqual('23ade17a2c18c4c3b8c9f780dca19fc1');
expect(decodedSecondFlag.variationType).toEqual(VariationType.STRING);
expect(decodedSecondFlag.variationKey).toEqual('b');
expect(decodedSecondFlag.variationValue).toEqual('variation-b');
expect(decodedSecondFlag.doLog).toEqual(true);
expect(decodedSecondFlag.extraLogging).toEqual({});
});
});
const testCases = testCasesByFileName<IAssignmentTestCase>(ASSIGNMENT_TEST_DATA_DIR);
function testCasesAgainstClient(client: EppoClient, testCase: IAssignmentTestCase) {
const { flag, variationType, defaultValue, subjects } = testCase;
let assignments: {
subject: SubjectTestCase;
assignment: string | boolean | number | null | object;
}[] = [];
const typeAssignmentFunctions = {
[VariationType.BOOLEAN]: client.getBooleanAssignment.bind(client),
[VariationType.NUMERIC]: client.getNumericAssignment.bind(client),
[VariationType.INTEGER]: client.getIntegerAssignment.bind(client),
[VariationType.STRING]: client.getStringAssignment.bind(client),
[VariationType.JSON]: client.getJSONAssignment.bind(client),
};
const assignmentFn = typeAssignmentFunctions[variationType] as (
flagKey: string,
subjectKey: string,
subjectAttributes: Record<string, AttributeType>,
defaultValue: boolean | string | number | object,
) => never;
if (!assignmentFn) {
throw new Error(`Unknown variation type: ${variationType}`);
}
assignments = getTestAssignments({ flag, variationType, defaultValue, subjects }, assignmentFn);
validateTestAssignments(assignments, flag);
}
describe('UFC Shared Test Cases', () => {
const testCases = testCasesByFileName<IAssignmentTestCase>(ASSIGNMENT_TEST_DATA_DIR);
describe('boostrapped client', () => {
const bootstrapFlagsConfig = ConfigurationWireV1.fromString(
readMockConfigurationWireResponse(SHARED_BOOTSTRAP_FLAGS_FILE),
);
const bootstrapFlagsObfuscatedConfig = ConfigurationWireV1.fromString(
readMockConfigurationWireResponse(SHARED_BOOTSTRAP_FLAGS_OBFUSCATED_FILE),
);
describe('Not obfuscated', () => {
let client: EppoClient;
beforeAll(() => {
client = new EppoClient({
flagConfigurationStore: new MemoryOnlyConfigurationStore(),
});
client.setIsGracefulFailureMode(false);
// Bootstrap using the flags config.
client.bootstrap(bootstrapFlagsConfig);
});
it('contains some key flags', () => {
const flagKeys = client.getFlagConfigurations();
expect(Object.keys(flagKeys)).toContain('numeric_flag');
expect(Object.keys(flagKeys)).toContain('kill-switch');
});
it.each(Object.keys(testCases))('test variation assignment splits - %s', (fileName) => {
testCasesAgainstClient(client, testCases[fileName]);
});
});
describe('Obfuscated', () => {
let client: EppoClient;
beforeAll(async () => {
client = new EppoClient({
flagConfigurationStore: new MemoryOnlyConfigurationStore(),
});
client.setIsGracefulFailureMode(false);
// Bootstrap using the obfuscated flags config.
await client.bootstrap(bootstrapFlagsObfuscatedConfig);
});
it('contains some key flags', () => {
const flagKeys = client.getFlagConfigurations();
expect(Object.keys(flagKeys)).toContain('73fcc84c69e49e31fe16a29b2b1f803b');
expect(Object.keys(flagKeys)).toContain('69d2ea567a75b7b2da9648bf312dc3a5');
});
it.each(Object.keys(testCases))('test variation assignment splits - %s', (fileName) => {
testCasesAgainstClient(client, testCases[fileName]);
});
});
});
describe('traditional client', () => {
describe('Not obfuscated', () => {
beforeAll(async () => {
global.fetch = jest.fn(() => {
return Promise.resolve({
ok: true,
status: 200,
json: () => Promise.resolve(readMockUFCResponse(MOCK_UFC_RESPONSE_FILE)),
});
}) as jest.Mock;
await initConfiguration(storage);
});
afterAll(() => {
jest.restoreAllMocks();
});
it.each(Object.keys(testCases))(
'test variation assignment splits - %s',
async (fileName) => {
const client = new EppoClient({ flagConfigurationStore: storage });
client.setIsGracefulFailureMode(false);
testCasesAgainstClient(client, testCases[fileName]);
},
);
});
describe('Obfuscated', () => {
beforeAll(async () => {
global.fetch = jest.fn(() => {
return Promise.resolve({
ok: true,
status: 200,
json: () => Promise.resolve(readMockUFCResponse(OBFUSCATED_MOCK_UFC_RESPONSE_FILE)),
});
}) as jest.Mock;
await initConfiguration(storage);
});
afterAll(() => {
jest.restoreAllMocks();
});
it.each(Object.keys(testCases))(
'test variation assignment splits - %s',
async (fileName) => {
const { flag, variationType, defaultValue, subjects } = testCases[fileName];
const client = new EppoClient({ flagConfigurationStore: storage, isObfuscated: true });
client.setIsGracefulFailureMode(false);
const typeAssignmentFunctions = {
[VariationType.BOOLEAN]: client.getBooleanAssignment.bind(client),
[VariationType.NUMERIC]: client.getNumericAssignment.bind(client),
[VariationType.INTEGER]: client.getIntegerAssignment.bind(client),
[VariationType.STRING]: client.getStringAssignment.bind(client),
[VariationType.JSON]: client.getJSONAssignment.bind(client),
};
const assignmentFn = typeAssignmentFunctions[variationType] as (
flagKey: string,
subjectKey: string,
subjectAttributes: Record<string, AttributeType>,
defaultValue: boolean | string | number | object,
) => never;
if (!assignmentFn) {
throw new Error(`Unknown variation type: ${variationType}`);
}
const assignments = getTestAssignments(
{ flag, variationType, defaultValue, subjects },
assignmentFn,
);
validateTestAssignments(assignments, flag);
},
);
});
});
});
it('returns null if getStringAssignment was called for the subject before any UFC was loaded', () => {
const localClient = new EppoClient({
flagConfigurationStore: new MemoryOnlyConfigurationStore(),
});
expect(localClient.getStringAssignment(flagKey, 'subject-1', {}, 'hello world')).toEqual(
'hello world',
);
expect(localClient.isInitialized()).toBe(false);
});
it('returns default value when key does not exist', async () => {
const client = new EppoClient({ flagConfigurationStore: storage });
const nonExistentFlag = 'non-existent-flag';
expect(client.getBoolAssignment(nonExistentFlag, 'subject-identifier', {}, true)).toBe(true);
expect(client.getBooleanAssignment(nonExistentFlag, 'subject-identifier', {}, true)).toBe(true);
expect(client.getNumericAssignment(nonExistentFlag, 'subject-identifier', {}, 1)).toBe(1);
expect(client.getJSONAssignment(nonExistentFlag, 'subject-identifier', {}, {})).toEqual({});
expect(client.getStringAssignment(nonExistentFlag, 'subject-identifier', {}, 'default')).toBe(
'default',
);
});
it('logs variation assignment and experiment key', async () => {
const mockLogger = td.object<IAssignmentLogger>();
await setUnobfuscatedFlagEntries({ [flagKey]: mockFlag });
const client = new EppoClient({ flagConfigurationStore: storage });
client.setAssignmentLogger(mockLogger);
const subjectAttributes = { foo: 3 };
const assignment = client.getStringAssignment(
flagKey,
'subject-10',
subjectAttributes,
'default',
);
expect(assignment).toEqual(variationA.value);
expect(td.explain(mockLogger.logAssignment).callCount).toEqual(1);
const loggedAssignmentEvent = td.explain(mockLogger.logAssignment).calls[0].args[0];
expect(loggedAssignmentEvent.subject).toEqual('subject-10');
expect(loggedAssignmentEvent.featureFlag).toEqual(flagKey);
expect(loggedAssignmentEvent.experiment).toEqual(`${flagKey}-${mockFlag.allocations[0].key}`);
expect(loggedAssignmentEvent.allocation).toEqual(mockFlag.allocations[0].key);
});
it('handles logging exception', async () => {
const mockLogger = td.object<IAssignmentLogger>();
td.when(mockLogger.logAssignment(td.matchers.anything())).thenThrow(new Error('logging error'));
await setUnobfuscatedFlagEntries({ [flagKey]: mockFlag });
const client = new EppoClient({ flagConfigurationStore: storage });
client.setAssignmentLogger(mockLogger);
const subjectAttributes = { foo: 3 };
const assignment = client.getStringAssignment(
flagKey,
'subject-10',
subjectAttributes,
'default',
);
expect(assignment).toEqual('variation-a');
});
it('exports flag configuration', async () => {
await setUnobfuscatedFlagEntries({ [flagKey]: mockFlag });
const client = new EppoClient({ flagConfigurationStore: storage });
expect(client.getFlagConfigurations()).toEqual({ [flagKey]: mockFlag });
});
describe('assignment logging deduplication', () => {
let client: EppoClient;
let mockLogger: IAssignmentLogger;
beforeEach(async () => {
mockLogger = td.object<IAssignmentLogger>();
await setUnobfuscatedFlagEntries({ [flagKey]: mockFlag });
client = new EppoClient({ flagConfigurationStore: storage });
client.setAssignmentLogger(mockLogger);
});
it('logs duplicate assignments without an assignment cache', async () => {
client.disableAssignmentCache();
client.getStringAssignment(flagKey, 'subject-10', {}, 'default');
client.getStringAssignment(flagKey, 'subject-10', {}, 'default');
// call count should be 2 because there is no cache.
expect(td.explain(mockLogger.logAssignment).callCount).toEqual(2);
});
it('does not log duplicate assignments', async () => {
client.useNonExpiringInMemoryAssignmentCache();
client.getStringAssignment(flagKey, 'subject-10', {}, 'default');
client.getStringAssignment(flagKey, 'subject-10', {}, 'default');
// call count should be 1 because the second call is a cache hit and not logged.
expect(td.explain(mockLogger.logAssignment).callCount).toEqual(1);
});
it('logs assignment again after the lru cache is full', () => {
client.useLRUInMemoryAssignmentCache(2);
client.getStringAssignment(flagKey, 'subject-10', {}, 'default'); // logged
client.getStringAssignment(flagKey, 'subject-10', {}, 'default'); // cached
client.getStringAssignment(flagKey, 'subject-11', {}, 'default'); // logged
client.getStringAssignment(flagKey, 'subject-11', {}, 'default'); // cached
client.getStringAssignment(flagKey, 'subject-12', {}, 'default'); // cache evicted subject-10, logged
client.getStringAssignment(flagKey, 'subject-10', {}, 'default'); // previously evicted, logged
client.getStringAssignment(flagKey, 'subject-12', {}, 'default'); // cached
expect(td.explain(mockLogger.logAssignment).callCount).toEqual(4);
});
it('does not cache assignments if the logger had an exception', () => {
td.when(mockLogger.logAssignment(td.matchers.anything())).thenThrow(
new Error('logging error'),
);
client.setAssignmentLogger(mockLogger);
client.getStringAssignment(flagKey, 'subject-10', {}, 'default');
client.getStringAssignment(flagKey, 'subject-10', {}, 'default');
// call count should be 2 because the first call had an exception
// therefore we are not sure the logger was successful and try again.
expect(td.explain(mockLogger.logAssignment).callCount).toEqual(2);
});
it('logs for each unique flag', async () => {
await setUnobfuscatedFlagEntries({
[flagKey]: mockFlag,
'flag-2': {
...mockFlag,
key: 'flag-2',
},
'flag-3': {
...mockFlag,
key: 'flag-3',
},
});
client.useNonExpiringInMemoryAssignmentCache();
client.getStringAssignment(flagKey, 'subject-10', {}, 'default');
client.getStringAssignment(flagKey, 'subject-10', {}, 'default');
client.getStringAssignment('flag-2', 'subject-10', {}, 'default');
client.getStringAssignment('flag-2', 'subject-10', {}, 'default');
client.getStringAssignment('flag-3', 'subject-10', {}, 'default');
client.getStringAssignment('flag-3', 'subject-10', {}, 'default');
client.getStringAssignment(flagKey, 'subject-10', {}, 'default');
client.getStringAssignment('flag-2', 'subject-10', {}, 'default');
client.getStringAssignment('flag-3', 'subject-10', {}, 'default');
expect(td.explain(mockLogger.logAssignment).callCount).toEqual(3);
});
it('logs twice for the same flag when allocations change', async () => {
client.useNonExpiringInMemoryAssignmentCache();
await setUnobfuscatedFlagEntries({
[flagKey]: {
...mockFlag,
allocations: [
{
key: 'allocation-a-2',
rules: [],
splits: [
{
shards: [],
variationKey: 'a',
},
],
doLog: true,
},
],
},
});
client.getStringAssignment(flagKey, 'subject-10', {}, 'default');
await setUnobfuscatedFlagEntries({
[flagKey]: {
...mockFlag,
allocations: [
{
key: 'allocation-a-3',
rules: [],
splits: [
{
shards: [],
variationKey: 'a',
},
],
doLog: true,
},
],
},
});
client.getStringAssignment(flagKey, 'subject-10', {}, 'default');
expect(td.explain(mockLogger.logAssignment).callCount).toEqual(2);
});
it('logs the same subject/flag/variation after two changes', async () => {
client.useNonExpiringInMemoryAssignmentCache();
// original configuration version
await setUnobfuscatedFlagEntries({ [flagKey]: mockFlag });
client.getStringAssignment(flagKey, 'subject-10', {}, 'default'); // log this assignment
client.getStringAssignment(flagKey, 'subject-10', {}, 'default'); // cache hit, don't log
// change the variation
await setUnobfuscatedFlagEntries({
[flagKey]: {
...mockFlag,
allocations: [
{
key: 'allocation-a', // note: same key
rules: [],
splits: [
{
shards: [],
variationKey: 'b', // but different variation!
},
],
doLog: true,
},
],
},
});
client.getStringAssignment(flagKey, 'subject-10', {}, 'default'); // log this assignment
client.getStringAssignment(flagKey, 'subject-10', {}, 'default'); // cache hit, don't log
// change the flag again, back to the original
await setUnobfuscatedFlagEntries({ [flagKey]: mockFlag });
client.getStringAssignment(flagKey, 'subject-10', {}, 'default'); // important: log this assignment
client.getStringAssignment(flagKey, 'subject-10', {}, 'default'); // cache hit, don't log
// change the allocation
await setUnobfuscatedFlagEntries({
[flagKey]: {
...mockFlag,
allocations: [
{
key: 'allocation-b', // note: different key
rules: [],
splits: [
{
shards: [],
variationKey: 'b', // variation has been seen before
},
],
doLog: true,
},
],
},
});
client.getStringAssignment(flagKey, 'subject-10', {}, 'default'); // log this assignment
client.getStringAssignment(flagKey, 'subject-10', {}, 'default'); // cache hit, don't log
expect(td.explain(mockLogger.logAssignment).callCount).toEqual(4);
});
});
describe('Eppo Client constructed with configuration request parameters', () => {
let client: EppoClient;
let thisFlagStorage: IConfigurationStore<Flag | ObfuscatedFlag>;
let requestConfiguration: FlagConfigurationRequestParameters;
const flagKey = 'numeric_flag';
const subject = 'alice';
const pi = 3.1415926;
const maxRetryDelay = DEFAULT_POLL_INTERVAL_MS * POLL_JITTER_PCT;
beforeAll(async () => {
global.fetch = jest.fn(() => {
return Promise.resolve({
ok: true,
status: 200,
json: () => Promise.resolve(readMockUFCResponse(MOCK_UFC_RESPONSE_FILE)),
});
}) as jest.Mock;
});
beforeEach(async () => {
requestConfiguration = {
apiKey: 'dummy key',
sdkName: 'js-client-sdk-common',
sdkVersion: '1.0.0',
};
thisFlagStorage = new MemoryOnlyConfigurationStore();
// We only want to fake setTimeout() and clearTimeout()
jest.useFakeTimers({
advanceTimers: true,
doNotFake: [
'Date',
'hrtime',
'nextTick',
'performance',
'queueMicrotask',
'requestAnimationFrame',
'cancelAnimationFrame',
'requestIdleCallback',
'cancelIdleCallback',
'setImmediate',
'clearImmediate',
'setInterval',
'clearInterval',
],
});
});
afterEach(() => {
jest.clearAllTimers();
jest.useRealTimers();
});
afterAll(() => {
jest.restoreAllMocks();
});
it('Fetches initial configuration with parameters in constructor', async () => {
client = new EppoClient({
flagConfigurationStore: thisFlagStorage,
configurationRequestParameters: requestConfiguration,
});
client.setIsGracefulFailureMode(false);
// no configuration loaded
let variation = client.getNumericAssignment(flagKey, subject, {}, 123.4);
expect(variation).toBe(123.4);
// have client fetch configurations
await client.fetchFlagConfigurations();
variation = client.getNumericAssignment(flagKey, subject, {}, 0.0);
expect(variation).toBe(pi);
});
it('Fetches initial configuration with parameters provided later', async () => {
client = new EppoClient({ flagConfigurationStore: thisFlagStorage });
client.setIsGracefulFailureMode(false);
client.setConfigurationRequestParameters(requestConfiguration);
// no configuration loaded
let variation = client.getNumericAssignment(flagKey, subject, {}, 0.0);
expect(variation).toBe(0.0);
// have client fetch configurations
await client.fetchFlagConfigurations();
variation = client.getNumericAssignment(flagKey, subject, {}, 0.0);
expect(variation).toBe(pi);
});
describe('Poll after successful start', () => {
it('Continues to poll when cache has not expired', async () => {
class MockStore<T> extends MemoryOnlyConfigurationStore<T> {
public static expired = false;
async isExpired(): Promise<boolean> {
return MockStore.expired;
}
}
client = new EppoClient({
flagConfigurationStore: new MockStore(),
configurationRequestParameters: {
...requestConfiguration,
pollAfterSuccessfulInitialization: true,
},
});
client.setIsGracefulFailureMode(false);
// no configuration loaded
let variation = client.getNumericAssignment(flagKey, subject, {}, 0.0);
expect(variation).toBe(0.0);
// have client fetch configurations; cache is not expired so assignment stays
await client.fetchFlagConfigurations();
variation = client.getNumericAssignment(flagKey, subject, {}, 0.0);
expect(variation).toBe(0.0);
// Expire the cache and advance time until a reload should happen
MockStore.expired = true;
await jest.advanceTimersByTimeAsync(DEFAULT_POLL_INTERVAL_MS * 1.5);
variation = client.getNumericAssignment(flagKey, subject, {}, 0.0);
expect(variation).toBe(pi);
});
});
it('Does not fetch configurations if the configuration store is unexpired', async () => {
class MockStore<T> extends MemoryOnlyConfigurationStore<T> {
async isExpired(): Promise<boolean> {
return false;
}
}
client = new EppoClient({
flagConfigurationStore: new MockStore(),
configurationRequestParameters: requestConfiguration,
});
client.setIsGracefulFailureMode(false);
// no configuration loaded
let variation = client.getNumericAssignment(flagKey, subject, {}, 0.0);
expect(variation).toBe(0.0);
// have client fetch configurations
await client.fetchFlagConfigurations();
variation = client.getNumericAssignment(flagKey, subject, {}, 0.0);
expect(variation).toBe(0.0);
});
it.each([
{ pollAfterSuccessfulInitialization: false },
{ pollAfterSuccessfulInitialization: true },
])('retries initial configuration request with config %p', async (configModification) => {
let callCount = 0;
global.fetch = jest.fn(() => {
if (++callCount === 1) {
// Simulate an error for the first call
return Promise.resolve({
ok: false,
status: 500,
json: () => Promise.reject(new Error('Server error')),
});
} else {
// Return a successful response for subsequent calls
return Promise.resolve({
ok: true,
status: 200,
json: () => {
return readMockUFCResponse(MOCK_UFC_RESPONSE_FILE);
},
});
}
}) as jest.Mock;
const { pollAfterSuccessfulInitialization } = configModification;
requestConfiguration = {
...requestConfiguration,
pollAfterSuccessfulInitialization,
};
client = new EppoClient({
flagConfigurationStore: thisFlagStorage,
configurationRequestParameters: requestConfiguration,
});
client.setIsGracefulFailureMode(false);
// no configuration loaded
let variation = client.getNumericAssignment(flagKey, subject, {}, 0.0);
expect(variation).toBe(0.0);
// By not awaiting (yet) only the first attempt should be fired off before test execution below resumes
const fetchPromise = client.fetchFlagConfigurations();
// Advance timers mid-init to allow retrying
await jest.advanceTimersByTimeAsync(maxRetryDelay);
// Await so it can finish its initialization before this test proceeds
await fetchPromise;
variation = client.getNumericAssignment(flagKey, subject, {}, 0.0);
expect(variation).toBe(pi);
expect(callCount).toBe(2);
await jest.advanceTimersByTimeAsync(DEFAULT_POLL_INTERVAL_MS);
// By default, no more polling
expect(callCount).toBe(pollAfterSuccessfulInitialization ? 3 : 2);
});
it.each([
{
pollAfterFailedInitialization: false,
throwOnFailedInitialization: false,
},
{ pollAfterFailedInitialization: false, throwOnFailedInitialization: true },
{ pollAfterFailedInitialization: true, throwOnFailedInitialization: false },
{ pollAfterFailedInitialization: true, throwOnFailedInitialization: true },
])('initial configuration request fails with config %p', async (configModification) => {
let callCount = 0;
global.fetch = jest.fn(() => {
if (++callCount === 1) {
// Simulate an error for the first call
return Promise.resolve({
ok: false,
status: 500,
json: () => Promise.reject(new Error('Server error')),
} as Response);
} else {
// Return a successful response for subsequent calls
return Promise.resolve({
ok: true,
status: 200,
json: () => Promise.resolve(readMockUFCResponse(MOCK_UFC_RESPONSE_FILE)),