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182 changes: 182 additions & 0 deletions
182
src/v2/Artsy/Relay/middleware/cache/__tests__/Cache.jest.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,182 @@ | ||
| /** | ||
| * @jest-environment node | ||
| */ | ||
|
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| import { Cache } from "../Cache" | ||
|
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| jest.mock("lib/environment") | ||
|
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| describe("Cache", () => { | ||
| const getCache = (props = {}) => { | ||
| return new Cache({ | ||
| size: 10, | ||
| ttl: 900000, | ||
| ...props, | ||
| }) | ||
| } | ||
|
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| afterEach(() => { | ||
| jest.restoreAllMocks() | ||
| }) | ||
|
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| describe("enableServerSideCaching", () => { | ||
| it("disables if disableServerSideCache=false", () => { | ||
| const cache = getCache({ disableServerSideCache: true }) | ||
| expect(cache.enableServerSideCache).toBe(false) | ||
| }) | ||
|
|
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| it("enables if disableServerSideCache=true", () => { | ||
| const cache = getCache({ disableServerSideCache: false }) | ||
| expect(cache.enableServerSideCache).toBe(true) | ||
| }) | ||
| }) | ||
|
|
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| it("initializes a relay cache", () => { | ||
| const spy = jest.spyOn(Cache.prototype, "initRelayCache") | ||
| const cache = getCache() | ||
| expect(spy).toHaveBeenCalled() | ||
| expect(cache.relayCache).toBeTruthy() | ||
| }) | ||
|
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| it("initializes a redis cache", () => { | ||
| const spy = jest.spyOn(Cache.prototype, "initRedisCache") | ||
| const cache = getCache() | ||
| expect(spy).toHaveBeenCalled() | ||
| expect(cache.redisCache).toBeTruthy() | ||
| }) | ||
|
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| describe("redis errors", () => { | ||
| it("throws error if ECONNREFUSED", () => { | ||
| const cache = getCache() | ||
| const err = cache.handleRedisError({ | ||
| error: { | ||
| code: "ECONNREFUSED", | ||
| }, | ||
| }) as Error | ||
| expect(err.message).toContain("The server refused the connection") | ||
| }) | ||
|
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| it("throws error if retrieval time exceeds PAGE_CACHE_RETRIEVAL_TIME", () => { | ||
| process.env.PAGE_CACHE_RETRIEVAL_TIMEOUT_MS = "10" | ||
| const cache = getCache() | ||
| const err = cache.handleRedisError({ | ||
| total_retry_time: 100000, | ||
| }) as Error | ||
| expect(err.message).toContain("Retry time exhausted") | ||
| }) | ||
|
|
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| it("throws error if number of attempts exceeds MAX_RETRIES", () => { | ||
| const cache = getCache() | ||
| const err = cache.handleRedisError({ | ||
| attempt: 11, | ||
| }) as Error | ||
| expect(err.message).toContain("Retry attempts exceeded") | ||
| }) | ||
|
|
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| it("returns a retry time that backs off", () => { | ||
| const cache = getCache() | ||
| ;[...new Array(10)].forEach(index => { | ||
| const retryTime = cache.handleRedisError({ | ||
| attempt: index, | ||
| }) as Error | ||
| expect(retryTime).toEqual(index * 100) | ||
| }) | ||
| }) | ||
| }) | ||
|
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| it("returns a cache key", () => { | ||
| const cache = getCache() | ||
| expect(cache.getCacheKey("ArtistQuery", { slug: "picasso" })).toEqual( | ||
| JSON.stringify({ | ||
| queryId: "ArtistQuery", | ||
| variables: { | ||
| slug: "picasso", | ||
| }, | ||
| }) | ||
| ) | ||
| }) | ||
|
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| describe("setting and getting cache", () => { | ||
| describe("client", () => { | ||
| it("sets / gets the cache by cacheKey", async () => { | ||
| const cache = getCache() | ||
| cache.enableServerSideCache = false | ||
| const queryId = "ArtistQuery" | ||
| const variables = { slug: "picasso" } | ||
| const response = "found response" | ||
| const options = { cacheConfig: { force: false } } | ||
| cache.set(queryId, variables, [response], options) | ||
| expect(await cache.get(queryId, variables)).toEqual( | ||
| expect.objectContaining({ 0: response }) | ||
| ) | ||
| }) | ||
| }) | ||
|
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| describe("server", () => { | ||
| it("does not set cache if enableServerSideCaching=false", async () => { | ||
| const cache = getCache() | ||
| cache.enableServerSideCache = false | ||
| cache.redisCache.get = jest.fn() | ||
| const queryId = "ArtistQuery" | ||
| const variables = { slug: "picasso" } | ||
| const response = "found response" | ||
| const options = { cacheConfig: { force: false } } | ||
| cache.set(queryId, variables, [response], options) | ||
| await cache.get(queryId, variables) | ||
| expect(cache.redisCache.get).not.toHaveBeenCalled() | ||
| }) | ||
|
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| it("does not set cache if cacheConfig.force=true", async () => { | ||
| const cache = getCache() | ||
| cache.enableServerSideCache = true | ||
| cache.redisCache.get = jest.fn() | ||
| const queryId = "ArtistQuery" | ||
| const variables = { slug: "picasso" } | ||
| const response = "found response" | ||
| const options = { cacheConfig: { force: true } } | ||
| cache.set(queryId, variables, [response], options) | ||
| await cache.get(queryId, variables) | ||
| expect(cache.redisCache.get).not.toHaveBeenCalled() | ||
| }) | ||
|
|
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| it("gets / sets the cache by cacheKey", async () => { | ||
| const cache = getCache() | ||
| cache.enableServerSideCache = true | ||
| cache.relayCache.get = jest.fn() | ||
| const queryId = "ArtistQuery" | ||
| const variables = { slug: "picasso" } | ||
| const response = { foo: "bar" } | ||
| const options = { cacheConfig: { force: false } } | ||
|
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| const expireSpy = jest.fn(() => Promise.resolve()) | ||
| cache.redisCache = { | ||
| get: () => Promise.resolve(JSON.stringify(response)), | ||
| set: () => Promise.resolve(), | ||
| expire: expireSpy, | ||
| } as any | ||
|
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| cache.set(queryId, variables, [response], options) | ||
| const res = await cache.get(queryId, variables) | ||
| expect(res).toEqual(response) | ||
| expect(expireSpy).toHaveBeenCalledWith( | ||
| cache.getCacheKey(queryId, variables), | ||
| cache.cacheConfig.ttl | ||
| ) | ||
| }) | ||
| }) | ||
| }) | ||
|
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| describe("cache.clear", () => { | ||
| it("clears all caches", () => { | ||
| const cache = getCache() | ||
| cache.enableServerSideCache = true | ||
| const relaySpy = jest.fn() | ||
| cache.relayCache.clear = relaySpy | ||
| const redisSpy = jest.fn() | ||
| cache.redisCache.flushall = redisSpy | ||
| cache.clear() | ||
| expect(relaySpy).toHaveBeenCalled() | ||
| expect(redisSpy).toHaveBeenCalled() | ||
| }) | ||
| }) | ||
| }) |