feat: Upgrade event callbacks into EventEmitter
#16
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Actionable comments posted: 11
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- README.md (2 hunks)
- package.json (1 hunks)
- src/run-cache.test.ts (9 hunks)
- src/run-cache.ts (9 hunks)
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GitHub Check: build
src/run-cache.ts
[failure] 1-1:
Cannot find module 'events' or its corresponding type declarations.
[failure] 11-11:
Cannot find namespace 'NodeJS'.
[failure] 84-84:
Cannot find namespace 'NodeJS'.
Biome
src/run-cache.ts
[error] 1-1: A Node.js builtin module should be imported with the node: protocol.
Using the node: protocol is more explicit and signals that the imported module belongs to Node.js.
Unsafe fix: Add the node: protocol.(lint/style/useNodejsImportProtocol)
[error] 91-91: Using this in a static context can be confusing.
this refers to the class.
Unsafe fix: Use the class name instead.(lint/complexity/noThisInStatic)
[error] 96-96: Forbidden non-null assertion.
(lint/style/noNonNullAssertion)
[error] 119-119: Forbidden non-null assertion.
(lint/style/noNonNullAssertion)
Additional comments not posted (11)
package.json (2)
32-32: Addition of '@types/uuid' enhances TypeScript supportThe inclusion of
@types/uuidindevDependenciesis appropriate, as it provides type definitions for theuuidpackage, enhancing type safety during development.
35-35: Including 'tsx' in devDependencies is appropriateThe addition of
tsxallows for efficient execution of TypeScript files during development. This inclusion is suitable if it supports your development workflow.src/run-cache.test.ts (9)
2-2: Importuuidfor unique test keysThe addition of
import { v4 as uuid } from "uuid";allows the tests to generate unique keys and values, enhancing test isolation and reliability.
10-11: Initialize fake timers in testsUsing
jest.useFakeTimers();in thebeforeEachblock ensures that all tests have consistent and controlled timing environments, which is crucial for testing time-dependent functionality like cache expiration.
15-21: Proper cleanup of timers and event listenersThe
afterEachblock correctly resets the timer mechanisms withjest.clearAllTimers();andjest.useRealTimers();. Clearing event listeners withRunCache.clearEventListeners();prevents tests from affecting each other due to lingering listeners.
104-106: Efficient TTL testing withjest.advanceTimersByTime()Replacing
sleep()withjest.advanceTimersByTime(101);enhances test performance by eliminating unnecessary delays and provides more precise control over the simulated passage of time.
122-132: Consistent use of mocked source functionsMocking
sourceFnwithjest.fn(() => "value1");and verifying the returned value ensures that the cache retrieval logic is functioning as expected.
155-155: Advancing timers to test auto refetchUsing
jest.advanceTimersByTime(101);effectively simulates the TTL expiry, allowing the test to confirm thatautoRefetchtriggers the source function as intended.
201-204: Verifying cache expiration withjest.advanceTimersByTime()Advancing timers by the TTL value ensures that the
has()method correctly reflects the cache's state after expiration.
286-317: Comprehensive testing of expiration eventsThe new tests for
onExpire()andonKeyExpiry()correctly verify that the appropriate callbacks are triggered upon cache expiration. Registering the same function for both events and checking that it's called twice confirms the event mechanisms are working as expected.
319-352: Thorough testing of refetch eventsThe tests for
onRefetch()andonKeyRefetch()ensure that refetching triggers the correct callbacks and updates the cache value appropriately. Verifying that thesourceFnand event handlers are called the expected number of times strengthens confidence in the cache's refetch functionality.
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Actionable comments posted: 6
Outside diff range comments (1)
.github/workflows/build.yml (1)
Line range hint
1-28: Consider adding a caching step to improve build performance.To speed up the build process, you can leverage GitHub Actions caching to store and retrieve the
node_modulesdirectory between builds. This can significantly reduce the time spent installing dependencies, especially for larger projects.Here's how you can add caching:
- name: Setup Node.js uses: actions/setup-node@v3 with: node-version: "18" registry-url: "https://registry.npmjs.org" + - name: Cache node modules + uses: actions/cache@v3 + env: + cache-name: cache-node-modules + with: + path: ~/.npm + key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }} + restore-keys: | + ${{ runner.os }}-build-${{ env.cache-name }}- + ${{ runner.os }}-build- + ${{ runner.os }}- + - name: Install dependencies run: npm ciThis configuration uses the
actions/cacheaction to cache the~/.npmdirectory, which is wherenpm ciinstalls packages. The cache key is generated based on the runner's OS, a cache name, and thepackage-lock.jsonfile hash. This ensures that a new cache is created whenever the dependencies change.
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- .github/workflows/build.yml (1 hunks)
- .vscode/settings.json (1 hunks)
- README.md (5 hunks)
- package.json (2 hunks)
- src/run-cache.test.ts (4 hunks)
- src/run-cache.ts (9 hunks)
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Learnings (1)
package.json (1)
Learnt from: helloscoopa PR: helloscoopa/run-cache#16 File: package.json:36-36 Timestamp: 2024-09-19T01:41:52.690Z Learning: In the 'run-cache' project, the `uuid` package is only used in tests.
LanguageTool
README.md
[uncategorized] ~135-~135: You might be missing the article “the” here.
Context: ...s RunCache.deleteAll();#### Check existence of a specific cachets // Returns a...(AI_EN_LECTOR_MISSING_DETERMINER_THE)
Biome
src/run-cache.ts
[error] 419-419: Forbidden non-null assertion.
(lint/style/noNonNullAssertion)
[error] 425-425: Forbidden non-null assertion.
(lint/style/noNonNullAssertion)
Additional comments not posted (58)
.vscode/settings.json (1)
2-2: LGTM!The addition of "refetches" to the
cSpell.wordsarray is appropriate and consistent with the existing entries. This change will prevent the spell checker from flagging "refetches" as a misspelled word..github/workflows/build.yml (1)
22-23: LGTM! The new step ensures a clean and consistent build environment.Adding the "Install dependencies" step with
npm ciis a great practice for CI workflows. It guarantees that the exact versions specified in the lockfile are installed, providing a reliable and reproducible build environment. This step helps prevent issues caused by inconsistent or outdated dependencies.package.json (3)
3-3: LGTM!The version bump to 1.4.0 is appropriate for the new features and enhancements introduced in this pull request.
4-4: Excellent update to the description!The addition of "dependency-free" to the description effectively communicates the lightweight nature of the library. This information is valuable for developers considering using the library in their projects.
32-33: Great additions to improve TypeScript support!The inclusion of
@types/nodeand@types/uuidas development dependencies enhances the TypeScript development experience by providing type definitions for Node.js and theuuidlibrary, respectively. This change promotes type safety and improves the overall developer experience when working with the library.README.md (4)
8-8: Excellent improvement in the library description!The change from "dependency nil" to "dependency-free" enhances clarity and aligns with standard terminology.
76-84: Great addition of event listeners for cache expiry!The new
onExpirymethod provides a convenient way to handle cache expiration events. The examples clearly demonstrate how to set up listeners for all expiries or for specific keys.
91-98: Useful introduction of event listeners for cache refetching!Similar to the
onExpirymethod, the newonRefetchandonKeyRefetchmethods enable developers to execute custom logic when cache entries are refetched. The examples effectively illustrate their usage.
142-165: Valuable addition of theclearEventListenersmethod!Introducing the ability to remove event listeners is a thoughtful feature. It allows developers to manage memory and control the lifecycle of listeners. The examples cover different scenarios, such as clearing all listeners, specific event listeners, or listeners for a specific key.
src/run-cache.ts (22)
1-1: LGTM!The import statement correctly uses the 'node:' protocol to import the
EventEmitterfrom the Node.js built-in 'events' module.
11-11: ****The previous comment about resolving the
NodeJSnamespace is still valid. Please install the Node.js type definitions or adjust the type to avoid relying on theNodeJSnamespace.
22-24: LGTM!The
EmitParamtype is correctly defined using thePickutility type to select specific properties from theCacheStatetype and merge them with thekeyproperty.
26-27: LGTM!The
SourceFnandEventFntypes are correctly defined to allow returning either a promise or a synchronous value.
31-32: LGTM!The
emitterproperty is correctly defined as a private static property of typeEventEmitter.
72-73: LGTM!The error handling for empty keys is correctly implemented using optional chaining and throwing an error with a clear message.
76-77: LGTM!The error handling for missing
valueandsourceFnis correctly implemented by throwing an error with a clear message.
80-81: LGTM!The error handling for
autoRefetchwithoutttlis correctly implemented by throwing an error with a clear message.
85-103: LGTM!The timeout logic is correctly implemented using
setTimeoutand clearing the timeout when the cache entry is deleted or all entries are cleared.
105-113: LGTM!The logic for fetching the value from the
sourceFnwhenvalueis not provided is correctly implemented using a try-catch block and throwing an error with a clear message if thesourceFnfails.
Line range hint
116-124: LGTM!The cache entry is correctly set with the required properties, including the
timeoutproperty.
168-175: LGTM!The
refetchevent is correctly emitted using theemitEventmethod with the required properties.
206-208: LGTM!The
isExpiredmethod is correctly used to check if the cache entry has expired before returning the value.
210-216: LGTM!The
expireevent is correctly emitted using theemitEventmethod with the required properties when the cache entry has expired.
235-240: LGTM!The timeout is correctly cleared using
clearTimeoutwhen the cache entry is deleted.
251-257: LGTM!The timeouts for all cache entries are correctly cleared using
clearTimeoutwhen all entries are deleted.
275-282: LGTM!The
expireevent is correctly emitted using theemitEventmethod with the required properties when the cache entry has expired in thehasmethod.
290-300: LGTM!The
emitEventmethod is correctly implemented to emit events for both the global event and the event with the key.
302-314: LGTM!The
onExpirymethod is correctly implemented to register a callback function for the globalexpireevent.
316-334: LGTM!The
onKeyExpirymethod is correctly implemented to register a callback function for theexpireevent with a specific key, including error handling for empty keys and storing the event ID.
336-348: LGTM!The
onRefetchmethod is correctly implemented to register a callback function for the globalrefetchevent.
350-368: LGTM!The
onKeyRefetchmethod is correctly implemented to register a callback function for therefetchevent with a specific key, including error handling for empty keys and storing the event ID.src/run-cache.test.ts (27)
10-11: LGTM!The usage of Jest's fake timers and clearing them after each test is a good practice to ensure test isolation and prevent unexpected behavior.
Also applies to: 15-20
43-44: Prefer using a static value for the key.As mentioned in the previous comment, consider using a static value for the key to improve readability:
- const key = uuid(); + const key = "someKey";
75-78: Prefer using static values for the key, value, and source function.As mentioned in the previous comments, consider using static values for the key, value, and source function to improve readability:
- const key = uuid(); - const value = uuid(); + const key = "someKey"; + const value = "someValue"; - const sourceFn = jest.fn(() => value); + const sourceFn = jest.fn(() => "someValue");
90-93: Prefer using static values for the key, value, and source function.As mentioned in the previous comments, consider using static values for the key, value, and source function to improve readability:
- const key = uuid(); - const value = uuid(); + const key = "someKey"; + const value = "someValue"; - const sourceFn = jest.fn(() => value); + const sourceFn = jest.fn(() => "someValue");
107-109: LGTM!The test case is correctly asserting the return value of the
set()method when the cache value is set successfully.
113-114: Prefer using static values for the key and value.As mentioned in the previous comments, consider using static values for the key and value to improve readability:
- const key = uuid(); - const value = uuid(); + const key = "someKey"; + const value = "someValue";
116-117: LGTM!The test case is correctly asserting the behavior of the
set()method with a TTL and verifying that the TTL is functioning properly by advancing the timers and checking the value after expiry.Also applies to: 119-121
131-131: Prefer using a static value for the key.As mentioned in the previous comments, consider using a static value for the key to improve readability:
- expect(await RunCache.get(uuid())).toBeUndefined(); + expect(await RunCache.get("nonExistentKey")).toBeUndefined();
135-138: Prefer using static values for the key and value.As mentioned in the previous comments, consider using static values for the key and value to improve readability:
- const key = uuid(); - const value = uuid(); + const key = "someKey"; + const value = "someValue"; - const sourceFn = jest.fn(() => value); + const sourceFn = jest.fn(() => "someValue");
166-168: LGTM!The test case is correctly asserting the auto-refetch behavior by updating the dynamic value, advancing the timers, and verifying that the cache returns the updated value after the refetch.
Also applies to: 170-170, 172-172, 174-176
182-186: Prefer using static values for the key and value.As mentioned in the previous comments, consider using static values for the key and value to improve readability:
- const key = uuid(); - const value = uuid(); + const key = "someKey"; + const value = "someValue"; - RunCache.set({ key, value }); + RunCache.set({ key: "someKey", value: "someValue" });
192-192: LGTM!The test case is correctly asserting that the
delete()method returnsfalsewhen the operation fails due to a non-existent key.
196-201: Prefer using static values for the key and value.As mentioned in the previous comments, consider using static values for the key and value to improve readability:
- const key = uuid(); - const value = uuid(); + const key = "someKey"; + const value = "someValue"; - RunCache.set({ key, value }); + RunCache.set({ key: "someKey", value: "someValue" });
207-213: Prefer using static values for the keys and values.As mentioned in the previous comments, consider using static values for the keys and values to improve readability:
- const key1 = uuid(); - const key2 = uuid(); - const value1 = uuid(); - const value2 = uuid(); + const key1 = "someKey1"; + const key2 = "someKey2"; + const value1 = "someValue1"; + const value2 = "someValue2"; - RunCache.set({ key: key1, value: value1 }); - RunCache.set({ key: key2, value: value2 }); + RunCache.set({ key: "someKey1", value: "someValue1" }); + RunCache.set({ key: "someKey2", value: "someValue2" });Also applies to: 215-216
222-226: Prefer using static values for the key and value.As mentioned in the previous comments, consider using static values for the key and value to improve readability:
- const key = uuid(); - const value = uuid(); + const key = "someKey"; + const value = "someValue"; - RunCache.set({ key, value }); + RunCache.set({ key: "someKey", value: "someValue" });
230-230: LGTM!The test case is correctly asserting that the
has()method returnsfalsewhen the key does not exist in the cache.
234-235: Prefer using static values for the key and value.As mentioned in the previous comments, consider using static values for the key and value to improve readability:
- const key = uuid(); - const value = uuid(); + const key = "someKey"; + const value = "someValue"; - RunCache.set({ key, value, ttl: 100 }); + RunCache.set({ key: "someKey", value: "someValue", ttl: 100 });Also applies to: 237-238, 240-240, 242-242
248-250: Prefer using static values for the key and value.As mentioned in the previous comments, consider using static values for the key and value to improve readability:
- const key = uuid(); + const key = "someKey"; - RunCache.set({ key, value: uuid() }); + RunCache.set({ key: "someKey", value: "someValue" });
Line range hint
257-267: LGTM!The test case is correctly asserting that the
refetch()method throws an error when the source function throws an error. The use of a flag to control the error throwing behavior is a good approach to test this scenario.
282-284: LGTM!The test case is correctly asserting that the
refetch()method returnsfalsewhen the key does not exist in the cache.
313-315: LGTM!The test case is correctly asserting that the
refetch()method updates the cache value from the source function when called. The use of a dynamic value and updating it before the refetch is a good approach to test this scenario.Also applies to: 317-320, 324-324, 326-326, 330-332
337-338: LGTM!The test case is correctly asserting that the
onExpiry()andonKeyExpiry()methods trigger the registered callbacks after the TTL expiry. The use of fake timers and advancing them to simulate the expiry is a good approach to test this scenario.Also applies to: 340-341, 343-347, 351-352, 354-358, 360-361, 363-363
368-369: LGTM!The test case is correctly asserting that the
onRefetch()andonKeyRefetch()methods trigger the registered callbacks on refetch. The use of fake timers and advancing them to simulate the refetch is a good approach to test this scenario.Also applies to: 371-373, 375-379, 381-381, 383-384, 387-390, 393-393, 395-397, 399-400
405-406: LGTM!The test case is correctly asserting that the
clearEventListeners()method cancels all existing listeners when called without any arguments. The use of fake timers and advancing them to simulate the expiry and refetch is a good approach to test this scenario.Also applies to: 408-409, 411-411, 413-414, 416-417, 419-424, 426-427, 429-430, 432-433
437-438: LGTM!The test case is correctly asserting that the
clearEventListeners()method cancels existing listeners for a specific event when called with theeventargument. The use of fake timers and advancing them to simulate the expiry and refetch is a good approach to test this scenario.Also applies to: 440-441, 443-443, 445-446, 448-449, 451-456, 458-459, 461-462, 464-466
469-470: LGTM!The test case is correctly asserting that the
clearEventListeners()method cancels existing listeners for a specific event and key when called with theeventandkeyarguments. The use of fake timers and advancing them to simulate the expiry and refetch is a good approach to test this scenario.Also applies to: 472-473, 475-475, 477-478, 480-481, 483-486, 489-494, 496-497, 500-501
288-289: Verify the concurrent refetch behavior in the codebase.The test case is correctly asserting that the
refetch()method does not call the source function more than once at a time when multiple concurrent refetch requests are made. However, it's important to verify that this behavior is consistent throughout the codebase.Run the following script to verify the concurrent refetch behavior:
Also applies to: 290-290, 293-294, 297-297, 300-302, 305-307
Verification successful
To properly verify the concurrent refetch behavior in the codebase, we need to adjust our approach. Let's use a combination of ast-grep and ripgrep to search for potential issues with concurrent
RunCache.refetch()calls.This script will help us identify the usage of
RunCache.refetch()and potential cases where multiple calls might occur concurrently. Once we have the results, we can analyze them to determine if there are any concerning patterns or if the behavior is consistent throughout the codebase.
Concurrent refetch behavior is properly implemented and tested
The verification of the concurrent refetch behavior in the codebase has been successful. The test case in
src/run-cache.test.ts(lines 300-302) explicitly checks for the correct handling of multiple concurrentRunCache.refetch()calls:RunCache.refetch(key), RunCache.refetch(key), RunCache.refetch(key),This test ensures that only the first refetch call returns
true, while subsequent calls returnfalse, indicating that the source function is not called more than once at a time. The test expectations (lines 305-307) verify this behavior:expect(firstRefetch).toStrictEqual(true); expect(secondRefetch).toStrictEqual(false); expect(thirdRefetch).toStrictEqual(false);No other instances of potential concurrent
RunCache.refetch()calls were found in the codebase, suggesting that the implementation is consistent throughout.Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify that the `refetch()` method does not call the source function more than once at a time. # Test: Search for the `refetch()` method usage. Expect: No occurrences of multiple concurrent refetch requests without proper synchronization. ast-grep --lang typescript --pattern $' $$$ RunCache.refetch($_) $$$ RunCache.refetch($_) $$$ 'Length of output: 594
Script:
#!/bin/bash # Description: Verify the usage of RunCache.refetch() method and look for potential concurrent calls # Search for RunCache.refetch() usage using ast-grep echo "Searching for RunCache.refetch() usage:" ast-grep --lang typescript --pattern 'RunCache.refetch($_)' # Search for multiple RunCache.refetch() calls within 5 lines using ripgrep echo -e "\nSearching for potential concurrent RunCache.refetch() calls:" rg 'RunCache\.refetch\(' -A 5 | rg 'RunCache\.refetch\(' --context 5Length of output: 3225
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Actionable comments posted: 2
Outside diff range comments (1)
src/run-cache.ts (1)
Line range hint
147-147: Fix property assignment order to correctly set the 'fetching' flagIn the
refetchmethod, when updating the cache, the order of property assignments may result in thefetchingflag not being set correctly. Since object spread syntax overwrites properties from left to right, placing...cachedor...refetchedCacheafterfetchingmay overwrite thefetchingproperty.Apply this diff to fix the issue:
// Line 147 - RunCache.cache.set(key, { fetching: true, ...cached }); + RunCache.cache.set(key, { ...cached, fetching: true }); // Line 161 - RunCache.cache.set(key, { fetching: undefined, ...refetchedCache }); + RunCache.cache.set(key, { ...refetchedCache, fetching: undefined });Also applies to: 161-161
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README.md (6)
8-8: Excellent correction!The term "dependency-free" is more conventional and clear compared to "dependency nil". This change aligns with the past review comment suggesting the use of "zero-dependency" or "dependency-free".
Line range hint
34-106: Great examples for the new event handling features!The new examples for setting up event listeners for cache expiry and refetching align well with the introduction of the
EventEmitterfunctionality. They provide clear guidance on how to use the new features, demonstrating how to listen for all expiries/refetches or for specific keys.Removing
asyncfrom theonExpiryandonRefetchcallback signatures is appropriate as the callbacks are not performing asynchronous operations.These changes also address the past review comments suggesting updates to the
onExpiryandonRefetchexamples to reflect the newEventEmitterusage.
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115-122:
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125-132:
135-135: Nice improvement to the heading!Adding the article "the" enhances the clarity and readability of the heading. This change aligns with the past review comment suggesting this improvement.
142-166: Excellent addition of the event listener management section!The new section on clearing event listeners provides valuable information and examples for managing listeners effectively. The examples cover different scenarios, such as clearing all listeners, specific event listeners, and specific event key listeners, enhancing the flexibility and control over event management.
Clearing listeners is crucial for proper memory management and ensuring that listeners do not remain active longer than necessary. This section will help developers optimize their usage of the
RunCachelibrary and prevent potential memory leaks.Great work on adding this important information to the documentation!
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- src/run-cache.test.ts (4 hunks)
- src/run-cache.ts (9 hunks)
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Learnings (1)
src/run-cache.test.ts (1)
Learnt from: helloscoopa PR: helloscoopa/run-cache#16 File: src/run-cache.test.ts:152-153 Timestamp: 2024-09-19T04:50:47.105Z Learning: In test files, use `uuid()` for keys and values to maintain consistency across all tests, regardless of relevance.
Additional comments not posted (18)
src/run-cache.ts (15)
1-1: LGTM!The import statement correctly uses the
node:protocol to import theEventEmitterclass from the Node.js built-ineventsmodule.
11-11: LGTM!The addition of the
timeoutproperty to theCacheStatetype is correct and necessary for managing cache entry timeouts.
22-24: LGTM!The
EmitParamtype is correctly defined as a subset ofCacheStateproperties along with thekeyproperty. It serves as a suitable parameter type for theemitEventmethod.
26-30: LGTM!Defining event names as constants in the
EVENTobject is a good practice. It centralizes the event names and helps avoid typos and inconsistencies throughout the code.
32-33: LGTM!The
EventNametype is correctly defined as a union of the values of theEVENTobject. It provides type safety and ensures that only valid event names are used throughout the code.
34-35: LGTM!The updated
SourceFnandEventFntypes correctly allow for both promise and non-promise return types. This provides flexibility for the user when defining source functions and event callbacks.
39-40: LGTM!The addition of the private static properties
emitterandeventIdsto theRunCacheclass is correct. They are properly typed and initialized, and they serve their intended purposes of managing event listeners and storing event IDs.
77-82: LGTM!The added error handling for empty key and missing value/sourceFn scenarios is correct. The code throws errors with clear and descriptive messages, helping the user understand the issue when providing invalid input.
85-86: LGTM!The added error handling for the scenario where
autoRefetchis set without attlis correct. The code throws an error with a clear and descriptive message, helping the user understand the issue when providing invalid input.
90-112: LGTM!The timeout handling and event emission logic is implemented correctly. The code sets a timeout using the provided
ttlvalue, emits the "expire" event with the correct parameters usingRunCache.emitEvent, and callsRunCache.refetchwhen the necessary conditions are met. Errors fromRunCache.refetchare appropriately caught and ignored.
114-125: LGTM!The cache value assignment logic is implemented correctly. The code assigns the
valuetocacheValueif it's defined, otherwise it callssourceFnto obtain the cache value. It handles errors fromsourceFnappropriately and throws a new error with a descriptive message. The cache entry is set with the stringifiedcacheValue, ensuring that the stored value is always a string.
172-178: LGTM!The "refetch" event emission logic is implemented correctly. The code emits the "refetch" event using
RunCache.emitEventafter a successful refetch and passes the necessary parameters, including thekey,value,ttl,createAt, andupdateAt.
192-198: LGTM!The "refetch-failure" event emission logic is implemented correctly. The code emits the "refetch-failure" event using
RunCache.emitEventwhen thesourceFnfails during a refetch and passes the necessary parameters, including thekey,value,ttl,createAt, andupdateAt.
223-233: LGTM!The cache expiration handling and event emission logic is implemented correctly. The code checks for cache expiration using
RunCache.isExpiredand returns thevaluewhen the cache has not expired. When the cache has expired, it emits the "expire" event usingRunCache.emitEventwith the necessary parameters, including thekey,value,ttl,createAt, andupdateAt.
253-258: LGTM!The timeout clearing logic when deleting a cache entry is implemented correctly. The code retrieves the cache entry using
RunCache.cache.get(key)and clears the timeout usingclearTimeoutif thetimeoutproperty exists. This prevents any pending timeouts from executing after the cache entry is deleted.src/run-cache.test.ts (3)
336-363: Tests foronExpire()andonKeyExpiry()are well implementedThe tests correctly verify that the expiry callbacks are triggered appropriately after the TTL expires.
365-400: Tests foronRefetch()andonKeyRefetch()are comprehensiveThe tests effectively validate that refetch callbacks are invoked as expected when auto-refetching is enabled.
402-448: Tests foronRefetchFailure()andonKeyRefetchFailure()handle failure scenariosThe tests correctly simulate source function failures and ensure that the failure callbacks are triggered as expected.
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Files selected for processing (2)
- src/run-cache.test.ts (4 hunks)
- src/run-cache.ts (10 hunks)
Additional context used
Learnings (1)
src/run-cache.test.ts (1)
Learnt from: helloscoopa PR: helloscoopa/run-cache#16 File: src/run-cache.test.ts:152-153 Timestamp: 2024-09-19T04:50:47.105Z Learning: In test files, use `uuid()` for keys and values to maintain consistency across all tests, regardless of relevance.
Additional comments not posted (15)
src/run-cache.ts (12)
1-1: LGTM!The import statement correctly uses the
node:protocol to import theEventEmitterclass from the Node.js built-ineventsmodule.
22-25: LGTM!The
EmitParamtype is correctly defined using thePickutility type to select specific properties fromCacheStateand include an additionalkeyproperty. This ensures that only the necessary properties are included when emitting events.
26-30: LGTM!Defining the
EVENTobject with string constants for different event names is a good practice. It helps maintain consistency and avoids typos when referencing event names throughout the code. UsingObject.freezeensures that the object is immutable, preventing accidental modifications.
32-33: LGTM!The
EventNametype is correctly defined using thekeyofoperator on theEVENTobject. It creates a union type of the string literal types of theEVENTobject's keys, ensuring that only valid event names can be used when specifying event names in the code.
34-35: LGTM!The updated type definitions for
SourceFnandEventFnallow for both synchronous and asynchronous return types. This provides flexibility in defining source functions and event handlers, enabling the use of both synchronous and asynchronous operations within these functions.
39-40: LGTM!The addition of the private static properties
emitterandeventIdsto theRunCacheclass is appropriate.
- The
emitterproperty creates an instance of theEventEmitterclass for handling events within theRunCacheclass.- The
eventIdsproperty stores the event IDs of the registered event listeners, which can be useful for managing and clearing event listeners later.
49-62: LGTM!The updated JSDoc comment for the
setmethod provides clear and detailed information about the method's parameters and the error conditions it may throw.
- The
@paramtags describe theparamsobject and its properties, making it easier for developers to understand the expected input.- The
@throwstags document the error conditions and the corresponding error messages, helping developers handle potential errors appropriately.The improved documentation enhances the usability and maintainability of the code.
77-82: LGTM!The error handling for empty
keyand missingvalueorsourceFnis implemented correctly.
- If the
keyis empty or falsy, an error is thrown with the message "Empty key", preventing the use of invalid keys.- If both
valueandsourceFnare falsy, an error is thrown with the message "valuecan't be empty without asourceFn", ensuring that either a value or a source function is provided.Throwing errors with descriptive messages helps identify and fix issues related to invalid or missing input, improving the reliability and usability of the code.
85-86: LGTM!The error handling for the case when
autoRefetchis set without attlis implemented correctly.
- If
autoRefetchis truthy andttlis falsy, an error is thrown with the message "autoRefetchis not allowed without attl".This ensures that
autoRefetchis only used when a validttlis provided, preventing unexpected behavior and improving the reliability of the code.
90-112: LGTM!The TTL handling and timeout logic are implemented correctly:
- The code throws an error if
ttlis negative, preventing invalid TTL values.- It sets a timeout using
setTimeoutto expire the cache entry after the specifiedttl.- When the timeout expires, it emits the
EVENT.EXPIREevent with the cache entry details using theemitEventmethod.- If
autoRefetchis enabled and asourceFnis provided, it attempts to refetch the value for thekeyusing therefetchmethod.- Any errors thrown during the refetch process are caught and ignored, preventing unhandled promise rejections.
The code handles the TTL expiration and auto-refetching functionality as expected, improving the reliability and performance of the cache system.
114-122: LGTM!The handling of
undefinedvalue andsourceFnis implemented correctly:
- If
valueisundefinedandsourceFnis a function, the code calls thesourceFnto generate the cache value.- If the
sourceFnthrows an error, it is caught and a new error is thrown with a descriptive message indicating the failure for the specific key.- The code ensures that
cacheValueis always assigned a value, either from the providedvalueor generated by thesourceFn.This allows for flexibility in providing either a direct value or a source function to generate the cache value, while handling potential errors appropriately.
11-11: Verify the availability of@types/nodepackage.Ensure that the
@types/nodepackage is installed as a development dependency to provide the necessary type definitions forNodeJS.Timeout. If it's not installed, you may encounter type errors.You can run the following command to check if the package is installed:
Verification successful
Verification successful: @types/node package is installed
The @types/node package is correctly installed in the project, providing the necessary type definitions for NodeJS.Timeout. No further action is required regarding this aspect of the code.
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src/run-cache.test.ts (3)
1-2: Import statements added correctlyThe necessary imports for
EVENT,EventParam,RunCache, anduuidare appropriately included.
19-20: Clearing event listeners after each testIncluding
RunCache.clearEventListeners();in theafterEach()hook ensures that event listeners do not interfere with other tests, maintaining test isolation.
429-433: Verify necessity of providing bothvalueandsourceFninset()Providing both
valueandsourceFntoRunCache.set()may be redundant, assourceFnis used to generate the value if it's not provided. Ensure that passing both is intentional and aligns with theRunCacheAPI.Run the following script to identify other instances where both
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Files selected for processing (2)
- src/run-cache.test.ts (4 hunks)
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Additional context used
Learnings (1)
src/run-cache.test.ts (1)
Learnt from: helloscoopa PR: helloscoopa/run-cache#16 File: src/run-cache.test.ts:152-153 Timestamp: 2024-09-19T04:50:47.105Z Learning: In test files, use `uuid()` for keys and values to maintain consistency across all tests, regardless of relevance.
Additional comments not posted (15)
src/run-cache.ts (14)
1-1: LGTM!The import statement correctly uses the
node:protocol to import theEventEmitterclass from the Node.js built-ineventsmodule.
22-24: LGTM!The
EmitParamtype correctly defines the shape of the object passed to theemitEventmethod. It includes the necessary properties fromCacheStateand thekeyproperty to identify the cache entry.
26-30: LGTM!The
EVENTobject is a good practice for centralizing event names used in theRunCacheclass. By defining them as frozen properties, it ensures consistency and prevents accidental modifications.
32-33: LGTM!The
EventNametype provides type safety by restricting the allowed event names to the property values of theEVENTobject. This ensures that only valid event names can be used throughout theRunCacheclass.
34-35: LGTM!The
SourceFnandEventFntype definitions provide flexibility by allowing the functions to return either a promise or a direct value. This accommodates both asynchronous and synchronous operations.
39-40: LGTM!The addition of the
emitterproperty of typeEventEmitterenables event-driven functionality within theRunCacheclass. TheeventIdsproperty helps keep track of registered event IDs for cleanup purposes.
49-62: LGTM!The updated JSDoc comment for the
setmethod provides clear and detailed documentation. It describes the purpose of each parameter, the possible return value, and the errors that can be thrown. This helps developers understand and use the method correctly.
77-93: LGTM!The added error checks in the
setmethod improve its robustness by validating the input parameters. Throwing errors for empty key, missingvalueandsourceFn,autoRefetchwithoutttl, and negativettlhelps prevent unexpected behavior and provides clear feedback to the developers.
95-112: LGTM!The timeout logic in the
setmethod handles cache entry expiration effectively. Emitting the "expire" event notifies subscribers about the expiration. Automatically refetching the cache value whenautoRefetchis enabled helps keep the cache up to date. Ignoring errors during the refetch process prevents unhandled exceptions in the timeout callback.
114-125: LGTM!The cache value generation logic in the
setmethod handles different scenarios effectively. It uses the providedvaluewhen available and callssourceFnto generate the cache value whenvalueisundefined. Catching errors thrown bysourceFnand throwing a new error with a specific message improves error handling. Stringifying the cache value ensures consistent storage in the cache.
127-129: LGTM!Including
sourceFn,autoRefetch, andtimeoutin the cache entry provides additional functionality and flexibility:
sourceFnallows refetching the value using the same source function.autoRefetchenables automatic refetching based on the cache entry configuration.timeoutallows clearing the timeout when necessary (e.g., when the entry is deleted).
151-151: LGTM!Returning
falsewhencached.sourceFnisundefinedis appropriate because it indicates that the refetch operation cannot be performed due to the absence of a source function. This behavior is consistent with the method's return type.
Line range hint
171-197: LGTM!The event emission logic in the
refetchmethod keeps subscribers informed about the refetch process:
- Emitting the "refetch" event notifies subscribers that the cache value has been successfully refetched.
- Emitting the "refetch-failure" event notifies subscribers that an error occurred during the refetch process.
- The emitted events include relevant information such as the cache key, value, TTL, creation timestamp, and update timestamp, providing useful context to the subscribers.
11-11: Verify if@types/nodeis installed.The
NodeJS.Timeouttype is specific to the Node.js environment. Ensure that the@types/nodepackage is installed to provide the necessary type definitions.You can install it by running:
Run the following script to check if
@types/nodeis installed:Verification successful
@types/node is already installed
The verification process confirms that
@types/nodeis listed in the project's dependencies. No further action is required as the necessary type definitions forNodeJS.Timeoutshould be available.Scripts executed
The following scripts were executed for the analysis:
Script:
npm install --save-dev @types/nodeLength of output: 107
Script:
#!/bin/bash # Check if `@types/node` is listed in the dependencies if grep -q "@types/node" package.json; then echo "✅ @types/node is installed" else echo "❌ @types/node is not installed" fiLength of output: 97
src/run-cache.test.ts (1)
402-444: Verify the Expected Number of Calls tosourceFnand Failure CallbacksIn the
"onRefetchFailure() and onKeyRefetchFailure()"test,sourceFnis expected to have been called once, butfuncToBeExecutedOnRefetchFailureis expected to have been called two times. This may indicate an inconsistency since the failure callbacks are triggered based onsourceFnexecutions.Please ensure that the number of times
sourceFnandfuncToBeExecutedOnRefetchFailureare called aligns with the expected behavior.Run the following script to verify the event emission:
This script will display the expected call counts, allowing you to cross-verify them with the actual behavior during test execution.
Verification successful
To gather more specific information about the test case in question and verify the behavior, I'll run additional scripts to examine the test implementation and related code.
This script will help us:
- Examine the specific test case implementation.
- Look at the RunCache.set method to understand how it handles refetching.
- Investigate the refetch mechanism in RunCache to see why the failure callback might be called twice.
To address the missing information and gather more context, I'll run additional scripts with modified search patterns.
This script will help us:
- Locate the specific test case with a more flexible search pattern.
- Correctly extract the RunCache.set method implementation.
- Find the implementations of onRefetchFailure and onKeyRefetchFailure.
- Identify where and how the refetch method is used in the context of our scenario.
To address the remaining issues and gather more context, I'll run additional scripts with modified search patterns.
This script will help us:
- Locate any test cases related to refetch failure, which should include our target test case.
- Correctly extract the RunCache.set method implementation with a simpler pattern.
- Find the implementation of the refetch method to understand how it handles failures.
- Identify where and how the REFETCH_FAILURE event is emitted, which should explain why the failure callbacks are called twice.
Verification Results: Test Case Not Found, But Behavior Explained
The specific test case mentioned in the original review comment ("onRefetchFailure() and onKeyRefetchFailure()") could not be located in the current codebase. However, analysis of the RunCache implementation provides an explanation for the behavior described:
- The
refetchmethod emits aREFETCH_FAILUREevent when an error occurs during refetching.- There are two separate event listeners for refetch failures:
- A general listener (
onRefetchFailure)- A key-specific listener (
onKeyRefetchFailure)This dual-listener setup explains why the failure callback is called twice when a single refetch failure occurs. The
sourceFnis indeed called once, but it triggers two separate event listeners.Given these findings:
- The original test case may have been removed or significantly modified.
- The behavior of calling the failure callback twice for a single
sourceFncall is consistent with the current implementation.Recommendation:
- Review and update the test suite to ensure it covers the current implementation of refetch failure handling.
- Consider adding a new test case that specifically verifies the dual-callback behavior for refetch failures.
Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Verify the number of times 'sourceFn' and 'funcToBeExecutedOnRefetchFailure' are called in the test. # Extract expected call counts from the test file echo "Expected calls to sourceFn:" rg --multiline -o 'expect\(sourceFn\)\.toHaveBeenCalledTimes\((\d+)\)' --replace '$1' src/run-cache.test.ts echo "Expected calls to funcToBeExecutedOnRefetchFailure:" rg --multiline -o 'expect\(funcToBeExecutedOnRefetchFailure\)\.toHaveBeenCalledTimes\((\d+)\)' --replace '$1' src/run-cache.test.tsLength of output: 457
Script:
#!/bin/bash # Description: Extract the specific test case and examine RunCache implementation # Find the specific test case echo "Test case implementation:" rg -U "it\('onRefetchFailure\(\) and onKeyRefetchFailure\(\)'.*?\}\);" src/run-cache.test.ts -A 50 echo "\nRunCache.set implementation:" ast-grep --lang typescript --pattern 'static set($$$) { $$$ }' echo "\nRunCache refetch mechanism:" rg -U "refetch.*?\{" src/run-cache.ts -A 20Length of output: 1790
Script:
#!/bin/bash # Description: Search for test case, RunCache.set, and failure callback implementations # Find the test case with a more flexible pattern echo "Test case implementation:" rg -U "it\(.*?onRefetchFailure.*?onKeyRefetchFailure.*?\}\);" src/run-cache.test.ts -A 50 # Extract RunCache.set implementation echo "\nRunCache.set implementation:" ast-grep --lang typescript --pattern 'static set($_: $_) { $$$ }' # Find onRefetchFailure and onKeyRefetchFailure implementations echo "\nonRefetchFailure and onKeyRefetchFailure implementations:" rg -U "static (onRefetchFailure|onKeyRefetchFailure).*?\{" src/run-cache.ts -A 10 # Search for refetch method usage echo "\nrefetch method usage:" rg "RunCache\.refetch" src/run-cache.ts -A 5Length of output: 1891
Script:
#!/bin/bash # Description: Search for refetch failure tests, RunCache.set, refetch method, and failure event emissions # Find test cases related to refetch failure echo "Refetch failure test cases:" rg -U "it\(.*?refetch.*?failure.*?\}\);" src/run-cache.test.ts -A 20 # Extract RunCache.set implementation with a simpler pattern echo "\nRunCache.set implementation:" ast-grep --lang typescript --pattern 'static set($_) { $$$ }' # Find the refetch method implementation echo "\nRefetch method implementation:" rg -U "static async refetch.*?\{" src/run-cache.ts -A 30 # Search for EVENT.REFETCH_FAILURE usage echo "\nEVENT.REFETCH_FAILURE usage:" rg "EVENT\.REFETCH_FAILURE" src/run-cache.ts -A 5Length of output: 2278
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- README.md (4 hunks)
- src/run-cache.test.ts (4 hunks)
- src/run-cache.ts (10 hunks)
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Learnings (1)
src/run-cache.test.ts (1)
Learnt from: helloscoopa PR: helloscoopa/run-cache#16 File: src/run-cache.test.ts:152-153 Timestamp: 2024-09-19T04:50:47.105Z Learning: In test files, use `uuid()` for keys and values to maintain consistency across all tests, regardless of relevance.
LanguageTool
README.md
[uncategorized] ~8-~8: This verb does not appear to agree with the subject. Consider using a different form.
Context: ...generated from sync/async functions and provide methods to refetch them on expiry or on...(AI_EN_LECTOR_REPLACEMENT_VERB_AGREEMENT)
[uncategorized] ~8-~8: Possible missing article found.
Context: ...fetch them on expiry or on demand; with set of events to keep track of the state of...(AI_HYDRA_LEO_MISSING_A)
Additional comments not posted (8)
README.md (5)
8-8: Approve: The change from "dependency nil" to "dependency-free" improves clarity.The terminology change aligns with the suggestion from the previous review and enhances the description's clarity.
Tools
LanguageTool
[uncategorized] ~8-~8: This verb does not appear to agree with the subject. Consider using a different form.
Context: ...generated from sync/async functions and provide methods to refetch them on expiry or on...(AI_EN_LECTOR_REPLACEMENT_VERB_AGREEMENT)
[uncategorized] ~8-~8: Possible missing article found.
Context: ...fetch them on expiry or on demand; with set of events to keep track of the state of...(AI_HYDRA_LEO_MISSING_A)
12-16: LGTM: The added features accurately represent the library's capabilities.The new features listed in the "Features" section, such as being dependency-free, providing in-memory caching, supporting sync/async source functions, providing events, and having an intuitive SDK, align with the library's description and the PR objectives. They provide a clear overview of the library's key selling points.
Line range hint
34-106: Excellent: The added examples effectively demonstrate the library's usage and new event-driven features.The "Set cache" section now includes comprehensive examples of setting cache values with various options, such as TTL, source functions, and auto-refetching. The introduction of event listeners for cache expiry and refetching aligns with the PR objectives and showcases the library's new event-driven capabilities.
The examples cover different scenarios, such as registering event listeners for all expiries/refetches or for specific keys, providing developers with the flexibility to handle cache events according to their needs. The use of the
EventParamtype ensures type safety and clarity in the callback function parameters.Overall, these examples significantly enhance the documentation and make it easier for developers to understand and utilize the library's features effectively.
135-135: Resolved: The addition of the article "the" improves the heading's readability.The heading now reads "Check the existence of a specific cache," which addresses the previous suggestion and enhances the clarity of the sentence. This minor adjustment improves the overall readability of the documentation.
142-158: Excellent: The "Clear event listeners" section and examples provide a valuable feature for managing event listeners.The addition of the "Clear event listeners" section aligns with the PR objectives and introduces a way to effectively manage event listeners in the library. The examples demonstrate how to clear all event listeners, specific event listeners (e.g., "expiry"), and specific event key listeners (e.g., "expiry" for a specific key), providing developers with the flexibility to control listener behavior.
The ability to clear event listeners is crucial for proper memory management and preventing unnecessary listener accumulation, especially in long-running applications. The examples are clear and cover different scenarios, making it easy for developers to understand and utilize the feature effectively.
Overall, this addition enhances the library's functionality and usability, and the documentation effectively communicates its usage.
src/run-cache.ts (3)
1-1: LGTM!The import statement for
EventEmitterusing the 'node:' protocol is correct.
95-111: Proper exception handling in asynchronoussetTimeoutcallbackGreat job handling exceptions within the
setTimeoutcallback by using atry-catchblock. This ensures that any errors duringawait RunCache.refetch(key);are properly caught, preventing unhandled promise rejections.
311-321: Efficient event emission inemitEventmethodThe
emitEventmethod correctly emits both global and key-specific events, allowing for flexible event handling.
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Outside diff range comments (1)
README.md (1)
Line range hint
34-89: Great examples demonstrating the usage ofRunCache.set!The code segment provides clear and concise examples of how to set cache values using the
RunCache.setmethod, covering various use cases such as setting a simple value, a value with a TTL, a value with a source function, and a value with auto-refetch enabled.The examples also demonstrate how to use the new event handling features, such as
onExpiryandonRefetch, to get notified when a cache entry expires or is refetched.Consider adding an example that demonstrates how to handle errors that may occur during the execution of the source function. This could help users understand how to properly handle and recover from errors in their caching logic.
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- src/run-cache.ts (10 hunks)
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Learnings (1)
src/run-cache.test.ts (1)
Learnt from: helloscoopa PR: helloscoopa/run-cache#16 File: src/run-cache.test.ts:152-153 Timestamp: 2024-09-19T04:50:47.105Z Learning: In test files, use `uuid()` for keys and values to maintain consistency across all tests, regardless of relevance.
Additional comments not posted (13)
README.md (8)
8-8: LGTM!The sentence provides a clear and concise description of the RunCache library, highlighting its key features and benefits.
12-16: LGTM!The list of features accurately describes the capabilities of the RunCache library and is well-formatted for readability.
91-94: LGTM!The code segment demonstrates how to register an event listener for all refetch events using the
RunCache.onRefetchmethod. The callback function logs a message indicating that a specific cache key has been refetched, which can be useful for debugging and monitoring purposes.
96-98: LGTM!The code segment demonstrates how to register an event listener for a specific key refetch event using the
RunCache.onKeyRefetchmethod. The callback function logs a message indicating that the specific cache key has been refetched, which can be useful for debugging and monitoring purposes.
108-112: LGTM!The code segment demonstrates how to refetch a cache value using the
RunCache.refetchmethod. The comment provides a clear explanation of the requirement for therefetchmethod to work, which is that the key must be set with asourceFn.
Line range hint
115-122: LGTM!The code segment demonstrates how to get a cache value using the
RunCache.getmethod. The comment provides a clear explanation of the behavior of thegetmethod whensourceFnis provided andautoRefetchis set totrue, which is that it will automatically refetch the value.
125-132: LGTM!The code segment demonstrates how to delete a specific cache key using the
RunCache.deletemethod and how to delete all cache keys using theRunCache.flushmethod. The comments provide clear explanations of the behavior of each method, and the examples are simple and easy to understand.
135-157: LGTM!The code segment demonstrates how to check the existence of a specific cache key using the
RunCache.hasmethod and how to clear event listeners using theRunCache.clearEventListenersmethod.The comment provides a clear explanation of the behavior of the
hasmethod, including the fact that expired cache keys returnfalseeven if they are refetchable.The examples show the different ways to clear event listeners, including clearing all listeners, clearing specific event listeners, and clearing specific event key listeners. This can be useful for managing memory and preventing unnecessary callbacks.
src/run-cache.ts (5)
1-1: Importing 'EventEmitter' using 'node:' protocol ensures proper module resolutionThe import statement correctly uses the
node:protocol to importEventEmitterfrom the Node.js built-ineventsmodule. This approach enhances clarity and ensures that the correct module and type declarations are used.
115-119: Check for empty string values explicitlyIn the condition
if (value === undefined && typeof sourceFn === "function"), you correctly check forundefined, allowing empty strings ('') to be valid cache values. This ensures that falsy but valid values like empty strings are handled properly.
251-257: Clear timeouts when deleting cache entries to prevent memory leaksThe
deletemethod correctly checks for an existingtimeoutand clears it when deleting a cache entry. This helps prevent memory leaks due to lingering timers.
267-275: Flush method effectively clears cache and associated timeoutsThe
flushmethod iterates over all cache entries, clears any associated timeouts, and then clears the cache. This ensures that all timers are properly cleared and the cache is fully reset.
310-320: Efficiently emitting events for both global and key-specific listenersThe
emitEventmethod smartly emits events for both the global event name and the key-specific event name, facilitating flexible event handling for subscribers.
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Learnings (2)
package.json (1)
Learnt from: helloscoopa PR: helloscoopa/run-cache#16 File: package.json:36-36 Timestamp: 2024-09-19T01:41:52.690Z Learning: In the 'run-cache' project, the `uuid` package is only used in tests.src/run-cache.test.ts (1)
Learnt from: helloscoopa PR: helloscoopa/run-cache#16 File: src/run-cache.test.ts:152-153 Timestamp: 2024-09-19T04:50:47.105Z Learning: In test files, use `uuid()` for keys and values to maintain consistency across all tests, regardless of relevance.
Additional comments not posted (5)
package.json (4)
3-3: LGTM!The version number has been updated appropriately for a minor release.
4-4: LGTM!The updated description enhances clarity by specifying that the library is "dependency-free", emphasizing its lightweight design.
32-32: LGTM!The addition of
@types/uuidprovides TypeScript type definitions for theuuidlibrary, improving type safety when generating and manipulating UUIDs.
36-36: LGTM!The addition of the
uuidpackage allows for UUID generation within the project. As noted in the learnings, sinceuuidis only used in tests, keeping it underdevDependenciesis appropriate.src/run-cache.test.ts (1)
282-282: Await 'expect' to properly handle Promise rejectionIn asynchronous tests, you should
awaittheexpectassertion to correctly handle the promise rejection.
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Biome
src/run-cache.ts
[error] 92-92: Change to an optional chain.
Unsafe fix: Change to an optional chain.
(lint/complexity/useOptionalChain)
Additional comments not posted (13)
src/run-cache.ts (13)
1-1: Correct import statement with 'node:' protocolThe import statement correctly uses the 'node:' protocol, which is recommended for Node.js built-in modules. This ensures clarity and proper type declarations are found by TypeScript.
11-11: Adding 'timeout' to 'CacheState'The addition of the
timeoutproperty toCacheStateallows proper tracking and management of cache entry timeouts.
22-24: Defining 'EmitParam' type for event emissionThe
EmitParamtype is appropriately defined to encapsulate the necessary properties for event emission, including cache metadata and the key.
26-30: Defining event constants using 'Object.freeze'The
EVENTconstants are correctly defined and frozen to prevent modification, ensuring consistent event names throughout the codebase.
32-33: Defining 'EventName' typeThe
EventNametype is correctly defined to be one of the event names defined inEVENT, ensuring type safety for event-related methods.
34-35: Defining 'SourceFn' and 'EventFn' typesThe
SourceFnandEventFntypes are appropriately defined for the cache source function and event callbacks, respectively.
39-39: Initializing 'emitter' as an instance of 'EventEmitter'The addition of the
emitterproperty allows the cache to emit events, facilitating the new event-driven architecture.
76-77: Properly validating non-empty cache keysGood job adding validation to ensure that the cache key is a non-empty string, preventing potential issues with empty keys.
88-93: Clearing existing timeouts when overwriting cache entriesGood practice of clearing existing timeouts when overwriting cache entries. This prevents multiple timeouts for the same key, avoiding potential duplicate events or unexpected behavior.
Tools
Biome
[error] 92-92: Change to an optional chain.
Unsafe fix: Change to an optional chain.
(lint/complexity/useOptionalChain)
259-261: Clearing timeouts when deleting cache entriesGood job clearing any existing timeouts when deleting a cache entry. This ensures that no unnecessary timeouts remain active after the entry is removed.
272-280: Clearing all timeouts when flushing the cacheProperly clearing all active timeouts before clearing the cache ensures that there are no lingering timeouts after the cache is flushed.
315-325: Efficiently emitting events for both global and key-specific listenersThe
emitEventmethod correctly emits events for both the general event name and the key-specific event name, allowing listeners to handle events at different granularity levels.
406-441: Proper implementation of 'clearEventListeners' methodThe
clearEventListenersmethod effectively removes event listeners based on the provided parameters, handling cases for all listeners, specific events, and specific event-key combinations.
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Review details
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Files selected for processing (2)
- src/run-cache.test.ts (3 hunks)
- src/run-cache.ts (9 hunks)
Additional context used
Learnings (1)
src/run-cache.test.ts (2)
Learnt from: helloscoopa PR: helloscoopa/run-cache#16 File: src/run-cache.test.ts:445-446 Timestamp: 2024-09-19T11:53:52.280Z Learning: When both `value` and `sourceFn` are provided to `RunCache.set()`, the `sourceFn` is not called during `set()`.Learnt from: helloscoopa PR: helloscoopa/run-cache#16 File: src/run-cache.test.ts:152-153 Timestamp: 2024-09-19T04:50:47.105Z Learning: In test files, use `uuid()` for keys and values to maintain consistency across all tests, regardless of relevance.
Additional comments not posted (13)
src/run-cache.ts (2)
301-307: Verify Potential Duplicate 'expire' EventsThe
EVENT.EXPIREis emitted in both thesetTimeoutcallback and thehasmethod when an expired entry is encountered. This might result in duplicate events for a single expiration.Please ensure that emitting
EVENT.EXPIREin thehasmethod does not cause unintended side effects due to duplicate events.
195-200: Preserve Original Error in Refetch FailureSimilarly, in the
refetchmethod, the original error fromsourceFnis not included when throwing a new error. Including it can aid in diagnosing issues during refetching.Modify the error handling to include the original error message:
// Inside the catch block throw new Error(`Source function failed for key: '${key}'. Error: ${e.message}`);Likely invalid or redundant comment.
src/run-cache.test.ts (11)
1-2: Import Statements Are CorrectThe import statements appropriately include all necessary modules for the tests:
import { EVENT, EventParam, RunCache } from "./run-cache"; import { v4 as uuid } from "uuid";
6-9: Proper Setup inbeforeEachHookThe
beforeEachhook correctly sets up the test environment by using fake timers and flushing the cache:jest.useFakeTimers(); RunCache.flush();This ensures each test starts with a clean slate and that timing-related functionalities are consistently tested.
12-15: Effective Cleanup inafterEachHookThe
afterEachhook effectively cleans up after each test by clearing timers, restoring real timers, and clearing event listeners:jest.clearAllTimers(); jest.useRealTimers(); RunCache.clearEventListeners();This prevents side effects from one test affecting others.
39-49: Correct Handling of Source Function ErrorsThe test accurately verifies that an error is thrown when the
sourceFnthrows an exception duringRunCache.set():const sourceFn = jest.fn(async () => { throw Error("Unexpected Error"); }); await expect( RunCache.set({ key, sourceFn, }), ).rejects.toThrow(`Source function failed for key: '${key}'`); expect(sourceFn).toHaveBeenCalledTimes(1);This ensures that error handling in
RunCache.set()works as expected when the source function fails.
243-247: Correct Behavior When Refetching Without a Source FunctionThe test correctly asserts that
RunCache.refetch()resolves tofalsewhen called on a key that has nosourceFn:await RunCache.set({ key, value: uuid() }); await expect(RunCache.refetch(key)).resolves.toStrictEqual(false);This behavior is appropriate, as refetching should not occur when there is no source function to provide a new value.
282-298: Accurate Testing of Concurrent Refetch PreventionThe test effectively checks that multiple concurrent calls to
RunCache.refetch()on the same key do not result in multiple source function executions:const [firstRefetch, secondRefetch, thirdRefetch] = await Promise.all([ RunCache.refetch(key), RunCache.refetch(key), RunCache.refetch(key), ]); expect(firstRefetch).toStrictEqual(true); expect(secondRefetch).toStrictEqual(false); expect(thirdRefetch).toStrictEqual(false); expect(sourceFn).toHaveBeenCalledTimes(1);This ensures that the cache correctly handles concurrent refetch attempts by allowing only one execution of the source function at a time.
323-349: Effective Testing of Expiry Event HandlersThe test successfully verifies that both
onExpiryandonKeyExpiryevent handlers are triggered after the TTL expiry:RunCache.onExpiry(funcToBeExecutedOnExpiry); RunCache.onKeyExpiry(key, funcToBeExecutedOnExpiry); RunCache.set({ key, value: value, ttl: 100, }); jest.advanceTimersByTime(101); await Promise.resolve(); // Flush microtasks expect(funcToBeExecutedOnExpiry).toHaveBeenCalledTimes(2);This confirms that the event handlers are functioning as intended and are called upon cache entry expiration.
352-383: Proper Verification of Refetch Event HandlersThe test accurately checks that
onRefetchandonKeyRefetchhandlers are invoked when a refetch occurs:RunCache.onRefetch(funcToBeExecutedOnRefetch); RunCache.onKeyRefetch(key, funcToBeExecutedOnRefetch); await RunCache.set({ key, sourceFn, ttl: 100, autoRefetch: true, }); dynamicValue = uuid(); jest.advanceTimersByTime(101); await Promise.resolve(); // Flush microtasks expect(sourceFn).toHaveBeenCalledTimes(2); expect(funcToBeExecutedOnRefetch).toHaveBeenCalledTimes(2);This ensures that the cache correctly emits events during refetch operations and that the handlers receive the updated cache state.
386-428: Validation of Refetch Failure Event HandlersThe test properly verifies that
onRefetchFailureandonKeyRefetchFailurehandlers are triggered when thesourceFnfails during a refetch:RunCache.onRefetchFailure(funcToBeExecutedOnRefetchFailure); RunCache.onKeyRefetchFailure(key, funcToBeExecutedOnRefetchFailure); await RunCache.set({ key, value, sourceFn, ttl: 100, autoRefetch: true, }); breaker = true; jest.advanceTimersByTime(101); await Promise.resolve(); // Flush microtasks expect(sourceFn).toHaveBeenCalledTimes(1); expect(funcToBeExecutedOnRefetchFailure).toHaveBeenCalledTimes(2);This confirms that the cache correctly handles source function failures during refetch and that the appropriate event handlers are notified.
88-97: Maintain Consistency with AsynchronoussourceFnSimilar to the previous test,
sourceFnhere is also synchronous:const sourceFn = jest.fn(() => value);For consistency and to better simulate asynchronous operations, consider updating
sourceFnto be asynchronous:- const sourceFn = jest.fn(() => value); + const sourceFn = jest.fn(async () => value);This adjustment helps ensure that the caching mechanism functions correctly with asynchronous source functions, which are common in real-world applications.
Skipped due to learnings
Learnt from: helloscoopa PR: helloscoopa/run-cache#16 File: src/run-cache.test.ts:445-446 Timestamp: 2024-09-19T11:53:52.280Z Learning: When both `value` and `sourceFn` are provided to `RunCache.set()`, the `sourceFn` is not called during `set()`.
74-80: Ensure Consistent Asynchronous Behavior insourceFnIn this test,
sourceFnis defined as a synchronous function:const sourceFn = jest.fn(() => value);To simulate real-world scenarios where
sourceFnmay involve asynchronous operations (e.g., fetching data from a database or an API), consider definingsourceFnas an asynchronous function:- const sourceFn = jest.fn(() => value); + const sourceFn = jest.fn(async () => value);This change will make the test more representative of actual usage and ensure that asynchronous behavior is consistently handled across all tests.
Skipped due to learnings
Learnt from: helloscoopa PR: helloscoopa/run-cache#16 File: src/run-cache.test.ts:445-446 Timestamp: 2024-09-19T11:53:52.280Z Learning: When both `value` and `sourceFn` are provided to `RunCache.set()`, the `sourceFn` is not called during `set()`.
Fixes #14
Fixes #15
Summary by CodeRabbit
New Features
RunCachelibrary, allowing for more flexible handling of cache expiration and refetching events.onExpiry,onKeyExpiry,onRefetch,onKeyRefetch) and clearing event listeners related to cache events.clearEventListenersmethod for better control over event management.autoRefetchoption in cache settings for automatic updates.Bug Fixes
Documentation
Tests