174 lines
6.8 KiB
Markdown
174 lines
6.8 KiB
Markdown
# @push.rocks/levelcache
|
|
A cache that utilizes memory, disk, and S3 for data storage and backup.
|
|
|
|
## Install
|
|
To install `@push.rocks/levelcache`, you can use npm or yarn:
|
|
|
|
```bash
|
|
npm install @push.rocks/levelcache --save
|
|
```
|
|
or
|
|
```bash
|
|
yarn add @push.rocks/levelcache
|
|
```
|
|
|
|
This installs `@push.rocks/levelcache` and adds it to your project's dependencies.
|
|
|
|
## Usage
|
|
|
|
`@push.rocks/levelcache` provides a comprehensive solution for multi-level caching that takes advantage of memory, disk, and Amazon S3 storage, making it a versatile tool for data caching and backup. The package is built with TypeScript, enabling strict type checks and better development experience. Below, we'll explore how to effectively employ `@push.rocks/levelcache` in your projects, discussing its features and demonstrating its usage with code examples.
|
|
|
|
### 1. Overview
|
|
|
|
The `LevelCache` class handles all cache operations. It decides where to store data based on pre-configured thresholds corresponding to the data size and the total storage capacity allocated for each storage type (memory/disk/S3). This mechanism optimizes both speed and persistence, allowing for efficient data storage and retrieval.
|
|
|
|
### 2. Getting Started: Initialization
|
|
|
|
To use `@push.rocks/levelcache`, you'll need to import the main classes: `LevelCache` and `CacheEntry`. `LevelCache` is the primary class, while `CacheEntry` represents individual pieces of cached data.
|
|
|
|
```typescript
|
|
import { LevelCache, CacheEntry } from '@push.rocks/levelcache';
|
|
```
|
|
|
|
#### Initialization with Optional Configurations
|
|
|
|
To create a cache, instantiate the `LevelCache` class with desired configurations. You can specify the limits for memory and disk storage, setup S3 configurations if needed, and more.
|
|
|
|
```typescript
|
|
const myCache = new LevelCache({
|
|
cacheId: 'myUniqueCacheId', // Unique ID for cache delineation
|
|
maxMemoryStorageInMB: 10, // Maximum memory use in MB (default 0.5 MB)
|
|
maxDiskStorageInMB: 100, // Maximum disk space in MB (default 10 MB)
|
|
diskStoragePath: './myCache', // Path for storing disk cache; default is '.nogit'
|
|
s3Config: {
|
|
accessKeyId: 'yourAccessKeyId', // AWS S3 access key
|
|
secretAccessKey: 'yourSecretAccessKey', // Corresponding secret key
|
|
region: 'us-west-2' // AWS region, e.g., 'us-west-2'
|
|
},
|
|
s3BucketName: 'myBucketName', // Designated name for S3 bucket
|
|
immutableCache: false, // Whether stored cache entries should remain unaltered
|
|
persistentCache: true, // Should the cache persist upon restarts
|
|
});
|
|
```
|
|
|
|
### 3. Storing and Retrieving Data
|
|
|
|
`LevelCache` methods enable seamless data storage and retrieval, handling complexity under the hood.
|
|
|
|
#### Storing Data
|
|
|
|
Create a `CacheEntry` specifying the data content and time-to-live (`ttl`). Use `storeCacheEntryByKey` to add this entry to the cache.
|
|
|
|
```typescript
|
|
async function storeData() {
|
|
// Wait for cache to be ready before operations
|
|
await myCache.ready;
|
|
|
|
const entryContents = Buffer.from('Caching this data');
|
|
const myCacheEntry = new CacheEntry({
|
|
ttl: 7200000, // Time-to-live in milliseconds (2 hours)
|
|
contents: entryContents,
|
|
});
|
|
|
|
// Storing the cache entry associated with a specific key
|
|
await myCache.storeCacheEntryByKey('someDataKey', myCacheEntry);
|
|
}
|
|
```
|
|
|
|
#### Retrieving Data
|
|
|
|
Retrieve stored data using `retrieveCacheEntryByKey`. The retrieved `CacheEntry` will give access to the original data.
|
|
|
|
```typescript
|
|
async function retrieveData() {
|
|
const retrievedEntry = await myCache.retrieveCacheEntryByKey('someDataKey');
|
|
if (retrievedEntry) {
|
|
const data = retrievedEntry.contents.toString();
|
|
console.log(data); // Expected output: Caching this data
|
|
} else {
|
|
console.log('Data not found or expired.');
|
|
}
|
|
}
|
|
```
|
|
|
|
### 4. Key Management: Updating and Deleting
|
|
|
|
#### Deleting Cache Entries
|
|
|
|
Remove entries with `deleteCacheEntryByKey`, enabling clean cache management.
|
|
|
|
```typescript
|
|
async function deleteData() {
|
|
// Removes an entry using its unique key identifier
|
|
await myCache.deleteCacheEntryByKey('someDataKey');
|
|
}
|
|
```
|
|
|
|
### 5. Cache Cleaning
|
|
|
|
Often, managing storage limits or removing outdated data becomes essential. The library supports these scenarios.
|
|
|
|
#### Automated Cleaning
|
|
|
|
While cache entries will naturally expire with `ttl` values, you can force-remove outdated entries.
|
|
|
|
```typescript
|
|
// Clean outdated or expired entries
|
|
await myCache.cleanOutdated();
|
|
```
|
|
|
|
#### Full Cache Reset
|
|
|
|
Clear all entries, efficiently resetting your cache storage.
|
|
|
|
```typescript
|
|
// Flush entire cache content
|
|
await myCache.cleanAll();
|
|
```
|
|
|
|
### 6. Configuring and Managing Advanced Use Cases
|
|
|
|
The flexible nature of `@push.rocks/levelcache` grants additional customization suited for more advanced requirements.
|
|
|
|
#### Custom Route Management
|
|
|
|
For certain demands, you might want to specify distinct data handling policies or routing logic.
|
|
|
|
- Adjust S3 handling, size thresholds, or immutability options dynamically.
|
|
- Utilize internal API expansions defined within the library for fine-grained operations.
|
|
|
|
#### Handling Large Datasets
|
|
|
|
Tailor the cache levels (memory, disk, S3) to accommodate higher loads:
|
|
|
|
```typescript
|
|
const largeDatasetCache = new LevelCache({
|
|
cacheId: 'largeDatasetCache',
|
|
// Customize limits and behavior for particular patterns
|
|
maxMemoryStorageInMB: 1024, // 1 GB memory allocation
|
|
maxDiskStorageInMB: 2048, // 2 GB disk space allowance
|
|
maxS3StorageInMB: 10240, // 10 GB S3 backup buffering
|
|
});
|
|
```
|
|
|
|
With intelligent routing and management embedded, `LevelCache` ensures optimal trade-offs between speed and stability.
|
|
|
|
## License and Legal Information
|
|
|
|
This repository contains open-source code that is licensed under the MIT License. A copy of the MIT License can be found in the [license](license) file within this repository.
|
|
|
|
**Please note:** The MIT License does not grant permission to use the trade names, trademarks, service marks, or product names of the project, except as required for reasonable and customary use in describing the origin of the work and reproducing the content of the NOTICE file.
|
|
|
|
### Trademarks
|
|
|
|
This project is owned and maintained by Task Venture Capital GmbH. The names and logos associated with Task Venture Capital GmbH and any related products or services are trademarks of Task Venture Capital GmbH and are not included within the scope of the MIT license granted herein. Use of these trademarks must comply with Task Venture Capital GmbH's Trademark Guidelines, and any usage must be approved in writing by Task Venture Capital GmbH.
|
|
|
|
### Company Information
|
|
|
|
Task Venture Capital GmbH
|
|
Registered at District court Bremen HRB 35230 HB, Germany
|
|
|
|
For any legal inquiries or if you require further information, please contact us via email at hello@task.vc.
|
|
|
|
By using this repository, you acknowledge that you have read this section, agree to comply with its terms, and understand that the licensing of the code does not imply endorsement by Task Venture Capital GmbH of any derivative works.
|