# @mojaloop/inter-scheme-proxy-cache-lib

`inter-scheme-proxy-cache-lib` is a common component that provides proxy caching mapping.
It helps reliably integrate proxy functionality throughout the all involved services.

## CI/CD

This repository uses the [mojaloop/build](https://github.com/mojaloop/ci-config-orb-build) CircleCI orb for standardized CI/CD workflows, including automated Grype vulnerability scanning for source code security.

## Use cases:
 - Proxy caching. (see [details](https://github.com/infitx-org/uml_diagrams/blob/main/Proxy/Proxy%20pattern%20-%20happy%20path.png))
 - Failure count cache with max failure count per {Id}. (see [details](https://github.com/infitx-org/uml_diagrams/blob/main/Proxy/Proxy%20pattern%20-%20Lazy%20Discovery%20-%20No%20Oracles.png))

## Quick Start

### Installation

```bash
npm install @mojaloop/inter-scheme-proxy-cache-lib
```

### Basic Usage

```typescript
// ESM
import { createProxyCache, STORAGE_TYPES } from '@mojaloop/inter-scheme-proxy-cache-lib';
// CJS
const { createProxyCache } = require('@mojaloop/inter-scheme-proxy-cache-lib');

// Redis Cluster
const proxyCacheCluster = createProxyCache(STORAGE_TYPES.redisCluster, {
  cluster: [
    { host: 'localhost', port: 6379 },
    { host: 'localhost', port: 6380 },
    { host: 'localhost', port: 6381 },
  ],
  // Optional: username, password, etc.
});

// Single Redis instance
const proxyCache = createProxyCache(STORAGE_TYPES.redis, {
  host: 'localhost',
  port: 6379,
  // Optional: username, password, db, etc.
});

await proxyCache.connect();

// Basic DFSP to proxy mapping
await proxyCache.addDfspIdToProxyMapping('dfsp_1', 'proxyAB');
const proxyId = await proxyCache.lookupProxyByDfspId('dfsp_1');
```

---
### API docs
Check [_IProxyCache_](https://mojaloop.github.io/inter-scheme-proxy-cache-lib/interfaces/IProxyCache.html) interface docs to get more details.

Comprehensive and interactive API documentation, based on TypeScript source code of the package,
could be found [**here**](https://mojaloop.github.io/inter-scheme-proxy-cache-lib)

### Configuration

#### Storage Types
The library supports the following storage types:

- `STORAGE_TYPES.redis` - Single Redis instance
- `STORAGE_TYPES.redisCluster` - Redis cluster configuration
- `STORAGE_TYPES.mysql` - MySQL storage (not implemented yet)

#### Environment Variables
| Env Variable Name           | Default Value | Description                        |
|-----------------------------|---------------|------------------------------------|
| PROXY_CACHE_LOG_LEVEL       | `warn`        | The log level for the proxyCache |
| PROXY_CACHE_DEFAULT_TTL_SEC | `20`          | Default cache TTL for sendToProxiesList keys |


### Requirements

- Node.js >= 22.15.0

---
## Development

### Build

Command to transpile Typescript into JS:

```bash
npm run build
```

### Tests

```bash
npm test
```

### Generate Typedoc documentation

```bash
npm run docs
```

## Collaborators

- [Eugen Klymniuk](https://github.com/geka-evk)