dd-cache-proxy

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A simple, easy-to-use, highly customizable cache proxy for discordeno which supports in-memory and outside memory caching with custom properties you wish to cache.

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// repository documentation

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# Discordeno Cache Proxy (dd-cache-proxy)

A simple, easy-to-use, highly customizable cache proxy for [discordeno](https://github.com/discordeno) which supports in-memory and outside memory caching with custom properties you wish to cache.

Initially forked from [cache-proxy](https://github.com/discordeno/cache-proxy), but modified to be a proper, minimal, non-bloated cache proxy that aims to fit larger bots.

Used In:

-   [Giveaway Boat](https://giveaway.boats)
-   [Booster Bot](https://boosterbot.xyz)
-   [Greed](https://greed.best)
-   Contact [me](https://github.com/AwesomeStickz#contact-me) if you'd like to add your bot here!

## Example Usage:

```js
import { createProxyCache } from 'dd-cache-proxy';
import { createBot, Bot, Intents, createDesiredPropertiesObject, DesiredPropertiesBehavior } from '@discordeno/bot';

// Fill your discordeno desired properties here. This can have more properties than you'd like to store in your cache, as you can provide those properties later separately.
// Check here - https://discordeno.js.org/desired-props to learn more about discordeno's desired properties.
const desiredProperties = createDesiredPropertiesObject({});

// This will be needed to provide the type for the bot parameter of our function.
interface BotDesiredProperties extends Required<typeof desiredProperties> {}

// Create a function for easier use and cleaner code.
const getProxyCacheBot = (bot: Bot<BotDesiredProperties, DesiredPropertiesBehavior.RemoveKey>) =>
    createProxyCache(bot, {
        // Define what properties of individual cache you wish to cache. This property must also be in your discordeno's desired properties.
        // Caches all props from discordeno's desired props by default. Or you can use the `undesiredProps` prop to reverse the behavior of `desiredProps`.
        desiredProps: {
            // Example props that are cached in channels and other cache. Accepts an array of props of the cache. All props are optional.
            guild: ['channels', 'icon', 'id', 'name', 'roles'],
            user: ['avatar', 'id', 'username'],
        },
        // Define what to cache in memory. By default, all props inside `cacheInMemory` are set to `true`.
        cacheInMemory: {
            // Whether or not to cache guilds.
            guild: true,
            channel: true,
            // Default value for the properties that are not provided inside `cacheInMemory`.
            default: false,
        },
        // Define what to cache outside memory. By default, all props inside `cacheOutsideMemory` are set to `false`.
        cacheOutsideMemory: {
            // Whether or not to cache channels.
            channel: false,
            role: false,
            // Default value for the properties that are not provided inside `cacheOutsideMemory`.
            default: true,
        },
        // Function to set an item into the outside memory cache.
        // `getItem`, `setItem`, `removeItem` must be provided if you cache outside memory. Otherwise, you can omit these.
        setItem: (table, item) => {
            if (table === 'channel') {
                // Custom code to store data into your cache outside memory, say redis or a database or whichever you use.
            }
        },
    });

// Pass the created bot object to `getProxyCacheBot` so it can add the cache proxy to it.
const bot = getProxyCacheBot(
    // Create the bot object.
    createBot({
        token,
        desiredProperties,
        intents: Intents.Guilds,
    })
);
```

## Get guild from cache:

```js
await bot.cache.guilds.get(guildId);
```

Each cache will be in their own property under `bot.cache` and each of them have the following methods: `delete`, `get`, `set`, usage of these should be self explanatory from intellisense. If you cache in memory and need access to the collection directly, you can use `bot.cache.guilds.memory`, this will return a collection.

## Types Support:

The types of cached objects change based on the provided `desiredProperties` and `undesiredProperties`, so only the stored properties will appear in your intelliSense, making the package easier to use.

These types are also exposed under `bot.cache.$inferredTypes`, and if you wish, you can export them as with a custom name for ease of use, like:

```ts
export type CachedGuild = typeof bot.cache.$inferredTypes.guild;
```

Now you can import `CachedGuild` in your code and use it.

# **Important Things To Note:**

-   Make sure to include the correct `bot.transformers.desiredProperties` somewhere in your code, this must include at least **all** the properties from `bot.cache.options.desiredProps` for it to cache all those properties you want to cache.
-   It's not recommended to dynamically change `bot.cache.options.cacheInMemory` or `bot.cache.options.cacheOutsideMemory` since it may not cache newly added cache if events for that isn't setup. If you need to do so, you need to manually rerun the `setupDummyEvents` function.
    -   You should also avoid directly replacing `bot.events` (like `bot.events = { ready: ReadyFunction }`) since it'll override the dummy events setup by the cache proxy, which may make it unable to cache data. Instead, assign to individual event properties, like `bot.events.ready = ReadyFunction`, `bot.events.messageCreate = MessageCreateFunction` etc.

# Useful Options To Note:

### `options.cacheScope`:

This options allows you to tell the cache proxy where to cache an object. Return `0` to not cache it, `1` to cache in memory, `2` to cache outside memory, `3` to cache in both memory and outside memory.

Example:

```js
import { CacheScope } from 'dd-cache-proxy';

cacheScope: {
    channel: async (channelId, channel) => {
        // If it's a guild channel, cache in both memory and outside memory
        if (channel.guildId) return CacheScope.MemoryAndOutsideMemory;
        // Otherwise, do not cache it
        return CacheScope.DoNotCache;
    },
    member: async (memberId) => {
        // If it's bot member, cache in both memory and outside memory
        if (memberId === bot.id) return CacheScope.MemoryAndOutsideMemory;
        // Otherwise, cache only in memory
        return CacheScope.Memory;
    }
}
```

Note: In these functions, object id (first parameter) is always passed in all three functions (get, set, and delete) but the object (second parameter) itself is only passed in set() function.

### `options.bulk`:

This option allows you to specify how to handle the removal of objects that may trigger bulk modifications or deletions of associated objects.

For example, if you store guild channels individually in a database separate from the guild itself, deleting a guild could result in each channel being deleted one by one through individual queries. This method can be inefficient, especially as the number of channels increases. To improve permformance, you can use `options.bulk.removeGuild` to remove the guild and all associated channels in a single query.

This provides the following props: (should be self explanatory with intellisense)

-   `options.bulk.removeChannel`
-   `options.bulk.removeGuild`
-   `options.bulk.removeRole`
-   `options.bulk.replaceInternalBulkRemover` - To set props under this prop to tell the cache proxy whether or not to run internal bulk removers.

#### Note: If you cache outside memory, you must handle bulk removals yourself, otherwise they will **NOT** be deleted. The following are the bulk remover functions and the actions they should perform:

-   `removeChannel` - This should remove the channel and all the thread channels that are in this channel.
-   `removeGuild` - This should remove the guild, all the channels, members, roles that are in this guild.
-   `removeRole` - This should remove the role and remove it from the role list of every member who has it.

### `options.guildMutators`:

This option allows you to edit guild data without fetching the entire guild object, such as incrementing or decrementing the member count when a member joins or leaves a guild. This allows for performance optimization by avoiding the need to fetch and update the entire guild object for simple modifications, thus reducing overhead and improving efficiency when caching outside memory.

This provides the following props: (should be self explanatory with intellisense)

-  `options.guildMutators.incrementMemberCount`
-  `options.guildMutators.decrementMemberCount`
-  `options.guildMutators.replaceInternalGuildMutators` - To set props under this prop to tell the cache proxy whether or not to run internal guild mutators.

#### Note: If you cache outside memory, you must handle guild data modifications yourself, otherwise they will **NOT** be modified. The following are the guild mutator functions and the actions they should perform:

-   `incrementMemberCount` - This should increment the member count of the guild by 1.
-   `decrementMemberCount` - This should decrement the member count of the guild by 1.

### `options.sweeper`:

This option allows you to specify options for sweeper. This works for in-memory cache only. For outside memory cache, you should implement your own sweeper.

This provides the following props:

-   `options.sweeper.interval`
-   `options.sweeper.filter`

#### `options.sweeper.interval`:

The interval (in milliseconds) at which the cache sweeper should run the provided filter functions.

#### `options.sweeper.filter`:

This option allows you to provide filter functions to decide which object to remove from cache and which to keep. Defaults to removing nothing from the cache, so you should provide your own filters if you enable cache sweeper.

Note: You can use the `lastInteractedTime` property in the object to implement an NRU (Not Recently Used) cache if you'd like. For example, if you'd like to only remove the members that aren't accessed in the last 15 minutes and isn't the bot member, you can do:

```js
sweeper: {
    // Run the sweeper every 5 minutes
    interval: 300000,
    filter: {
        member: (member) => {
            // Remove member from cache if it hasn't been accessed in the last 15 minutes and if the member isn't bot member
            if (Date.now() - member.lastInteractedTime > 900000 && member.id !== bot.id) return true;
            else return false;
        }
    }
}
```

# Questions / Support:

If you have any questions or require support, feel free to contact me (`@awesomestickz`) in the [discordeno server](https://discord.gg/ddeno).

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