cabal-club/cable-client.js

p2p chat client library for the cable protocol

cable-client

Status: alpha (api surface still in flux)

cable-client is a client library for implementing chat clients running the cable protocol

New chat clients may be implemented using solely this library, without having to interface directly with the lower level cable-core library.

Responsibilities:

• Provides networking primitives (currently: tcp, hyperswarm (experimental), lan transport (experimental))
• Provides a clean api for implementing a chat client, including causal message ordering using cable's links concept
• Internally manages all messages needed for synchronizing over cable

Non-responsibilities:

• Does not handle serializing & deserializing cable's binary buffers (cable.js does that)
• Does not provide lower-level methods for cable message/post creation nor interacting with database indexes (cable-core does that)

Some of its features:

• Consolidates logic common to all chat clients, like retrieving and ordering a range of posts for a particular channel
• Leaving and joining of channels, setting topics
• Deletion of one's own posts
• Virtual messages, such as status messages or rendering usage instructions for different commands

Usage

See cabal@cable for an example client implementation.

// shim.js is an adaptor between the new cable-client (which has slight changes) and the old cabal-client api
// to facilitate an interim transition period for cabal clients as they update to the cable wire protocol
var Client = require('cable-client/shim.js').Client

const client = new Client({
  config: {
  config: {
    keypair,        // the keypair to use
    dbdir: "/tmp/cabals",
    temp: true,
    serve: true,    // set to true if serving / listening for connections over tcp
    disableDHT: true,
    disableTCP: false,
    disableLAN: true,
    ip: "",         // only needed when connecting to a serving tcp instance; set ip or domain name
    dhtPort: null,  // default port is 13331
    lanPort: null,  // default lan port is 13332
    tcpPort: null   // default tcp port is 13333
  },
  }
})

client.createCabal()
  .then((cabal) => {
    // resolves when the cabal is ready, returns a CableClient instance
  })

Concepts

cable-client has two abstractions: CableClient and ChannelDetails.

CableClient is the instance that clients mostly operate on, as it encapsulates all information for a particular cabal. (joined channels, users in that channel, the topic). It also emits events.

When a change has happened, a CableClient instance will emit an update event. When a client receives this event, they should update their state & rerender.

ChannelDetails encapsulates everything channels (mentions in that channel, status messages for the channel (like having called a command eg /names, when it was last read, if it's currently being viewed, if it's joined and so on). It also has a barebones implementation for virtual channels, channels which can contain status messages that are not replicated outside the local client.

Transitioning from the old cabal-client library

Clients that have yet to transition from the old cabal-client library may start their refactor to running cable-client by opting to use the adaptor shim.js:

require('cable-client/shim.js').Client
const client = new Client({..})

The shim acts as a translation layer between the two APIs as well as a guide to what has been changed, check out the code.

Install

With npm installed, run

$ npm install cable-client

License

AGPL-3.0-or-later