Master channels

Master channels are the interface that directly or indirectly interact with the user. Despite the first master channel of EFB (EFB Telegram Master) is written in a form of Telegram Bot, master channels can be written in many forms, such as:

  • A web app
  • A server that expose APIs to dedicated desktop and mobile clients
  • A chat bot on an existing IM
  • A server that compiles with a generic IM Protocol
  • A CLI client
  • Anything else you can think of…

Design guideline

When the master channel is implemented on an existing protocol or platform, as far as possible, while considering the user experience, a master channel should:

  • maintain one conversation thread per chat, indicating its name, source channel and type;
  • support all, if not most, types of messages defined in the framework, process and deliver messages between the user and slave channels;
  • support all, if not most, features of messages, including: targeted message reply, chat substitution in text (usually used in @ references), commands, etc. Master channel should be able to process incoming messages with such features, and send messages with such features to slave channels if applicable;
  • be able to invoke and process “additional features” offered by slave channels.

Optionally, a master channel can also support / identify vendor-specified information from certain slave channels.

../_images/master-channel-0.png

An example of an ideal design of a master channel, inspired by Telegram Desktop

Depends on your implementation, a master channel may probably needs to maintain a list of chats and messages, for presentation or other purposes.

Message delivery

Note that sometimes users may send messages outside of this EFB session, so that slave channels might provide a message has its author marked as “self”.

Implementation details

See EFBChannel.