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Hornwitser 677512512e Replace socket.io with plain WebSocket

Replace socket.io with plain WebSocket using the ws library as it
doesn't really provide any useful tools over plain WebSocket when it
comes to implementing reliable communication that works across
reconnects.  The widespread browser support for WebSocket also means
it has little value to add for the web interface over WebSocket.

2020-03-22 02:10:54 +01:00

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Socket.io protocol

_{This document describes the protocol used between the master and
slaves, and unless you're developing Clusterio it's probably not going
to be very useful for you.}

The protocol is built on WebSocket and uses JSON encoded text messages to communicate to and from the master server. These messages contain the following three properties:

seq - integer - The sequence number of the message
type - string - The type of message
data - object - Message data

Handshake

Upon connecting to the WebSocket endpoint the server will respond with a hello message containing the master server version as the data. The client is then expected to send a register_slave or register_control message back depending on what kind of client it is. If the register operation is successful the master will reply with a ready message with an empty data payload.

Master hello data

version - string - The version of the master, e.g. "2.0.0".

Slave register_slave response data

agent - string - Human readable identifying the software connecting.
version - string - The protocol version of the slave, e.g. "2.0.0".
name - string - Name of the slave.
id - integer - ID of the slave.

Control `register_control repsonse data

agent - string - Human readable identifying the software connecting.
version - string - The protocol version of the control, e.g. "2.0.0".

Example handshake

// Server hello
({
    type: 'hello',
    data: {
        version: "2.0.0",
    }
})

// Client response
({
    type: 'register_slave',
    data: {
        agent: 'Clusterio Slave',
        version: "2.0.0",
        name: "Foo",
        id: 123,
    }
})

// Server repsonse
({
    type: 'ready',
    data: {}
})

Events

Events are messages send in one direction over the link, that the receiver is expected to act upon, but not make any replies (for that there's Requests. By convention a message types ending in *_event is an event. The data payload of an event consists solely of event specific properties.

See lib/link/messages.js for the recognized events and their contents.

Requests

Requests are messages which expects a response in return. They function a lot like HTTP requests except that both parties of a connection can inniate a request that is expected to be responded to. By convention message types ending in *_request is a request, and is expected to be replied to with a corresponding *_response message. If an error occured while processing the request an error response containing an error property in the data payload is sent instead.

*_response data

seq - integer - The seq number of the request message.
additional properties may be present depending on the type of request.

*_resopnse error data

seq - integer - The seq number of the request message.
error - string - Human readable text message describing the error.

See lib/link/messages.js for the recognized requests and their contents.

Closing the connection

The party that innitates the shut down of the connection should send a close message containing the reason for closing before disconnecting.

close data

reason - string - Reason for closing the connection

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