Function read_export_request 

pub(crate) async fn read_export_request(
    socket: &mut WebSocket,
) -> Result<ExportRequest>

Reads the initial JSON export request from a WebSocket.

The first message must be a text message holding an ExportRequest. If it is any other message type, an error frame with expected JSON request is sent first.

Arguments

• socket - WebSocket to read from.

Errors

Returns an error if the socket closes or fails before a message arrives, if the first message is not text, or if the text is not a valid ExportRequest.