Xcode/macos Binance Api Client for websocket using CoreData and Starscream

no unit tests so far, i've tested a few combinations of endpoint.

depths not supported so far. depths implemented. be aware that the partial book depth stream does not conform to the other events. for starters it does not have a symbol, which when stored in a database might lead to confusion. so if you use this to keep your order book updated, maybe flush the table before

does not (really) detect if the same data has already been loaded. not sure how to set the constraints. sometimes we have ids, sometimes we have ranges of ids with an interval size.

clone the project, put BinanceWSApi.xcodeproj in your project, include BinanceWSApi.framework in your linker (Project/Build Phases/Link Binary With Libraries).

your app should manage core data. when initialising core data in your appdelegate. add this to the core data stack:

lazy var managedObjectModel: NSManagedObjectModel = {
    // required to get the model from framework
    let bundle = Bundle(identifier: "de.cbret.BinanceWSApi")
    let modelURL = bundle!.url(forResource: "BinanceWSApi", withExtension: "momd")!
    return NSManagedObjectModel(contentsOf: modelURL)!
}()

and change the container declaration in the persistentController declaration to this:

    let container = NSPersistentContainer(name: "BinanceWSApi", managedObjectModel: self.managedObjectModel)

that will associate the core data stack with the BinanceWSApi data model. the name of the container can be anything you want the sqlite file on disk be called.

create an instance:

    binanceticker = BinanceWSApi(streams: ["ethbtc@kline_1h", "neobtc@aggTrade", "omgeth@depth"], context:appDelegate.persistentContainer.viewContext)

as for the streams, see the binance documentation at: https://github.com/binance-exchange/binance-official-api-docs/blob/master/web-socket-streams.md