CoinbaseSocketSwift

Features

• WebSocket library agnostic (use any library you like! the example uses Starscream)
• Minimal Swift codebase with all JSON parsing handled internally
• Objects for all outgoing and incoming channel JSON
• Optional automatic request signing when subscribing to channels

Please read over the official Coinbase Pro documentation before using this library.

This library was inspired by GDAXSwift and is a continuation of GDAXSocketSwift.

Requirements

• iOS 8.1+ / macOS 10.13+ / tvOS 9.0+ / watchOS 4.0+
• Xcode 9.0+
• Swift 4.0+

Installation

CoinbaseSocketSwift is available through CocoaPods. Check out Get Started tab on cocoapods.org to learn more.

To install CoinbaseSocketSwift, simply add the following line to your Podfile:

pod 'CoinbaseSocketSwift'

Then run:

pod install

Usage

Import

First thing is to import the framework. See the Installation instructions above how to add the framework to your project using CocoaPods.

import CoinbaseSocketSwift

Initialize

Create an instance of CoinbaseSocketClient using the available initializer. Note that it is probably best to use a property, so it doesn't get deallocated right after being setup.

The apiKey, secret64, and passphrase parameters are optional if you want to receive authenticated messages. Read the official Coinbase Pro documentation for more details on authenticated WebSocket messages.

socketClient = CoinbaseSocketClient(apiKey: "apiKey", secret64: "secret64", passphrase: "passphrase")

Setup WebSocket

CoinbaseSocketSwift is made to be used with any WebSocket library. As such, a class that conforms to the protocol CoinbaseWebSocketClient must be passed in to CoinbaseSocketClient. CoinbaseSocketClient keeps a strong reference to this socket class and handles connecting, disconnecting, receiving messages, and connection status. Check out the example project to see how to do this with Starscream.

socketClient.webSocket = ExampleWebSocketClient(url: URL(string: CoinbaseSocketClient.baseProAPIURLString)!)

Setup Logger (optional)

If you want to see logs from CoinbaseSocketSwift you can optionally pass a class that conforms to the protocol CoinbaseSocketClientLogger. A CoinbaseSocketClientDefaultLogger is provided with an example of basic logging.

socketClient?.logger = CoinbaseSocketClientDefaultLogger()

Setup Delegate

Finally, set a class to receive the delegate calls.

socketClient?.delegate = self

Then you can create an extension and implement the delegate methods. The delegate methods are optional (by way of empty default implementations).

extension ViewController: CoinbaseSocketClientDelegate {
	func coinbaseSocketDidConnect(socket: CoinbaseSocketClient) {
		socket.subscribe(channels:[.ticker], productIds:[.BTCUSD])
	}

	func coinbaseSocketDidDisconnect(socket: CoinbaseSocketClient, error: Error?) {

	}

	func coinbaseSocketClientOnErrorMessage(socket: CoinbaseSocketClient, error: ErrorMessage) {
		print(error.message)
	}

	func coinbaseSocketClientOnTicker(socket: CoinbaseSocketClient, ticker: TickerMessage) {
		let formattedPrice = priceFormatter.string(from: ticker.price as NSNumber) ?? "0.0000"
		self.tickerLabel.text = ticker.type.rawValue
		self.priceLabel.text = "Price = " + formattedPrice
		self.productIdLabel.text = ticker.productId.rawValue

		if let time = ticker.time {
			self.timeLabel.text = timeFormatter.string(from: time)
		} else {
			self.timeLabel.text = timeFormatter.string(from: Date())
		}
	}
}

Example

To run the example project, clone the repo, and run pod install from the Example directory first.

TODOs

• Tests...

Author

Hani Shabsigh, LinkedIn, GitHub

License

CoinbaseSocketSwift is available under the MIT license. See the LICENSE file for more info.

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