Merge pull request #368 from SwiftyLimi/develop

Added Promise: Support for getCode function

Author: zkToha

Sources/web3swift/Promises/Promise+Web3+Eth+GetCode.swift

@@ -0,0 +1,33 @@
+//
+//  Promise+Web3+Eth+GetCode.swift
+//  web3swift
+//
+//  Created by Ndriqim Haxhaj on 8/25/21.
+//
+
+import Foundation
+import PromiseKit
+import BigInt
+
+extension web3.Eth {
+    public func getCodePromise(address: EthereumAddress, onBlock: String = "latest") -> Promise<String> {
+        let addr = address.address
+        return getCodePromise(address: addr, onBlock: onBlock)
+    }
+    public func getCodePromise(address: String, onBlock: String = "latest") -> Promise<String> {
+        let request = JSONRPCRequestFabric.prepareRequest(.getCode, parameters: [address.lowercased(), onBlock])
+        let rp = web3.dispatch(request)
+        let queue = web3.requestDispatcher.queue
+        return rp.map(on: queue ) { response in
+            guard let value: String = response.getValue() else {
+                if response.error != nil {
+                    throw Web3Error.nodeError(desc: response.error!.message)
+                }
+                throw Web3Error.nodeError(desc: "Invalid value from Ethereum node")
+            }
+            return value
+        }
+    }
+}
+
+