Merge pull request #20 from medhatiwari/issue-18

#18 code for funcion getAbi()

lib/contract_linking.dart

@@ -1,7 +1,12 @@
 import 'package:flutter/material.dart';
+import 'package:http/http.dart';
+import 'package:web3dart/web3dart.dart';
+import 'package:web_socket_channel/io.dart';
+import 'dart:convert';
+import 'package:flutter/services.dart';
+import 'package:flutter/cupertino.dart';
 
 class ContractLinking extends ChangeNotifier {
-
   final String _rpcUrl = "http://10.0.2.2:7545";
   final String _wsUrl = "ws://10.0.2.2:7545/";
   final String _privateKey = " Private Key :) ";
@@ -10,15 +15,50 @@ class ContractLinking extends ChangeNotifier {
 
   String _abiCode;
   EthereumAddress _contractAddress;
-  EthreumAddress _ownerAddress;
+  EthereumAddress _ownerAddress;
 
   Credentials _credentials;
-
+  DeployedContract _contract;
+
   ContractFunction _bidderName;
   ContractFunction _bidAmount;
   ContractFunction _minAmount;
   ContractFunction _setBidder;
   ContractFunction _minBid;
+
+  initialSetup() async {
+    _client = Web3Client(_rpcUrl, Client(), socketConnector: () {
+      return IOWebSocketChannel.connect(_wsUrl).cast<String>();
+    });
+
+    await getAbi();
+    await getCredentials();
+    await getDeployedContract();
+  }
+
+  Future<void> getAbi() async {
+    String abiFile = await rootBundle.loadString("src/artifacts/Bidder.json");
+    var jsonAbi = jsonDecode(abiFile);
+    _abiCode = jsonEncode(jsonAbi["abi"]);
+
+    _contractAddress =
+      EthereumAddress.fromHex(jsonAbi["networks"]["5777"]["address"]);
+  }
+
+
+  Future<void> getCredentials() async {
+    _credentials = await _client.credentialsFromPrivateKey(_privateKey);
+    _ownerAddress = await _credentials.extractAddress();
+  }
+
+  Future<void> getDeployedContract() async {
+    _contract = DeployedContract(ContractAbi.fromJson(_abiCode, "Bidder"), _contractAddress);
+
+    _bidderName = _contract.function("bidderName");
+    _bidAmount = _contract.function("bidAmount");
+    _minAmount = _contract.function("minBid");
+    _setBidder = _contract.function("setBidder");
+  }
 }