fix webserver errors

lib/contracts/provider.js

@@ -28,6 +28,7 @@ class Provider {
 
     self.accounts = AccountParser.parseAccountsConfig(self.accountsConfig, self.web3, self.logger);
     self.addresses = [];
+
     if (!self.accounts.length) {
       return callback();
     }
@@ -35,32 +36,35 @@ class Provider {
       self.addresses.push(account.address);
       self.web3.eth.accounts.wallet.add(account);
     });
-
     self.web3.eth.defaultAccount = self.addresses[0];
-    const realAccountFunction = self.web3.eth.getAccounts;
+    const realSend = self.provider.send.bind(self.provider);
-    self.web3.eth.getAccounts = function (cb) {
+    self.provider.send = function (payload, cb) {
-      cb = cb || function () {};
+      if (payload.method === 'eth_accounts') {
-      return new Promise((resolve, reject) => {
+        return realSend(payload, function (err, result) {
-        realAccountFunction((err, accounts) => {
           if (err) {
-            cb(err);
+            return cb(err);
-            return reject(err);
           }
-          // console.log('ACOUNTS', accounts);
+          result.result = result.result.concat(self.addresses);
-          // console.log('My addresses', self.addresses);
+          cb(null, result);
-          // accounts = self.addresses;
-          accounts = [accounts[0]].concat(self.addresses);
-          // accounts = accounts.concat(self.addresses);
-          // accounts = self.addresses.concat(accounts);
-          cb(null, accounts);
-          resolve(accounts);
-        });
         });
+      }
+      realSend(payload, cb);
     };
 
     callback();
   }
 
+  stop() {
+    if (this.provider && this.provider.removeAllListeners) {
+      this.provider.removeAllListeners('connect');
+      this.provider.removeAllListeners('error');
+      this.provider.removeAllListeners('end');
+      this.provider.removeAllListeners('data');
+      this.provider.responseCallbacks = {};
+      this.provider = null;
+    }
+  }
+
   fundAccounts(callback) {
     const self = this;
     if (!self.accounts.length) {

test_apps/test_app/config/contracts.js

@@ -2,8 +2,8 @@ module.exports = {
   default: {
     deployment: {
       host: "localhost",
-      port: 8545,
+      port: 8546,
-      type: "rpc"
+      type: "ws"
     },
     dappConnection: [
       "$WEB3",