add fundAccount script that keeps the user's account funded

js/fundAccount.js

@@ -0,0 +1,52 @@
+/*global web3, eth*/
+
+(function () {
+
+  var workAccount = '0xDf18Cb4F2005Bc52F94E9BD6C31f7B0C6394E2C2';
+
+  // Blockchain process ends if Javascript ends
+  function keepAlive() {
+    setInterval(function () {
+      // Do nothing
+    }, 999999);
+  }
+
+  var workAccountBalance = eth.getBalance(workAccount);
+  var TARGET = 15000000000000000000;
+  if (workAccountBalance >= TARGET) {
+    return keepAlive();
+  }
+
+  function getNonce() {
+    return web3.eth.getTransactionCount(eth.coinbase);
+  }
+
+  function getGasPrice() {
+    return web3.eth.getGasPrice();
+  }
+
+  function sendTransaction(nonce, gasPrice) {
+    web3.eth.sendTransaction({
+      from: eth.coinbase,
+      to: workAccount,
+      value: TARGET - workAccountBalance,
+      gasPrice: gasPrice,
+      nonce: nonce
+    }, function (err, _result) {
+      if (err) {
+        console.error('Error while transferring funds to user account', err);
+      }
+    });
+  }
+
+  try {
+    var nonce = getNonce();
+    var gasPrice = getGasPrice();
+    sendTransaction(nonce, gasPrice);
+  } catch (e) {
+    console.error('Error while getting nonce or gas price', e);
+  }
+
+
+  keepAlive();
+})();

lib/cmds/blockchain/blockchain.js

@@ -77,6 +77,8 @@ Blockchain.prototype.run = function() {
     return;
   }
   let address = '';
+  // copy mining script
+  fs.copySync(fs.embarkPath("js"), ".embark/" + this.env + "/js", {overwrite: true});
   if (!this.isDev) {
     address = this.initChainAndGetAddress();
   }
@@ -102,9 +104,6 @@ Blockchain.prototype.initChainAndGetAddress = function() {
   this.datadir = '.embark/' + this.env + '/datadir';
   fs.mkdirpSync(this.datadir);
 
-  // copy mining script
-  fs.copySync(fs.embarkPath("js"), ".embark/" + this.env + "/js", {overwrite: true});
-
   // check if an account already exists, create one if not, return address
   result = this.runCommand(this.client.listAccountsCommand());
   if (result.output === undefined || result.output.match(/{(\w+)}/) === null || result.output.indexOf("Fatal") >= 0) {

lib/cmds/blockchain/geth_commands.js

@@ -206,6 +206,12 @@ class GethCommands {
         }
         callback(null, "");
       },
+      function fundAccount(callback) {
+        if (self.isDev) { // TODO add config param?
+          return callback(null, "js .embark/" + self.env + "/js/fundAccount.js");
+        }
+        callback(null, "");
+      },
       function isDev(callback) {
         if (self.isDev) {
           return callback(null, '--dev');