prevent double firing of cb on contract.new race condition

Author: frozeman

dist/web3-light.js

@@ -105,11 +105,12 @@ var contract = function (abi) {
  * @returns {Undefined}
  */
 var checkForContractAddress = function(contract, abi, callback){
-    var count = 0;
+    var count = 0,
+        callbackFired = false;
 
     // wait for receipt
     var filter = web3.eth.filter('latest', function(e){
-        if(!e) {
+        if(!e && !callbackFired) {
             count++;
 
             // console.log('Checking for contract address', count);
@@ -118,6 +119,7 @@ var checkForContractAddress = function(contract, abi, callback){
             if(count > 50) {
 
                 filter.stopWatching();
+                callbackFired = true;
 
                 if(callback)
                     callback(new Error('Contract transaction couldn\'t be found after 50 blocks'));
@@ -128,11 +130,15 @@ var checkForContractAddress = function(contract, abi, callback){
             } else {
 
                 web3.eth.getTransactionReceipt(contract.transactionHash, function(e, receipt){
-                    if(receipt) {
+                    if(receipt && !callbackFired) {
 
                         web3.eth.getCode(receipt.contractAddress, function(e, code){
+
+                            if(callbackFired)
+                                return;
 
                             filter.stopWatching();
+                            callbackFired = true;
 
                             if(code.length > 2) {