Merge pull request #361 from ethereum/checkgasblocklimit

src/app/txRunner.js

@@ -65,19 +65,24 @@ TxRunner.prototype.execute = function () {
         })
       })
     } else {
-      self.web3.eth.estimateGas(tx, function (err, resp) {
+      self.web3.eth.estimateGas(tx, function (err, gasEstimation) {
         if (err) {
-          return callback(err, resp)
+          return callback(err, gasEstimation)
         }
+        self.web3.eth.getBlock('latest', function (err, block) {
+          if (err) {
+            return callback(err)
+          } else {
+            // NOTE: estimateGas very likely will return a large limit if execution of the code failed
+            //       we want to be able to run the code in order to debug and find the cause for the failure
+            var blockGasLimit = Math.floor(block.gasLimit - block.gasLimit / 1024)
+            tx.gas = blockGasLimit < gasEstimation ? blockGasLimit : gasEstimation
 
-        if (resp > gasLimit) {
-          return callback('Gas required exceeds limit: ' + resp)
+            if (tx.gas > gasLimit) {
+              return callback('Gas required exceeds limit: ' + tx.gas)
             }
 
-        tx.gas = resp
-
             var sendTransaction = self.personalMode ? self.web3.personal.sendTransaction : self.web3.eth.sendTransaction
-
             sendTransaction(tx, function (err, resp) {
               if (err) {
                 return callback(err, resp)
@@ -85,6 +90,8 @@ TxRunner.prototype.execute = function () {
 
               tryTillResponse(self.web3, resp, callback)
             })
+          }
+        })
       })
     }
   } else {