Improve UI gas calculation logic

- Now striping hex prefixed gas values, which may have been causing mis-estimation.
- Unified calculation logic to be entirely functional.
- Greatly simplified how the pending-tx form keeps updated form state.

Still needs a commit from @kumavis to ensure the background passes in a txMeta.txParams.gasPrice value.

1 files changed, 7 insertions, 0 deletions

diff --git a/app/scripts/lib/hex-to-bn.js b/app/scripts/lib/hex-to-bn.js
new file mode 100644
index 000000000..184217279
--- /dev/null
+++ b/app/scripts/lib/hex-to-bn.js
@@ -0,0 +1,7 @@
+const ethUtil = require('ethereumjs-util')
+const BN = ethUtil.BN
+
+module.exports = function hexToBn (hex) {
+  return new BN(ethUtil.stripHexPrefix(hex), 16)
+}
+