From ff49e5e5cf3aadf63dbdf6570407c23e1ae6cdb9 Mon Sep 17 00:00:00 2001
From: kumavis <aaron@kumavis.me>
Date: Wed, 29 Mar 2017 23:21:31 -0700
Subject: [PATCH 1/2] tx-utils - gas buffer ceiling at 90% of block gas limit

---
 app/scripts/lib/tx-utils.js | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/app/scripts/lib/tx-utils.js b/app/scripts/lib/tx-utils.js
index 72df53631..e8e23f8b5 100644
--- a/app/scripts/lib/tx-utils.js
+++ b/app/scripts/lib/tx-utils.js
@@ -63,14 +63,15 @@ module.exports = class txProviderUtils {
   addGasBuffer (initialGasLimitHex, blockGasLimitHex) {
     const initialGasLimitBn = hexToBn(initialGasLimitHex)
     const blockGasLimitBn = hexToBn(blockGasLimitHex)
+    const upperGasLimitBn = blockGasLimitBn.muln(0.9)
     const bufferedGasLimitBn = initialGasLimitBn.muln(1.5)
 
     // if initialGasLimit is above blockGasLimit, dont modify it
-    if (initialGasLimitBn.gt(blockGasLimitBn)) return bnToHex(initialGasLimitBn)
+    if (initialGasLimitBn.gt(upperGasLimitBn)) return bnToHex(initialGasLimitBn)
     // if bufferedGasLimit is below blockGasLimit, use bufferedGasLimit
-    if (bufferedGasLimitBn.lt(blockGasLimitBn)) return bnToHex(bufferedGasLimitBn)
+    if (bufferedGasLimitBn.lt(upperGasLimitBn)) return bnToHex(bufferedGasLimitBn)
     // otherwise use blockGasLimit
-    return bnToHex(blockGasLimitBn)
+    return bnToHex(upperGasLimitBn)
   }
 
   fillInTxParams (txParams, cb) {

From 16b5f4a210cd496b9160efbfa5e2cc44ae0c8f5c Mon Sep 17 00:00:00 2001
From: kumavis <aaron@kumavis.me>
Date: Wed, 29 Mar 2017 23:59:42 -0700
Subject: [PATCH 2/2] tests - tx-utils gasBuffer calc - fix bug and user easier
 numbers

---
 test/unit/tx-utils-test.js | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

diff --git a/test/unit/tx-utils-test.js b/test/unit/tx-utils-test.js
index e57b25e83..8b4d2f059 100644
--- a/test/unit/tx-utils-test.js
+++ b/test/unit/tx-utils-test.js
@@ -14,8 +14,8 @@ describe('txUtils', function() {
 
   describe('addGasBuffer', function() {
     it('multiplies by 1.5, when within block gas limit', function() {
-      // naive estimatedGas: 0x123fad (~1.2 mil)
-      const inputHex = '0x123fad'
+      // naive estimatedGas: 0x16e360 (1.5 mil)
+      const inputHex = '0x16e360'
       // dummy gas limit: 0x3d4c52 (4 mil)
       const blockGasLimitHex = '0x3d4c52'
       const output = txUtils.addGasBuffer(inputHex, blockGasLimitHex)
@@ -26,8 +26,8 @@ describe('txUtils', function() {
     })
     
     it('uses original estimatedGas, when above block gas limit', function() {
-      // naive estimatedGas: 0x123fad (~1.2 mil)
-      const inputHex = '0x123fad'
+      // naive estimatedGas: 0x16e360 (1.5 mil)
+      const inputHex = '0x16e360'
       // dummy gas limit: 0x0f4240 (1 mil)
       const blockGasLimitHex = '0x0f4240'
       const output = txUtils.addGasBuffer(inputHex, blockGasLimitHex)
@@ -37,16 +37,18 @@ describe('txUtils', function() {
       assert(outputBn.eq(expectedBn), 'returns the original estimatedGas value')
     })
 
-    it('buffers up to block gas limit', function() {
-      // naive estimatedGas: 0x123fad (~1.2 mil)
-      const inputHex = '0x1e8480'
+    it('buffers up to reccomend gas limit reccomended ceiling', function() {
+      // naive estimatedGas: 0x16e360 (1.5 mil)
+      const inputHex = '0x16e360'
       // dummy gas limit: 0x1e8480 (2 mil)
       const blockGasLimitHex = '0x1e8480'
+      const blockGasLimitBn = hexToBn(blockGasLimitHex)
+      const ceilGasLimitBn = blockGasLimitBn.muln(0.9)
       const output = txUtils.addGasBuffer(inputHex, blockGasLimitHex)
-      const inputBn = hexToBn(inputHex)
-      const outputBn = hexToBn(output)
-      const expectedBn = hexToBn(blockGasLimitHex)
-      assert(outputBn.eq(expectedBn), 'returns the block gas limit value')
+      // const inputBn = hexToBn(inputHex)
+      // const outputBn = hexToBn(output)
+      const expectedHex = bnToHex(ceilGasLimitBn)
+      assert.equal(output, expectedHex, 'returns the gas limit reccomended ceiling value')
     })
   })
 })
@@ -55,4 +57,8 @@ describe('txUtils', function() {
 
 function hexToBn(inputHex) {
   return new BN(ethUtil.stripHexPrefix(inputHex), 16)
+}
+
+function bnToHex(inputBn) {
+  return ethUtil.addHexPrefix(inputBn.toString(16))
 }
\ No newline at end of file