From 1c177adca127d224307fda99c48ec6c2ee01df5d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Tomasz=20Drwi=C4=99ga?= <tomusdrw@users.noreply.github.com>
Date: Mon, 6 Mar 2017 15:56:20 +0100
Subject: [PATCH] Optimize signature for fallback function. (#4780) (#4784)

---
 js/src/abi/util/signature.js      | 3 ++-
 js/src/abi/util/signature.spec.js | 8 ++++----
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/js/src/abi/util/signature.js b/js/src/abi/util/signature.js
index ad2b7ca5b..0507ac4d4 100644
--- a/js/src/abi/util/signature.js
+++ b/js/src/abi/util/signature.js
@@ -21,8 +21,9 @@ export function eventSignature (eventName, params) {
   const { strName, name } = parseName(eventName);
   const types = (params || []).map(fromParamType).join(',');
   const id = `${strName}(${types})`;
+  const signature = strName ? keccak_256(id) : '';
 
-  return { id, name, signature: keccak_256(id) };
+  return { id, name, signature };
 }
 
 export function methodSignature (methodName, params) {
diff --git a/js/src/abi/util/signature.spec.js b/js/src/abi/util/signature.spec.js
index dfa81333f..d21732624 100644
--- a/js/src/abi/util/signature.spec.js
+++ b/js/src/abi/util/signature.spec.js
@@ -46,7 +46,7 @@ describe('abi/util/signature', () => {
       expect(eventSignature(undefined, [])).to.deep.equal({
         id: '()',
         name: undefined,
-        signature: '861731d50c3880a2ca1994d5ec287b94b2f4bd832a67d3e41c08177bdd5674fe'
+        signature: ''
       });
     });
 
@@ -54,7 +54,7 @@ describe('abi/util/signature', () => {
       expect(eventSignature(undefined, undefined)).to.deep.equal({
         id: '()',
         name: undefined,
-        signature: '861731d50c3880a2ca1994d5ec287b94b2f4bd832a67d3e41c08177bdd5674fe'
+        signature: ''
       });
     });
   });
@@ -96,7 +96,7 @@ describe('abi/util/signature', () => {
       expect(methodSignature(undefined, [])).to.deep.equal({
         id: '()',
         name: undefined,
-        signature: '861731d5'
+        signature: ''
       });
     });
 
@@ -104,7 +104,7 @@ describe('abi/util/signature', () => {
       expect(methodSignature(undefined, undefined)).to.deep.equal({
         id: '()',
         name: undefined,
-        signature: '861731d5'
+        signature: ''
       });
     });
   });