fix(allevents): update decode logic to handle no topics (web3#1330)

* fix(allevents): update decode logic to handle no topics

* add tests

Author: marcusmolchany

lib/web3/allevents.js

@@ -50,7 +50,11 @@ AllSolidityEvents.prototype.encode = function (options) {
 
 AllSolidityEvents.prototype.decode = function (data) {
     data.data = data.data || '';
-    data.topics = data.topics || [];
+
+    if (!utils.isArray(data.topics) || !utils.isString(data.topics[0])) {
+        console.warn('cannot find event for log');
+        return data;
+    }
 
     var eventTopic = data.topics[0].slice(2);
     var match = this._json.filter(function (j) {

test/allevents.decode.js

@@ -0,0 +1,144 @@
+var chai = require('chai');
+var assert = chai.assert;
+var BigNumber = require('bignumber.js');
+var AllSolidityEvents = require('../lib/web3/allevents');
+var Web3 = require('../index');
+
+
+var name = 'event1';
+var address = '0x1234567890123456789012345678901234567890';
+
+var tests = [{
+    abi: {
+        name: name,
+        inputs: [{
+            name: 'a',
+            type: 'int',
+            indexed: false
+        }]
+    },
+    data: {
+        logIndex: '0x1',
+        transactionIndex: '0x10',
+        transactionHash: '0x1234567890',
+        address: address,
+        blockHash: '0x1234567890',
+        blockNumber: '0x1',
+        data: '0x' +
+            '0000000000000000000000000000000000000000000000000000000000000001' +
+            '0000000000000000000000000000000000000000000000000000000000000004',
+        topics: undefined,
+    },
+    expected: {
+        logIndex: '0x1',
+        transactionIndex: '0x10',
+        transactionHash: '0x1234567890',
+        address: address,
+        blockHash: '0x1234567890',
+        blockNumber: '0x1',
+        data: '0x' +
+            '0000000000000000000000000000000000000000000000000000000000000001' +
+            '0000000000000000000000000000000000000000000000000000000000000004',
+        topics: undefined,
+    }
+}, {
+    abi: {
+        name: name,
+        inputs: [{
+            name: 'a',
+            type: 'int',
+            indexed: false
+        }]
+    },
+    data: {
+        logIndex: '0x1',
+        transactionIndex: '0x10',
+        transactionHash: '0x1234567890',
+        address: address,
+        blockHash: '0x1234567890',
+        blockNumber: '0x1',
+        data: '0x' +
+            '0000000000000000000000000000000000000000000000000000000000000001' +
+            '0000000000000000000000000000000000000000000000000000000000000004',
+        topics: [],
+    },
+    expected: {
+        logIndex: '0x1',
+        transactionIndex: '0x10',
+        transactionHash: '0x1234567890',
+        address: address,
+        blockHash: '0x1234567890',
+        blockNumber: '0x1',
+        data: '0x' +
+            '0000000000000000000000000000000000000000000000000000000000000001' +
+            '0000000000000000000000000000000000000000000000000000000000000004',
+        topics: [],
+    }
+}, {
+    abi: {
+        name: name,
+        anonymous: true,
+        inputs: [{
+            name: 'a',
+            type: 'int',
+            indexed: false
+        }, {
+            name: 'b',
+            type: 'int',
+            indexed: true
+        }, {
+            name: 'c',
+            type: 'int',
+            indexed: false
+        }, {
+            name: 'd',
+            type: 'int',
+            indexed: true
+        }]
+    },
+    data: {
+        logIndex: '0x1',
+        transactionIndex: '0x10',
+        transactionHash: '0x1234567890',
+        address: address,
+        blockHash: '0x1234567890',
+        blockNumber: '0x1',
+        data: '0x' +
+            '0000000000000000000000000000000000000000000000000000000000000001' +
+            '0000000000000000000000000000000000000000000000000000000000000004',
+        topics: [
+            '0x000000000000000000000000000000000000000000000000000000000000000a',
+            '0x0000000000000000000000000000000000000000000000000000000000000010'
+        ]
+    },
+    expected: {
+        event: name,
+        args: {
+            a: new BigNumber(1),
+            b: new BigNumber(10),
+            c: new BigNumber(4),
+            d: new BigNumber(16)
+        },
+        logIndex: 1,
+        transactionIndex: 16,
+        transactionHash: '0x1234567890',
+        address: address,
+        blockHash: '0x1234567890',
+        blockNumber: 1
+    }
+}];
+
+describe('lib/web3/allevents', function () {
+    describe('decode', function () {
+        tests.forEach(function (test, index) {
+            it('test no: ' + index, function () {
+                var web3 = new Web3();
+                var allEvents = new AllSolidityEvents(web3, test.abi, address);
+
+                var result = allEvents.decode(test.data);
+                assert.deepEqual(result, test.expected);
+            });
+        });
+    });
+});
+