From 6bbdc98ba29633828f0533c8bb40a200cf142436 Mon Sep 17 00:00:00 2001
From: Leonid Logvinov <logvinov.leon@gmail.com>
Date: Tue, 3 Oct 2017 12:31:46 +0300
Subject: Move log decoding to AbiDecoder

---
 src/0x.ts                | 23 ++---------------
 src/utils/abi_decoder.ts | 67 +++++++++++++++++++++++++-----------------------
 2 files changed, 37 insertions(+), 53 deletions(-)

diff --git a/src/0x.ts b/src/0x.ts
index 275689f30..d89c07aa6 100644
--- a/src/0x.ts
+++ b/src/0x.ts
@@ -302,7 +302,8 @@ export class ZeroEx {
                 const transactionReceipt = await this._web3Wrapper.getTransactionReceiptAsync(txHash);
                 if (!_.isNull(transactionReceipt)) {
                     intervalUtils.clearAsyncExcludingInterval(intervalId);
-                    const logsWithDecodedArgs = _.map(transactionReceipt.logs, this.tryToDecodeLogOrNoOp.bind(this));
+                    const tryToDecodeLogOrNoOp = this._abiDecoder.tryToDecodeLogOrNoOp.bind(this._abiDecoder);
+                    const logsWithDecodedArgs = _.map(transactionReceipt.logs, tryToDecodeLogOrNoOp);
                     const transactionReceiptWithDecodedLogArgs: TransactionReceiptWithDecodedLogs = {
                         ...transactionReceipt,
                         logs: logsWithDecodedArgs,
@@ -313,26 +314,6 @@ export class ZeroEx {
         });
         return txReceiptPromise;
     }
-    /**
-     * Gets historical logs without creating a subscription
-     * @param   filter            Filter object
-     * @return  Array of logs that match the filter
-     */
-    public async getLogsAsync(filter: FilterObject): Promise<RawLog[]> {
-        const logs = await this._web3Wrapper.getLogsAsync(filter);
-        return logs;
-    }
-    private tryToDecodeLogOrNoOp(log: Web3.LogEntry): LogWithDecodedArgs|Web3.LogEntry {
-        const decodedLog = this._abiDecoder.decodeLog(log);
-        if (_.isUndefined(decodedLog)) {
-            return log;
-        }
-        const logWithDecodedArgs: LogWithDecodedArgs = {
-            ...log,
-            ...decodedLog,
-        };
-        return logWithDecodedArgs;
-    }
     /*
      * HACK: `TokenWrapper` needs a token transfer proxy address. `TokenTransferProxy` address is fetched from
      * an `ExchangeWrapper`. `ExchangeWrapper` needs `TokenWrapper` to validate orders, creating a dependency cycle.
diff --git a/src/utils/abi_decoder.ts b/src/utils/abi_decoder.ts
index 61c8eecd4..88053aade 100644
--- a/src/utils/abi_decoder.ts
+++ b/src/utils/abi_decoder.ts
@@ -1,7 +1,7 @@
 import * as Web3 from 'web3';
 import * as _ from 'lodash';
 import * as BigNumber from 'bignumber.js';
-import {AbiType, DecodedLogArgs, DecodedArgs} from '../types';
+import {AbiType, DecodedLogArgs, DecodedArgs, LogWithDecodedArgs} from '../types';
 import * as SolidityCoder from 'web3/lib/solidity/coder';
 
 export class AbiDecoder {
@@ -10,40 +10,43 @@ export class AbiDecoder {
     constructor(abiArrays: Web3.AbiDefinition[][]) {
         _.map(abiArrays, this.addABI.bind(this));
     }
-    public decodeLog(logItem: Web3.LogEntry): DecodedArgs|undefined {
-        const methodId = logItem.topics[0];
+    public tryToDecodeLogOrNoOp(log: Web3.LogEntry): LogWithDecodedArgs|Web3.LogEntry {
+        const methodId = log.topics[0];
         const event = this.methodIds[methodId];
-        if (!_.isUndefined(event)) {
-            const logData = logItem.data;
-            const decodedParams: DecodedLogArgs = {};
-            let dataIndex = 0;
-            let topicsIndex = 1;
+        if (_.isUndefined(event)) {
+            return log;
+        }
+        const logData = log.data;
+        const decodedParams: DecodedLogArgs = {};
+        let dataIndex = 0;
+        let topicsIndex = 1;
 
-            const nonIndexedInputs = _.filter(event.inputs, input => !input.indexed);
-            const dataTypes = _.map(nonIndexedInputs, input => input.type);
-            const decodedData = SolidityCoder.decodeParams(dataTypes, logData.slice(2));
-            _.map(event.inputs, (param: Web3.EventParameter) => {
-                let value;
-                if (param.indexed) {
-                    value = logItem.topics[topicsIndex];
-                    topicsIndex++;
-                } else {
-                    value = decodedData[dataIndex];
-                    dataIndex++;
-                }
-                if (param.type === 'address') {
-                    value = this.padZeros(new BigNumber(value).toString(16));
-                } else if (param.type === 'uint256' || param.type === 'uint8' || param.type === 'int' ) {
-                    value = new BigNumber(value);
-                }
-                decodedParams[param.name] = value;
-            });
+        const nonIndexedInputs = _.filter(event.inputs, input => !input.indexed);
+        const dataTypes = _.map(nonIndexedInputs, input => input.type);
+        const decodedData = SolidityCoder.decodeParams(dataTypes, logData.slice(2));
 
-            return {
-                event: event.name,
-                args: decodedParams,
-            };
-        }
+        _.map(event.inputs, (param: Web3.EventParameter) => {
+            let value;
+            if (param.indexed) {
+                value = log.topics[topicsIndex];
+                topicsIndex++;
+            } else {
+                value = decodedData[dataIndex];
+                dataIndex++;
+            }
+            if (param.type === 'address') {
+                value = this.padZeros(new BigNumber(value).toString(16));
+            } else if (param.type === 'uint256' || param.type === 'uint8' || param.type === 'int' ) {
+                value = new BigNumber(value);
+            }
+            decodedParams[param.name] = value;
+        });
+
+        return {
+            ...log,
+            event: event.name,
+            args: decodedParams,
+        };
     }
     private addABI(abiArray: Web3.AbiDefinition[]): void {
         _.map(abiArray, (abi: Web3.AbiDefinition) => {
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