Use web3-wrapper instead of 0x.js, update logDecoder

1 files changed, 21 insertions, 27 deletions

diff --git a/packages/contracts/src/utils/log_decoder.ts b/packages/contracts/src/utils/log_decoder.ts
index 747c7644d..d2e65d176 100644
--- a/packages/contracts/src/utils/log_decoder.ts
+++ b/packages/contracts/src/utils/log_decoder.ts
@@ -5,35 +5,29 @@ import * as _ from 'lodash';
 
 import { artifacts } from './artifacts';
 
-export class LogDecoder {
-    private _abiDecoder: AbiDecoder;
-    constructor(networkIdIfExists?: number) {
-        if (_.isUndefined(networkIdIfExists)) {
-            throw new Error('networkId not specified');
+const abiArrays: AbiDefinition[][] = [];
+_.forEach(artifacts, (artifact: ContractArtifact) => {
+    const compilerOutput = artifact.compilerOutput;
+    abiArrays.push(compilerOutput.abi);
+});
+const abiDecoder = new AbiDecoder(abiArrays);
+
+export const logDecoder = {
+    wrapLogBigNumbers(log: any): any {
+        const argNames = _.keys(log.args);
+        for (const argName of argNames) {
+            const isWeb3BigNumber = _.startsWith(log.args[argName].constructor.toString(), 'function BigNumber(');
+            if (isWeb3BigNumber) {
+                log.args[argName] = new BigNumber(log.args[argName]);
+            }
         }
-        const abiArrays: AbiDefinition[][] = [];
-        _.forEach(artifacts, (artifact: ContractArtifact) => {
-            const compilerOutput = artifact.compilerOutput;
-            abiArrays.push(compilerOutput.abi);
-        });
-        this._abiDecoder = new AbiDecoder(abiArrays);
-    }
-    public decodeLogOrThrow<ArgsType>(log: LogEntry): LogWithDecodedArgs<ArgsType> | RawLog {
-        const logWithDecodedArgsOrLog = this._abiDecoder.tryToDecodeLogOrNoop(log);
+    },
+    decodeLogOrThrow<ArgsType>(log: LogEntry): LogWithDecodedArgs<ArgsType> | RawLog {
+        const logWithDecodedArgsOrLog = abiDecoder.tryToDecodeLogOrNoop(log);
         if (_.isUndefined((logWithDecodedArgsOrLog as LogWithDecodedArgs<ArgsType>).args)) {
             throw new Error(`Unable to decode log: ${JSON.stringify(log)}`);
         }
-        wrapLogBigNumbers(logWithDecodedArgsOrLog);
+        logDecoder.wrapLogBigNumbers(logWithDecodedArgsOrLog);
         return logWithDecodedArgsOrLog;
-    }
-}
-
-function wrapLogBigNumbers(log: any): any {
-    const argNames = _.keys(log.args);
-    for (const argName of argNames) {
-        const isWeb3BigNumber = _.startsWith(log.args[argName].constructor.toString(), 'function BigNumber(');
-        if (isWeb3BigNumber) {
-            log.args[argName] = new BigNumber(log.args[argName]);
-        }
-    }
-}
+    },
+};