4 files changed, 77 insertions, 16 deletions
diff --git a/packages/contracts/src/utils/exchange_wrapper.ts b/packages/contracts/src/utils/exchange_wrapper.ts
index 75b452b04..daab002b3 100644
--- a/packages/contracts/src/utils/exchange_wrapper.ts
+++ b/packages/contracts/src/utils/exchange_wrapper.ts
@@ -20,10 +20,7 @@ export class ExchangeWrapper {
         from: string,
         opts: { takerTokenFillAmount?: BigNumber } = {},
     ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = signedOrderUtils.createFill(
-            signedOrder,
-            opts.takerTokenFillAmount,
-        );
+        const params = signedOrderUtils.createFill(signedOrder, opts.takerTokenFillAmount);
         const txHash = await this._exchange.fillOrder.sendTransactionAsync(
             params.orderAddresses,
             params.orderValues,
@@ -60,10 +57,7 @@ export class ExchangeWrapper {
         from: string,
         opts: { takerTokenFillAmount?: BigNumber } = {},
     ): Promise<TransactionReceiptWithDecodedLogs> {
-        const params = signedOrderUtils.createFill(
-            signedOrder,
-            opts.takerTokenFillAmount,
-        );
+        const params = signedOrderUtils.createFill(signedOrder, opts.takerTokenFillAmount);
         const txHash = await this._exchange.fillOrKillOrder.sendTransactionAsync(
             params.orderAddresses,
             params.orderValues,
diff --git a/packages/contracts/src/utils/formatters.ts b/packages/contracts/src/utils/formatters.ts
index 88e12a6b4..48c77fea1 100644
--- a/packages/contracts/src/utils/formatters.ts
+++ b/packages/contracts/src/utils/formatters.ts
@@ -5,10 +5,7 @@ import * as _ from 'lodash';
 import { BatchCancelOrders, BatchFillOrders, MarketFillOrders } from './types';
 
 export const formatters = {
-    createBatchFill(
-        signedOrders: SignedOrder[],
-        takerTokenFillAmounts: BigNumber[] = [],
-    ) {
+    createBatchFill(signedOrders: SignedOrder[], takerTokenFillAmounts: BigNumber[] = []) {
         const batchFill: BatchFillOrders = {
             orderAddresses: [],
             orderValues: [],
@@ -42,10 +39,7 @@ export const formatters = {
         });
         return batchFill;
     },
-    createMarketFillOrders(
-        signedOrders: SignedOrder[],
-        takerTokenFillAmount: BigNumber,
-    ) {
+    createMarketFillOrders(signedOrders: SignedOrder[], takerTokenFillAmount: BigNumber) {
         const marketFillOrders: MarketFillOrders = {
             orderAddresses: [],
             orderValues: [],
diff --git a/packages/contracts/src/utils/log_decoder.ts b/packages/contracts/src/utils/log_decoder.ts
new file mode 100644
index 000000000..98dd8eab6
--- /dev/null
+++ b/packages/contracts/src/utils/log_decoder.ts
@@ -0,0 +1,29 @@
+import { LogWithDecodedArgs, RawLog } from '@0xproject/types';
+import { AbiDecoder } from '@0xproject/utils';
+import * as _ from 'lodash';
+import * as Web3 from 'web3';
+
+import { artifacts } from './artifacts';
+import { Artifact } from './types';
+
+export class LogDecoder {
+    private _abiDecoder: AbiDecoder;
+    constructor(networkId: number) {
+        if (_.isUndefined(networkId)) {
+            throw new Error('networkId not specified');
+        }
+        const abiArrays: Web3.AbiDefinition[][] = [];
+        _.forEach(artifacts, (artifact: Artifact) => {
+            const network = artifact.networks[networkId];
+            if (_.isUndefined(network)) {
+                throw new Error(`Artifact does not exist on network ${networkId}`);
+            }
+            abiArrays.push(network.abi);
+        });
+        this._abiDecoder = new AbiDecoder(abiArrays);
+    }
+    public tryToDecodeLogOrNoop<ArgsType>(log: Web3.LogEntry): LogWithDecodedArgs<ArgsType> | RawLog {
+        const logWithDecodedArgs = this._abiDecoder.tryToDecodeLogOrNoop(log);
+        return logWithDecodedArgs;
+    }
+}
diff --git a/packages/contracts/src/utils/signed_order_utils.ts b/packages/contracts/src/utils/signed_order_utils.ts
new file mode 100644
index 000000000..6122748b4
--- /dev/null
+++ b/packages/contracts/src/utils/signed_order_utils.ts
@@ -0,0 +1,44 @@
+import { SignedOrder } from '0x.js';
+import { BigNumber } from '@0xproject/utils';
+import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import ethUtil = require('ethereumjs-util');
+import * as _ from 'lodash';
+
+import { crypto } from './crypto';
+
+export const signedOrderUtils = {
+    createFill: (signedOrder: SignedOrder, takerTokenFillAmount?: BigNumber) => {
+        const fill = {
+            ...signedOrderUtils.getOrderAddressesAndValues(signedOrder),
+            takerTokenFillAmount: takerTokenFillAmount || signedOrder.takerTokenAmount,
+            ...signedOrder.ecSignature,
+        };
+        return fill;
+    },
+    createCancel(signedOrder: SignedOrder, takerTokenCancelAmount?: BigNumber) {
+        const cancel = {
+            ...signedOrderUtils.getOrderAddressesAndValues(signedOrder),
+            takerTokenCancelAmount: takerTokenCancelAmount || signedOrder.takerTokenAmount,
+        };
+        return cancel;
+    },
+    getOrderAddressesAndValues(signedOrder: SignedOrder) {
+        return {
+            orderAddresses: [
+                signedOrder.maker,
+                signedOrder.taker,
+                signedOrder.makerTokenAddress,
+                signedOrder.takerTokenAddress,
+                signedOrder.feeRecipient,
+            ],
+            orderValues: [
+                signedOrder.makerTokenAmount,
+                signedOrder.takerTokenAmount,
+                signedOrder.makerFee,
+                signedOrder.takerFee,
+                signedOrder.expirationUnixTimestampSec,
+                signedOrder.salt,
+            ],
+        };
+    },
+};