Support Tuples from function returns

7 files changed, 93 insertions, 15 deletions

diff --git a/packages/base-contract/package.json b/packages/base-contract/package.json
index 22ae43cdc..78dcbfe7f 100644
--- a/packages/base-contract/package.json
+++ b/packages/base-contract/package.json
@@ -42,7 +42,7 @@
         "@0xproject/typescript-typings": "^0.2.0",
         "@0xproject/utils": "^0.5.2",
         "@0xproject/web3-wrapper": "^0.6.1",
-        "ethers-contracts": "^2.2.1",
+        "ethers": "^3.0.15",
         "lodash": "^4.17.4"
     },
     "publishConfig": {
diff --git a/packages/base-contract/src/index.ts b/packages/base-contract/src/index.ts
index bfa99fac1..e95b18db6 100644
--- a/packages/base-contract/src/index.ts
+++ b/packages/base-contract/src/index.ts
@@ -10,13 +10,13 @@ import {
 } from '@0xproject/types';
 import { abiUtils, BigNumber } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import * as ethersContracts from 'ethers-contracts';
+import * as ethers from 'ethers';
 import * as _ from 'lodash';
 
 import { formatABIDataItem } from './utils';
 
 export interface EthersInterfaceByFunctionSignature {
-    [key: string]: ethersContracts.Interface;
+    [key: string]: ethers.Interface;
 }
 
 export class BaseContract {
@@ -62,7 +62,7 @@ export class BaseContract {
         }
         return txDataWithDefaults;
     }
-    protected _lookupEthersInterface(functionSignature: string): ethersContracts.Interface {
+    protected _lookupEthersInterface(functionSignature: string): ethers.Interface {
         const ethersInterface = this._ethersInterfacesByFunctionSignature[functionSignature];
         if (_.isUndefined(ethersInterface)) {
             throw new Error(`Failed to lookup method with function signature '${functionSignature}'`);
@@ -92,7 +92,7 @@ export class BaseContract {
         this._ethersInterfacesByFunctionSignature = {};
         _.each(methodAbis, methodAbi => {
             const functionSignature = abiUtils.getFunctionSignature(methodAbi);
-            this._ethersInterfacesByFunctionSignature[functionSignature] = new ethersContracts.Interface([methodAbi]);
+            this._ethersInterfacesByFunctionSignature[functionSignature] = new ethers.Interface([methodAbi]);
         });
     }
 }
diff --git a/packages/contract_templates/contract.handlebars b/packages/contract_templates/contract.handlebars
index 472452d74..cd50e14cd 100644
--- a/packages/contract_templates/contract.handlebars
+++ b/packages/contract_templates/contract.handlebars
@@ -8,7 +8,7 @@ import { BaseContract } from '@0xproject/base-contract';
 import { BlockParam, BlockParamLiteral, CallData, ContractAbi, DataItem, MethodAbi, Provider, TxData, TxDataPayable } from '@0xproject/types';
 import { BigNumber, classUtils, promisify } from '@0xproject/utils';
 import { Web3Wrapper } from '@0xproject/web3-wrapper';
-import * as ethersContracts from 'ethers-contracts';
+import * as ethers from 'ethers'
 import * as _ from 'lodash';
 
 {{#if events}}
diff --git a/packages/contract_templates/partials/callAsync.handlebars b/packages/contract_templates/partials/callAsync.handlebars
index a6f4abdf2..3cc16ccc6 100644
--- a/packages/contract_templates/partials/callAsync.handlebars
+++ b/packages/contract_templates/partials/callAsync.handlebars
@@ -5,22 +5,25 @@ async callAsync(
     defaultBlock?: BlockParam,
 ): Promise<{{> return_type outputs=outputs}}> {
     const self = this as any as {{contractName}}Contract;
-    const inputAbi = self._lookupAbi('{{this.functionSignature}}').inputs;
+    const functionSignature = '{{this.functionSignature}}';
+    const inputAbi = self._lookupAbi(functionSignature).inputs;
     [{{> params inputs=inputs}}] = BaseContract._formatABIDataItemList(inputAbi, [{{> params inputs=inputs}}], BaseContract._bigNumberToString.bind(self));
-    const encodedData = self._lookupEthersInterface('{{this.functionSignature}}').functions.{{this.name}}(
+    const ethersFunction = self._lookupEthersInterface(functionSignature).functions.{{this.name}}(
         {{> params inputs=inputs}}
-    ).data;
+    ) as ethers.CallDescription;
+    const encodedData = ethersFunction.data;
     const callDataWithDefaults = await self._applyDefaultsToTxDataAsync(
         {
             data: encodedData,
         }
     )
     const rawCallResult = await self._web3Wrapper.callAsync(callDataWithDefaults, defaultBlock);
+    let result = ethersFunction.parse(rawCallResult);
+
     const outputAbi = (_.find(self.abi, {name: '{{this.name}}'}) as MethodAbi).outputs;
-    const outputParamsTypes = _.map(outputAbi, 'type');
-    let resultArray = ethersContracts.Interface.decodeParams(outputParamsTypes, rawCallResult) as any;
-    resultArray = BaseContract._formatABIDataItemList(outputAbi, resultArray, BaseContract._lowercaseAddress.bind(this));
-    resultArray = BaseContract._formatABIDataItemList(outputAbi, resultArray, BaseContract._bnToBigNumber.bind(this));
-    return resultArray{{#singleReturnValue}}[0]{{/singleReturnValue}};
+    result = BaseContract._formatABIDataItemList(outputAbi, result, BaseContract._lowercaseAddress.bind(this));
+    result = BaseContract._formatABIDataItemList(outputAbi, result, BaseContract._bnToBigNumber.bind(this));
+
+    return result{{#singleReturnValue}}[0]{{/singleReturnValue}};
 },
 {{/hasReturnValue}}
diff --git a/packages/contract_templates/partials/return_type.handlebars b/packages/contract_templates/partials/return_type.handlebars
index 9dd509953..77d96e8c4 100644
--- a/packages/contract_templates/partials/return_type.handlebars
+++ b/packages/contract_templates/partials/return_type.handlebars
@@ -1,6 +1,6 @@
 {{#if outputs.length}}
 {{#singleReturnValue}}
-{{#returnType outputs.0.type components}}{{/returnType}}
+{{#returnType outputs.0.type outputs.0.components}}{{/returnType}}
 {{/singleReturnValue}}
 {{^singleReturnValue}}
 [{{#each outputs}}{{#returnType type components}}{{/returnType}}{{#unless @last}}, {{/unless}}{{/each}}]
diff --git a/packages/typescript-typings/types/ethers/index.d.ts b/packages/typescript-typings/types/ethers/index.d.ts
new file mode 100644
index 000000000..313e8eb8a
--- /dev/null
+++ b/packages/typescript-typings/types/ethers/index.d.ts
@@ -0,0 +1,39 @@
+declare module 'ethers' {
+    export interface TransactionDescription {
+        name: string;
+        signature: string;
+        sighash: string;
+        data: string;
+    }
+    export interface CallDescription extends TransactionDescription {
+        parse: (...args: any[]) => any;
+    }
+    export interface FunctionDescription {
+        (...params: any[]): TransactionDescription | CallDescription;
+        inputs: { names: string[]; types: string[] };
+        outputs: { names: string[]; types: string[] };
+        type: string;
+    }
+    export interface EventDescription {
+        parse: (...args: any[]) => any;
+        inputs: { names: string[]; types: string[] };
+        signature: string;
+        topic: string;
+    }
+    export class Interface {
+        public functions: { [functionName: string]: FunctionDescription };
+        public events: { [eventName: string]: EventDescription };
+        // public static decodeParams(types: string[], data: string): any[];
+        constructor(abi: any);
+    }
+    export class Contract {
+        constructor(address: string, abi: any, provider: any);
+    }
+}
+
+declare module 'ethers/utils/abi-coder' {
+    export class Coder {
+        public decode(names: any[], types: any[], data?: any[]): any[];
+        defaultCoder: Coder;
+    }
+}
diff --git a/yarn.lock b/yarn.lock
index 2d3af8b03..f45cc7b97 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -491,6 +491,10 @@ add-stream@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/add-stream/-/add-stream-1.0.0.tgz#6a7990437ca736d5e1288db92bd3266d5f5cb2aa"
 
+aes-js@3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/aes-js/-/aes-js-3.0.0.tgz#e21df10ad6c2053295bcbb8dab40b09dbea87e4d"
+
 aes-js@^0.2.3:
   version "0.2.4"
   resolved "https://registry.yarnpkg.com/aes-js/-/aes-js-0.2.4.tgz#94b881ab717286d015fa219e08fb66709dda5a3d"
@@ -3283,6 +3287,15 @@ electron-to-chromium@^1.2.7, electron-to-chromium@^1.3.30:
   version "1.3.40"
   resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.40.tgz#1fbd6d97befd72b8a6f921dc38d22413d2f6fddf"
 
+elliptic@6.3.3:
+  version "6.3.3"
+  resolved "https://registry.yarnpkg.com/elliptic/-/elliptic-6.3.3.tgz#5482d9646d54bcb89fd7d994fc9e2e9568876e3f"
+  dependencies:
+    bn.js "^4.4.0"
+    brorand "^1.0.1"
+    hash.js "^1.0.0"
+    inherits "^2.0.1"
+
 elliptic@^6.0.0, elliptic@^6.2.3, elliptic@^6.4.0:
   version "6.4.0"
   resolved "https://registry.yarnpkg.com/elliptic/-/elliptic-6.4.0.tgz#cac9af8762c85836187003c8dfe193e5e2eae5df"
@@ -3688,6 +3701,21 @@ ethers-utils@^2.1.0:
     js-sha3 "0.5.7"
     xmlhttprequest "1.8.0"
 
+ethers@^3.0.15:
+  version "3.0.15"
+  resolved "https://registry.yarnpkg.com/ethers/-/ethers-3.0.15.tgz#7cdea4e23025681f69f575bf481b227315e0e7ab"
+  dependencies:
+    aes-js "3.0.0"
+    bn.js "^4.4.0"
+    elliptic "6.3.3"
+    hash.js "^1.0.0"
+    inherits "2.0.1"
+    js-sha3 "0.5.7"
+    scrypt-js "2.0.3"
+    setimmediate "1.0.4"
+    uuid "2.0.1"
+    xmlhttprequest "1.8.0"
+
 ethjs-abi@0.1.8:
   version "0.1.8"
   resolved "https://registry.yarnpkg.com/ethjs-abi/-/ethjs-abi-0.1.8.tgz#cd288583ed628cdfadaf8adefa3ba1dbcbca6c18"
@@ -9228,6 +9256,10 @@ schema-utils@^0.4.5:
     ajv "^6.1.0"
     ajv-keywords "^3.1.0"
 
+scrypt-js@2.0.3:
+  version "2.0.3"
+  resolved "https://registry.yarnpkg.com/scrypt-js/-/scrypt-js-2.0.3.tgz#bb0040be03043da9a012a2cea9fc9f852cfc87d4"
+
 scrypt.js@0.2.0, scrypt.js@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/scrypt.js/-/scrypt.js-0.2.0.tgz#af8d1465b71e9990110bedfc593b9479e03a8ada"
@@ -9412,6 +9444,10 @@ set-value@^2.0.0:
     is-plain-object "^2.0.3"
     split-string "^3.0.1"
 
+setimmediate@1.0.4:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/setimmediate/-/setimmediate-1.0.4.tgz#20e81de622d4a02588ce0c8da8973cbcf1d3138f"
+
 setimmediate@^1.0.4, setimmediate@^1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/setimmediate/-/setimmediate-1.0.5.tgz#290cbb232e306942d7d7ea9b83732ab7856f8285"