wip: causes issues #1 and #2

helpers/contract.js

@@ -1,28 +1,35 @@
 const fs = require('fs');
 const Web3 = require('web3');
 const HDWalletProvider = require('@truffle/hdwallet-provider');
+const TruffleContract = require("@truffle/contract");
 const BN = require('bn.js');
 const debug = require('debug')('app');
 
 const DApp = {
+  contractAddressMXC: null,
   contractInstanceMXC: null,
   contractJSONMXC: null,
   coinbase: null,
   init: async () => {
     DApp.infuraHttpProvider = 'https://ropsten.infura.io/v3/' + process.env.INFURA_API_PROJECT_ID;
     DApp.provider = new HDWalletProvider(process.env.MNENOMIC, DApp.infuraHttpProvider);
     DApp.web3 = new Web3(DApp.provider);
+    DApp.contractAddressMXC = process.env.CONTRACT_ADDRESS_MXC_TESTNET;
     DApp.contractJSONMXC = JSON.parse(fs.readFileSync('./assets/data/MXCToken.json').toString());
-    DApp.contractInstanceMXC = new DApp.web3.eth.Contract(DApp.contractJSONMXC, process.env.CONTRACT_ADDRESS_MXC_TESTNET,
-      { gasPrice: '45000', from: process.env.ETHEREUM_ADDRESS });
+    DApp.contractInstanceMXC = TruffleContract(DApp.contractJSONMXC);
     DApp.contractInstanceMXC.setProvider(DApp.provider);
+    // Use .deployed() instead when using development chain
+    DApp.contractInstanceMXC.at(DApp.contractAddressMXC);
     DApp.coinbase = await DApp.web3.eth.getCoinbase();
     DApp.getBlock();
   },
   infuraHttpProvider: null,
   getBlock: async () => {
-    const block = await DApp.web3.eth.getBlock("latest");
-    debug('Current block: ', block.timestamp);
+    // FIXME - encounter same error as here https://github.com/MetaMask/web3-provider-engine/issues/313
+    // so web3.eth needs a fix similar to the one MetaMask made (i.e. `getBlockByNumberWithRetry`)
+    // consider switching to using https://github.com/MetaMask/web3-provider-engine
+    // const block = await DApp.web3.eth.getBlock("latest");
+    // debug('Current block: ', block.timestamp);
   },
   provider: null,
   sendTransactionEth: async (to) => {
@@ -47,6 +54,24 @@ const DApp = {
       transactionHashUrl: `https://ropsten.etherscan.io/tx/${transactionHash}`
     };
   },
+  sendTransactionMxc: async (to) => {
+    debug('Recipient: ', to);
+    debug('Sending Funds. Please wait...');
+    // Show Ethereum address associated with mnemonic
+    const amount = new BN(1, 10);
+    // https://web3js.readthedocs.io/en/v1.2.6/web3-utils.html#towei
+    // const approved = await DApp.contractInstanceMXC.methods.approve(DApp.coinbase,  amount);
+    DApp.contractInstanceMXC.at(DApp.contractAddressMXC);
+    const transactionHash = await DApp.contractInstanceMXC.methods.transfer(
+      to.toLowerCase(),
+      amount
+    )
+    debug('transactionHash', transactionHash);
+
+    return {
+      transactionHashUrl: `https://ropsten.etherscan.io/tx/${transactionHash}`
+    };
+  },
   web3: null,
 };
 

server.js

@@ -7,7 +7,7 @@ const path = require('path');
 const app = express();
 const port = process.env.PORT || 5000;
 const { DApp: {
-  web3, provider, contractInstanceMXC, sendTransactionEth
+  web3, provider, contractInstanceMXC, sendTransactionEth, sendTransactionMxc
 } } = require('./helpers/contract.js');
 // debug('provider', provider);
 // debug('contract', contractInstanceMXC);
@@ -35,6 +35,26 @@ app.get('/api/faucet/eth/ropsten', async (req, res, next) => {
   }
 });
 
+/**
+ * Example: http://localhost:5000/api/faucet/mxc/ropsten?address=0x1f7ace08af5c49a5d69fbb98fb9339a729b27161
+ */
+app.get('/api/faucet/mxc/ropsten', async (req, res, next) => {
+  // Handle error in async function
+  try {
+    const to = req.query.address;
+    const { transactionHashUrl } = await sendTransactionMxc(to);
+    res.send({
+      result: 'Ropsten MXC ERC-20 sent',
+      tx: transactionHashUrl
+    });
+  } catch (error) {
+    debug(error);
+    // Handle error by Express or pass to custom error handler
+    // return next(error); // Crashes
+    return;
+  }
+});
+
 app.post('/api/world', (req, res) => {
   console.log(req.body);
   res.send(

yarn.lock

@@ -180,6 +180,11 @@
   dependencies:
     defer-to-connect "^1.0.1"
 
+"@truffle/blockchain-utils@^0.0.11":
+  version "0.0.11"
+  resolved "https://registry.yarnpkg.com/@truffle/blockchain-utils/-/blockchain-utils-0.0.11.tgz#9886f4cb7a9f20deded4451ac78f8567ae5c0d75"
+  integrity sha512-9MyQ/20M96clhIcC7fVFIckGSB8qMsmcdU6iYt98HXJ9GOLNKsCaJFz1OVsJncVreYwTUhoEXTrVBc8zrmPDJQ==
+
 "@truffle/blockchain-utils@^0.0.20":
   version "0.0.20"
   resolved "https://registry.yarnpkg.com/@truffle/blockchain-utils/-/blockchain-utils-0.0.20.tgz#17af5712504861cb374d3bbfa201ff0a2d2fead2"
@@ -204,7 +209,7 @@
     utf8 "^3.0.0"
     web3-utils "1.2.1"
 
-"@truffle/contract-schema@^3.2.0":
+"@truffle/contract-schema@^3.0.14", "@truffle/contract-schema@^3.2.0":
   version "3.2.0"
   resolved "https://registry.yarnpkg.com/@truffle/contract-schema/-/contract-schema-3.2.0.tgz#4ddd43cf3eda11ec82bb2661725a19c2f4326e96"
   integrity sha512-yeb4UoK9cbrT5/Nuz0I0p2XKbf0K1wEmyyBQmo3Q4JOrLidxf59LtDupo9Uq74RtlTAxZC0cy9DnsfWeWVma4A==
@@ -246,6 +251,11 @@
     highlightjs-solidity "^1.0.16"
     node-dir "0.1.17"
 
+"@truffle/error@^0.0.6":
+  version "0.0.6"
+  resolved "https://registry.yarnpkg.com/@truffle/error/-/error-0.0.6.tgz#75d499845b4b3a40537889e7d04c663afcaee85d"
+  integrity sha512-QUM9ZWiwlXGixFGpV18g5I6vua6/r+ZV9W/5DQA5go9A3eZUNPHPaTKMIQPJLYn6+ZV5jg5H28zCHq56LHF3yA==
+
 "@truffle/error@^0.0.8":
   version "0.0.8"
   resolved "https://registry.yarnpkg.com/@truffle/error/-/error-0.0.8.tgz#dc94ca36393403449d4b7461bf9452c241e53ec1"
@@ -4757,6 +4767,32 @@ trim-right@^1.0.1:
   resolved "https://registry.yarnpkg.com/trim-right/-/trim-right-1.0.1.tgz#cb2e1203067e0c8de1f614094b9fe45704ea6003"
   integrity sha1-yy4SAwZ+DI3h9hQJS5/kVwTqYAM=
 
+truffle-contract@^4.0.31:
+  version "4.0.31"
+  resolved "https://registry.yarnpkg.com/truffle-contract/-/truffle-contract-4.0.31.tgz#e43b7f648e2db352c857d1202d710029b107b68d"
+  integrity sha512-u3q+p1wiX5C2GpnluGx/d2iaJk7bcWshk2/TohiJyA2iQiTfkS7M4n9D9tY3JqpXR8PmD/TrA69RylO0RhITFA==
+  dependencies:
+    "@truffle/blockchain-utils" "^0.0.11"
+    "@truffle/contract-schema" "^3.0.14"
+    "@truffle/error" "^0.0.6"
+    bignumber.js "^7.2.1"
+    ethers "^4.0.0-beta.1"
+    truffle-interface-adapter "^0.2.5"
+    web3 "1.2.1"
+    web3-core-promievent "1.2.1"
+    web3-eth-abi "1.2.1"
+    web3-utils "1.2.1"
+
+truffle-interface-adapter@^0.2.5:
+  version "0.2.5"
+  resolved "https://registry.yarnpkg.com/truffle-interface-adapter/-/truffle-interface-adapter-0.2.5.tgz#aa0bee635517b4a8e06adcdc99eacb993e68c243"
+  integrity sha512-EL39OpP8FcZ99ne1Rno3jImfb92Nectd4iVsZzoEUCBfbwHe7sr0k+i45guoruSoP8nMUE81Mov2s8I5pi6d9Q==
+  dependencies:
+    bn.js "^4.11.8"
+    ethers "^4.0.32"
+    lodash "^4.17.13"
+    web3 "1.2.1"
+
 tslib@^1.9.0:
   version "1.13.0"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.13.0.tgz#c881e13cc7015894ed914862d276436fa9a47043"