Solc v0.4.24 to v0.6.6

contracts/Migrations.sol

@@ -1,8 +1,8 @@
-pragma solidity 0.4.24;
+pragma solidity >=0.4.24 <0.7.0;
 
 contract Migrations {
   address public owner;
-  uint public last_completed_migration;
+  uint256 public last_completed_migration;
 
   modifier restricted() {
     if (msg.sender == owner) _;
@@ -12,7 +12,7 @@ contract Migrations {
     owner = msg.sender;
   }
 
-  function setCompleted(uint completed) public restricted {
+  function setCompleted(uint256 completed) public restricted {
     last_completed_migration = completed;
   }
 

contracts/MyContract.sol

@@ -1,7 +1,7 @@
-pragma solidity 0.4.24;
+pragma solidity 0.6.6;
 
-import "@chainlink/contracts/src/v0.4/ChainlinkClient.sol";
-import "openzeppelin-solidity/contracts/ownership/Ownable.sol";
+import "@chainlink/contracts/src/v0.6/ChainlinkClient.sol";
+import "@openzeppelin/contracts/access/Ownable.sol";
 
 /**
  * @title MyContract is an example contract which requests data from
@@ -105,4 +105,4 @@ contract MyContract is ChainlinkClient, Ownable {
   {
     cancelChainlinkRequest(_requestId, _payment, _callbackFunctionId, _expiration);
   }
-}
+}

migrations/2_mycontract_migration.js

@@ -1,21 +1,20 @@
 const MyContract = artifacts.require('MyContract')
 const { LinkToken } = require('@chainlink/contracts/truffle/v0.4/LinkToken')
-const { Oracle } = require('@chainlink/contracts/truffle/v0.4/Oracle')
+const { Oracle } = require('@chainlink/contracts/truffle/v0.6/Oracle')
 
-module.exports = (deployer, network, [defaultAccount]) => {
+module.exports = async (deployer, network, [defaultAccount]) => {
   // Local (development) networks need their own deployment of the LINK
   // token and the Oracle contract
   if (!network.startsWith('live')) {
     LinkToken.setProvider(deployer.provider)
     Oracle.setProvider(deployer.provider)
-
-    deployer.deploy(LinkToken, { from: defaultAccount }).then(link => {
-      return deployer
-        .deploy(Oracle, link.address, { from: defaultAccount })
-        .then(() => {
-          return deployer.deploy(MyContract, link.address)
-        })
-    })
+    try {
+      await deployer.deploy(LinkToken, { from: defaultAccount })
+      await deployer.deploy(Oracle, LinkToken.address, { from: defaultAccount })
+      await deployer.deploy(MyContract, LinkToken.address)
+    } catch (err) {
+      console.error(err)
+    }
   } else {
     // For live networks, use the 0 address to allow the ChainlinkRegistry
     // contract automatically retrieve the correct address for you

package.json

@@ -15,16 +15,16 @@
   },
   "license": "MIT",
   "dependencies": {
-    "@chainlink/contracts": "^0.0.3",
-    "@chainlink/test-helpers": "0.0.2",
-    "openzeppelin-solidity": "1.12.0"
+    "@chainlink/contracts": "^0.0.8",
+    "@openzeppelin/contracts": "^3.1.0",
+    "@truffle/hdwallet-provider": "^1.0.40"
   },
   "devDependencies": {
     "@chainlink/belt": "^0.0.1",
-    "@truffle/hdwallet-provider": "^1.0.30",
+    "@chainlink/test-helpers": "0.0.5",
+    "@openzeppelin/test-helpers": "^0.5.6",
     "chai": "^4.2.0",
     "depcheck": "^0.9.1",
-    "openzeppelin-test-helpers": "^0.4.3",
     "solhint": "^2.1.0",
     "truffle": "^5.1.5"
   }

scripts/fund-contract.js

@@ -1,5 +1,5 @@
 const MyContract = artifacts.require('MyContract')
-const { LinkToken } = require('@chainlink/contracts/truffle/v0.4/LinkToken')
+const LinkTokenInterface = artifacts.require('LinkTokenInterface')
 
 /*
   This script is meant to assist with funding the requesting
@@ -11,10 +11,14 @@ const { LinkToken } = require('@chainlink/contracts/truffle/v0.4/LinkToken')
 const payment = process.env.TRUFFLE_CL_BOX_PAYMENT || '1000000000000000000'
 
 module.exports = async callback => {
-  const mc = await MyContract.deployed()
-  const tokenAddress = await mc.getChainlinkToken()
-  const token = await LinkToken.at(tokenAddress)
-  console.log('Funding contract:', mc.address)
-  const tx = await token.transfer(mc.address, payment)
-  callback(tx.tx)
+  try {
+    const mc = await MyContract.deployed()
+    const tokenAddress = await mc.getChainlinkToken()
+    const token = await LinkTokenInterface.at(tokenAddress)
+    console.log('Funding contract:', mc.address)
+    const tx = await token.transfer(mc.address, payment)
+    callback(tx.tx)
+  } catch (err) {
+    callback(err)
+  }
 }

test/MyContract_test.js

@@ -1,10 +1,10 @@
 /* eslint-disable @typescript-eslint/no-var-requires */
 const { oracle } = require('@chainlink/test-helpers')
-const { expectRevert, time } = require('openzeppelin-test-helpers')
+const { expectRevert, time } = require('@openzeppelin/test-helpers')
 
 contract('MyContract', accounts => {
   const { LinkToken } = require('@chainlink/contracts/truffle/v0.4/LinkToken')
-  const { Oracle } = require('@chainlink/contracts/truffle/v0.4/Oracle')
+  const { Oracle } = require('@chainlink/contracts/truffle/v0.6/Oracle')
   const MyContract = artifacts.require('MyContract.sol')
 
   const defaultAccount = accounts[0]

truffle-config.js

@@ -7,19 +7,24 @@ module.exports = {
       port: 8545,
       network_id: '*',
     },
+    ganache: {
+      host: '127.0.0.1',
+      port: 7545,
+      network_id: '*',
+    },
     live: {
       provider: () => {
         return new HDWalletProvider(process.env.MNEMONIC, process.env.RPC_URL)
       },
       network_id: '*',
-      // Necessary due to https://github.com/trufflesuite/truffle/issues/1971
-      // Should be fixed in Truffle 5.0.17
+      // ~~Necessary due to https://github.com/trufflesuite/truffle/issues/1971~~
+      // Necessary due to https://github.com/trufflesuite/truffle/issues/3008
       skipDryRun: true,
     },
   },
   compilers: {
     solc: {
-      version: '0.4.24',
+      version: '0.6.6',
     },
   },
 }