Create chainlink integration

contracts/common/Snaplink.sol

@@ -0,0 +1,61 @@
+/*
+  This file is part of The Colony Network.
+
+  The Colony Network is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  The Colony Network is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with The Colony Network. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+pragma solidity 0.7.3;
+pragma experimental ABIEncoderV2;
+
+import "@chainlink/contracts/src/v0.7/ChainlinkClient.sol";
+import "./../../lib/dappsys/erc20.sol";
+
+
+contract Snaplink is ChainlinkClient {
+    using Chainlink for Chainlink.Request;
+
+    uint256 public volume;
+
+    address private oracle;
+    bytes32 private jobId;
+    uint256 private fee;
+
+    uint256 constant WAD = 10 ** 18;
+    bytes4 constant SELECTOR = bytes4(keccak256("fulfill(bytes32,uint256"));
+
+    constructor() public {
+        setPublicChainlinkToken();
+        oracle = 0x3A56aE4a2831C3d3514b5D7Af5578E45eBDb7a40;
+        jobId = "b7ca0d48c7a4b2da9268456665d11ae";
+        fee = WAD / 10;
+    }
+
+    function requestVolumeData() public returns (bytes32 requestId) {
+        Chainlink.Request memory request = buildChainlinkRequest(jobId, address(this), SELECTOR);
+
+        request.add("get", "https://min-api.cryptocompare.com/data/pricemultifull?fsyms=ETH&tsyms=USD");
+        request.add("path", "RAW.ETH.USD.VOLUME24HOUR");
+        request.addInt("times", int256(WAD));
+
+        require(ERC20(chainlinkTokenAddress()).balanceOf(address(this)) >= fee, "insufficient-balance");
+        requestId = sendChainlinkRequestTo(oracle, request, fee);
+    }
+
+    function fulfill(bytes32 _requestId, uint256 _volume)
+      public
+      recordChainlinkFulfillment(_requestId)
+    {
+        volume = _volume;
+    }
+}

package.json

@@ -130,6 +130,7 @@
     "packages/*"
   ],
   "dependencies": {
+    "@chainlink/contracts": "^0.3.0",
     "eslint-plugin-no-only-tests": "^2.4.0"
   }
 }

truffle.js

@@ -43,13 +43,19 @@ module.exports = {
     },
     goerli: {
       provider: () => {
-        return new HDWalletProvider("replace-with-private-key-when-using", "https://goerli.infura.io/v3/e21146aa267845a2b7b4da025178196d");
+        return new HDWalletProvider("private-key", "https://goerli.infura.io/v3/infura-key");
       },
       network_id: "5",
     },
+    rinkeby: {
+      provider: () => {
+        return new HDWalletProvider("private-key", "https://rinkeby.infura.io/v3/infura-key");
+      },
+      network_id: "4",
+    },
     mainnet: {
       provider: () => {
-        return new HDWalletProvider("replace-with-private-key-when-using", "https://mainnet.infura.io/v3/e21146aa267845a2b7b4da025178196d");
+        return new HDWalletProvider("private-key", "https://mainnet.infura.io/v3/infura-key");
       },
       network_id: "1",
     },

yarn.lock

@@ -861,6 +861,11 @@
     lodash "^4.17.19"
     to-fast-properties "^2.0.0"
 
+"@chainlink/contracts@^0.3.0":
+  version "0.3.0"
+  resolved "https://registry.yarnpkg.com/@chainlink/contracts/-/contracts-0.3.0.tgz#b388615acab5d9353bc15b5357250cf0662bc8fe"
+  integrity sha512-Pxu5qMTa0gc28Sxf9hyBkvwhPMn3HD62cGXy54RkL9PcabOHlUsk1i3BoFf3rwFr7T30N/obYn4de3ZrG12PDA==
+
 "@codechecks/client@^0.1.5":
   version "0.1.10"
   resolved "https://registry.yarnpkg.com/@codechecks/client/-/client-0.1.10.tgz#41fe736c424976d9feb8116b131fb9c1f099d105"