Allow to add nodes

.eslintrc.js

@@ -0,0 +1,24 @@
+module.exports = {
+  env: {
+    browser: true,
+    es6: true,
+  },
+  extends: 'airbnb-base',
+  globals: {
+    Atomics: 'readonly',
+    SharedArrayBuffer: 'readonly',
+    artifacts: 'readonly',
+    contract: 'readonly',
+    describe: 'readonly',
+    beforeEach: 'readonly',
+    before: 'readonly',
+    afterEach: 'readonly',
+    after: 'readonly',
+    it: 'readonly',
+    assert: 'readonly',
+  },
+  parserOptions: {
+    ecmaVersion: 2018,
+    sourceType: 'module',
+  },
+};

contracts/Nodes.sol

@@ -0,0 +1,39 @@
+pragma solidity >=0.4.21 <0.6.0;
+
+contract Nodes
+{
+  address owner;
+  string[] public nodes;
+  uint public nodeCount;
+
+  modifier onlyOwner() {
+    require(msg.sender == owner);
+    _;
+  }
+
+  constructor()
+  public
+  {
+    owner = msg.sender;
+  }
+
+  function addNode(string memory _node)
+  public
+  onlyOwner
+  {
+    nodes.push(_node);
+    nodeCount++;
+  }
+
+  function deleteAll()
+  public
+  onlyOwner
+  {
+    delete nodes;
+    nodeCount = 0;
+  }
+
+  function () external payable {
+    require(msg.data.length == 0);
+  }
+}

migrations/1_initial_migration.js

@@ -1,5 +1,5 @@
-const Migrations = artifacts.require("Migrations");
+const Migrations = artifacts.require('Migrations');
 
-module.exports = function(deployer) {
+module.exports = function deploy(deployer) {
   deployer.deploy(Migrations);
 };

migrations/2_deploy_contracts.js

@@ -0,0 +1,5 @@
+const Nodes = artifacts.require('./Nodes.sol');
+
+module.exports = function deploy(deployer) {
+  deployer.deploy(Nodes);
+};

package.json

@@ -0,0 +1,26 @@
+{
+  "name": "network-incentivisation-contract",
+  "version": "1.0.0",
+  "description": "",
+  "main": "truffle-config.js",
+  "directories": {
+    "test": "test"
+  },
+  "dependencies": {
+    "truffle-hdwallet-provider": "^1.0.5"
+  },
+  "devDependencies": {
+    "eslint": "^5.15.3",
+    "eslint-config-airbnb-base": "^13.1.0",
+    "eslint-plugin-import": "^2.16.0",
+    "nodemon": "^1.18.10"
+  },
+  "scripts": {
+    "test": "truffle test",
+    "lint": "eslint . --ext .js",
+    "lint-watch": "nodemon --exec 'npm run lint'",
+    "validate": "npm test && npm run lint"
+  },
+  "author": "",
+  "license": "ISC"
+}

test/TestNodes.js

@@ -0,0 +1,80 @@
+const Nodes = artifacts.require('Nodes');
+
+const node1 = 'enode://da61e9eff86a56633b635f887d8b91e0ff5236bbc05b8169834292e92afb92929dcf6efdbf373a37903da8fe0384d5a0a8247e83f1ce211aa429200b6d28c548@47.91.156.93:443';
+
+const node2 = 'enode://7de99e4cb1b3523bd26ca212369540646607c721ad4f3e5c821ed9148150ce6ce2e72631723002210fac1fd52dfa8bbdf3555e05379af79515e1179da37cc3db@35.188.19.210:443';
+
+contract('Nodes', async (accounts) => {
+  let instance;
+  beforeEach(async () => {
+    instance = await Nodes.deployed();
+    await instance.deleteAll();
+  });
+
+  describe('addNode', async () => {
+    describe('called by the owner', async () => {
+      beforeEach(async () => {
+        await instance.addNode(node1);
+        await instance.addNode(node2);
+      });
+
+      it('adds the first node', async () => {
+        const actualNode1 = await instance.nodes(0);
+        assert.equal(actualNode1, node1);
+      });
+
+      it('adds the second node', async () => {
+        const actualNode2 = await instance.nodes(1);
+        assert.equal(actualNode2, node2);
+      });
+
+      it('sets the count', async () => {
+        const actualNodeCount = await instance.nodeCount();
+        assert.equal(2, actualNodeCount);
+      });
+    });
+    describe('called by someone else', async () => {
+      it('throws an exception', async () => {
+        try {
+          await instance.addNode(node1, { from: accounts[1] });
+        } catch (error) {
+          return;
+        }
+        assert.fail('it should throw an exception');
+      });
+    });
+  });
+
+  describe('deleteAll', async () => {
+    beforeEach(async () => {
+      await instance.addNode(node1);
+      await instance.addNode(node2);
+      await instance.deleteAll();
+    });
+
+    it('empties the array', async () => {
+      try {
+        await instance.nodes(0);
+      } catch (error) {
+        return;
+      }
+      assert.fail('it should throw an exception');
+    });
+
+    it('sets the count', async () => {
+      const actualNodeCount = await instance.nodeCount();
+      assert.equal(0, actualNodeCount);
+    });
+
+    describe('called by someone else', async () => {
+      it('throws an exception', async () => {
+        try {
+          await instance.deleteAll({ from: accounts[1] });
+        } catch (error) {
+          return;
+        }
+        assert.fail('it should throw an exception');
+      });
+    });
+  });
+});

truffle-config.js

@@ -1,3 +1,4 @@
+const HDWalletProvider = require('truffle-hdwallet-provider');
 /**
  * Use this file to configure your truffle project. It's seeded with some
  * common settings for different networks and features like migrations,
@@ -76,10 +77,8 @@ module.exports = {
     // production: true    // Treats this network as if it was a public net. (default: false)
     // }
     goerli: {
-      provider: () => {
-        return new HDWalletProvider(process.env.MNEMONIC, 'https://goerli.infura.io/v3/' + process.env.INFURA_API_KEY)
-      },
-        network_id: '5', // eslint-disable-line camelcase
+      provider: () => new HDWalletProvider(process.env.MNEMONIC, `https://goerli.infura.io/v3/${process.env.INFURA_API_KEY}`),
+      network_id: '5',
       gas: 4465030,
       gasPrice: 10000000000,
     },
@@ -102,6 +101,6 @@ module.exports = {
       //  },
       //  evmVersion: "byzantium"
       // }
-    }
-  }
-}
+    },
+  },
+};