Split Contract

app/src/config/drizzleOptions.js

@@ -1,4 +1,5 @@
 import Forum from '../contracts/Forum.json';
+import Posting from '../contracts/Posting.json';
 
 const drizzleOptions = {
   web3: {
@@ -7,9 +8,10 @@ const drizzleOptions = {
       url: 'ws://127.0.0.1:9545'
     }
   },
-  contracts: [Forum],
+  contracts: [Forum, Posting],
   events: {
-    Forum: ['UserSignedUp', 'UsernameUpdated', 'TopicCreated', 'PostCreated']
+    Forum: ['UserSignedUp', 'UsernameUpdated'],
+    Posting: ['TopicCreated', 'PostCreated']
   },
   polls: {
     accounts: 2000,

app/src/containers/BoardContainer.js

@@ -11,7 +11,7 @@ import FloatingButton from '../components/FloatingButton';
 
 /* import { showProgressBar, hideProgressBar } from '../redux/actions/userInterfaceActions'; */
 
-const contract = 'Forum';
+const contract = 'Posting';
 const getNumberOfTopicsMethod = 'getNumberOfTopics';
 
 class BoardContainer extends Component {

contracts/Forum.sol

@@ -1,6 +1,14 @@
 pragma solidity >=0.5.6 <0.6.0;
 
+import "./Posting.sol";
+
 contract Forum {
+    Posting posting;
+
+    constructor(address addr) public {
+        posting = Posting(addr);
+        posting.setForumContractAddress();
+    }
 
     //----------------------------------------USER----------------------------------------
     struct User {
@@ -155,86 +163,41 @@ contract Forum {
         );
     }
 
-    //----------------------------------------POSTING----------------------------------------
-    struct Topic {
-        uint topicID;
-        address author;
-        uint timestamp;
-        uint[] postIDs;
-    }
-
-    struct Post {
-        uint postID;
-        address author;
-        uint timestamp;
-        uint topicID;
-    }
-
-    uint numTopics;   // Total number of topics
-    uint numPosts;    // Total number of posts
-
-    mapping (uint => Topic) topics;
-    mapping (uint => Post) posts;
-
-    event TopicCreated(uint topicID, uint postID);
-    event PostCreated(uint postID, uint topicID);
+    //----POSTING-----
 
     function createTopic() public returns (uint, uint) {
         require(hasUserSignedUp(msg.sender));  // Only registered users can create topics
-        //Creates topic
-        uint topicID = numTopics++;
-        topics[topicID] = Topic(topicID, msg.sender, block.timestamp, new uint[](0));
+        (uint topicID, uint postID) = posting.createTopic(msg.sender);
         users[msg.sender].topicIDs.push(topicID);
-
-        //Adds first post to topic
-        uint postID = numPosts++;
-        posts[postID] = Post(postID, msg.sender, block.timestamp, topicID);
-        topics[topicID].postIDs.push(postID);
         users[msg.sender].postIDs.push(postID);
-
-        emit TopicCreated(topicID, postID);
         return (topicID, postID);
     }
 
     function createPost(uint topicID) public returns (uint) {
         require(hasUserSignedUp(msg.sender));  // Only registered users can create posts
-        require(topicID<numTopics); // Only allow posting to a topic that exists
-        uint postID = numPosts++;
-        posts[postID] = Post(postID, msg.sender, block.timestamp, topicID);
-        topics[topicID].postIDs.push(postID);
+        uint postID = posting.createPost(topicID, msg.sender);
         users[msg.sender].postIDs.push(postID);
-        emit PostCreated(postID, topicID);
         return postID;
     }
 
-    function getNumberOfTopics() public view returns (uint) {
-        return numTopics;
-    }
-
     function getTopic(uint topicID) public view returns (string memory, address, string memory, uint, uint[] memory) {
-        //require(hasUserSignedUp(msg.sender)); needed?
-        require(topicID<numTopics);
-        return (getOrbitTopicsDB(topics[topicID].author),
-        topics[topicID].author,
-        users[topics[topicID].author].username,
-        topics[topicID].timestamp,
-        topics[topicID].postIDs
+        (address author, uint timestamp, uint[] memory postIDs) = posting.getTopicInfo(topicID);
+        return (getOrbitTopicsDB(author),
+        author,
+        users[author].username,
+        timestamp,
+        postIDs
         );
     }
 
-    function getTopicPosts(uint topicID) public view returns (uint[] memory) {
-        require(topicID<numTopics); // Topic should exist
-        return topics[topicID].postIDs;
-    }
-
     function getPost(uint postID) public view returns (string memory, address, string memory, uint, uint) {
-        //require(hasUserSignedUp(msg.sender)); needed?
-        require(postID<numPosts);
-        return (getOrbitPostsDB(posts[postID].author),
-        posts[postID].author,
-        users[posts[postID].author].username,
-        posts[postID].timestamp,
-        posts[postID].topicID
+        (address author, uint timestamp, uint topicID) = posting.getPostInfo(postID);
+        return (getOrbitPostsDB(author),
+        author,
+        users[author].username,
+        timestamp,
+        topicID
         );
     }
+
 }

contracts/Posting.sol

@@ -0,0 +1,85 @@
+pragma solidity >=0.5.6 <0.6.0;
+
+contract Posting {
+    address forumContractAddress;
+
+    function setForumContractAddress() public{
+        require(forumContractAddress==address(0));
+        forumContractAddress = msg.sender;
+    }
+
+    struct Topic {
+        uint topicID;
+        address author;
+        uint timestamp;
+        uint[] postIDs;
+    }
+
+    struct Post {
+        uint postID;
+        address author;
+        uint timestamp;
+        uint topicID;
+    }
+
+    uint numTopics;   // Total number of topics
+    uint numPosts;    // Total number of posts
+
+    mapping (uint => Topic) topics;
+    mapping (uint => Post) posts;
+
+    event TopicCreated(uint topicID, uint postID);
+    event PostCreated(uint postID, uint topicID);
+
+    function createTopic(address author) public returns (uint, uint) {
+        require(msg.sender==forumContractAddress);
+        //Creates topic
+        uint topicID = numTopics++;
+        topics[topicID] = Topic(topicID, author, block.timestamp, new uint[](0));
+
+        //Adds first post to topic
+        uint postID = numPosts++;
+        posts[postID] = Post(postID, author, block.timestamp, topicID);
+        topics[topicID].postIDs.push(postID);
+
+        emit TopicCreated(topicID, postID);
+        return (topicID, postID);
+    }
+
+    function createPost(uint topicID, address author) public returns (uint) {
+        require(msg.sender==forumContractAddress);
+        require(topicID<numTopics); // Only allow posting to a topic that exists
+        uint postID = numPosts++;
+        posts[postID] = Post(postID, author, block.timestamp, topicID);
+        topics[topicID].postIDs.push(postID);
+        emit PostCreated(postID, topicID);
+        return postID;
+    }
+
+    function getNumberOfTopics() public view returns (uint) {
+        return numTopics;
+    }
+
+    function getTopicInfo(uint topicID) public view returns (address, uint, uint[] memory) {
+        require(topicID<numTopics);
+        return (topics[topicID].author,
+        topics[topicID].timestamp,
+        topics[topicID].postIDs
+        );
+    }
+
+    function getTopicPosts(uint topicID) public view returns (uint[] memory) {
+        require(topicID<numTopics); // Topic should exist
+        return topics[topicID].postIDs;
+    }
+
+    function getPostInfo(uint postID) public view returns (address, uint, uint) {
+        require(postID<numPosts);
+        return (
+        posts[postID].author,
+        posts[postID].timestamp,
+        posts[postID].topicID
+        );
+    }
+
+}

migrations/2_deploy_contracts.js

@@ -1,5 +1,8 @@
 const Forum = artifacts.require("Forum");
+const Posting = artifacts.require("Posting");
 
 module.exports = function(deployer) {
-  deployer.deploy(Forum);
+  deployer.deploy(Posting).then(function() {
+    return deployer.deploy(Forum, Posting.address)
+  });
 };