workingon fail safe

voting-booth-backend/src/server/blockchain-failsafe.js

@@ -0,0 +1,30 @@
+import {handle, hasVoted} from "./utilities";
+import {addBlock, getBlockchain} from "./services/blockchain-service";
+
+/**
+ * File contains code that a child process will execute to
+ * act as a failsafe if the blockchain server is temporarily down.
+ * The failsafe is, if the blockchain server is unreachable, the vote
+ * will be saved and will attempt sending at a later time.
+ **/
+process.on('message', async (message) => {
+    // TODO: check to ensure message is a vote
+    const interval = setInterval(async () => {
+        // TODO: send vote
+        let [chain, err] = await handle(getBlockchain());
+        if (err) {
+            res.status(503).send('Voting store not reachable');
+            return;
+        }
+        // if user has already voted, reject
+        if (hasVoted(chain, user, 'true')) {
+            res.status(200).json({
+                success: false,
+                message: 'User has already voted'
+            });
+            return;
+        }
+        let status;
+        [status, err] = await handle(addBlock(vote));
+    }, 10000);
+});