Revert "Revert "Added all db write methods to a queue.""

This reverts commit 9cf4a7ed55.

writeQueue.js

@@ -0,0 +1,69 @@
+'use strict';
+
+//used to queue objects to be written to the db
+class WriteQueue {
+    /**
+     * @param {Statement} statement 
+     * @param {Array} inputs 
+     * @param {callback} callback
+     */
+    constructor(statement, inputs, callback) {
+        this.statement = statement;
+        this.inputs = inputs;
+        this.callback = callback;
+    }
+
+    run() {
+        return new Promise((resolve, reject) => {
+            this.statement.run(this.inputs, (err) => this.end(err, resolve, reject));
+        });
+    }
+
+    end(err, resolve, reject) {
+        resolve();
+
+        if (this.callback) {
+            this.callback(err);
+        }
+    }
+}
+
+module.exports = {
+    WriteQueue,
+    addToWriteQueue
+}
+
+/**
+ * Array of class write queue
+ * 
+ * @typedef WriteQueue[]
+ */
+var dbQueue = [];
+
+//is a queue check currently running
+var queueRunning = false;
+
+/**
+ * Adds an item to the write queue and starts the run function if needed.
+ * 
+ * @param {WriteQueue} item 
+ */
+function addToWriteQueue(item) {
+    dbQueue.push(item);
+
+    if (!queueRunning) {
+        runThroughWriteQueue();
+    }
+}
+
+async function runThroughWriteQueue() {
+    queueRunning = true;
+
+    while (dbQueue.length > 0) {
+        await dbQueue[0].run();
+
+        dbQueue.splice(0, 1);
+    }
+
+    queueRunning = false;
+}