backend ported to node.js (work in progress)

node/sql.js

@@ -0,0 +1,77 @@
+const db = require('sqlite');
+const utils = require('./utils');
+
+async function insert(table_name, rec) {
+    const columns = Object.keys(rec).join(", ");
+    const questionMarks = Object.keys(rec).map(p => "?").join(", ");
+
+    const res = await execute("INSERT INTO " + table_name + "(" + columns + ") VALUES (" + questionMarks + ")", Object.values(rec));
+
+    return res.lastID;
+}
+
+async function beginTransaction() {
+    return await db.run("BEGIN");
+}
+
+async function commit() {
+    return await db.run("COMMIT");
+}
+
+async function getOption(optName) {
+    const row = await getSingleResult("SELECT opt_value FROM options WHERE opt_name = ?", [optName]);
+
+    return row['opt_value'];
+}
+
+async function setOption(optName, optValue) {
+    await execute("UPDATE options SET opt_value = ? WHERE opt_name = ?", [optValue, optName]);
+}
+
+async function getSingleResult(query, params = []) {
+    return await db.get(query, ...params);
+}
+
+async function getResults(query, params = []) {
+    return await db.all(query, ...params);
+}
+
+async function execute(query, params = []) {
+    return await db.run(query, ...params);
+}
+
+async function remove(tableName, noteId) {
+    return await execute("DELETE FROM " + tableName + " WHERE note_id = ?", [noteId]);
+}
+
+async function addAudit(category, req=null, noteId=null, changeFrom=null, changeTo=null, comment=null) {
+    const now = utils.nowTimestamp();
+
+    const browserId = req == null ? null : req.get('x-browser-id');
+
+    await execute("INSERT INTO audit_log (date_modified, category, browser_id, note_id, change_from, change_to, comment)"
+           + " VALUES (?, ?, ?, ?, ?, ?, ?)", [now, category, browserId, noteId, changeFrom, changeTo, comment]);
+}
+
+async function deleteRecentAudits(category, req, noteId) {
+    const browserId = req.get('x-browser-id');
+
+    const deleteCutoff = utils.nowTimestamp() - 10 * 60;
+
+    await execute("DELETE FROM audit_log WHERE category = ? AND browser_id = ? AND note_id = ? AND date_modified > ?",
+            [category, browserId, noteId, deleteCutoff])
+}
+
+module.exports = {
+    insert,
+    getSingleResult,
+    getResults,
+    execute,
+    getOption,
+    setOption,
+    beginTransaction,
+    commit,
+    addAudit,
+    deleteRecentAudits,
+    remove
+};