Add sqlite adapter (#48)

lib/notification/adapter/sqlite.js

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+const { markdown2Html } = require('../../services/markdown');
+const Database = require('better-sqlite3');
+
+/**
+ * simply prints out the found data to the console
+ * @param serviceName e.g immowelt
+ * @param newListings an array with newly found listings
+ * @param jobKey name of the current job that is being executed
+ */
+exports.send = ({ serviceName, newListings, jobKey }) => {
+  const db = new Database('db/listings.db');
+  const fields = ['serviceName', 'jobKey', 'id', 'size', 'rooms', 'price', 'address', 'title', 'link', 'description'];
+  db.prepare(`CREATE TABLE IF NOT EXISTS listing (${fields.join(' TEXT, ')} TEXT);`).run();
+  const insert = db.prepare(`INSERT INTO listing (${fields.join(', ')}) VALUES (@${fields.join(', @')})`);
+  newListings.map((listing) => {
+    let insertListing = {};
+    fields.map((field) => {
+      insertListing[field] = listing[field];
+    });
+    insertListing.serviceName = serviceName;
+    insertListing.jobKey = jobKey;
+    insert.run(insertListing);
+  });
+  return Promise.resolve();
+};
+
+exports.config = {
+  id: __filename.slice(__dirname.length + 1, -3),
+  name: 'Sqlite',
+  description: 'This adapter stores listings in a local sqlite3 database.',
+  config: {},
+  readme: markdown2Html('lib/notification/adapter/sqlite.md'),
+};

lib/notification/adapter/sqlite.md

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+### Sqlite Adapter
+
+This adapter stores search results in an sqlite database in db/listings.db