[javascript] Implementing market data gathering and caching

1 files changed, 34 insertions, 0 deletions

diff --git a/nodejs/database/markets.js b/nodejs/database/markets.js
new file mode 100644
index 0000000..522f57f
--- /dev/null
+++ b/nodejs/database/markets.js
@@ -0,0 +1,34 @@
+import db from './db.js';
+import * as utils from '../lib/utils.js';
+
+const addMarketStatement = db.prepare(`INSERT INTO markets(system, data) VALUES (?, json(?));`);
+const getMarketAtWaypointStatement = db.prepare(`SELECT data FROM markets WHERE data->>'symbol' = ?;`);
+const getMarketsInSystemStatement = db.prepare(`SELECT data FROM markets WHERE system = ?;`);
+const updateMarketStatement = db.prepare(`UPDATE markets SET data = json(:data) WHERE data->>'symbol' = :symbol;`);
+
+export function getMarketAtWaypoint(symbol) {
+    const data = getMarketAtWaypointStatement.get(symbol);
+    if (data === undefined) {
+	return null;
+    }
+    return JSON.parse(data.data);
+}
+
+export function getMarketsInSystem(symbol) {
+    const data = getMarketsInSystemStatement.get(symbol);
+    if (data === undefined) {
+	return null;
+    }
+    return JSON.parse(data.data);
+}
+
+export function setMarket(data) {
+    if (getMarketAtWaypoint(data.symbol) === null) {
+	const system = utils.systemFromWaypoint(data.symbol);
+	return addMarketStatement.run(system, JSON.stringify(data)).lastInsertRowid;
+    }
+    return updateMarketStatement.run({
+	data: JSON.stringify(data),
+	symbol: data.symbol,
+    }).changes;
+}