Moved the nodejs agent to its own subfolder to make room for my haskell agent

nodejs/lib/systems.js

@@ -0,0 +1,68 @@
+import * as api from './api.js';
+import * as db from '../database/systems.js';
+
+// Retrieves a shipyard's information for ctx.symbol
+export async function shipyard(ctx) {
+	const systemSymbol = ctx.symbol.match(/([^-]+-[^-]+)/)[1]; // TODO generalise this extraction
+	console.log(systemSymbol);
+	return await api.send({endpoint: `/systems/${systemSymbol}/waypoints/${ctx.symbol}/shipyard`});
+}
+
+// Retrieves the system's information for ctx.symbol and caches it in the database
+export async function system(ctx) {
+	let s = db.getSystem(ctx.symbol);
+	if (s === null) {
+		const response = await api.send({endpoint: `/systems/${ctx.symbol}`});
+		if (response.error !== undefined) {
+			switch(response.error.code) {
+			case 404:
+				throw `Error retrieving info for system ${ctx.symbol}: ${response.error.message}`;
+			default: // yet unhandled error
+				throw response;
+			}
+		}
+		s = response.data;
+		db.setSystem(s);
+	}
+	return s;
+}
+
+// Retrieves a list of waypoints that have a specific ctx.trait like a SHIPYARD or a MARKETPLACE in the system ctx.symbol
+export async function trait(ctx) {
+	const w = await waypoints(ctx);
+	return w.filter(s => s.traits.some(t => t.symbol === ctx.trait));
+}
+
+// Retrieves a list of waypoints that have a specific ctx.type like ASTEROID_FIELD in the system ctx.symbol
+export async function type(ctx, response) {
+	const w = await waypoints(ctx);
+	return w.filter(s => s.type === ctx.type);
+}
+
+// Retrieves the system's information for ctx.symbol and caches it in the database
+export async function waypoints(ctx) {
+	await system(ctx);
+	let updated = db.getSystemUpdated(ctx.symbol);
+	// TODO handle uncharted systems
+	if (updated === null) {
+		let waypoints = [];
+		for (let page=1; true; ++page) {
+			const response = await api.send({endpoint: `/systems/${ctx.symbol}/waypoints?limit=20&page=${page}`, priority: 98});
+			if (response.error !== undefined) {
+				switch(response.error.code) {
+				case 404:
+					throw `Error retrieving waypoints for system ${ctx.symbol}: ${response.error.message}`;
+				default: // yet unhandled error
+					throw response;
+				}
+			}
+			waypoints = waypoints.concat(response.data);
+			if (response.meta.total <= response.meta.limit * page) {
+				break;
+			}
+		}
+		db.setSystemWaypoints(ctx.symbol, waypoints);
+		return waypoints;
+	}
+	return db.getSystem(ctx.symbol).waypoints;
+}