Implemented a basic extraction loop

lib/agent.js

@@ -0,0 +1,72 @@
+import { registerAgent } from '../database/config.js';
+import * as api from './api.js';
+import * as ships from './ships.js';
+
+// This starts an extraction loop with a ship which ends when the ship's cargo is at least 90% full with only one desired good
+// ctx must must have two attributes: `ship` and `good`
+export function extract(ctx, response) {
+	if (response !== undefined) {
+		if (response.error !== undefined) {
+			switch(response.error.code) {
+			case 4000: // ship is on cooldown
+				setTimeout(extract, response.error.data.cooldown.remainingSeconds  * 1000, ctx);
+				return;
+			case 4228: // ship is full. Running the ship inventory function to list the cargo so that know if we need to sell
+				ships.ship({ship: ctx.ship, next:{action: extract, ship: ctx.ship, good: ctx.good}});
+				return;
+			default:
+				throw response;
+			}
+		}
+		if (response.data.extraction !== undefined && response.data.extraction.yield !== undefined) { // yield won't be defined if we reached this point from an inventory request
+			console.log(`${ctx.ship}: extracted ${response.data.extraction.yield.units} of ${response.data.extraction.yield.symbol}`);
+		}
+		if (response.data.cargo !== undefined && response.data.cargo.capacity * 0.9 <= response.data.cargo.units) { // > 90% full
+			const good = response.data.cargo.inventory.filter(i => i.symbol === ctx.good)[0];
+			const inventory = response.data.cargo.inventory.filter(i => i.symbol !== ctx.good);
+			if (good?.units >= response.data.cargo.capacity * 0.9) { // > 90% full
+				console.log(`ship's cargo is full with ${response.data.cargo.units} of ${ctx.good}!`);
+				return;
+			}
+			let actions = [{ action: ships.dock, ship: ctx.ship }];
+			inventory.forEach(i => actions.push({action: ships.sell, ship: ctx.ship, good: i.symbol, units: i.units}));
+			actions.push({action: ships.orbit, ship: ctx.ship});
+			actions.push({action: extract, ship: ctx.ship, good: ctx.good});
+			api.chain(actions);
+			return;
+		} else { // we need to mine more
+			if (response.data.cooldown) { // we are on cooldown, call ourselves again in a moment
+				setTimeout(extract, response.data.cooldown.remainingSeconds  * 1000, ctx);
+				return;
+			}
+		}
+	}
+	ships.extract({ship: ctx.ship, good: ctx.good, next: { action: extract, ship: ctx.ship, good: ctx.good }});
+}
+
+// This function inits the database in case we have an already registered game
+export function init(symbol, faction, token) {
+	registerAgent(symbol, faction, token);
+}
+
+// This function registers then inits the database
+export function register(symbol, faction) {
+	fetch(
+		'https://api.spacetraders.io/v2/register',
+		{
+			method: 'POST',
+			headers: {
+				'Content-Type': 'application/json',
+			},
+			body: JSON.stringify({
+				symbol: symbol,
+				faction: faction,
+			}),
+		})
+		.then(response => response.json())
+		.then(response => {
+			console.log(JSON.stringify(response, null, 2));
+			init(symbol, faction, response.data.token);
+		})
+		.catch(err => console.error(err));
+}