srap/bin/server

#!/usr/bin/env node

"use strict";

// let realConsoleLog = console.log.bind(console);
// console.log = function(...args) {
// 	realConsoleLog(`[console.log called from ${(new Error).stack.split("\n")[2].replace(/^\s* at /, "")}]`);
// 	realConsoleLog(...args);
// };

// let realConsoleError = console.error.bind(console);
// console.error = function(...args) {
// 	realConsoleError(`[console.error called from ${(new Error).stack.split("\n")[2].replace(/^\s* at /, "")}]`);
// 	realConsoleError(...args);
// };

// FIXME: All of this is a work-in-progress, zero stability guarantees!

const Promise = require("bluebird");
const express = require("express");
const expressPromiseRouter = require("express-promise-router");
const assert = require("assert");
const path = require("path");

const pipe = require("@promistream/pipe");
const fromNodeStream = require("@promistream/from-node-stream");
const map = require("@promistream/map");

const { testValue } = require("@validatem/core");
const matchesFormat = require("@validatem/matches-format");
const isString = require("@validatem/is-string");

const initialize = require("../src/initialize");
const errors = require("../src/errors");

assert(process.argv.length >= 4);
let configurationPath = process.argv[2];
let listenHost = process.argv[3];

let absoluteConfigurationPath = path.join(process.cwd(), configurationPath);
let configuration = require(absoluteConfigurationPath);

return Promise.try(() => {
	// FIXME: Deduplicate this with kernel! Also other common wiring across binaries...
	return initialize({
		knexfile: {
			client: "pg",
			connection: configuration.database,
			pool: { min: 0, max: 32 },
			migrations: { tableName: "srap_knex_migrations" }
		}
	});
}).then((state) => {
	let { db, knex } = state;

	const queries = require("../src/queries")(state);

	let app = express();
	let router = expressPromiseRouter();
	
	// router.get("/items/:id", (req, res) => {
	// 	return Promise.try(() => {
	// 		return db.Item.query(knex).findById(req.params.id);
	// 	}).then((item) => {
	// 		if (item != null) {
	// 			res.json(item);
	// 		} else {
	// 			throw new errors.NotFound(`No such item exists`);
	// 		}
	// 	});
	// });
	
	// router.delete("/items/:id", (req, res) => {
	// 	return Promise.try(() => {
	// 		return db.Item.query(knex)
	// 			.findById(req.params.id)
	// 			.delete();
	// 	}).then((affectedRows) => {
	// 		if (affectedRows > 0) {
	// 			res.status(204).end();
	// 		} else {
	// 			throw new errors.NotFound(`No such item exists`);
	// 		}
	// 	});
	// });

	// // MARKER: Stub out routes, replace error implementation, add response generation for HTTP errors
	
	// router.get("/items/:id/metadata", (req, res) => {
		
	// });
	
	// router.get("/items/:id/operations", (req, res) => {
		
	// });
	
	// router.get("/items/:id/operations/:operation/expire", (req, res) => {
		
	// });
	
	// router.post("/items/add", (req, res) => {
		
	// });
	
	// router.put("/items/add/:id", (req, res) => {
		
	// });
	
	// router.get("/items/:id", (req, res) => {
		
	// });

	router.get("/updates", (req, res) => {
		// FIXME: Proper Express integration for Validatem
		let isValid = testValue(req.query, {
			since: matchesFormat(/^[0-9]+$/),
			prefix: isString
		});

		if (isValid) {
			let timestamp = (req.query.since != null)
				? new Date(parseInt(req.query.since))
				: undefined;

			return pipe([
				queries.getUpdates(knex, { prefix: req.query.prefix, timestamp: timestamp }),
				map((item) => JSON.stringify(item) + "\n"),
				fromNodeStream(res)
			]).read();
		} else {
			res.status(422).send("Invalid request");
		}
	});
	
	app.use(router);
	app.listen({ host: listenHost, port: 3000 }, () => {
		console.log("Server listening on port 3000");
	});
});