Update version checking mechanism.

Checks both database schema and API versions.

lib/www/server/index.js

@@ -5,7 +5,7 @@ async function main () {
 	const version = require('./lib/version');
 	console.log("Running version", await version.describe());
 	version.compatible()
-	.then( () => {
+	.then( (versions) => {
 		const api = require('./api');
 		const ws = require('./ws');
 
@@ -17,10 +17,12 @@ async function main () {
 		const eventManagerPath = [__dirname, "events"].join("/");
 		const eventManager = fork(eventManagerPath, /*{ stdio: 'ignore' }*/);
 
+		console.info("Versions", versions);
+
 		process.on('exit', () => eventManager.kill());
 	})
-	.catch( ({current, wanted}) => {
-		console.error(`Fatal error: incompatible database schema version ${current} (wanted: ${wanted})`);
+	.catch( ({current, wanted, component}) => {
+		console.error(`Fatal error: incompatible ${component} version ${current} (wanted: ${wanted})`);
 		process.exit(1);
 	});
 }

lib/www/server/lib/version.js

@@ -2,6 +2,14 @@ const semver = require("semver");
 const { exec } = require("child_process");
 const pkg = require("../package.json");
 
+
+function compatible () {
+	return Promise.all([
+		compatible_schema(),
+		compatible_api()
+	]);
+}
+
 /** Report whether the database schema version is
  * compatible with the version required by this server.
  *
@@ -14,15 +22,30 @@ const pkg = require("../package.json");
  * @returns true if the versions are compatible,
  * false otherwise.
  */
-function compatible () {
+function compatible_schema () {
 	const { info } = require('./db');
 	return new Promise ( async (resolve, reject) => {
 		const current = await info.get(null, "version/db_schema");
 		const wanted = pkg.config.db_schema;
+		const component = "schema";
 		if (semver.satisfies(current, wanted)) {
-			resolve({current, wanted});
+			resolve({current, wanted, component});
 		} else {
-			reject({current, wanted});
+			reject({current, wanted, component});
+		}
+	});
+}
+
+function compatible_api () {
+	const api = require('../api');
+	return new Promise ( async (resolve, reject) => {
+		const current = api.locals.version;
+		const wanted = pkg.config.api;
+		const component = "api";
+		if (semver.satisfies(current, wanted)) {
+			resolve({current, wanted, component});
+		} else {
+			reject({current, wanted, component});
 		}
 	});
 }