Add tasks table and API

progress will be tracked with this table instead of being in-process
like progress.js

src/routes/tasks.js

@@ -0,0 +1,39 @@
+'use strict';
+
+exports = module.exports = {
+    getProgress: getProgress,
+    stopTask: stopTask
+};
+
+let assert = require('assert'),
+    HttpError = require('connect-lastmile').HttpError,
+    HttpSuccess = require('connect-lastmile').HttpSuccess,
+    TaskError = require('../tasks.js').TaskError,
+    tasks = require('../tasks.js');
+
+function auditSource(req) {
+    var ip = req.headers['x-forwarded-for'] || req.connection.remoteAddress || null;
+    return { ip: ip, username: req.user ? req.user.username : null, userId: req.user ? req.user.id : null };
+}
+
+function stopTask(req, res, next) {
+    assert.strictEqual(typeof req.params.taskId, 'string');
+
+    tasks.stopTask(req.params.taskId, auditSource(req), function (error) {
+        if (error && error.reason === TaskError.NOT_FOUND) return next(new HttpError(404, 'No such task'));
+        if (error) return next(new HttpError(500, error));
+
+        next(new HttpSuccess(204, {}));
+    });
+}
+
+function getProgress(req, res, next) {
+    assert.strictEqual(typeof req.params.taskId, 'string');
+
+    tasks.getProgress(req.params.taskId, function (error, progress) {
+        if (error && error.reason === TaskError.NOT_FOUND) return next(new HttpError(404, 'No such task'));
+        if (error) return next(new HttpError(500, error));
+
+        next(new HttpSuccess(200, progress));
+    });
+}