@nodeswork/sbase/koa/utils.js

Basic REST api foundation from Nodeswork.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const _ = require("underscore");
const debug_1 = require("debug");
const d = debug_1.default('sbase:utils');
/**
 * Compose `middleware` returning a fully valid middleware comprised of all
 * those which are passed.
 */
function compose(middleware) {
    if (!Array.isArray(middleware)) {
        throw new TypeError('Middleware stack must be an array!');
    }
    for (const fn of middleware) {
        if (typeof fn !== 'function') {
            throw new TypeError('Middleware must be composed of functions!');
        }
    }
    /**
     * @param {Object} context
     * @return {Promise}
     * @api public
     */
    return function (context, next) {
        // last called middleware #
        let index = -1;
        const rid = `${context.request.method} ${context.request.path} ${context.requestId}`;
        return dispatch.call(this, 0);
        function dispatch(i) {
            if (i <= index) {
                return Promise.reject(new Error('next() called multiple times'));
            }
            index = i;
            const fn = i === middleware.length ? next : middleware[i];
            if (!fn)
                return Promise.resolve();
            const start = _.now();
            const name = fn.name || '<anonymous>';
            try {
                if (name !== 'bound dispatch') {
                    d('[%O] Begin of middleware %O', rid, name);
                }
                return Promise.resolve(fn.call(this, context, dispatch.bind(this, i + 1)));
            }
            catch (err) {
                return Promise.reject(err);
            }
            finally {
                const end = _.now();
                if (name !== 'bound dispatch') {
                    d('[%O] End of middleware %O, duration: %O', rid, name, end - start);
                }
            }
        }
    };
}
exports.compose = compose;
function isPromise(promise) {
    return promise && promise.then != null;
}
exports.isPromise = isPromise;

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