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| const co = require('co');
const lodash = require('lodash');
const moment = require('moment');
module.exports = {
/**
* get module, controller, action from path
* @param path
* @returns {{module, controller, action}}
*/
getModuleControllerAction(path) {
let paths = [];
if (path != '/') {
paths = path.substr(1, path.length).split('/');
}
let module = koahub.config('default_module');
let controller = koahub.config('default_controller');
let action = koahub.config('default_action');
switch (paths.length) {
case 0:
break;
case 1:
module = paths[0];
break;
case 2:
module = paths[0];
controller = paths[1];
break;
default:
module = paths.shift();
action = paths.pop();
if (koahub.controllers[`/${module}/${paths.join('/')}`]) {
controller = paths.join('/');
break;
}
paths.push(action);
if (koahub.controllers[`/${module}/${paths.join('/')}`]) {
controller = paths.join('/');
action = koahub.config('default_action');
break;
}
action = paths.pop();
controller = paths.join('/');
}
return {module, controller, action};
},
/**
* run controller && action controller
* @param ctx
* @param next
* @param args
* @returns {Promise.<*>}
*/
async runController(ctx, next, ...args){
const {module, controller, action} = this.getModuleControllerAction(ctx.path);
const ctrl = koahub.controllers[`/${module}/${controller}`];
if (ctrl) {
const _ctrl = new ctrl(ctx, next);
const methods = Object.getOwnPropertyNames(ctrl.prototype);
// constructor不响应404,中断执行
if (ctx.status != 404) {
return;
}
if (lodash.includes(methods, action)) {
let result;
let parseResult = function (data) {
if (data) {
result = data;
}
};
// 控制器初始化
if (lodash.includes(methods, '_initialize')) {
parseResult(await this.getPromiseFunction(_ctrl, '_initialize')(...args));
}
// 控制器初始化不响应404,中断执行
if (ctx.status != 404) {
return;
}
// 控制器前置
if (lodash.includes(methods, '_before')) {
parseResult(await this.getPromiseFunction(_ctrl, '_before')(...args));
}
// 控制器前置不响应404,中断执行
if (ctx.status != 404) {
return;
}
// 方法前置
if (lodash.includes(methods, `_before_${action}`)) {
parseResult(await this.getPromiseFunction(_ctrl, `_before_${action}`)(...args));
}
// 方法前置不响应404,中断执行
if (ctx.status != 404) {
return;
}
parseResult(await this.getPromiseFunction(_ctrl, action)(...args));
// 不响应404,中断执行
if (ctx.status != 404) {
return;
}
// 方法后置
if (lodash.includes(methods, `_after_${action}`)) {
parseResult(await this.getPromiseFunction(_ctrl, `_after_${action}`)(...args));
}
// 方法后置不响应404,中断执行
if (ctx.status != 404) {
return;
}
// 控制器后置
if (lodash.includes(methods, '_after')) {
parseResult(await this.getPromiseFunction(_ctrl, '_after')(...args));
}
// 控制器后置不响应404,中断执行
if (ctx.status != 404) {
return;
}
return result;
} else {
// 控制器空操作
if (lodash.includes(methods, '_empty')) {
return this.runController(Object.assign(ctx, {path: `/${module}/${controller}/_empty`}), next, ...args);
} else {
this.log('Not Found Action');
return;
}
}
} else {
if (koahub.controllers[`/${module}/empty`]) {
return this.runController(Object.assign(ctx, {path: `/${module}/empty/${action}`}), next, ...args);
} else {
this.log('Not Found Controller');
return;
}
}
},
/**
* run http filter ctx && controller methods
* @param ctx
* @param next
* @param args
* @returns {Promise.<*|Promise.<*>>}
*/
async runHttp(ctx, next, ...args) {
const {module, controller, action} = this.getModuleControllerAction(ctx.path);
if (!lodash.includes(koahub.modules, module)) {
this.log('Not Found Module');
return;
}
// 移除控制器中跟ctx中同名的属性
for (let name in ctx) {
if (typeof ctx[name] !== 'function' && action === name) {
throw new Error(`Don\'t use the "${action}" action in the controller`);
}
}
// 过滤控制器默认方法
const filters = ['constructor', '_initialize', '_before', `_before_${action}`, `_after_${action}`, '_after', '_empty'];
if (lodash.includes(filters, action)) {
this.log('Don\'t access the "${action}"');
return;
}
return await this.runController(ctx, next, ...args);
},
/**
* Check whether a function is generator.
*
* @param {Function} fn
* @return {Boolean}
*/
isGeneratorFunction(fn) {
return typeof fn === 'function' &&
fn.constructor &&
fn.constructor.name === 'GeneratorFunction'
},
/**
* Parase express middleware to koa middleware
* @param fn
* @returns {Function}
*/
expressMiddlewareToKoaMiddleware(fn) {
return function (ctx, next) {
if (fn.length < 3) {
fn(ctx.req, ctx.res);
return next();
} else {
return new Promise((resolve, reject) => {
fn(ctx.req, ctx.res, err => {
if (err) reject(err)
else resolve(next())
})
})
}
}
},
/**
* generator to promise
* @param instance
* @param method
* @returns {Function}
*/
getPromiseFunction(instance, method) {
if (this.isGeneratorFunction(instance[method])) {
return co.wrap(instance[method]).bind(instance);
}
return instance[method].bind(instance);
},
/**
* return es6 module or common module
* @param file
* @returns {*}
*/
requireDefault(file){
const lib = require(file);
if (lib.hasOwnProperty('default') && Object.keys(lib).length === 1) {
return lib.default;
} else {
return lib;
}
},
/**
* console format
* @param log
* @param type
*/
log(log, type = 'log') {
if (typeof log === 'string') {
console[type](`[${moment().format('YYYY-MM-DD HH:mm:ss')}] [Koahub] ${log}`);
} else {
const msg = log.stack || log.toString();
console[type]();
console[type](`[${moment().format('YYYY-MM-DD HH:mm:ss')}] [Koahub] [Log]`);
console[type](msg);
console[type]();
}
},
/**
* array customizer
* @param objValue
* @param srcValue
* @returns {string|*|Array.<T>}
*/
arrayCustomizer(objValue, srcValue) {
if (lodash.isArray(objValue)) {
return objValue.concat(srcValue);
}
}
} |