mirror of
https://github.com/eggjs/egg.git
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353 lines
8.8 KiB
JavaScript
353 lines
8.8 KiB
JavaScript
'use strict';
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const delegate = require('delegates');
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const ContextLogger = require('egg-logger').EggContextLogger;
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const Cookies = require('egg-cookies');
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const co = require('co');
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const ContextHttpClient = require('../../lib/core/context_httpclient');
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const util = require('../../lib/core/util');
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const HELPER = Symbol('Context#helper');
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const VIEW = Symbol('Context#view');
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const LOCALS = Symbol('Context#locals');
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const LOCALS_LIST = Symbol('Context#localsList');
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const COOKIES = Symbol('Context#cookies');
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const CONTEXT_LOGGERS = Symbol('Context#logger');
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const CONTEXT_HTTPCLIENT = Symbol('Context#httpclient');
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const proto = module.exports = {
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get cookies() {
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if (!this[COOKIES]) {
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this[COOKIES] = new Cookies(this, this.app.keys);
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}
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return this[COOKIES];
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},
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/**
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* 默认的 role 检测失败处理
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* session 插件等可以覆盖 ctx.roleFailureHandler(action) 来重置
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* @method Context#roleFailureHandler
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* @param {String} action 导致失败的角色
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*/
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roleFailureHandler(action) {
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const message = `Forbidden, required role: ${action}`;
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this.status = 403;
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if (this.isAjax) {
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this.body = {
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message,
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stat: 'deny',
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};
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} else {
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this.body = message;
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}
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},
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/**
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* Get a wrapper httpclient instance contain ctx in the hold request process
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*
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* @return {ContextHttpClient} the wrapper httpclient instance
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*/
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get httpclient() {
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if (!this[CONTEXT_HTTPCLIENT]) {
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this[CONTEXT_HTTPCLIENT] = new ContextHttpClient(this);
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}
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return this[CONTEXT_HTTPCLIENT];
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},
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/**
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* Shortcut for httpclient.curl
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*
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* @method Context#curl
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* @param {String|Object} url - request url address.
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* @param {Object} [options] - options for request.
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* @return {Object} see {@link ContextHttpClient#curl}
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*/
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* curl(url, options) {
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return yield this.httpclient.curl(url, options);
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},
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/**
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* App 的 {@link Router} 实例，你可以用它生成 URL Path, 比如 `{@link Router#pathFor|router.pathFor}`
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*
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* @member {Router} Context#router
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* @since 1.0.0
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* @example
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* ```js
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* this.router.pathFor('post', { id: 12 });
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* ```
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*/
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get router() {
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return this.app.router;
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},
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/**
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* 用于记录 egg Request 周期的耗时，比如总耗时, View 渲染耗时
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*
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* 如果你有自定义的访问，希望往 RequestLog 里面增加统计信息，可以往 ctx.runtime['xx'] 里面写信息
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* egg 会自动将它们打印出来。
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* @member {Object} Context#runtime
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* @property {Float} rt - 总耗时
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* @property {Float} view - View Render 耗时
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* @property {Float} buc - Buc 查询耗时
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* @property {Float} mysql - MySQL 查询耗时
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* @property {Float} hsf - HSF 查询耗时
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* @property {Float} tr - TR 查询耗时
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* @property {Float} http - 外部 HTTP 请求耗时
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* @since 1.0.0
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*/
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get runtime() {
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this._runtime = this._runtime || {};
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return this._runtime;
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},
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/**
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* 记录上下文相关的操作时间
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* @param {String} event 与 {@link Application#instrument} 一致
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* @param {String} action 与 {@link Application#instrument} 一致
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* @return {Object} 与 {@link Application#instrument} 一致
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*/
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instrument(event, action) {
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return this.app.instrument(event, action, this);
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},
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/**
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* 获取 helper 实例
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* @member {Helper} Context#helper
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* @since 1.0.0
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*/
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get helper() {
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if (!this[HELPER]) {
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this[HELPER] = new this.app.Helper(this);
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}
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return this[HELPER];
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},
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/**
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* 默认返回一个空对象，需要实现这个接口
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*
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* 插件需要实现一个内部约定 getter: `_tracer`
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* @member {Object} Context#tracer
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*/
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get tracer() {
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return this._tracer || {};
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},
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/**
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* Wrap app.loggers with context infomation,
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* if a custom logger is defined by naming aLogger, then you can `ctx.getLogger('aLogger')`
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* @param {String} name - logger name
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* @return {Logger} logger
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*/
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getLogger(name) {
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let cache = this[CONTEXT_LOGGERS];
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if (!cache) {
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cache = this[CONTEXT_LOGGERS] = {};
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}
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// read from cache
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if (cache[name]) return cache[name];
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// get no exist logger
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const appLogger = this.app.getLogger(name);
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if (!appLogger) return null;
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// write to cache
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cache[name] = new ContextLogger(this, appLogger);
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return cache[name];
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},
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/**
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* Logger for Application, wrapping app.coreLogger with context infomation
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* @member {ContextLogger} Context#logger
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* @since 1.0.0
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* @example
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* ```js
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* this.logger.info('some request data: %j', this.request.body);
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* this.logger.warn('WARNING!!!!');
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* ```
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*/
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get logger() {
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return this.getLogger('logger');
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},
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/**
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* Logger for frameworks and plugins,
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* wrapping app.coreLogger with context infomation
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* @member {ContextLogger} Context#coreLogger
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* @since 1.0.0
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*/
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get coreLogger() {
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return this.getLogger('coreLogger');
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},
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/**
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* 获取 view 实例
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* @return {View} view 实例
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*/
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get view() {
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if (!this[VIEW]) {
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this[VIEW] = new this.app.View(this);
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}
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return this[VIEW];
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},
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/**
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* 渲染页面模板后直接返回 response
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* @method Context#render
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* @param {String} name 模板文件名
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* @param {Object} [locals] 需要放到页面上的变量
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* @see Context#renderView
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*/
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* render(name, locals) {
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this.body = yield this.renderView(name, locals);
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},
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/**
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* 渲染页面模板，返回字符串
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* @method Context#renderView
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* @param {String} name 模板文件名
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* @param {Object} [locals] 需要放到页面上的变量
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* @return {String} 渲染后的字符串.
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* @see View#render
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*/
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* renderView(name, locals) {
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const ins = this.instrument('view', `render ${name}`);
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const body = yield this.view.render(name, locals);
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ins.end();
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return body;
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},
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/**
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* 渲染模板字符串
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* @method Context#renderString
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* @param {String} tpl 模板字符串
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* @param {Object} [locals] 需要放到页面上的变量
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* @return {String} 渲染后的字符串
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* @see View#renderString
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*/
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* renderString(tpl, locals) {
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return yield this.view.renderString(tpl, locals);
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},
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/**
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* locals 为模板使用的变量，可以在任何地方设置 locals，在渲染模板的时候会合并这些变量。
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* app.locals 和 this.locals 最大的区别是作用域不同，app.locals 是全局的，this.locals 是一个请求的。
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*
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* 设置 locals 的时候只支持对象，他会和原来的数据进行合并
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*
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* ```js
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* this.locals = {
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* a: 1
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* };
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* this.locals = {
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* b: 1
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* };
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* this.locals.c = 1;
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* console.log(this.locals);
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* {
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* a: 1,
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* b: 1,
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* c: 1,
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* };
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* ```
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*
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* 注意：**this.locals 有缓存，只在第一次访问 this.locals 时合并 app.locals。**
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*
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* @member {Object} Context#locals
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*/
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get locals() {
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if (!this[LOCALS]) {
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this[LOCALS] = util.assign({}, this.app.locals);
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}
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if (this[LOCALS_LIST] && this[LOCALS_LIST].length) {
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util.assign(this[LOCALS], this[LOCALS_LIST]);
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this[LOCALS_LIST] = null;
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}
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return this[LOCALS];
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},
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set locals(val) {
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if (!this[LOCALS_LIST]) {
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this[LOCALS_LIST] = [];
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}
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this[LOCALS_LIST].push(val);
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},
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/**
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* egg 使用 locals 作为服务端传递给模板中的变量挂载容器
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* 当开启 egg-locals 插件时，this.state 返回 this.locals
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* @member {Object} state
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*/
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get state() {
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return this.locals || {};
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},
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set state(val) {
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this.locals = val;
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},
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/**
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* Run generator function in the background
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* @param {Generator} scope - generator function, the first args is ctx
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* ```js
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* this.body = 'hi';
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*
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* this.runInBackground(function* saveUserInfo(ctx) {
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* yield ctx.mysql.query(sql);
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* yield ctx.curl(url);
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* });
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* ```
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*/
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runInBackground(scope) {
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const ctx = this;
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const start = Date.now();
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const taskName = scope.name || '-';
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co(function* () {
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yield scope(ctx);
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ctx.coreLogger.info('[egg:background] task:%s success (%dms)', taskName, Date.now() - start);
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}).catch(err => {
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ctx.coreLogger.info('[egg:background] task:%s fail (%dms)', taskName, Date.now() - start);
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ctx.coreLogger.error(err);
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});
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},
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};
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/**
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* Context delegation.
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*/
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/**
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* @member {Boolean} Context#isAjax
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* @see Request#isAjax
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* @since 1.0.0
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*/
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/**
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* @member {Array} Context#queries
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* @see Request#queries
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* @since 1.0.0
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*/
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/**
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* @member {Void} Context#jsonp
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* @see Response#jsonp
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* @since 1.0.0
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*/
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/**
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* @member {Number} Context#realStatus
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* @see Response#realStatus
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* @since 1.0.0
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*/
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delegate(proto, 'request')
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.getter('isAjax')
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.getter('acceptJSON')
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.getter('queries')
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.getter('accept')
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.access('ip');
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delegate(proto, 'response')
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.setter('jsonp')
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.access('realStatus');
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