noctjs/program/run.js

noctjs云函数框架

"use strict";

const middleware = require("./middleware");

module.exports = async ({
  event,
  context,
  startup
}) => {

  /**
   * 构建noct对象
   */
  let noct = {
    // 模式：路由模式 route/匹配模式 match
    mode: "",
    // 基础配置
    config: {},
    // 请求
    request: {
      service: "", // 匹配到的service
      action: "", // 匹配到的action
      data: {}, // 客户端传入的参数
      isHttp: false, // 是否是HTTP请求
      route: undefined, // 客户端传入的路由，只有当mode为route时该属性才有值
      routeTemplate: undefined, // 成功匹配的路由模板，只有当mode为route时该属性才有值
      httpMethod: undefined // HTTP Method，只有当mode为route时该属性才有值
    },
    // 响应
    response: {
      mpserverlessComposedResponse: true, // 使用阿里云返回集成响应是需要此字段为true
      statusCode: 200,
      headers: {
        "content-type": event.headers && event.headers["content-type"] || "application/json" // 默认响应json格式数据
      },
      body: undefined
    },
    // 异常
    exception: undefined,
    // 路由
    routes: [],
    // 中间件
    middlewares: [],
    // 过滤器
    filters: [],
    /**
     * 扩展方法，在服务中引入并使用其他服务
     */
    useService: obj => {
      return new obj({
        event,
        context,
        noct
      });
    }
  };

  /**
   * 应用属性
   */
  let app = {
    // 初始化
    init: ({
      baseDir = "",
      serviceDir = "/services/",
      serviceKey = "service",
      actionKey = "action",
      dataKey = "data",
      enableMatchMode = true,
      matchIgnore = []
    }) => {
      noct.config.baseDir = baseDir;
      noct.config.serviceDir = serviceDir;
      noct.config.serviceKey = serviceKey;
      noct.config.actionKey = actionKey;
      noct.config.dataKey = dataKey;
      noct.config.enableMatchMode = enableMatchMode;
      noct.config.matchIgnore = matchIgnore;
    },
    // 添加中间件
    use: middleware => {
      noct.middlewares.push(middleware);
    },
    // 路由
    route: {
      // 路由添加
      add: routes => {
        if (routes.constructor === Array) {
          noct.routes = noct.routes.concat(routes);
        } else if (routes.constructor === Object) {
          noct.routes.push(routes);
        }
      }
    },
    // 过滤器
    filter: {
      // 过滤器添加
      add: filters => {
        if (filters.constructor === Array) {
          noct.filters = noct.filters.concat(filters);
        } else if (filters.constructor === Object) {
          noct.filters.push(filters);
        }
      }
    }
  }

  if (startup) {
    startup(app);
  }

  if (!noct.config.baseDir) {
    throw new Error(`"baseDir"必须配置。`);
  }

  // 使用中间件
  await middleware.use({
    event,
    context,
    noct
  });

  // console.log(noct.mode);
  // console.log(noct.response);
  if (noct.mode === "route") {
    // return noct.response 之前可以正常响应，现在会报错 The Body of Composed Response is not valid
    // 不知道是不是服务商更新后出现的bug，解决办法为JSON对象转为JSON字符串再传入body即可
    noct.response.body =
      typeof noct.response.body === "string" ?
      noct.response.body :
      JSON.stringify(noct.response.body); // route模式需要集成响应，集成响应body需要转为字符串
    return noct.response;
  } else if (noct.mode === "match") {
    return noct.response.body; // match模式不需要集成响应
  }
}