hubs/src/context.js

``` Caryl ------ courier3 / \ / \ courier1 courier2

const url = require('url')

/**
 * request context
 * @desc lifecycle: 存在于整个请求
 * 
 * @class Context
 */
class Context{
    /**
     * Creates an instance of Context.
     * @param {any} items  请求的配置
     * @param {any} state  请求的状态配置
     */
    constructor(reqItems, state){
        this.reqItems = reqItems
        this.state = state 
        this.payloads = Object.create(null)
        this.errs = Object.create(null)
    }

}


Context.preprocess = function(reqItems, protocol) {
        Object.keys(reqItems).forEach(key=>{
            var context = reqItems[key]
            var prot = 'static'
            if (context.url) {
                var urlObj = url.parse(context.url)
                prot = urlObj.protocol.substr(0, urlObj.protocol.length - 1)
            }
            context.protocol = prot
            context.requestor = protocol.use(prot)
        })
        
        return reqItems
    }

module.exports = Context