请求流程
1 Application 入口
wsgigw = httpgateway.WSGIGateway(httpgateway.get_func_name,logger.errlog,logger.acclog,apicube)
status, headders, content = wsgigw.process(environ)
start_response(status, headders)
return content其中
httpgateway.get_func_name : 根据 environ['PATH_INFO'] 找到对应的 url
logger.errlog : 错误日志文件
logger.acclog : 访问日志文件
apicube : protocols 字典，key 为 func name，value 为 Protocol 实例
wsgigw.process 主要就是做三件事
1) 封装 request
2) 路由查询
3) 将请求 request 发到对应的 protocol 实例（对 handler 进行的封装）
对 wsgienv 进行封装为 req
req = Request(reqid, wsgienv, ip) : req 对 wsgienv 进行封装，此 req 会以参数传入后端 handler 函数中
路由查询
将 req 传给对 api 封装后的 protocol 实例
protocol =
self._protocols.get(funcname)httpstatus, headers, content = protocol(req)
protocol 实例是对 handler 函数进行的包装，进行统一日志管理以及参数校验等操作
+---------------------------------------------------------+
| WEB brower |
+---------------------------------------------------------+
| ^ ^ ^
| | | |
|HTTP request | | |
| | | |
-- +---V-----------------------------------------------------+
/ | HTTPServer | WSGI server
| | +-------------------+ put +-------------------+ |
| | |ThreadPool(Queue) <+-----+ HTTPConnection | |
| | |+---------------+ | | +---------------+ | |
| | ||WorkerThread | | | |HTTPRequest | | |
| | |+---------------+ | | +---------------+ | |
| | +-------------------+ +-------------------+ |
| +---------------------------------------------------------+
| /------------\ ^ ^ ^
| | environ | | | |
| \------------/ | | |
| .............|...................|.......|..........|.........WSGI
| | | | |
| +------V-------+ | | |
| | req | | | |
| +--------------+ | | |
Butterfly | | | |
| +------V-------+ | | |
| |apiname_getter| | | |
| +--------------+ | | |
| | | | |
| +--------V--------+ False +--+--+ | |
| |is_protocol_exist|------>| 400 | | |
| +-----------------+ +-----+ | |
| | | |
| | (protocol_process) | |
| V | |
| +-----------------+ | |
| | protocol | Exception +-----+ |
| | +-------------+ |---------------| 500 | |
| | |/app1/handler| | +-----+ |
| | |/app2/handler| | +----------------------------+
| | +-------------+ |---------------|httpstatus, headers, content|
\ +-----------------+ +----------------------------+
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