filter

type BaseFilter struct{}

type Context interface {
	StartAt() time.Time
	EndAt() time.Time

	OriginRequest() *fasthttp.RequestCtx
	ForwardRequest() *fasthttp.Request
	Response() *fasthttp.Response

	API() *metapb.API
	DispatchNode() *metapb.DispatchNode
	Server() *metapb.Server
	Analysis() *util.Analysis

	SetAttr(key string, value interface{})
	GetAttr(key string) interface{}
}

type Filter interface {
	Name() string
	Init(cfg string) error

	Pre(c Context) (statusCode int, err error)
	Post(c Context) (statusCode int, err error)
	PostErr(c Context)
}