聊聊dubbo-go-proxy的hostFilter

序

本文主要研究一下dubbo-go-proxy的hostFilter

hostFilter

dubbo-go-proxy/pkg/filter/host/host.go

// hostFilter is a filter for host.
type hostFilter struct {
	host string
}

// New create host filter.
func New(host string) filter.Filter {
	return &hostFilter{host: host}
}

hostFilter的New根據host創建hostFilter

Do

dubbo-go-proxy/pkg/filter/host/host.go

func (f hostFilter) Do() fc.FilterFunc {
	return func(c fc.Context) {
		f.doHostFilter(c.(*contexthttp.HttpContext))
	}
}

func (f hostFilter) doHostFilter(c *contexthttp.HttpContext) {
	c.Request.Host = f.host
	c.Next()
}

Do方法執行doHostFilter方法，該方法將f.host設置給c.Request.Host，然後執行c.Next()

httpFilter

dubbo-go-proxy/pkg/proxy/listener.go

func httpFilter(ctx *h.HttpContext, request fc.IntegrationRequest) {
	if len(request.Host) != 0 {
		ctx.AppendFilterFunc(host.New(request.Host).Do())
	}
	if len(request.Path) != 0 {
		ctx.AppendFilterFunc(replacepath.New(request.Path).Do())
	}
}

httpFilter方法通過AppendFilterFunc將host.New(request.Host)追加到Filters中

小結

dubbo-go-proxy的hostFilter將f.host設置給c.Request.Host，然後執行c.Next()。

doc

• dubbo-go-proxy