序

本文次要钻研一下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依据host创立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办法执行doHostFilter办法，该办法将f.host设置给c.Request.Host，而后执行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办法通过AppendFilterFunc将host.New(request.Host)追加到Filters中

小结

dubbo-go-proxy的hostFilter将f.host设置给c.Request.Host，而后执行c.Next()。

doc

  • dubbo-go-proxy