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根据host创建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方法执行doHostFilter方法，该方法将f.host设置给c.Request.Host，然后执行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方法通过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，然后执行c.Next()。
