You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
74 lines
1.5 KiB
74 lines
1.5 KiB
package discovery
|
|
|
|
import (
|
|
"net/url"
|
|
"time"
|
|
|
|
"github.com/go-kratos/kratos/v2/log"
|
|
"github.com/go-kratos/kratos/v2/registry"
|
|
"google.golang.org/grpc/attributes"
|
|
"google.golang.org/grpc/resolver"
|
|
)
|
|
|
|
type discoveryResolver struct {
|
|
w registry.Watcher
|
|
cc resolver.ClientConn
|
|
log *log.Helper
|
|
}
|
|
|
|
func (r *discoveryResolver) watch() {
|
|
for {
|
|
ins, err := r.w.Next()
|
|
if err != nil {
|
|
r.log.Errorf("Failed to watch discovery endpoint: %v", err)
|
|
time.Sleep(time.Second)
|
|
continue
|
|
}
|
|
r.update(ins)
|
|
}
|
|
}
|
|
|
|
func (r *discoveryResolver) update(ins []*registry.ServiceInstance) {
|
|
var addrs []resolver.Address
|
|
for _, in := range ins {
|
|
endpoint, err := parseEndpoint(in.Endpoints)
|
|
if err != nil {
|
|
r.log.Errorf("Failed to parse discovery endpoint: %v", err)
|
|
continue
|
|
}
|
|
addr := resolver.Address{
|
|
ServerName: in.Name,
|
|
Attributes: parseAttributes(in.Metadata),
|
|
Addr: endpoint,
|
|
}
|
|
addrs = append(addrs, addr)
|
|
}
|
|
r.cc.UpdateState(resolver.State{Addresses: addrs})
|
|
}
|
|
|
|
func (r *discoveryResolver) Close() {
|
|
r.w.Close()
|
|
}
|
|
|
|
func (r *discoveryResolver) ResolveNow(options resolver.ResolveNowOptions) {}
|
|
|
|
func parseEndpoint(endpoints []string) (string, error) {
|
|
for _, e := range endpoints {
|
|
u, err := url.Parse(e)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
if u.Scheme == "grpc" {
|
|
return u.Host, nil
|
|
}
|
|
}
|
|
return "", nil
|
|
}
|
|
|
|
func parseAttributes(md map[string]string) *attributes.Attributes {
|
|
var pairs []interface{}
|
|
for k, v := range md {
|
|
pairs = append(pairs, k, v)
|
|
}
|
|
return attributes.New(pairs)
|
|
}
|
|
|