/
resolver.go
75 lines (61 loc) · 1.66 KB
/
resolver.go
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package resolver
import (
"fmt"
"math/rand"
"strings"
"github.com/pubgo/lug/registry"
"github.com/pubgo/xlog"
"google.golang.org/grpc/attributes"
"google.golang.org/grpc/resolver"
)
const (
//direct connect to service, it is can be used in k8s or other systems without service discovery
DirectScheme = "direct"
DiscovScheme = "discov"
EndpointSepChar = ','
)
var (
EndpointSep = fmt.Sprintf("%c", EndpointSepChar)
Replica = 2
)
func init() {
resolver.Register(&directBuilder{})
resolver.Register(&discovBuilder{})
}
type baseResolver struct {
cc resolver.ClientConn
r registry.Watcher
}
func (r *baseResolver) Close() {
if r.r != nil {
r.r.Stop()
}
}
func (r *baseResolver) ResolveNow(options resolver.ResolveNowOptions) {
xlog.Info("[grpc] ResolveNow")
}
// 关于 grpc 命名的介绍
// https://github.com/grpc/grpc/blob/master/doc/naming.md
func BuildDirectTarget(endpoints []string) string {
return fmt.Sprintf("%s:///%s", DirectScheme, strings.Join(endpoints, EndpointSep))
}
func BuildDiscovTarget(endpoints []string, key string) string {
return fmt.Sprintf("%s://%s/%s", DiscovScheme, strings.Join(endpoints, EndpointSep), key)
}
//对targets打散
func reshuffle(targets []resolver.Address) []resolver.Address {
rand.Shuffle(len(targets), func(i, j int) { targets[i], targets[j] = targets[j], targets[i] })
return targets
}
// 创建新的Address
func newAddr(addr string, name string) resolver.Address {
return resolver.Address{
Addr: addr,
Attributes: attributes.New(),
ServerName: name,
}
}
// 组合服务的id和replica序列号
func getServiceUniqueId(name string, id int) string {
return fmt.Sprintf("%s-%d", name, id)
}