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static.go
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static.go
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package static
import (
"github.com/infraboard/mcube/v2/grpc/balancer/wrr"
"google.golang.org/grpc/resolver"
)
const (
Scheme = "static"
)
// Following is an example name resolver implementation. Read the name
// resolution example to learn more about it.
type staticResolverBuilder struct{}
func (*staticResolverBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (resolver.Resolver, error) {
r := &staticResolver{
target: target,
cc: cc,
store: store,
}
r.start()
return r, nil
}
func (*staticResolverBuilder) Scheme() string { return Scheme }
type staticResolver struct {
target resolver.Target
cc resolver.ClientConn
store *Store
}
func (r *staticResolver) start() {
ts := r.store.Get(r.target.URL.Host)
addrs := []resolver.Address{}
for i := range ts.Items {
item := ts.Items[i]
addr := resolver.Address{Addr: item.Address}
wrr.SetWeight(&addr, item.weight)
addrs = append(addrs, addr)
}
r.cc.UpdateState(resolver.State{Addresses: addrs})
}
func (*staticResolver) ResolveNow(o resolver.ResolveNowOptions) {}
func (*staticResolver) Close() {}
func init() {
resolver.Register(&staticResolverBuilder{})
}