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115 lines
2.6 KiB
115 lines
2.6 KiB
package discovery
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import (
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"context"
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"encoding/json"
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"errors"
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"time"
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"google.golang.org/grpc/attributes"
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"google.golang.org/grpc/resolver"
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"github.com/go-kratos/aegis/subset"
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"github.com/go-kratos/kratos/v2/internal/endpoint"
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"github.com/go-kratos/kratos/v2/log"
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"github.com/go-kratos/kratos/v2/registry"
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)
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type discoveryResolver struct {
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w registry.Watcher
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cc resolver.ClientConn
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ctx context.Context
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cancel context.CancelFunc
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insecure bool
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debugLog bool
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selecterKey string
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subsetSize int
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}
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func (r *discoveryResolver) watch() {
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for {
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select {
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case <-r.ctx.Done():
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return
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default:
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}
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ins, err := r.w.Next()
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if err != nil {
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if errors.Is(err, context.Canceled) {
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return
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}
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log.Errorf("[resolver] Failed to watch discovery endpoint: %v", err)
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time.Sleep(time.Second)
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continue
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}
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r.update(ins)
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}
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}
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func (r *discoveryResolver) update(ins []*registry.ServiceInstance) {
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var (
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endpoints = make(map[string]struct{})
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filtered = make([]*registry.ServiceInstance, 0, len(ins))
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)
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for _, in := range ins {
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ept, err := endpoint.ParseEndpoint(in.Endpoints, endpoint.Scheme("grpc", !r.insecure))
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if err != nil {
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log.Errorf("[resolver] Failed to parse discovery endpoint: %v", err)
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continue
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}
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if ept == "" {
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continue
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}
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// filter redundant endpoints
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if _, ok := endpoints[ept]; ok {
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continue
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}
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filtered = append(filtered, in)
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}
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if r.subsetSize != 0 {
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filtered = subset.Subset(r.selecterKey, filtered, r.subsetSize)
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}
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addrs := make([]resolver.Address, 0, len(filtered))
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for _, in := range filtered {
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ept, _ := endpoint.ParseEndpoint(in.Endpoints, endpoint.Scheme("grpc", !r.insecure))
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endpoints[ept] = struct{}{}
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addr := resolver.Address{
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ServerName: in.Name,
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Attributes: parseAttributes(in.Metadata).WithValue("rawServiceInstance", in),
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Addr: ept,
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}
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addrs = append(addrs, addr)
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}
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if len(addrs) == 0 {
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log.Warnf("[resolver] Zero endpoint found,refused to write, instances: %v", ins)
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return
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}
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err := r.cc.UpdateState(resolver.State{Addresses: addrs})
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if err != nil {
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log.Errorf("[resolver] failed to update state: %s", err)
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}
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if r.debugLog {
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b, _ := json.Marshal(filtered)
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log.Infof("[resolver] update instances: %s", b)
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}
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}
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func (r *discoveryResolver) Close() {
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r.cancel()
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err := r.w.Stop()
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if err != nil {
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log.Errorf("[resolver] failed to watch top: %s", err)
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}
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}
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func (r *discoveryResolver) ResolveNow(_ resolver.ResolveNowOptions) {}
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func parseAttributes(md map[string]string) (a *attributes.Attributes) {
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for k, v := range md {
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a = a.WithValue(k, v)
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}
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return a
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}
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