98 lines
3.0 KiB
Go
98 lines
3.0 KiB
Go
package client
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import (
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"fmt"
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"sync"
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"time"
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"google.golang.org/grpc"
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"k8s.io/klog/v2"
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estimatorservice "github.com/karmada-io/karmada/pkg/estimator/service"
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"github.com/karmada-io/karmada/pkg/util"
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"github.com/karmada-io/karmada/pkg/util/names"
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)
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// SchedulerEstimatorCache is a cache that stores gRPC clients of all the cluster accurate scheduler estimator.
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type SchedulerEstimatorCache struct {
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lock sync.RWMutex
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estimator map[string]*clientWrapper
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}
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// NewSchedulerEstimatorCache returns an accurate scheduler estimator cache.
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func NewSchedulerEstimatorCache() *SchedulerEstimatorCache {
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return &SchedulerEstimatorCache{
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estimator: make(map[string]*clientWrapper),
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}
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}
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type clientWrapper struct {
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connection *grpc.ClientConn
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client estimatorservice.EstimatorClient
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}
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// IsEstimatorExist checks whether the cluster estimator exists in the cache.
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func (c *SchedulerEstimatorCache) IsEstimatorExist(name string) bool {
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c.lock.RLock()
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defer c.lock.RUnlock()
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_, exist := c.estimator[name]
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return exist
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}
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// AddCluster adds a grpc connection and associated client into the cache.
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func (c *SchedulerEstimatorCache) AddCluster(name string, connection *grpc.ClientConn, client estimatorservice.EstimatorClient) {
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c.lock.Lock()
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defer c.lock.Unlock()
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// If more than one worker have established connections at the same time,
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// only the first one will be used. The ladder ones would be abandoned.
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if _, exist := c.estimator[name]; exist {
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_ = connection.Close()
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return
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}
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c.estimator[name] = &clientWrapper{
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connection: connection,
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client: client,
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}
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}
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// DeleteCluster closes the connection and deletes it from the cache.
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func (c *SchedulerEstimatorCache) DeleteCluster(name string) {
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c.lock.Lock()
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defer c.lock.Unlock()
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es, exist := c.estimator[name]
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if !exist {
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return
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}
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_ = es.connection.Close()
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delete(c.estimator, name)
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}
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// GetClient returns the gRPC client of a cluster accurate replica estimator.
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func (c *SchedulerEstimatorCache) GetClient(name string) (estimatorservice.EstimatorClient, error) {
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c.lock.RLock()
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defer c.lock.RUnlock()
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es, exist := c.estimator[name]
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if !exist {
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return nil, fmt.Errorf("cluster %s does not exist in estimator cache", name)
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}
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return es.client, nil
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}
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// EstablishConnection establishes a new gRPC connection with the specified cluster scheduler estimator.
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func EstablishConnection(name string, estimatorCache *SchedulerEstimatorCache, port int) error {
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if estimatorCache.IsEstimatorExist(name) {
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return nil
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}
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serverAddr := fmt.Sprintf("%s:%d", names.GenerateEstimatorServiceName(name), port)
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klog.Infof("Start dialing estimator server(%s) of cluster(%s).", serverAddr, name)
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cc, err := util.Dial(serverAddr, 5*time.Second)
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if err != nil {
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klog.Errorf("Failed to dial cluster(%s): %v.", name, err)
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return err
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}
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c := estimatorservice.NewEstimatorClient(cc)
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estimatorCache.AddCluster(name, cc, c)
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klog.Infof("Connection with estimator server(%s) of cluster(%s) has been established.", serverAddr, name)
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return nil
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}
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