119 lines
2.9 KiB
Go
119 lines
2.9 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package plugin
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import (
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"context"
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"errors"
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"net"
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"sync"
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"time"
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"google.golang.org/grpc"
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"google.golang.org/grpc/connectivity"
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"google.golang.org/grpc/credentials/insecure"
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utilversion "k8s.io/apimachinery/pkg/util/version"
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"k8s.io/klog/v2"
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)
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// Plugin is a description of a DRA Plugin, defined by an endpoint
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// and the highest DRA version supported.
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type Plugin struct {
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sync.RWMutex
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conn *grpc.ClientConn
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endpoint string
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highestSupportedVersion *utilversion.Version
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}
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func (p *Plugin) getOrCreateGRPCConn() (*grpc.ClientConn, error) {
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p.Lock()
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defer p.Unlock()
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if p.conn != nil {
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return p.conn, nil
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}
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network := "unix"
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klog.V(4).InfoS(log("creating new gRPC connection"), "protocol", network, "endpoint", p.endpoint)
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conn, err := grpc.Dial(
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p.endpoint,
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grpc.WithTransportCredentials(insecure.NewCredentials()),
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grpc.WithContextDialer(func(ctx context.Context, target string) (net.Conn, error) {
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return (&net.Dialer{}).DialContext(ctx, network, target)
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}),
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)
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if err != nil {
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return nil, err
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}
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ctx, cancel := context.WithTimeout(context.Background(), time.Second)
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defer cancel()
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if ok := conn.WaitForStateChange(ctx, connectivity.Connecting); !ok {
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return nil, errors.New("timed out waiting for gRPC connection to be ready")
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}
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p.conn = conn
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return p.conn, nil
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}
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// PluginsStore holds a list of DRA Plugins.
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type PluginsStore struct {
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sync.RWMutex
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store map[string]*Plugin
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}
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// Get lets you retrieve a DRA Plugin by name.
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// This method is protected by a mutex.
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func (s *PluginsStore) Get(pluginName string) *Plugin {
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s.RLock()
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defer s.RUnlock()
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return s.store[pluginName]
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}
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// Set lets you save a DRA Plugin to the list and give it a specific name.
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// This method is protected by a mutex.
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func (s *PluginsStore) Set(pluginName string, plugin *Plugin) {
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s.Lock()
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defer s.Unlock()
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if s.store == nil {
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s.store = make(map[string]*Plugin)
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}
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s.store[pluginName] = plugin
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}
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// Delete lets you delete a DRA Plugin by name.
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// This method is protected by a mutex.
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func (s *PluginsStore) Delete(pluginName string) {
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s.Lock()
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defer s.Unlock()
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delete(s.store, pluginName)
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}
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// Clear deletes all entries in the store.
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// This methiod is protected by a mutex.
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func (s *PluginsStore) Clear() {
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s.Lock()
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defer s.Unlock()
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s.store = make(map[string]*Plugin)
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}
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