github.com/manishgzp/blob-csi-driver-aks@v0.5.0/pkg/blobfuseplugin/main.go (about) 1 /* 2 Copyright 2017 The Kubernetes Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package main 18 19 import ( 20 "context" 21 "flag" 22 "fmt" 23 "net" 24 "net/http" 25 "os" 26 "strings" 27 28 "sigs.k8s.io/blobfuse-csi-driver/pkg/blobfuse" 29 30 "k8s.io/component-base/metrics/legacyregistry" 31 "k8s.io/klog" 32 ) 33 34 func init() { 35 _ = flag.Set("logtostderr", "true") 36 } 37 38 var ( 39 endpoint = flag.String("endpoint", "unix://tmp/csi.sock", "CSI endpoint") 40 nodeID = flag.String("nodeid", "", "node id") 41 version = flag.Bool("version", false, "Print the version and exit.") 42 metricsAddress = flag.String("metrics-address", "0.0.0.0:29624", "export the metrics") 43 kubeconfig = flag.String("kubeconfig", "", "Absolute path to the kubeconfig file. Required only when running out of cluster.") 44 ) 45 46 func main() { 47 klog.InitFlags(nil) 48 flag.Parse() 49 if *version { 50 info, err := blobfuse.GetVersionYAML() 51 if err != nil { 52 klog.Fatalln(err) 53 } 54 fmt.Println(info) 55 os.Exit(0) 56 } 57 if *nodeID == "" { 58 klog.Warning("nodeid is empty") 59 } 60 61 exportMetrics() 62 handle() 63 os.Exit(0) 64 } 65 66 func handle() { 67 driver := blobfuse.NewDriver(*nodeID) 68 if driver == nil { 69 klog.Fatalln("Failed to initialize blobfuse CSI Driver") 70 } 71 driver.Run(*endpoint, *kubeconfig) 72 } 73 74 func exportMetrics() { 75 l, err := net.Listen("tcp", *metricsAddress) 76 if err != nil { 77 klog.Warningf("failed to get listener for metrics endpoint: %v", err) 78 return 79 } 80 serve(context.Background(), l, serveMetrics) 81 } 82 83 func serve(ctx context.Context, l net.Listener, serveFunc func(net.Listener) error) { 84 path := l.Addr().String() 85 klog.V(2).Infof("set up prometheus server on %v", path) 86 go func() { 87 defer l.Close() 88 if err := serveFunc(l); err != nil { 89 klog.Fatalf("serve failure(%v), address(%v)", err, path) 90 } 91 }() 92 } 93 94 func serveMetrics(l net.Listener) error { 95 m := http.NewServeMux() 96 m.Handle("/metrics", legacyregistry.Handler()) //nolint, because azure cloud provider uses legacyregistry currently 97 return trapClosedConnErr(http.Serve(l, m)) 98 } 99 100 func trapClosedConnErr(err error) error { 101 if err == nil { 102 return nil 103 } 104 if strings.Contains(err.Error(), "use of closed network connection") { 105 return nil 106 } 107 return err 108 }