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  }