metrics_du.go

Documentation: k8s.io/kubernetes/pkg/volume

     1  /*
     2  Copyright 2014 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 volume
    18  
    19  import (
    20  	"k8s.io/apimachinery/pkg/api/resource"
    21  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    22  	"k8s.io/kubernetes/pkg/volume/util/fs"
    23  )
    24  
    25  var _ MetricsProvider = &metricsDu{}
    26  
    27  // metricsDu represents a MetricsProvider that calculates the used and
    28  // available Volume space by calling fs.DiskUsage() and gathering
    29  // filesystem info for the Volume path.
    30  type metricsDu struct {
    31  	// the directory path the volume is mounted to.
    32  	path string
    33  }
    34  
    35  // NewMetricsDu creates a new metricsDu with the Volume path.
    36  func NewMetricsDu(path string) MetricsProvider {
    37  	return &metricsDu{path}
    38  }
    39  
    40  // GetMetrics calculates the volume usage and device free space by executing "du"
    41  // and gathering filesystem info for the Volume path.
    42  // See MetricsProvider.GetMetrics
    43  func (md *metricsDu) GetMetrics() (*Metrics, error) {
    44  	metrics := &Metrics{Time: metav1.Now()}
    45  	if md.path == "" {
    46  		return metrics, NewNoPathDefinedError()
    47  	}
    48  
    49  	err := md.getDiskUsage(metrics)
    50  	if err != nil {
    51  		return metrics, err
    52  	}
    53  
    54  	err = md.getFsInfo(metrics)
    55  	if err != nil {
    56  		return metrics, err
    57  	}
    58  
    59  	return metrics, nil
    60  }
    61  
    62  // getDiskUsage writes metrics.Used and metric.InodesUsed from fs.DiskUsage
    63  func (md *metricsDu) getDiskUsage(metrics *Metrics) error {
    64  	usage, err := fs.DiskUsage(md.path)
    65  	if err != nil {
    66  		return err
    67  	}
    68  	metrics.Used = resource.NewQuantity(usage.Bytes, resource.BinarySI)
    69  	metrics.InodesUsed = resource.NewQuantity(usage.Inodes, resource.BinarySI)
    70  	return nil
    71  }
    72  
    73  // getFsInfo writes metrics.Capacity and metrics.Available from the filesystem
    74  // info
    75  func (md *metricsDu) getFsInfo(metrics *Metrics) error {
    76  	available, capacity, _, inodes, inodesFree, _, err := fs.Info(md.path)
    77  	if err != nil {
    78  		return NewFsInfoFailedError(err)
    79  	}
    80  	metrics.Available = resource.NewQuantity(available, resource.BinarySI)
    81  	metrics.Capacity = resource.NewQuantity(capacity, resource.BinarySI)
    82  	metrics.Inodes = resource.NewQuantity(inodes, resource.BinarySI)
    83  	metrics.InodesFree = resource.NewQuantity(inodesFree, resource.BinarySI)
    84  	return nil
    85  }
    86
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