csi_metrics.go

Documentation: k8s.io/kubernetes/pkg/volume/csi

     1  /*
     2  Copyright 2019 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 csi
    18  
    19  import (
    20  	"context"
    21  	"fmt"
    22  	"time"
    23  
    24  	"google.golang.org/grpc"
    25  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    26  	servermetrics "k8s.io/kubernetes/pkg/kubelet/server/metrics"
    27  	"k8s.io/kubernetes/pkg/volume"
    28  	volumeutil "k8s.io/kubernetes/pkg/volume/util"
    29  	volumetypes "k8s.io/kubernetes/pkg/volume/util/types"
    30  )
    31  
    32  var _ volume.MetricsProvider = &metricsCsi{}
    33  
    34  // metricsCsi represents a MetricsProvider that calculates the used,free and
    35  // capacity information for volume using volume path.
    36  
    37  type metricsCsi struct {
    38  	// the directory path the volume is mounted to.
    39  	targetPath string
    40  
    41  	// Volume handle or id
    42  	volumeID string
    43  
    44  	//csiClient with cache
    45  	csiClientGetter
    46  }
    47  
    48  // NewMetricsCsi creates a new metricsCsi with the Volume ID and path.
    49  func NewMetricsCsi(volumeID string, targetPath string, driverName csiDriverName) volume.MetricsProvider {
    50  	mc := &metricsCsi{volumeID: volumeID, targetPath: targetPath}
    51  	mc.csiClientGetter.driverName = driverName
    52  	return mc
    53  }
    54  
    55  func (mc *metricsCsi) GetMetrics() (*volume.Metrics, error) {
    56  	startTime := time.Now()
    57  	defer servermetrics.CollectVolumeStatCalDuration(string(mc.csiClientGetter.driverName), startTime)
    58  	currentTime := metav1.Now()
    59  	ctx, cancel := context.WithTimeout(context.Background(), csiTimeout)
    60  	defer cancel()
    61  	// Get CSI client
    62  	csiClient, err := mc.csiClientGetter.Get()
    63  	if err != nil {
    64  		// Treat the absence of the CSI driver as a transient error
    65  		// See https://github.com/kubernetes/kubernetes/issues/120268
    66  		return nil, volumetypes.NewTransientOperationFailure(err.Error())
    67  	}
    68  	// Check whether "GET_VOLUME_STATS" is set
    69  	volumeStatsSet, err := csiClient.NodeSupportsVolumeStats(ctx)
    70  	if err != nil {
    71  		return nil, err
    72  	}
    73  
    74  	// if plugin doesnot support volume status, return.
    75  	if !volumeStatsSet {
    76  		return nil, volume.NewNotSupportedErrorWithDriverName(
    77  			string(mc.csiClientGetter.driverName))
    78  	}
    79  	// Get Volumestatus
    80  	metrics, err := csiClient.NodeGetVolumeStats(ctx, mc.volumeID, mc.targetPath)
    81  	if err != nil {
    82  		return nil, err
    83  	}
    84  	if metrics == nil {
    85  		return nil, fmt.Errorf("csi.NodeGetVolumeStats returned nil metrics for volume %s", mc.volumeID)
    86  	}
    87  	//set recorded time
    88  	metrics.Time = currentTime
    89  	return metrics, nil
    90  }
    91  
    92  // MetricsManager defines the metrics manager for CSI operation
    93  type MetricsManager struct {
    94  	driverName string
    95  }
    96  
    97  // NewCSIMetricsManager creates a CSIMetricsManager object
    98  func NewCSIMetricsManager(driverName string) *MetricsManager {
    99  	cmm := MetricsManager{
   100  		driverName: driverName,
   101  	}
   102  	return &cmm
   103  }
   104  
   105  type additionalInfo struct {
   106  	Migrated string
   107  }
   108  type additionalInfoKeyType struct{}
   109  
   110  var additionalInfoKey additionalInfoKeyType
   111  
   112  // RecordMetricsInterceptor is a grpc interceptor that is used to
   113  // record CSI operation
   114  func (cmm *MetricsManager) RecordMetricsInterceptor(
   115  	ctx context.Context,
   116  	method string,
   117  	req, reply interface{},
   118  	cc *grpc.ClientConn,
   119  	invoker grpc.UnaryInvoker,
   120  	opts ...grpc.CallOption) error {
   121  	start := time.Now()
   122  	err := invoker(ctx, method, req, reply, cc, opts...)
   123  	duration := time.Since(start)
   124  	// Check if this is migrated operation
   125  	additionalInfoVal := ctx.Value(additionalInfoKey)
   126  	migrated := "false"
   127  	if additionalInfoVal != nil {
   128  		additionalInfoVal, ok := additionalInfoVal.(additionalInfo)
   129  		if !ok {
   130  			return err
   131  		}
   132  		migrated = additionalInfoVal.Migrated
   133  	}
   134  	// Record the metric latency
   135  	volumeutil.RecordCSIOperationLatencyMetrics(cmm.driverName, method, err, duration, migrated)
   136  
   137  	return err
   138  }
   139
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