/* Copyright 2018 The Kubernetes Authors. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. */ package stats import ( "fmt" "os" "path/filepath" cadvisorapiv2 "github.com/google/cadvisor/info/v2" metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" "k8s.io/apimachinery/pkg/types" statsapi "k8s.io/kubelet/pkg/apis/stats/v1alpha1" kubecontainer "k8s.io/kubernetes/pkg/kubelet/container" "k8s.io/kubernetes/pkg/kubelet/kuberuntime" "k8s.io/kubernetes/pkg/volume" ) // PodEtcHostsPathFunc is a function to fetch a etc hosts path by pod uid and whether etc host path is supported by the runtime type PodEtcHostsPathFunc func(podUID types.UID) string // metricsProviderByPath maps a path to its metrics provider type metricsProviderByPath map[string]volume.MetricsProvider // HostStatsProvider defines an interface for providing host stats associated with pod. type HostStatsProvider interface { // getPodLogStats gets stats associated with pod log usage getPodLogStats(podNamespace, podName string, podUID types.UID, rootFsInfo *cadvisorapiv2.FsInfo) (*statsapi.FsStats, error) // getPodContainerLogStats gets stats associated with container log usage getPodContainerLogStats(podNamespace, podName string, podUID types.UID, containerName string, rootFsInfo *cadvisorapiv2.FsInfo) (*statsapi.FsStats, error) // getPodEtcHostsStats gets stats associated with pod etc-hosts usage getPodEtcHostsStats(podUID types.UID, rootFsInfo *cadvisorapiv2.FsInfo) (*statsapi.FsStats, error) } type hostStatsProvider struct { // osInterface is the interface for syscalls. osInterface kubecontainer.OSInterface // podEtcHostsPathFunc fetches a pod etc hosts path by uid. podEtcHostsPathFunc PodEtcHostsPathFunc // podLogsDirectory is the root directory path for pod logs. podLogsDirectory string } // NewHostStatsProvider returns a new HostStatsProvider type struct. func NewHostStatsProvider(osInterface kubecontainer.OSInterface, podEtcHostsPathFunc PodEtcHostsPathFunc, podLogsDirectory string) HostStatsProvider { return hostStatsProvider{ osInterface: osInterface, podEtcHostsPathFunc: podEtcHostsPathFunc, podLogsDirectory: podLogsDirectory, } } func (h hostStatsProvider) getPodLogStats(podNamespace, podName string, podUID types.UID, rootFsInfo *cadvisorapiv2.FsInfo) (*statsapi.FsStats, error) { metricsByPath, err := h.podLogMetrics(podNamespace, podName, podUID) if err != nil { return nil, err } return metricsByPathToFsStats(metricsByPath, rootFsInfo) } // getPodContainerLogStats gets stats for container func (h hostStatsProvider) getPodContainerLogStats(podNamespace, podName string, podUID types.UID, containerName string, rootFsInfo *cadvisorapiv2.FsInfo) (*statsapi.FsStats, error) { metricsByPath, err := h.podContainerLogMetrics(podNamespace, podName, podUID, containerName) if err != nil { return nil, err } return metricsByPathToFsStats(metricsByPath, rootFsInfo) } // getPodEtcHostsStats gets status for pod etc hosts usage func (h hostStatsProvider) getPodEtcHostsStats(podUID types.UID, rootFsInfo *cadvisorapiv2.FsInfo) (*statsapi.FsStats, error) { // Runtimes may not support etc hosts file (Windows with docker) podEtcHostsPath := h.podEtcHostsPathFunc(podUID) // Some pods have an explicit /etc/hosts mount and the Kubelet will not create an etc-hosts file for them if _, err := os.Stat(podEtcHostsPath); os.IsNotExist(err) { return nil, nil } metrics := volume.NewMetricsDu(podEtcHostsPath) hostMetrics, err := metrics.GetMetrics() if err != nil { return nil, fmt.Errorf("failed to get stats %v", err) } result := rootFsInfoToFsStats(rootFsInfo) usedBytes := uint64(hostMetrics.Used.Value()) inodesUsed := uint64(hostMetrics.InodesUsed.Value()) result.UsedBytes = addUsage(result.UsedBytes, &usedBytes) result.InodesUsed = addUsage(result.InodesUsed, &inodesUsed) result.Time = maxUpdateTime(&result.Time, &hostMetrics.Time) return result, nil } func (h hostStatsProvider) podLogMetrics(podNamespace, podName string, podUID types.UID) (metricsProviderByPath, error) { podLogsDirectoryPath := kuberuntime.BuildPodLogsDirectory(h.podLogsDirectory, podNamespace, podName, podUID) return h.fileMetricsByDir(podLogsDirectoryPath) } func (h hostStatsProvider) podContainerLogMetrics(podNamespace, podName string, podUID types.UID, containerName string) (metricsProviderByPath, error) { podContainerLogsDirectoryPath := kuberuntime.BuildContainerLogsDirectory(h.podLogsDirectory, podNamespace, podName, podUID, containerName) return h.fileMetricsByDir(podContainerLogsDirectoryPath) } // fileMetricsByDir returns metrics by path for each file under specified directory func (h hostStatsProvider) fileMetricsByDir(dirname string) (metricsProviderByPath, error) { files, err := h.osInterface.ReadDir(dirname) if err != nil { return nil, err } results := metricsProviderByPath{} for _, f := range files { if f.IsDir() { continue } // Only include *files* under pod log directory. fpath := filepath.Join(dirname, f.Name()) results[fpath] = volume.NewMetricsDu(fpath) } return results, nil } // metricsByPathToFsStats converts a metrics provider by path to fs stats func metricsByPathToFsStats(metricsByPath metricsProviderByPath, rootFsInfo *cadvisorapiv2.FsInfo) (*statsapi.FsStats, error) { result := rootFsInfoToFsStats(rootFsInfo) for fpath, metrics := range metricsByPath { hostMetrics, err := metrics.GetMetrics() if err != nil { return nil, fmt.Errorf("failed to get fsstats for %q: %v", fpath, err) } usedBytes := uint64(hostMetrics.Used.Value()) inodesUsed := uint64(hostMetrics.InodesUsed.Value()) result.UsedBytes = addUsage(result.UsedBytes, &usedBytes) result.InodesUsed = addUsage(result.InodesUsed, &inodesUsed) result.Time = maxUpdateTime(&result.Time, &hostMetrics.Time) } return result, nil } // rootFsInfoToFsStats is a utility to convert rootFsInfo into statsapi.FsStats func rootFsInfoToFsStats(rootFsInfo *cadvisorapiv2.FsInfo) *statsapi.FsStats { return &statsapi.FsStats{ Time: metav1.NewTime(rootFsInfo.Timestamp), AvailableBytes: &rootFsInfo.Available, CapacityBytes: &rootFsInfo.Capacity, InodesFree: rootFsInfo.InodesFree, Inodes: rootFsInfo.Inodes, } }