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docker.go
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// Copyright 2014 Google Inc. All Rights Reserved.
//
// 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 pages
import (
"fmt"
"net/http"
"net/url"
"path"
"strconv"
"time"
"github.com/google/cadvisor/container/docker"
info "github.com/google/cadvisor/info/v1"
"github.com/google/cadvisor/manager"
"github.com/golang/glog"
)
const DockerPage = "/docker/"
func toStatusKV(status info.DockerStatus) ([]keyVal, []keyVal) {
ds := []keyVal{
{Key: "Driver", Value: status.Driver},
}
for k, v := range status.DriverStatus {
ds = append(ds, keyVal{Key: k, Value: v})
}
return []keyVal{
{Key: "Docker Version", Value: status.Version},
{Key: "Docker API Version", Value: status.APIVersion},
{Key: "Kernel Version", Value: status.KernelVersion},
{Key: "OS Version", Value: status.OS},
{Key: "Host Name", Value: status.Hostname},
{Key: "Docker Root Directory", Value: status.RootDir},
{Key: "Execution Driver", Value: status.ExecDriver},
{Key: "Number of Images", Value: strconv.Itoa(status.NumImages)},
{Key: "Number of Containers", Value: strconv.Itoa(status.NumContainers)},
}, ds
}
func serveDockerPage(m manager.Manager, w http.ResponseWriter, u *url.URL) {
start := time.Now()
// The container name is the path after the handler
containerName := u.Path[len(DockerPage)-1:]
rootDir := getRootDir(containerName)
var data *pageData
if containerName == "/" {
// Get the containers.
reqParams := info.ContainerInfoRequest{
NumStats: 0,
}
conts, err := m.AllDockerContainers(&reqParams)
if err != nil {
http.Error(w, fmt.Sprintf("failed to get container %q with error: %v", containerName, err), http.StatusNotFound)
return
}
subcontainers := make([]link, 0, len(conts))
for _, cont := range conts {
subcontainers = append(subcontainers, link{
Text: getContainerDisplayName(cont.ContainerReference),
Link: path.Join(rootDir, DockerPage, docker.ContainerNameToDockerId(cont.ContainerReference.Name)),
})
}
// Get Docker status
status, err := m.DockerInfo()
if err != nil {
http.Error(w, fmt.Sprintf("failed to get docker info: %v", err), http.StatusInternalServerError)
return
}
dockerStatus, driverStatus := toStatusKV(status)
// Get Docker Images
images, err := m.DockerImages()
if err != nil {
http.Error(w, fmt.Sprintf("failed to get docker images: %v", err), http.StatusInternalServerError)
return
}
dockerContainersText := "Docker Containers"
data = &pageData{
DisplayName: dockerContainersText,
ParentContainers: []link{
{
Text: dockerContainersText,
Link: path.Join(rootDir, DockerPage),
}},
Subcontainers: subcontainers,
Root: rootDir,
DockerStatus: dockerStatus,
DockerDriverStatus: driverStatus,
DockerImages: images,
}
} else {
// Get the container.
reqParams := info.ContainerInfoRequest{
NumStats: 60,
}
cont, err := m.DockerContainer(containerName[1:], &reqParams)
if err != nil {
http.Error(w, fmt.Sprintf("failed to get container %q with error: %v", containerName, err), http.StatusNotFound)
return
}
displayName := getContainerDisplayName(cont.ContainerReference)
// Make a list of the parent containers and their links
var parentContainers []link
parentContainers = append(parentContainers, link{
Text: "Docker Containers",
Link: path.Join(rootDir, DockerPage),
})
parentContainers = append(parentContainers, link{
Text: displayName,
Link: path.Join(rootDir, DockerPage, docker.ContainerNameToDockerId(cont.Name)),
})
// Get the MachineInfo
machineInfo, err := m.GetMachineInfo()
if err != nil {
http.Error(w, fmt.Sprintf("failed to get machine info: %v", err), http.StatusInternalServerError)
return
}
data = &pageData{
DisplayName: displayName,
ContainerName: escapeContainerName(cont.Name),
ParentContainers: parentContainers,
Spec: cont.Spec,
Stats: cont.Stats,
MachineInfo: machineInfo,
ResourcesAvailable: cont.Spec.HasCpu || cont.Spec.HasMemory || cont.Spec.HasNetwork,
CpuAvailable: cont.Spec.HasCpu,
MemoryAvailable: cont.Spec.HasMemory,
NetworkAvailable: cont.Spec.HasNetwork,
FsAvailable: cont.Spec.HasFilesystem,
CustomMetricsAvailable: cont.Spec.HasCustomMetrics,
Root: rootDir,
}
}
err := pageTemplate.Execute(w, data)
if err != nil {
glog.Errorf("Failed to apply template: %s", err)
}
glog.V(5).Infof("Request took %s", time.Since(start))
return
}