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containers.go
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containers.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.
// Page for /containers/
package pages
import (
"fmt"
"html/template"
"net/http"
"net/url"
"path"
"strconv"
"strings"
"time"
info "github.com/google/cadvisor/info/v1"
"github.com/google/cadvisor/manager"
"github.com/golang/glog"
)
const ContainersPage = "/containers/"
// from http://golang.org/doc/effective_go.html#constants
type ByteSize float64
const (
_ = iota
// KB - kilobyte
KB ByteSize = 1 << (10 * iota)
// MB - megabyte
MB
// GB - gigabyte
GB
// TB - terabyte
TB
// PB - petabyte
PB
// EB - exabyte
EB
// ZB - zettabyte
ZB
// YB - yottabyte
YB
)
func (b ByteSize) Size() string {
for _, i := range [...]ByteSize{YB, ZB, EB, PB, TB, GB, MB, KB} {
if b >= i {
return fmt.Sprintf("%.2f", b/i)
}
}
return fmt.Sprintf("%.2f", b)
}
func (b ByteSize) Unit() string {
switch {
case b >= YB:
return "YB"
case b >= ZB:
return "ZB"
case b >= EB:
return "EB"
case b >= PB:
return "PB"
case b >= TB:
return "TB"
case b >= GB:
return "GB"
case b >= MB:
return "MB"
case b >= KB:
return "KB"
}
return "B"
}
var funcMap = template.FuncMap{
"printMask": printMask,
"printCores": printCores,
"printShares": printShares,
"printSize": printSize,
"printUnit": printUnit,
}
func printMask(mask string, numCores int) interface{} {
masks := make([]string, numCores)
activeCores := getActiveCores(mask)
for i := 0; i < numCores; i++ {
coreClass := "inactive-cpu"
if activeCores[i] {
coreClass = "active-cpu"
}
masks[i] = fmt.Sprintf("<span class=\"%s\">%d</span>", coreClass, i)
}
return template.HTML(strings.Join(masks, " "))
}
func getActiveCores(mask string) map[int]bool {
activeCores := make(map[int]bool)
for _, corebits := range strings.Split(mask, ",") {
cores := strings.Split(corebits, "-")
if len(cores) == 1 {
index, err := strconv.Atoi(cores[0])
if err != nil {
// Ignore malformed strings.
continue
}
activeCores[index] = true
} else if len(cores) == 2 {
start, err := strconv.Atoi(cores[0])
if err != nil {
continue
}
end, err := strconv.Atoi(cores[1])
if err != nil {
continue
}
for i := start; i <= end; i++ {
activeCores[i] = true
}
}
}
return activeCores
}
func printCores(millicores *uint64) string {
cores := float64(*millicores) / 1000
return strconv.FormatFloat(cores, 'f', 3, 64)
}
func printShares(shares *uint64) string {
return fmt.Sprintf("%d", *shares)
}
// Size after which we consider memory to be "unlimited". This is not
// MaxInt64 due to rounding by the kernel.
const maxMemorySize = uint64(1 << 62)
func printSize(bytes uint64) string {
if bytes >= maxMemorySize {
return "unlimited"
}
return ByteSize(bytes).Size()
}
func printUnit(bytes uint64) string {
if bytes >= maxMemorySize {
return ""
}
return ByteSize(bytes).Unit()
}
func serveContainersPage(m manager.Manager, w http.ResponseWriter, u *url.URL) error {
start := time.Now()
// The container name is the path after the handler
containerName := u.Path[len(ContainersPage)-1:]
// Get the container.
reqParams := info.ContainerInfoRequest{
NumStats: 60,
}
cont, err := m.GetContainerInfo(containerName, &reqParams)
if err != nil {
return fmt.Errorf("failed to get container %q with error: %v", containerName, err)
}
displayName := getContainerDisplayName(cont.ContainerReference)
// Get the MachineInfo
machineInfo, err := m.GetMachineInfo()
if err != nil {
return err
}
rootDir := getRootDir(containerName)
// Make a list of the parent containers and their links
pathParts := strings.Split(string(cont.Name), "/")
parentContainers := make([]link, 0, len(pathParts))
parentContainers = append(parentContainers, link{
Text: "root",
Link: path.Join(rootDir, ContainersPage),
})
for i := 1; i < len(pathParts); i++ {
// Skip empty parts.
if pathParts[i] == "" {
continue
}
parentContainers = append(parentContainers, link{
Text: pathParts[i],
Link: path.Join(rootDir, ContainersPage, path.Join(pathParts[1:i+1]...)),
})
}
// Build the links for the subcontainers.
subcontainerLinks := make([]link, 0, len(cont.Subcontainers))
for _, sub := range cont.Subcontainers {
if !m.Exists(sub.Name) {
continue
}
subcontainerLinks = append(subcontainerLinks, link{
Text: getContainerDisplayName(sub),
Link: path.Join(rootDir, ContainersPage, sub.Name),
})
}
data := &pageData{
DisplayName: displayName,
ContainerName: escapeContainerName(cont.Name),
ParentContainers: parentContainers,
Subcontainers: subcontainerLinks,
Spec: cont.Spec,
Stats: cont.Stats,
MachineInfo: machineInfo,
IsRoot: cont.Name == "/",
ResourcesAvailable: cont.Spec.HasCpu || cont.Spec.HasMemory || cont.Spec.HasNetwork || cont.Spec.HasFilesystem,
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 nil
}
// Build a relative path to the root of the container page.
func getRootDir(containerName string) string {
// The root is at: container depth
levels := (strings.Count(containerName, "/"))
return strings.Repeat("../", levels)
}