forked from google/cadvisor
/
docker.go
183 lines (162 loc) · 5.33 KB
/
docker.go
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// Copyright 2016 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.
// Provides global docker information.
package docker
import (
"fmt"
"regexp"
"strconv"
"strings"
dockertypes "github.com/docker/engine-api/types"
"golang.org/x/net/context"
"github.com/google/cadvisor/info/v1"
"github.com/google/cadvisor/machine"
)
func Status() (v1.DockerStatus, error) {
client, err := Client()
if err != nil {
return v1.DockerStatus{}, fmt.Errorf("unable to communicate with docker daemon: %v", err)
}
dockerInfo, err := client.Info(context.Background())
if err != nil {
return v1.DockerStatus{}, err
}
return StatusFromDockerInfo(dockerInfo), nil
}
func StatusFromDockerInfo(dockerInfo dockertypes.Info) v1.DockerStatus {
out := v1.DockerStatus{}
out.Version = VersionString()
out.APIVersion = APIVersionString()
out.KernelVersion = machine.KernelVersion()
out.OS = dockerInfo.OperatingSystem
out.Hostname = dockerInfo.Name
out.RootDir = dockerInfo.DockerRootDir
out.Driver = dockerInfo.Driver
out.ExecDriver = dockerInfo.ExecutionDriver
out.NumImages = dockerInfo.Images
out.NumContainers = dockerInfo.Containers
out.DriverStatus = make(map[string]string, len(dockerInfo.DriverStatus))
for _, v := range dockerInfo.DriverStatus {
out.DriverStatus[v[0]] = v[1]
}
return out
}
func Images() ([]v1.DockerImage, error) {
client, err := Client()
if err != nil {
return nil, fmt.Errorf("unable to communicate with docker daemon: %v", err)
}
images, err := client.ImageList(context.Background(), dockertypes.ImageListOptions{All: false})
if err != nil {
return nil, err
}
out := []v1.DockerImage{}
const unknownTag = "<none>:<none>"
for _, image := range images {
if len(image.RepoTags) == 1 && image.RepoTags[0] == unknownTag {
// images with repo or tags are uninteresting.
continue
}
di := v1.DockerImage{
ID: image.ID,
RepoTags: image.RepoTags,
Created: image.Created,
VirtualSize: image.VirtualSize,
Size: image.Size,
}
out = append(out, di)
}
return out, nil
}
// Checks whether the dockerInfo reflects a valid docker setup, and returns it if it does, or an
// error otherwise.
func ValidateInfo() (*dockertypes.Info, error) {
client, err := Client()
if err != nil {
return nil, fmt.Errorf("unable to communicate with docker daemon: %v", err)
}
dockerInfo, err := client.Info(context.Background())
if err != nil {
return nil, fmt.Errorf("failed to detect Docker info: %v", err)
}
// Fall back to version API if ServerVersion is not set in info.
if dockerInfo.ServerVersion == "" {
version, err := client.ServerVersion(context.Background())
if err != nil {
return nil, fmt.Errorf("unable to get docker version: %v", err)
}
dockerInfo.ServerVersion = version.Version
}
version, err := parseVersion(dockerInfo.ServerVersion, version_re, 3)
if err != nil {
return nil, err
}
if version[0] < 1 {
return nil, fmt.Errorf("cAdvisor requires docker version %v or above but we have found version %v reported as %q", []int{1, 0, 0}, version, dockerInfo.ServerVersion)
}
// Check that the libcontainer execdriver is used if the version is < 1.11
// (execution drivers are no longer supported as of 1.11).
if version[0] <= 1 && version[1] <= 10 &&
!strings.HasPrefix(dockerInfo.ExecutionDriver, "native") {
return nil, fmt.Errorf("docker found, but not using native exec driver")
}
if dockerInfo.Driver == "" {
return nil, fmt.Errorf("failed to find docker storage driver")
}
return &dockerInfo, nil
}
func Version() ([]int, error) {
return parseVersion(VersionString(), version_re, 3)
}
func APIVersion() ([]int, error) {
return parseVersion(APIVersionString(), apiversion_re, 2)
}
func VersionString() string {
docker_version := "Unknown"
client, err := Client()
if err == nil {
version, err := client.ServerVersion(context.Background())
if err == nil {
docker_version = version.Version
}
}
return docker_version
}
func APIVersionString() string {
docker_api_version := "Unknown"
client, err := Client()
if err == nil {
version, err := client.ServerVersion(context.Background())
if err == nil {
docker_api_version = version.APIVersion
}
}
return docker_api_version
}
func parseVersion(version_string string, regex *regexp.Regexp, length int) ([]int, error) {
matches := regex.FindAllStringSubmatch(version_string, -1)
if len(matches) != 1 {
return nil, fmt.Errorf("version string \"%v\" doesn't match expected regular expression: \"%v\"", version_string, regex.String())
}
version_string_array := matches[0][1:]
version_array := make([]int, length)
for index, version_str := range version_string_array {
version, err := strconv.Atoi(version_str)
if err != nil {
return nil, fmt.Errorf("error while parsing \"%v\" in \"%v\"", version_str, version_string)
}
version_array[index] = version
}
return version_array, nil
}