forked from rancher/agent
/
utils.go
executable file
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/
utils.go
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package utils
import (
"fmt"
engineCli "github.com/docker/docker/client"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/container"
"github.com/mitchellh/mapstructure"
"github.com/pkg/errors"
"github.com/rancher/agent/core/progress"
"github.com/rancher/agent/model"
"github.com/rancher/agent/utilities/constants"
revents "github.com/rancher/event-subscriber/events"
"github.com/rancher/go-rancher/v2"
"golang.org/x/net/context"
"io"
"io/ioutil"
"os"
"os/exec"
"path"
"regexp"
"strconv"
"strings"
"syscall"
"time"
)
func GetInstanceAndHost(event *revents.Event) (model.Instance, model.Host, error) {
data := event.Data
var ihm model.InstanceHostMap
if err := mapstructure.Decode(data["instanceHostMap"], &ihm); err != nil {
return model.Instance{}, model.Host{}, errors.Wrap(err, constants.GetInstanceAndHostError+"failed to marshall instancehostmap")
}
var instance model.Instance
if err := mapstructure.Decode(ihm.Instance, &instance); err != nil {
return model.Instance{}, model.Host{}, errors.Wrap(err, constants.GetInstanceAndHostError+"failed to marshall instance data")
}
var host model.Host
if err := mapstructure.Decode(ihm.Host, &host); err != nil {
return model.Instance{}, model.Host{}, errors.Wrap(err, constants.GetInstanceAndHostError+"failed to marshall host data")
}
return instance, host, nil
}
func IsNoOp(data model.ProcessData) bool {
return data.ContainerNoOpEvent
}
func AddLabel(config *container.Config, key string, value string) {
config.Labels[key] = value
}
func SearchInList(slice []string, target string) bool {
for _, value := range slice {
if target == value {
return true
}
}
return false
}
func IsNonrancherContainer(instance model.Instance) bool {
return instance.NativeContainer
}
func AddToEnv(config *container.Config, result map[string]string, args ...string) {
envs := config.Env
existKeys := map[string]struct{}{}
for _, key := range envs {
parts := strings.Split(key, "=")
if len(parts) > 0 {
existKeys[parts[0]] = struct{}{}
}
}
for key, value := range result {
if _, ok := existKeys[key]; !ok {
envs = append(envs, fmt.Sprintf("%v=%v", key, value))
}
}
config.Env = envs
}
func HasKey(m interface{}, key string) bool {
_, ok := m.(map[string]interface{})[key]
return ok
}
func HasLabel(instance model.Instance) bool {
_, ok := instance.Labels[constants.CattelURLLabel]
return ok
}
func ReadBuffer(reader io.ReadCloser) string {
buffer := make([]byte, 1024)
s := ""
for {
n, err := reader.Read(buffer)
s = s + string(buffer[:n])
if err != nil {
break
}
}
return s
}
func GetFieldsIfExist(m map[string]interface{}, fields ...string) (interface{}, bool) {
var tempMap map[string]interface{}
tempMap = m
for i, field := range fields {
switch tempMap[field].(type) {
case map[string]interface{}:
tempMap = tempMap[field].(map[string]interface{})
break
case nil:
return nil, false
default:
// if it is the last field and it is not empty
// it exists othewise return false
if i == len(fields)-1 {
return tempMap[field], true
}
return nil, false
}
}
return tempMap, true
}
func TempFileInWorkDir(destination string) string {
dstPath := path.Join(destination, constants.TempName)
if _, err := os.Stat(dstPath); os.IsNotExist(err) {
os.MkdirAll(dstPath, 0777)
}
return TempFile(dstPath)
}
func TempFile(destination string) string {
tempDst, err := ioutil.TempFile(destination, constants.TempPrefix)
if err == nil {
return tempDst.Name()
}
return ""
}
func ConvertPortToString(port int) string {
if port == 0 {
return ""
}
return strconv.Itoa(port)
}
func InterfaceToString(v interface{}) string {
value, ok := v.(string)
if ok {
return value
}
return ""
}
func InterfaceToBool(v interface{}) bool {
value, ok := v.(bool)
if ok {
return value
}
return false
}
func InterfaceToArray(v interface{}) []interface{} {
value, ok := v.([]interface{})
if ok {
return value
}
return []interface{}{}
}
func InterfaceToMap(v interface{}) map[string]interface{} {
value, ok := v.(map[string]interface{})
if ok {
return value
}
return map[string]interface{}{}
}
func AddLinkEnv(name string, link model.Link, result map[string]string, inIP string) {
result[strings.ToUpper(fmt.Sprintf("%s_NAME", toEnvName(name)))] = fmt.Sprintf("/cattle/%s", name)
ports := link.Data.Fields.Ports
for _, port := range ports {
protocol := port.Protocol
ip := strings.ToLower(name)
if inIP != "" {
ip = inIP
}
dst := port.PrivatePort
src := port.PrivatePort
fullPort := fmt.Sprintf("%v://%v:%v", protocol, ip, dst)
data := make(map[string]string)
data["NAME"] = fmt.Sprintf("/cattle/%v", name)
data["PORT"] = fullPort
data[fmt.Sprintf("PORT_%v_%v", src, protocol)] = fullPort
data[fmt.Sprintf("PORT_%v_%v_ADDR", src, protocol)] = ip
data[fmt.Sprintf("PORT_%v_%v_PORT", src, protocol)] = getStringOrFloat(dst)
data[fmt.Sprintf("PORT_%v_%v_PROTO", src, protocol)] = protocol
for key, value := range data {
result[strings.ToUpper(fmt.Sprintf("%v_%v", toEnvName(name), key))] = value
}
}
}
func CopyLinkEnv(name string, link model.Link, result map[string]string) {
targetInstance := link.TargetInstance
envs := targetInstance.Data.DockerInspect.Config.Env
ignores := make(map[string]bool)
for _, env := range envs {
parts := strings.SplitN(env, "=", 2)
if len(parts) == 1 {
continue
}
if strings.HasPrefix(parts[1], "/cattle/") {
envName := toEnvName(parts[1][len("/cattle/"):])
ignores[envName+"_NAME"] = true
ignores[envName+"_PORT"] = true
ignores[envName+"_ENV"] = true
}
}
for _, env := range envs {
shouldIgnore := false
for ignore := range ignores {
if strings.HasPrefix(env, ignore) {
shouldIgnore = true
break
}
}
if shouldIgnore {
continue
}
parts := strings.SplitN(env, "=", 2)
if len(parts) == 1 {
continue
}
key, value := parts[0], parts[1]
if key == "HOME" || key == "PATH" {
continue
}
result[fmt.Sprintf("%s_ENV_%s", toEnvName(name), key)] = value
}
}
func toEnvName(name string) string {
r, _ := regexp.Compile("[^a-zA-Z0-9_]")
if r.FindStringSubmatch(name) != nil {
name = strings.Replace(name, r.FindStringSubmatch(name)[0], "_", -1)
}
return strings.ToUpper(name)
}
func ParseRepoTag(name string) string {
if strings.HasPrefix(name, "docker:") {
name = name[7:]
}
return name
}
func GetContainer(client *engineCli.Client, instance model.Instance, byAgent bool) (types.Container, error) {
containers, err := client.ContainerList(context.Background(), types.ContainerListOptions{All: true})
if err != nil {
return types.Container{}, errors.Wrap(err, constants.GetContainerError+"failed to list containers")
}
for _, container := range containers {
if uuid, ok := container.Labels[constants.UUIDLabel]; ok && uuid == instance.UUID {
return container, nil
}
}
if container, ok := FindFirst(containers, func(c types.Container) bool {
if GetUUID(c) == instance.UUID {
return true
}
return false
}); ok {
return container, nil
}
if externalID := instance.ExternalID; externalID != "" {
if container, ok := FindFirst(containers, func(c types.Container) bool {
return IDFilter(externalID, c)
}); ok {
return container, nil
}
}
if byAgent {
agentID := instance.AgentID
if container, ok := FindFirst(containers, func(c types.Container) bool {
return AgentIDFilter(strconv.Itoa(agentID), c)
}); ok {
return container, nil
}
}
return types.Container{}, model.ContainerNotFoundError{}
}
func GetUUID(container types.Container) string {
if uuid, ok := container.Labels[constants.UUIDLabel]; ok {
return uuid
}
names := container.Names
if len(names) == 0 {
return fmt.Sprintf("no-uuid-%s", container.ID)
}
if strings.HasPrefix(names[0], "/") {
return names[0][1:]
}
return names[0]
}
func FindFirst(containers []types.Container, f func(types.Container) bool) (types.Container, bool) {
for _, c := range containers {
if f(c) {
return c, true
}
}
return types.Container{}, false
}
func IDFilter(id string, container types.Container) bool {
return container.ID == id
}
func AgentIDFilter(id string, container types.Container) bool {
containerID, ok := container.Labels[constants.AgentIDLabel]
if ok {
return containerID == id
}
return false
}
func SemverTrunk(version string, vals int) string {
/*
vrm_vals: is a number representing the number of
digits to return. ex: 1.8.3
vmr_val = 1; return val 1
vmr_val = 2; return val 1.8
vmr_val = 3; return val 1.8.3
*/
if version != "" {
m := map[int]string{
1: regexp.MustCompile("(\\d+)").FindString(version),
2: regexp.MustCompile("(\\d+\\.)?(\\d+)").FindString(version),
3: regexp.MustCompile("(\\d+\\.)?(\\d+\\.)?(\\d+)").FindString(version),
}
return m[vals]
}
return version
}
func NameFilter(name string, container types.Container) bool {
names := container.Names
if names == nil || len(names) == 0 {
return false
}
found := false
for _, n := range names {
if strings.HasSuffix(n, name) {
found = true
break
}
}
return found
}
func RemoveContainer(client *engineCli.Client, containerID string) error {
client.ContainerKill(context.Background(), containerID, "KILL")
for i := 0; i < 10; i++ {
if inspect, err := client.ContainerInspect(context.Background(), containerID); err == nil && inspect.State.Pid == 0 {
break
}
time.Sleep(time.Duration(500) * time.Millisecond)
}
if err := client.ContainerRemove(context.Background(), containerID, types.ContainerRemoveOptions{}); !engineCli.IsErrContainerNotFound(err) {
return errors.Wrap(err, constants.RemoveContainerError+"failed to remove container")
}
return nil
}
func AddContainer(state string, container types.Container, containers []model.PingResource, dockerClient *engineCli.Client) []model.PingResource {
containerData := model.PingResource{
Type: "instance",
UUID: GetUUID(container),
State: state,
DockerID: container.ID,
Image: container.Image,
Labels: container.Labels,
Created: container.Created,
}
return append(containers, containerData)
}
func IsContainerNotFoundError(e error) bool {
_, ok := e.(model.ContainerNotFoundError)
return ok
}
func IsImageNoOp(image model.Image) bool {
return image.ProcessData.ContainerNoOpEvent
}
func GetProgress(request *revents.Event, cli *client.RancherClient) *progress.Progress {
progress := progress.Progress{
Request: request,
Client: cli,
}
return &progress
}
//weird method to convert an interface to string
func getStringOrFloat(v interface{}) string {
if f, ok := v.(float64); ok {
return strconv.FormatFloat(f, 'f', -1, 64)
}
return v.(string)
}
func GetExitCode(err error) int {
if exitError, ok := err.(*exec.ExitError); ok {
status := exitError.Sys().(syscall.WaitStatus)
return status.ExitStatus()
}
return -1
}
func IsNoopEvent(event *revents.Event) bool {
if noOp, ok := GetFieldsIfExist(event.Data, "processData", "containerNoOpEvent"); ok {
return InterfaceToBool(noOp)
}
return false
}