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docker.go
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docker.go
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package rkeworker
import (
"context"
"reflect"
"strings"
"time"
"github.com/docker/docker/api/types"
"github.com/docker/docker/client"
"github.com/docker/go-connections/nat"
v3 "github.com/rancher/types/apis/management.cattle.io/v3"
"github.com/sirupsen/logrus"
)
const (
RKEContainerNameLabel = "io.rancher.rke.container.name"
CattleProcessNameLabel = "io.cattle.process.name"
)
type NodeConfig struct {
ClusterName string `json:"clusterName"`
Certs string `json:"certs"`
Processes map[string]v3.Process `json:"processes"`
Files []v3.File `json:"files"`
}
func remove(ctx context.Context, c *client.Client, id string) error {
return c.ContainerRemove(ctx, id, types.ContainerRemoveOptions{
Force: true,
RemoveVolumes: true,
})
}
func restart(ctx context.Context, c *client.Client, id string) error {
timeoutDuration := 10 * time.Second
return c.ContainerRestart(ctx, id, &timeoutDuration)
}
func changed(ctx context.Context, c *client.Client, expectedProcess v3.Process, container types.Container) (bool, error) {
actualDockerInspect, err := c.ContainerInspect(ctx, container.ID)
if err != nil {
return false, err
}
defaultDockerInspect, _, err := c.ImageInspectWithRaw(ctx, actualDockerInspect.Image)
if err != nil {
return false, err
}
actualProcess := v3.Process{
Command: actualDockerInspect.Config.Entrypoint,
Args: actualDockerInspect.Config.Cmd,
Env: actualDockerInspect.Config.Env,
Image: actualDockerInspect.Config.Image,
Binds: actualDockerInspect.HostConfig.Binds,
NetworkMode: string(actualDockerInspect.HostConfig.NetworkMode),
PidMode: string(actualDockerInspect.HostConfig.PidMode),
Privileged: actualDockerInspect.HostConfig.Privileged,
VolumesFrom: actualDockerInspect.HostConfig.VolumesFrom,
Labels: actualDockerInspect.Config.Labels,
}
if len(expectedProcess.Command) == 0 {
expectedProcess.Command = actualProcess.Command
}
if len(expectedProcess.Args) == 0 {
expectedProcess.Args = actualProcess.Args
}
if len(expectedProcess.Env) == 0 {
expectedProcess.Env = actualProcess.Env
}
if expectedProcess.NetworkMode == "" {
expectedProcess.NetworkMode = actualProcess.NetworkMode
}
if expectedProcess.PidMode == "" {
expectedProcess.PidMode = actualProcess.PidMode
}
if len(expectedProcess.Labels) == 0 {
expectedProcess.Labels = actualProcess.Labels
}
// Don't detect changes on these fields
actualProcess.Name = expectedProcess.Name
actualProcess.HealthCheck.URL = expectedProcess.HealthCheck.URL
actualProcess.RestartPolicy = expectedProcess.RestartPolicy
actualProcess.ImageRegistryAuthConfig = expectedProcess.ImageRegistryAuthConfig
changed := false
t := reflect.TypeOf(actualProcess)
for i := 0; i < t.NumField(); i++ {
f := t.Field(i)
if f.Name == "Command" {
leftMap := sliceToMap(expectedProcess.Command)
rightMap := sliceToMap(actualProcess.Command)
if reflect.DeepEqual(leftMap, rightMap) {
continue
}
} else if f.Name == "Env" {
expectedEnvs := make(map[string]string, 8)
for _, env := range defaultDockerInspect.Config.Env {
es := strings.SplitN(env, "=", 2)
if len(es) == 2 {
expectedEnvs[es[0]] = es[1]
}
}
for _, env := range expectedProcess.Env {
es := strings.SplitN(env, "=", 2)
if len(es) == 2 {
expectedEnvs[es[0]] = es[1]
} else {
expectedEnvs[es[0]] = "_host_related_env_"
}
}
actualEnvs := make(map[string]string, 8)
for _, env := range actualProcess.Env {
es := strings.SplitN(env, "=", 2)
if len(es) == 2 {
actualEnvs[es[0]] = es[1]
}
}
isNothingChange := true
for expectedEnvName, expectedEnvVal := range expectedEnvs {
if expectedEnvVal == "_host_related_env_" {
continue
}
if expectedEnvVal != actualEnvs[expectedEnvName] {
isNothingChange = false
break
}
}
if isNothingChange {
continue
}
} else if f.Name == "Labels" {
processLabels := make(map[string]string)
for k, v := range defaultDockerInspect.Config.Labels {
processLabels[k] = v
}
for k, v := range expectedProcess.Labels {
processLabels[k] = v
}
if reflect.DeepEqual(processLabels, actualProcess.Labels) {
continue
}
} else if f.Name == "Publish" {
expectedExposedPortSet, expectedBindings, err := nat.ParsePortSpecs(reflect.ValueOf(expectedProcess).Field(i).Interface().([]string))
if err != nil {
return false, err
}
expectedExposedPorts := natPortSetToSlice(expectedExposedPortSet)
nat.SortPortMap(expectedExposedPorts, expectedBindings)
actualExposedPortSet := make(map[nat.Port]struct{}, 0)
actualBindings := actualDockerInspect.HostConfig.PortBindings
for port := range actualBindings {
if _, exists := actualExposedPortSet[port]; !exists {
actualExposedPortSet[port] = struct{}{}
}
}
actualExposedPorts := natPortSetToSlice(actualExposedPortSet)
nat.SortPortMap(actualExposedPorts, actualBindings)
if reflect.DeepEqual(actualBindings, nat.PortMap(expectedBindings)) {
continue
}
}
left := reflect.ValueOf(actualProcess).Field(i).Interface()
right := reflect.ValueOf(expectedProcess).Field(i).Interface()
if !reflect.DeepEqual(left, right) {
logrus.Infof("For process %s, %s has changed from %v to %v", expectedProcess.Name, f.Name, right, left)
changed = true
}
}
return changed, nil
}
func sliceToMap(args []string) map[string]bool {
result := map[string]bool{}
for _, arg := range args {
result[arg] = true
}
return result
}
func natPortSetToSlice(args map[nat.Port]struct{}) []nat.Port {
result := make([]nat.Port, 0, len(args))
for arg := range args {
result = append(result, arg)
}
return result
}