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docker.go
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docker.go
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package rkeworker
import (
"context"
"reflect"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/filters"
"github.com/docker/docker/client"
"github.com/rancher/rke/services"
"github.com/rancher/types/apis/management.cattle.io/v3"
"github.com/sirupsen/logrus"
)
type NodeConfig struct {
APIProxyAddress string `json:"apiProxyAddress"`
Certs string `json:"certs"`
Processes map[string]v3.Process `json:"processes"`
}
func runProcess(ctx context.Context, name string, p v3.Process) error {
c, err := client.NewEnvClient()
if err != nil {
return err
}
args := filters.NewArgs()
args.Add("label", "io.cattle.process.name="+name)
containers, err := c.ContainerList(ctx, types.ContainerListOptions{
All: true,
Filters: args,
})
if err != nil {
return err
}
var matchedContainers []types.Container
for _, container := range containers {
changed, err := changed(ctx, c, p, container)
if err != nil {
return err
}
if changed {
err := remove(ctx, c, container.ID)
if err != nil {
return err
}
} else {
matchedContainers = append(matchedContainers, container)
}
}
for i := 1; i < len(matchedContainers); i++ {
if err := remove(ctx, c, matchedContainers[i].ID); err != nil {
return err
}
}
if len(matchedContainers) > 0 {
c.ContainerStart(ctx, matchedContainers[0].ID, types.ContainerStartOptions{})
return nil
}
config, hostConfig, _ := services.GetProcessConfig(p)
if config.Labels == nil {
config.Labels = map[string]string{}
}
config.Labels["io.cattle.process.name"] = name
hostConfig.VolumesFrom = nil
newContainer, err := c.ContainerCreate(ctx, config, hostConfig, nil, name)
if err == nil {
return c.ContainerStart(ctx, newContainer.ID, types.ContainerStartOptions{})
}
return err
}
func remove(ctx context.Context, c *client.Client, id string) error {
return c.ContainerRemove(ctx, id, types.ContainerRemoveOptions{
Force: true,
RemoveVolumes: true,
})
}
func changed(ctx context.Context, c *client.Client, p v3.Process, container types.Container) (bool, error) {
inspect, err := c.ContainerInspect(ctx, container.ID)
if err != nil {
return false, err
}
newProcess := v3.Process{
Command: inspect.Config.Entrypoint,
Args: inspect.Config.Cmd,
Env: inspect.Config.Env,
Image: inspect.Config.Image,
Binds: inspect.HostConfig.Binds,
NetworkMode: string(inspect.HostConfig.NetworkMode),
PidMode: string(inspect.HostConfig.PidMode),
Privileged: inspect.HostConfig.Privileged,
}
if len(p.Command) == 0 {
p.Command = newProcess.Command
}
if len(p.Args) == 0 {
p.Args = newProcess.Args
}
if len(p.Env) == 0 {
p.Env = newProcess.Env
}
if p.NetworkMode == "" {
p.NetworkMode = newProcess.NetworkMode
}
if p.PidMode == "" {
p.PidMode = newProcess.PidMode
}
// Don't detect changes on these fields
newProcess.Name = p.Name
newProcess.HealthCheck.URL = p.HealthCheck.URL
newProcess.RestartPolicy = p.RestartPolicy
newProcess.VolumesFrom = p.VolumesFrom
changed := false
t := reflect.TypeOf(newProcess)
for i := 0; i < t.NumField(); i++ {
f := t.Field(i)
left := reflect.ValueOf(newProcess).Field(i).Interface()
right := reflect.ValueOf(p).Field(i).Interface()
if !reflect.DeepEqual(left, right) {
logrus.Infof("For process %s, %s has changed from %v to %v", p.Name, f.Name, right, left)
changed = true
}
}
return changed, nil
}