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persistent.go
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persistent.go
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// Copyright 2022 Namespace Labs 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.
package install
import (
"context"
"fmt"
"io"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/api/types/network"
"github.com/docker/docker/client"
"github.com/docker/go-connections/nat"
"github.com/google/go-containerregistry/pkg/name"
"namespacelabs.dev/foundation/internal/artifacts/oci"
"namespacelabs.dev/foundation/internal/compute"
"namespacelabs.dev/foundation/internal/console"
"namespacelabs.dev/foundation/internal/runtime/docker"
"namespacelabs.dev/foundation/std/tasks"
)
type PersistentSpec struct {
Name string
ContainerName string
Version string
Image string
WaitUntilRunning func(context.Context, string) error
Volumes map[string]string
Ports map[int]int
Privileged bool
UseHostNetworking bool
}
type PersistentInformation struct {
Installed bool
Running bool
Version string
HaveHostNetwork bool
}
func (p PersistentSpec) Ensure(ctx context.Context, progress io.Writer) error {
return tasks.Action(p.Name+".check").Arg("version", p.Version).Run(ctx, func(ctx context.Context) error {
cli, err := docker.NewClient()
if err != nil {
return err
}
defer cli.Close()
info, err := p.running(ctx, cli)
if err != nil {
return err
}
if info.Version != p.Version || info.HaveHostNetwork != p.UseHostNetworking {
if err := p.remove(ctx, cli); err != nil {
return err
}
if err := p.install(ctx, cli, progress); err != nil {
return err
}
}
if !info.Running {
return p.start(ctx, cli)
}
return nil
})
}
func (p PersistentSpec) start(ctx context.Context, cli docker.Client) error {
fmt.Fprintf(console.Debug(ctx), "Starting %s version %s\n", p.Name, p.Version)
if err := cli.ContainerStart(ctx, p.ContainerName, types.ContainerStartOptions{}); err != nil {
return err
}
if p.WaitUntilRunning == nil {
return nil
}
return p.WaitUntilRunning(ctx, p.ContainerName)
}
func (p PersistentSpec) install(ctx context.Context, cli docker.Client, progress io.Writer) error {
var imageID oci.ImageID
imageID.Repository = p.Image
imageID.Tag = p.Version
image, err := compute.GetValue(ctx, oci.ResolveImage(imageID.ImageRef(), docker.HostPlatform()).Image())
if err != nil {
return err
}
tag, err := name.NewTag(imageID.ImageRef())
if err != nil {
return err
}
if err := docker.WriteImage(ctx, image, tag, true); err != nil {
return err
}
config := &container.Config{
Image: imageID.ImageRef(),
Volumes: map[string]struct{}{},
}
host := &container.HostConfig{
RestartPolicy: container.RestartPolicy{Name: "always"},
Privileged: p.Privileged,
}
host.PortBindings = map[nat.Port][]nat.PortBinding{}
for hostPort, containerPort := range p.Ports {
parsed, err := nat.ParsePortSpec(fmt.Sprintf("127.0.0.1:%d:%d", hostPort, containerPort))
if err != nil {
return err
}
for _, p := range parsed {
host.PortBindings[p.Port] = append(host.PortBindings[p.Port], p.Binding)
}
}
for name, target := range p.Volumes {
host.Binds = append(host.Binds, fmt.Sprintf("%s:%s", name, target))
}
if p.UseHostNetworking {
host.NetworkMode = container.NetworkMode("host")
}
created, err := tasks.Return(ctx, tasks.Action("docker.container.create").Arg("name", p.ContainerName), func(ctx context.Context) (container.ContainerCreateCreatedBody, error) {
return cli.ContainerCreate(ctx, config, host, &network.NetworkingConfig{}, nil, p.ContainerName)
})
if err != nil {
return err
}
if err := tasks.Action("docker.container.start").Arg("name", p.ContainerName).Arg("id", created.ID).Run(ctx, func(ctx context.Context) error {
return cli.ContainerStart(ctx, created.ID, types.ContainerStartOptions{})
}); err != nil {
return err
}
if p.WaitUntilRunning == nil {
return nil
}
return p.WaitUntilRunning(ctx, p.ContainerName)
}
func (p PersistentSpec) remove(ctx context.Context, cli docker.Client) error {
err := cli.ContainerRemove(ctx, p.ContainerName, types.ContainerRemoveOptions{RemoveVolumes: true, Force: true})
if client.IsErrNotFound(err) {
return nil
}
return err
}
func (p PersistentSpec) running(ctx context.Context, cli docker.Client) (*PersistentInformation, error) {
res, err := cli.ContainerInspect(ctx, p.ContainerName)
if err != nil {
if client.IsErrNotFound(err) {
return &PersistentInformation{Installed: false}, nil
}
return nil, err
}
var info PersistentInformation
if _, ok := res.NetworkSettings.Networks["host"]; ok {
info.HaveHostNetwork = true
}
info.Installed = true
info.Running = res.State.Running
n, err := name.ParseReference(res.Config.Image)
if err != nil {
return nil, err
}
if tag, ok := n.(name.Tag); ok {
info.Version = tag.TagStr()
}
return &info, nil
}