feat(images): gRPC client and server for ListImages

internal/machine/api/pb/docker.pb.go

@@ -1089,6 +1089,8 @@ type MachineImages struct {
 	DockerImages []byte `protobuf:"bytes,2,opt,name=docker_images,json=dockerImages,proto3" json:"docker_images,omitempty"`
 	// JSON serialised []image.Summary for images from containerd image store.
 	ContainerdImages []byte `protobuf:"bytes,3,opt,name=containerd_images,json=containerdImages,proto3" json:"containerd_images,omitempty"`
+	// True if Docker uses the containerd image store, false if it uses its internal image store.
+	DockerContainerdStore bool `protobuf:"varint,4,opt,name=docker_containerd_store,json=dockerContainerdStore,proto3" json:"docker_containerd_store,omitempty"`
 }
 
 func (x *MachineImages) Reset() {
@@ -1144,6 +1146,13 @@ func (x *MachineImages) GetContainerdImages() []byte {
 	return nil
 }
 
+func (x *MachineImages) GetDockerContainerdStore() bool {
+	if x != nil {
+		return x.DockerContainerdStore
+	}
+	return false
+}
+
 type CreateVolumeRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1824,7 +1833,7 @@ var file_internal_machine_api_pb_docker_proto_rawDesc = []byte{
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+	0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (

internal/machine/api/pb/docker.proto

@@ -152,6 +152,8 @@ message MachineImages {
   bytes docker_images = 2;
   // JSON serialised []image.Summary for images from containerd image store.
   bytes containerd_images = 3;
+  // True if Docker uses the containerd image store, false if it uses its internal image store.
+  bool docker_containerd_store = 4;
 }
 
 message CreateVolumeRequest {

internal/machine/docker/client.go

@@ -25,16 +25,18 @@ import (
 )
 
 // Client is a gRPC client for the Docker service that provides a similar interface to the Docker HTTP client.
+// TODO: it doesn't seem there is much value in having this intermediate Docker client.
+// Consider merging it into the main pkg/client.
 type Client struct {
 	conn       *grpc.ClientConn
-	grpcClient pb.DockerClient
+	GRPCClient pb.DockerClient
 }
 
 // NewClient creates a new Docker gRPC client with the provided gRPC connection.
 func NewClient(conn *grpc.ClientConn) *Client {
 	return &Client{
 		conn:       conn,
-		grpcClient: pb.NewDockerClient(conn),
+		GRPCClient: pb.NewDockerClient(conn),
 	}
 }
 
@@ -71,7 +73,7 @@ func (c *Client) CreateContainer(
 		return resp, fmt.Errorf("marshal platform: %w", err)
 	}
 
-	grpcResp, err := c.grpcClient.CreateContainer(ctx, &pb.CreateContainerRequest{
+	grpcResp, err := c.GRPCClient.CreateContainer(ctx, &pb.CreateContainerRequest{
 		Config:        configBytes,
 		HostConfig:    hostConfigBytes,
 		NetworkConfig: networkingConfigBytes,
@@ -95,7 +97,7 @@ func (c *Client) CreateContainer(
 func (c *Client) InspectContainer(ctx context.Context, id string) (types.ContainerJSON, error) {
 	var resp types.ContainerJSON
 
-	grpcResp, err := c.grpcClient.InspectContainer(ctx, &pb.InspectContainerRequest{Id: id})
+	grpcResp, err := c.GRPCClient.InspectContainer(ctx, &pb.InspectContainerRequest{Id: id})
 	if err != nil {
 		if status.Convert(err).Code() == codes.NotFound {
 			return resp, errdefs.NotFound(err)
@@ -116,7 +118,7 @@ func (c *Client) StartContainer(ctx context.Context, id string, opts container.S
 		return fmt.Errorf("marshal options: %w", err)
 	}
 
-	_, err = c.grpcClient.StartContainer(ctx, &pb.StartContainerRequest{
+	_, err = c.GRPCClient.StartContainer(ctx, &pb.StartContainerRequest{
 		Id:      id,
 		Options: optsBytes,
 	})
@@ -135,7 +137,7 @@ func (c *Client) StopContainer(ctx context.Context, id string, opts container.St
 		return fmt.Errorf("marshal options: %w", err)
 	}
 
-	_, err = c.grpcClient.StopContainer(ctx, &pb.StopContainerRequest{
+	_, err = c.GRPCClient.StopContainer(ctx, &pb.StopContainerRequest{
 		Id:      id,
 		Options: optsBytes,
 	})
@@ -158,7 +160,7 @@ func (c *Client) ListContainers(ctx context.Context, opts container.ListOptions)
 		return nil, fmt.Errorf("marshal options: %w", err)
 	}
 
-	resp, err := c.grpcClient.ListContainers(ctx, &pb.ListContainersRequest{Options: optsBytes})
+	resp, err := c.GRPCClient.ListContainers(ctx, &pb.ListContainersRequest{Options: optsBytes})
 	if err != nil {
 		return nil, err
 	}
@@ -185,7 +187,7 @@ func (c *Client) RemoveContainer(ctx context.Context, id string, opts container.
 		return fmt.Errorf("marshal options: %w", err)
 	}
 
-	_, err = c.grpcClient.RemoveContainer(ctx, &pb.RemoveContainerRequest{
+	_, err = c.GRPCClient.RemoveContainer(ctx, &pb.RemoveContainerRequest{
 		Id:      id,
 		Options: optsBytes,
 	})
@@ -212,7 +214,7 @@ func (c *Client) PullImage(ctx context.Context, image string, opts PullOptions)
 		return nil, fmt.Errorf("marshal options: %w", err)
 	}
 
-	stream, err := c.grpcClient.PullImage(ctx, &pb.PullImageRequest{Image: image, Options: optsBytes})
+	stream, err := c.GRPCClient.PullImage(ctx, &pb.PullImageRequest{Image: image, Options: optsBytes})
 	if err != nil {
 		return nil, err
 	}
@@ -246,7 +248,7 @@ func (c *Client) PullImage(ctx context.Context, image string, opts PullOptions)
 
 // InspectImage returns the image information for the given image ID. The request may be sent to multiple machines.
 func (c *Client) InspectImage(ctx context.Context, id string) ([]api.MachineImage, error) {
-	resp, err := c.grpcClient.InspectImage(ctx, &pb.InspectImageRequest{Id: id})
+	resp, err := c.GRPCClient.InspectImage(ctx, &pb.InspectImageRequest{Id: id})
 	if err != nil {
 		// If the request was sent to only one machine, err is an actual error from the machine.
 		if status.Convert(err).Code() == codes.NotFound {
@@ -284,7 +286,7 @@ func (c *Client) InspectImage(ctx context.Context, id string) ([]api.MachineImag
 // credentials if necessary. If the response from a machine doesn't contain an error, the api.RemoteImage will either
 // contain an IndexManifest or an ImageManifest.
 func (c *Client) InspectRemoteImage(ctx context.Context, id string) ([]api.MachineRemoteImage, error) {
-	resp, err := c.grpcClient.InspectRemoteImage(ctx, &pb.InspectRemoteImageRequest{Id: id})
+	resp, err := c.GRPCClient.InspectRemoteImage(ctx, &pb.InspectRemoteImageRequest{Id: id})
 	if err != nil {
 		return nil, err
 	}
@@ -361,7 +363,7 @@ func (c *Client) CreateVolume(ctx context.Context, opts volume.CreateOptions) (v
 		return vol, fmt.Errorf("marshal options: %w", err)
 	}
 
-	resp, err := c.grpcClient.CreateVolume(ctx, &pb.CreateVolumeRequest{Options: optsBytes})
+	resp, err := c.GRPCClient.CreateVolume(ctx, &pb.CreateVolumeRequest{Options: optsBytes})
 	if err != nil {
 		return vol, err
 	}
@@ -373,20 +375,18 @@ func (c *Client) CreateVolume(ctx context.Context, opts volume.CreateOptions) (v
 	return vol, nil
 }
 
-// MachineVolumes represents a volume list response from a machine.
 type MachineVolumes struct {
 	Metadata *pb.Metadata
 	Response volume.ListResponse
 }
 
-// ListVolumes returns a list of all volumes matching the filter.
 func (c *Client) ListVolumes(ctx context.Context, opts volume.ListOptions) ([]MachineVolumes, error) {
 	optsBytes, err := json.Marshal(opts)
 	if err != nil {
 		return nil, fmt.Errorf("marshal options: %w", err)
 	}
 
-	resp, err := c.grpcClient.ListVolumes(ctx, &pb.ListVolumesRequest{Options: optsBytes})
+	resp, err := c.GRPCClient.ListVolumes(ctx, &pb.ListVolumesRequest{Options: optsBytes})
 	if err != nil {
 		return nil, err
 	}
@@ -408,7 +408,7 @@ func (c *Client) ListVolumes(ctx context.Context, opts volume.ListOptions) ([]Ma
 
 // RemoveVolume removes a volume with the given ID.
 func (c *Client) RemoveVolume(ctx context.Context, id string, force bool) error {
-	_, err := c.grpcClient.RemoveVolume(ctx, &pb.RemoveVolumeRequest{
+	_, err := c.GRPCClient.RemoveVolume(ctx, &pb.RemoveVolumeRequest{
 		Id:    id,
 		Force: force,
 	})
@@ -431,7 +431,7 @@ func (c *Client) CreateServiceContainer(
 	if err != nil {
 		return resp, fmt.Errorf("marshal service spec: %w", err)
 	}
-	grpcResp, err := c.grpcClient.CreateServiceContainer(ctx, &pb.CreateServiceContainerRequest{
+	grpcResp, err := c.GRPCClient.CreateServiceContainer(ctx, &pb.CreateServiceContainerRequest{
 		ServiceId:     serviceID,
 		ServiceSpec:   specBytes,
 		ContainerName: containerName,
@@ -454,7 +454,7 @@ func (c *Client) CreateServiceContainer(
 func (c *Client) InspectServiceContainer(ctx context.Context, id string) (api.ServiceContainer, error) {
 	var resp api.ServiceContainer
 
-	grpcResp, err := c.grpcClient.InspectServiceContainer(ctx, &pb.InspectContainerRequest{Id: id})
+	grpcResp, err := c.GRPCClient.InspectServiceContainer(ctx, &pb.InspectContainerRequest{Id: id})
 	if err != nil {
 		if status.Convert(err).Code() == codes.NotFound {
 			return resp, errdefs.NotFound(err)
@@ -487,7 +487,7 @@ func (c *Client) ListServiceContainers(
 		return nil, fmt.Errorf("marshal options: %w", err)
 	}
 
-	resp, err := c.grpcClient.ListServiceContainers(ctx, &pb.ListServiceContainersRequest{
+	resp, err := c.GRPCClient.ListServiceContainers(ctx, &pb.ListServiceContainersRequest{
 		ServiceId: serviceNameOrID,
 		Options:   optsBytes,
 	})
@@ -526,7 +526,7 @@ func (c *Client) RemoveServiceContainer(ctx context.Context, id string, opts con
 		return fmt.Errorf("marshal options: %w", err)
 	}
 
-	_, err = c.grpcClient.RemoveServiceContainer(ctx, &pb.RemoveContainerRequest{
+	_, err = c.GRPCClient.RemoveServiceContainer(ctx, &pb.RemoveContainerRequest{
 		Id:      id,
 		Options: optsBytes,
 	})

internal/machine/docker/server.go

@@ -36,10 +36,12 @@ import (
 	"github.com/jmoiron/sqlx"
 	"github.com/opencontainers/go-digest"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
+	"github.com/psviderski/uncloud/internal/containerd"
 	"github.com/psviderski/uncloud/internal/machine/api/pb"
 	"github.com/psviderski/uncloud/internal/machine/dns"
 	"github.com/psviderski/uncloud/internal/secret"
 	"github.com/psviderski/uncloud/pkg/api"
+	"github.com/stretchr/testify/require"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
@@ -447,6 +449,53 @@ func (s *Server) ListVolumes(ctx context.Context, req *pb.ListVolumesRequest) (*
 	}, nil
 }
 
+// ListImages lists images present in the Docker and containerd image stores.
+func (s *Server) ListImages(ctx context.Context, req *pb.ListImagesRequest) (*pb.ListImagesResponse, error) {
+	var opts image.ListOptions
+	if len(req.Options) > 0 {
+		if err := json.Unmarshal(req.Options, &opts); err != nil {
+			return nil, status.Errorf(codes.InvalidArgument, "unmarshal options: %v", err)
+		}
+
+		// Handle filters separately because they implement custom JSON unmarshalling.
+		var raw map[string]json.RawMessage
+		if err := json.Unmarshal(req.Options, &raw); err != nil {
+			return nil, status.Errorf(codes.InvalidArgument, "unmarshal options to raw map: %v", err)
+		}
+
+		if filtersBytes, ok := raw["Filters"]; ok {
+			args, err := filters.FromJSON(string(filtersBytes))
+			if err != nil {
+				return nil, status.Errorf(codes.InvalidArgument, "unmarshal filters: %v", err)
+			}
+			opts.Filters = args
+		}
+	}
+
+	images, err := s.service.ListImages(ctx, opts)
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, err.Error())
+	}
+
+	machineImages := pb.MachineImages{
+		DockerContainerdStore: images.DockerContainerdStore,
+	}
+	if len(images.DockerImages) > 0 {
+		if machineImages.DockerImages, err = json.Marshal(images.DockerImages); err != nil {
+			return nil, status.Errorf(codes.Internal, "marshal Docker images: %v", err)
+		}
+	}
+	if len(images.ContainerdImages) > 0 {
+		if machineImages.ContainerdImages, err = json.Marshal(images.ContainerdImages); err != nil {
+			return nil, status.Errorf(codes.Internal, "marshal containerd images: %v", err)
+		}
+	}
+
+	return &pb.ListImagesResponse{
+		Messages: []*pb.MachineImages{&machineImages},
+	}, nil
+}
+
 // RemoveVolume removes a volume with the given ID.
 func (s *Server) RemoveVolume(ctx context.Context, req *pb.RemoveVolumeRequest) (*emptypb.Empty, error) {
 	if err := s.client.VolumeRemove(ctx, req.Id, req.Force); err != nil {

internal/machine/docker/service.go

@@ -7,13 +7,18 @@ import (
 	"errors"
 	"fmt"
 	"log/slog"
+	"strings"
 
 	"github.com/docker/docker/api/types/container"
 	"github.com/docker/docker/api/types/filters"
+	"github.com/docker/docker/api/types/image"
 	"github.com/docker/docker/client"
 	"github.com/jmoiron/sqlx"
 	"github.com/psviderski/uncloud/internal/containerd"
+	"github.com/psviderski/uncloud/internal/machine/api/pb"
 	"github.com/psviderski/uncloud/pkg/api"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 )
 
 // Service provides higher-level Docker operations that extends Docker API with Uncloud-specific data
@@ -107,3 +112,60 @@ func (s *Service) ListServiceContainers(
 
 	return containers, nil
 }
+
+// IsContainerdImageStoreEnabled checks if Docker is configured to use the containerd image store:
+// https://docs.docker.com/engine/storage/containerd/
+func (s *Service) IsContainerdImageStoreEnabled(ctx context.Context) (bool, error) {
+	info, err := s.Client.Info(ctx)
+	if err != nil {
+		return false, fmt.Errorf("get Docker info: %w", err)
+	}
+
+	return strings.Contains(fmt.Sprintf("%s", info.DriverStatus), "containerd.snapshotter"), nil
+}
+
+type Images struct {
+	// DockerImages lists images from the Docker internal image store.
+	// It may be empty if Docker uses the containerd image store.
+	DockerImages []image.Summary
+	// ContainerdImages lists images from the containerd image store.
+	ContainerdImages []image.Summary
+	// DockerContainerdStore indicates whether Docker is using the containerd image store.
+	DockerContainerdStore bool
+}
+
+// ListImages lists images present in the Docker and containerd image stores.
+// If Docker uses the containerd image store, only images from containerd are listed, as the internal Docker image
+// store is not accessible in this case. Otherwise, images from both stores are listed.
+func (s *Service) ListImages(ctx context.Context, opts image.ListOptions) (Images, error) {
+	var images Images
+
+	// Always include the image manifests in the response.
+	opts.Manifests = true
+	// List images from Docker.
+	dockerImages, err := s.Client.ImageList(ctx, opts)
+	if err != nil {
+		return images, status.Errorf(codes.Internal, "list Docker images: %v", err)
+	}
+
+	isContainerdStore, err := s.IsContainerdImageStoreEnabled(ctx)
+	if err != nil {
+		return images, status.Errorf(codes.Internal, "check if Docker uses containerd image store: %v", err)
+	}
+
+	if isContainerdStore {
+		// Docker uses the containerd image store, hence the images listed from Docker are just references to images
+		// in containerd. The internal Docker image store is not accessible in this case.
+		images = Images{
+			ContainerdImages:      dockerImages,
+			DockerContainerdStore: true,
+		}
+	} else {
+		images = Images{
+			DockerImages: dockerImages,
+			// TODO: List images from containerd directly. ContainerdImages: containerdImages,
+		}
+	}
+
+	return images, nil
+}

pkg/api/image.go

@@ -3,6 +3,7 @@ package api
 import (
 	"github.com/distribution/reference"
 	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/image"
 	v1 "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/psviderski/uncloud/internal/machine/api/pb"
 )
@@ -12,6 +13,23 @@ type MachineImage struct {
 	Image    types.ImageInspect
 }
 
+// MachineImages represents images present on a particular machine.
+type MachineImages struct {
+	Metadata *pb.Metadata
+	// DockerImages is a list of images present in the Docker internal image store.
+	// It may be empty if Docker uses the containerd image store directly (containerd-snapshotter feature).
+	DockerImages []image.Summary
+	// ContainerdImages is a list of images present in the containerd image store.
+	ContainerdImages []image.Summary
+}
+
+// ImageFilter defines criteria to filter images in ListImages.
+type ImageFilter struct {
+	// Machines filters images to those present on the specified machines (names or IDs).
+	// If empty, it matches images on all machines.
+	Machines []string
+}
+
 // MachineRemoteImage represents an image in a remote registry fetched by a particular machine.
 type MachineRemoteImage struct {
 	Metadata *pb.Metadata

pkg/client/image.go

@@ -2,6 +2,7 @@ package client
 
 import (
 	"context"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"net"
@@ -41,6 +42,55 @@ func (cli *Client) InspectRemoteImage(ctx context.Context, id string) ([]api.Mac
 	return cli.Docker.InspectRemoteImage(ctx, id)
 }
 
+// ListImages returns a list of images in Docker and containerd on specified machines in the cluster.
+func (cli *Client) ListImages(ctx context.Context, filter api.ImageFilter) ([]api.MachineImages, error) {
+	// Broadcast the image list request to the specified machines or all machines if none specified.
+	listCtx, machines, err := api.ProxyMachinesContext(ctx, cli, filter.Machines)
+	if err != nil {
+		return nil, fmt.Errorf("create request context to broadcast to machines: %w", err)
+	}
+
+	opts := image.ListOptions{Manifests: true}
+	optsBytes, err := json.Marshal(opts)
+	if err != nil {
+		return nil, fmt.Errorf("marshal options: %w", err)
+	}
+
+	resp, err := cli.Docker.GRPCClient.ListImages(listCtx, &pb.ListImagesRequest{Options: optsBytes})
+	if err != nil {
+		return nil, err
+	}
+
+	machineImages := make([]api.MachineImages, len(resp.Messages))
+	for i, msg := range resp.Messages {
+		machineImages[i].Metadata = msg.Metadata
+		if msg.Metadata != nil {
+			// Replace management IP with machine ID for friendlier error messages.
+			// TODO: migrate Metadata.Machine to use machine ID instead of IP in the grpc-proxy router.
+			if m := machines.FindByManagementIP(msg.Metadata.Machine); m != nil {
+				machineImages[i].Metadata.Machine = m.Machine.Id
+			}
+			if msg.Metadata.Error != "" {
+				continue
+			}
+		}
+
+		if len(msg.DockerImages) > 0 {
+			if err = json.Unmarshal(msg.DockerImages, &machineImages[i].DockerImages); err != nil {
+				return nil, fmt.Errorf("unmarshal Docker images: %w", err)
+			}
+		}
+
+		if len(msg.ContainerdImages) > 0 {
+			if err = json.Unmarshal(msg.ContainerdImages, &machineImages[i].ContainerdImages); err != nil {
+				return nil, fmt.Errorf("unmarshal containerd images: %w", err)
+			}
+		}
+	}
+
+	return machineImages, nil
+}
+
 type PushImageOptions struct {
 	// Machines is a list of machine names or IDs to push the image to. If empty and AllMachines is false,
 	// pushes to the machine the client is connected to.