mirror of
https://github.com/psviderski/uncloud.git
synced 2026-08-26 11:03:34 +00:00
429 lines
14 KiB
Go
429 lines
14 KiB
Go
package docker
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"github.com/distribution/reference"
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"github.com/docker/docker/api/types"
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"github.com/docker/docker/api/types/container"
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"github.com/docker/docker/api/types/filters"
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"github.com/docker/docker/api/types/image"
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"github.com/docker/docker/api/types/network"
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"github.com/docker/docker/client"
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"github.com/docker/go-connections/nat"
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"github.com/google/go-containerregistry/pkg/authn"
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"github.com/google/go-containerregistry/pkg/name"
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"github.com/google/go-containerregistry/pkg/v1/remote"
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"github.com/opencontainers/go-digest"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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"github.com/psviderski/uncloud/internal/machine/api/pb"
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"github.com/psviderski/uncloud/internal/secret"
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"github.com/psviderski/uncloud/pkg/api"
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"google.golang.org/grpc"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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"google.golang.org/protobuf/types/known/emptypb"
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"io"
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"strconv"
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"strings"
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)
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// Server implements the gRPC Docker service that proxies requests to the Docker daemon.
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type Server struct {
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pb.UnimplementedDockerServer
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client *client.Client
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}
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// NewServer creates a new Docker gRPC server with the provided Docker client.
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func NewServer(cli *client.Client) *Server {
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return &Server{client: cli}
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}
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// CreateContainer creates a new container based on the given configuration.
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func (s *Server) CreateContainer(ctx context.Context, req *pb.CreateContainerRequest) (*pb.CreateContainerResponse, error) {
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var config container.Config
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var hostConfig container.HostConfig
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var networkConfig network.NetworkingConfig
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var platform ocispec.Platform
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// Unmarshal configurations from the request.
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if err := json.Unmarshal(req.Config, &config); err != nil {
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return nil, status.Errorf(codes.InvalidArgument, "unmarshal container config: %v", err)
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}
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if err := json.Unmarshal(req.HostConfig, &hostConfig); err != nil {
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return nil, status.Errorf(codes.InvalidArgument, "unmarshal host config: %v", err)
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}
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if err := json.Unmarshal(req.NetworkConfig, &networkConfig); err != nil {
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return nil, status.Errorf(codes.InvalidArgument, "unmarshal network config: %v", err)
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}
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if err := json.Unmarshal(req.Platform, &platform); err != nil {
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return nil, status.Errorf(codes.InvalidArgument, "unmarshal platform: %v", err)
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}
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resp, err := s.client.ContainerCreate(ctx, &config, &hostConfig, &networkConfig, &platform, req.Name)
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if err != nil {
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if client.IsErrNotFound(err) {
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return nil, status.Errorf(codes.NotFound, err.Error())
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}
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return nil, status.Errorf(codes.Internal, err.Error())
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}
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respBytes, err := json.Marshal(resp)
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if err != nil {
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return nil, status.Errorf(codes.Internal, "marshal response: %v", err)
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}
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return &pb.CreateContainerResponse{Response: respBytes}, nil
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}
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// InspectContainer returns the container information for the given container ID.
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func (s *Server) InspectContainer(ctx context.Context, req *pb.InspectContainerRequest) (*pb.InspectContainerResponse, error) {
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resp, err := s.client.ContainerInspect(ctx, req.Id)
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if err != nil {
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if client.IsErrNotFound(err) {
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return nil, status.Errorf(codes.NotFound, err.Error())
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}
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return nil, status.Errorf(codes.Internal, err.Error())
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}
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respBytes, err := json.Marshal(resp)
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if err != nil {
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return nil, status.Errorf(codes.Internal, "marshal response: %v", err)
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}
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return &pb.InspectContainerResponse{Response: respBytes}, nil
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}
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// StartContainer starts a container with the given ID and options.
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func (s *Server) StartContainer(ctx context.Context, req *pb.StartContainerRequest) (*emptypb.Empty, error) {
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var opts container.StartOptions
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if len(req.Options) > 0 {
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if err := json.Unmarshal(req.Options, &opts); err != nil {
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return nil, status.Errorf(codes.InvalidArgument, "unmarshal options: %v", err)
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}
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}
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if err := s.client.ContainerStart(ctx, req.Id, opts); err != nil {
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if client.IsErrNotFound(err) {
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return nil, status.Errorf(codes.NotFound, err.Error())
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}
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return nil, status.Errorf(codes.Internal, err.Error())
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}
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return &emptypb.Empty{}, nil
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}
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// StopContainer stops a container with the given ID and options.
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func (s *Server) StopContainer(ctx context.Context, req *pb.StopContainerRequest) (*emptypb.Empty, error) {
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var opts container.StopOptions
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if len(req.Options) > 0 {
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if err := json.Unmarshal(req.Options, &opts); err != nil {
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return nil, status.Errorf(codes.InvalidArgument, "unmarshal options: %v", err)
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}
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}
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if err := s.client.ContainerStop(ctx, req.Id, opts); err != nil {
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if client.IsErrNotFound(err) {
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return nil, status.Errorf(codes.NotFound, err.Error())
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}
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return nil, status.Errorf(codes.Internal, err.Error())
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}
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return &emptypb.Empty{}, nil
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}
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func (s *Server) ListContainers(ctx context.Context, req *pb.ListContainersRequest) (*pb.ListContainersResponse, error) {
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var opts container.ListOptions
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if len(req.Options) > 0 {
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if err := json.Unmarshal(req.Options, &opts); err != nil {
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return nil, status.Errorf(codes.InvalidArgument, "unmarshal options: %v", err)
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}
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// Handle filters separately because they implement custom JSON unmarshalling.
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var raw map[string]json.RawMessage
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if err := json.Unmarshal(req.Options, &raw); err != nil {
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return nil, status.Errorf(codes.InvalidArgument, "unmarshal options to raw map: %v", err)
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}
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if filtersBytes, ok := raw["Filters"]; ok {
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args, err := filters.FromJSON(string(filtersBytes))
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if err != nil {
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return nil, status.Errorf(codes.InvalidArgument, "unmarshal filters: %v", err)
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}
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opts.Filters = args
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}
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}
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containerSummaries, err := s.client.ContainerList(ctx, opts)
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if err != nil {
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return nil, status.Errorf(codes.Internal, err.Error())
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}
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containers := make([]types.ContainerJSON, 0, len(containerSummaries))
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for _, cs := range containerSummaries {
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c, err := s.client.ContainerInspect(ctx, cs.ID)
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if err != nil {
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if client.IsErrNotFound(err) {
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// The listed container may have been removed while we were inspecting other containers.
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continue
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}
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return nil, status.Errorf(codes.Internal, "inspect container %s: %v", cs.ID, err)
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}
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containers = append(containers, c)
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}
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containersBytes, err := json.Marshal(containers)
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if err != nil {
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return nil, status.Errorf(codes.Internal, "marshal containers: %v", err)
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}
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return &pb.ListContainersResponse{
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Messages: []*pb.MachineContainers{
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{
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Containers: containersBytes,
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},
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},
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}, nil
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}
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// RemoveContainer stops (kills after grace period) and removes a container with the given ID.
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func (s *Server) RemoveContainer(ctx context.Context, req *pb.RemoveContainerRequest) (*emptypb.Empty, error) {
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var opts container.RemoveOptions
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if len(req.Options) > 0 {
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if err := json.Unmarshal(req.Options, &opts); err != nil {
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return nil, status.Errorf(codes.InvalidArgument, "unmarshal options: %v", err)
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}
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}
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if err := s.client.ContainerRemove(ctx, req.Id, opts); err != nil {
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if client.IsErrNotFound(err) {
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return nil, status.Errorf(codes.NotFound, err.Error())
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}
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return nil, status.Errorf(codes.Internal, err.Error())
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}
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return &emptypb.Empty{}, nil
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}
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func (s *Server) PullImage(req *pb.PullImageRequest, stream grpc.ServerStreamingServer[pb.JSONMessage]) error {
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ctx := stream.Context()
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// TODO: replace with another JSON serializable type (PullOptions.PrivilegeFunc is not serializable).
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var opts image.PullOptions
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if len(req.Options) > 0 {
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if err := json.Unmarshal(req.Options, &opts); err != nil {
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return status.Errorf(codes.InvalidArgument, "unmarshal options: %v", err)
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}
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}
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respBody, err := s.client.ImagePull(ctx, req.Image, opts)
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if err != nil {
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return status.Errorf(codes.Internal, err.Error())
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}
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defer respBody.Close()
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decoder := json.NewDecoder(respBody)
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errCh := make(chan error, 1)
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go func() {
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var raw json.RawMessage
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for {
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if err = decoder.Decode(&raw); err != nil {
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if errors.Is(err, io.EOF) {
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errCh <- nil
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return
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}
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errCh <- status.Errorf(codes.Internal, "decode image pull message: %v", err)
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return
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}
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if err = stream.Send(&pb.JSONMessage{Message: raw}); err != nil {
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errCh <- status.Errorf(codes.Internal, "send image pull message to stream: %v", err)
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return
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}
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}
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}()
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for {
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select {
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case err = <-errCh:
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return err
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case <-ctx.Done():
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return status.Errorf(codes.Canceled, ctx.Err().Error())
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}
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}
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}
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// InspectImage returns the image information for the given image ID.
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func (s *Server) InspectImage(ctx context.Context, req *pb.InspectImageRequest) (*pb.InspectImageResponse, error) {
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resp, _, err := s.client.ImageInspectWithRaw(ctx, req.Id)
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if err != nil {
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if client.IsErrNotFound(err) {
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return nil, status.Errorf(codes.NotFound, err.Error())
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}
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return nil, status.Errorf(codes.Internal, err.Error())
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}
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respBytes, err := json.Marshal(resp)
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if err != nil {
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return nil, status.Errorf(codes.Internal, "marshal response: %v", err)
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}
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return &pb.InspectImageResponse{
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Messages: []*pb.Image{
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{
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Image: respBytes,
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},
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},
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}, nil
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}
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// InspectRemoteImage returns the image metadata for an image in a remote registry using the machine's Docker auth
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// credentials if necessary.
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func (s *Server) InspectRemoteImage(
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_ context.Context, req *pb.InspectRemoteImageRequest,
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) (*pb.InspectRemoteImageResponse, error) {
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ref, err := name.ParseReference(req.Id)
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if err != nil {
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return nil, status.Errorf(codes.InvalidArgument, "parse image: %v", err)
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}
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desc, err := remote.Get(ref, remote.WithAuthFromKeychain(authn.DefaultKeychain))
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if err != nil {
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return nil, status.Errorf(codes.Internal, "fetch image manifest: %v", err)
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}
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namedRef, err := reference.ParseNormalizedNamed(ref.String())
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if err != nil {
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return nil, status.Errorf(codes.InvalidArgument, "parse image: %v", err)
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}
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var canonicalRef reference.Canonical
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if _, ok := namedRef.(reference.Canonical); ok {
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canonicalRef = namedRef.(reference.Canonical)
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} else {
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if canonicalRef, err = reference.WithDigest(namedRef, digest.Digest(desc.Digest.String())); err != nil {
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return nil, status.Errorf(codes.Internal, "add digest to image: %v", err)
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}
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}
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return &pb.InspectRemoteImageResponse{
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Messages: []*pb.RemoteImage{
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{
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Reference: reference.FamiliarString(canonicalRef),
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Manifest: desc.Manifest,
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},
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},
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}, nil
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}
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// CreateServiceContainer creates a new container for the service with the given specifications.
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func (s *Server) CreateServiceContainer(
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ctx context.Context, req *pb.CreateServiceContainerRequest,
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) (*pb.CreateContainerResponse, error) {
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if !api.ValidateServiceID(req.ServiceId) {
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return nil, status.Errorf(codes.InvalidArgument, "invalid service ID: '%s'", req.ServiceId)
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}
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var spec api.ServiceSpec
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if err := json.Unmarshal(req.ServiceSpec, &spec); err != nil {
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return nil, status.Errorf(codes.InvalidArgument, "unmarshal service spec: %v", err)
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}
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spec.ApplyDefaults()
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if err := spec.Validate(); err != nil {
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return nil, status.Errorf(codes.InvalidArgument, "invalid service spec: %v", err)
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}
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containerName := req.ContainerName
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if containerName == "" {
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suffix, err := secret.RandomAlphaNumeric(4)
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if err != nil {
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return nil, fmt.Errorf("generate random suffix: %w", err)
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}
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containerName = fmt.Sprintf("%s-%s", spec.Name, suffix)
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}
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// TODO: do not set the immutable hash as container label once container diff uses the spec stored in DB.
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specHash, err := spec.ImmutableHash()
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if err != nil {
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return nil, fmt.Errorf("calculate immutable hash for service spec: %w", err)
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}
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config := &container.Config{
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Cmd: spec.Container.Command,
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Entrypoint: spec.Container.Entrypoint,
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Hostname: containerName,
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Image: spec.Container.Image,
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Labels: map[string]string{
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api.LabelServiceID: req.ServiceId,
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api.LabelServiceName: spec.Name,
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api.LabelServiceMode: spec.Mode,
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api.LabelServiceSpecHash: specHash,
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api.LabelManaged: "",
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},
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}
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if spec.Mode == "" {
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config.Labels[api.LabelServiceMode] = api.ServiceModeReplicated
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}
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// TODO: do not set the ports as container labels once migrated to retrieve them from the spec in DB.
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if len(spec.Ports) > 0 {
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encodedPorts := make([]string, len(spec.Ports))
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for i, p := range spec.Ports {
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encodedPorts[i], err = p.String()
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if err != nil {
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return nil, fmt.Errorf("encode service port spec: %w", err)
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}
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}
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config.Labels[api.LabelServicePorts] = strings.Join(encodedPorts, ",")
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}
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portBindings := make(nat.PortMap)
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for _, p := range spec.Ports {
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if p.Mode != api.PortModeHost {
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continue
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}
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port := nat.Port(fmt.Sprintf("%d/%s", p.ContainerPort, p.Protocol))
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portBindings[port] = []nat.PortBinding{
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{
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HostPort: strconv.Itoa(int(p.PublishedPort)),
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},
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}
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if p.HostIP.IsValid() {
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portBindings[port][0].HostIP = p.HostIP.String()
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}
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}
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hostConfig := &container.HostConfig{
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Binds: spec.Container.Volumes,
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Init: spec.Container.Init,
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PortBindings: portBindings,
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// Always restart service containers if they exit or a machine restarts.
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// For one-off containers and batch jobs we plan to use a different service type/mode.
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RestartPolicy: container.RestartPolicy{
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Name: container.RestartPolicyAlways,
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},
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}
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networkConfig := &network.NetworkingConfig{
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EndpointsConfig: map[string]*network.EndpointSettings{
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NetworkName: {},
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},
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}
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resp, err := s.client.ContainerCreate(ctx, config, hostConfig, networkConfig, nil, containerName)
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if err != nil {
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if client.IsErrNotFound(err) {
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return nil, status.Error(codes.NotFound, err.Error())
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}
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return nil, status.Error(codes.Internal, err.Error())
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}
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respBytes, err := json.Marshal(resp)
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if err != nil {
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return nil, status.Errorf(codes.Internal, "marshal response: %v", err)
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}
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return &pb.CreateContainerResponse{Response: respBytes}, nil
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}
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