add docker specifics

local/service/docker_log_streamer.go

@@ -0,0 +1,74 @@
+package service
+
+import (
+	"acc-server-manager/local/model"
+	"acc-server-manager/local/utl/logging"
+	"bufio"
+	"context"
+	"io"
+	"sync"
+
+	"github.com/docker/docker/api/types"
+	dockerclient "github.com/docker/docker/client"
+	"github.com/docker/docker/pkg/stdcopy"
+	"github.com/google/uuid"
+)
+
+type DockerLogStreamer struct {
+	client  *dockerclient.Client
+	cancels sync.Map // uuid.UUID → context.CancelFunc
+}
+
+func NewDockerLogStreamer(client *dockerclient.Client) *DockerLogStreamer {
+	return &DockerLogStreamer{client: client}
+}
+
+func (s *DockerLogStreamer) Start(ctx context.Context, server *model.Server, handleLine func(string)) error {
+	if _, exists := s.cancels.Load(server.ID); exists {
+		return nil
+	}
+	if server.ContainerID == "" {
+		logging.Warn("DockerLogStreamer.Start: no container ID for server %s, skipping", server.ID)
+		return nil
+	}
+
+	streamCtx, cancel := context.WithCancel(ctx)
+	s.cancels.Store(server.ID, cancel)
+
+	go func() {
+		defer s.cancels.Delete(server.ID)
+
+		rc, err := s.client.ContainerLogs(streamCtx, server.ContainerID, types.ContainerLogsOptions{
+			ShowStdout: true,
+			ShowStderr: true,
+			Follow:     true,
+			Timestamps: false,
+		})
+		if err != nil {
+			logging.Error("DockerLogStreamer: failed to attach to container %s: %v", server.ContainerID[:12], err)
+			return
+		}
+		defer rc.Close()
+
+		pr, pw := io.Pipe()
+		go func() {
+			defer pw.Close()
+			if _, err := stdcopy.StdCopy(pw, pw, rc); err != nil && err != io.EOF {
+				logging.Warn("DockerLogStreamer: stdcopy error for %s: %v", server.ServiceName, err)
+			}
+		}()
+
+		scanner := bufio.NewScanner(pr)
+		for scanner.Scan() {
+			handleLine(scanner.Text())
+		}
+	}()
+
+	return nil
+}
+
+func (s *DockerLogStreamer) Stop(serverID uuid.UUID) {
+	if v, ok := s.cancels.LoadAndDelete(serverID); ok {
+		v.(context.CancelFunc)()
+	}
+}