github.com/olljanat/moby@v1.13.1/daemon/cluster/executor/container/attachment.go (about)

     1  package container
     2  
     3  import (
     4  	executorpkg "github.com/docker/docker/daemon/cluster/executor"
     5  	"github.com/docker/swarmkit/agent/exec"
     6  	"github.com/docker/swarmkit/api"
     7  	"golang.org/x/net/context"
     8  )
     9  
    10  // networkAttacherController implements agent.Controller against docker's API.
    11  //
    12  // networkAttacherController manages the lifecycle of network
    13  // attachment of a docker unmanaged container managed as a task from
    14  // agent point of view. It provides network attachment information to
    15  // the unmanaged container for it to attach to the network and run.
    16  type networkAttacherController struct {
    17  	backend executorpkg.Backend
    18  	task    *api.Task
    19  	adapter *containerAdapter
    20  	closed  chan struct{}
    21  }
    22  
    23  func newNetworkAttacherController(b executorpkg.Backend, task *api.Task, secrets exec.SecretGetter) (*networkAttacherController, error) {
    24  	adapter, err := newContainerAdapter(b, task, secrets)
    25  	if err != nil {
    26  		return nil, err
    27  	}
    28  
    29  	return &networkAttacherController{
    30  		backend: b,
    31  		task:    task,
    32  		adapter: adapter,
    33  		closed:  make(chan struct{}),
    34  	}, nil
    35  }
    36  
    37  func (nc *networkAttacherController) Update(ctx context.Context, t *api.Task) error {
    38  	return nil
    39  }
    40  
    41  func (nc *networkAttacherController) Prepare(ctx context.Context) error {
    42  	// Make sure all the networks that the task needs are created.
    43  	if err := nc.adapter.createNetworks(ctx); err != nil {
    44  		return err
    45  	}
    46  
    47  	return nil
    48  }
    49  
    50  func (nc *networkAttacherController) Start(ctx context.Context) error {
    51  	return nc.adapter.networkAttach(ctx)
    52  }
    53  
    54  func (nc *networkAttacherController) Wait(pctx context.Context) error {
    55  	ctx, cancel := context.WithCancel(pctx)
    56  	defer cancel()
    57  
    58  	return nc.adapter.waitForDetach(ctx)
    59  }
    60  
    61  func (nc *networkAttacherController) Shutdown(ctx context.Context) error {
    62  	return nil
    63  }
    64  
    65  func (nc *networkAttacherController) Terminate(ctx context.Context) error {
    66  	return nil
    67  }
    68  
    69  func (nc *networkAttacherController) Remove(ctx context.Context) error {
    70  	// Try removing the network referenced in this task in case this
    71  	// task is the last one referencing it
    72  	if err := nc.adapter.removeNetworks(ctx); err != nil {
    73  		return err
    74  	}
    75  
    76  	return nil
    77  }
    78  
    79  func (nc *networkAttacherController) Close() error {
    80  	return nil
    81  }