github.com/demonoid81/containerd@v1.3.4/runtime/monitor.go (about)

     1  /*
     2     Copyright The containerd Authors.
     3  
     4     Licensed under the Apache License, Version 2.0 (the "License");
     5     you may not use this file except in compliance with the License.
     6     You may obtain a copy of the License at
     7  
     8         http://www.apache.org/licenses/LICENSE-2.0
     9  
    10     Unless required by applicable law or agreed to in writing, software
    11     distributed under the License is distributed on an "AS IS" BASIS,
    12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13     See the License for the specific language governing permissions and
    14     limitations under the License.
    15  */
    16  
    17  package runtime
    18  
    19  // TaskMonitor provides an interface for monitoring of containers within containerd
    20  type TaskMonitor interface {
    21  	// Monitor adds the provided container to the monitor
    22  	Monitor(Task) error
    23  	// Stop stops and removes the provided container from the monitor
    24  	Stop(Task) error
    25  }
    26  
    27  // NewMultiTaskMonitor returns a new TaskMonitor broadcasting to the provided monitors
    28  func NewMultiTaskMonitor(monitors ...TaskMonitor) TaskMonitor {
    29  	return &multiTaskMonitor{
    30  		monitors: monitors,
    31  	}
    32  }
    33  
    34  // NewNoopMonitor is a task monitor that does nothing
    35  func NewNoopMonitor() TaskMonitor {
    36  	return &noopTaskMonitor{}
    37  }
    38  
    39  type noopTaskMonitor struct {
    40  }
    41  
    42  func (mm *noopTaskMonitor) Monitor(c Task) error {
    43  	return nil
    44  }
    45  
    46  func (mm *noopTaskMonitor) Stop(c Task) error {
    47  	return nil
    48  }
    49  
    50  type multiTaskMonitor struct {
    51  	monitors []TaskMonitor
    52  }
    53  
    54  func (mm *multiTaskMonitor) Monitor(c Task) error {
    55  	for _, m := range mm.monitors {
    56  		if err := m.Monitor(c); err != nil {
    57  			return err
    58  		}
    59  	}
    60  	return nil
    61  }
    62  
    63  func (mm *multiTaskMonitor) Stop(c Task) error {
    64  	for _, m := range mm.monitors {
    65  		if err := m.Stop(c); err != nil {
    66  			return err
    67  		}
    68  	}
    69  	return nil
    70  }