endpoint.go

Documentation: k8s.io/kubernetes/pkg/kubelet/cm/devicemanager

     1  /*
     2  Copyright 2017 The Kubernetes 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 devicemanager
    18  
    19  import (
    20  	"context"
    21  	"fmt"
    22  	"sync"
    23  	"time"
    24  
    25  	pluginapi "k8s.io/kubelet/pkg/apis/deviceplugin/v1beta1"
    26  	plugin "k8s.io/kubernetes/pkg/kubelet/cm/devicemanager/plugin/v1beta1"
    27  )
    28  
    29  // endpoint maps to a single registered device plugin. It is responsible
    30  // for managing gRPC communications with the device plugin and caching
    31  // device states reported by the device plugin.
    32  type endpoint interface {
    33  	getPreferredAllocation(available, mustInclude []string, size int) (*pluginapi.PreferredAllocationResponse, error)
    34  	allocate(devs []string) (*pluginapi.AllocateResponse, error)
    35  	preStartContainer(devs []string) (*pluginapi.PreStartContainerResponse, error)
    36  	setStopTime(t time.Time)
    37  	isStopped() bool
    38  	stopGracePeriodExpired() bool
    39  }
    40  
    41  type endpointImpl struct {
    42  	mutex        sync.Mutex
    43  	resourceName string
    44  	api          pluginapi.DevicePluginClient
    45  	stopTime     time.Time
    46  	client       plugin.Client // for testing only
    47  }
    48  
    49  // newEndpointImpl creates a new endpoint for the given resourceName.
    50  // This is to be used during normal device plugin registration.
    51  func newEndpointImpl(p plugin.DevicePlugin) *endpointImpl {
    52  	return &endpointImpl{
    53  		api:          p.API(),
    54  		resourceName: p.Resource(),
    55  	}
    56  }
    57  
    58  // newStoppedEndpointImpl creates a new endpoint for the given resourceName with stopTime set.
    59  // This is to be used during Kubelet restart, before the actual device plugin re-registers.
    60  func newStoppedEndpointImpl(resourceName string) *endpointImpl {
    61  	return &endpointImpl{
    62  		resourceName: resourceName,
    63  		stopTime:     time.Now(),
    64  	}
    65  }
    66  
    67  func (e *endpointImpl) isStopped() bool {
    68  	e.mutex.Lock()
    69  	defer e.mutex.Unlock()
    70  	return !e.stopTime.IsZero()
    71  }
    72  
    73  func (e *endpointImpl) stopGracePeriodExpired() bool {
    74  	e.mutex.Lock()
    75  	defer e.mutex.Unlock()
    76  	return !e.stopTime.IsZero() && time.Since(e.stopTime) > endpointStopGracePeriod
    77  }
    78  
    79  func (e *endpointImpl) setStopTime(t time.Time) {
    80  	e.mutex.Lock()
    81  	defer e.mutex.Unlock()
    82  	e.stopTime = t
    83  }
    84  
    85  // getPreferredAllocation issues GetPreferredAllocation gRPC call to the device plugin.
    86  func (e *endpointImpl) getPreferredAllocation(available, mustInclude []string, size int) (*pluginapi.PreferredAllocationResponse, error) {
    87  	if e.isStopped() {
    88  		return nil, fmt.Errorf(errEndpointStopped, e)
    89  	}
    90  	return e.api.GetPreferredAllocation(context.Background(), &pluginapi.PreferredAllocationRequest{
    91  		ContainerRequests: []*pluginapi.ContainerPreferredAllocationRequest{
    92  			{
    93  				AvailableDeviceIDs:   available,
    94  				MustIncludeDeviceIDs: mustInclude,
    95  				AllocationSize:       int32(size),
    96  			},
    97  		},
    98  	})
    99  }
   100  
   101  // allocate issues Allocate gRPC call to the device plugin.
   102  func (e *endpointImpl) allocate(devs []string) (*pluginapi.AllocateResponse, error) {
   103  	if e.isStopped() {
   104  		return nil, fmt.Errorf(errEndpointStopped, e)
   105  	}
   106  	return e.api.Allocate(context.Background(), &pluginapi.AllocateRequest{
   107  		ContainerRequests: []*pluginapi.ContainerAllocateRequest{
   108  			{DevicesIDs: devs},
   109  		},
   110  	})
   111  }
   112  
   113  // preStartContainer issues PreStartContainer gRPC call to the device plugin.
   114  func (e *endpointImpl) preStartContainer(devs []string) (*pluginapi.PreStartContainerResponse, error) {
   115  	if e.isStopped() {
   116  		return nil, fmt.Errorf(errEndpointStopped, e)
   117  	}
   118  	ctx, cancel := context.WithTimeout(context.Background(), pluginapi.KubeletPreStartContainerRPCTimeoutInSecs*time.Second)
   119  	defer cancel()
   120  	return e.api.PreStartContainer(ctx, &pluginapi.PreStartContainerRequest{
   121  		DevicesIDs: devs,
   122  	})
   123  }
   124
View as plain text