engine

package
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 Go to latest Published: May 12, 2018 License: Apache-2.0, BSD-2-Clause, BSD-3-Clause, + 4 more Imports: 29 Imported by: 0

Documentation

Overview

Package engine contains code for interacting with container-running backends and handling events from them. It supports Docker as the sole task engine type.

Package engine contains the core logic for managing tasks

Index

Constants

View Source 
const (
	//DockerEndpointEnvVariable is the environment variable that can override the Docker endpoint
	DockerEndpointEnvVariable = "DOCKER_HOST"
	// DockerDefaultEndpoint is the default value for the Docker endpoint
	DockerDefaultEndpoint = "unix:///var/run/docker.sock"
)

Variables

View Source 
var ImagePullDeleteLock sync.RWMutex

ImagePullDeleteLock ensures that pulls and deletes do not run at the same time and pulls can be run at the same time for docker >= 1.11.1 Pulls are serialized as a temporary workaround for a devicemapper issue. (see https://github.com/docker/docker/issues/9718) Deletes must not run at the same time as pulls to prevent deletion of images that are being used to launch new tasks.

Functions

This section is empty.

Types

type CannotGetDockerClientVersionError 

type CannotGetDockerClientVersionError struct {
	// contains filtered or unexported fields
}

CannotGetDockerClientVersionError indicates error when trying to get docker client api version

func (CannotGetDockerClientVersionError) Error 

func (err CannotGetDockerClientVersionError) Error() string

func (CannotGetDockerClientVersionError) ErrorName 

func (err CannotGetDockerClientVersionError) ErrorName() string

type ContainerNetworkingError 

type ContainerNetworkingError struct {
	// contains filtered or unexported fields
}

ContainerNetworkingError indicates any error when dealing with the network namespace of container

func (ContainerNetworkingError) Error 

func (err ContainerNetworkingError) Error() string

func (ContainerNetworkingError) ErrorName 

func (err ContainerNetworkingError) ErrorName() string

type ContainerVanishedError 

type ContainerVanishedError struct{}

ContainerVanishedError is a type for describing a container that does not exist

func (ContainerVanishedError) Error 

func (err ContainerVanishedError) Error() string

func (ContainerVanishedError) ErrorName 

func (err ContainerVanishedError) ErrorName() string

ErrorName returns the name of the error

type DockerTaskEngine 

type DockerTaskEngine struct {
	// contains filtered or unexported fields
}

DockerTaskEngine is a state machine for managing a task and its containers in ECS.

DockerTaskEngine implements an abstraction over the DockerGoClient so that it does not have to know about tasks, only containers The DockerTaskEngine interacts with Docker to implement a TaskEngine

func NewDockerTaskEngine 

func NewDockerTaskEngine(cfg *config.Config,
	client dockerapi.DockerClient,
	credentialsManager credentials.Manager,
	containerChangeEventStream *eventstream.EventStream,
	imageManager ImageManager,
	state dockerstate.TaskEngineState,
	metadataManager containermetadata.Manager,
	resource resources.Resource) *DockerTaskEngine

NewDockerTaskEngine returns a created, but uninitialized, DockerTaskEngine. The distinction between created and initialized is that when created it may be serialized/deserialized, but it will not communicate with docker until it is also initialized.

func (*DockerTaskEngine) AddTask 

func (engine *DockerTaskEngine) AddTask(task *api.Task) error

AddTask starts tracking a task

func (*DockerTaskEngine) Disable 

func (engine *DockerTaskEngine) Disable()

Disable prevents this engine from managing any additional tasks.

func (*DockerTaskEngine) GetTaskByArn 

func (engine *DockerTaskEngine) GetTaskByArn(arn string) (*api.Task, bool)

GetTaskByArn returns the task identified by that ARN

func (*DockerTaskEngine) Init 

func (engine *DockerTaskEngine) Init(ctx context.Context) error

Init initializes a DockerTaskEngine such that it may communicate with docker and operate normally. This function must be called before any other function, except serializing and deserializing, can succeed without error.

func (*DockerTaskEngine) ListTasks 

func (engine *DockerTaskEngine) ListTasks() ([]*api.Task, error)

ListTasks returns the tasks currently managed by the DockerTaskEngine

func (*DockerTaskEngine) MarshalJSON 

func (engine *DockerTaskEngine) MarshalJSON() ([]byte, error)

MarshalJSON marshals into state directly

func (*DockerTaskEngine) MustInit 

func (engine *DockerTaskEngine) MustInit(ctx context.Context)

MustInit blocks and retries until an engine can be initialized.

func (*DockerTaskEngine) SetSaver 

func (engine *DockerTaskEngine) SetSaver(saver statemanager.Saver)

SetSaver sets the saver that is used by the DockerTaskEngine

func (*DockerTaskEngine) Shutdown 

func (engine *DockerTaskEngine) Shutdown()

Shutdown makes a best-effort attempt to cleanup after the task engine. This should not be relied on for anything more complicated than testing.

func (*DockerTaskEngine) State 

func (engine *DockerTaskEngine) State() dockerstate.TaskEngineState

State is a function primarily meant for testing usage; it is explicitly not part of the TaskEngine interface and should not be relied upon. It returns an internal representation of the state of this DockerTaskEngine.

func (*DockerTaskEngine) StateChangeEvents 

func (engine *DockerTaskEngine) StateChangeEvents() chan statechange.Event

StateChangeEvents returns channels to read task and container state changes. These changes should be read as soon as possible as them not being read will block processing the task referenced by the event.

func (*DockerTaskEngine) UnmarshalJSON 

func (engine *DockerTaskEngine) UnmarshalJSON(data []byte) error

UnmarshalJSON restores a previously marshaled task-engine state from json

func (*DockerTaskEngine) Version 

func (engine *DockerTaskEngine) Version() (string, error)

Version returns the underlying docker version.

type ImageManager 

type ImageManager interface {
	RecordContainerReference(container *api.Container) error
	RemoveContainerReferenceFromImageState(container *api.Container) error
	AddAllImageStates(imageStates []*image.ImageState)
	GetImageStateFromImageName(containerImageName string) (*image.ImageState, bool)
	StartImageCleanupProcess(ctx context.Context)
	SetSaver(stateManager statemanager.Saver)
}

ImageManager is responsible for saving the Image states, adding and removing container references to ImageStates

func NewImageManager 

func NewImageManager(cfg *config.Config, client dockerapi.DockerClient, state dockerstate.TaskEngineState) ImageManager

NewImageManager returns a new ImageManager

type ImageStatesForDeletion 

type ImageStatesForDeletion []*image.ImageState

ImageStatesForDeletion is used for implementing the sort interface

func (ImageStatesForDeletion) Len 

func (imageStates ImageStatesForDeletion) Len() int

Implementing sort interface based on last used times of the images

func (ImageStatesForDeletion) Less 

func (imageStates ImageStatesForDeletion) Less(i, j int) bool

func (ImageStatesForDeletion) Swap 

func (imageStates ImageStatesForDeletion) Swap(i, j int)

type TaskDependencyError 

type TaskDependencyError struct {
	// contains filtered or unexported fields
}

TaskDependencyError is the error for task that dependencies can't be resolved

func (TaskDependencyError) Error 

func (err TaskDependencyError) Error() string

func (TaskDependencyError) ErrorName 

func (err TaskDependencyError) ErrorName() string

ErrorName is the name of the error

type TaskEngine 

type TaskEngine interface {
	Init(context.Context) error
	MustInit(context.Context)
	// Disable *must* only be called when this engine will no longer be used
	// (e.g. right before exiting down the process). It will irreversably stop
	// this task engine from processing new tasks
	Disable()

	// StateChangeEvents will provide information about tasks that have been previously
	// executed. Specifically, it will provide information when they reach
	// running or stopped, as well as providing portbinding and other metadata
	StateChangeEvents() chan statechange.Event
	SetSaver(statemanager.Saver)

	// AddTask adds a new task to the task engine and manages its container's
	// lifecycle. If it returns an error, the task was not added.
	AddTask(*api.Task) error

	// ListTasks lists all the tasks being managed by the TaskEngine.
	ListTasks() ([]*api.Task, error)

	// GetTaskByArn gets a managed task, given a task arn.
	GetTaskByArn(string) (*api.Task, bool)

	Version() (string, error)

	json.Marshaler
	json.Unmarshaler
}

TaskEngine is an interface for the DockerTaskEngine

func NewTaskEngine 

func NewTaskEngine(cfg *config.Config, client dockerapi.DockerClient,
	credentialsManager credentials.Manager,
	containerChangeEventStream *eventstream.EventStream,
	imageManager ImageManager, state dockerstate.TaskEngineState,
	metadataManager containermetadata.Manager,
	resource resources.Resource) TaskEngine

NewTaskEngine returns a default TaskEngine

type TaskStoppedBeforePullBeginError 

type TaskStoppedBeforePullBeginError struct {
	// contains filtered or unexported fields
}

TaskStoppedBeforePullBeginError is a type for task errors involving pull

func (TaskStoppedBeforePullBeginError) Error 

func (err TaskStoppedBeforePullBeginError) Error() string

func (TaskStoppedBeforePullBeginError) ErrorName 

func (TaskStoppedBeforePullBeginError) ErrorName() string

ErrorName returns the name of the error

Source Files

View all Source files

Directories

Path Synopsis
mocks
Package mock_dockerstate is a generated GoMock package.
 Package mock_dockerstate is a generated GoMock package.
testutils
Package testutils contains files that are used in tests but not elsewhere and thus can be excluded from the final executable.
 Package testutils contains files that are used in tests but not elsewhere and thus can be excluded from the final executable.
Package mock_engine is a generated GoMock package.
 Package mock_engine is a generated GoMock package.
Package testutils contains files that are used in tests but not elsewhere and thus can be excluded from the final executable.
 Package testutils contains files that are used in tests but not elsewhere and thus can be excluded from the final executable.

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