dependencygraph

Documentation

Index

• Variables
• func DependenciesAreResolved(target *apicontainer.Container, by []*apicontainer.Container, id string, ...) error
• func ValidDependencies(task *apitask.Task) bool

Variables

var (
	// CredentialsNotResolvedErr is the error where a container needs to wait for
	// credentials before it can process by agent
	CredentialsNotResolvedErr = errors.New("dependency graph: container execution credentials not available")
	// DependentContainerNotResolvedErr is the error where a dependent container isn't in expected state
	DependentContainerNotResolvedErr = errors.New("dependency graph: dependent container not in expected state")
	// ContainerPastDesiredStatusErr is the error where the container status is bigger than desired status
	ContainerPastDesiredStatusErr = errors.New("container transition: container status is equal or greater than desired status")

	// ErrContainerDependencyNotResolved is when the container's dependencies
	// on other containers are not resolved
	ErrContainerDependencyNotResolved = errors.New("dependency graph: dependency on containers not resolved")
	// ErrResourceDependencyNotResolved is when the container's dependencies
	// on task resources are not resolved
	ErrResourceDependencyNotResolved = errors.New("dependency graph: dependency on resources not resolved")
)

Functions

func DependenciesAreResolved

func DependenciesAreResolved(target *apicontainer.Container,
	by []*apicontainer.Container,
	id string,
	manager credentials.Manager,
	resources []taskresource.TaskResource) error

DependenciesAreResolved validates that the `target` container can be transitioned given the current known state of the containers in `by`. If this function returns true, `target` should be technically able to launch without issues. Transitions are between known statuses (whether the container can move to the next known status), not desired statuses; the desired status typically is either RUNNING or STOPPED.

func ValidDependencies

func ValidDependencies(task *apitask.Task) bool

ValidDependencies takes a task and verifies that it is possible to allow all containers within it to reach the desired status by proceeding in some order. ValidDependencies is called during DockerTaskEngine.AddTask to verify that a startup order can exist.