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Package uniter

v0.0.0-...-194c9aa
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The latest major version is .

Published: today | License: AGPL-3.0 | Module: github.com/juju/juju

Index

Constants

const JujuRunEndpoint = "JujuRunServer.RunCommands"

Variables

var (
	// ErrCAASUnitDead is the error returned from terminate or init
	// if the unit is Dead.
	ErrCAASUnitDead = errors.New("unit dead")
)

func Manifold

func Manifold(config ManifoldConfig) dependency.Manifold

Manifold returns a dependency manifold that runs a uniter worker, using the resource names defined in the supplied config.

func NewRunListenerWrapper

func NewRunListenerWrapper(rl *RunListener, logger Logger) worker.Worker

NewRunListenerWrapper returns a worker that will Close the supplied run listener when the worker is killed. The Wait() method will never return an error -- NewRunListener just drops the Run error on the floor and that's not what I'm fixing here.

func NewUniterResolver

func NewUniterResolver(cfg ResolverConfig) resolver.Resolver

NewUniterResolver returns a new resolver.Resolver for the uniter.

func NewUpdateStatusTimer

func NewUpdateStatusTimer() remotestate.UpdateStatusTimerFunc

NewUpdateStatusTimer returns a func returning timed signal suitable for update-status hook.

func StartUniter

func StartUniter(runner *worker.Runner, params *UniterParams) error

StartUniter creates a new Uniter and starts it using the specified runner.

func TranslateFortressErrors

func TranslateFortressErrors(err error) error

TranslateFortressErrors turns errors returned by dependent manifolds due to fortress lockdown (i.e. model migration) into an error which causes the resolver loop to be restarted. When this happens the uniter is about to be shut down anyway.

type ChannelCommandRunner

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

ChannelCommandRunner is a CommandRunner that registers command arguments in a runcommands.Commands, sends the returned IDs to a channel and waits for response callbacks.

func NewChannelCommandRunner

func NewChannelCommandRunner(cfg ChannelCommandRunnerConfig) (*ChannelCommandRunner, error)

NewChannelCommandRunner returns a new ChannelCommandRunner with the given configuration.

func (*ChannelCommandRunner) RunCommands

func (c *ChannelCommandRunner) RunCommands(args RunCommandsArgs) (results *exec.ExecResponse, err error)

RunCommands executes the supplied run commands by registering the arguments in a runcommands.Commands, and then sending the returned ID to a channel and waiting for a response callback.

type ChannelCommandRunnerConfig

type ChannelCommandRunnerConfig struct {
	// Abort is a channel that will be closed when the runner should abort
	// the execution of run commands.
	Abort <-chan struct{}

	// Commands is used to add commands received from the listener.
	Commands runcommands.Commands

	// CommandChannel will be sent the IDs of commands added to Commands.
	CommandChannel chan<- string
}

ChannelCommandRunnerConfig contains the configuration for a ChannelCommandRunner.

func (ChannelCommandRunnerConfig) Validate

func (cfg ChannelCommandRunnerConfig) Validate() error

type CommandRunner

type CommandRunner interface {
	RunCommands(RunCommandsArgs RunCommandsArgs) (results *exec.ExecResponse, err error)
}

A CommandRunner is something that will actually execute the commands and return the results of that execution in the exec.ExecResponse (which contains stdout, stderr, and return code).

type JujuRunServer

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

The JujuRunServer is the entity that has the methods that are called over the rpc connection.

func (*JujuRunServer) RunCommands

func (r *JujuRunServer) RunCommands(args RunCommandsArgs, result *exec.ExecResponse) error

RunCommands delegates the actual running to the runner and populates the response structure.

type Logger

type Logger interface {
	Errorf(string, ...interface{})
	Warningf(string, ...interface{})
	Infof(string, ...interface{})
	Debugf(string, ...interface{})
	Tracef(string, ...interface{})

	Child(string) loggo.Logger
}

Logger represents the methods used for logging messages.

type ManifoldConfig

type ManifoldConfig struct {
	AgentName             string
	APICallerName         string
	MachineLock           machinelock.Lock
	Clock                 clock.Clock
	LeadershipTrackerName string
	CharmDirName          string
	HookRetryStrategyName string
	TranslateResolverErr  func(error) error
	Logger                Logger
}

ManifoldConfig defines the names of the manifolds on which a Manifold will depend.

func (*ManifoldConfig) Validate

func (config *ManifoldConfig) Validate() error

Validate ensures all the required values for the config are set.

type NewOperationExecutorFunc

type NewOperationExecutorFunc func(operation.ExecutorConfig) (operation.Executor, error)

NewOperationExecutorFunc is a func which returns an operations.Executor.

type NewRunnerExecutorFunc

type NewRunnerExecutorFunc func(ProviderIDGetter, Paths) runner.ExecFunc

NewRunnerExecutorFunc defines the type of the NewRunnerExecutor.

type Paths

type Paths struct {

	// ToolsDir is the directory containing the jujud executable running this
	// process; and also containing jujuc tool symlinks to that executable. It's
	// the only path in this struct that is not typically pointing inside the
	// directory reserved for the exclusive use of this worker (typically
	// /var/lib/juju/agents/$UNIT_TAG/ )
	ToolsDir string

	// Runtime represents the set of paths that are relevant at runtime.
	Runtime RuntimePaths

	// State represents the set of paths that hold persistent local state for
	// the uniter.
	State StatePaths
}

Paths represents the set of filesystem paths a uniter worker has reason to care about.

func NewPaths

func NewPaths(dataDir string, unitTag names.UnitTag, socketConfig *SocketConfig) Paths

NewPaths returns the set of filesystem paths that the supplied unit should use, given the supplied root juju data directory path. If socketConfig is specified, all sockets will be TLS over TCP.

func NewWorkerPaths

func NewWorkerPaths(dataDir string, unitTag names.UnitTag, worker string, socketConfig *SocketConfig) Paths

NewWorkerPaths returns the set of filesystem paths that the supplied unit worker should use, given the supplied root juju data directory path and worker identifier. Distinct worker identifiers ensure that runtime paths of different worker do not interfere. If socketConfig is specified, all sockets will be TLS over TCP.

func (Paths) ComponentDir

func (paths Paths) ComponentDir(name string) string

ComponentDir returns the filesystem path to the directory containing all data files for a component.

func (Paths) GetBaseDir

func (paths Paths) GetBaseDir() string

GetBaseDir exists to satisfy the context.Paths interface.

func (Paths) GetCharmDir

func (paths Paths) GetCharmDir() string

GetCharmDir exists to satisfy the context.Paths interface.

func (Paths) GetJujucClientSocket

func (paths Paths) GetJujucClientSocket(remote bool) sockets.Socket

GetJujucClientSocket exists to satisfy the context.Paths interface.

func (Paths) GetJujucServerSocket

func (paths Paths) GetJujucServerSocket(remote bool) sockets.Socket

GetJujucServerSocket exists to satisfy the context.Paths interface.

func (Paths) GetMetricsSpoolDir

func (paths Paths) GetMetricsSpoolDir() string

GetMetricsSpoolDir exists to satisfy the runner.Paths interface.

func (Paths) GetToolsDir

func (paths Paths) GetToolsDir() string

GetToolsDir exists to satisfy the context.Paths interface.

type ProviderIDGetter

type ProviderIDGetter interface {
	ProviderID() string
	Refresh() error
	Name() string
}

ProviderIDGetter defines the API to get provider ID.

type RebootQuerier

type RebootQuerier interface {
	Query(tag names.Tag) (bool, error)
}

RebootQuerier is implemented by types that can deliver one-off machine reboot notifications to entities.

type RemoteInitFunc

type RemoteInitFunc func(remotestate.ContainerRunningStatus, <-chan struct{}) error

RemoteInitFunc is used to init remote state

type ResolverConfig

type ResolverConfig struct {
	ModelType           model.ModelType
	ClearResolved       func() error
	ReportHookError     func(hook.Info) error
	ShouldRetryHooks    bool
	StartRetryHookTimer func()
	StopRetryHookTimer  func()
	VerifyCharmProfile  resolver.Resolver
	UpgradeSeries       resolver.Resolver
	Reboot              resolver.Resolver
	Leadership          resolver.Resolver
	Actions             resolver.Resolver
	CreatedRelations    resolver.Resolver
	Relations           resolver.Resolver
	Storage             resolver.Resolver
	Commands            resolver.Resolver
	Container           resolver.Resolver
	Logger              Logger
}

ResolverConfig defines configuration for the uniter resolver.

type RunCommandsArgs

type RunCommandsArgs struct {
	// Commands is the arbitrary commands to execute on the unit
	Commands string
	// RelationId is the relation context to execute the commands in.
	RelationId int
	// RemoteUnitName is the remote unit for the relation context.
	RemoteUnitName string
	// RemoteUnitName is the remote unit for the relation context.
	RemoteApplicationName string
	// ForceRemoteUnit skips relation membership and existence validation.
	ForceRemoteUnit bool
	// UnitName is the unit for which the command is being run.
	UnitName string
	// Token is the unit token when run under CAAS environments for auth.
	Token string
	// Operator is true when the command should be run on the operator.
	// This only affects k8s workload charms.
	Operator bool
}

RunCommandsArgs stores the arguments for a RunCommands call.

type RunListener

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

RunListener is responsible for listening on the network connection and setting up the rpc server on that net connection. Also starts the go routine that listens and hands off the work.

func NewRunListener

func NewRunListener(socket sockets.Socket, logger Logger) (*RunListener, error)

NewRunListener returns a new RunListener that is listening on given socket or named pipe passed in. If a valid RunListener is returned, is has the go routine running, and should be closed by the creator when they are done with it.

func (*RunListener) Close

func (r *RunListener) Close() error

Close immediately stops accepting connections, and blocks until all existing connections have been closed.

func (*RunListener) RegisterRunner

func (r *RunListener) RegisterRunner(unitName string, runner CommandRunner)

RegisterRunner registers a command runner for a given unit.

func (*RunListener) Run

func (r *RunListener) Run() (err error)

Run accepts new connections until it encounters an error, or until Close is called, and then blocks until all existing connections have been closed.

func (*RunListener) RunCommands

func (r *RunListener) RunCommands(args RunCommandsArgs) (results *exec.ExecResponse, err error)

RunCommands executes the supplied commands in a hook context.

func (*RunListener) UnregisterRunner

func (r *RunListener) UnregisterRunner(unitName string)

UnregisterRunner unregisters a command runner for a given unit.

type RuntimePaths

type RuntimePaths struct {
	// JujuRunSocket listens for juju-run invocations, and is always
	// active.
	LocalJujuRunSocket SocketPair

	// RemoteJujuRunSocket listens for remote juju-run invocations.
	RemoteJujuRunSocket SocketPair

	// JujucServerSocket listens for jujuc invocations, and is only
	// active when supporting a jujuc execution context.
	LocalJujucServerSocket SocketPair

	// RemoteJujucServerSocket listens for remote jujuc invocations, and is only
	// active when supporting a jujuc execution context.
	RemoteJujucServerSocket SocketPair
}

RuntimePaths represents the set of paths that are relevant at runtime.

type SocketConfig

type SocketConfig struct {
	ServiceAddress  string
	OperatorAddress string
	TLSConfig       *tls.Config
}

SocketConfig specifies information for remote sockets.

type SocketPair

type SocketPair struct {
	Server sockets.Socket
	Client sockets.Socket
}

SocketPair is a server+client pair of socket descriptors.

type StatePaths

type StatePaths struct {
	// BaseDir is the unit agent's base directory.
	BaseDir string

	// CharmDir is the directory to which the charm the uniter runs is deployed.
	CharmDir string

	// BundlesDir holds downloaded charms.
	BundlesDir string

	// DeployerDir holds metadata about charms that are installing or have
	// been installed.
	DeployerDir string

	// MetricsSpoolDir acts as temporary storage for metrics being sent from
	// the uniter to state.
	MetricsSpoolDir string
}

StatePaths represents the set of paths that hold persistent local state for the uniter.

type Uniter

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

Uniter implements the capabilities of the unit agent. It is not intended to implement the actual *behaviour* of the unit agent; that responsibility is delegated to Mode values, which are expected to react to events and direct the uniter's responses to them.

func NewUniter

func NewUniter(uniterParams *UniterParams) (*Uniter, error)

NewUniter creates a new Uniter which will install, run, and upgrade a charm on behalf of the unit with the given unitTag, by executing hooks and operations provoked by changes in st.

func (*Uniter) Kill

func (u *Uniter) Kill()

func (*Uniter) RunCommands

func (u *Uniter) RunCommands(args RunCommandsArgs) (results *exec.ExecResponse, err error)

RunCommands executes the supplied commands in a hook context.

func (*Uniter) Wait

func (u *Uniter) Wait() error

type UniterExecutionObserver

type UniterExecutionObserver interface {
	HookCompleted(hookName string)
	HookFailed(hookName string)
}

A UniterExecutionObserver gets the appropriate methods called when a hook is executed and either succeeds or fails. Missing hooks don't get reported in this way.

type UniterParams

type UniterParams struct {
	UniterFacade                  *uniter.State
	UnitTag                       names.UnitTag
	ModelType                     model.ModelType
	LeadershipTrackerFunc         func(names.UnitTag) leadership.TrackerWorker
	DataDir                       string
	Downloader                    charm.Downloader
	MachineLock                   machinelock.Lock
	CharmDirGuard                 fortress.Guard
	UpdateStatusSignal            remotestate.UpdateStatusTimerFunc
	HookRetryStrategy             params.RetryStrategy
	NewOperationExecutor          NewOperationExecutorFunc
	NewProcessRunner              runner.NewRunnerFunc
	NewDeployer                   charm.NewDeployerFunc
	NewRemoteRunnerExecutor       NewRunnerExecutorFunc
	RemoteInitFunc                RemoteInitFunc
	RunListener                   *RunListener
	TranslateResolverErr          func(error) error
	Clock                         clock.Clock
	ApplicationChannel            watcher.NotifyChannel
	ContainerRunningStatusChannel watcher.NotifyChannel
	ContainerRunningStatusFunc    remotestate.ContainerRunningStatusFunc
	IsRemoteUnit                  bool
	SocketConfig                  *SocketConfig
	// TODO (mattyw, wallyworld, fwereade) Having the observer here make this approach a bit more legitimate, but it isn't.
	// the observer is only a stop gap to be used in tests. A better approach would be to have the uniter tests start hooks
	// that write to files, and have the tests watch the output to know that hooks have finished.
	Observer      UniterExecutionObserver
	RebootQuerier RebootQuerier
	Logger        Logger
}

UniterParams hold all the necessary parameters for a new Uniter.

Package Files

Documentation was rendered with GOOS=linux and GOARCH=amd64.

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