Documentation
¶
Index ¶
- Constants
- func Manifold(config ManifoldConfig) dependency.Manifold
- func NewUniterResolver(cfg ResolverConfig) resolver.Resolver
- func NewUpdateStatusTimer() func() <-chan time.Time
- func TranslateFortressErrors(err error) error
- type ChannelCommandRunner
- type ChannelCommandRunnerConfig
- type CommandRunner
- type JujuRunServer
- type ManifoldConfig
- type NewExecutorFunc
- type Paths
- type ResolverConfig
- type RunCommandsArgs
- type RunListener
- type RunListenerConfig
- type RuntimePaths
- type StatePaths
- type Uniter
- type UniterExecutionObserver
- type UniterParams
Constants ¶
const JujuRunEndpoint = "JujuRunServer.RunCommands"
Variables ¶
This section is empty.
Functions ¶
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 NewUniterResolver ¶
func NewUniterResolver(cfg ResolverConfig) resolver.Resolver
NewUniterResolver returns a new resolver.Resolver for the uniter.
func NewUpdateStatusTimer ¶
NewUpdateStatusTimer returns a timed signal suitable for update-status hook.
func TranslateFortressErrors ¶
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.
Types ¶
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 ManifoldConfig ¶
type ManifoldConfig struct {
AgentName string
APICallerName string
MachineLockName string
Clock clock.Clock
LeadershipTrackerName string
CharmDirName string
HookRetryStrategyName string
TranslateResolverErr func(error) error
}
ManifoldConfig defines the names of the manifolds on which a Manifold will depend.
type NewExecutorFunc ¶
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 ¶
NewPaths returns the set of filesystem paths that the supplied unit should use, given the supplied root juju data directory path.
func NewWorkerPaths ¶
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.
func (Paths) ComponentDir ¶
ComponentDir returns the filesystem path to the directory containing all data files for a component.
func (Paths) GetCharmDir ¶
GetCharmDir exists to satisfy the context.Paths interface.
func (Paths) GetJujucSocket ¶
GetJujucSocket exists to satisfy the context.Paths interface.
func (Paths) GetMetricsSpoolDir ¶
GetMetricsSpoolDir exists to satisfy the runner.Paths interface.
func (Paths) GetToolsDir ¶
GetToolsDir exists to satisfy the context.Paths interface.
type ResolverConfig ¶
type ResolverConfig struct {
ClearResolved func() error
ReportHookError func(hook.Info) error
ShouldRetryHooks bool
StartRetryHookTimer func()
StopRetryHookTimer func()
Leadership resolver.Resolver
Actions resolver.Resolver
Relations resolver.Resolver
Storage resolver.Resolver
Commands resolver.Resolver
}
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
// ForceRemoteUnit skips relation membership and existence validation.
ForceRemoteUnit bool
}
RunCommandsArgs stores the arguments for a RunCommands call.
type RunListener ¶
type RunListener struct {
RunListenerConfig
// 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(cfg RunListenerConfig) (*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 (s *RunListener) Close() error
Close immediately stops accepting connections, and blocks until all existing connections have been closed.
func (*RunListener) Run ¶
func (s *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.
type RunListenerConfig ¶
type RunListenerConfig struct {
// SocketPath is the path of the socket to listen on for run commands.
SocketPath string
// CommandRunner is the CommandRunner that will run commands.
CommandRunner CommandRunner
}
RunListenerConfig contains the configuration for a RunListener.
func (*RunListenerConfig) Validate ¶
func (cfg *RunListenerConfig) Validate() error
type RuntimePaths ¶
type RuntimePaths struct {
// JujuRunSocket listens for juju-run invocations, and is always
// active.
JujuRunSocket string
// JujucServerSocket listens for jujuc invocations, and is only
// active when supporting a jujuc execution context.
JujucServerSocket string
}
RuntimePaths represents the set of paths that are relevant at runtime.
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
// OperationsFile holds information about what the uniter is doing
// and/or has done.
OperationsFile string
// RelationsDir holds relation-specific information about what the
// uniter is doing and/or has done.
RelationsDir string
// BundlesDir holds downloaded charms.
BundlesDir string
// DeployerDir holds metadata about charms that are installing or have
// been installed.
DeployerDir string
// StorageDir holds storage-specific information about what the
// uniter is doing and/or has done.
StorageDir 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) RunCommands ¶
func (u *Uniter) RunCommands(args RunCommandsArgs) (results *exec.ExecResponse, err error)
RunCommands executes the supplied commands in a hook context.
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
LeadershipTracker leadership.Tracker
DataDir string
Downloader charm.Downloader
MachineLockName string
CharmDirGuard fortress.Guard
UpdateStatusSignal func() <-chan time.Time
HookRetryStrategy params.RetryStrategy
NewOperationExecutor NewExecutorFunc
TranslateResolverErr func(error) error
Clock clock.Clock
// 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
}
UniterParams hold all the necessary parameters for a new Uniter.
Source Files
¶
Directories
¶
| Path | Synopsis |
|---|---|
|
hook provides types that define the hooks known to the Uniter
|
hook provides types that define the hooks known to the Uniter |
|
relation implements persistent local storage of a unit's relation state, and translation of relation changes into hooks that need to be run.
|
relation implements persistent local storage of a unit's relation state, and translation of relation changes into hooks that need to be run. |
|
context
Package context contains the ContextFactory and Context definitions.
|
Package context contains the ContextFactory and Context definitions. |
|
jujuc
The worker/uniter/runner/jujuc package implements the server side of the jujuc proxy tool, which forwards command invocations to the unit agent process so that they can be executed against specific state.
|
The worker/uniter/runner/jujuc package implements the server side of the jujuc proxy tool, which forwards command invocations to the unit agent process so that they can be executed against specific state. |
|
Package storage contains the storage subsystem for the uniter, responding to changes in storage attachments (lifecycle, volume/filesystem details) by queuing hooks and managing the storage attachments' lifecycle.
|
Package storage contains the storage subsystem for the uniter, responding to changes in storage attachments (lifecycle, volume/filesystem details) by queuing hooks and managing the storage attachments' lifecycle. |