control

Documentation

Overview

Package control PluginManger manages loading, unloading, and swapping of plugins

Index

• Constants
• Variables
• func MonitorDurationOption(v time.Duration) monitorOption
• func New(opts ...PluginControlOpt) *pluginControl
• func NewConfig() *config
• func OptSetPluginConfig(cf *pluginConfig) pluginManagerOpt
• type MTTrie
  • func NewMTTrie() *MTTrie
  • func (mtt MTTrie) Add(mt *metricType)
  • func (m *MTTrie) DeleteByPlugin(lp *loadedPlugin)
  • func (mtt MTTrie) Fetch(ns []string) ([]*metricType, error)
  • func (mtt MTTrie) Get(ns []string) ([]*metricType, error)
  • func (mtt MTTrie) Remove(ns []string) error
  • func (m *MTTrie) RemoveMetric(mt metricType)
  • func (m *MTTrie) String() string
• type PluginControlOpt
  • func CacheExpiration(t time.Duration) PluginControlOpt
  • func MaxRunningPlugins(m int) PluginControlOpt
  • func OptSetConfig(cfg *config) PluginControlOpt

Constants

const (
	// DefaultClientTimeout - default timeout for a client connection attempt
	DefaultClientTimeout = time.Second * 3
	// DefaultHealthCheckTimeout - default timeout for a health check
	DefaultHealthCheckTimeout = time.Second * 1
	// DefaultHealthCheckFailureLimit - how any consecutive health check timeouts must occur to trigger a failure
	DefaultHealthCheckFailureLimit = 3
)

const (
	// PluginTrustDisabled - enum representing plugin trust disabled
	PluginTrustDisabled int = iota
	// PluginTrustEnabled - enum representing plugin trust enabled
	PluginTrustEnabled
	// PluginTrustWarn - enum representing plugin trust warning
	PluginTrustWarn
)

const (
	// MonitorStopped - enum representation of monitor stopped state
	MonitorStopped monitorState = iota - 1 // default is stopped
	// MonitorStarted - enum representation of monitor started state
	MonitorStarted

	// DefaultMonitorDuration - the default monitor duration.
	DefaultMonitorDuration = time.Second * 1
)

const (
	// DetectedState is the detected state of a plugin
	DetectedState pluginState = "detected"
	// LoadingState is the loading state of a plugin
	LoadingState pluginState = "loading"
	// LoadedState is the loaded state of a plugin
	LoadedState pluginState = "loaded"
	// UnloadedState is the unloaded state of a plugin
	UnloadedState pluginState = "unloaded"
)

const (
	// HandlerRegistrationName is the registered name of the control runner
	HandlerRegistrationName = "control.runner"

	// PluginRunning is the running state of a plugin
	PluginRunning availablePluginState = iota - 1 // Default value (0) is Running
	// PluginStopped is the stopped state of a plugin
	PluginStopped
	// PluginDisabled is the disabled state of a plugin
	PluginDisabled
)

Variables

var (
	ErrPoolNotFound = errors.New("plugin pool not found")
	ErrPoolEmpty    = errors.New("plugin pool is empty")
	ErrBadKey       = errors.New("bad key")
	ErrBadType      = errors.New("bad plugin type")
	ErrBadStrategy  = errors.New("bad strategy")
)

var (

	// ErrLoadedPluginNotFound - error message when a loaded plugin is not found
	ErrLoadedPluginNotFound = errors.New("Loaded plugin not found")
	// ErrControllerNotStarted - error message when the Controller was not started
	ErrControllerNotStarted = errors.New("Must start Controller before calling Load()")
)

var (
	// ErrPluginNotFound - error message when a plugin is not found
	ErrPluginNotFound = errors.New("plugin not found")
	// ErrPluginAlreadyLoaded - error message when a plugin is already loaded
	ErrPluginAlreadyLoaded = errors.New("plugin is already loaded")
	// ErrPluginNotInLoadedState - error message when a plugin must ne in a loaded state
	ErrPluginNotInLoadedState = errors.New("Plugin must be in a LoadedState")
)

var ErrNotFound = errors.New("metric not found")

ErrNotFound is returned when Get cannot find the given namespace

Functions

func MonitorDurationOption

func MonitorDurationOption(v time.Duration) monitorOption

MonitorDurationOption sets monitor's duration to v.

func New

func New(opts ...PluginControlOpt) *pluginControl

New returns a new pluginControl instance

func NewConfig

func NewConfig() *config

NewConfig returns a reference to a global config type for the snap daemon by using a newly created empty plugin config.

func OptSetPluginConfig

func OptSetPluginConfig(cf *pluginConfig) pluginManagerOpt

OptSetPluginConfig sets the config on the plugin manager

Types

type MTTrie

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

MTTrie struct representing the root in the trie

func NewMTTrie

func NewMTTrie() *MTTrie

NewMTTrie returns an empty trie

func (MTTrie) Add

func (mtt MTTrie) Add(mt *metricType)

Add adds a node with the given namespace with the given MetricType

func (*MTTrie) DeleteByPlugin

func (m *MTTrie) DeleteByPlugin(lp *loadedPlugin)

DeleteByPlugin removes all metrics from the catalog if they match a loadedPlugin

func (MTTrie) Fetch

func (mtt MTTrie) Fetch(ns []string) ([]*metricType, error)

Fetch collects all children below a given namespace and concatenates their metric types into a single slice

func (MTTrie) Get

func (mtt MTTrie) Get(ns []string) ([]*metricType, error)

Get works like fetch, but only returns the MT at the given node and does not gather the node's children.

func (MTTrie) Remove

func (mtt MTTrie) Remove(ns []string) error

Remove removes all children below a given namespace

func (*MTTrie) RemoveMetric

func (m *MTTrie) RemoveMetric(mt metricType)

RemoveMetric removes a specific metric by namespace and version from the tree

func (*MTTrie) String

func (m *MTTrie) String() string

String prints out of the tr(i)e

type PluginControlOpt

type PluginControlOpt func(*pluginControl)

PluginControlOpt is used to set optional parameters on the pluginControl struct

func CacheExpiration

func CacheExpiration(t time.Duration) PluginControlOpt

CacheExpiration is the PluginControlOpt which sets the global metric cache TTL

func MaxRunningPlugins

func MaxRunningPlugins(m int) PluginControlOpt

MaxRunningPlugins sets the maximum number of plugins to run per pool

func OptSetConfig

func OptSetConfig(cfg *config) PluginControlOpt

OptSetConfig sets the plugin control configuration.