tsmon

Documentation

Overview

Package tsmon contains global state and utility functions for configuring and interacting with tsmon. This has a similar API to the infra-python ts_mon module.

If your application accepts command line flags, then call InitializeFromFlags from your main function.

If you use tsmon on AppEngine, then see appengine/tsmon package doc.

Index

• Constants
• func Flush(c context.Context) error
• func Initialize(c context.Context, m monitor.Monitor, s store.Store)
• func InitializeFromFlags(c context.Context, fl *Flags) error
• func Monitor(c context.Context) monitor.Monitor
• func RegisterCallback(f Callback)
• func RegisterCallbackIn(c context.Context, f Callback)
• func RegisterGlobalCallback(f Callback, metrics ...types.Metric)
• func RegisterGlobalCallbackIn(c context.Context, f Callback, metrics ...types.Metric)
• func ResetCumulativeMetrics(c context.Context)
• func SetStore(c context.Context, s store.Store)
• func Shutdown(c context.Context)
• func Store(c context.Context) store.Store
• func WithDummyInMemory(c context.Context) (context.Context, *monitor.Fake)
• func WithFakes(c context.Context) (context.Context, *store.Fake, *monitor.Fake)
• func WithState(c context.Context, s *State) context.Context
• type Callback
• type Flags
  • func NewFlags() Flags
  • func (fl *Flags) Register(f *flag.FlagSet)
• type FlushType
  • func (ft *FlushType) Set(v string) error
  • func (ft *FlushType) String() string
• type GlobalCallback
• type State
  • func GetState(c context.Context) *State
  • func NewState() *State
  • func (state *State) Flush(c context.Context, mon monitor.Monitor) error
  • func (state *State) ResetCumulativeMetrics(c context.Context)
  • func (state *State) RunGlobalCallbacks(c context.Context)
  • func (state *State) SetStore(s store.Store)

Constants

const (
	// FlushManual requires the user to flush manually.
	FlushManual = FlushType("manual")
	// FlushAuto automatically flushes at a periodic flush interval.
	FlushAuto = FlushType("auto")
)

Functions

func Flush

func Flush(c context.Context) error

Flush sends all the metrics that are registered in the application.

func Initialize

func Initialize(c context.Context, m monitor.Monitor, s store.Store)

Initialize configures the tsmon library with the given monitor and store.

func InitializeFromFlags

func InitializeFromFlags(c context.Context, fl *Flags) error

InitializeFromFlags configures the tsmon library from flag values.

This will set a Target (information about what's reporting metrics) and a Monitor (where to send the metrics to).

func Monitor

func Monitor(c context.Context) monitor.Monitor

Monitor returns the global monitor that sends metrics to monitoring endpoints. Defaults to a nil monitor, but changed by InitializeFromFlags.

func RegisterCallback

func RegisterCallback(f Callback)

RegisterCallback registers a callback function that will be run at metric collection time to set the values of one or more metrics. RegisterCallback should be called from an init() function in your module.

func RegisterCallbackIn

func RegisterCallbackIn(c context.Context, f Callback)

RegisterCallbackIn is like RegisterCallback but registers in a given context.

func RegisterGlobalCallback

func RegisterGlobalCallback(f Callback, metrics ...types.Metric)

RegisterGlobalCallback registers a callback function that will be run once per minute on *one* instance of your application. It is supported primarily on GAE.

You must specify the list of metrics that your callback affects - these metrics will be reset after flushing to ensure they are not sent by multiple instances.

RegisterGlobalCallback should be called from an init() function in your module.

func RegisterGlobalCallbackIn

func RegisterGlobalCallbackIn(c context.Context, f Callback, metrics ...types.Metric)

RegisterGlobalCallbackIn is like RegisterGlobalCallback but registers in a given context.

func ResetCumulativeMetrics

func ResetCumulativeMetrics(c context.Context)

ResetCumulativeMetrics resets only cumulative metrics.

func SetStore

func SetStore(c context.Context, s store.Store)

SetStore changes the global metric store. All metrics that were registered with the old store will be re-registered on the new store.

func Shutdown

func Shutdown(c context.Context)

Shutdown gracefully terminates the tsmon by doing the final flush and disabling auto flush (if it was enabled).

It resets Monitor and Store.

Logs error to standard logger. Does nothing if tsmon wasn't initialized.

func Store

func Store(c context.Context) store.Store

Store returns the global metric store that contains all the metric values for this process. Applications shouldn't need to access this directly - instead use the metric objects which provide type-safe accessors.

func WithDummyInMemory

func WithDummyInMemory(c context.Context) (context.Context, *monitor.Fake)

WithDummyInMemory returns a new context holding a new State with a new in- memory store and a fake monitor.

func WithFakes

func WithFakes(c context.Context) (context.Context, *store.Fake, *monitor.Fake)

WithFakes returns a new context holding a new State with a fake store and a fake monitor.

func WithState

func WithState(c context.Context, s *State) context.Context

WithState returns a new context holding the given State instance.

Types

type Callback

type Callback func(ctx context.Context)

Callback is a function that is run at metric collection time to set the values of one or more metrics. A callback can be registered with RegisterCallback.

type Flags

type Flags struct {
	ConfigFile    string
	Endpoint      string
	Credentials   string
	ActAs         string
	Flush         FlushType
	FlushInterval time.Duration

	Target target.Flags
}

Flags defines command line flags related to tsmon. Use NewFlags() to get a Flags struct with sensible default values.

func NewFlags

func NewFlags() Flags

NewFlags returns a Flags struct with sensible default values.

func (*Flags) Register

func (fl *Flags) Register(f *flag.FlagSet)

Register adds tsmon related flags to a FlagSet.

type FlushType

type FlushType string

FlushType is a flush type enumeration.

func (*FlushType) Set

func (ft *FlushType) Set(v string) error

Set implements flag.Value.

func (*FlushType) String

func (ft *FlushType) String() string

type GlobalCallback

type GlobalCallback struct {
	Callback
	Metrics []types.Metric
}

A GlobalCallback is a Callback with the list of metrics it affects, so those metrics can be reset after they are flushed.

type State

type State struct {
	S       store.Store
	M       monitor.Monitor
	Flusher *autoFlusher

	CallbacksMutex               sync.RWMutex
	Callbacks                    []Callback
	GlobalCallbacks              []GlobalCallback
	InvokeGlobalCallbacksOnFlush bool
}

State holds the configuration of the tsmon library. There is one global instance of State, but it can be overridden in a Context by tests.

func GetState

func GetState(c context.Context) *State

GetState returns the State instance held in the context (if set) or else returns the global state.

func NewState

func NewState() *State

NewState returns a new default State, configured with a nil Store and Monitor.

func (*State) Flush

func (state *State) Flush(c context.Context, mon monitor.Monitor) error

Flush sends all the metrics that are registered in the application.

Uses given monitor if not nil, or the state.M otherwise.

func (*State) ResetCumulativeMetrics

func (state *State) ResetCumulativeMetrics(c context.Context)

ResetCumulativeMetrics resets only cumulative metrics.

func (*State) RunGlobalCallbacks

func (state *State) RunGlobalCallbacks(c context.Context)

RunGlobalCallbacks runs all registered global callbacks that produce global metrics.

See RegisterGlobalCallback for more info.

func (*State) SetStore

func (state *State) SetStore(s store.Store)

SetStore changes the metric store. All metrics that were registered with the old store will be re-registered on the new store.