alert

Documentation

Overview

Alert provides a framework for tracking events in a publish subscribe system. Events are published to topics and handlers consume the events from the topics.

Index

• func PatternMatch(pattern, id string) bool
• type Data
• type Event
  • func (e Event) AlertData() Data
  • func (e Event) PreviousState() EventState
  • func (e Event) TemplateData() TemplateData
• type EventData
• type EventState
• type Handler
• type Level
  • func ParseLevel(s string) (l Level, err error)
  • func (l Level) MarshalText() ([]byte, error)
  • func (l Level) String() string
  • func (l *Level) UnmarshalText(text []byte) error
• type TemplateData
• type Topic
  • func (t *Topic) Collected() int64
  • func (t *Topic) EventState(event string) (EventState, bool)
  • func (t *Topic) EventStates(minLevel Level) map[string]EventState
  • func (t *Topic) ID() string
  • func (t *Topic) MaxLevel() Level
  • func (t *Topic) State() TopicState
• type TopicState
• type Topics
  • func NewTopics(l *log.Logger) *Topics
  • func (s *Topics) Close() error
  • func (s *Topics) Collect(event Event) error
  • func (s *Topics) DeleteTopic(topic string)
  • func (s *Topics) DeregisterHandler(topic string, h Handler)
  • func (s *Topics) EventState(topic, event string) (EventState, bool)
  • func (s *Topics) Open() error
  • func (s *Topics) RegisterHandler(topic string, h Handler)
  • func (s *Topics) ReplaceHandler(topic string, oldH, newH Handler)
  • func (s *Topics) RestoreTopic(id string, eventStates map[string]EventState)
  • func (s *Topics) Topic(id string) (*Topic, bool)
  • func (s *Topics) TopicState(pattern string, minLevel Level) map[string]TopicState
  • func (s *Topics) UpdateEvent(id string, event EventState)

Functions

func PatternMatch

func PatternMatch(pattern, id string) bool

Types

type Data

type Data struct {
	ID       string        `json:"id"`
	Message  string        `json:"message"`
	Details  string        `json:"details"`
	Time     time.Time     `json:"time"`
	Duration time.Duration `json:"duration"`
	Level    Level         `json:"level"`
	Data     models.Result `json:"data"`
}

Data is a structure that contains relevant data about an alert event. The structure is intended to be JSON encoded, providing a consistent data format.

type Event

type Event struct {
	Topic      string
	State      EventState
	Data       EventData
	NoExternal bool
	// contains filtered or unexported fields
}

func (Event) AlertData

func (e Event) AlertData() Data

func (Event) PreviousState

func (e Event) PreviousState() EventState

func (Event) TemplateData

func (e Event) TemplateData() TemplateData

type EventData

type EventData struct {
	// Measurement name
	Name string

	// TaskName is the name of the task that generated this event.
	TaskName string

	// Concatenation of all group-by tags of the form [key=value,]+.
	// If not groupBy is performed equal to literal 'nil'
	Group string

	// Map of tags
	Tags map[string]string

	// Fields of alerting data point.
	Fields map[string]interface{}

	Result models.Result
}

type EventState

type EventState struct {
	ID       string
	Message  string
	Details  string
	Time     time.Time
	Duration time.Duration
	Level    Level
}

type Handler

type Handler interface {
	// Handle is responsible for taking action on the event.
	Handle(event Event)
}

type Level

type Level int

const (
	OK Level = iota
	Info
	Warning
	Critical
)

func ParseLevel

func ParseLevel(s string) (l Level, err error)

func (Level) MarshalText

func (l Level) MarshalText() ([]byte, error)

func (Level) String

func (l Level) String() string

func (*Level) UnmarshalText

func (l *Level) UnmarshalText(text []byte) error

type TemplateData

type TemplateData struct {
	// The ID of the alert.
	ID string

	// The Message of the Alert
	Message string

	// Alert Level, one of: INFO, WARNING, CRITICAL.
	Level string

	// Time the event occurred.
	Time time.Time

	// Duration of the event
	Duration time.Duration

	// Measurement name
	Name string

	// Task name
	TaskName string

	// Concatenation of all group-by tags of the form [key=value,]+.
	// If not groupBy is performed equal to literal 'nil'
	Group string

	// Map of tags
	Tags map[string]string

	// Fields of alerting data point.
	Fields map[string]interface{}
}

TemplateData is a structure containing all information available to use in templates for an Event.

type Topic

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

func (*Topic) Collected

func (t *Topic) Collected() int64

func (*Topic) EventState

func (t *Topic) EventState(event string) (EventState, bool)

func (*Topic) EventStates

func (t *Topic) EventStates(minLevel Level) map[string]EventState

func (*Topic) ID

func (t *Topic) ID() string

func (*Topic) MaxLevel

func (t *Topic) MaxLevel() Level

func (*Topic) State

func (t *Topic) State() TopicState

type TopicState

type TopicState struct {
	Level     Level
	Collected int64
}

type Topics

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

func NewTopics

func NewTopics(l *log.Logger) *Topics

func (*Topics) Close

func (s *Topics) Close() error

func (*Topics) Collect

func (s *Topics) Collect(event Event) error

Collect collects an event and handles the event.

func (*Topics) DeleteTopic

func (s *Topics) DeleteTopic(topic string)

func (*Topics) DeregisterHandler

func (s *Topics) DeregisterHandler(topic string, h Handler)

func (*Topics) EventState

func (s *Topics) EventState(topic, event string) (EventState, bool)

func (*Topics) Open

func (s *Topics) Open() error

func (*Topics) RegisterHandler

func (s *Topics) RegisterHandler(topic string, h Handler)

func (*Topics) ReplaceHandler

func (s *Topics) ReplaceHandler(topic string, oldH, newH Handler)

func (*Topics) RestoreTopic

func (s *Topics) RestoreTopic(id string, eventStates map[string]EventState)

func (*Topics) Topic

func (s *Topics) Topic(id string) (*Topic, bool)

func (*Topics) TopicState

func (s *Topics) TopicState(pattern string, minLevel Level) map[string]TopicState

TopicState returns the max alert level for each topic matching 'pattern', not returning any topics with max alert levels less severe than 'minLevel'

func (*Topics) UpdateEvent

func (s *Topics) UpdateEvent(id string, event EventState)