alerter

Documentation

Overview

Package alerter implements an alerter to send sms/email messages on anomalies found.

Runing Model

The consumer-producer model, banshee will start some alerting workers to receive detected metrics and execute the sender command, the reason is mainly to prevent high CPU usage on the os system command calls.

                    +-> alerter worker1
Detector -> Channel --> alerter worker2
                    +-> alerter worker3

Alerter Command

Alerter command is the system command (a python script or a shell script etc.) to send messages to users.

The command should receive a JSON-string as the first argument:

$ ./alerter-command <JSON-string>

Where the JSON-string contains the project, user and metric information to alert, for example:

{
	"project": {"name": "note"},
	"user": {
		"name": "jack",
		"email": "jack@gmail.com",
		"enableEmail": true,
		"phone": "18735121212",
		"enablePhone": true
	},
	"metric": {
		"name": "timer.mean_90.note.get",
		"score": 1.2,
		"stamp": 1452494901,
		"value": 2000
	},
	"rule": {
		"pattern": "timer.mean_90.note.*",
		"comment": "service note get api"
	}
}

And the alerter command should do the sending message job, for example:

// Parse the first command line argument
data = loadJSON(argv[1])

// Send email.
if data['user']['enableEmail'] then
	// Implement sendEmail..
	sendEmail(data['user']['email'], data['metric'])
endif

// Send sms.
if data['user']['enablePhone'] then
	// Implement sendPhone..
endif

Alert To Slack Or HipChat

We can also send alerting messages to some chat services like slack or hipchat, take the slack as an example:

1. Add an universal user named slack-bot on the web panel.

2. Add logic codes like followings to the command:

if data['user']['name'] == 'slack-bot' then
	// Post to slack with alerting message if the user is slack-bot
	requestData = {'username': 'banshee-bot', text: packMessage(data)}
	http.POST("https://hooks.slack.com/services/<hook-for-the-channel>", data=requestData)
endif

Slack incoming webhooks: https://api.slack.com/incoming-webhooks

Index

• type Alerter
  • func New(cfg *config.Config, db *storage.DB) *Alerter
  • func (al *Alerter) Start()

Types

type Alerter

type Alerter struct {
	In chan *models.Event
	// contains filtered or unexported fields
}

Alerter is the alert service abstraction.

func New

func New(cfg *config.Config, db *storage.DB) *Alerter

New creates a new Alerter.

func (*Alerter) Start

func (al *Alerter) Start()

Start workers to wait for events.