events

package

v0.15.1 Latest Latest Go to latest Published: Oct 25, 2026 License: AGPL-3.0 Imports: 1 Imported by: 0

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Repository

github.com/trypando/pando

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Documentation ¶

Overview ¶

Package events is the catalog of things Pando tells subscribers about (R-364, issue #50, design 11).

One list, in code, of every event a subscription can name: its stable name, whether it is about one app or the whole installation, where it comes from, and the fields it carries. The API serves it, `make reference` writes docs/events.md from it, and the console's subscription form offers it, so none of those can describe an event the others do not.

This package is a leaf: it imports nothing from core, so the state package, the audit writer and the delivery engine can all depend on it.

Index ¶

Constants
func Match(pattern, name string) bool
func MatchAny(patterns []string, name string) bool
func ValidPattern(p string) bool
type Def
- func (d Def) Data(detail map[string]any) map[string]any
type Field
type Scope
type Source

Constants ¶

View Source

const (
	AppStateChanged     = "app.state_changed"
	DeploySucceeded     = "deploy.succeeded"
	DeployFailed        = "deploy.failed"
	BackupCreated       = "backup.created"
	BackupFailed        = "backup.failed"
	AdapterUnhealthy    = "adapter.unhealthy"
	AdapterRecovered    = "adapter.recovered"
	SubscriptionTest    = "subscription.test"
	SubscriptionDisable = "subscription.disabled"
)

Event names core writes directly, and the ones a trigger writes, as constants so a typo is a compile error rather than an event nobody can subscribe to.

Variables ¶

This section is empty.

Functions ¶

func Match ¶

func Match(pattern, name string) bool

Match reports whether pattern matches the event name.

func MatchAny ¶

func MatchAny(patterns []string, name string) bool

MatchAny reports whether any pattern matches.

func ValidPattern ¶

func ValidPattern(p string) bool

ValidPattern reports whether p names an event or matches at least one.

A pattern is an event name, a prefix ending in ".*" (deploy.*), or "*". A pattern that matches nothing is refused rather than stored: a subscription to "deploy.fialed" would be a subscription that never fires, which is the worst way to find out about a typo.

Types ¶

type Def ¶

type Def struct {
	Name    string  `json:"name"`
	Scope   Scope   `json:"scope"`
	Source  Source  `json:"source"`
	Summary string  `json:"summary"`
	Fields  []Field `json:"fields"`

	// Actions are the audit actions this event is copied from, when Source
	// is SourceAudit.
	Actions []string `json:"-"`
}

Def is one catalogued event.

func Catalog ¶

func Catalog() []Def

Catalog returns every event, in documentation order. The slice is a copy.

func ForAction ¶

func ForAction(action string) (Def, bool)

ForAction returns the event an audit action is copied to, if any.

func Lookup ¶

func Lookup(name string) (Def, bool)

Lookup returns one event by name.

func (Def) Data ¶

func (d Def) Data(detail map[string]any) map[string]any

Data selects an event's fields from an audit event's detail.

Only catalogued fields are copied, so an event's shape is what the catalog says it is, and a field somebody later adds to an audit detail does not reach a subscriber's endpoint without first being written down here.

type Field ¶

type Field struct {
	Name        string `json:"name"`
	Description string `json:"description"`
}

Field is one entry in an event's data.

type Scope ¶

type Scope string

Scope is what an event is about.

const (
	// ScopeApp events name one app, and reach subscriptions on that app as
	// well as install-wide ones.
	ScopeApp Scope = "app"
	// ScopeInstall events are about the installation, and reach install-wide
	// subscriptions only.
	ScopeInstall Scope = "install"
)

type Source ¶

type Source string

Source is where Pando learns an event happened.

const (
	// SourceAudit: copied from the audit log as the audit row is written, in
	// the same transaction.
	SourceAudit Source = "audit"
	// SourceState: written by a database trigger when a row changes.
	SourceState Source = "state"
	// SourceCore: written by core directly.
	SourceCore Source = "core"
)

Source Files ¶

View all Source files

catalog.go

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