rename to syft

syft/event/event.go

@@ -0,0 +1,9 @@
+package event
+
+import "github.com/wagoodman/go-partybus"
+
+const (
+	AppUpdateAvailable partybus.EventType = "app-update-available"
+	CatalogerStarted   partybus.EventType = "cataloger-started-event"
+	CatalogerFinished  partybus.EventType = "cataloger-finished-event"
+)

syft/event/parsers/parsers.go

@@ -0,0 +1,74 @@
+package parsers
+
+import (
+	"fmt"
+
+	"github.com/anchore/syft/syft/cataloger"
+	"github.com/anchore/syft/syft/event"
+	"github.com/anchore/syft/syft/presenter"
+	"github.com/wagoodman/go-partybus"
+)
+
+type ErrBadPayload struct {
+	Type  partybus.EventType
+	Field string
+	Value interface{}
+}
+
+func (e *ErrBadPayload) Error() string {
+	return fmt.Sprintf("event='%s' has bad event payload field='%v': '%+v'", string(e.Type), e.Field, e.Value)
+}
+
+func newPayloadErr(t partybus.EventType, field string, value interface{}) error {
+	return &ErrBadPayload{
+		Type:  t,
+		Field: field,
+		Value: value,
+	}
+}
+
+func checkEventType(actual, expected partybus.EventType) error {
+	if actual != expected {
+		return newPayloadErr(expected, "Type", actual)
+	}
+	return nil
+}
+
+func ParseCatalogerStarted(e partybus.Event) (*cataloger.Monitor, error) {
+	if err := checkEventType(e.Type, event.CatalogerStarted); err != nil {
+		return nil, err
+	}
+
+	monitor, ok := e.Value.(cataloger.Monitor)
+	if !ok {
+		return nil, newPayloadErr(e.Type, "Value", e.Value)
+	}
+
+	return &monitor, nil
+}
+
+func ParseCatalogerFinished(e partybus.Event) (presenter.Presenter, error) {
+	if err := checkEventType(e.Type, event.CatalogerFinished); err != nil {
+		return nil, err
+	}
+
+	pres, ok := e.Value.(presenter.Presenter)
+	if !ok {
+		return nil, newPayloadErr(e.Type, "Value", e.Value)
+	}
+
+	return pres, nil
+}
+
+func ParseAppUpdateAvailable(e partybus.Event) (string, error) {
+	if err := checkEventType(e.Type, event.AppUpdateAvailable); err != nil {
+		return "", err
+	}
+
+	newVersion, ok := e.Value.(string)
+	if !ok {
+		return "", newPayloadErr(e.Type, "Value", e.Value)
+	}
+
+	return newVersion, nil
+}