Add support for multiple output files in different formats (#732)

syft/event/event.go

@@ -26,8 +26,8 @@ const (
 	// FileIndexingStarted is a partybus event that occurs when the directory resolver begins indexing a filesystem
 	FileIndexingStarted partybus.EventType = "syft-file-indexing-started-event"
 
-	// PresenterReady is a partybus event that occurs when an analysis result is ready for final presentation
-	PresenterReady partybus.EventType = "syft-presenter-ready-event"
+	// Exit is a partybus event that occurs when an analysis result is ready for final presentation
+	Exit partybus.EventType = "syft-exit-event"
 
 	// ImportStarted is a partybus event that occurs when an SBOM upload process has begun
 	ImportStarted partybus.EventType = "syft-import-started-event"

syft/event/parsers/parsers.go

@@ -6,7 +6,6 @@ package parsers
 import (
 	"fmt"
 
-	"github.com/anchore/go-presenter"
 	"github.com/anchore/syft/syft/event"
 	"github.com/anchore/syft/syft/file"
 	"github.com/anchore/syft/syft/pkg/cataloger"
@@ -109,17 +108,17 @@ func ParseFileIndexingStarted(e partybus.Event) (string, progress.StagedProgress
 	return path, prog, nil
 }
 
-func ParsePresenterReady(e partybus.Event) (presenter.Presenter, error) {
-	if err := checkEventType(e.Type, event.PresenterReady); err != nil {
+func ParseExit(e partybus.Event) (func() error, error) {
+	if err := checkEventType(e.Type, event.Exit); err != nil {
 		return nil, err
 	}
 
-	pres, ok := e.Value.(presenter.Presenter)
+	fn, ok := e.Value.(func() error)
 	if !ok {
 		return nil, newPayloadErr(e.Type, "Value", e.Value)
 	}
 
-	return pres, nil
+	return fn, nil
 }
 
 func ParseAppUpdateAvailable(e partybus.Event) (string, error) {

syft/format/format.go

@@ -50,10 +50,3 @@ func (f Format) Validate(reader io.Reader) error {
 
 	return f.validator(reader)
 }
-
-func (f Format) Presenter(s sbom.SBOM) *Presenter {
-	if f.encoder == nil {
-		return nil
-	}
-	return NewPresenter(f.encoder, s)
-}

syft/format/presenter.go

@@ -1,23 +0,0 @@
-package format
-
-import (
-	"io"
-
-	"github.com/anchore/syft/syft/sbom"
-)
-
-type Presenter struct {
-	sbom    sbom.SBOM
-	encoder Encoder
-}
-
-func NewPresenter(encoder Encoder, s sbom.SBOM) *Presenter {
-	return &Presenter{
-		sbom:    s,
-		encoder: encoder,
-	}
-}
-
-func (pres *Presenter) Present(output io.Writer) error {
-	return pres.encoder(output, pres.sbom)
-}

syft/lib.go

@@ -5,7 +5,7 @@ Here is what the main execution path for syft does:
 
 	1. Parse a user image string to get a stereoscope image.Source object
 	2. Invoke all catalogers to catalog the image, adding discovered packages to a single catalog object
-	3. Invoke a single presenter to show the contents of the catalog
+	3. Invoke one or more encoders to output contents of the catalog
 
 A Source object encapsulates the image object to be cataloged and the user options (catalog all layers vs. squashed layer),
 providing a way to inspect paths and file content within the image. The Source object, not the image object, is used

syft/sbom/writer.go

@@ -0,0 +1,13 @@
+package sbom
+
+import "io"
+
+// Writer an interface to write SBOMs
+type Writer interface {
+	// Write writes the provided SBOM
+	Write(SBOM) error
+
+	// Closer a resource cleanup hook which will be called after SBOM
+	// is written or if an error occurs before Write is called
+	io.Closer
+}