feat: k8s parallel processing (#3693)

Signed-off-by: chenk <hen.keinan@gmail.com>
Co-authored-by: knqyf263 <knqyf263@gmail.com>

pkg/flag/kubernetes_flags.go

@@ -1,10 +1,13 @@
 package flag
 
 import (
-	"fmt"
 	"strconv"
+
+	"fmt"
 	"strings"
 
+	"golang.org/x/xerrors"
+
 	"github.com/samber/lo"
 	corev1 "k8s.io/api/core/v1"
 )
@@ -47,6 +50,12 @@ var (
 		Value:      "",
 		Usage:      "specify k8s version to validate outdated api by it (example: 1.21.0)",
 	}
+	ParallelFlag = Flag{
+		Name:       "parallel",
+		ConfigName: "kubernetes.parallel",
+		Value:      5,
+		Usage:      "number (between 1-20) of goroutines enabled for parallel scanning",
+	}
 	TolerationsFlag = Flag{
 		Name:       "tolerations",
 		ConfigName: "kubernetes.tolerations",
@@ -61,6 +70,7 @@ type K8sFlagGroup struct {
 	KubeConfig     *Flag
 	Components     *Flag
 	K8sVersion     *Flag
+	Parallel       *Flag
 	Tolerations    *Flag
 }
 
@@ -70,6 +80,7 @@ type K8sOptions struct {
 	KubeConfig     string
 	Components     []string
 	K8sVersion     string
+	Parallel       int
 	Tolerations    []corev1.Toleration
 }
 
@@ -80,6 +91,7 @@ func NewK8sFlagGroup() *K8sFlagGroup {
 		KubeConfig:     &KubeConfigFlag,
 		Components:     &ComponentsFlag,
 		K8sVersion:     &K8sVersionFlag,
+		Parallel:       &ParallelFlag,
 		Tolerations:    &TolerationsFlag,
 	}
 }
@@ -95,6 +107,7 @@ func (f *K8sFlagGroup) Flags() []*Flag {
 		f.KubeConfig,
 		f.Components,
 		f.K8sVersion,
+		f.Parallel,
 		f.Tolerations,
 	}
 }
@@ -104,12 +117,21 @@ func (f *K8sFlagGroup) ToOptions() (K8sOptions, error) {
 	if err != nil {
 		return K8sOptions{}, err
 	}
+	var parallel int
+	if f.Parallel != nil {
+		parallel = getInt(f.Parallel)
+		// check parallel flag is a valid number between 1-20
+		if parallel < 1 || parallel > 20 {
+			return K8sOptions{}, xerrors.Errorf("unable to parse parallel value, please ensure that the value entered is a valid number between 1-20.")
+		}
+	}
 	return K8sOptions{
 		ClusterContext: getString(f.ClusterContext),
 		Namespace:      getString(f.Namespace),
 		KubeConfig:     getString(f.KubeConfig),
 		Components:     getStringSlice(f.Components),
 		K8sVersion:     getString(f.K8sVersion),
+		Parallel:       parallel,
 		Tolerations:    tolerations,
 	}, nil
 }

pkg/k8s/scanner/scanner.go

@@ -2,9 +2,7 @@ package scanner
 
 import (
 	"context"
-	"io"
 
-	"github.com/cheggaaa/pb/v3"
 	"golang.org/x/xerrors"
 
 	"github.com/aquasecurity/trivy-kubernetes/pkg/artifacts"
@@ -12,6 +10,7 @@ import (
 	"github.com/aquasecurity/trivy/pkg/flag"
 	"github.com/aquasecurity/trivy/pkg/k8s/report"
 	"github.com/aquasecurity/trivy/pkg/log"
+	"github.com/aquasecurity/trivy/pkg/parallel"
 	"github.com/aquasecurity/trivy/pkg/scanner/local"
 	"github.com/aquasecurity/trivy/pkg/types"
 )
@@ -30,15 +29,7 @@ func NewScanner(cluster string, runner cmd.Runner, opts flag.Options) *Scanner {
 	}
 }
 
-func (s *Scanner) Scan(ctx context.Context, artifacts []*artifacts.Artifact) (report.Report, error) {
-	// progress bar
-	bar := pb.StartNew(len(artifacts))
-	if s.opts.NoProgress {
-		bar.SetWriter(io.Discard)
-	}
-	defer bar.Finish()
-
-	var vulns, misconfigs []report.Resource
+func (s *Scanner) Scan(ctx context.Context, artifactsData []*artifacts.Artifact) (report.Report, error) {
 
 	// disable logs before scanning
 	err := log.InitLogger(s.opts.Debug, true)
@@ -56,27 +47,42 @@ func (s *Scanner) Scan(ctx context.Context, artifacts []*artifacts.Artifact) (re
 			log.Fatal(xerrors.Errorf("can't enable logger error: %w", err))
 		}
 	}()
+	var vulns, misconfigs []report.Resource
 
-	// Loops once over all artifacts, and execute scanners as necessary. Not every artifacts has an image,
-	// so image scanner is not always executed.
-	for _, artifact := range artifacts {
-		bar.Increment()
+	type scanResult struct {
+		vulns     []report.Resource
+		misconfig report.Resource
+	}
 
+	onItem := func(artifact *artifacts.Artifact) (scanResult, error) {
+		scanResults := scanResult{}
 		if s.opts.Scanners.AnyEnabled(types.VulnerabilityScanner, types.SecretScanner) {
-			resources, err := s.scanVulns(ctx, artifact)
+			vulns, err := s.scanVulns(ctx, artifact)
 			if err != nil {
-				return report.Report{}, xerrors.Errorf("scanning vulnerabilities error: %w", err)
+				return scanResult{}, xerrors.Errorf("scanning vulnerabilities error: %w", err)
 			}
-			vulns = append(vulns, resources...)
+			scanResults.vulns = vulns
+		}
+		if local.ShouldScanMisconfigOrRbac(s.opts.Scanners) {
+			misconfig, err := s.scanMisconfigs(ctx, artifact)
+			if err != nil {
+				return scanResult{}, xerrors.Errorf("scanning misconfigurations error: %w", err)
+			}
+			scanResults.misconfig = misconfig
+		}
+		return scanResults, nil
 	}
 
-		if local.ShouldScanMisconfigOrRbac(s.opts.Scanners) {
-			resource, err := s.scanMisconfigs(ctx, artifact)
+	onResult := func(result scanResult) error {
+		vulns = append(vulns, result.vulns...)
+		misconfigs = append(misconfigs, result.misconfig)
+		return nil
+	}
+
+	p := parallel.NewPipeline(s.opts.Parallel, true, artifactsData, onItem, onResult)
+	err = p.Do(ctx)
 	if err != nil {
-				return report.Report{}, xerrors.Errorf("scanning misconfigurations error: %w", err)
-			}
-			misconfigs = append(misconfigs, resource)
-		}
+		return report.Report{}, err
 	}
 
 	return report.Report{