[feat] - concurently scan the filesystem source (#2364)

* concurently scan the filesystem source

Co-authored-by: Miccah Castorina <m.castorina93@gmail.com>

* fix test

* update test

* remove return

* use error not info

* address comment

---------

Co-authored-by: Miccah Castorina <m.castorina93@gmail.com>

pkg/sources/filesystem/filesystem.go

@@ -10,6 +10,7 @@ import (
 	"github.com/go-errors/errors"
 	"github.com/go-logr/logr"
 	diskbufferreader "github.com/trufflesecurity/disk-buffer-reader"
+	"golang.org/x/sync/errgroup"
 	"google.golang.org/protobuf/proto"
 	"google.golang.org/protobuf/types/known/anypb"
 
@@ -26,13 +27,14 @@ import (
 const SourceType = sourcespb.SourceType_SOURCE_TYPE_FILESYSTEM
 
 type Source struct {
-	name     string
-	sourceId sources.SourceID
-	jobId    sources.JobID
-	verify   bool
-	paths    []string
-	log      logr.Logger
-	filter   *common.Filter
+	name        string
+	sourceId    sources.SourceID
+	jobId       sources.JobID
+	concurrency int
+	verify      bool
+	paths       []string
+	log         logr.Logger
+	filter      *common.Filter
 	sources.Progress
 	sources.CommonSourceUnitUnmarshaller
 }
@@ -57,9 +59,10 @@ func (s *Source) JobID() sources.JobID {
 }
 
 // Init returns an initialized Filesystem source.
-func (s *Source) Init(aCtx context.Context, name string, jobId sources.JobID, sourceId sources.SourceID, verify bool, connection *anypb.Any, _ int) error {
+func (s *Source) Init(aCtx context.Context, name string, jobId sources.JobID, sourceId sources.SourceID, verify bool, connection *anypb.Any, concurrency int) error {
 	s.log = aCtx.Logger()
 
+	s.concurrency = concurrency
 	s.name = name
 	s.sourceId = sourceId
 	s.jobId = jobId
@@ -102,16 +105,22 @@ func (s *Source) Chunks(ctx context.Context, chunksChan chan *sources.Chunk, _ .
 			err = s.scanFile(ctx, cleanPath, chunksChan)
 		}
 
-		if err != nil && err != io.EOF {
+		if err != nil && !errors.Is(err, io.EOF) {
 			logger.Info("error scanning filesystem", "error", err)
 		}
 	}
+
 	return nil
 }
 
 func (s *Source) scanDir(ctx context.Context, path string, chunksChan chan *sources.Chunk) error {
+	workerPool := new(errgroup.Group)
+	workerPool.SetLimit(s.concurrency)
+	defer func() { _ = workerPool.Wait() }()
+
 	return fs.WalkDir(os.DirFS(path), ".", func(relativePath string, d fs.DirEntry, err error) error {
 		if err != nil {
+			ctx.Logger().Error(err, "error walking directory")
 			return nil
 		}
 		fullPath := filepath.Join(path, relativePath)
@@ -126,9 +135,13 @@ func (s *Source) scanDir(ctx context.Context, path string, chunksChan chan *sour
 			return nil
 		}
 
-		if err = s.scanFile(ctx, fullPath, chunksChan); err != nil {
-			ctx.Logger().Info("error scanning file", "path", fullPath, "error", err)
-		}
+		workerPool.Go(func() error {
+			if err = s.scanFile(ctx, fullPath, chunksChan); err != nil {
+				ctx.Logger().Error(err, "error scanning file", "path", fullPath, "error", err)
+			}
+			return nil
+		})
+
 		return nil
 	})
 }

pkg/sources/filesystem/filesystem_test.go

@@ -53,6 +53,7 @@ func TestSource_Scan(t *testing.T) {
 			wantErr: false,
 		},
 	}
+
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			s := Source{}
@@ -71,16 +72,23 @@ func TestSource_Scan(t *testing.T) {
 			// TODO: this is kind of bad, if it errors right away we don't see it as a test failure.
 			// Debugging this usually requires setting a breakpoint on L78 and running test w/ debug.
 			go func() {
+				defer close(chunksCh)
 				err = s.Chunks(ctx, chunksCh)
 				if (err != nil) != tt.wantErr {
 					t.Errorf("Source.Chunks() error = %v, wantErr %v", err, tt.wantErr)
 					return
 				}
 			}()
-			gotChunk := <-chunksCh
-			if diff := pretty.Compare(gotChunk.SourceMetadata, tt.wantSourceMetadata); diff != "" {
-				t.Errorf("Source.Chunks() %s diff: (-got +want)\n%s", tt.name, diff)
+			var counter int
+			for chunk := range chunksCh {
+				if chunk.SourceMetadata.GetFilesystem().GetFile() == "filesystem.go" {
+					counter++
+					if diff := pretty.Compare(chunk.SourceMetadata, tt.wantSourceMetadata); diff != "" {
+						t.Errorf("Source.Chunks() %s diff: (-got +want)\n%s", tt.name, diff)
+					}
+				}
 			}
+			assert.Equal(t, 1, counter)
 		})
 	}
 }