Update GitHub enumeration to report unique filtered values (#3292)

The reported values should match the values populated in s.repos.

pkg/sources/github/github.go

@@ -331,7 +331,14 @@ func (s *Source) Chunks(ctx context.Context, chunksChan chan *sources.Chunk, tar
 	githubSecondsSpentRateLimited.WithLabelValues(s.name).Set(0)
 	githubReposScanned.WithLabelValues(s.name).Set(0)
 
-	err := s.enumerate(ctx)
+	// We don't care about handling enumerated values as they happen during
+	// the normal Chunks flow because we enumerate and scan in two steps.
+	noopReporter := sources.VisitorReporter{
+		VisitUnit: func(context.Context, sources.SourceUnit) error {
+			return nil
+		},
+	}
+	err := s.enumerate(ctx, noopReporter)
 	if err != nil {
 		return fmt.Errorf("error enumerating: %w", err)
 	}
@@ -339,30 +346,52 @@ func (s *Source) Chunks(ctx context.Context, chunksChan chan *sources.Chunk, tar
 	return s.scan(ctx, chunksReporter)
 }
 
-func (s *Source) enumerate(ctx context.Context) error {
+// enumerate enumerates the GitHub source based on authentication method and
-	// Create a reporter that does nothing for now.
+// user configuration. It populates s.filteredRepoCache, s.repoInfoCache,
-	noopReporter := sources.VisitorReporter{
+// s.memberCache, s.totalRepoSize, s.orgsCache, and s.repos. Additionally,
+// repositories and gists are reported to the provided UnitReporter.
+func (s *Source) enumerate(ctx context.Context, reporter sources.UnitReporter) error {
+	seenUnits := make(map[sources.SourceUnit]struct{})
+	// Wrapper reporter to deduplicate and filter found units.
+	dedupeReporter := sources.VisitorReporter{
 		VisitUnit: func(ctx context.Context, su sources.SourceUnit) error {
-			return nil
+			// Only report units that passed the user configured filter.
+			name := su.Display()
+			if !s.filteredRepoCache.Exists(name) {
+				return ctx.Err()
+			}
+			// Only report a unit once.
+			if _, ok := seenUnits[su]; ok {
+				return ctx.Err()
+			}
+			seenUnits[su] = struct{}{}
+			return reporter.UnitOk(ctx, su)
 		},
+		VisitErr: reporter.UnitErr,
 	}
+	// Report any values that were already configured.
+	for _, name := range s.filteredRepoCache.Keys() {
+		url, _ := s.filteredRepoCache.Get(name)
+		_ = dedupeReporter.UnitOk(ctx, RepoUnit{name: name, url: url})
+	}
+
 	// I'm not wild about switching on the connector type here (as opposed to dispatching to the connector itself) but
 	// this felt like a compromise that allowed me to isolate connection logic without rewriting the entire source.
 	switch c := s.connector.(type) {
 	case *appConnector:
-		if err := s.enumerateWithApp(ctx, c.InstallationClient(), noopReporter); err != nil {
+		if err := s.enumerateWithApp(ctx, c.InstallationClient(), dedupeReporter); err != nil {
 			return err
 		}
 	case *basicAuthConnector:
-		if err := s.enumerateBasicAuth(ctx, noopReporter); err != nil {
+		if err := s.enumerateBasicAuth(ctx, dedupeReporter); err != nil {
 			return err
 		}
 	case *tokenConnector:
-		if err := s.enumerateWithToken(ctx, c.IsGithubEnterprise(), noopReporter); err != nil {
+		if err := s.enumerateWithToken(ctx, c.IsGithubEnterprise(), dedupeReporter); err != nil {
 			return err
 		}
 	case *unauthenticatedConnector:
-		s.enumerateUnauthenticated(ctx, noopReporter)
+		s.enumerateUnauthenticated(ctx, dedupeReporter)
 	}
 	s.repos = make([]string, 0, s.filteredRepoCache.Count())
 

pkg/sources/github/github_test.go

@@ -11,6 +11,7 @@ import (
 	"net/http"
 	"net/url"
 	"reflect"
+	"slices"
 	"strconv"
 	"testing"
 	"time"
@@ -566,8 +567,18 @@ func TestEnumerate(t *testing.T) {
 	s.cacheRepoInfo(repo)
 	s.filteredRepoCache.Set(repo.GetFullName(), repo.GetCloneURL())
 
+	var reportedRepos []string
+	reporter := sources.VisitorReporter{
+		VisitUnit: func(ctx context.Context, su sources.SourceUnit) error {
+			url, _ := su.SourceUnitID()
+			reportedRepos = append(reportedRepos, url)
+			return nil
+		},
+	}
+
 	// Act
-	err := s.enumerate(context.Background())
+	err := s.enumerate(context.Background(), reporter)
+	slices.Sort(reportedRepos)
 
 	// Assert
 	assert.Nil(t, err)
@@ -576,6 +587,8 @@ func TestEnumerate(t *testing.T) {
 	assert.True(t, s.filteredRepoCache.Exists("super-secret-user/super-secret-repo"))
 	assert.True(t, s.filteredRepoCache.Exists("cached-user/cached-repo"))
 	assert.True(t, s.filteredRepoCache.Exists("2801a2b0523099d0614a951579d99ba9"))
+	assert.Equal(t, 3, len(s.repos))
+	assert.Equal(t, s.repos, reportedRepos)
 	// Enumeration cached all repos.
 	assert.Equal(t, 3, len(s.repoInfoCache.cache))
 	_, ok := s.repoInfoCache.get("https://github.com/super-secret-user/super-secret-repo.git")
@@ -640,7 +653,7 @@ func BenchmarkEnumerate(b *testing.B) {
 		setupMocks(b)
 
 		b.StartTimer()
-		_ = s.enumerate(context.Background())
+		_ = s.enumerate(context.Background(), noopReporter())
 	}
 }