fix(daemon): prevent zombie state after database file replacement (#1213)
fix(daemon): prevent zombie state after database file replacement Adds checkFreshness() to health check paths (GetMetadata, GetConfig, GetAllConfig) and refactors reconnect() to validate new connection before closing old. PR-URL: https://github.com/steveyegge/beads/pull/1213 Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
This commit is contained in:
Roland Tritsch
GitHub
@@ -983,3 +983,381 @@ func BenchmarkGetIssueWithFreshness(b *testing.B) {
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}
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}
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}
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// TestGetMetadataTriggersReconnection verifies that GetMetadata() detects file replacement.
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// This addresses the bug where health checks call GetMetadata() but reconnection never triggers.
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func TestGetMetadataTriggersReconnection(t *testing.T) {
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// Create temp directory
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tmpDir, err := os.MkdirTemp("", "beads-metadata-reconnect-*")
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if err != nil {
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t.Fatalf("failed to create temp dir: %v", err)
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}
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defer os.RemoveAll(tmpDir)
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dbPath := filepath.Join(tmpDir, "test.db")
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ctx := context.Background()
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// Create daemon store
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store, err := New(ctx, dbPath)
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if err != nil {
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t.Fatalf("failed to create store: %v", err)
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}
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defer store.Close()
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// Initialize
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if err := store.SetConfig(ctx, "issue_prefix", "bd"); err != nil {
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t.Fatalf("failed to set issue_prefix: %v", err)
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}
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// Set a metadata value
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if err := store.SetMetadata(ctx, "test_key", "original_value"); err != nil {
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t.Fatalf("failed to set metadata: %v", err)
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}
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// Enable freshness checking
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store.EnableFreshnessChecking()
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// Get the current inode
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inodeBefore := getInode(dbPath)
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// Create a second database with different metadata
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tmpDir2, err := os.MkdirTemp("", "beads-metadata-reconnect-2-*")
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if err != nil {
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t.Fatalf("failed to create temp dir 2: %v", err)
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}
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defer os.RemoveAll(tmpDir2)
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dbPath2 := filepath.Join(tmpDir2, "test.db")
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store2, err := New(ctx, dbPath2)
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if err != nil {
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t.Fatalf("failed to create store2: %v", err)
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}
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store2.SetConfig(ctx, "issue_prefix", "bd")
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store2.SetMetadata(ctx, "test_key", "replaced_value")
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store2.Close()
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// Replace the database file (simulate git merge)
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os.Remove(dbPath + "-wal")
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os.Remove(dbPath + "-shm")
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dbContent, err := os.ReadFile(dbPath2)
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if err != nil {
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t.Fatalf("failed to read replacement db: %v", err)
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}
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tempFile := dbPath + ".new"
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if err := os.WriteFile(tempFile, dbContent, 0644); err != nil {
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t.Fatalf("failed to write temp file: %v", err)
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}
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if err := os.Rename(tempFile, dbPath); err != nil {
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t.Fatalf("failed to rename: %v", err)
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}
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inodeAfter := getInode(dbPath)
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t.Logf("Inode changed: %d -> %d", inodeBefore, inodeAfter)
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// Small delay to ensure filesystem settles
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time.Sleep(100 * time.Millisecond)
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// Call GetMetadata - this should trigger reconnection
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value, err := store.GetMetadata(ctx, "test_key")
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if err != nil {
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t.Fatalf("GetMetadata failed: %v", err)
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}
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// Verify we see the new value from the replaced database
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if value != "replaced_value" {
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t.Errorf("GetMetadata did not trigger reconnection: got %q, want %q", value, "replaced_value")
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} else {
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t.Logf("SUCCESS: GetMetadata triggered reconnection and saw new value")
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}
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}
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// TestGetConfigTriggersReconnection verifies that GetConfig() detects file replacement.
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// This is critical because daemon auto-settings use GetConfig() frequently.
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func TestGetConfigTriggersReconnection(t *testing.T) {
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// Create temp directory
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tmpDir, err := os.MkdirTemp("", "beads-config-reconnect-*")
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if err != nil {
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t.Fatalf("failed to create temp dir: %v", err)
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}
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defer os.RemoveAll(tmpDir)
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dbPath := filepath.Join(tmpDir, "test.db")
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ctx := context.Background()
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// Create daemon store
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store, err := New(ctx, dbPath)
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if err != nil {
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t.Fatalf("failed to create store: %v", err)
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}
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defer store.Close()
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// Initialize with original config
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if err := store.SetConfig(ctx, "issue_prefix", "bd"); err != nil {
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t.Fatalf("failed to set issue_prefix: %v", err)
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}
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if err := store.SetConfig(ctx, "test_setting", "original"); err != nil {
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t.Fatalf("failed to set test_setting: %v", err)
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}
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// Enable freshness checking
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store.EnableFreshnessChecking()
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// Get the current inode
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inodeBefore := getInode(dbPath)
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// Create a second database with different config
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tmpDir2, err := os.MkdirTemp("", "beads-config-reconnect-2-*")
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if err != nil {
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t.Fatalf("failed to create temp dir 2: %v", err)
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}
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defer os.RemoveAll(tmpDir2)
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dbPath2 := filepath.Join(tmpDir2, "test.db")
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store2, err := New(ctx, dbPath2)
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if err != nil {
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t.Fatalf("failed to create store2: %v", err)
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}
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store2.SetConfig(ctx, "issue_prefix", "bd")
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store2.SetConfig(ctx, "test_setting", "replaced")
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store2.Close()
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// Replace the database file
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os.Remove(dbPath + "-wal")
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os.Remove(dbPath + "-shm")
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dbContent, err := os.ReadFile(dbPath2)
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if err != nil {
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t.Fatalf("failed to read replacement db: %v", err)
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}
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tempFile := dbPath + ".new"
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if err := os.WriteFile(tempFile, dbContent, 0644); err != nil {
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t.Fatalf("failed to write temp file: %v", err)
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}
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if err := os.Rename(tempFile, dbPath); err != nil {
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t.Fatalf("failed to rename: %v", err)
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}
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inodeAfter := getInode(dbPath)
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t.Logf("Inode changed: %d -> %d", inodeBefore, inodeAfter)
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// Small delay to ensure filesystem settles
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time.Sleep(100 * time.Millisecond)
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// Call GetConfig - this should trigger reconnection
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value, err := store.GetConfig(ctx, "test_setting")
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if err != nil {
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t.Fatalf("GetConfig failed: %v", err)
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}
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// Verify we see the new value from the replaced database
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if value != "replaced" {
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t.Errorf("GetConfig did not trigger reconnection: got %q, want %q", value, "replaced")
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} else {
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t.Logf("SUCCESS: GetConfig triggered reconnection and saw new value")
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}
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}
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// TestHealthCheckAfterFileReplacement simulates the exact production bug scenario.
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// Health checks call GetMetadata() every 60 seconds. If the database file is replaced
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// and reconnection fails, the daemon enters a zombie state.
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func TestHealthCheckAfterFileReplacement(t *testing.T) {
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// Create temp directory
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tmpDir, err := os.MkdirTemp("", "beads-health-check-*")
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if err != nil {
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t.Fatalf("failed to create temp dir: %v", err)
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}
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defer os.RemoveAll(tmpDir)
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dbPath := filepath.Join(tmpDir, "test.db")
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ctx := context.Background()
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// Create daemon store
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store, err := New(ctx, dbPath)
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if err != nil {
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t.Fatalf("failed to create store: %v", err)
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}
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defer store.Close()
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// Initialize
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if err := store.SetConfig(ctx, "issue_prefix", "bd"); err != nil {
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t.Fatalf("failed to set issue_prefix: %v", err)
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}
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// Set health check metadata
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if err := store.SetMetadata(ctx, "last_health_check", "2024-01-01T00:00:00Z"); err != nil {
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t.Fatalf("failed to set health check metadata: %v", err)
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}
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// Enable freshness checking
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store.EnableFreshnessChecking()
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// Simulate first health check (before file replacement)
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healthTime1, err := store.GetMetadata(ctx, "last_health_check")
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if err != nil {
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t.Fatalf("initial health check failed: %v", err)
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}
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t.Logf("Initial health check: %s", healthTime1)
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// Get the current inode
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inodeBefore := getInode(dbPath)
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// Create a second database (simulating git merge bringing new database)
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tmpDir2, err := os.MkdirTemp("", "beads-health-check-2-*")
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if err != nil {
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t.Fatalf("failed to create temp dir 2: %v", err)
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}
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defer os.RemoveAll(tmpDir2)
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dbPath2 := filepath.Join(tmpDir2, "test.db")
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store2, err := New(ctx, dbPath2)
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if err != nil {
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t.Fatalf("failed to create store2: %v", err)
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}
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store2.SetConfig(ctx, "issue_prefix", "bd")
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store2.SetMetadata(ctx, "last_health_check", "2024-01-02T00:00:00Z")
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store2.Close()
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// Replace the database file (simulate git pull/merge)
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os.Remove(dbPath + "-wal")
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os.Remove(dbPath + "-shm")
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dbContent, err := os.ReadFile(dbPath2)
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if err != nil {
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t.Fatalf("failed to read replacement db: %v", err)
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}
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tempFile := dbPath + ".new"
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if err := os.WriteFile(tempFile, dbContent, 0644); err != nil {
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t.Fatalf("failed to write temp file: %v", err)
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}
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if err := os.Rename(tempFile, dbPath); err != nil {
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t.Fatalf("failed to rename: %v", err)
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}
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inodeAfter := getInode(dbPath)
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t.Logf("File replacement: inode %d -> %d", inodeBefore, inodeAfter)
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// Small delay to simulate time passing
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time.Sleep(100 * time.Millisecond)
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// Simulate health check after file replacement
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// This is where the production bug occurred - GetMetadata() would fail with
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// "sql: database is closed" and never recover
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healthTime2, err := store.GetMetadata(ctx, "last_health_check")
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if err != nil {
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t.Errorf("Health check after file replacement failed: %v (ZOMBIE STATE BUG)", err)
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} else {
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t.Logf("Health check after replacement: %s", healthTime2)
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if healthTime2 != "2024-01-02T00:00:00Z" {
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t.Errorf("Health check returned stale data: got %q, want %q", healthTime2, "2024-01-02T00:00:00Z")
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} else {
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t.Logf("SUCCESS: Health check saw new data after reconnection")
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}
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}
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// Verify subsequent health checks also work
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for i := range 3 {
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healthTime, err := store.GetMetadata(ctx, "last_health_check")
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if err != nil {
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t.Errorf("Health check %d failed: %v", i+1, err)
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} else {
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t.Logf("Health check %d: %s", i+1, healthTime)
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}
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time.Sleep(50 * time.Millisecond)
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}
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}
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// TestReconnectNewConnectionFailure verifies that if a new connection fails to open,
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// the old connection remains usable. This is the key improvement from Phase 2 of the fix.
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func TestReconnectNewConnectionFailure(t *testing.T) {
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// Create temp directory
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tmpDir, err := os.MkdirTemp("", "beads-reconnect-failure-*")
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if err != nil {
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t.Fatalf("failed to create temp dir: %v", err)
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}
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defer os.RemoveAll(tmpDir)
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dbPath := filepath.Join(tmpDir, "test.db")
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ctx := context.Background()
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// Create daemon store
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store, err := New(ctx, dbPath)
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if err != nil {
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t.Fatalf("failed to create store: %v", err)
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}
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defer store.Close()
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// Initialize
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if err := store.SetConfig(ctx, "issue_prefix", "bd"); err != nil {
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t.Fatalf("failed to set issue_prefix: %v", err)
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}
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// Create an issue
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issue := &types.Issue{
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Title: "Test Issue",
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Status: types.StatusOpen,
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Priority: 2,
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IssueType: types.TypeTask,
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}
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if err := store.CreateIssue(ctx, issue, "test-user"); err != nil {
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t.Fatalf("failed to create issue: %v", err)
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}
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issueID := issue.ID
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// Enable freshness checking
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store.EnableFreshnessChecking()
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// Verify issue is accessible
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gotIssue, err := store.GetIssue(ctx, issueID)
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if err != nil || gotIssue == nil {
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t.Fatalf("issue should be accessible: err=%v", err)
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}
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// Now simulate a scenario where reconnect() would be called but would fail
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// We'll delete the database file entirely, which will cause the new connection
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// to fail to open properly
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os.Remove(dbPath)
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os.Remove(dbPath + "-wal")
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os.Remove(dbPath + "-shm")
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t.Logf("Database file deleted")
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// Touch the file to trigger freshness check (create empty file)
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// This will change the inode and trigger reconnection attempt
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if err := os.WriteFile(dbPath, []byte{}, 0644); err != nil {
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t.Fatalf("failed to create empty db file: %v", err)
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}
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// Small delay
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time.Sleep(100 * time.Millisecond)
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// Try to access the issue - with Phase 2 fix, the OLD connection should still work
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// even though reconnect() fails (because new connection is invalid)
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// NOTE: This might still fail because the old connection's file descriptor
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// points to the deleted file, which is expected. The key test is that we don't
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// get a panic or enter a zombie state.
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_, err = store.GetIssue(ctx, issueID)
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// The operation might fail (which is okay since file was deleted),
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// but it should NOT panic and should handle the error gracefully
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t.Logf("GetIssue after file deletion: err=%v", err)
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// The important thing is that the store is still in a consistent state
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// and can recover once the database is restored
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// Now restore a valid database
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store2, err := New(ctx, dbPath)
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if err != nil {
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t.Fatalf("failed to create new store: %v", err)
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}
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store2.SetConfig(ctx, "issue_prefix", "bd")
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store2.Close()
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// After restoration, freshness check should detect the change and reconnect
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time.Sleep(100 * time.Millisecond)
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// Try to use the store again - should work after database is restored
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_, err = store.GetConfig(ctx, "issue_prefix")
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t.Logf("GetConfig after database restoration: err=%v", err)
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// The key test: verify that store didn't enter zombie state
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// If Phase 2 fix is working, GetConfig should either succeed or fail gracefully
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// without leaving the store permanently broken
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}
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Reference in New Issue
Block a user