add debug logging about bstore db schema upgrades

bstore was updated to v0.0.6 to add this logging.
this simplifies some of the db-handling code in mtastsdb,tlsrptdb,dmarcdb. we
now call the package-level Init() and Close() in all tests properly.

dmarcdb/dmarcdb.go

@@ -11,6 +11,15 @@
 package dmarcdb
 
 import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/mjl-/bstore"
+
+	"github.com/mjl-/mox/mlog"
 	"github.com/mjl-/mox/mox-"
 )
 
@@ -19,11 +28,49 @@ import (
 // The incoming reports and evaluations for outgoing reports are in separate
 // databases for simpler file-based handling of the databases.
 func Init() error {
-	if _, err := reportsDB(mox.Shutdown); err != nil {
-		return err
+	if ReportsDB != nil || EvalDB != nil {
+		return fmt.Errorf("already initialized")
 	}
-	if _, err := evalDB(mox.Shutdown); err != nil {
-		return err
+
+	log := mlog.New("dmarcdb", nil)
+	var err error
+
+	ReportsDB, err = openReportsDB(mox.Shutdown, log)
+	if err != nil {
+		return fmt.Errorf("open reports db: %v", err)
 	}
+
+	EvalDB, err = openEvalDB(mox.Shutdown, log)
+	if err != nil {
+		return fmt.Errorf("open eval db: %v", err)
+	}
+
 	return nil
 }
+
+func Close() error {
+	if err := ReportsDB.Close(); err != nil {
+		return fmt.Errorf("closing reports db: %w", err)
+	}
+	ReportsDB = nil
+
+	if err := EvalDB.Close(); err != nil {
+		return fmt.Errorf("closing eval db: %w", err)
+	}
+	EvalDB = nil
+	return nil
+}
+
+func openReportsDB(ctx context.Context, log mlog.Log) (*bstore.DB, error) {
+	p := mox.DataDirPath("dmarcrpt.db")
+	os.MkdirAll(filepath.Dir(p), 0770)
+	opts := bstore.Options{Timeout: 5 * time.Second, Perm: 0660, RegisterLogger: log.Logger}
+	return bstore.Open(ctx, p, &opts, ReportsDBTypes...)
+}
+
+func openEvalDB(ctx context.Context, log mlog.Log) (*bstore.DB, error) {
+	p := mox.DataDirPath("dmarceval.db")
+	os.MkdirAll(filepath.Dir(p), 0770)
+	opts := bstore.Options{Timeout: 5 * time.Second, Perm: 0660, RegisterLogger: log.Logger}
+	return bstore.Open(ctx, p, &opts, EvalDBTypes...)
+}