refactor(ooniprobe): migrate database to internal (#979)

See https://github.com/ooni/probe/issues/2352

Co-authored-by: decfox <decfox@github.com>
Co-authored-by: Simone Basso <bassosimone@gmail.com>

internal/database/database.go

@@ -0,0 +1,72 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+	"embed"
+
+	"github.com/apex/log"
+	"github.com/ooni/probe-cli/v3/internal/netxlite"
+	migrate "github.com/rubenv/sql-migrate"
+	"github.com/upper/db/v4"
+	"github.com/upper/db/v4/adapter/sqlite"
+)
+
+//go:embed migrations/*.sql
+var efs embed.FS
+
+func readAsset(path string) ([]byte, error) {
+	filep, err := efs.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	return netxlite.ReadAllContext(context.Background(), filep)
+}
+
+func readAssetDir(path string) ([]string, error) {
+	var out []string
+	lst, err := efs.ReadDir(path)
+	if err != nil {
+		return nil, err
+	}
+	for _, e := range lst {
+		out = append(out, e.Name())
+	}
+	return out, nil
+}
+
+// RunMigrations runs the database migrations
+func RunMigrations(sess *sql.DB) error {
+	log.Debugf("running migrations")
+	migrations := &migrate.AssetMigrationSource{
+		Asset:    readAsset,
+		AssetDir: readAssetDir,
+		Dir:      "migrations",
+	}
+	n, err := migrate.Exec(sess, "sqlite3", migrations, migrate.Up)
+	if err != nil {
+		return err
+	}
+	log.Debugf("performed %d migrations", n)
+	return nil
+}
+
+// Connect to the database
+func Connect(path string) (sess db.Session, err error) {
+	settings := sqlite.ConnectionURL{
+		Database: path,
+		Options:  map[string]string{"_foreign_keys": "1"},
+	}
+	sess, err = sqlite.Open(settings)
+	if err != nil {
+		log.WithError(err).Error("failed to open the DB")
+		return nil, err
+	}
+
+	err = RunMigrations(sess.Driver().(*sql.DB))
+	if err != nil {
+		log.WithError(err).Error("failed to run DB migration")
+		return nil, err
+	}
+	return sess, err
+}