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/utils.go

@@ -0,0 +1,29 @@
+package database
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"time"
+)
+
+// resultTimestamp is a windows friendly timestamp
+const resultTimestamp = "2006-01-02T150405.999999999Z0700"
+
+// makeResultsDir creates and returns a directory for the result
+func makeResultsDir(home string, name string, ts time.Time) (string, error) {
+	p := filepath.Join(home, "msmts",
+		fmt.Sprintf("%s-%s", name, ts.Format(resultTimestamp)))
+
+	// If the path already exists, this is a problem. It should not clash, because
+	// we are using nanosecond precision for the starttime.
+	if _, e := os.Stat(p); e == nil {
+		return "", errors.New("results path already exists")
+	}
+	err := os.MkdirAll(p, 0700)
+	if err != nil {
+		return "", err
+	}
+	return p, nil
+}