This will be useful for handling NOTMUCH_STATUS_OPERATION_INVALIDATED
errors that will be exposed through the bindings in a following commit.
---
 bindings/python-cffi/notmuch2/_build.py     |  3 +++
 bindings/python-cffi/notmuch2/_database.py  | 24 +++++++++++++++++++
 bindings/python-cffi/tests/test_database.py | 26 +++++++++++++++++++++
 3 files changed, 53 insertions(+)

diff --git a/bindings/python-cffi/notmuch2/_build.py b/bindings/python-cffi/notmuch2/_build.py
index 65d7dcb6..0429691a 100644
--- a/bindings/python-cffi/notmuch2/_build.py
+++ b/bindings/python-cffi/notmuch2/_build.py
@@ -118,6 +118,9 @@ ffibuilder.cdef(
                                        notmuch_database_t **database,
                                        char **error_message);
     notmuch_status_t
+    notmuch_database_reopen (notmuch_database_t *database,
+                             notmuch_database_mode_t new_mode);
+    notmuch_status_t
     notmuch_database_close (notmuch_database_t *database);
     notmuch_status_t
     notmuch_database_destroy (notmuch_database_t *database);
diff --git a/bindings/python-cffi/notmuch2/_database.py b/bindings/python-cffi/notmuch2/_database.py
index c13d9fcf..a47049ba 100644
--- a/bindings/python-cffi/notmuch2/_database.py
+++ b/bindings/python-cffi/notmuch2/_database.py
@@ -285,6 +285,30 @@ class Database(base.NotmuchObject):
             raise errors.NotmuchError(ret)
         self.closed = True
 
+    def reopen(self, mode=None):
+        """Reopen an opened notmuch database.
+
+        :param mode: Mode to reopen the database with. When None, the previously
+           active mode is preserved.
+        :type mode: :attr:`MODE`, str, or None.
+
+        This is useful e.g. for:
+        - switching the mode between read-only and read-write
+        - recovering from OperationInvalidatedError
+        """
+        if isinstance(mode, str):
+            try:
+                mode = self.STR_MODE_MAP[mode]
+            except KeyError:
+                raise ValueError('Invalid mode: %s' % mode)
+        else:
+            mode = mode or self.mode
+        self.mode = mode
+
+        ret = capi.lib.notmuch_database_reopen(self._db_p, mode.value)
+        if ret != capi.lib.NOTMUCH_STATUS_SUCCESS:
+            raise errors.NotmuchError(ret)
+
     def __enter__(self):
         return self
 
diff --git a/bindings/python-cffi/tests/test_database.py b/bindings/python-cffi/tests/test_database.py
index 1557235d..1143cf33 100644
--- a/bindings/python-cffi/tests/test_database.py
+++ b/bindings/python-cffi/tests/test_database.py
@@ -173,6 +173,32 @@ class TestRevision:
 
     # XXX add tests for revisions comparisons
 
+
+class TestMode:
+
+    def test_readonly_raises(self, db, maildir):
+        with pytest.raises(errors.ReadOnlyDatabaseError):
+            with dbmod.Database(maildir.path, 'ro',
+                                config=notmuch2.Database.CONFIG.EMPTY) as db_ro:
+                _, pathname = maildir.deliver()
+                db_ro.add(pathname)
+
+    def test_reopen_ro(self, db, maildir):
+        db.reopen(mode = dbmod.Mode.READ_ONLY)
+        with pytest.raises(errors.ReadOnlyDatabaseError):
+            _, pathname = maildir.deliver()
+            db.add(pathname)
+
+    def test_reopen_rw(self, db, maildir):
+        # release the write lock
+        db.close()
+
+        with dbmod.Database(maildir.path, 'ro',
+                            config=notmuch2.Database.CONFIG.EMPTY) as db:
+            _, pathname = maildir.deliver()
+            db.reopen(mode = dbmod.Mode.READ_WRITE)
+            db.add(pathname)
+
 class TestMessages:
 
     def test_add_message(self, db, maildir):
-- 
2.47.3

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