Re: [PATCH 2/2] python/notmuch2: add bindings for the database config strings

Subject:Re: [PATCH 2/2] python/notmuch2: add bindings for the database config strings

Date:Fri, 22 May 2020 00:45:08 +0200

To:Anton Khirnov ,notmuch@notmuchmail.org

Cc:

From:Floris Bruynooghe


Thanks for adding more of the API!

This mostly is fine as well, again I'd mainly ask to add tests however.
At least the things which are implemented directly I guess: setitem,
getitem, iter and len.


On Sat 09 May 2020 at 07:05 +0200, Anton Khirnov wrote:

> ---
>  bindings/python-cffi/notmuch2/_build.py    | 17 +++++
>  bindings/python-cffi/notmuch2/_config.py   | 84 ++++++++++++++++++++++
>  bindings/python-cffi/notmuch2/_database.py | 23 ++++++
>  3 files changed, 124 insertions(+)
>  create mode 100644 bindings/python-cffi/notmuch2/_config.py
>
> diff --git a/bindings/python-cffi/notmuch2/_build.py b/bindings/python-cffi/notmuch2/_build.py
> index 5e1fcac1..f269f2a1 100644
> --- a/bindings/python-cffi/notmuch2/_build.py
> +++ b/bindings/python-cffi/notmuch2/_build.py
> @@ -314,6 +314,23 @@ ffibuilder.cdef(
>      notmuch_indexopts_get_decrypt_policy (const notmuch_indexopts_t *indexopts);
>      void
>      notmuch_indexopts_destroy (notmuch_indexopts_t *options);
> +
> +    notmuch_status_t
> +    notmuch_database_set_config (notmuch_database_t *db, const char *key, const char *value);
> +    notmuch_status_t
> +    notmuch_database_get_config (notmuch_database_t *db, const char *key, char **value);
> +    notmuch_status_t
> +    notmuch_database_get_config_list (notmuch_database_t *db, const char *prefix, notmuch_config_list_t **out);
> +    notmuch_bool_t
> +    notmuch_config_list_valid (notmuch_config_list_t *config_list);
> +    const char *
> +    notmuch_config_list_key (notmuch_config_list_t *config_list);
> +    const char *
> +    notmuch_config_list_value (notmuch_config_list_t *config_list);
> +    void
> +    notmuch_config_list_move_to_next (notmuch_config_list_t *config_list);
> +    void
> +    notmuch_config_list_destroy (notmuch_config_list_t *config_list);
>      """
>  )
>  
> diff --git a/bindings/python-cffi/notmuch2/_config.py b/bindings/python-cffi/notmuch2/_config.py
> new file mode 100644
> index 00000000..58383c16
> --- /dev/null
> +++ b/bindings/python-cffi/notmuch2/_config.py
> @@ -0,0 +1,84 @@
> +import collections.abc
> +
> +import notmuch2._base as base
> +import notmuch2._capi as capi
> +import notmuch2._errors as errors
> +
> +__all__ = ['ConfigMapping']
> +

Same style thing about 2 blank lines

> +class ConfigIter(base.NotmuchIter):
> +    def __init__(self, parent, iter_p):
> +        super().__init__(
> +            parent, iter_p,
> +            fn_destroy=capi.lib.notmuch_config_list_destroy,
> +            fn_valid=capi.lib.notmuch_config_list_valid,
> +            fn_get=capi.lib.notmuch_config_list_key,
> +            fn_next=capi.lib.notmuch_config_list_move_to_next)
> +
> +    def __next__(self):
> +        item = super().__next__()
> +        return base.BinString.from_cffi(item)
> +
> +class ConfigMapping(base.NotmuchObject, collections.abc.MutableMapping):
> +    """The config key/value pairs stored in the database.
> +
> +    The entries are exposed as a :class:`collections.abc.MutableMapping` object.
> +    Note that setting a value to an empty string is the same as deleting it.
> +
> +    :param parent: the parent object
> +    :param ptr_name: the name of the attribute on the parent which will
> +       return the memory pointer.  This allows this object to
> +       access the pointer via the parent's descriptor and thus
> +       trigger :class:`MemoryPointer`'s memory safety.
> +    """
> +
> +    def __init__(self, parent, ptr_name):
> +        self._parent = parent
> +        self._ptr = lambda: getattr(parent, ptr_name)
> +
> +    @property
> +    def alive(self):
> +        return self._parent.alive
> +
> +    def _destroy(self):
> +        pass
> +
> +    def __getitem__(self, key):
> +        if isinstance(key, str):
> +            key = key.encode('utf-8')
> +        val_pp = capi.ffi.new('char**')
> +        ret = capi.lib.notmuch_database_get_config(self._ptr(), key, val_pp)
> +        if ret != capi.lib.NOTMUCH_STATUS_SUCCESS:
> +            raise errors.NotmuchError(ret)
> +        if val_pp[0] == "":
> +            capi.lib.free(val_pp[0])
> +            raise KeyError
> +        val = base.BinString.from_cffi(val_pp[0])
> +        capi.lib.free(val_pp[0])
> +        return val
> +
> +    def __setitem__(self, key, val):
> +        if isinstance(key, str):
> +            key = key.encode('utf-8')
> +        if isinstance(val, str):
> +            val = val.encode('utf-8')
> +        ret = capi.lib.notmuch_database_set_config(self._ptr(), key, val)
> +        if ret != capi.lib.NOTMUCH_STATUS_SUCCESS:
> +            raise errors.NotmuchError(ret)
> +
> +    def __delitem__(self, key):
> +        self[key] = ""
> +
> +    def __iter__(self):
> +        """Return an iterator over the config items.
> +
> +        :raises NullPointerError: If the iterator can not be created.
> +        """
> +        configlist_pp = capi.ffi.new('notmuch_config_list_t**')
> +        ret = capi.lib.notmuch_database_get_config_list(self._ptr(), b'', configlist_pp)
> +        if ret != capi.lib.NOTMUCH_STATUS_SUCCESS:
> +            raise errors.NotmuchError(ret)
> +        return ConfigIter(self._parent, configlist_pp[0])
> +
> +    def __len__(self):
> +        return sum(1 for t in self)
> diff --git a/bindings/python-cffi/notmuch2/_database.py b/bindings/python-cffi/notmuch2/_database.py
> index f14eac78..fc55fea8 100644
> --- a/bindings/python-cffi/notmuch2/_database.py
> +++ b/bindings/python-cffi/notmuch2/_database.py
> @@ -7,6 +7,7 @@ import pathlib
>  import weakref
>  
>  import notmuch2._base as base
> +import notmuch2._config as config
>  import notmuch2._capi as capi
>  import notmuch2._errors as errors
>  import notmuch2._message as message
> @@ -536,6 +537,28 @@ class Database(base.NotmuchObject):
>              self._cached_tagset = weakref.ref(tagset)
>          return tagset
>  
> +    @property
> +    def config(self):
> +        """Return a mutable mapping with the settings stored in this database.
> +
> +        This returns an mutable dict-like object implementing the
> +        collections.abc.MutableMapping Abstract Base Class.
> +
> +        :rtype: Config
> +
> +        :raises ObjectDestroyedError: if used after destroyed.
> +        """
> +        try:
> +            ref = self._cached_config
> +        except AttributeError:
> +            config_mapping = None
> +        else:
> +            config_mapping = ref()
> +        if config_mapping is None:
> +            config_mapping = config.ConfigMapping(self, '_db_p')
> +            self._cached_config = weakref.ref(config_mapping)
> +        return config_mapping
> +
>      def _create_query(self, query, *,
>                        omit_excluded=EXCLUDE.TRUE,
>                        sort=SORT.UNSORTED,  # Check this default
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