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python: handle NULL value returned from dc_get_msg

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Returning None in this case and checked with mypy that callers can handle it.
This commit is contained in:
link2xt
2023-02-10 09:54:50 +00:00
parent c9b2ad4ffa
commit 151b34ea79
5 changed files with 41 additions and 19 deletions
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10
python/src/deltachat/message.py
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@@ -42,9 +42,15 @@ class Message(object):
)
@classmethod
def from_db(cls, account, id):
def from_db(cls, account, id) -> Optional["Message"]:
"""Attempt to load the message from the database given its ID.
None is returned if the message does not exist, i.e. deleted."""
assert id > 0
return cls(account, ffi.gc(lib.dc_get_msg(account._dc_context, id), lib.dc_msg_unref))
res = lib.dc_get_msg(account._dc_context, id)
if res == ffi.NULL:
return None
return cls(account, ffi.gc(res, lib.dc_msg_unref))
@classmethod
def new_empty(cls, account, view_type):