| 1 |
|
%%% @doc Encoder and decoder for MAM messages |
| 2 |
|
%%% |
| 3 |
|
%%% Default implementations are: |
| 4 |
|
%%% - mam_message_xml |
| 5 |
|
%%% - mam_message_eterm |
| 6 |
|
%%% - mam_message_compressed_eterm |
| 7 |
|
-module(mam_message). |
| 8 |
|
|
| 9 |
|
-ignore_xref([behaviour_info/1]). |
| 10 |
|
|
| 11 |
|
-callback encode(exml:element()) -> binary(). |
| 12 |
|
-callback decode(binary()) -> exml:element(). |
| 13 |
|
|
| 14 |
|
-export([encode/2, decode/2]). |
| 15 |
|
|
| 16 |
|
-include_lib("kernel/include/logger.hrl"). |
| 17 |
|
-include_lib("exml/include/exml.hrl"). |
| 18 |
|
|
| 19 |
|
-spec encode(module(), exml:element()) -> binary(). |
| 20 |
10416 |
encode(Mod, Packet) -> Mod:encode(Packet). |
| 21 |
|
|
| 22 |
|
-spec decode(module(), binary()) -> exml:element(). |
| 23 |
|
decode(Mod, Bin) -> |
| 24 |
5159 |
try |
| 25 |
5159 |
Mod:decode(Bin) |
| 26 |
|
catch Class:Reason:Stacktrace -> |
| 27 |
21 |
?LOG_ERROR(#{what => mam_failed_to_decode_message, |
| 28 |
|
encoded_message => Bin, |
| 29 |
:-( |
class => Class, reason => Reason, stacktrace => Stacktrace}), |
| 30 |
21 |
error_stanza() |
| 31 |
|
end. |
| 32 |
|
|
| 33 |
|
error_stanza() -> |
| 34 |
21 |
Text = <<"Failed to decode message in database">>, |
| 35 |
21 |
Err = mongoose_xmpp_errors:internal_server_error(<<"en">>, Text), |
| 36 |
21 |
Body = #xmlel{name = <<"body">>, children = [#xmlcdata{content = Text}]}, |
| 37 |
21 |
#xmlel{name = <<"message">>, |
| 38 |
|
attrs = [{<<"type">>, <<"error">>}], |
| 39 |
|
children = [Err, Body]}. |