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Make roster subscriptions work better with invalid roster state in db

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Sometimes we can observer combinations of subscription/ask that shouldn't
happen normally, but can be generated with api calls, let's try to handle
that gracefully instead of crashing.
This commit is contained in:
Paweł Chmielowski 2020-09-22 13:48:49 +02:00
parent 385af01587
commit 583dd15beb
1 changed files with 51 additions and 2 deletions
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53
src/mod_roster.erl
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@ -708,6 +708,30 @@ in_state_change(both, none, subscribe) -> none;
in_state_change(both, none, subscribed) -> none;
in_state_change(both, none, unsubscribe) -> {to, none};
in_state_change(both, none, unsubscribed) ->
{from, none};
% Invalid states that can occurs from roster modification from API
in_state_change(to, out, subscribe) -> {to, in};
in_state_change(to, out, subscribed) -> none;
in_state_change(to, out, unsubscribe) -> none;
in_state_change(to, out, unsubscribed) -> {none, none};
in_state_change(to, both, subscribe) -> none;
in_state_change(to, both, subscribed) -> none;
in_state_change(to, both, unsubscribe) -> {to, none};
in_state_change(to, both, unsubscribed) -> {none, in};
in_state_change(from, in, subscribe) -> none;
in_state_change(from, in, subscribed) -> {both, none};
in_state_change(from, in, unsubscribe) ->
{none, none};
in_state_change(from, in, unsubscribed) -> none;
in_state_change(from, both, subscribe) -> none;
in_state_change(from, both, subscribed) -> {both, none};
in_state_change(from, both, unsubscribe) -> {none, out};
in_state_change(from, both, unsubscribed) ->
{from, none};
in_state_change(both, _, subscribe) -> none;
in_state_change(both, _, subscribed) -> none;
in_state_change(both, _, unsubscribe) -> {to, none};
in_state_change(both, _, unsubscribed) ->
{from, none}.
out_state_change(none, none, subscribe) -> {none, out};
@ -715,8 +739,7 @@ out_state_change(none, none, subscribed) -> none;
out_state_change(none, none, unsubscribe) -> none;
out_state_change(none, none, unsubscribed) -> none;
out_state_change(none, out, subscribe) ->
{none,
out}; %% We need to resend query (RFC3921, section 9.2)
{none, out}; %% We need to resend query (RFC3921, section 9.2)
out_state_change(none, out, subscribed) -> none;
out_state_change(none, out, unsubscribe) ->
{none, none};
@ -755,6 +778,32 @@ out_state_change(both, none, subscribed) -> none;
out_state_change(both, none, unsubscribe) ->
{from, none};
out_state_change(both, none, unsubscribed) ->
{to, none};
% Invalid states that can occurs from roster modification from API
out_state_change(to, out, subscribe) -> none;
out_state_change(to, out, subscribed) -> {both, none};
out_state_change(to, out, unsubscribe) -> {none, none};
out_state_change(to, out, unsubscribed) -> none;
out_state_change(to, both, subscribe) -> none;
out_state_change(to, both, subscribed) -> {both, none};
out_state_change(to, both, unsubscribe) -> {none, in};
out_state_change(to, both, unsubscribed) -> {to, none};
out_state_change(from, in, subscribe) -> {from, out};
out_state_change(from, in, subscribed) -> none;
out_state_change(from, in, unsubscribe) -> none;
out_state_change(from, in, unsubscribed) ->
{none, none};
out_state_change(from, both, subscribe) -> none;
out_state_change(from, both, subscribed) -> none;
out_state_change(from, both, unsubscribe) ->
{from, none};
out_state_change(from, both, unsubscribed) ->
{none, out};
out_state_change(both, _, subscribe) -> none;
out_state_change(both, _, subscribed) -> none;
out_state_change(both, _, unsubscribe) ->
{from, none};
out_state_change(both, _, unsubscribed) ->
{to, none}.
in_auto_reply(from, none, subscribe) -> subscribed;