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Allow serializing SM state

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It is useful in some applications to get a snapshot of the stream
management state for storage outside the process, in order to recover
from crashes and other things.  The get_sm_state already present is not
suitable for this because it returns a live object tied in to the
current context and such, and containing much unneeded internal-api
data.

Introduce xmpp_sm_state_set_callback which is called every time the
state changes with a serialized state, and a dual xmpp_sm_state_restore
which takes in this serialized state and sets up a new sm_state based on
that.

The serialization is considered opaque from the PoV of the API, but is
based on CBOR to facilitate easy debugging.
This commit is contained in:
Stephen Paul Weber
2024-02-26 16:54:24 -05:00
committed by Steffen Jaeckel
parent 5690c4ed89
commit f3fa9f557b
7 changed files with 446 additions and 3 deletions
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3
src/common.h
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@@ -323,6 +323,8 @@ struct _xmpp_conn_t {
hash_t *id_handlers;
xmpp_handlist_t *handlers;
xmpp_sockopt_callback sockopt_cb;
xmpp_sm_callback sm_callback;
void *sm_callback_ctx;
};
void conn_disconnect(xmpp_conn_t *conn);
@@ -376,6 +378,7 @@ void handler_add(xmpp_conn_t *conn,
void handler_system_delete_all(xmpp_conn_t *conn);
/* utility functions */
void trigger_sm_callback(xmpp_conn_t *conn);
void reset_sm_state(xmpp_sm_state_t *sm_state);
void disconnect_mem_error(xmpp_conn_t *conn);