[Asterisk-code-review] res pjsip refer/session: Calls dropped during transfer (asterisk[13])
Kevin Harwell
asteriskteam at digium.com
Tue Jun 13 14:27:45 CDT 2017
Kevin Harwell has uploaded this change for review. ( https://gerrit.asterisk.org/5812
Change subject: res_pjsip_refer/session: Calls dropped during transfer
......................................................................
res_pjsip_refer/session: Calls dropped during transfer
When doing an attended transfer it's possible for the transferer, after
receiving an accepted response from Asterisk, to send a BYE to Asterisk,
which can then be processed before Asterisk has time to start and/or
complete the transfer process. This of course causes the transfer to not
complete successfully, thus dropping the call.
This patch makes it so any BYEs received from the transferer, after the REFER,
that initiate a session end are deferred until the transfer is complete. This
allows the channel that would have otherwise been hung up by Asterisk to
remain available throughout the transfer process.
ASTERISK-27053 #close
Change-Id: I43586db79079457d92d71f1fd993be9a3b409d5a
---
M include/asterisk/res_pjsip_session.h
M res/res_pjsip_refer.c
M res/res_pjsip_session.c
M res/res_pjsip_session.exports.in
4 files changed, 46 insertions(+), 0 deletions(-)
git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/12/5812/1
diff --git a/include/asterisk/res_pjsip_session.h b/include/asterisk/res_pjsip_session.h
index 5e8eb3a..457edd8 100644
--- a/include/asterisk/res_pjsip_session.h
+++ b/include/asterisk/res_pjsip_session.h
@@ -153,6 +153,10 @@
struct ast_sip_aor *aor;
/*! From header saved at invite creation */
pjsip_fromto_hdr *saved_from_hdr;
+ /*! Whether the end of the session should be deferred */
+ unsigned int defer_end:1;
+ /*! Session end (remote hangup) requested while termination deferred */
+ unsigned int ended_while_deferred:1;
};
typedef int (*ast_sip_session_request_creation_cb)(struct ast_sip_session *session, pjsip_tx_data *tdata);
@@ -482,6 +486,13 @@
void ast_sip_session_defer_termination_cancel(struct ast_sip_session *session);
/*!
+ * \brief End the session if it had been previously deferred
+ *
+ * \param session The session to end if it had been deferred
+ */
+void ast_sip_session_end_if_deferred(struct ast_sip_session *session);
+
+/*!
* \brief Register an SDP handler
*
* An SDP handler is responsible for parsing incoming SDP streams and ensuring that
diff --git a/res/res_pjsip_refer.c b/res/res_pjsip_refer.c
index 111c4b2..ff8bc6a 100644
--- a/res/res_pjsip_refer.c
+++ b/res/res_pjsip_refer.c
@@ -543,6 +543,7 @@
}
}
+ ast_sip_session_end_if_deferred(attended->transferer);
if (response != 200) {
if (!ast_sip_push_task(attended->transferer->serializer,
defer_termination_cancel, attended->transferer)) {
@@ -772,6 +773,7 @@
/* Push it to the other session, which will have both channels with minimal locking */
if (ast_sip_push_task(other_session->serializer, refer_attended_task, attended)) {
+ ast_sip_session_end_if_deferred(session);
ast_sip_session_defer_termination_cancel(session);
ao2_cleanup(attended);
return 500;
@@ -810,9 +812,12 @@
response = xfer_response_code2sip(ast_bridge_transfer_blind(1, session->channel,
"external_replaces", context, refer_blind_callback, &refer));
+
+ ast_sip_session_end_if_deferred(session);
if (response != 200) {
ast_sip_session_defer_termination_cancel(session);
}
+
return response;
}
}
@@ -865,9 +870,12 @@
response = xfer_response_code2sip(ast_bridge_transfer_blind(1, session->channel,
exten, context, refer_blind_callback, &refer));
+
+ ast_sip_session_end_if_deferred(session);
if (response != 200) {
ast_sip_session_defer_termination_cancel(session);
}
+
return response;
}
diff --git a/res/res_pjsip_session.c b/res/res_pjsip_session.c
index 1fec089..47d1ba2 100644
--- a/res/res_pjsip_session.c
+++ b/res/res_pjsip_session.c
@@ -1903,6 +1903,9 @@
session->defer_terminate = 1;
+ session->defer_end = 1;
+ session->ended_while_deferred = 0;
+
session->scheduled_termination.id = 0;
ao2_ref(session, +1);
session->scheduled_termination.user_data = session;
@@ -1940,6 +1943,7 @@
/* Already canceled or timer fired. */
return;
}
+
session->defer_terminate = 0;
if (session->terminate_while_deferred) {
@@ -1949,6 +1953,22 @@
/* Stop the termination timer if it is still running. */
sip_session_defer_termination_stop_timer(session);
+}
+
+void ast_sip_session_end_if_deferred(struct ast_sip_session *session)
+{
+ if (!session->defer_end) {
+ return;
+ }
+
+ session->defer_end = 0;
+
+ if (session->ended_while_deferred) {
+ /* Complete the session end started by the remote hangup. */
+ ast_debug(3, "Ending session (%p) after being deferred\n", session);
+ session->ended_while_deferred = 0;
+ session_end(session);
+ }
}
struct ast_sip_session *ast_sip_dialog_get_session(pjsip_dialog *dlg)
@@ -2636,6 +2656,12 @@
}
if (inv->state == PJSIP_INV_STATE_DISCONNECTED) {
+ if (session->defer_end) {
+ ast_debug(3, "Deferring session (%p) end\n", session);
+ session->ended_while_deferred = 1;
+ return;
+ }
+
if (ast_sip_push_task(session->serializer, session_end, session)) {
/* Do it anyway even though this is not the right thread. */
session_end(session);
diff --git a/res/res_pjsip_session.exports.in b/res/res_pjsip_session.exports.in
index a39485e..fdfc5fb 100644
--- a/res/res_pjsip_session.exports.in
+++ b/res/res_pjsip_session.exports.in
@@ -3,6 +3,7 @@
LINKER_SYMBOL_PREFIXast_sip_session_terminate;
LINKER_SYMBOL_PREFIXast_sip_session_defer_termination;
LINKER_SYMBOL_PREFIXast_sip_session_defer_termination_cancel;
+ LINKER_SYMBOL_PREFIXast_sip_session_end_if_deferred;
LINKER_SYMBOL_PREFIXast_sip_session_register_sdp_handler;
LINKER_SYMBOL_PREFIXast_sip_session_unregister_sdp_handler;
LINKER_SYMBOL_PREFIXast_sip_session_register_supplement;
--
To view, visit https://gerrit.asterisk.org/5812
To unsubscribe, visit https://gerrit.asterisk.org/settings
Gerrit-Project: asterisk
Gerrit-Branch: 13
Gerrit-MessageType: newchange
Gerrit-Change-Id: I43586db79079457d92d71f1fd993be9a3b409d5a
Gerrit-Change-Number: 5812
Gerrit-PatchSet: 1
Gerrit-Owner: Kevin Harwell <kharwell at digium.com>
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