static int script_init( struct sip_msg *foo, void *bar)
{
/* we primarily reset all private memory here to make sure
* private values left over from previous message will
* not be used again */
set_t(T_UNDEFINED);
reset_cancelled_t();
reset_e2eack_t();
/* reset the kr status */
reset_kr();
/* reset the static holders for T routes */
t_on_negative( 0 );
t_on_reply(0);
t_on_branch(0);
return 1;
}
static int do_t_cleanup( struct sip_msg *foo, void *bar)
{
struct cell *t;
empty_tmcb_list(&tmcb_pending_hl);
t = get_cancelled_t();
if (t!=NULL && t!=T_UNDEFINED)
t_unref_cell(t);
t = get_e2eack_t();
if (t!=NULL && t!=T_UNDEFINED)
t_unref_cell(t);
reset_e2eack_t();
return t_unref(foo) == 0 ? SCB_DROP_MSG : SCB_RUN_ALL;
}
static int script_init( struct sip_msg *foo, void *bar)
{
/* we primarily reset all private memory here to make sure
* private values left over from previous message will
* not be used again */
set_t(T_UNDEFINED);
reset_cancelled_t();
reset_e2eack_t();
fr_timeout = timer_id2timeout[FR_TIMER_LIST];
fr_inv_timeout = timer_id2timeout[FR_INV_TIMER_LIST];
/* reset the kill reason status */
reset_kr();
/* reset the static holders for T routes */
t_on_negative( 0 );
t_on_reply(0);
t_on_branch(0);
return SCB_RUN_ALL;
}
int t_handle_async(struct sip_msg *msg, struct action* a , int resume_route)
{
async_ctx *ctx = NULL;
async_resume_module *ctx_f;
void *ctx_p;
struct cell *t;
int r;
int fd;
/* create transaction and save everything into transaction */
t=get_t();
if ( t==0 || t==T_UNDEFINED ) {
/* create transaction */
r = t_newtran( msg , 1 /*full uas clone*/ );
if (r==0) {
/* retransmission -> no follow up; we return a negative
* code to indicate do_action that the top route is
* is completed (there no resume route to follow) */
return -1;
} else if (r<0) {
LM_ERR("could not create a new transaction\n");
goto failure;
}
t=get_t();
} else {
/* update the cloned UAS (from transaction)
* with data from current msg */
if (t->uas.request)
update_cloned_msg_from_msg( t->uas.request, msg);
}
/* run the function (the action) and get back from it the FD,
* resume function and param */
if ( a->type!=AMODULE_T || a->elem[0].type!=ACMD_ST ||
a->elem[0].u.data==NULL ) {
LM_CRIT("BUG - invalid action for async I/O - it must be"
" a MODULE_T ACMD_ST \n");
goto failure;
}
async_status = ASYNC_NO_IO; /*assume defauly status "no IO done" */
return_code = ((acmd_export_t*)(a->elem[0].u.data))->function(msg,
&ctx_f, &ctx_p,
(char*)a->elem[1].u.data, (char*)a->elem[2].u.data,
(char*)a->elem[3].u.data, (char*)a->elem[4].u.data,
(char*)a->elem[5].u.data, (char*)a->elem[6].u.data );
/* what to do now ? */
if (async_status>=0) {
/* async I/O was successfully launched */
fd = async_status;
if (msg->REQ_METHOD==METHOD_ACK ||
/* ^^^ end2end ACK, there is no actual transaction here */
t->uas.request==NULL
/* ^^^ local requests do not support async in local route */
) {
goto sync;
}
} else if (async_status==ASYNC_NO_IO) {
/* no IO, so simply go for resume route */
goto resume;
} else if (async_status==ASYNC_SYNC) {
/* IO already done in SYNC'ed way */
goto resume;
} else if (async_status==ASYNC_CHANGE_FD) {
LM_ERR("Incorrect ASYNC_CHANGE_FD status usage!"
"You should use this status only from the"
"resume function in case something went wrong"
"and you have other alternatives!\n");
/*FIXME should we go to resume or exit?it's quite an invalid scenario */
goto resume;
} else {
/* generic error, go for resume route */
goto resume;
}
/* do we have a reactor in this process, to handle this
asyn I/O ? */
if ( 0/*reactor_exists()*/ ) {
/* no reactor, so we directly call the resume function
which will block waiting for data */
goto sync;
}
if ( (ctx=shm_malloc(sizeof(async_ctx)))==NULL) {
LM_ERR("failed to allocate new ctx\n");
goto sync;
}
ctx->resume_f = ctx_f;
ctx->resume_param = ctx_p;
ctx->resume_route = resume_route;
ctx->route_type = route_type;
ctx->msg_ctx = current_processing_ctx;
ctx->t = t;
ctx->kr = get_kr();
ctx->cancelled_t = get_cancelled_t();
ctx->e2eack_t = get_e2eack_t();
current_processing_ctx = NULL;
set_t(T_UNDEFINED);
reset_cancelled_t();
reset_e2eack_t();
/* place the FD + resume function (as param) into reactor */
if (reactor_add_reader( fd, F_SCRIPT_ASYNC, RCT_PRIO_ASYNC, (void*)ctx)<0 ) {
LM_ERR("failed to add async FD to reactor -> act in sync mode\n");
goto sync;
}
/* done, break the script */
return 0;
sync:
if (ctx) {
/*
* the context was moved in reactor, but the reactor could not
* fullfil the request - we have to restore the environment -- razvanc
*/
current_processing_ctx = ctx->msg_ctx;
set_t(t);
set_cancelled_t(ctx->cancelled_t);
set_e2eack_t(ctx->e2eack_t);
shm_free(ctx);
}
/* run the resume function */
do {
return_code = ctx_f( fd, msg, ctx_p );
if (async_status == ASYNC_CHANGE_FD)
fd = return_code;
} while(async_status==ASYNC_CONTINUE||async_status==ASYNC_CHANGE_FD);
/* run the resume route in sync mode */
run_resume_route( resume_route, msg);
/* break original script */
return 0;
failure:
/* execute here the resume route with failure indication */
return_code = -1;
resume:
/* run the resume route */
run_resume_route( resume_route, msg);
/* the triggering route is terminated and whole script ended */
return 0;
}
