static int rpc_request_send (flux_rpc_t *rpc, int n, const char *topic,
const char *json_str, uint32_t nodeid)
{
flux_msg_t *msg;
int flags = 0;
int rc = -1;
if (!(msg = flux_request_encode (topic, json_str)))
goto done;
if (flux_msg_set_matchtag (msg, rpc->m.matchtag + n) < 0)
goto done;
if (nodeid == FLUX_NODEID_UPSTREAM) {
flags |= FLUX_MSGFLAG_UPSTREAM;
if (flux_get_rank (rpc->h, &nodeid) < 0)
goto done;
}
if (flux_msg_set_nodeid (msg, nodeid, flags) < 0)
goto done;
if (flux_send (rpc->h, msg, 0) < 0)
goto done;
rc = 0;
done:
if (msg)
flux_msg_destroy (msg);
return rc;
}
static int rpc_request_prepare (flux_rpc_t *rpc, flux_msg_t *msg,
uint32_t nodeid)
{
int flags = 0;
int rc = -1;
uint32_t matchtag = rpc->m.matchtag & ~FLUX_MATCHTAG_GROUP_MASK;
uint32_t matchgrp = rpc->m.matchtag & FLUX_MATCHTAG_GROUP_MASK;
/* So that flux_rpc_get_nodeid() can get nodeid from a response:
* For group rpc, use the lower matchtag bits to stash the nodeid
* in the request, and it will come back in the response.
* For singleton rpc, stash destination nodeid in rpc->nodeid.
* TODO-scalability: If nodeids exceed 1<<20, we may need to use a seq#
* in lower matchtag bits and stash a mapping array inthe rpc object.
*/
if (matchgrp > 0) {
if ((nodeid & FLUX_MATCHTAG_GROUP_MASK) != 0) {
errno = ERANGE;
goto done;
}
matchtag = matchgrp | nodeid;
} else
rpc->nodeid = nodeid;
if (flux_msg_set_matchtag (msg, matchtag) < 0)
goto done;
if (nodeid == FLUX_NODEID_UPSTREAM) {
flags |= FLUX_MSGFLAG_UPSTREAM;
if (flux_get_rank (rpc->h, &nodeid) < 0)
goto done;
}
if (flux_msg_set_nodeid (msg, nodeid, flags) < 0)
goto done;
rc = 0;
done:
return rc;
}
