-// : vi ts=4 sw=4 noet :
+// : vi ts=4 sw=4 noet 2
/*
==================================================================================
Copyright (c) 2019 Nokia
hdr->sub_id = htonl( UNSET_SUBID );
SET_HDR_LEN( hdr ); // ensure these are converted to net byte order
SET_HDR_TR_LEN( hdr, ctx->trace_data_len );
- //SET_HDR_D1_LEN( hdr, ctx->d1_len ); // no need until we start using them
- //SET_HDR_D2_LEN( hdr, ctx->d2_len );
+ SET_HDR_D1_LEN( hdr, ctx->d1_len );
+ //SET_HDR_D2_LEN( hdr, ctx->d2_len ); // future
}
msg->len = 0; // length of data in the payload
msg->alloc_len = mlen; // length of allocated transport buffer
msg->xaction = ((uta_mhdr_t *)msg->header)->xid; // point at transaction id in header area
msg->state = state; // fill in caller's state (likely the state of the last operation)
msg->flags |= MFL_ZEROCOPY; // this is a zerocopy sendable message
- strncpy( (char *) ((uta_mhdr_t *)msg->header)->src, ctx->my_name, RMR_MAX_SID );
+ strncpy( (char *) ((uta_mhdr_t *)msg->header)->src, ctx->my_name, RMR_MAX_SRC );
+ strncpy( (char *) ((uta_mhdr_t *)msg->header)->srcip, ctx->my_ip, RMR_MAX_SRC );
if( DEBUG > 1 ) fprintf( stderr, "[DBUG] alloc_zcmsg mlen=%ld size=%d mpl=%d flags=%02x\n", (long) mlen, size, ctx->max_plen, msg->flags );
is somewhat based on header version.
*/
static void ref_tpbuf( rmr_mbuf_t* msg, size_t alen ) {
- uta_mhdr_t* hdr; // current header
+ uta_mhdr_t* hdr = NULL; // current header
uta_v1mhdr_t* v1hdr; // version 1 header
int ver;
int hlen; // header len to use for a truncation check
break;
}
- if( msg->len > (msg->alloc_len - hlen ) ) { // more than we should have had room for; error
+ if( msg->len > (msg->alloc_len - hlen ) ) {
msg->state = RMR_ERR_TRUNC;
msg->len = msg->alloc_len - hlen; // adjust len down so user app doesn't overrun
} else {
uta_mhdr_t* hdr;
uta_v1mhdr_t* v1hdr;
int tr_old_len; // tr size in new buffer
- int coffset; // an offset to something in the header for copy
nm = (rmr_mbuf_t *) malloc( sizeof *nm );
if( nm == NULL ) {
nm->payload = (void *) v1hdr + sizeof( *v1hdr );
break;
- default: // current message always caught here
+ default: // current message version always caught here
hdr = nm->header;
- memcpy( hdr, old_msg->header, sizeof( uta_mhdr_t ) ); // ONLY copy the header portion; trace and data might have changed
- if( RMR_D1_LEN( hdr ) ) {
- coffset = DATA1_OFFSET( hdr ); // offset to d1
- memcpy( hdr + coffset, old_msg->header + coffset, RMR_D1_LEN( hdr ) ); // copy data1 and data2 if necessary
+ memcpy( hdr, old_msg->header, sizeof( uta_mhdr_t ) ); // ONLY copy the header portion; trace and data offsets might have changed
+ SET_HDR_TR_LEN( hdr, tr_len ); // must adjust trace len in new message before copy
+ if( RMR_D1_LEN( hdr ) ) {
+ memcpy( DATA1_ADDR( hdr ), DATA1_ADDR( old_msg->header), RMR_D1_LEN( hdr ) ); // copy data1 and data2 if necessary
}
if( RMR_D2_LEN( hdr ) ) {
- coffset = DATA2_OFFSET( hdr ); // offset to d2
- memcpy( hdr + coffset, old_msg->header + coffset, RMR_D2_LEN( hdr ) ); // copy data2 and data2 if necessary
+ memcpy( DATA2_ADDR( hdr ), DATA2_ADDR( old_msg->header), RMR_D2_LEN( hdr ) );
}
- SET_HDR_TR_LEN( hdr, tr_len ); // MUST set before pointing payload
nm->payload = PAYLOAD_ADDR( hdr ); // directly at the payload
- SET_HDR_TR_LEN( hdr, tr_len ); // do NOT copy old trace data, just set the new header
break;
}
reuse. They have their reasons I guess. Thus, we will free
the old transport buffer if user passes the message in; at least
our mbuf will be reused.
+
+ When msg->state is not ok, this function must set tp_state in the message as some API
+ fucntions return the message directly and do not propigate errno into the message.
*/
static rmr_mbuf_t* rcv_msg( uta_ctx_t* ctx, rmr_mbuf_t* old_msg ) {
int state;
msg->len = 0;
msg->payload = NULL;
msg->xaction = NULL;
+ msg->tp_buf = NULL;
msg->state = nng_recvmsg( ctx->nn_sock, (nng_msg **) &msg->tp_buf, NO_FLAGS ); // blocks hard until received
if( (msg->state = xlate_nng_state( msg->state, RMR_ERR_RCVFAILED )) != RMR_OK ) {
+ msg->tp_state = errno;
return msg;
}
+ msg->tp_state = 0;
if( msg->tp_buf == NULL ) { // if state is good this _should_ not be nil, but parninoia says check anyway
msg->state = RMR_ERR_EMPTY;
+ msg->tp_state = 0;
return msg;
}
msg->mtype, msg->state, msg->len, msg->payload - (unsigned char *) msg->header );
} else {
msg->state = RMR_ERR_EMPTY;
+ msg->tp_state = 0;
msg->len = 0;
msg->alloc_len = rsize;
msg->payload = NULL;
Called by rmr_send_msg() and rmr_rts_msg(), etc. and thus we assume that all pointer
validation has been done prior.
+
+ When msg->state is not ok, this function must set tp_state in the message as some API
+ fucntions return the message directly and do not propigate errno into the message.
*/
static rmr_mbuf_t* send_msg( uta_ctx_t* ctx, rmr_mbuf_t* msg, nng_socket nn_sock, int retries ) {
int state;
uta_mhdr_t* hdr;
int nng_flags = NNG_FLAG_NONBLOCK; // if we need to set any nng flags (zc buffer) add it to this
- int spin_retries = 1000; // if eagain/timeout we'll spin this many times before giving up the CPU
+ int spin_retries = 1000; // if eagain/timeout we'll spin, at max, this many times before giving up the CPU
int tr_len; // trace len in sending message so we alloc new message with same trace size
// future: ensure that application did not overrun the XID buffer; last byte must be 0
tr_len = RMR_TR_LEN( hdr ); // snarf trace len before sending as hdr is invalid after send
if( msg->flags & MFL_ADDSRC ) { // buffer was allocated as a receive buffer; must add our source
- strncpy( (char *) ((uta_mhdr_t *)msg->header)->src, ctx->my_name, RMR_MAX_SID ); // must overlay the source to be ours
+ strncpy( (char *) ((uta_mhdr_t *)msg->header)->src, ctx->my_name, RMR_MAX_SRC ); // must overlay the source to be ours
+ strncpy( (char *) ((uta_mhdr_t *)msg->header)->srcip, ctx->my_ip, RMR_MAX_SRC );
}
errno = 0;
if( retries > 0 && (state == NNG_EAGAIN || state == NNG_ETIMEDOUT) ) {
if( --spin_retries <= 0 ) { // don't give up the processor if we don't have to
retries--;
- usleep( 1 ); // sigh, give up the cpu and hope it's just 1 miscrosec
+ if( retries > 0 ) { // only if we'll loop through again
+ usleep( 1 ); // sigh, give up the cpu and hope it's just 1 miscrosec
+ }
spin_retries = 1000;
}
} else {
// future: this should not happen as all buffers we deal with are zc buffers; might make sense to remove the test and else
msg->state = RMR_ERR_SENDFAILED;
errno = ENOTSUP;
+ msg->tp_state = errno;
return msg;
/*
NOT SUPPORTED
return msg;
}
+/*
+ send message with maximum timeout.
+ Accept a message and send it to an endpoint based on message type.
+ If NNG reports that the send attempt timed out, or should be retried,
+ RMr will retry for approximately max_to microseconds; rounded to the next
+ higher value of 10.
+
+ Allocates a new message buffer for the next send. If a message type has
+ more than one group of endpoints defined, then the message will be sent
+ in round robin fashion to one endpoint in each group.
+
+ An endpoint will be looked up in the route table using the message type and
+ the subscription id. If the subscription id is "UNSET_SUBID", then only the
+ message type is used. If the initial lookup, with a subid, fails, then a
+ second lookup using just the mtype is tried.
+
+ When msg->state is not OK, this function must set tp_state in the message as
+ some API fucntions return the message directly and do not propigate errno into
+ the message.
+
+ CAUTION: this is a non-blocking send. If the message cannot be sent, then
+ it will return with an error and errno set to eagain. If the send is
+ a limited fanout, then the returned status is the status of the last
+ send attempt.
+
+*/
+static rmr_mbuf_t* mtosend_msg( void* vctx, rmr_mbuf_t* msg, int max_to ) {
+ rtable_ent_t* rte; // the route table entry which matches the message key
+ nng_socket nn_sock; // endpoint socket for send
+ uta_ctx_t* ctx;
+ int group; // selected group to get socket for
+ int send_again; // true if the message must be sent again
+ rmr_mbuf_t* clone_m; // cloned message for an nth send
+ int sock_ok; // got a valid socket from round robin select
+ char* d1;
+ int ok_sends = 0; // track number of ok sends
+
+ if( (ctx = (uta_ctx_t *) vctx) == NULL || msg == NULL ) { // bad stuff, bail fast
+ errno = EINVAL; // if msg is null, this is their clue
+ if( msg != NULL ) {
+ msg->state = RMR_ERR_BADARG;
+ errno = EINVAL; // must ensure it's not eagain
+ msg->tp_state = errno;
+ }
+ return msg;
+ }
+
+ errno = 0; // clear; nano might set, but ensure it's not left over if it doesn't
+ if( msg->header == NULL ) {
+ fprintf( stderr, "rmr_send_msg: ERROR: message had no header\n" );
+ msg->state = RMR_ERR_NOHDR;
+ errno = EBADMSG; // must ensure it's not eagain
+ msg->tp_state = errno;
+ return msg;
+ }
+
+ if( max_to < 0 ) {
+ max_to = ctx->send_retries; // convert to retries
+ }
+
+ if( (rte = uta_get_rte( ctx->rtable, msg->sub_id, msg->mtype, TRUE )) == NULL ) { // find the entry which matches subid/type allow fallback to type only key
+ if( ctx->flags & CTXFL_WARN ) {
+ fprintf( stderr, "[WARN] no endpoint for mtype=%d sub_id=%d\n", msg->mtype, msg->sub_id );
+ }
+ msg->state = RMR_ERR_NOENDPT;
+ errno = ENXIO; // must ensure it's not eagain
+ msg->tp_state = errno;
+ return msg; // caller can resend (maybe) or free
+ }
+
+ send_again = 1; // force loop entry
+ group = 0; // always start with group 0
+ while( send_again ) {
+ sock_ok = uta_epsock_rr( rte, group, &send_again, &nn_sock ); // select endpt from rr group and set again if more groups
+
+ if( DEBUG ) fprintf( stderr, "[DBUG] mtosend_msg: flgs=0x%04x type=%d again=%d group=%d len=%d sock_ok=%d\n",
+ msg->flags, msg->mtype, send_again, group, msg->len, sock_ok );
+
+ group++;
+
+ if( sock_ok ) { // with an rte we _should_ always have a socket, but don't bet on it
+ if( send_again ) {
+ clone_m = clone_msg( msg ); // must make a copy as once we send this message is not available
+ if( clone_m == NULL ) {
+ msg->state = RMR_ERR_SENDFAILED;
+ errno = ENOMEM;
+ msg->tp_state = errno;
+ if( ctx->flags & CTXFL_WARN ) {
+ fprintf( stderr, "[WARN] unable to clone message for multiple rr-group send\n" );
+ }
+ return msg;
+ }
+
+ if( DEBUG ) fprintf( stderr, "[DBUG] msg cloned: type=%d len=%d\n", msg->mtype, msg->len );
+ msg->flags |= MFL_NOALLOC; // keep send from allocating a new message; we have a clone to use
+ msg = send_msg( ctx, msg, nn_sock, max_to ); // do the hard work, msg should be nil on success
+
+ if( msg != NULL ) { // returned message indicates send error of some sort
+ rmr_free_msg( msg ); // must ditchone; pick msg so we don't have to unfiddle flags
+ msg = clone_m;
+ } else {
+ ok_sends++;
+ msg = clone_m; // clone will be the next to send
+ }
+ } else {
+ msg = send_msg( ctx, msg, nn_sock, max_to ); // send the last, and allocate a new buffer; drops the clone if it was
+ if( DEBUG ) {
+ if( msg == NULL ) {
+ fprintf( stderr, "[DBUG] mtosend_msg: send returned nil message!\n" );
+ }
+ }
+ }
+ } else {
+ if( ctx->flags & CTXFL_WARN ) {
+ fprintf( stderr, "[WARN] invalid socket for rte, setting no endpoint err: mtype=%d sub_id=%d\n", msg->mtype, msg->sub_id );
+ }
+ msg->state = RMR_ERR_NOENDPT;
+ errno = ENXIO;
+ }
+ }
+
+ if( msg ) { // call functions don't get a buffer back, so a nil check is required
+ msg->flags &= ~MFL_NOALLOC; // must return with this flag off
+ if( ok_sends ) { // multiple rr-groups and one was successful; report ok
+ msg->state = RMR_OK;
+ }
+
+ if( DEBUG ) fprintf( stderr, "[DBUG] final send stats: ok=%d group=%d state=%d\n\n", ok_sends, group, msg->state );
+
+ msg->tp_state = errno;
+ }
+
+ return msg; // last message caries the status of last/only send attempt
+}
+
+
/*
A generic wrapper to the real send to keep wormhole stuff agnostic.
We assume the wormhole function vetted the buffer so we don't have to.
Code Review / ric-plt / lib / rmr.git / blobdiff