#include <nng/protocol/pipeline0/push.h>
#include <nng/protocol/pipeline0/pull.h>
-
/*
Translates the nng state passed in to one of ours that is suitable to put
into the message, and sets errno to something that might be useful.
including our header). If size is 0, then the buffer allocated is the size previously
allocated (if msg is !nil) or the default size given at initialisation).
+ The trlo (trace data lengh override) is used for trace length if >0. If <= 0, then
+ the context value is used.
+
NOTE: while accurate, the nng doc implies that both the msg buffer and data buffer
are zero copy, however ONLY the message is zero copy. We now allocate and use
nng messages.
*/
-static rmr_mbuf_t* alloc_zcmsg( uta_ctx_t* ctx, rmr_mbuf_t* msg, int size, int state ) {
- size_t mlen;
+static rmr_mbuf_t* alloc_zcmsg( uta_ctx_t* ctx, rmr_mbuf_t* msg, int size, int state, int trlo ) {
+ size_t mlen; // size of the transport buffer that we'll allocate
uta_mhdr_t* hdr; // convenience pointer
+ int tr_len; // trace data len (default or override)
+
+ tr_len = trlo > 0 ? trlo : ctx->trace_data_len;
- mlen = sizeof( uta_mhdr_t ); // figure size should we not have a msg buffer
- mlen += (size > 0 ? size : ctx->max_plen); // add user requested size or size set during init
+ mlen = sizeof( uta_mhdr_t ) + tr_len + ctx->d1_len + ctx->d2_len; // start with header and trace/data lengths
+ mlen += (size > 0 ? size : ctx->max_plen); // add user requested size or size set during init
if( msg == NULL ) {
msg = (rmr_mbuf_t *) malloc( sizeof *msg );
}
msg->header = nng_msg_body( msg->tp_buf );
+ memset( msg->header, 0, sizeof( uta_mhdr_t ) ); // ensure no junk in the header area
if( (hdr = (uta_mhdr_t *) msg->header) != NULL ) {
- hdr->rmr_ver = RMR_MSG_VER; // version info should we need to recognised old style messages someday
+ hdr->rmr_ver = htonl( RMR_MSG_VER ); // set current version
+ 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 );
}
msg->len = 0; // length of data in the payload
- msg->alloc_len = mlen; // length of allocated payload
- msg->payload = msg->header + sizeof( uta_mhdr_t ); // point past header to payload (single buffer allocation above)
+ msg->alloc_len = mlen; // length of allocated transport buffer
+ msg->payload = PAYLOAD_ADDR( hdr ); // point to payload (past all header junk)
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
The alen parm is the assumed allocated length; assumed because it's a value likely
to have come from nng receive and the actual alloc len might be larger, but we
can only assume this is the total usable space.
+
+ This function returns the message with an error state set if it detects that the
+ received message might have been truncated. Check is done here as the calculation
+ is somewhat based on header version.
*/
static void ref_tpbuf( rmr_mbuf_t* msg, size_t alen ) {
- uta_mhdr_t* hdr;
+ uta_mhdr_t* hdr; // current header
+ uta_v1mhdr_t* v1hdr; // version 1 header
+ int ver;
+ int hlen; // header len to use for a truncation check
msg->header = nng_msg_body( msg->tp_buf ); // header is the start of the transport buffer
+ v1hdr = (uta_v1mhdr_t *) msg->header; // v1 will always allow us to suss out the version
- hdr = (uta_mhdr_t *) msg->header;
- hdr->rmr_ver = RMR_MSG_VER; // version info should we need to recognised old style messages someday
- msg->len = ntohl( hdr->plen ); // length sender says is in the payload (received length could be larger)
- msg->alloc_len = alen; // length of whole tp buffer (including header)
- msg->payload = msg->header + sizeof( uta_mhdr_t ); // point past header to payload (single buffer allocation above)
- msg->xaction = ((uta_mhdr_t *)msg->header)->xid; // point at transaction id in header area
- msg->flags |= MFL_ZEROCOPY; // this is a zerocopy sendable message
- msg->mtype = ntohl( hdr->mtype ); // capture and convert from network order to local order
- msg->state = RMR_OK;
+ if( v1hdr->rmr_ver == 1 ) { // bug in verion 1 didn't encode the version in network byte order
+ ver = 1;
+ v1hdr->rmr_ver = htonl( 1 ); // save it correctly in case we clone the message
+ } else {
+ ver = ntohl( v1hdr->rmr_ver );
+ }
+
+ switch( ver ) {
+ case 1:
+ msg->len = ntohl( v1hdr->plen ); // length sender says is in the payload (received length could be larger)
+ msg->alloc_len = alen; // length of whole tp buffer (including header, trace and data bits)
+ msg->payload = msg->header + sizeof( uta_v1mhdr_t ); // point past header to payload (single buffer allocation above)
+
+ msg->xaction = &v1hdr->xid[0]; // point at transaction id in header area
+ msg->flags |= MFL_ZEROCOPY; // this is a zerocopy sendable message
+ msg->mtype = ntohl( v1hdr->mtype ); // capture and convert from network order to local order
+ msg->sub_id = UNSET_SUBID; // type 1 messages didn't have this
+ msg->state = RMR_OK;
+ hlen = sizeof( uta_v1mhdr_t );
+ break;
+
+ default: // current version always lands here
+ hdr = (uta_mhdr_t *) msg->header;
+ msg->len = ntohl( hdr->plen ); // length sender says is in the payload (received length could be larger)
+ msg->alloc_len = alen; // length of whole tp buffer (including header, trace and data bits)
+
+ msg->payload = PAYLOAD_ADDR( hdr ); // at user payload
+ msg->xaction = &hdr->xid[0]; // point at transaction id in header area
+ msg->flags |= MFL_ZEROCOPY; // this is a zerocopy sendable message
+ msg->mtype = ntohl( hdr->mtype ); // capture and convert from network order to local order
+ msg->sub_id = ntohl( hdr->sub_id );
+ hlen = RMR_HDR_LEN( hdr ); // len to use for truncated check later
+ break;
+ }
+
+ if( msg->len > (msg->alloc_len - hlen ) ) { // more than we should have had room for; error
+ msg->state = RMR_ERR_TRUNC;
+ msg->len = msg->alloc_len - hlen; // adjust len down so user app doesn't overrun
+ } else {
+ msg->state = RMR_OK;
+ }
}
/*
rmr_mbuf_t* nm; // new message buffer
size_t mlen;
int state;
+ uta_mhdr_t* hdr;
+ uta_v1mhdr_t* v1hdr;
nm = (rmr_mbuf_t *) malloc( sizeof *nm );
if( nm == NULL ) {
exit( 1 );
}
- nm->header = nng_msg_body( nm->tp_buf );
+ nm->header = nng_msg_body( nm->tp_buf ); // set and copy the header from old message
+ v1hdr = (uta_v1mhdr_t *) old_msg->header; // v1 will work to dig header out of any version
+ switch( ntohl( v1hdr->rmr_ver ) ) {
+ case 1:
+ memcpy( v1hdr, old_msg->header, sizeof( *v1hdr ) ); // copy complete header
+ nm->payload = (void *) v1hdr + sizeof( *v1hdr );
+ break;
+
+ default: // current message always caught here
+ hdr = nm->header;
+ memcpy( hdr, old_msg->header, RMR_HDR_LEN( old_msg->header ) + RMR_TR_LEN( old_msg->header ) + RMR_D1_LEN( old_msg->header ) + RMR_D2_LEN( old_msg->header )); // copy complete header, trace and other data
+ nm->payload = PAYLOAD_ADDR( hdr ); // at user payload
+ break;
+ }
+
+ // --- these are all version agnostic -----------------------------------
nm->mtype = old_msg->mtype;
+ nm->sub_id = old_msg->sub_id;
nm->len = old_msg->len; // length of data in the payload
nm->alloc_len = mlen; // length of allocated payload
- nm->payload = nm->header + sizeof( uta_mhdr_t ); // point past header to payload (single buffer allocation above)
- nm->xaction = ((uta_mhdr_t *)nm->header)->xid; // point at transaction id in header area
+
+ nm->xaction = hdr->xid; // reference xaction
nm->state = old_msg->state; // fill in caller's state (likely the state of the last operation)
- nm->flags |= MFL_ZEROCOPY; // this is a zerocopy sendable message
+ nm->flags = old_msg->flags | MFL_ZEROCOPY; // this is a zerocopy sendable message
+ memcpy( nm->payload, old_msg->payload, old_msg->len );
- memcpy( ((uta_mhdr_t *)nm->header)->src, ((uta_mhdr_t *)old_msg->header)->src, RMR_MAX_SID );
+ return nm;
+}
+
+/*
+ This will clone a message with a change to the trace area in the header such that
+ it will be tr_len passed in. The trace area in the cloned message will be uninitialised.
+ The orignal message will be left unchanged, and a pointer to the new message is returned.
+ It is not possible to realloc buffers and change the data sizes.
+*/
+static inline rmr_mbuf_t* realloc_msg( rmr_mbuf_t* old_msg, int tr_len ) {
+ rmr_mbuf_t* nm; // new message buffer
+ size_t mlen;
+ int state;
+ 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 ) {
+ fprintf( stderr, "[CRI] rmr_clone: cannot get memory for message buffer\n" );
+ exit( 1 );
+ }
+ memset( nm, 0, sizeof( *nm ) );
+
+ hdr = old_msg->header;
+ tr_old_len = RMR_TR_LEN( hdr ); // bytes in old header for trace
+
+ mlen = old_msg->alloc_len + (tr_len - tr_old_len); // new length with trace adjustment
+ if( DEBUG ) fprintf( stderr, "[DBUG] tr_realloc old size=%d new size=%d new tr_len=%d\n", (int) old_msg->alloc_len, (int) mlen, (int) tr_len );
+ if( (state = nng_msg_alloc( (nng_msg **) &nm->tp_buf, mlen )) != 0 ) {
+ fprintf( stderr, "[CRI] rmr_clone: cannot get memory for zero copy buffer: %d\n", ENOMEM );
+ exit( 1 );
+ }
+
+ nm->header = nng_msg_body( nm->tp_buf ); // set and copy the header from old message
+ v1hdr = (uta_v1mhdr_t *) old_msg->header; // v1 will work to dig header out of any version
+ switch( ntohl( v1hdr->rmr_ver ) ) {
+ case 1:
+ memcpy( v1hdr, old_msg->header, sizeof( *v1hdr ) ); // copy complete header
+ nm->payload = (void *) v1hdr + sizeof( *v1hdr );
+ break;
+
+ default: // current message 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
+
+ }
+ 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
+ }
+
+ 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;
+ }
+
+ // --- these are all version agnostic -----------------------------------
+ nm->mtype = old_msg->mtype;
+ nm->sub_id = old_msg->sub_id;
+ nm->len = old_msg->len; // length of data in the payload
+ nm->alloc_len = mlen; // length of allocated payload
+
+ nm->xaction = hdr->xid; // reference xaction
+ nm->state = old_msg->state; // fill in caller's state (likely the state of the last operation)
+ nm->flags = old_msg->flags | MFL_ZEROCOPY; // this is a zerocopy sendable message
memcpy( nm->payload, old_msg->payload, old_msg->len );
return nm;
msg->tp_buf = NULL;
} else {
- //msg = alloc_zcmsg( ctx, NULL, RMR_MAX_RCV_BYTES, RMR_OK ); // will abort on failure, no need to check
msg = alloc_mbuf( ctx, RMR_OK ); // msg without a transport buffer
}
+ msg->alloc_len = 0;
msg->len = 0;
msg->payload = NULL;
msg->xaction = NULL;
- //rsize = msg->alloc_len; // set to max, and we'll get len back here too
- //msg->state = nng_recv( ctx->nn_sock, msg->header, &rsize, NO_FLAGS ); // total space (header + payload len) allocated
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 ) {
return msg;
}
rsize = nng_msg_len( msg->tp_buf );
- if( rsize >= sizeof( uta_mhdr_t ) ) { // we need at least a full header here
-
- ref_tpbuf( msg, rsize ); // point payload, header etc to the just received tp buffer
+ if( rsize >= sizeof( uta_v1mhdr_t ) ) { // we need at least a full type 1 (smallest) header here
+ ref_tpbuf( msg, rsize ); // point payload, header etc to the data and set trunc error if needed
hdr = (uta_mhdr_t *) msg->header;
- msg->flags |= MFL_ADDSRC; // turn on so if user app tries to send this buffer we reset src
- if( msg->len > (msg->alloc_len - sizeof( uta_mhdr_t )) ) { // way more than we should have had room for; error
- msg->state = RMR_ERR_TRUNC;
- }
+ msg->flags |= MFL_ADDSRC; // turn on so if user app tries to send this buffer we reset src
if( DEBUG > 1 ) fprintf( stderr, "[DBUG] rcv_msg: got something: type=%d state=%d len=%d diff=%ld\n",
msg->mtype, msg->state, msg->len, msg->payload - (unsigned char *) msg->header );
} else {
- msg->len = 0;
msg->state = RMR_ERR_EMPTY;
+ msg->len = 0;
+ msg->alloc_len = rsize;
+ msg->payload = NULL;
+ msg->xaction = NULL;
+ msg->flags |= MFL_ZEROCOPY; // this is a zerocopy sendable message
+ msg->mtype = UNSET_MSGTYPE;
+ msg->sub_id = UNSET_SUBID;
}
return msg;
if( old_msg ) {
msg = old_msg;
} else {
- msg = alloc_zcmsg( ctx, NULL, RMR_MAX_RCV_BYTES, RMR_OK ); // will abort on failure, no need to check
+ msg = alloc_zcmsg( ctx, NULL, RMR_MAX_RCV_BYTES, RMR_OK, DEF_TR_LEN ); // will abort on failure, no need to check
}
msg->state = nng_recvmsg( ctx->nn_sock, (nng_msg **) &msg->tp_buf, NO_FLAGS ); // blocks hard until received
msg->header = nng_msg_body( msg->tp_buf );
msg->len = rsize; // len is the number of bytes received
msg->alloc_len = rsize;
- msg->mtype = -1; // raw message has no type
+ msg->mtype = UNSET_MSGTYPE; // raw message has no type
+ msg->sub_id = UNSET_SUBID; // nor a subscription id
msg->state = RMR_OK;
msg->flags = MFL_RAW;
msg->payload = msg->header; // payload is the whole thing; no header
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 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
hdr = (uta_mhdr_t *) msg->header;
- hdr->mtype = htonl( msg->mtype ); // stash type/len in network byte order for transport
+ hdr->mtype = htonl( msg->mtype ); // stash type/len/sub_id in network byte order for transport
+ hdr->sub_id = htonl( msg->sub_id );
hdr->plen = htonl( msg->len );
+ 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
errno = 0;
msg->state = RMR_OK;
if( msg->flags & MFL_ZEROCOPY ) { // faster sending with zcopy buffer
- //nng_flags |= NNG_FLAG_ALLOC; // indicate a zc buffer that nng is expected to free
-
do {
if( (state = nng_sendmsg( nn_sock, (nng_msg *) msg->tp_buf, nng_flags )) != 0 ) { // must check and retry some if transient failure
msg->state = state;
msg->state = RMR_OK;
msg->header = NULL; // nano frees; don't risk accessing later by mistake
msg->tp_buf = NULL;
+ hdr = NULL;
}
} while( state && retries > 0 );
} 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;
return msg;
*/
}
- if( msg->state == RMR_OK ) { // successful send
- if( !(msg->flags & MFL_NOALLOC) ) { // allocate another sendable zc buffer unless told otherwise
- return alloc_zcmsg( ctx, msg, 0, RMR_OK ); // preallocate a zero-copy buffer and return msg
+ if( msg->state == RMR_OK ) { // successful send
+ if( !(msg->flags & MFL_NOALLOC) ) { // allocate another sendable zc buffer unless told otherwise
+ return alloc_zcmsg( ctx, msg, 0, RMR_OK, tr_len ); // preallocate a zero-copy buffer and return msg
} else {
rmr_free_msg( msg ); // not wanting a meessage back, trash this one
return NULL;
msg->state = RMR_ERR_RETRY; // errno will have nano reason
} else {
msg->state = xlate_nng_state( msg->state, RMR_ERR_SENDFAILED ); // xlate to our state and set errno
- //errno = -msg->state;
- //msg->state = RMR_ERR_SENDFAILED; // errno will have nano reason
}
if( DEBUG ) fprintf( stderr, "[DBUG] send failed: %d %s\n", (int) msg->state, strerror( msg->state ) );
Code Review / ric-plt / lib / rmr.git / blobdiff