1 // : vi ts=4 sw=4 noet:
3 ==================================================================================
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5 Copyright (c) 2018-2021 AT&T Intellectual Property.
7 Licensed under the Apache License, Version 2.0 (the "License");
8 you may not use this file except in compliance with the License.
9 You may obtain a copy of the License at
11 http://www.apache.org/licenses/LICENSE-2.0
13 Unless required by applicable law or agreed to in writing, software
14 distributed under the License is distributed on an "AS IS" BASIS,
15 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 See the License for the specific language governing permissions and
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18 ==================================================================================
22 Mnemonic: mt_call_si static.c
23 Abstract: Static funcitons related to the multi-threaded call feature
24 which are SI specific. The functions here also provide the
25 message construction functions which build a message that
26 might be split across multiple "datagrams" received from the
29 Author: E. Scott Daniels
33 #ifndef _mtcall_si_static_c
34 #define _mtcall_si_static_c
35 #include <semaphore.h>
37 static inline void queue_normal( uta_ctx_t* ctx, rmr_mbuf_t* mbuf ) {
38 static time_t last_warning = 0;
39 //static long dcount = 0;
43 if( ! uta_ring_insert( ctx->mring, mbuf ) ) {
44 rmr_free_msg( mbuf ); // drop if ring is full
48 if( time( NULL ) > last_warning + 60 ) { // issue warning no more frequently than every 60 sec
49 rmr_vlog( RMR_VL_ERR, "rmr_mt_receive: application is not receiving fast enough; %d msgs dropped since last warning\n", ctx->dcount );
50 last_warning = time( NULL );
57 chute = &ctx->chutes[0];
58 sem_post( &chute->barrier ); // tickle the ring monitor
62 Allocate a message buffer, point it at the accumulated (raw) message,
63 call ref to point to all of the various bits and set real len etc,
64 then we queue it. Raw_msg is expected to include the transport goo
65 placed in front of the RMR header and payload.
67 static void buf2mbuf( uta_ctx_t* ctx, char *raw_msg, int msg_size, int sender_fd ) {
69 uta_mhdr_t* hdr; // header of the message received
70 unsigned char* d1; // pointer at d1 data ([0] is the call_id)
72 unsigned int call_id; // the id assigned to the call generated message
74 if( PARANOID_CHECKS ) { // PARANOID mode is slower; off by default
75 if( raw_msg == NULL || msg_size <= 0 ) {
80 if( (mbuf = alloc_mbuf( ctx, RMR_ERR_UNSET )) != NULL ) {
81 mbuf->tp_buf = raw_msg;
82 mbuf->rts_fd = sender_fd;
83 if( msg_size > ctx->max_ibm + 1024 ) {
84 mbuf->flags |= MFL_HUGE; // prevent caching of oversized buffers
87 ref_tpbuf( mbuf, msg_size ); // point mbuf at bits in the datagram
88 hdr = mbuf->header; // convenience
89 if( hdr->flags & HFL_CALL_MSG ) { // call generated message; ignore call-id etc and queue
90 queue_normal( ctx, mbuf );
92 if( RMR_D1_LEN( hdr ) <= 0 ) { // no call-id data; just queue
93 queue_normal( ctx, mbuf );
95 d1 = DATA1_ADDR( hdr );
96 if( (call_id = (unsigned int) d1[D1_CALLID_IDX]) == 0 ) { // call_id not set, just queue
97 queue_normal( ctx, mbuf );
99 chute = &ctx->chutes[call_id];
101 sem_post( &chute->barrier ); // the call function can vet xaction id in their own thread
111 Given a buffer, extract the size. We assume the buffer contains one of:
115 where <int1> is the size in native storage order (v1) and <int2>
116 is the size in network order. If <mark> is present then we assume
117 that <int2> is present and we use that after translating from net
118 byte order. If <mark> is not present, we use <int1>. This allows
119 old versions of RMR to continue to work with new versions that now
120 do the right thing with byte ordering.
122 If the receiver of a message is a backlevel RMR, and it uses RTS to
123 return a message, it will only update the old size, but when the
124 message is received back at a new RMR application it will appear that
125 the message came from a new instance. Therefore, we must compare
126 the old and new sizes and if they are different we must use the old
127 size assuming that this is the case.
129 static inline uint32_t extract_mlen( unsigned char* buf ) {
130 uint32_t size; // adjusted (if needed) size for return
131 uint32_t osize; // old size
132 uint32_t* blen; // length in the buffer to extract
134 blen = (uint32_t *) buf;
135 if( *(buf + sizeof( int ) * 2 ) == TP_SZ_MARKER ) {
136 osize = *blen; // old size
137 size = ntohl( *(blen+1) ); // pick up the second integer
138 if( osize != size ) { // assume back level return to sender
139 size = osize; // MUST use old size
141 if( DEBUG > 1 ) rmr_vlog( RMR_VL_DEBUG, "extract msg len converted from net order to: %d\n", size );
143 size = *blen; // old sender didn't encode size
144 if( DEBUG > 1 ) rmr_vlog( RMR_VL_DEBUG, "extract msg len no conversion: %d\n", size );
151 This is the callback invoked when tcp data is received. It adds the data
152 to the buffer for the connection and if a complete message is received
153 then the message is queued onto the receive ring.
155 Return value indicates only that we handled the buffer and SI should continue
156 or that SI should terminate, so on error it's NOT wrong to return "ok".
158 static int mt_data_cb( void* vctx, int fd, char* buf, int buflen ) {
160 river_t* river; // river associated with the fd passed in
161 unsigned char* old_accum; // old accumulator reference should we need to realloc
162 int bidx = 0; // transport buffer index
163 int remain; // bytes in transport buf that need to be moved
164 int* mlen; // pointer to spot in buffer for conversion to int
165 int need; // bytes needed for something
168 if( PARANOID_CHECKS ) { // PARANOID mode is slower; off by default
169 if( (ctx = (uta_ctx_t *) vctx) == NULL ) {
173 ctx = (uta_ctx_t *) vctx;
176 if( buflen <= 0 || fd < 0 ) { // no buffer or invalid fd
180 if( fd >= ctx->nrivers ) {
181 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "callback fd is out of range: %d nrivers=%d\n", fd, ctx->nrivers );
182 if( (river = (river_t *) rmr_sym_pull( ctx->river_hash, (uint64_t) fd )) == NULL ) {
183 river = (river_t *) malloc( sizeof( *river ) );
184 memset( river, 0, sizeof( *river ) );
185 rmr_sym_map( ctx->river_hash, (uint64_t) fd, river );
186 river->state = RS_NEW;
189 river = &ctx->rivers[fd]; // quick index for fd values < MAX_FD
192 if( river->state != RS_GOOD ) { // all states which aren't good require reset first
193 if( river->state == RS_NEW ) {
194 if( river->accum != NULL ) {
195 free( river->accum );
197 memset( river, 0, sizeof( *river ) );
198 river->nbytes = sizeof( char ) * (ctx->max_ibm + 1024); // start with what user said would be the "normal" max inbound msg size
199 river->accum = (char *) malloc( river->nbytes );
202 // future -- sync to next marker
203 river->ipt = 0; // insert point
207 river->state = RS_GOOD;
209 while( remain > 0 ) { // until we've done something with all bytes passed in
210 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "====== data callback top of loop bidx=%d msize=%d ipt=%d remain=%d\n", bidx, river->msg_size, river->ipt, remain );
212 if( river->msg_size <= 0 ) { // don't have a message length yet
213 // FIX ME: we need a frame indicator to ensure alignment
214 need = TP_SZFIELD_LEN - river->ipt; // what we need to compute the total message length
215 if( need > remain ) { // the whole message len information isn't in this transport buf
216 if( DEBUG > 1 ) rmr_vlog( RMR_VL_DEBUG, "need more for size than we have: need=%d rmain=%d ipt=%d\n", need, remain, river->ipt );
217 memcpy( &river->accum[river->ipt], buf+bidx, remain ); // grab what we can and depart
218 river->ipt += remain;
219 if( DEBUG > 1 ) rmr_vlog( RMR_VL_DEBUG, "data callback not enough bytes to compute size; need=%d have=%d\n", need, remain );
223 if( river->ipt > 0 ) { // if we captured the start of size last go round
224 memcpy( &river->accum[river->ipt], buf + bidx, need );
228 river->msg_size = extract_mlen( river->accum );
230 rmr_vlog( RMR_VL_DEBUG, "size from accumulator =%d\n", river->msg_size );
232 dump_40( river->accum, "from accumulator:" );
233 if( river->msg_size > 100 ) {
234 dump_40( river->accum + 50, "from rmr buf:" );
239 river->msg_size = extract_mlen( &buf[bidx] ); // pull from buf as it's all there; it will copy later
241 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "data callback setting msg size: %d\n", river->msg_size );
243 if( river->msg_size > river->nbytes ) { // message bigger than app max size; grab huge buffer
244 //river->flags |= RF_DROP; // uncomment to drop large messages
245 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "received message is huge (%d) reallocating buffer\n", river->msg_size );
246 old_accum = river->accum; // need to copy any bytes we snarfed getting the size, so hold
247 river->nbytes = river->msg_size + 128; // buffer large enough with a bit of fudge room
248 river->accum = (char *) malloc( river->nbytes );
249 if( river->ipt > 0 ) {
250 memcpy( river->accum, old_accum, river->ipt + 1 ); // copy anything snarfed in getting the sie
257 if( river->msg_size > (river->ipt + remain) ) { // need more than is left in receive buffer
258 if( DEBUG > 1 ) rmr_vlog( RMR_VL_DEBUG, "data callback not enough in the buffer size=%d remain=%d\n", river->msg_size, remain );
259 if( (river->flags & RF_DROP) == 0 ) { // ok to keep this message; copy bytes
260 memcpy( &river->accum[river->ipt], buf+bidx, remain ); // grab what is in the rcv buffer and go wait for more
262 river->ipt += remain;
265 need = river->msg_size - river->ipt; // bytes from transport we need to have complete message
266 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "data callback enough in the buffer size=%d need=%d remain=%d flgs=%02x\n", river->msg_size, need, remain, river->flags );
267 if( (river->flags & RF_DROP) == 0 ) { // keeping this message, copy and pass it on
268 memcpy( &river->accum[river->ipt], buf+bidx, need ); // grab just what is needed (might be more)
269 buf2mbuf( ctx, river->accum, river->nbytes, fd ); // build an RMR mbuf and queue
270 river->nbytes = sizeof( char ) * (ctx->max_ibm + 1024); // prevent huge size from persisting
271 river->accum = (char *) malloc( sizeof( char ) * river->nbytes ); // fresh accumulator
273 if( !(river->flags & RF_NOTIFIED) ) { // not keeping huge messages; notify once per stream
274 rmr_vlog( RMR_VL_WARN, "message larger than allocated buffer (%d) arrived on fd %d\n", river->nbytes, fd );
275 river->flags |= RF_NOTIFIED;
279 river->msg_size = -1;
286 if( DEBUG >2 ) rmr_vlog( RMR_VL_DEBUG, "##### data callback finished\n" );
291 Callback driven on a disconnect notification. We will attempt to find the related
292 endpoint via the fd2ep hash maintained in the context. If we find it, then we
293 remove it from the hash, and mark the endpoint as closed so that the next attempt
294 to send forces a reconnect attempt.
296 Future: put the ep on a queue to automatically attempt to reconnect.
298 static int mt_disc_cb( void* vctx, int fd ) {
301 river_t* river = NULL;
303 if( (ctx = (uta_ctx_t *) vctx) == NULL ) {
307 if( fd < ctx->nrivers && fd >= 0 ) {
308 river = &ctx->rivers[fd];
311 river = rmr_sym_pull( ctx->river_hash, (uint64_t) fd );
312 if( DEBUG ) rmr_vlog( RMR_VL_DEBUG, "river reset on disconnect: fd=%d\n", fd );
316 if( river != NULL ) {
317 river->state = RS_NEW; // if one connects here later; ensure it's new
318 if( river->accum != NULL ) {
319 free( river->accum );
321 river->state = RS_NEW; // force realloc if the fd is used again
325 ep = fd2ep_del( ctx, fd ); // find ep and remove the fd from the hash
327 pthread_mutex_lock( &ep->gate ); // wise to lock this
330 pthread_mutex_unlock( &ep->gate );
338 This is expected to execute in a separate thread. It is responsible for
339 _all_ receives and queues them on the appropriate ring, or chute.
340 It does this by registering the callback function above with the SI world
341 and then calling SIwait() to drive the callback when data has arrived.
344 The "state" of the message is checked which determines where the message
347 Flags indicate that the message is a call generated message, then
348 the message is queued on the normal receive ring.
350 Chute ID is == 0, then the message is queued on the normal receive ring.
352 The transaction ID in the message matches the expected ID in the chute,
353 then the message is given to the chute and the chute's semaphore is tickled.
355 If none are true, the message is dropped.
357 static void* mt_receive( void* vctx ) {
360 if( (ctx = (uta_ctx_t*) vctx) == NULL ) {
361 rmr_vlog( RMR_VL_CRIT, "unable to start mt-receive: ctx was nil\n" );
365 rmr_vlog( RMR_VL_INFO, "mt_receive: pid=%lld registering SI95 data callback and waiting\n", (long long) pthread_self() );
367 SIcbreg( ctx->si_ctx, SI_CB_CDATA, mt_data_cb, vctx ); // our callback called only for "cooked" (tcp) data
368 SIcbreg( ctx->si_ctx, SI_CB_DISC, mt_disc_cb, vctx ); // our callback for handling disconnects
370 SIwait( ctx->si_ctx );
372 return NULL; // keep the compiler happy though never can be reached as SI wait doesn't return