Robust/src/Runtime/DSTM/interface/dstmserver.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <pthread.h>
   5 #include <netdb.h>
   6 #include <fcntl.h>
   7 #include "dstm.h"
   8 #include "mlookup.h"
   9 #include "llookup.h"
  10
  11 #define LISTEN_PORT 2156
  12 #define BACKLOG 10 //max pending connections
  13 #define RECEIVE_BUFFER_SIZE 2048
  14
  15 extern int classsize[];
  16
  17 objstr_t *mainobjstore;
  18
  19 int dstmInit(void)
  20 {
  21         //Initialize main object store
  22         mainobjstore = objstrCreate(DEFAULT_OBJ_STORE_SIZE);
  23         if (mhashCreate(HASH_SIZE, LOADFACTOR))
  24                 return 1; //failure
  25
  26         if (lhashCreate(HASH_SIZE, LOADFACTOR))
  27                 return 1; //failure
  28
  29         return 0;
  30 }
  31
  32 void *dstmListen()
  33 {
  34         int listenfd, acceptfd;
  35         struct sockaddr_in my_addr;
  36         struct sockaddr_in client_addr;
  37         socklen_t addrlength = sizeof(struct sockaddr);
  38         pthread_t thread_dstm_accept;
  39         int i;
  40         int setsockflag=1;
  41
  42         listenfd = socket(AF_INET, SOCK_STREAM, 0);
  43         if (listenfd == -1)
  44         {
  45                 perror("socket");
  46                 exit(1);
  47         }
  48
  49         if (setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &setsockflag, sizeof (setsockflag)) < 0) {
  50           perror("socket");
  51           exit(1);
  52         }
  53 #ifdef MAC
  54         if (setsockopt(listenfd, SOL_SOCKET, SO_NOSIGPIPE, &setsockflag, sizeof (setsockflag)) < 0) {
  55           perror("socket");
  56           exit(1);
  57         }
  58 #endif
  59
  60         my_addr.sin_family = AF_INET;
  61         my_addr.sin_port = htons(LISTEN_PORT);
  62         my_addr.sin_addr.s_addr = INADDR_ANY;
  63         memset(&(my_addr.sin_zero), '\0', 8);
  64
  65         if (bind(listenfd, (struct sockaddr *)&my_addr, addrlength) == -1)
  66         {
  67                 perror("bind");
  68                 exit(1);
  69         }
  70
  71         if (listen(listenfd, BACKLOG) == -1)
  72         {
  73                 perror("listen");
  74                 exit(1);
  75         }
  76
  77         printf("Listening on port %d, fd = %d\n", LISTEN_PORT, listenfd);
  78         while(1)
  79         {
  80                 acceptfd = accept(listenfd, (struct sockaddr *)&client_addr, &addrlength);
  81                 pthread_create(&thread_dstm_accept, NULL, dstmAccept, (void *)acceptfd);
  82         }
  83         pthread_exit(NULL);
  84 }
  85
  86 void *dstmAccept(void *acceptfd)
  87 {
  88         int numbytes,i, val, retval;
  89         unsigned int oid;
  90         char buffer[RECEIVE_BUFFER_SIZE], control,ctrl;
  91         char *ptr;
  92         void *srcObj;
  93         objheader_t *h;
  94         trans_commit_data_t transinfo;
  95
  96         int fd_flags = fcntl((int)acceptfd, F_GETFD), size;
  97
  98         printf("Recieved connection: fd = %d\n", (int)acceptfd);
  99         if((retval = recv((int)acceptfd, &control, sizeof(char), 0)) <= 0) {
 100                 if (retval == 0) {
 101                         return; // Testing connection
 102                 }
 103                 perror("Error in receiving control from coordinator\n");
 104                 return;
 105         }
 106         switch(control) {
 107                 case READ_REQUEST:
 108                         if((retval = recv((int)acceptfd, &oid, sizeof(unsigned int), 0)) <= 0) {
 109                                 perror("Error receiving object from cooridnator\n");
 110                                 return;
 111                         }
 112                         srcObj = mhashSearch(oid);
 113                         h = (objheader_t *) srcObj;
 114                         size = sizeof(objheader_t) + sizeof(classsize[h->type]);
 115                         if (h == NULL) {
 116                                 ctrl = OBJECT_NOT_FOUND;
 117                                 if(send((int)acceptfd, &ctrl, sizeof(char), MSG_NOSIGNAL) < sizeof(char)) {
 118                                         perror("Error sending control msg to coordinator\n");
 119                                 }
 120                         } else {
 121                                 /* Type */
 122                           char msg[]={OBJECT_FOUND, 0, 0, 0, 0};
 123                           *((int *)&msg[1])=size;
 124                           if(send((int)acceptfd, &msg, sizeof(msg), MSG_NOSIGNAL) < sizeof(msg)) {
 125                             perror("Error sending size of object to coordinator\n");
 126                           }
 127                           if(send((int)acceptfd, h, size, MSG_NOSIGNAL) < size) {
 128                             perror("Error in sending object\n");
 129                           }
 130                         }
 131                         break;
 132
 133                 case READ_MULT_REQUEST:
 134                         printf("DEBUG-> READ_MULT_REQUEST\n");
 135                         break;
 136
 137                 case MOVE_REQUEST:
 138                         printf("DEBUG -> MOVE_REQUEST\n");
 139                         break;
 140
 141                 case MOVE_MULT_REQUEST:
 142                         printf("DEBUG -> MOVE_MULT_REQUEST\n");
 143                         break;
 144
 145                 case TRANS_REQUEST:
 146                         printf("DEBUG -> Recv TRANS_REQUEST\n");
 147                         if((val = readClientReq((int)acceptfd, &transinfo)) != 0) {
 148                                 printf("Error in readClientReq\n");
 149                         }
 150                         break;
 151
 152                 default:
 153                         printf("DEBUG -> dstmAccept: Error Unknown opcode %d\n", control);
 154         }
 155         if (close((int)acceptfd) == -1)
 156                 perror("close");
 157         else
 158                 printf("Closed connection: fd = %d\n", (int)acceptfd);
 159
 160         pthread_exit(NULL);
 161 }
 162
 163 // Reads transaction request per thread
 164 int readClientReq(int acceptfd, trans_commit_data_t *transinfo) {
 165         char *ptr, control, prevctrl, sendctrl, newctrl;
 166         void *modptr, *header;
 167         objheader_t *tmp_header;
 168         fixed_data_t fixed;
 169         int sum = 0, i, N, n, val, retval;
 170
 171         //Reads to process the TRANS_REQUEST protocol further
 172         // Read fixed_data
 173         N = sizeof(fixed) - 1;
 174         ptr = (char *)&fixed;;
 175         fixed.control = TRANS_REQUEST;
 176         do {
 177                 n = recv((int)acceptfd, (void *) ptr+1+sum, N-sum, 0);
 178                 sum += n;
 179         } while(sum < N && n != 0);
 180
 181         // Read list of mids
 182         int mcount = fixed.mcount;
 183         N = mcount * sizeof(unsigned int);
 184         unsigned int listmid[mcount];
 185         ptr = (char *) listmid;
 186         sum = 0;
 187         do {
 188                 n = recv((int)acceptfd, (void *) ptr+sum, N-sum, 0);
 189                 sum += n;
 190         } while(sum < N && n != 0);
 191
 192         // Read oid and version tuples
 193         int numread = fixed.numread;
 194         N = numread * (sizeof(unsigned int) + sizeof(short));
 195         char objread[N];
 196         if(numread != 0) { //If pile contains more than one object to be read,
 197                           // keep reading all objects
 198                 sum = 0;
 199                 do {
 200                         n = recv((int)acceptfd, (void *) objread, N, 0);
 201                         sum += n;
 202                 } while(sum < N && n != 0);
 203         }
 204
 205         // Read modified objects
 206         if(fixed.nummod != 0) { // If pile contains more than one modified object,
 207                                 // allocate new object store and recv all modified objects
 208                 if ((modptr = objstrAlloc(mainobjstore, fixed.sum_bytes)) == NULL) {
 209                         printf("objstrAlloc error for modified objects %s, %d\n", __FILE__, __LINE__);
 210                         return 1;
 211                 }
 212                 sum = 0;
 213                 do { // Recv the objs that are modified at Coordinator
 214                         n = recv((int)acceptfd, modptr+sum, fixed.sum_bytes-sum, 0);
 215                         sum += n;
 216                 } while (sum < fixed.sum_bytes && n != 0);
 217         }
 218
 219         // Process the information available in the TRANS_REQUEST control
 220         //Send control message as per all votes from all oids in the machine
 221         if((prevctrl = handleTransReq(acceptfd, &fixed, transinfo, listmid, objread, modptr)) == 0 ) {
 222                 printf("Handle Trans Req error %s, %d\n", __FILE__, __LINE__);
 223                 return 1;
 224         }
 225         //Read for new control message from Coordiator
 226         if((retval = recv((int)acceptfd, &control, sizeof(char), 0)) <= 0 ) {
 227                 perror("Error in receiving control message\n");
 228                 return 1;
 229         }
 230
 231         switch(control) {
 232                 case TRANS_ABORT:
 233                         //Mark all ref counts as 1 and do garbage collection
 234                         ptr = modptr;
 235                         for(i = 0; i< fixed.nummod; i++) {
 236                                 tmp_header = (objheader_t *)ptr;
 237                                 tmp_header->rcount = 1;
 238                                 ptr += sizeof(objheader_t) + classsize[tmp_header->type];
 239                         }
 240                         //Unlock objects that was locked in this machine due to this transaction
 241                         for(i = 0; i< transinfo->numlocked; i++) {
 242                                 printf("DEBUG-> Unlocking objects\n");
 243                                 header = mhashSearch(transinfo->objlocked[i]);// find the header address
 244                                 ((objheader_t *)header)->status &= ~(LOCK);
 245                         }
 246
 247                         //send ack to coordinator
 248                         printf("DEBUG -> Recv TRANS_ABORT\n");
 249                         sendctrl = TRANS_SUCESSFUL;
 250                         if(send((int)acceptfd, &sendctrl, sizeof(char), MSG_NOSIGNAL) < sizeof(char)) {
 251                                 perror("Error sending ACK to coordinator\n");
 252                                 return 1;
 253                         }
 254
 255                         ptr = NULL;
 256                         return 0;
 257                 case TRANS_COMMIT:
 258                         printf("DEBUG -> Recv TRANS_COMMIT \n");
 259                         if((val = transCommitProcess(transinfo, (int)acceptfd)) != 0) {
 260                                 printf("Error in transCommitProcess %s, %d\n", __FILE__, __LINE__);
 261                         }
 262                         break;
 263
 264                 case TRANS_ABORT_BUT_RETRY_COMMIT_WITH_RELOCATING:
 265                         //TODO expect another transrequest from client
 266                         printf("DEBUG -> Recv TRANS_ABORT_BUT_RETRY_COMMIT_WITH_RELOCATING\n");
 267                         break;
 268                 default:
 269                         printf("No response to TRANS_AGREE OR DISAGREE protocol\n");
 270                         //TODO Use fixed.trans_id  TID since Client may have died
 271                         break;
 272         }
 273         //Free memory
 274         printf("DEBUG -> Freeing...\n");
 275         fflush(stdout);
 276         if (transinfo->objmod != NULL) {
 277                 free(transinfo->objmod);
 278                 transinfo->objmod = NULL;
 279         }
 280         if (transinfo->objlocked != NULL) {
 281                 free(transinfo->objlocked);
 282                 transinfo->objlocked = NULL;
 283         }
 284         if (transinfo->objnotfound != NULL) {
 285                 free(transinfo->objnotfound);
 286                 transinfo->objnotfound = NULL;
 287         }
 288         return 0;
 289 }
 290
 291 //This function runs a decision after all objects involved in TRANS_REQUEST
 292 //and returns the appropriate control message such as TRANS_AGREE, TRANS_DISAGREE or TRANS_SOFT_ABORT to the Ccordinator
 293 char handleTransReq(int acceptfd, fixed_data_t *fixed, trans_commit_data_t *transinfo, unsigned int *listmid, char *objread, void *modptr) {
 294         int val;
 295         short version;
 296         char control = 0, ctrlmissoid, *ptr;
 297         int i, j = 0;
 298         unsigned int oid;
 299         unsigned int *oidnotfound, *oidlocked, *oidmod;
 300
 301         oidnotfound = (unsigned int *) calloc(fixed->numread + fixed->nummod, sizeof(unsigned int));
 302         oidlocked = (unsigned int *) calloc(fixed->numread + fixed->nummod, sizeof(unsigned int));
 303         oidmod = (unsigned int *) calloc(fixed->nummod, sizeof(unsigned int));
 304         // Counters and arrays to formulate decision on control message to be sent
 305         // version match or  no match
 306         int objnotfound = 0, objlocked = 0, objmod =0, v_nomatch = 0, v_matchlock = 0, v_matchnolock = 0;
 307         int objmodnotfound = 0, nummodfound = 0;
 308         void *mobj;
 309         objheader_t *headptr;
 310
 311         //Process each object present in the pile
 312         ptr = modptr;
 313
 314         //Process each oid in the machine pile/ group per thread
 315         //Should be a new function
 316         for (i = 0; i < fixed->numread + fixed->nummod; i++) {
 317                 if (i < fixed->numread) {//Object is read
 318                         int incr = sizeof(unsigned int) + sizeof(short);// Offset that points to next position in the objread array
 319                         incr *= i;
 320                         oid = *((unsigned int *)(objread + incr));
 321                         incr += sizeof(unsigned int);
 322                         version = *((short *)(objread + incr));
 323                 } else {//Obj is modified
 324                         headptr = (objheader_t *) ptr;
 325                         oid = headptr->oid;
 326                         oidmod[objmod] = oid;//Array containing modified oids
 327                         objmod++;
 328                         version = headptr->version;
 329                         ptr += sizeof(objheader_t) + classsize[headptr->type];
 330                 }
 331                 //Check if object is still present in the machine since the beginning of TRANS_REQUEST
 332                 if ((mobj = mhashSearch(oid)) == NULL) {// Obj not found
 333                         //Save the oids not found for later use
 334                         oidnotfound[objnotfound] = ((objheader_t *)mobj)->oid;
 335                         objnotfound++;
 336                 } else { // If obj found in machine (i.e. has not moved)
 337                         //Check if obj is locked
 338                         if ((((objheader_t *)mobj)->status & LOCK) == LOCK) {
 339                                 if (version == ((objheader_t *)mobj)->version) {      // If version match
 340                                         printf("DEBUG -> obj = %d locked\n", ((objheader_t *)mobj)->oid);
 341                                         v_matchlock++;
 342                                 } else {//If versions don't match ..HARD ABORT
 343                                         v_nomatch++;
 344                                         //send TRANS_DISAGREE to Coordinator
 345                                         control = TRANS_DISAGREE;
 346                                         if((val = send(acceptfd, &control, sizeof(char),MSG_NOSIGNAL)) < sizeof(char)) {
 347                                                 perror("Error in sending control to the Coordinator\n");
 348                                                 return 0;
 349                                         }
 350                                         printf("DEBUG -> Sending TRANS_DISAGREE accept_fd = %d\n", acceptfd);
 351                                         return control;
 352                                 }
 353                         } else {//Obj is not locked , so lock object
 354                                 ((objheader_t *)mobj)->status |= LOCK;
 355                                 // TESTING Add sleep to make transactions run for a long time such that
 356                                 // we can test for soft abort case
 357                                 sleep(1);
 358                                 //Save all object oids that are locked on this machine during this transaction request call
 359                                 oidlocked[objlocked] = ((objheader_t *)mobj)->oid;
 360                                 objlocked++;
 361                                 if (version == ((objheader_t *)mobj)->version) { //If versions match
 362                                         v_matchnolock++;
 363                                 } else { //If versions don't match
 364                                         v_nomatch++;
 365                                         //send TRANS_DISAGREE to Coordinator
 366                                         control = TRANS_DISAGREE;
 367                                         if((val = send(acceptfd, &control, sizeof(char), MSG_NOSIGNAL)) < sizeof(char)) {
 368                                                 perror("Error in sending control to the Coordinator\n");
 369                                                 return 0;
 370                                         }
 371                                         printf("DEBUG -> Sending TRANS_DISAGREE\n");
 372                                         return control;
 373                                 }
 374                         }
 375                 }
 376         }
 377
 378         //Decide what control message(s) to send
 379         // Should be a new function
 380         if(v_matchnolock == fixed->numread + fixed->nummod) {
 381                 //send TRANS_AGREE to Coordinator
 382                 control = TRANS_AGREE;
 383                 if((val = send(acceptfd, &control, sizeof(char), MSG_NOSIGNAL)) < sizeof(char)) {
 384                         perror("Error in sending control to Coordinator\n");
 385                         return 0;
 386                 }
 387                 printf("DEBUG -> Sending TRANS_AGREE\n");
 388         }
 389         //Condition to send TRANS_SOFT_ABORT
 390         if((v_matchlock > 0 && v_nomatch == 0) || (objnotfound > 0 && v_nomatch == 0)) {
 391                 control = TRANS_SOFT_ABORT;
 392                 char msg[]={TRANS_SOFT_ABORT, 0,0,0,0};
 393                 *((int*)&msg[1])= objnotfound;
 394
 395                 printf("DEBUG -> Sending TRANS_SOFT_ABORT\n");
 396                 //Sending control message
 397                 if((val = send(acceptfd, &msg, sizeof(msg),MSG_NOSIGNAL)) < sizeof(msg)) {
 398                         perror("Error in sending no of objects that are not found\n");
 399                         return 0;
 400                 }
 401                 //send number of oids not found and the missing oids if objects are missing in the machine
 402                 if(objnotfound != 0) {
 403                   int size = sizeof(unsigned int)*objnotfound;
 404                   if((val = send(acceptfd, oidnotfound, size ,MSG_NOSIGNAL)) < size) {
 405                                 perror("Error in sending objects that are not found\n");
 406                                 return 0;
 407                         }
 408                 }
 409         }
 410
 411         //Do the following when TRANS_DISAGREE is sent
 412         if(control == TRANS_DISAGREE) {
 413                 //Set the reference count of the object to 1 in mainstore for garbage collection
 414                 ptr = modptr;
 415                 for(i = 0; i< fixed->nummod; i++) {
 416                         headptr = (objheader_t *) ptr;
 417                         headptr->rcount = 1;
 418                         ptr += sizeof(objheader_t) + classsize[headptr->type];
 419                 }
 420                 //Unlock objects that was locked in the trans
 421                 for(i = 0; i< objlocked ; i++) {
 422                         mobj = mhashSearch(oidlocked[i]);// find the header address
 423                         ((objheader_t *)mobj)->status &= ~(LOCK);
 424                 }
 425         }
 426
 427         //Fill out the structure required for a trans commit process if pile receives a TRANS_COMMIT
 428         transinfo->objmod = oidmod;
 429         transinfo->objlocked = oidlocked;
 430         transinfo->objnotfound = oidnotfound;
 431         transinfo->modptr = modptr;
 432         transinfo->nummod = fixed->nummod;
 433         transinfo->numlocked = objlocked;
 434         transinfo->numnotfound = objnotfound;
 435
 436         return control;
 437 }
 438
 439 //Process oids in the TRANS_COMMIT requested by the participant and sends an ACK back to Coordinator
 440 int transCommitProcess(trans_commit_data_t *transinfo, int acceptfd) {
 441         objheader_t *header;
 442         int i = 0, offset = 0;
 443         char control;
 444         //Process each modified object saved in the mainobject store
 445         for(i=0; i<transinfo->nummod; i++) {
 446                 if((header = (objheader_t *) mhashSearch(transinfo->objmod[i])) == NULL) {
 447                         printf("mhashsearch returns NULL at %s, %d\n", __FILE__, __LINE__);
 448                 }
 449                 //change reference count of older address and free space in objstr ??
 450                 header->rcount = 1; //Not sure what would be th val
 451                 //change ptr address in mhash table
 452                 printf("DEBUG -> removing object oid = %d\n", transinfo->objmod[i]);
 453                 mhashRemove(transinfo->objmod[i]);
 454                 mhashInsert(transinfo->objmod[i], (transinfo->modptr + offset));
 455                 offset += sizeof(objheader_t) + classsize[header->type];
 456                 //update object version
 457                 header = (objheader_t *) mhashSearch(transinfo->objmod[i]);
 458                 header->version += 1;
 459         }
 460         for(i=0; i<transinfo->numlocked; i++) {
 461                 //unlock objects
 462                 header = (objheader_t *) mhashSearch(transinfo->objlocked[i]);
 463                 header->status &= ~(LOCK);
 464         }
 465
 466         //TODO Update location lookup table
 467
 468         //send ack to coordinator
 469         control = TRANS_SUCESSFUL;
 470         printf("DEBUG-> TRANS_SUCESSFUL\n");
 471         if(send((int)acceptfd, &control, sizeof(char), MSG_NOSIGNAL) < sizeof(char)) {
 472                 perror("Error sending ACK to coordinator\n");
 473         }
 474
 475         return 0;
 476 }
 477