git.sesse.net Git - cubemap/blob - server.cpp

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <stdint.h>
   4 #include <unistd.h>
   5 #include <assert.h>
   6 #include <arpa/inet.h>
   7 #include <sys/socket.h>
   8 #include <pthread.h>
   9 #include <sys/types.h>
  10 #include <sys/ioctl.h>
  11 #include <sys/epoll.h>
  12 #include <sys/sendfile.h>
  13 #include <time.h>
  14 #include <signal.h>
  15 #include <errno.h>
  16 #include <vector>
  17 #include <string>
  18 #include <map>
  19 #include <algorithm>
  20
  21 #include "markpool.h"
  22 #include "metacube.h"
  23 #include "server.h"
  24 #include "mutexlock.h"
  25 #include "parse.h"
  26 #include "util.h"
  27 #include "state.pb.h"
  28
  29 using namespace std;
  30
  31 Client::Client(int sock)
  32         : sock(sock),
  33           fwmark(0),
  34           connect_time(time(NULL)),
  35           state(Client::READING_REQUEST),
  36           stream(NULL),
  37           header_or_error_bytes_sent(0),
  38           bytes_sent(0)
  39 {
  40         request.reserve(1024);
  41
  42         // Find the remote address, and convert it to ASCII.
  43         sockaddr_in6 addr;
  44         socklen_t addr_len = sizeof(addr);
  45
  46         if (getpeername(sock, reinterpret_cast<sockaddr *>(&addr), &addr_len) == -1) {
  47                 perror("getpeername");
  48                 remote_addr = "";
  49         } else {
  50                 char buf[INET6_ADDRSTRLEN];
  51                 if (inet_ntop(addr.sin6_family, &addr.sin6_addr, buf, sizeof(buf)) == NULL) {
  52                         perror("inet_ntop");
  53                         remote_addr = "";
  54                 } else {
  55                         remote_addr = buf;
  56                 }
  57         }
  58 }
  59
  60 Client::Client(const ClientProto &serialized, Stream *stream)
  61         : sock(serialized.sock()),
  62           remote_addr(serialized.remote_addr()),
  63           connect_time(serialized.connect_time()),
  64           state(State(serialized.state())),
  65           request(serialized.request()),
  66           stream_id(serialized.stream_id()),
  67           stream(stream),
  68           header_or_error(serialized.header_or_error()),
  69           header_or_error_bytes_sent(serialized.header_or_error_bytes_sent()),
  70           bytes_sent(serialized.bytes_sent())
  71 {
  72         if (stream->mark_pool != NULL) {
  73                 fwmark = stream->mark_pool->get_mark();
  74         } else {
  75                 fwmark = 0;  // No mark.
  76         }
  77         if (setsockopt(sock, SOL_SOCKET, SO_MARK, &fwmark, sizeof(fwmark)) == -1) {
  78                 if (fwmark != 0) {
  79                         perror("setsockopt(SO_MARK)");
  80                 }
  81         }
  82 }
  83
  84 ClientProto Client::serialize() const
  85 {
  86         ClientProto serialized;
  87         serialized.set_sock(sock);
  88         serialized.set_remote_addr(remote_addr);
  89         serialized.set_connect_time(connect_time);
  90         serialized.set_state(state);
  91         serialized.set_request(request);
  92         serialized.set_stream_id(stream_id);
  93         serialized.set_header_or_error(header_or_error);
  94         serialized.set_header_or_error_bytes_sent(serialized.header_or_error_bytes_sent());
  95         serialized.set_bytes_sent(bytes_sent);
  96         return serialized;
  97 }
  98
  99 ClientStats Client::get_stats() const
 100 {
 101         ClientStats stats;
 102         stats.stream_id = stream_id;
 103         stats.remote_addr = remote_addr;
 104         stats.connect_time = connect_time;
 105         stats.bytes_sent = bytes_sent;
 106         return stats;
 107 }
 108
 109 Stream::Stream(const string &stream_id, size_t backlog_size)
 110         : stream_id(stream_id),
 111           data_fd(make_tempfile("")),
 112           backlog_size(backlog_size),
 113           bytes_received(0),
 114           mark_pool(NULL)
 115 {
 116         if (data_fd == -1) {
 117                 exit(1);
 118         }
 119 }
 120
 121 Stream::~Stream()
 122 {
 123         if (data_fd != -1) {
 124                 int ret;
 125                 do {
 126                         ret = close(data_fd);
 127                 } while (ret == -1 && errno == EINTR);
 128                 if (ret == -1) {
 129                         perror("close");
 130                 }
 131         }
 132 }
 133
 134 Stream::Stream(const StreamProto &serialized)
 135         : stream_id(serialized.stream_id()),
 136           header(serialized.header()),
 137           data_fd(make_tempfile(serialized.data())),
 138           backlog_size(serialized.backlog_size()),
 139           bytes_received(serialized.bytes_received()),
 140           mark_pool(NULL)
 141 {
 142         if (data_fd == -1) {
 143                 exit(1);
 144         }
 145 }
 146
 147 StreamProto Stream::serialize()
 148 {
 149         StreamProto serialized;
 150         serialized.set_header(header);
 151         if (!read_tempfile(data_fd, serialized.mutable_data())) {  // Closes data_fd.
 152                 exit(1);
 153         }
 154         serialized.set_backlog_size(backlog_size);
 155         serialized.set_bytes_received(bytes_received);
 156         serialized.set_stream_id(stream_id);
 157         data_fd = -1;
 158         return serialized;
 159 }
 160
 161 void Stream::put_client_to_sleep(Client *client)
 162 {
 163         sleeping_clients.push_back(client);
 164 }
 165
 166 void Stream::wake_up_all_clients()
 167 {
 168         if (to_process.empty()) {
 169                 swap(sleeping_clients, to_process);
 170         } else {
 171                 to_process.insert(to_process.end(), sleeping_clients.begin(), sleeping_clients.end());
 172                 sleeping_clients.clear();
 173         }
 174 }
 175
 176 Server::Server()
 177 {
 178         pthread_mutex_init(&mutex, NULL);
 179         pthread_mutex_init(&queued_data_mutex, NULL);
 180
 181         epoll_fd = epoll_create(1024);  // Size argument is ignored.
 182         if (epoll_fd == -1) {
 183                 perror("epoll_fd");
 184                 exit(1);
 185         }
 186 }
 187
 188 Server::~Server()
 189 {
 190         int ret;
 191         do {
 192                 ret = close(epoll_fd);
 193         } while (ret == -1 && errno == EINTR);
 194
 195         if (ret == -1) {
 196                 perror("close(epoll_fd)");
 197         }
 198 }
 199
 200 vector<ClientStats> Server::get_client_stats() const
 201 {
 202         vector<ClientStats> ret;
 203
 204         MutexLock lock(&mutex);
 205         for (map<int, Client>::const_iterator client_it = clients.begin();
 206              client_it != clients.end();
 207              ++client_it) {
 208                 ret.push_back(client_it->second.get_stats());
 209         }
 210         return ret;
 211 }
 212
 213 void Server::do_work()
 214 {
 215         for ( ;; ) {
 216                 int nfds = epoll_wait(epoll_fd, events, EPOLL_MAX_EVENTS, EPOLL_TIMEOUT_MS);
 217                 if (nfds == -1 && errno == EINTR) {
 218                         if (should_stop) {
 219                                 return;
 220                         }
 221                         continue;
 222                 }
 223                 if (nfds == -1) {
 224                         perror("epoll_wait");
 225                         exit(1);
 226                 }
 227
 228                 MutexLock lock(&mutex);  // We release the mutex between iterations.
 229
 230                 process_queued_data();
 231
 232                 for (int i = 0; i < nfds; ++i) {
 233                         int fd = events[i].data.fd;
 234                         assert(clients.count(fd) != 0);
 235                         Client *client = &clients[fd];
 236
 237                         if (events[i].events & (EPOLLERR | EPOLLRDHUP | EPOLLHUP)) {
 238                                 close_client(client);
 239                                 continue;
 240                         }
 241
 242                         process_client(client);
 243                 }
 244
 245                 for (map<string, Stream *>::iterator stream_it = streams.begin();
 246                      stream_it != streams.end();
 247                      ++stream_it) {
 248                         vector<Client *> to_process;
 249                         swap(stream_it->second->to_process, to_process);
 250                         for (size_t i = 0; i < to_process.size(); ++i) {
 251                                 process_client(to_process[i]);
 252                         }
 253                 }
 254
 255                 if (should_stop) {
 256                         return;
 257                 }
 258         }
 259 }
 260
 261 CubemapStateProto Server::serialize()
 262 {
 263         // We don't serialize anything queued, so empty the queues.
 264         process_queued_data();
 265
 266         CubemapStateProto serialized;
 267         for (map<int, Client>::const_iterator client_it = clients.begin();
 268              client_it != clients.end();
 269              ++client_it) {
 270                 serialized.add_clients()->MergeFrom(client_it->second.serialize());
 271         }
 272         for (map<string, Stream *>::const_iterator stream_it = streams.begin();
 273              stream_it != streams.end();
 274              ++stream_it) {
 275                 serialized.add_streams()->MergeFrom(stream_it->second->serialize());
 276         }
 277         return serialized;
 278 }
 279
 280 void Server::add_client_deferred(int sock)
 281 {
 282         MutexLock lock(&queued_data_mutex);
 283         queued_add_clients.push_back(sock);
 284 }
 285
 286 void Server::add_client(int sock)
 287 {
 288         clients.insert(make_pair(sock, Client(sock)));
 289
 290         // Start listening on data from this socket.
 291         epoll_event ev;
 292         ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
 293         ev.data.u64 = 0;  // Keep Valgrind happy.
 294         ev.data.fd = sock;
 295         if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
 296                 perror("epoll_ctl(EPOLL_CTL_ADD)");
 297                 exit(1);
 298         }
 299
 300         process_client(&clients[sock]);
 301 }
 302
 303 void Server::add_client_from_serialized(const ClientProto &client)
 304 {
 305         MutexLock lock(&mutex);
 306         Stream *stream = find_stream(client.stream_id());
 307         clients.insert(make_pair(client.sock(), Client(client, stream)));
 308         Client *client_ptr = &clients[client.sock()];
 309
 310         // Start listening on data from this socket.
 311         epoll_event ev;
 312         if (client.state() == Client::READING_REQUEST) {
 313                 ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
 314         } else {
 315                 // If we don't have more data for this client, we'll be putting it into
 316                 // the sleeping array again soon.
 317                 ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
 318         }
 319         ev.data.u64 = 0;  // Keep Valgrind happy.
 320         ev.data.fd = client.sock();
 321         if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, client.sock(), &ev) == -1) {
 322                 perror("epoll_ctl(EPOLL_CTL_ADD)");
 323                 exit(1);
 324         }
 325
 326         if (client_ptr->state == Client::SENDING_DATA &&
 327             client_ptr->bytes_sent == client_ptr->stream->bytes_received) {
 328                 client_ptr->stream->put_client_to_sleep(client_ptr);
 329         } else {
 330                 process_client(client_ptr);
 331         }
 332 }
 333
 334 void Server::add_stream(const string &stream_id, size_t backlog_size)
 335 {
 336         MutexLock lock(&mutex);
 337         streams.insert(make_pair(stream_id, new Stream(stream_id, backlog_size)));
 338 }
 339
 340 void Server::add_stream_from_serialized(const StreamProto &stream)
 341 {
 342         MutexLock lock(&mutex);
 343         streams.insert(make_pair(stream.stream_id(), new Stream(stream)));
 344 }
 345
 346 void Server::set_header(const string &stream_id, const string &header)
 347 {
 348         MutexLock lock(&mutex);
 349         find_stream(stream_id)->header = header;
 350
 351         // If there are clients we haven't sent anything to yet, we should give
 352         // them the header, so push back into the SENDING_HEADER state.
 353         for (map<int, Client>::iterator client_it = clients.begin();
 354              client_it != clients.end();
 355              ++client_it) {
 356                 Client *client = &client_it->second;
 357                 if (client->state == Client::SENDING_DATA &&
 358                     client->bytes_sent == 0) {
 359                         construct_header(client);
 360                 }
 361         }
 362 }
 363
 364 void Server::set_mark_pool(const std::string &stream_id, MarkPool *mark_pool)
 365 {
 366         MutexLock lock(&mutex);
 367         assert(clients.empty());
 368         find_stream(stream_id)->mark_pool = mark_pool;
 369 }
 370
 371 void Server::add_data_deferred(const string &stream_id, const char *data, size_t bytes)
 372 {
 373         MutexLock lock(&queued_data_mutex);
 374         queued_data[stream_id].append(string(data, data + bytes));
 375 }
 376
 377 void Server::add_data(const string &stream_id, const char *data, ssize_t bytes)
 378 {
 379         Stream *stream = find_stream(stream_id);
 380         size_t pos = stream->bytes_received % stream->backlog_size;
 381         stream->bytes_received += bytes;
 382
 383         if (pos + bytes > stream->backlog_size) {
 384                 ssize_t to_copy = stream->backlog_size - pos;
 385                 while (to_copy > 0) {
 386                         int ret = pwrite(stream->data_fd, data, to_copy, pos);
 387                         if (ret == -1 && errno == EINTR) {
 388                                 continue;
 389                         }
 390                         if (ret == -1) {
 391                                 perror("pwrite");
 392                                 // Dazed and confused, but trying to continue...
 393                                 break;
 394                         }
 395                         pos += ret;
 396                         data += ret;
 397                         to_copy -= ret;
 398                         bytes -= ret;
 399                 }
 400                 pos = 0;
 401         }
 402
 403         while (bytes > 0) {
 404                 int ret = pwrite(stream->data_fd, data, bytes, pos);
 405                 if (ret == -1 && errno == EINTR) {
 406                         continue;
 407                 }
 408                 if (ret == -1) {
 409                         perror("pwrite");
 410                         // Dazed and confused, but trying to continue...
 411                         break;
 412                 }
 413                 pos += ret;
 414                 data += ret;
 415                 bytes -= ret;
 416         }
 417
 418         stream->wake_up_all_clients();
 419 }
 420
 421 // See the .h file for postconditions after this function.
 422 void Server::process_client(Client *client)
 423 {
 424         switch (client->state) {
 425         case Client::READING_REQUEST: {
 426 read_request_again:
 427                 // Try to read more of the request.
 428                 char buf[1024];
 429                 int ret;
 430                 do {
 431                         ret = read(client->sock, buf, sizeof(buf));
 432                 } while (ret == -1 && errno == EINTR);
 433
 434                 if (ret == -1 && errno == EAGAIN) {
 435                         // No more data right now. Nothing to do.
 436                         // This is postcondition #2.
 437                         return;
 438                 }
 439                 if (ret == -1) {
 440                         perror("read");
 441                         close_client(client);
 442                         return;
 443                 }
 444                 if (ret == 0) {
 445                         // OK, the socket is closed.
 446                         close_client(client);
 447                         return;
 448                 }
 449
 450                 RequestParseStatus status = wait_for_double_newline(&client->request, buf, ret);
 451
 452                 switch (status) {
 453                 case RP_OUT_OF_SPACE:
 454                         fprintf(stderr, "WARNING: fd %d sent overlong request!\n", client->sock);
 455                         close_client(client);
 456                         return;
 457                 case RP_NOT_FINISHED_YET:
 458                         // OK, we don't have the entire header yet. Fine; we'll get it later.
 459                         // See if there's more data for us.
 460                         goto read_request_again;
 461                 case RP_EXTRA_DATA:
 462                         fprintf(stderr, "WARNING: fd %d had junk data after request!\n", client->sock);
 463                         close_client(client);
 464                         return;
 465                 case RP_FINISHED:
 466                         break;
 467                 }
 468
 469                 assert(status == RP_FINISHED);
 470
 471                 int error_code = parse_request(client);
 472                 if (error_code == 200) {
 473                         construct_header(client);
 474                 } else {
 475                         construct_error(client, error_code);
 476                 }
 477
 478                 // We've changed states, so fall through.
 479                 assert(client->state == Client::SENDING_ERROR ||
 480                        client->state == Client::SENDING_HEADER);
 481         }
 482         case Client::SENDING_ERROR:
 483         case Client::SENDING_HEADER: {
 484 sending_header_or_error_again:
 485                 int ret;
 486                 do {
 487                         ret = write(client->sock,
 488                                     client->header_or_error.data() + client->header_or_error_bytes_sent,
 489                                     client->header_or_error.size() - client->header_or_error_bytes_sent);
 490                 } while (ret == -1 && errno == EINTR);
 491
 492                 if (ret == -1 && errno == EAGAIN) {
 493                         // We're out of socket space, so now we're at the “low edge” of epoll's
 494                         // edge triggering. epoll will tell us when there is more room, so for now,
 495                         // just return.
 496                         // This is postcondition #4.
 497                         return;
 498                 }
 499
 500                 if (ret == -1) {
 501                         // Error! Postcondition #1.
 502                         perror("write");
 503                         close_client(client);
 504                         return;
 505                 }
 506
 507                 client->header_or_error_bytes_sent += ret;
 508                 assert(client->header_or_error_bytes_sent <= client->header_or_error.size());
 509
 510                 if (client->header_or_error_bytes_sent < client->header_or_error.size()) {
 511                         // We haven't sent all yet. Fine; go another round.
 512                         goto sending_header_or_error_again;
 513                 }
 514
 515                 // We're done sending the header or error! Clear it to release some memory.
 516                 client->header_or_error.clear();
 517
 518                 if (client->state == Client::SENDING_ERROR) {
 519                         // We're done sending the error, so now close.
 520                         // This is postcondition #1.
 521                         close_client(client);
 522                         return;
 523                 }
 524
 525                 // Start sending from the end. In other words, we won't send any of the backlog,
 526                 // but we'll start sending immediately as we get data.
 527                 // This is postcondition #3.
 528                 client->state = Client::SENDING_DATA;
 529                 client->bytes_sent = client->stream->bytes_received;
 530                 client->stream->put_client_to_sleep(client);
 531                 return;
 532         }
 533         case Client::SENDING_DATA: {
 534 sending_data_again:
 535                 // See if there's some data we've lost. Ideally, we should drop to a block boundary,
 536                 // but resync will be the mux's problem.
 537                 Stream *stream = client->stream;
 538                 size_t bytes_to_send = stream->bytes_received - client->bytes_sent;
 539                 if (bytes_to_send == 0) {
 540                         return;
 541                 }
 542                 if (bytes_to_send > stream->backlog_size) {
 543                         fprintf(stderr, "WARNING: fd %d lost %lld bytes, maybe too slow connection\n",
 544                                 client->sock,
 545                                 (long long int)(bytes_to_send - stream->backlog_size));
 546                         client->bytes_sent = stream->bytes_received - stream->backlog_size;
 547                         bytes_to_send = stream->backlog_size;
 548                 }
 549
 550                 // See if we need to split across the circular buffer.
 551                 bool more_data = false;
 552                 if ((client->bytes_sent % stream->backlog_size) + bytes_to_send > stream->backlog_size) {
 553                         bytes_to_send = stream->backlog_size - (client->bytes_sent % stream->backlog_size);
 554                         more_data = true;
 555                 }
 556
 557                 ssize_t ret;
 558                 do {
 559                         loff_t offset = client->bytes_sent % stream->backlog_size;
 560                         ret = sendfile(client->sock, stream->data_fd, &offset, bytes_to_send);
 561                 } while (ret == -1 && errno == EINTR);
 562
 563                 if (ret == -1 && errno == EAGAIN) {
 564                         // We're out of socket space, so return; epoll will wake us up
 565                         // when there is more room.
 566                         // This is postcondition #4.
 567                         return;
 568                 }
 569                 if (ret == -1) {
 570                         // Error, close; postcondition #1.
 571                         perror("sendfile");
 572                         close_client(client);
 573                         return;
 574                 }
 575                 client->bytes_sent += ret;
 576
 577                 if (client->bytes_sent == stream->bytes_received) {
 578                         // We don't have any more data for this client, so put it to sleep.
 579                         // This is postcondition #3.
 580                         stream->put_client_to_sleep(client);
 581                 } else if (more_data) {
 582                         goto sending_data_again;
 583                 }
 584                 break;
 585         }
 586         default:
 587                 assert(false);
 588         }
 589 }
 590
 591 int Server::parse_request(Client *client)
 592 {
 593         vector<string> lines = split_lines(client->request);
 594         if (lines.empty()) {
 595                 return 400;  // Bad request (empty).
 596         }
 597
 598         vector<string> request_tokens = split_tokens(lines[0]);
 599         if (request_tokens.size() < 2) {
 600                 return 400;  // Bad request (empty).
 601         }
 602         if (request_tokens[0] != "GET") {
 603                 return 400;  // Should maybe be 405 instead?
 604         }
 605         if (streams.count(request_tokens[1]) == 0) {
 606                 return 404;  // Not found.
 607         }
 608
 609         client->stream_id = request_tokens[1];
 610         client->stream = find_stream(client->stream_id);
 611         if (client->stream->mark_pool != NULL) {
 612                 client->fwmark = client->stream->mark_pool->get_mark();
 613         } else {
 614                 client->fwmark = 0;  // No mark.
 615         }
 616         if (setsockopt(client->sock, SOL_SOCKET, SO_MARK, &client->fwmark, sizeof(client->fwmark)) == -1) {
 617                 if (client->fwmark != 0) {
 618                         perror("setsockopt(SO_MARK)");
 619                 }
 620         }
 621         client->request.clear();
 622
 623         return 200;  // OK!
 624 }
 625
 626 void Server::construct_header(Client *client)
 627 {
 628         client->header_or_error = find_stream(client->stream_id)->header;
 629
 630         // Switch states.
 631         client->state = Client::SENDING_HEADER;
 632
 633         epoll_event ev;
 634         ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
 635         ev.data.u64 = 0;  // Keep Valgrind happy.
 636         ev.data.fd = client->sock;
 637
 638         if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
 639                 perror("epoll_ctl(EPOLL_CTL_MOD)");
 640                 exit(1);
 641         }
 642 }
 643
 644 void Server::construct_error(Client *client, int error_code)
 645 {
 646         char error[256];
 647         snprintf(error, 256, "HTTP/1.0 %d Error\r\nContent-type: text/plain\r\n\r\nSomething went wrong. Sorry.\r\n",
 648                 error_code);
 649         client->header_or_error = error;
 650
 651         // Switch states.
 652         client->state = Client::SENDING_ERROR;
 653
 654         epoll_event ev;
 655         ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
 656         ev.data.u64 = 0;  // Keep Valgrind happy.
 657         ev.data.fd = client->sock;
 658
 659         if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
 660                 perror("epoll_ctl(EPOLL_CTL_MOD)");
 661                 exit(1);
 662         }
 663 }
 664
 665 template<class T>
 666 void delete_from(vector<T> *v, T elem)
 667 {
 668         typename vector<T>::iterator new_end = remove(v->begin(), v->end(), elem);
 669         v->erase(new_end, v->end());
 670 }
 671
 672 void Server::close_client(Client *client)
 673 {
 674         if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->sock, NULL) == -1) {
 675                 perror("epoll_ctl(EPOLL_CTL_DEL)");
 676                 exit(1);
 677         }
 678
 679         // This client could be sleeping, so we'll need to fix that. (Argh, O(n).)
 680         if (client->stream != NULL) {
 681                 delete_from(&client->stream->sleeping_clients, client);
 682                 delete_from(&client->stream->to_process, client);
 683                 if (client->stream->mark_pool != NULL) {
 684                         int fwmark = client->fwmark;
 685                         client->stream->mark_pool->release_mark(fwmark);
 686                 }
 687         }
 688
 689         // Bye-bye!
 690         int ret;
 691         do {
 692                 ret = close(client->sock);
 693         } while (ret == -1 && errno == EINTR);
 694
 695         if (ret == -1) {
 696                 perror("close");
 697         }
 698
 699         clients.erase(client->sock);
 700 }
 701
 702 Stream *Server::find_stream(const string &stream_id)
 703 {
 704         map<string, Stream *>::iterator it = streams.find(stream_id);
 705         assert(it != streams.end());
 706         return it->second;
 707 }
 708
 709 void Server::process_queued_data()
 710 {
 711         MutexLock lock(&queued_data_mutex);
 712
 713         for (size_t i = 0; i < queued_add_clients.size(); ++i) {
 714                 add_client(queued_add_clients[i]);
 715         }
 716         queued_add_clients.clear();
 717
 718         for (map<string, string>::iterator queued_it = queued_data.begin();
 719              queued_it != queued_data.end();
 720              ++queued_it) {
 721                 add_data(queued_it->first, queued_it->second.data(), queued_it->second.size());
 722         }
 723         queued_data.clear();
 724 }