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

   1 #include <assert.h>
   2 #include <errno.h>
   3 #include <netdb.h>
   4 #include <netinet/in.h>
   5 #include <poll.h>
   6 #include <stdint.h>
   7 #include <stdlib.h>
   8 #include <string.h>
   9 #include <sys/ioctl.h>
  10 #include <sys/socket.h>
  11 #include <sys/time.h>
  12 #include <time.h>
  13 #include <unistd.h>
  14 #include <map>
  15 #include <string>
  16 #include <utility>
  17 #include <vector>
  18
  19 #include "httpinput.h"
  20 #include "log.h"
  21 #include "metacube2.h"
  22 #include "mutexlock.h"
  23 #include "parse.h"
  24 #include "serverpool.h"
  25 #include "state.pb.h"
  26 #include "stream.h"
  27 #include "timespec.h"
  28 #include "util.h"
  29 #include "version.h"
  30
  31 using namespace std;
  32
  33 namespace {
  34
  35 string host_header(const string &host, const string &port)
  36 {
  37         if (port == "http" || atoi(port.c_str()) == 80) {
  38                 return host;
  39         } else {
  40                 return host + ":" + port;
  41         }
  42 }
  43
  44 }  // namespace
  45
  46 extern ServerPool *servers;
  47
  48 HTTPInput::HTTPInput(const string &url, Input::Encoding encoding)
  49         : state(NOT_CONNECTED),
  50           url(url),
  51           encoding(encoding),
  52           has_metacube_header(false),
  53           sock(-1),
  54           num_connection_attempts(0),
  55           suppress_logging(false)
  56 {
  57         pthread_mutex_init(&stats_mutex, NULL);
  58         stats.url = url;
  59         stats.bytes_received = 0;
  60         stats.data_bytes_received = 0;
  61         stats.connect_time = -1;
  62
  63         last_verbose_connection.tv_sec = -3600;
  64         last_verbose_connection.tv_nsec = 0;
  65 }
  66
  67 HTTPInput::HTTPInput(const InputProto &serialized)
  68         : state(State(serialized.state())),
  69           url(serialized.url()),
  70           encoding(serialized.is_metacube_encoded() ?
  71                    Input::INPUT_ENCODING_METACUBE :
  72                    Input::INPUT_ENCODING_RAW),
  73           request(serialized.request()),
  74           request_bytes_sent(serialized.request_bytes_sent()),
  75           response(serialized.response()),
  76           http_header(serialized.http_header()),
  77           stream_header(serialized.stream_header()),
  78           has_metacube_header(serialized.has_metacube_header()),
  79           sock(serialized.sock()),
  80           num_connection_attempts(0),
  81           suppress_logging(false)
  82 {
  83         pending_data.resize(serialized.pending_data().size());
  84         memcpy(&pending_data[0], serialized.pending_data().data(), serialized.pending_data().size());
  85
  86         string protocol, user;
  87         parse_url(url, &protocol, &user, &host, &port, &path);  // Don't care if it fails.
  88
  89         pthread_mutex_init(&stats_mutex, NULL);
  90         stats.url = url;
  91         stats.bytes_received = serialized.bytes_received();
  92         stats.data_bytes_received = serialized.data_bytes_received();
  93         if (serialized.has_connect_time()) {
  94                 stats.connect_time = serialized.connect_time();
  95         } else {
  96                 stats.connect_time = time(NULL);
  97         }
  98
  99         last_verbose_connection.tv_sec = -3600;
 100         last_verbose_connection.tv_nsec = 0;
 101 }
 102
 103 void HTTPInput::close_socket()
 104 {
 105         if (sock != -1) {
 106                 safe_close(sock);
 107                 sock = -1;
 108         }
 109
 110         MutexLock lock(&stats_mutex);
 111         stats.connect_time = -1;
 112 }
 113
 114 InputProto HTTPInput::serialize() const
 115 {
 116         InputProto serialized;
 117         serialized.set_state(state);
 118         serialized.set_url(url);
 119         serialized.set_request(request);
 120         serialized.set_request_bytes_sent(request_bytes_sent);
 121         serialized.set_response(response);
 122         serialized.set_http_header(http_header);
 123         serialized.set_stream_header(stream_header);
 124         serialized.set_pending_data(string(pending_data.begin(), pending_data.end()));
 125         serialized.set_has_metacube_header(has_metacube_header);
 126         serialized.set_sock(sock);
 127         serialized.set_bytes_received(stats.bytes_received);
 128         serialized.set_data_bytes_received(stats.data_bytes_received);
 129         serialized.set_connect_time(stats.connect_time);
 130         if (encoding == Input::INPUT_ENCODING_METACUBE) {
 131                 serialized.set_is_metacube_encoded(true);
 132         } else {
 133                 assert(encoding == Input::INPUT_ENCODING_RAW);
 134                 serialized.set_is_metacube_encoded(false);
 135         }
 136         return serialized;
 137 }
 138
 139 int HTTPInput::lookup_and_connect(const string &host, const string &port)
 140 {
 141         addrinfo *ai;
 142         int err = getaddrinfo(host.c_str(), port.c_str(), NULL, &ai);
 143         if (err != 0) {
 144                 if (!suppress_logging) {
 145                         log(WARNING, "[%s] Lookup of '%s' failed (%s).",
 146                                 url.c_str(), host.c_str(), gai_strerror(err));
 147                 }
 148                 return -1;
 149         }
 150
 151         addrinfo *base_ai = ai;
 152
 153         // Connect to everything in turn until we have a socket.
 154         for ( ; ai && !should_stop(); ai = ai->ai_next) {
 155                 int sock = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
 156                 if (sock == -1) {
 157                         // Could be e.g. EPROTONOSUPPORT. The show must go on.
 158                         continue;
 159                 }
 160
 161                 // Now do a non-blocking connect. This is important because we want to be able to be
 162                 // woken up, even though it's rather cumbersome.
 163
 164                 // Set the socket as nonblocking.
 165                 int one = 1;
 166                 if (ioctl(sock, FIONBIO, &one) == -1) {
 167                         log_perror("ioctl(FIONBIO)");
 168                         safe_close(sock);
 169                         return -1;
 170                 }
 171
 172                 // Do a non-blocking connect.
 173                 do {
 174                         err = connect(sock, ai->ai_addr, ai->ai_addrlen);
 175                 } while (err == -1 && errno == EINTR);
 176
 177                 if (err == -1 && errno != EINPROGRESS) {
 178                         log_perror("connect");
 179                         safe_close(sock);
 180                         continue;
 181                 }
 182
 183                 // Wait for the connect to complete, or an error to happen.
 184                 for ( ;; ) {
 185                         bool complete = wait_for_activity(sock, POLLIN | POLLOUT, NULL);
 186                         if (should_stop()) {
 187                                 safe_close(sock);
 188                                 return -1;
 189                         }
 190                         if (complete) {
 191                                 break;
 192                         }
 193                 }
 194
 195                 // Check whether it ended in an error or not.
 196                 socklen_t err_size = sizeof(err);
 197                 if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &err_size) == -1) {
 198                         log_perror("getsockopt");
 199                         safe_close(sock);
 200                         continue;
 201                 }
 202
 203                 errno = err;
 204
 205                 if (err == 0) {
 206                         // Successful connect.
 207                         freeaddrinfo(base_ai);
 208                         return sock;
 209                 }
 210
 211                 safe_close(sock);
 212         }
 213
 214         // Give the last one as error.
 215         if (!suppress_logging) {
 216                 log(WARNING, "[%s] Connect to '%s' failed (%s)",
 217                         url.c_str(), host.c_str(), strerror(errno));
 218         }
 219         freeaddrinfo(base_ai);
 220         return -1;
 221 }
 222
 223 bool HTTPInput::parse_response(const string &request)
 224 {
 225         vector<string> lines = split_lines(response);
 226         if (lines.empty()) {
 227                 if (!suppress_logging) {
 228                         log(WARNING, "[%s] Empty HTTP response from input.", url.c_str());
 229                 }
 230                 return false;
 231         }
 232
 233         vector<string> first_line_tokens = split_tokens(lines[0]);
 234         if (first_line_tokens.size() < 2) {
 235                 if (!suppress_logging) {
 236                         log(WARNING, "[%s] Malformed response line '%s' from input.",
 237                                 url.c_str(), lines[0].c_str());
 238                 }
 239                 return false;
 240         }
 241
 242         int response = atoi(first_line_tokens[1].c_str());
 243         if (response != 200) {
 244                 if (!suppress_logging) {
 245                         log(WARNING, "[%s] Non-200 response '%s' from input.",
 246                                 url.c_str(), lines[0].c_str());
 247                 }
 248                 return false;
 249         }
 250
 251         multimap<string, string> parameters = extract_headers(lines, url);
 252
 253         // Remove “Content-encoding: metacube”.
 254         // TODO: Make case-insensitive.
 255         multimap<string, string>::iterator encoding_it =
 256                 parameters.find("Content-encoding");
 257         if (encoding_it != parameters.end() && encoding_it->second == "metacube") {
 258                 parameters.erase(encoding_it);
 259         }
 260
 261         // Change “Server: foo” to “Server: metacube/0.1 (reflecting: foo)”
 262         // TODO: Make case-insensitive.
 263         // XXX: Use a Via: instead?
 264         if (parameters.count("Server") == 0) {
 265                 parameters.insert(make_pair("Server", SERVER_IDENTIFICATION));
 266         } else {
 267                 for (multimap<string, string>::iterator it = parameters.begin();
 268                      it != parameters.end();
 269                      ++it) {
 270                         if (it->first != "Server") {
 271                                 continue;
 272                         }
 273                         it->second = SERVER_IDENTIFICATION " (reflecting: " + it->second + ")";
 274                 }
 275         }
 276
 277         // Set “Connection: close”.
 278         // TODO: Make case-insensitive.
 279         parameters.erase("Connection");
 280         parameters.insert(make_pair("Connection", "close"));
 281
 282         // Construct the new HTTP header.
 283         http_header = "HTTP/1.0 200 OK\r\n";
 284         for (multimap<string, string>::iterator it = parameters.begin();
 285              it != parameters.end();
 286              ++it) {
 287                 http_header.append(it->first + ": " + it->second + "\r\n");
 288         }
 289
 290         for (size_t i = 0; i < stream_indices.size(); ++i) {
 291                 servers->set_header(stream_indices[i], http_header, stream_header);
 292         }
 293
 294         return true;
 295 }
 296
 297 void HTTPInput::do_work()
 298 {
 299         timespec last_activity;
 300
 301         // TODO: Make the timeout persist across restarts.
 302         if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
 303                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
 304                 assert(err != -1);
 305         }
 306
 307         while (!should_stop()) {
 308                 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
 309                         // Give the socket 30 seconds since last activity before we time out.
 310                         static const int timeout_secs = 30;
 311
 312                         timespec now;
 313                         int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &now);
 314                         assert(err != -1);
 315
 316                         timespec elapsed = clock_diff(last_activity, now);
 317                         if (elapsed.tv_sec >= timeout_secs) {
 318                                 // Timeout!
 319                                 if (!suppress_logging) {
 320                                         log(ERROR, "[%s] Timeout after %d seconds, closing.", url.c_str(), elapsed.tv_sec);
 321                                 }
 322                                 state = CLOSING_SOCKET;
 323                                 continue;
 324                         }
 325
 326                         // Basically calculate (30 - (now - last_activity)) = (30 + (last_activity - now)).
 327                         // Add a second of slack to account for differences between clocks.
 328                         timespec timeout = clock_diff(now, last_activity);
 329                         timeout.tv_sec += timeout_secs + 1;
 330                         assert(timeout.tv_sec > 0 || (timeout.tv_sec >= 0 && timeout.tv_nsec > 0));
 331
 332                         bool activity = wait_for_activity(sock, (state == SENDING_REQUEST) ? POLLOUT : POLLIN, &timeout);
 333                         if (activity) {
 334                                 err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
 335                                 assert(err != -1);
 336                         } else {
 337                                 // OK. Most likely, should_stop was set, or we have timed out.
 338                                 continue;
 339                         }
 340                 }
 341
 342                 switch (state) {
 343                 case NOT_CONNECTED:
 344                         request.clear();
 345                         request_bytes_sent = 0;
 346                         response.clear();
 347                         pending_data.clear();
 348                         has_metacube_header = false;
 349                         for (size_t i = 0; i < stream_indices.size(); ++i) {
 350                                 servers->set_header(stream_indices[i], "", "");
 351                         }
 352
 353                         {
 354                                 string protocol, user;  // Thrown away.
 355                                 if (!parse_url(url, &protocol, &user, &host, &port, &path)) {
 356                                         if (!suppress_logging) {
 357                                                 log(WARNING, "[%s] Failed to parse URL '%s'", url.c_str(), url.c_str());
 358                                         }
 359                                         break;
 360                                 }
 361
 362                                 // Remove the brackets around IPv6 address literals.
 363                                 // TODO: See if we can join this with the code in parse_ip_address(),
 364                                 // or maybe even more it into parse_url().
 365                                 if (!host.empty() && host[0] == '[' && host[host.size() - 1] == ']') {
 366                                         host = host.substr(1, host.size() - 2);
 367                                 }
 368                         }
 369
 370                         if (suppress_logging) {
 371                                 // See if there's more than one minute since last time we made a connection
 372                                 // with logging enabled. If so, turn it on again.
 373                                 timespec now;
 374                                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &now);
 375                                 assert(err != -1);
 376
 377                                 double elapsed = now.tv_sec - last_verbose_connection.tv_sec +
 378                                         1e-9 * (now.tv_nsec - last_verbose_connection.tv_nsec);
 379                                 if (elapsed > 60.0) {
 380                                         suppress_logging = false;
 381                                 }
 382                         }
 383                         if (!suppress_logging) {
 384                                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_verbose_connection);
 385                                 assert(err != -1);
 386                         }
 387                         ++num_connection_attempts;
 388                         sock = lookup_and_connect(host, port);
 389                         if (sock != -1) {
 390                                 // Yay, successful connect. Try to set it as nonblocking.
 391                                 int one = 1;
 392                                 if (ioctl(sock, FIONBIO, &one) == -1) {
 393                                         log_perror("ioctl(FIONBIO)");
 394                                         state = CLOSING_SOCKET;
 395                                 } else {
 396                                         state = SENDING_REQUEST;
 397                                         request = "GET " + path + " HTTP/1.0\r\nHost: " + host_header(host, port) + "\r\nUser-Agent: cubemap\r\n\r\n";
 398                                         request_bytes_sent = 0;
 399                                 }
 400
 401                                 MutexLock lock(&stats_mutex);
 402                                 stats.connect_time = time(NULL);
 403                                 clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
 404                         }
 405                         break;
 406                 case SENDING_REQUEST: {
 407                         size_t to_send = request.size() - request_bytes_sent;
 408                         int ret;
 409
 410                         do {
 411                                 ret = write(sock, request.data() + request_bytes_sent, to_send);
 412                         } while (ret == -1 && errno == EINTR);
 413
 414                         if (ret == -1) {
 415                                 log_perror("write");
 416                                 state = CLOSING_SOCKET;
 417                                 continue;
 418                         }
 419
 420                         assert(ret >= 0);
 421                         request_bytes_sent += ret;
 422
 423                         if (request_bytes_sent == request.size()) {
 424                                 state = RECEIVING_HEADER;
 425                         }
 426                         break;
 427                 }
 428                 case RECEIVING_HEADER: {
 429                         char buf[4096];
 430                         int ret;
 431
 432                         do {
 433                                 ret = read(sock, buf, sizeof(buf));
 434                         } while (ret == -1 && errno == EINTR);
 435
 436                         if (ret == -1) {
 437                                 log_perror("read");
 438                                 state = CLOSING_SOCKET;
 439                                 continue;
 440                         }
 441
 442                         if (ret == 0) {
 443                                 // This really shouldn't happen...
 444                                 if (!suppress_logging) {
 445                                         log(ERROR, "[%s] Socket unexpectedly closed while reading header",
 446                                                    url.c_str());
 447                                 }
 448                                 state = CLOSING_SOCKET;
 449                                 continue;
 450                         }
 451
 452                         RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
 453
 454                         if (status == RP_OUT_OF_SPACE) {
 455                                 if (!suppress_logging) {
 456                                         log(WARNING, "[%s] Server sent overlong HTTP response!", url.c_str());
 457                                 }
 458                                 state = CLOSING_SOCKET;
 459                                 continue;
 460                         } else if (status == RP_NOT_FINISHED_YET) {
 461                                 continue;
 462                         }
 463
 464                         // OK, so we're fine, but there might be some of the actual data after the response.
 465                         // We'll need to deal with that separately.
 466                         string extra_data;
 467                         if (status == RP_EXTRA_DATA) {
 468                                 char *ptr = static_cast<char *>(
 469                                         memmem(response.data(), response.size(), "\r\n\r\n", 4));
 470                                 assert(ptr != NULL);
 471                                 extra_data = string(ptr + 4, &response[0] + response.size());
 472                                 response.resize(ptr - response.data());
 473                         }
 474
 475                         if (!parse_response(response)) {
 476                                 state = CLOSING_SOCKET;
 477                                 continue;
 478                         }
 479
 480                         if (!extra_data.empty()) {
 481                                 process_data(&extra_data[0], extra_data.size());
 482                         }
 483
 484                         if (!suppress_logging) {
 485                                 if (encoding == Input::INPUT_ENCODING_RAW) {
 486                                         log(INFO, "[%s] Connected to '%s', receiving raw data.",
 487                                                    url.c_str(), url.c_str());
 488                                 } else {
 489                                         assert(encoding == Input::INPUT_ENCODING_METACUBE);
 490                                         log(INFO, "[%s] Connected to '%s', receiving data.",
 491                                                    url.c_str(), url.c_str());
 492                                 }
 493                         }
 494                         state = RECEIVING_DATA;
 495                         break;
 496                 }
 497                 case RECEIVING_DATA: {
 498                         char buf[4096];
 499                         int ret;
 500
 501                         do {
 502                                 ret = read(sock, buf, sizeof(buf));
 503                         } while (ret == -1 && errno == EINTR);
 504
 505                         if (ret == -1) {
 506                                 log_perror("read");
 507                                 state = CLOSING_SOCKET;
 508                                 continue;
 509                         }
 510
 511                         if (ret == 0) {
 512                                 // This really shouldn't happen...
 513                                 if (!suppress_logging) {
 514                                         log(ERROR, "[%s] Socket unexpectedly closed while reading data",
 515                                                    url.c_str());
 516                                 }
 517                                 state = CLOSING_SOCKET;
 518                                 continue;
 519                         }
 520
 521                         num_connection_attempts = 0;  // Reset, since we have a successful read.
 522                         if (suppress_logging) {
 523                                 // This was suppressed earlier, so print it out now.
 524                                 if (encoding == Input::INPUT_ENCODING_RAW) {
 525                                         log(INFO, "[%s] Connected to '%s', receiving raw data.",
 526                                                    url.c_str(), url.c_str());
 527                                 } else {
 528                                         assert(encoding == Input::INPUT_ENCODING_METACUBE);
 529                                         log(INFO, "[%s] Connected to '%s', receiving data.",
 530                                                    url.c_str(), url.c_str());
 531                                 }
 532                                 suppress_logging = false;
 533                         }
 534
 535                         process_data(buf, ret);
 536                         break;
 537                 }
 538                 case CLOSING_SOCKET: {
 539                         close_socket();
 540                         state = NOT_CONNECTED;
 541                         break;
 542                 }
 543                 default:
 544                         assert(false);
 545                 }
 546
 547                 // If we are still in NOT_CONNECTED, either something went wrong,
 548                 // or the connection just got closed.
 549                 // The earlier steps have already given the error message, if any.
 550                 if (state == NOT_CONNECTED && !should_stop()) {
 551                         if (!suppress_logging) {
 552                                 log(INFO, "[%s] Waiting 0.2 seconds and restarting...", url.c_str());
 553                         }
 554
 555                         if (num_connection_attempts >= 3 && !suppress_logging) {
 556                                 log(INFO, "[%s] %d failed connection attempts, suppressing logging for one minute.",
 557                                         url.c_str(), num_connection_attempts);
 558                                 suppress_logging = true;
 559                         }
 560                         timespec timeout_ts;
 561                         timeout_ts.tv_sec = 0;
 562                         timeout_ts.tv_nsec = 200000000;
 563                         wait_for_wakeup(&timeout_ts);
 564                 }
 565         }
 566 }
 567
 568 void HTTPInput::process_data(char *ptr, size_t bytes)
 569 {
 570         {
 571                 MutexLock mutex(&stats_mutex);
 572                 stats.bytes_received += bytes;
 573         }
 574
 575         if (encoding == Input::INPUT_ENCODING_RAW) {
 576                 for (size_t i = 0; i < stream_indices.size(); ++i) {
 577                         servers->add_data(stream_indices[i], ptr, bytes, /*metacube_flags=*/0);
 578                 }
 579                 return;
 580         }
 581
 582         assert(encoding == Input::INPUT_ENCODING_METACUBE);
 583         pending_data.insert(pending_data.end(), ptr, ptr + bytes);
 584
 585         for ( ;; ) {
 586                 // If we don't have enough data (yet) for even the Metacube header, just return.
 587                 if (pending_data.size() < sizeof(metacube2_block_header)) {
 588                         return;
 589                 }
 590
 591                 // Make sure we have the Metacube sync header at the start.
 592                 // We may need to skip over junk data (it _should_ not happen, though).
 593                 if (!has_metacube_header) {
 594                         char *ptr = static_cast<char *>(
 595                                 memmem(pending_data.data(), pending_data.size(),
 596                                        METACUBE2_SYNC, strlen(METACUBE2_SYNC)));
 597                         if (ptr == NULL) {
 598                                 // OK, so we didn't find the sync marker. We know then that
 599                                 // we do not have the _full_ marker in the buffer, but we
 600                                 // could have N-1 bytes. Drop everything before that,
 601                                 // and then give up.
 602                                 drop_pending_data(pending_data.size() - (strlen(METACUBE2_SYNC) - 1));
 603                                 return;
 604                         } else {
 605                                 // Yay, we found the header. Drop everything (if anything) before it.
 606                                 drop_pending_data(ptr - pending_data.data());
 607                                 has_metacube_header = true;
 608
 609                                 // Re-check that we have the entire header; we could have dropped data.
 610                                 if (pending_data.size() < sizeof(metacube2_block_header)) {
 611                                         return;
 612                                 }
 613                         }
 614                 }
 615
 616                 // Now it's safe to read the header.
 617                 metacube2_block_header hdr;
 618                 memcpy(&hdr, pending_data.data(), sizeof(hdr));
 619                 assert(memcmp(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync)) == 0);
 620                 uint32_t size = ntohl(hdr.size);
 621                 uint16_t flags = ntohs(hdr.flags);
 622                 uint16_t expected_csum = metacube2_compute_crc(&hdr);
 623
 624                 if (expected_csum != ntohs(hdr.csum)) {
 625                         log(WARNING, "[%s] Metacube checksum failed (expected 0x%x, got 0x%x), "
 626                                 "not reading block claiming to be %d bytes (flags=%x).",
 627                                 url.c_str(), expected_csum, ntohs(hdr.csum),
 628                                 size, flags);
 629
 630                         // Drop only the first byte, and let the rest of the code handle resync.
 631                         pending_data.erase(pending_data.begin(), pending_data.begin() + 1);
 632                         has_metacube_header = false;
 633                         continue;
 634                 }
 635                 if (size > 10485760) {
 636                         log(WARNING, "[%s] Metacube block of %d bytes (flags=%x); corrupted header??",
 637                                 url.c_str(), size, flags);
 638                 }
 639
 640                 // See if we have the entire block. If not, wait for more data.
 641                 if (pending_data.size() < sizeof(metacube2_block_header) + size) {
 642                         return;
 643                 }
 644
 645                 // Send this block on to the servers.
 646                 {
 647                         MutexLock lock(&stats_mutex);
 648                         stats.data_bytes_received += size;
 649                 }
 650                 char *inner_data = pending_data.data() + sizeof(metacube2_block_header);
 651                 if (flags & METACUBE_FLAGS_HEADER) {
 652                         stream_header = string(inner_data, inner_data + size);
 653                         for (size_t i = 0; i < stream_indices.size(); ++i) {
 654                                 servers->set_header(stream_indices[i], http_header, stream_header);
 655                         }
 656                 }
 657                 for (size_t i = 0; i < stream_indices.size(); ++i) {
 658                         servers->add_data(stream_indices[i], inner_data, size, flags);
 659                 }
 660
 661                 // Consume the block. This isn't the most efficient way of dealing with things
 662                 // should we have many blocks, but these routines don't need to be too efficient
 663                 // anyway.
 664                 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube2_block_header) + size);
 665                 has_metacube_header = false;
 666         }
 667 }
 668
 669 void HTTPInput::drop_pending_data(size_t num_bytes)
 670 {
 671         if (num_bytes == 0) {
 672                 return;
 673         }
 674         log(WARNING, "[%s] Dropping %lld junk bytes; not a Metacube2 stream, or data was dropped from the middle of the stream.",
 675                 url.c_str(), (long long)num_bytes);
 676         assert(pending_data.size() >= num_bytes);
 677         pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);
 678 }
 679
 680 void HTTPInput::add_destination(int stream_index)
 681 {
 682         stream_indices.push_back(stream_index);
 683         servers->set_header(stream_index, http_header, stream_header);
 684 }
 685
 686 InputStats HTTPInput::get_stats() const
 687 {
 688         MutexLock lock(&stats_mutex);
 689         return stats;
 690 }