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