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

   1 #include <assert.h>
   2 #include <errno.h>
   3 #include <math.h>
   4 #include <netdb.h>
   5 #include <netinet/in.h>
   6 #include <poll.h>
   7 #include <stdint.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <sys/ioctl.h>
  11 #include <sys/socket.h>
  12 #include <sys/time.h>
  13 #include <time.h>
  14 #include <unistd.h>
  15 #include <math.h>
  16 #include <map>
  17 #include <string>
  18 #include <utility>
  19 #include <vector>
  20
  21 #include "httpinput.h"
  22 #include "log.h"
  23 #include "metacube2.h"
  24 #include "parse.h"
  25 #include "serverpool.h"
  26 #include "state.pb.h"
  27 #include "stream.h"
  28 #include "timespec.h"
  29 #include "util.h"
  30 #include "version.h"
  31
  32 using namespace std;
  33
  34 namespace {
  35
  36 string host_header(const string &host, const string &port)
  37 {
  38         if (port == "http" || atoi(port.c_str()) == 80) {
  39                 return host;
  40         } else {
  41                 return host + ":" + port;
  42         }
  43 }
  44
  45 }  // namespace
  46
  47 extern ServerPool *servers;
  48
  49 HTTPInput::HTTPInput(const string &url, Input::Encoding encoding)
  50         : state(NOT_CONNECTED),
  51           url(url),
  52           encoding(encoding)
  53 {
  54         stats.url = url;
  55         stats.bytes_received = 0;
  56         stats.data_bytes_received = 0;
  57         stats.metadata_bytes_received = 0;
  58         stats.connect_time = -1;
  59         stats.latency_sec = HUGE_VAL;
  60 }
  61
  62 HTTPInput::HTTPInput(const InputProto &serialized)
  63         : state(State(serialized.state())),
  64           url(serialized.url()),
  65           encoding(serialized.is_metacube_encoded() ?
  66                    Input::INPUT_ENCODING_METACUBE :
  67                    Input::INPUT_ENCODING_RAW),
  68           request(serialized.request()),
  69           request_bytes_sent(serialized.request_bytes_sent()),
  70           response(serialized.response()),
  71           http_header(serialized.http_header()),
  72           stream_header(serialized.stream_header()),
  73           has_metacube_header(serialized.has_metacube_header()),
  74           sock(serialized.sock())
  75 {
  76         pending_data.resize(serialized.pending_data().size());
  77         memcpy(&pending_data[0], serialized.pending_data().data(), serialized.pending_data().size());
  78
  79         string protocol, user;
  80         parse_url(url, &protocol, &user, &host, &port, &path);  // Don't care if it fails.
  81
  82         stats.url = url;
  83         stats.bytes_received = serialized.bytes_received();
  84         stats.data_bytes_received = serialized.data_bytes_received();
  85         stats.metadata_bytes_received = serialized.metadata_bytes_received();
  86         if (serialized.has_connect_time()) {
  87                 stats.connect_time = serialized.connect_time();
  88         } else {
  89                 stats.connect_time = time(nullptr);
  90         }
  91         if (serialized.has_latency_sec()) {
  92                 stats.latency_sec = serialized.latency_sec();
  93         } else {
  94                 stats.latency_sec = HUGE_VAL;
  95         }
  96
  97         last_verbose_connection.tv_sec = -3600;
  98         last_verbose_connection.tv_nsec = 0;
  99 }
 100
 101 void HTTPInput::close_socket()
 102 {
 103         if (sock != -1) {
 104                 safe_close(sock);
 105                 sock = -1;
 106         }
 107
 108         lock_guard<mutex> lock(stats_mutex);
 109         stats.connect_time = -1;
 110 }
 111
 112 InputProto HTTPInput::serialize() const
 113 {
 114         InputProto serialized;
 115         serialized.set_state(state);
 116         serialized.set_url(url);
 117         serialized.set_request(request);
 118         serialized.set_request_bytes_sent(request_bytes_sent);
 119         serialized.set_response(response);
 120         serialized.set_http_header(http_header);
 121         serialized.set_stream_header(stream_header);
 122         serialized.set_pending_data(string(pending_data.begin(), pending_data.end()));
 123         serialized.set_has_metacube_header(has_metacube_header);
 124         serialized.set_sock(sock);
 125         serialized.set_bytes_received(stats.bytes_received);
 126         serialized.set_data_bytes_received(stats.data_bytes_received);
 127         if (isfinite(stats.latency_sec)) {
 128                 serialized.set_latency_sec(stats.latency_sec);
 129         }
 130         serialized.set_connect_time(stats.connect_time);
 131         if (encoding == Input::INPUT_ENCODING_METACUBE) {
 132                 serialized.set_is_metacube_encoded(true);
 133         } else {
 134                 assert(encoding == Input::INPUT_ENCODING_RAW);
 135                 serialized.set_is_metacube_encoded(false);
 136         }
 137         return serialized;
 138 }
 139
 140 int HTTPInput::lookup_and_connect(const string &host, const string &port)
 141 {
 142         addrinfo *ai;
 143         int err = getaddrinfo(host.c_str(), port.c_str(), nullptr, &ai);
 144         if (err != 0) {
 145                 if (!suppress_logging) {
 146                         log(WARNING, "[%s] Lookup of '%s' failed (%s).",
 147                                 url.c_str(), host.c_str(), gai_strerror(err));
 148                 }
 149                 return -1;
 150         }
 151
 152         addrinfo *base_ai = ai;
 153
 154         // Connect to everything in turn until we have a socket.
 155         for ( ; ai && !should_stop(); ai = ai->ai_next) {
 156                 // Now do a non-blocking connect. This is important because we want to be able to be
 157                 // woken up, even though it's rather cumbersome.
 158                 int sock = socket(ai->ai_family, SOCK_STREAM | SOCK_NONBLOCK, IPPROTO_TCP);
 159                 if (sock == -1) {
 160                         // Could be e.g. EPROTONOSUPPORT. The show must go on.
 161                         continue;
 162                 }
 163
 164                 // Do a non-blocking connect.
 165                 do {
 166                         err = connect(sock, ai->ai_addr, ai->ai_addrlen);
 167                 } while (err == -1 && errno == EINTR);
 168
 169                 if (err == -1 && errno != EINPROGRESS) {
 170                         log_perror("connect");
 171                         safe_close(sock);
 172                         continue;
 173                 }
 174
 175                 // Wait for the connect to complete, or an error to happen.
 176                 for ( ;; ) {
 177                         bool complete = wait_for_activity(sock, POLLIN | POLLOUT, nullptr);
 178                         if (should_stop()) {
 179                                 safe_close(sock);
 180                                 return -1;
 181                         }
 182                         if (complete) {
 183                                 break;
 184                         }
 185                 }
 186
 187                 // Check whether it ended in an error or not.
 188                 socklen_t err_size = sizeof(err);
 189                 if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &err_size) == -1) {
 190                         log_perror("getsockopt");
 191                         safe_close(sock);
 192                         continue;
 193                 }
 194
 195                 errno = err;
 196
 197                 if (err == 0) {
 198                         // Successful connect.
 199                         freeaddrinfo(base_ai);
 200                         return sock;
 201                 }
 202
 203                 safe_close(sock);
 204         }
 205
 206         // Give the last one as error.
 207         if (!suppress_logging) {
 208                 log(WARNING, "[%s] Connect to '%s' failed (%s)",
 209                         url.c_str(), host.c_str(), strerror(errno));
 210         }
 211         freeaddrinfo(base_ai);
 212         return -1;
 213 }
 214
 215 bool HTTPInput::parse_response(const string &request)
 216 {
 217         vector<string> lines = split_lines(response);
 218         if (lines.empty()) {
 219                 if (!suppress_logging) {
 220                         log(WARNING, "[%s] Empty HTTP response from input.", url.c_str());
 221                 }
 222                 return false;
 223         }
 224
 225         vector<string> first_line_tokens = split_tokens(lines[0]);
 226         if (first_line_tokens.size() < 2) {
 227                 if (!suppress_logging) {
 228                         log(WARNING, "[%s] Malformed response line '%s' from input.",
 229                                 url.c_str(), lines[0].c_str());
 230                 }
 231                 return false;
 232         }
 233
 234         int response = atoi(first_line_tokens[1].c_str());
 235         if (response != 200) {
 236                 if (!suppress_logging) {
 237                         log(WARNING, "[%s] Non-200 response '%s' from input.",
 238                                 url.c_str(), lines[0].c_str());
 239                 }
 240                 return false;
 241         }
 242
 243         HTTPHeaderMultimap parameters = extract_headers(lines, url);
 244
 245         // Remove “Content-encoding: metacube”.
 246         const auto encoding_it = parameters.find("Content-Encoding");
 247         if (encoding_it != parameters.end() && encoding_it->second == "metacube") {
 248                 parameters.erase(encoding_it);
 249         }
 250
 251         // Change “Server: foo” to “Server: metacube/0.1 (reflecting: foo)”
 252         // XXX: Use a Via: instead?
 253         if (parameters.count("Server") == 0) {
 254                 parameters.insert(make_pair("Server", SERVER_IDENTIFICATION));
 255         } else {
 256                 for (auto &key_and_value : parameters) {
 257                         if (key_and_value.first != "Server") {
 258                                 continue;
 259                         }
 260                         key_and_value.second = SERVER_IDENTIFICATION " (reflecting: " + key_and_value.second + ")";
 261                 }
 262         }
 263
 264         // Erase “Connection: close”; we'll set it on the sending side if needed.
 265         parameters.erase("Connection");
 266
 267         // Construct the new HTTP header.
 268         http_header = "HTTP/1.0 200 OK\r\n";
 269         for (const auto &key_and_value : parameters) {
 270                 http_header.append(key_and_value.first + ": " + key_and_value.second + "\r\n");
 271         }
 272
 273         for (int stream_index : stream_indices) {
 274                 servers->set_header(stream_index, http_header, stream_header);
 275         }
 276
 277         return true;
 278 }
 279
 280 void HTTPInput::do_work()
 281 {
 282         timespec last_activity;
 283
 284         // TODO: Make the timeout persist across restarts.
 285         if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
 286                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
 287                 assert(err != -1);
 288         }
 289
 290         while (!should_stop()) {
 291                 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
 292                         // Give the socket 30 seconds since last activity before we time out.
 293                         static const int timeout_secs = 30;
 294
 295                         timespec now;
 296                         int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &now);
 297                         assert(err != -1);
 298
 299                         timespec elapsed = clock_diff(last_activity, now);
 300                         if (elapsed.tv_sec >= timeout_secs) {
 301                                 // Timeout!
 302                                 if (!suppress_logging) {
 303                                         log(ERROR, "[%s] Timeout after %d seconds, closing.", url.c_str(), elapsed.tv_sec);
 304                                 }
 305                                 state = CLOSING_SOCKET;
 306                                 continue;
 307                         }
 308
 309                         // Basically calculate (30 - (now - last_activity)) = (30 + (last_activity - now)).
 310                         // Add a second of slack to account for differences between clocks.
 311                         timespec timeout = clock_diff(now, last_activity);
 312                         timeout.tv_sec += timeout_secs + 1;
 313                         assert(timeout.tv_sec > 0 || (timeout.tv_sec >= 0 && timeout.tv_nsec > 0));
 314
 315                         bool activity = wait_for_activity(sock, (state == SENDING_REQUEST) ? POLLOUT : POLLIN, &timeout);
 316                         if (activity) {
 317                                 err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
 318                                 assert(err != -1);
 319                         } else {
 320                                 // OK. Most likely, should_stop was set, or we have timed out.
 321                                 continue;
 322                         }
 323                 }
 324
 325                 switch (state) {
 326                 case NOT_CONNECTED:
 327                         request.clear();
 328                         request_bytes_sent = 0;
 329                         response.clear();
 330                         pending_data.clear();
 331                         has_metacube_header = false;
 332                         for (int stream_index : stream_indices) {
 333                                 // Don't zero out the header; it might still be of use to HLS clients.
 334                                 servers->set_unavailable(stream_index);
 335                         }
 336
 337                         {
 338                                 string protocol, user;  // Thrown away.
 339                                 if (!parse_url(url, &protocol, &user, &host, &port, &path)) {
 340                                         if (!suppress_logging) {
 341                                                 log(WARNING, "[%s] Failed to parse URL '%s'", url.c_str(), url.c_str());
 342                                         }
 343                                         break;
 344                                 }
 345
 346                                 // Remove the brackets around IPv6 address literals.
 347                                 // TODO: See if we can join this with the code in parse_ip_address(),
 348                                 // or maybe even more it into parse_url().
 349                                 if (!host.empty() && host[0] == '[' && host[host.size() - 1] == ']') {
 350                                         host = host.substr(1, host.size() - 2);
 351                                 }
 352                         }
 353
 354                         if (suppress_logging) {
 355                                 // See if there's more than one minute since last time we made a connection
 356                                 // with logging enabled. If so, turn it on again.
 357                                 timespec now;
 358                                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &now);
 359                                 assert(err != -1);
 360
 361                                 double elapsed = now.tv_sec - last_verbose_connection.tv_sec +
 362                                         1e-9 * (now.tv_nsec - last_verbose_connection.tv_nsec);
 363                                 if (elapsed > 60.0) {
 364                                         suppress_logging = false;
 365                                 }
 366                         }
 367                         if (!suppress_logging) {
 368                                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_verbose_connection);
 369                                 assert(err != -1);
 370                         }
 371                         ++num_connection_attempts;
 372                         sock = lookup_and_connect(host, port);
 373                         if (sock != -1) {
 374                                 // Yay, successful connect.
 375                                 state = SENDING_REQUEST;
 376                                 request = "GET " + path + " HTTP/1.0\r\nHost: " + host_header(host, port) + "\r\nUser-Agent: cubemap\r\n\r\n";
 377                                 request_bytes_sent = 0;
 378
 379                                 lock_guard<mutex> lock(stats_mutex);
 380                                 stats.connect_time = time(nullptr);
 381                                 clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
 382                         }
 383                         break;
 384                 case SENDING_REQUEST: {
 385                         size_t to_send = request.size() - request_bytes_sent;
 386                         int ret;
 387
 388                         do {
 389                                 ret = write(sock, request.data() + request_bytes_sent, to_send);
 390                         } while (ret == -1 && errno == EINTR);
 391
 392                         if (ret == -1) {
 393                                 log_perror("write");
 394                                 state = CLOSING_SOCKET;
 395                                 continue;
 396                         }
 397
 398                         assert(ret >= 0);
 399                         request_bytes_sent += ret;
 400
 401                         if (request_bytes_sent == request.size()) {
 402                                 state = RECEIVING_HEADER;
 403                         }
 404                         break;
 405                 }
 406                 case RECEIVING_HEADER: {
 407                         char buf[4096];
 408                         int ret;
 409
 410                         do {
 411                                 ret = read(sock, buf, sizeof(buf));
 412                         } while (ret == -1 && errno == EINTR);
 413
 414                         if (ret == -1) {
 415                                 log_perror("read");
 416                                 state = CLOSING_SOCKET;
 417                                 continue;
 418                         }
 419
 420                         if (ret == 0) {
 421                                 // This really shouldn't happen...
 422                                 if (!suppress_logging) {
 423                                         log(ERROR, "[%s] Socket unexpectedly closed while reading header",
 424                                                    url.c_str());
 425                                 }
 426                                 state = CLOSING_SOCKET;
 427                                 continue;
 428                         }
 429
 430                         RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
 431
 432                         if (status == RP_OUT_OF_SPACE) {
 433                                 if (!suppress_logging) {
 434                                         log(WARNING, "[%s] Server sent overlong HTTP response!", url.c_str());
 435                                 }
 436                                 state = CLOSING_SOCKET;
 437                                 continue;
 438                         } else if (status == RP_NOT_FINISHED_YET) {
 439                                 continue;
 440                         }
 441
 442                         // OK, so we're fine, but there might be some of the actual data after the response.
 443                         // We'll need to deal with that separately.
 444                         string extra_data;
 445                         if (status == RP_EXTRA_DATA) {
 446                                 char *ptr = static_cast<char *>(
 447                                         memmem(response.data(), response.size(), "\r\n\r\n", 4));
 448                                 assert(ptr != nullptr);
 449                                 extra_data = string(ptr + 4, &response[0] + response.size());
 450                                 response.resize(ptr - response.data());
 451                         }
 452
 453                         if (!parse_response(response)) {
 454                                 state = CLOSING_SOCKET;
 455                                 continue;
 456                         }
 457
 458                         if (!extra_data.empty()) {
 459                                 process_data(&extra_data[0], extra_data.size());
 460                         }
 461
 462                         if (!suppress_logging) {
 463                                 if (encoding == Input::INPUT_ENCODING_RAW) {
 464                                         log(INFO, "[%s] Connected to '%s', receiving raw data.",
 465                                                    url.c_str(), url.c_str());
 466                                 } else {
 467                                         assert(encoding == Input::INPUT_ENCODING_METACUBE);
 468                                         log(INFO, "[%s] Connected to '%s', receiving data.",
 469                                                    url.c_str(), url.c_str());
 470                                 }
 471                         }
 472                         state = RECEIVING_DATA;
 473                         break;
 474                 }
 475                 case RECEIVING_DATA: {
 476                         char buf[4096];
 477                         int ret;
 478
 479                         do {
 480                                 ret = read(sock, buf, sizeof(buf));
 481                         } while (ret == -1 && errno == EINTR);
 482
 483                         if (ret == -1) {
 484                                 log_perror("read");
 485                                 state = CLOSING_SOCKET;
 486                                 continue;
 487                         }
 488
 489                         if (ret == 0) {
 490                                 // This really shouldn't happen...
 491                                 if (!suppress_logging) {
 492                                         log(ERROR, "[%s] Socket unexpectedly closed while reading data",
 493                                                    url.c_str());
 494                                 }
 495                                 state = CLOSING_SOCKET;
 496                                 continue;
 497                         }
 498
 499                         num_connection_attempts = 0;  // Reset, since we have a successful read.
 500                         if (suppress_logging) {
 501                                 // This was suppressed earlier, so print it out now.
 502                                 if (encoding == Input::INPUT_ENCODING_RAW) {
 503                                         log(INFO, "[%s] Connected to '%s', receiving raw data.",
 504                                                    url.c_str(), url.c_str());
 505                                 } else {
 506                                         assert(encoding == Input::INPUT_ENCODING_METACUBE);
 507                                         log(INFO, "[%s] Connected to '%s', receiving data.",
 508                                                    url.c_str(), url.c_str());
 509                                 }
 510                                 suppress_logging = false;
 511                         }
 512
 513                         process_data(buf, ret);
 514                         break;
 515                 }
 516                 case CLOSING_SOCKET: {
 517                         close_socket();
 518                         state = NOT_CONNECTED;
 519                         break;
 520                 }
 521                 default:
 522                         assert(false);
 523                 }
 524
 525                 // If we are still in NOT_CONNECTED, either something went wrong,
 526                 // or the connection just got closed.
 527                 // The earlier steps have already given the error message, if any.
 528                 if (state == NOT_CONNECTED && !should_stop()) {
 529                         if (!suppress_logging) {
 530                                 log(INFO, "[%s] Waiting 0.2 seconds and restarting...", url.c_str());
 531                         }
 532
 533                         if (num_connection_attempts >= 3 && !suppress_logging) {
 534                                 log(INFO, "[%s] %d failed connection attempts, suppressing logging for one minute.",
 535                                         url.c_str(), num_connection_attempts);
 536                                 suppress_logging = true;
 537                         }
 538                         timespec timeout_ts;
 539                         timeout_ts.tv_sec = 0;
 540                         timeout_ts.tv_nsec = 200000000;
 541                         wait_for_wakeup(&timeout_ts);
 542                 }
 543         }
 544 }
 545
 546 void HTTPInput::process_data(char *ptr, size_t bytes)
 547 {
 548         {
 549                 lock_guard<mutex> lock(stats_mutex);
 550                 stats.bytes_received += bytes;
 551         }
 552
 553         if (encoding == Input::INPUT_ENCODING_RAW) {
 554                 for (int stream_index : stream_indices) {
 555                         servers->add_data(stream_index, ptr, bytes, /*metacube_flags=*/0, /*pts=*/RationalPTS());
 556                 }
 557                 return;
 558         }
 559
 560         assert(encoding == Input::INPUT_ENCODING_METACUBE);
 561         pending_data.insert(pending_data.end(), ptr, ptr + bytes);
 562
 563         for ( ;; ) {
 564                 // If we don't have enough data (yet) for even the Metacube header, just return.
 565                 if (pending_data.size() < sizeof(metacube2_block_header)) {
 566                         return;
 567                 }
 568
 569                 // Make sure we have the Metacube sync header at the start.
 570                 // We may need to skip over junk data (it _should_ not happen, though).
 571                 if (!has_metacube_header) {
 572                         char *ptr = static_cast<char *>(
 573                                 memmem(pending_data.data(), pending_data.size(),
 574                                        METACUBE2_SYNC, strlen(METACUBE2_SYNC)));
 575                         if (ptr == nullptr) {
 576                                 // OK, so we didn't find the sync marker. We know then that
 577                                 // we do not have the _full_ marker in the buffer, but we
 578                                 // could have N-1 bytes. Drop everything before that,
 579                                 // and then give up.
 580                                 drop_pending_data(pending_data.size() - (strlen(METACUBE2_SYNC) - 1));
 581                                 return;
 582                         } else {
 583                                 // Yay, we found the header. Drop everything (if anything) before it.
 584                                 drop_pending_data(ptr - pending_data.data());
 585                                 has_metacube_header = true;
 586
 587                                 // Re-check that we have the entire header; we could have dropped data.
 588                                 if (pending_data.size() < sizeof(metacube2_block_header)) {
 589                                         return;
 590                                 }
 591                         }
 592                 }
 593
 594                 // Now it's safe to read the header.
 595                 metacube2_block_header hdr;
 596                 memcpy(&hdr, pending_data.data(), sizeof(hdr));
 597                 assert(memcmp(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync)) == 0);
 598                 uint32_t size = ntohl(hdr.size);
 599                 uint16_t flags = ntohs(hdr.flags);
 600                 uint16_t expected_csum = metacube2_compute_crc(&hdr);
 601
 602                 if (expected_csum != ntohs(hdr.csum)) {
 603                         log(WARNING, "[%s] Metacube checksum failed (expected 0x%x, got 0x%x), "
 604                                 "not reading block claiming to be %d bytes (flags=%x).",
 605                                 url.c_str(), expected_csum, ntohs(hdr.csum),
 606                                 size, flags);
 607
 608                         // Drop only the first byte, and let the rest of the code handle resync.
 609                         pending_data.erase(pending_data.begin(), pending_data.begin() + 1);
 610                         has_metacube_header = false;
 611                         continue;
 612                 }
 613                 if (size > 10485760) {
 614                         log(WARNING, "[%s] Metacube block of %d bytes (flags=%x); corrupted header??",
 615                                 url.c_str(), size, flags);
 616                 }
 617
 618                 // See if we have the entire block. If not, wait for more data.
 619                 if (pending_data.size() < sizeof(metacube2_block_header) + size) {
 620                         return;
 621                 }
 622
 623                 // See if this is a metadata block. If so, we don't want to send it on,
 624                 // but rather process it ourselves.
 625                 // TODO: Keep metadata when sending on to other Metacube users.
 626                 if (flags & METACUBE_FLAGS_METADATA) {
 627                         {
 628                                 lock_guard<mutex> lock(stats_mutex);
 629                                 stats.metadata_bytes_received += size;
 630                         }
 631                         process_metacube_metadata_block(hdr, pending_data.data() + sizeof(hdr), size);
 632                 } else {
 633                         // Send this block on to the servers.
 634                         {
 635                                 lock_guard<mutex> lock(stats_mutex);
 636                                 stats.data_bytes_received += size;
 637                         }
 638                         char *inner_data = pending_data.data() + sizeof(metacube2_block_header);
 639                         if (flags & METACUBE_FLAGS_HEADER) {
 640                                 stream_header = string(inner_data, inner_data + size);
 641                                 for (int stream_index : stream_indices) {
 642                                         servers->set_header(stream_index, http_header, stream_header);
 643                                 }
 644                         }
 645                         for (int stream_index : stream_indices) {
 646                                 servers->add_data(stream_index, inner_data, size, flags, next_block_pts);
 647                         }
 648                         next_block_pts = RationalPTS();
 649                 }
 650
 651                 // Consume the block. This isn't the most efficient way of dealing with things
 652                 // should we have many blocks, but these routines don't need to be too efficient
 653                 // anyway.
 654                 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube2_block_header) + size);
 655                 has_metacube_header = false;
 656         }
 657 }
 658
 659 void HTTPInput::drop_pending_data(size_t num_bytes)
 660 {
 661         if (num_bytes == 0) {
 662                 return;
 663         }
 664         log(WARNING, "[%s] Dropping %lld junk bytes; not a Metacube2 stream, or data was dropped from the middle of the stream.",
 665                 url.c_str(), (long long)num_bytes);
 666         assert(pending_data.size() >= num_bytes);
 667         pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);
 668 }
 669
 670 void HTTPInput::add_destination(int stream_index)
 671 {
 672         stream_indices.push_back(stream_index);
 673         servers->set_header(stream_index, http_header, stream_header);
 674 }
 675
 676 InputStats HTTPInput::get_stats() const
 677 {
 678         lock_guard<mutex> lock(stats_mutex);
 679         return stats;
 680 }
 681
 682 void HTTPInput::process_metacube_metadata_block(const metacube2_block_header &hdr, const char *payload, uint32_t payload_size)
 683 {
 684         if (payload_size < sizeof(uint64_t)) {
 685                 log(WARNING, "[%s] Undersized Metacube metadata block (%d bytes); corrupted header?",
 686                         url.c_str(), payload_size);
 687                 return;
 688         }
 689
 690         uint64_t type = be64toh(*(const uint64_t *)payload);
 691         if (type == METACUBE_METADATA_TYPE_ENCODER_TIMESTAMP) {
 692                 timespec now;
 693                 clock_gettime(CLOCK_REALTIME, &now);
 694
 695                 const metacube2_timestamp_packet *pkt = (const metacube2_timestamp_packet *)payload;
 696                 if (payload_size != sizeof(*pkt)) {
 697                         log(WARNING, "[%s] Metacube timestamp block of wrong size (%d bytes); ignoring.",
 698                                 url.c_str(), payload_size);
 699                         return;
 700                 }
 701
 702                 double elapsed = now.tv_sec - be64toh(pkt->tv_sec) +
 703                         1e-9 * (now.tv_nsec - long(be64toh(pkt->tv_nsec)));
 704                 {
 705                         lock_guard<mutex> lock(stats_mutex);
 706                         stats.latency_sec = elapsed;
 707                 }
 708         } else if (type == METACUBE_METADATA_TYPE_NEXT_BLOCK_PTS) {
 709                 const metacube2_pts_packet *pkt = (const metacube2_pts_packet *)payload;
 710                 if (payload_size != sizeof(*pkt)) {
 711                         log(WARNING, "[%s] Metacube pts block of wrong size (%d bytes); ignoring.",
 712                                 url.c_str(), payload_size);
 713                         return;
 714                 }
 715                 next_block_pts.pts = be64toh(pkt->pts);
 716                 next_block_pts.timebase_num = be64toh(pkt->timebase_num);
 717                 next_block_pts.timebase_den = be64toh(pkt->timebase_den);
 718         } else {
 719                 // Unknown metadata block, ignore
 720                 log(INFO, "[%s] Metadata block %llu\n", url.c_str(), type);
 721                 return;
 722         }
 723 }