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

   1 #include <assert.h>
   2 #include <errno.h>
   3 #include <fcntl.h>
   4 #include <math.h>
   5 #include <netdb.h>
   6 #include <netinet/in.h>
   7 #include <poll.h>
   8 #include <stdint.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <sys/ioctl.h>
  12 #include <sys/socket.h>
  13 #include <sys/time.h>
  14 #include <time.h>
  15 #include <unistd.h>
  16 #include <math.h>
  17 #include <map>
  18 #include <string>
  19 #include <utility>
  20 #include <vector>
  21
  22 #include "httpinput.h"
  23 #include "log.h"
  24 #include "metacube2.h"
  25 #include "parse.h"
  26 #include "serverpool.h"
  27 #include "state.pb.h"
  28 #include "stream.h"
  29 #include "timespec.h"
  30 #include "util.h"
  31 #include "version.h"
  32
  33 using namespace std;
  34
  35 namespace {
  36
  37 string host_header(const string &host, const string &port)
  38 {
  39         if (port == "http" || atoi(port.c_str()) == 80) {
  40                 return host;
  41         } else {
  42                 return host + ":" + port;
  43         }
  44 }
  45
  46 }  // namespace
  47
  48 extern ServerPool *servers;
  49
  50 HTTPInput::HTTPInput(const string &url, Input::Encoding encoding)
  51         : state(NOT_CONNECTED),
  52           url(url),
  53           encoding(encoding)
  54 {
  55         stats.url = url;
  56         stats.bytes_received = 0;
  57         stats.data_bytes_received = 0;
  58         stats.metadata_bytes_received = 0;
  59         stats.connect_time = -1;
  60         stats.latency_sec = HUGE_VAL;
  61 }
  62
  63 HTTPInput::HTTPInput(const InputProto &serialized)
  64         : state(State(serialized.state())),
  65           url(serialized.url()),
  66           encoding(serialized.is_metacube_encoded() ?
  67                    Input::INPUT_ENCODING_METACUBE :
  68                    Input::INPUT_ENCODING_RAW),
  69           request(serialized.request()),
  70           request_bytes_sent(serialized.request_bytes_sent()),
  71           response(serialized.response()),
  72           http_header(serialized.http_header()),
  73           stream_header(serialized.stream_header()),
  74           has_metacube_header(serialized.has_metacube_header()),
  75           sock(serialized.sock())
  76 {
  77         // Set back the close-on-exec flag for the socket.
  78         // (This can't leak into a child, since we haven't been started yet.)
  79         fcntl(sock, F_SETFD, 1);
  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         stats.url = url;
  88         stats.bytes_received = serialized.bytes_received();
  89         stats.data_bytes_received = serialized.data_bytes_received();
  90         stats.metadata_bytes_received = serialized.metadata_bytes_received();
  91         if (serialized.has_connect_time()) {
  92                 stats.connect_time = serialized.connect_time();
  93         } else {
  94                 stats.connect_time = time(nullptr);
  95         }
  96         if (serialized.has_latency_sec()) {
  97                 stats.latency_sec = serialized.latency_sec();
  98         } else {
  99                 stats.latency_sec = HUGE_VAL;
 100         }
 101
 102         last_verbose_connection.tv_sec = -3600;
 103         last_verbose_connection.tv_nsec = 0;
 104 }
 105
 106 void HTTPInput::close_socket()
 107 {
 108         if (sock != -1) {
 109                 safe_close(sock);
 110                 sock = -1;
 111         }
 112
 113         lock_guard<mutex> lock(stats_mutex);
 114         stats.connect_time = -1;
 115 }
 116
 117 InputProto HTTPInput::serialize() const
 118 {
 119         // Unset the close-on-exec flag for the socket.
 120         // (This can't leak into a child, since there's only one thread left.)
 121         fcntl(sock, F_SETFD, 0);
 122
 123         InputProto serialized;
 124         serialized.set_state(state);
 125         serialized.set_url(url);
 126         serialized.set_request(request);
 127         serialized.set_request_bytes_sent(request_bytes_sent);
 128         serialized.set_response(response);
 129         serialized.set_http_header(http_header);
 130         serialized.set_stream_header(stream_header);
 131         serialized.set_pending_data(string(pending_data.begin(), pending_data.end()));
 132         serialized.set_has_metacube_header(has_metacube_header);
 133         serialized.set_sock(sock);
 134         serialized.set_bytes_received(stats.bytes_received);
 135         serialized.set_data_bytes_received(stats.data_bytes_received);
 136         if (isfinite(stats.latency_sec)) {
 137                 serialized.set_latency_sec(stats.latency_sec);
 138         }
 139         serialized.set_connect_time(stats.connect_time);
 140         if (encoding == Input::INPUT_ENCODING_METACUBE) {
 141                 serialized.set_is_metacube_encoded(true);
 142         } else {
 143                 assert(encoding == Input::INPUT_ENCODING_RAW);
 144                 serialized.set_is_metacube_encoded(false);
 145         }
 146         return serialized;
 147 }
 148
 149 int HTTPInput::lookup_and_connect(const string &host, const string &port)
 150 {
 151         addrinfo *ai;
 152         int err = getaddrinfo(host.c_str(), port.c_str(), nullptr, &ai);
 153         if (err != 0) {
 154                 if (!suppress_logging) {
 155                         log(WARNING, "[%s] Lookup of '%s' failed (%s).",
 156                                 url.c_str(), host.c_str(), gai_strerror(err));
 157                 }
 158                 return -1;
 159         }
 160
 161         addrinfo *base_ai = ai;
 162
 163         // Connect to everything in turn until we have a socket.
 164         for ( ; ai && !should_stop(); ai = ai->ai_next) {
 165                 // Now do a non-blocking connect. This is important because we want to be able to be
 166                 // woken up, even though it's rather cumbersome.
 167                 int sock = socket(ai->ai_family, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, IPPROTO_TCP);
 168                 if (sock == -1) {
 169                         // Could be e.g. EPROTONOSUPPORT. The show must go on.
 170                         continue;
 171                 }
 172
 173                 // Do a non-blocking connect.
 174                 do {
 175                         err = connect(sock, ai->ai_addr, ai->ai_addrlen);
 176                 } while (err == -1 && errno == EINTR);
 177
 178                 if (err == -1 && errno != EINPROGRESS) {
 179                         log_perror("connect");
 180                         safe_close(sock);
 181                         continue;
 182                 }
 183
 184                 // Wait for the connect to complete, or an error to happen.
 185                 for ( ;; ) {
 186                         bool complete = wait_for_activity(sock, POLLIN | POLLOUT, nullptr);
 187                         if (should_stop()) {
 188                                 safe_close(sock);
 189                                 return -1;
 190                         }
 191                         if (complete) {
 192                                 break;
 193                         }
 194                 }
 195
 196                 // Check whether it ended in an error or not.
 197                 socklen_t err_size = sizeof(err);
 198                 if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &err_size) == -1) {
 199                         log_perror("getsockopt");
 200                         safe_close(sock);
 201                         continue;
 202                 }
 203
 204                 errno = err;
 205
 206                 if (err == 0) {
 207                         // Successful connect.
 208                         freeaddrinfo(base_ai);
 209                         return sock;
 210                 }
 211
 212                 safe_close(sock);
 213         }
 214
 215         // Give the last one as error.
 216         if (!suppress_logging) {
 217                 log(WARNING, "[%s] Connect to '%s' failed (%s)",
 218                         url.c_str(), host.c_str(), strerror(errno));
 219         }
 220         freeaddrinfo(base_ai);
 221         return -1;
 222 }
 223
 224 bool HTTPInput::parse_response(const string &request)
 225 {
 226         vector<string> lines = split_lines(response);
 227         if (lines.empty()) {
 228                 if (!suppress_logging) {
 229                         log(WARNING, "[%s] Empty HTTP response from input.", url.c_str());
 230                 }
 231                 return false;
 232         }
 233
 234         vector<string> first_line_tokens = split_tokens(lines[0]);
 235         if (first_line_tokens.size() < 2) {
 236                 if (!suppress_logging) {
 237                         log(WARNING, "[%s] Malformed response line '%s' from input.",
 238                                 url.c_str(), lines[0].c_str());
 239                 }
 240                 return false;
 241         }
 242
 243         int response = atoi(first_line_tokens[1].c_str());
 244         if (response != 200) {
 245                 if (!suppress_logging) {
 246                         log(WARNING, "[%s] Non-200 response '%s' from input.",
 247                                 url.c_str(), lines[0].c_str());
 248                 }
 249                 return false;
 250         }
 251
 252         HTTPHeaderMultimap parameters = extract_headers(lines, url);
 253
 254         // Remove “Content-encoding: metacube”.
 255         const auto encoding_it = parameters.find("Content-Encoding");
 256         if (encoding_it != parameters.end() && encoding_it->second == "metacube") {
 257                 parameters.erase(encoding_it);
 258         }
 259
 260         // Change “Server: foo” to “Server: metacube/0.1 (reflecting: foo)”
 261         // XXX: Use a Via: instead?
 262         if (parameters.count("Server") == 0) {
 263                 parameters.insert(make_pair("Server", SERVER_IDENTIFICATION));
 264         } else {
 265                 for (auto &key_and_value : parameters) {
 266                         if (key_and_value.first != "Server") {
 267                                 continue;
 268                         }
 269                         key_and_value.second = SERVER_IDENTIFICATION " (reflecting: " + key_and_value.second + ")";
 270                 }
 271         }
 272
 273         // Erase “Connection: close”; we'll set it on the sending side if needed.
 274         parameters.erase("Connection");
 275
 276         // Construct the new HTTP header.
 277         http_header = "HTTP/1.0 200 OK\r\n";
 278         for (const auto &key_and_value : parameters) {
 279                 http_header.append(key_and_value.first + ": " + key_and_value.second + "\r\n");
 280         }
 281
 282         for (int stream_index : stream_indices) {
 283                 servers->set_header(stream_index, http_header, stream_header);
 284         }
 285
 286         return true;
 287 }
 288
 289 void HTTPInput::do_work()
 290 {
 291         timespec last_activity;
 292
 293         // TODO: Make the timeout persist across restarts.
 294         if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
 295                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
 296                 assert(err != -1);
 297         }
 298
 299         while (!should_stop()) {
 300                 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
 301                         // Give the socket 30 seconds since last activity before we time out.
 302                         static const int timeout_secs = 30;
 303
 304                         timespec now;
 305                         int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &now);
 306                         assert(err != -1);
 307
 308                         timespec elapsed = clock_diff(last_activity, now);
 309                         if (elapsed.tv_sec >= timeout_secs) {
 310                                 // Timeout!
 311                                 if (!suppress_logging) {
 312                                         log(ERROR, "[%s] Timeout after %d seconds, closing.", url.c_str(), elapsed.tv_sec);
 313                                 }
 314                                 state = CLOSING_SOCKET;
 315                                 continue;
 316                         }
 317
 318                         // Basically calculate (30 - (now - last_activity)) = (30 + (last_activity - now)).
 319                         // Add a second of slack to account for differences between clocks.
 320                         timespec timeout = clock_diff(now, last_activity);
 321                         timeout.tv_sec += timeout_secs + 1;
 322                         assert(timeout.tv_sec > 0 || (timeout.tv_sec >= 0 && timeout.tv_nsec > 0));
 323
 324                         bool activity = wait_for_activity(sock, (state == SENDING_REQUEST) ? POLLOUT : POLLIN, &timeout);
 325                         if (activity) {
 326                                 err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
 327                                 assert(err != -1);
 328                         } else {
 329                                 // OK. Most likely, should_stop was set, or we have timed out.
 330                                 continue;
 331                         }
 332                 }
 333
 334                 switch (state) {
 335                 case NOT_CONNECTED:
 336                         request.clear();
 337                         request_bytes_sent = 0;
 338                         response.clear();
 339                         pending_data.clear();
 340                         has_metacube_header = false;
 341                         for (int stream_index : stream_indices) {
 342                                 // Don't zero out the header; it might still be of use to HLS clients.
 343                                 servers->set_unavailable(stream_index);
 344                         }
 345
 346                         {
 347                                 string protocol, user;  // Thrown away.
 348                                 if (!parse_url(url, &protocol, &user, &host, &port, &path)) {
 349                                         if (!suppress_logging) {
 350                                                 log(WARNING, "[%s] Failed to parse URL '%s'", url.c_str(), url.c_str());
 351                                         }
 352                                         break;
 353                                 }
 354
 355                                 // Remove the brackets around IPv6 address literals.
 356                                 // TODO: See if we can join this with the code in parse_ip_address(),
 357                                 // or maybe even more it into parse_url().
 358                                 if (!host.empty() && host[0] == '[' && host[host.size() - 1] == ']') {
 359                                         host = host.substr(1, host.size() - 2);
 360                                 }
 361                         }
 362
 363                         if (suppress_logging) {
 364                                 // See if there's more than one minute since last time we made a connection
 365                                 // with logging enabled. If so, turn it on again.
 366                                 timespec now;
 367                                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &now);
 368                                 assert(err != -1);
 369
 370                                 double elapsed = now.tv_sec - last_verbose_connection.tv_sec +
 371                                         1e-9 * (now.tv_nsec - last_verbose_connection.tv_nsec);
 372                                 if (elapsed > 60.0) {
 373                                         suppress_logging = false;
 374                                 }
 375                         }
 376                         if (!suppress_logging) {
 377                                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_verbose_connection);
 378                                 assert(err != -1);
 379                         }
 380                         ++num_connection_attempts;
 381                         sock = lookup_and_connect(host, port);
 382                         if (sock != -1) {
 383                                 // Yay, successful connect.
 384                                 state = SENDING_REQUEST;
 385                                 request = "GET " + path + " HTTP/1.0\r\nHost: " + host_header(host, port) + "\r\nUser-Agent: cubemap\r\n\r\n";
 386                                 request_bytes_sent = 0;
 387
 388                                 lock_guard<mutex> lock(stats_mutex);
 389                                 stats.connect_time = time(nullptr);
 390                                 clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
 391                         }
 392                         break;
 393                 case SENDING_REQUEST: {
 394                         size_t to_send = request.size() - request_bytes_sent;
 395                         int ret;
 396
 397                         do {
 398                                 ret = write(sock, request.data() + request_bytes_sent, to_send);
 399                         } while (ret == -1 && errno == EINTR);
 400
 401                         if (ret == -1) {
 402                                 log_perror("write");
 403                                 state = CLOSING_SOCKET;
 404                                 continue;
 405                         }
 406
 407                         assert(ret >= 0);
 408                         request_bytes_sent += ret;
 409
 410                         if (request_bytes_sent == request.size()) {
 411                                 state = RECEIVING_HEADER;
 412                         }
 413                         break;
 414                 }
 415                 case RECEIVING_HEADER: {
 416                         char buf[4096];
 417                         int ret;
 418
 419                         do {
 420                                 ret = read(sock, buf, sizeof(buf));
 421                         } while (ret == -1 && errno == EINTR);
 422
 423                         if (ret == -1) {
 424                                 log_perror("read");
 425                                 state = CLOSING_SOCKET;
 426                                 continue;
 427                         }
 428
 429                         if (ret == 0) {
 430                                 // This really shouldn't happen...
 431                                 if (!suppress_logging) {
 432                                         log(ERROR, "[%s] Socket unexpectedly closed while reading header",
 433                                                    url.c_str());
 434                                 }
 435                                 state = CLOSING_SOCKET;
 436                                 continue;
 437                         }
 438
 439                         RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
 440
 441                         if (status == RP_OUT_OF_SPACE) {
 442                                 if (!suppress_logging) {
 443                                         log(WARNING, "[%s] Server sent overlong HTTP response!", url.c_str());
 444                                 }
 445                                 state = CLOSING_SOCKET;
 446                                 continue;
 447                         } else if (status == RP_NOT_FINISHED_YET) {
 448                                 continue;
 449                         }
 450
 451                         // OK, so we're fine, but there might be some of the actual data after the response.
 452                         // We'll need to deal with that separately.
 453                         string extra_data;
 454                         if (status == RP_EXTRA_DATA) {
 455                                 char *ptr = static_cast<char *>(
 456                                         memmem(response.data(), response.size(), "\r\n\r\n", 4));
 457                                 assert(ptr != nullptr);
 458                                 extra_data = string(ptr + 4, &response[0] + response.size());
 459                                 response.resize(ptr - response.data());
 460                         }
 461
 462                         if (!parse_response(response)) {
 463                                 state = CLOSING_SOCKET;
 464                                 continue;
 465                         }
 466
 467                         if (!extra_data.empty()) {
 468                                 process_data(&extra_data[0], extra_data.size());
 469                         }
 470
 471                         if (!suppress_logging) {
 472                                 if (encoding == Input::INPUT_ENCODING_RAW) {
 473                                         log(INFO, "[%s] Connected to '%s', receiving raw data.",
 474                                                    url.c_str(), url.c_str());
 475                                 } else {
 476                                         assert(encoding == Input::INPUT_ENCODING_METACUBE);
 477                                         log(INFO, "[%s] Connected to '%s', receiving data.",
 478                                                    url.c_str(), url.c_str());
 479                                 }
 480                         }
 481                         state = RECEIVING_DATA;
 482                         break;
 483                 }
 484                 case RECEIVING_DATA: {
 485                         char buf[4096];
 486                         int ret;
 487
 488                         do {
 489                                 ret = read(sock, buf, sizeof(buf));
 490                         } while (ret == -1 && errno == EINTR);
 491
 492                         if (ret == -1) {
 493                                 log_perror("read");
 494                                 state = CLOSING_SOCKET;
 495                                 continue;
 496                         }
 497
 498                         if (ret == 0) {
 499                                 // This really shouldn't happen...
 500                                 if (!suppress_logging) {
 501                                         log(ERROR, "[%s] Socket unexpectedly closed while reading data",
 502                                                    url.c_str());
 503                                 }
 504                                 state = CLOSING_SOCKET;
 505                                 continue;
 506                         }
 507
 508                         num_connection_attempts = 0;  // Reset, since we have a successful read.
 509                         if (suppress_logging) {
 510                                 // This was suppressed earlier, so print it out now.
 511                                 if (encoding == Input::INPUT_ENCODING_RAW) {
 512                                         log(INFO, "[%s] Connected to '%s', receiving raw data.",
 513                                                    url.c_str(), url.c_str());
 514                                 } else {
 515                                         assert(encoding == Input::INPUT_ENCODING_METACUBE);
 516                                         log(INFO, "[%s] Connected to '%s', receiving data.",
 517                                                    url.c_str(), url.c_str());
 518                                 }
 519                                 suppress_logging = false;
 520                         }
 521
 522                         process_data(buf, ret);
 523                         break;
 524                 }
 525                 case CLOSING_SOCKET: {
 526                         close_socket();
 527                         state = NOT_CONNECTED;
 528                         break;
 529                 }
 530                 default:
 531                         assert(false);
 532                 }
 533
 534                 // If we are still in NOT_CONNECTED, either something went wrong,
 535                 // or the connection just got closed.
 536                 // The earlier steps have already given the error message, if any.
 537                 if (state == NOT_CONNECTED && !should_stop()) {
 538                         if (!suppress_logging) {
 539                                 log(INFO, "[%s] Waiting 0.2 seconds and restarting...", url.c_str());
 540                         }
 541
 542                         if (num_connection_attempts >= 3 && !suppress_logging) {
 543                                 log(INFO, "[%s] %d failed connection attempts, suppressing logging for one minute.",
 544                                         url.c_str(), num_connection_attempts);
 545                                 suppress_logging = true;
 546                         }
 547                         timespec timeout_ts;
 548                         timeout_ts.tv_sec = 0;
 549                         timeout_ts.tv_nsec = 200000000;
 550                         wait_for_wakeup(&timeout_ts);
 551                 }
 552         }
 553 }
 554
 555 void HTTPInput::process_data(char *ptr, size_t bytes)
 556 {
 557         {
 558                 lock_guard<mutex> lock(stats_mutex);
 559                 stats.bytes_received += bytes;
 560         }
 561
 562         if (encoding == Input::INPUT_ENCODING_RAW) {
 563                 for (int stream_index : stream_indices) {
 564                         servers->add_data(stream_index, ptr, bytes, /*metacube_flags=*/0, /*pts=*/RationalPTS());
 565                 }
 566                 return;
 567         }
 568
 569         assert(encoding == Input::INPUT_ENCODING_METACUBE);
 570         pending_data.insert(pending_data.end(), ptr, ptr + bytes);
 571
 572         for ( ;; ) {
 573                 // If we don't have enough data (yet) for even the Metacube header, just return.
 574                 if (pending_data.size() < sizeof(metacube2_block_header)) {
 575                         return;
 576                 }
 577
 578                 // Make sure we have the Metacube sync header at the start.
 579                 // We may need to skip over junk data (it _should_ not happen, though).
 580                 if (!has_metacube_header) {
 581                         char *ptr = static_cast<char *>(
 582                                 memmem(pending_data.data(), pending_data.size(),
 583                                        METACUBE2_SYNC, strlen(METACUBE2_SYNC)));
 584                         if (ptr == nullptr) {
 585                                 // OK, so we didn't find the sync marker. We know then that
 586                                 // we do not have the _full_ marker in the buffer, but we
 587                                 // could have N-1 bytes. Drop everything before that,
 588                                 // and then give up.
 589                                 drop_pending_data(pending_data.size() - (strlen(METACUBE2_SYNC) - 1));
 590                                 return;
 591                         } else {
 592                                 // Yay, we found the header. Drop everything (if anything) before it.
 593                                 drop_pending_data(ptr - pending_data.data());
 594                                 has_metacube_header = true;
 595
 596                                 // Re-check that we have the entire header; we could have dropped data.
 597                                 if (pending_data.size() < sizeof(metacube2_block_header)) {
 598                                         return;
 599                                 }
 600                         }
 601                 }
 602
 603                 // Now it's safe to read the header.
 604                 metacube2_block_header hdr;
 605                 memcpy(&hdr, pending_data.data(), sizeof(hdr));
 606                 assert(memcmp(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync)) == 0);
 607                 uint32_t size = ntohl(hdr.size);
 608                 uint16_t flags = ntohs(hdr.flags);
 609                 uint16_t expected_csum = metacube2_compute_crc(&hdr);
 610
 611                 if (expected_csum != ntohs(hdr.csum)) {
 612                         log(WARNING, "[%s] Metacube checksum failed (expected 0x%x, got 0x%x), "
 613                                 "not reading block claiming to be %d bytes (flags=%x).",
 614                                 url.c_str(), expected_csum, ntohs(hdr.csum),
 615                                 size, flags);
 616
 617                         // Drop only the first byte, and let the rest of the code handle resync.
 618                         pending_data.erase(pending_data.begin(), pending_data.begin() + 1);
 619                         has_metacube_header = false;
 620                         continue;
 621                 }
 622                 if (size > 10485760) {
 623                         log(WARNING, "[%s] Metacube block of %d bytes (flags=%x); corrupted header??",
 624                                 url.c_str(), size, flags);
 625                 }
 626
 627                 // See if we have the entire block. If not, wait for more data.
 628                 if (pending_data.size() < sizeof(metacube2_block_header) + size) {
 629                         return;
 630                 }
 631
 632                 // See if this is a metadata block. If so, we don't want to send it on,
 633                 // but rather process it ourselves.
 634                 // TODO: Keep metadata when sending on to other Metacube users.
 635                 if (flags & METACUBE_FLAGS_METADATA) {
 636                         {
 637                                 lock_guard<mutex> lock(stats_mutex);
 638                                 stats.metadata_bytes_received += size;
 639                         }
 640                         process_metacube_metadata_block(hdr, pending_data.data() + sizeof(hdr), size);
 641                 } else {
 642                         // Send this block on to the servers.
 643                         {
 644                                 lock_guard<mutex> lock(stats_mutex);
 645                                 stats.data_bytes_received += size;
 646                         }
 647                         char *inner_data = pending_data.data() + sizeof(metacube2_block_header);
 648                         if (flags & METACUBE_FLAGS_HEADER) {
 649                                 stream_header = string(inner_data, inner_data + size);
 650                                 for (int stream_index : stream_indices) {
 651                                         servers->set_header(stream_index, http_header, stream_header);
 652                                 }
 653                         }
 654                         for (int stream_index : stream_indices) {
 655                                 servers->add_data(stream_index, inner_data, size, flags, next_block_pts);
 656                         }
 657                         next_block_pts = RationalPTS();
 658                 }
 659
 660                 // Consume the block. This isn't the most efficient way of dealing with things
 661                 // should we have many blocks, but these routines don't need to be too efficient
 662                 // anyway.
 663                 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube2_block_header) + size);
 664                 has_metacube_header = false;
 665         }
 666 }
 667
 668 void HTTPInput::drop_pending_data(size_t num_bytes)
 669 {
 670         if (num_bytes == 0) {
 671                 return;
 672         }
 673         log(WARNING, "[%s] Dropping %lld junk bytes; not a Metacube2 stream, or data was dropped from the middle of the stream.",
 674                 url.c_str(), (long long)num_bytes);
 675         assert(pending_data.size() >= num_bytes);
 676         pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);
 677 }
 678
 679 void HTTPInput::add_destination(int stream_index)
 680 {
 681         stream_indices.push_back(stream_index);
 682         servers->set_header(stream_index, http_header, stream_header);
 683 }
 684
 685 InputStats HTTPInput::get_stats() const
 686 {
 687         lock_guard<mutex> lock(stats_mutex);
 688         return stats;
 689 }
 690
 691 void HTTPInput::process_metacube_metadata_block(const metacube2_block_header &hdr, const char *payload, uint32_t payload_size)
 692 {
 693         if (payload_size < sizeof(uint64_t)) {
 694                 log(WARNING, "[%s] Undersized Metacube metadata block (%d bytes); corrupted header?",
 695                         url.c_str(), payload_size);
 696                 return;
 697         }
 698
 699         uint64_t type = be64toh(*(const uint64_t *)payload);
 700         if (type == METACUBE_METADATA_TYPE_ENCODER_TIMESTAMP) {
 701                 timespec now;
 702                 clock_gettime(CLOCK_REALTIME, &now);
 703
 704                 const metacube2_timestamp_packet *pkt = (const metacube2_timestamp_packet *)payload;
 705                 if (payload_size != sizeof(*pkt)) {
 706                         log(WARNING, "[%s] Metacube timestamp block of wrong size (%d bytes); ignoring.",
 707                                 url.c_str(), payload_size);
 708                         return;
 709                 }
 710
 711                 double elapsed = now.tv_sec - be64toh(pkt->tv_sec) +
 712                         1e-9 * (now.tv_nsec - long(be64toh(pkt->tv_nsec)));
 713                 {
 714                         lock_guard<mutex> lock(stats_mutex);
 715                         stats.latency_sec = elapsed;
 716                 }
 717         } else if (type == METACUBE_METADATA_TYPE_NEXT_BLOCK_PTS) {
 718                 const metacube2_pts_packet *pkt = (const metacube2_pts_packet *)payload;
 719                 if (payload_size != sizeof(*pkt)) {
 720                         log(WARNING, "[%s] Metacube pts block of wrong size (%d bytes); ignoring.",
 721                                 url.c_str(), payload_size);
 722                         return;
 723                 }
 724                 next_block_pts.pts = be64toh(pkt->pts);
 725                 next_block_pts.timebase_num = be64toh(pkt->timebase_num);
 726                 next_block_pts.timebase_den = be64toh(pkt->timebase_den);
 727         } else {
 728                 // Unknown metadata block, ignore
 729                 log(INFO, "[%s] Metadata block %llu\n", url.c_str(), type);
 730                 return;
 731         }
 732 }