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 <sys/types.h>
  15 #include <sys/wait.h>
  16 #include <time.h>
  17 #include <unistd.h>
  18 #include <math.h>
  19 #include <spawn.h>
  20 #include <map>
  21 #include <string>
  22 #include <utility>
  23 #include <vector>
  24
  25 #include "httpinput.h"
  26 #include "log.h"
  27 #include "metacube2.h"
  28 #include "parse.h"
  29 #include "serverpool.h"
  30 #include "state.pb.h"
  31 #include "stream.h"
  32 #include "timespec.h"
  33 #include "util.h"
  34 #include "version.h"
  35
  36 using namespace std;
  37
  38 namespace {
  39
  40 string host_header(const string &host, const string &port)
  41 {
  42         if (port == "http" || atoi(port.c_str()) == 80) {
  43                 return host;
  44         } else {
  45                 return host + ":" + port;
  46         }
  47 }
  48
  49 }  // namespace
  50
  51 extern ServerPool *servers;
  52
  53 HTTPInput::HTTPInput(const string &url, Input::Encoding encoding)
  54         : state(NOT_CONNECTED),
  55           url(url),
  56           encoding(encoding)
  57 {
  58         stats.url = url;
  59         stats.bytes_received = 0;
  60         stats.data_bytes_received = 0;
  61         stats.metadata_bytes_received = 0;
  62         stats.connect_time = -1;
  63         stats.latency_sec = HUGE_VAL;
  64 }
  65
  66 HTTPInput::HTTPInput(const InputProto &serialized)
  67         : state(State(serialized.state())),
  68           url(serialized.url()),
  69           encoding(serialized.is_metacube_encoded() ?
  70                    Input::INPUT_ENCODING_METACUBE :
  71                    Input::INPUT_ENCODING_RAW),
  72           request(serialized.request()),
  73           request_bytes_sent(serialized.request_bytes_sent()),
  74           response(serialized.response()),
  75           http_header(serialized.http_header()),
  76           stream_header(serialized.stream_header()),
  77           has_metacube_header(serialized.has_metacube_header()),
  78           sock(serialized.sock()),
  79           child_pid(serialized.child_pid())
  80 {
  81         // Set back the close-on-exec flag for the socket.
  82         // (This can't leak into a child, since we haven't been started yet.)
  83         if (sock != -1) {
  84                 fcntl(sock, F_SETFD, FD_CLOEXEC);
  85         }
  86
  87         pending_data.resize(serialized.pending_data().size());
  88         memcpy(&pending_data[0], serialized.pending_data().data(), serialized.pending_data().size());
  89
  90         string protocol, user;
  91         parse_url(url, &protocol, &user, &host, &port, &path);  // Don't care if it fails.
  92
  93         stats.url = url;
  94         stats.bytes_received = serialized.bytes_received();
  95         stats.data_bytes_received = serialized.data_bytes_received();
  96         stats.metadata_bytes_received = serialized.metadata_bytes_received();
  97         if (serialized.has_connect_time()) {
  98                 stats.connect_time = serialized.connect_time();
  99         } else {
 100                 stats.connect_time = time(nullptr);
 101         }
 102         if (serialized.has_latency_sec()) {
 103                 stats.latency_sec = serialized.latency_sec();
 104         } else {
 105                 stats.latency_sec = HUGE_VAL;
 106         }
 107
 108         last_verbose_connection.tv_sec = -3600;
 109         last_verbose_connection.tv_nsec = 0;
 110 }
 111
 112 void HTTPInput::close_socket()
 113 {
 114         if (sock != -1) {
 115                 safe_close(sock);
 116                 sock = -1;
 117         }
 118         if (child_pid != -1) {
 119                 // Kill the child process group, forcibly.
 120                 // TODO: Consider using a pidfd on newer kernels, so that we're guaranteed
 121                 // never to kill the wrong process.
 122                 kill(-child_pid, SIGKILL);
 123         }
 124         child_pid = -1;
 125
 126         lock_guard<mutex> lock(stats_mutex);
 127         stats.connect_time = -1;
 128 }
 129
 130 InputProto HTTPInput::serialize() const
 131 {
 132         // Unset the close-on-exec flag for the socket.
 133         // (This can't leak into a child, since there's only one thread left.)
 134         fcntl(sock, F_SETFD, 0);
 135
 136         InputProto serialized;
 137         serialized.set_state(state);
 138         serialized.set_url(url);
 139         serialized.set_request(request);
 140         serialized.set_request_bytes_sent(request_bytes_sent);
 141         serialized.set_response(response);
 142         serialized.set_http_header(http_header);
 143         serialized.set_stream_header(stream_header);
 144         serialized.set_pending_data(string(pending_data.begin(), pending_data.end()));
 145         serialized.set_has_metacube_header(has_metacube_header);
 146         serialized.set_sock(sock);
 147         serialized.set_child_pid(child_pid);
 148         serialized.set_bytes_received(stats.bytes_received);
 149         serialized.set_data_bytes_received(stats.data_bytes_received);
 150         if (isfinite(stats.latency_sec)) {
 151                 serialized.set_latency_sec(stats.latency_sec);
 152         }
 153         serialized.set_connect_time(stats.connect_time);
 154         if (encoding == Input::INPUT_ENCODING_METACUBE) {
 155                 serialized.set_is_metacube_encoded(true);
 156         } else {
 157                 assert(encoding == Input::INPUT_ENCODING_RAW);
 158                 serialized.set_is_metacube_encoded(false);
 159         }
 160         return serialized;
 161 }
 162
 163 int HTTPInput::lookup_and_connect(const string &host, const string &port)
 164 {
 165         addrinfo *ai;
 166         int err = getaddrinfo(host.c_str(), port.c_str(), nullptr, &ai);
 167         if (err != 0) {
 168                 if (!suppress_logging) {
 169                         log(WARNING, "[%s] Lookup of '%s' failed (%s).",
 170                                 url.c_str(), host.c_str(), gai_strerror(err));
 171                 }
 172                 freeaddrinfo(ai);
 173                 return -1;
 174         }
 175
 176         addrinfo *base_ai = ai;
 177
 178         // Connect to everything in turn until we have a socket.
 179         for ( ; ai && !should_stop(); ai = ai->ai_next) {
 180                 // Now do a non-blocking connect. This is important because we want to be able to be
 181                 // woken up, even though it's rather cumbersome.
 182                 int sock = socket(ai->ai_family, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, IPPROTO_TCP);
 183                 if (sock == -1) {
 184                         // Could be e.g. EPROTONOSUPPORT. The show must go on.
 185                         continue;
 186                 }
 187
 188                 // Do a non-blocking connect.
 189                 do {
 190                         err = connect(sock, ai->ai_addr, ai->ai_addrlen);
 191                 } while (err == -1 && errno == EINTR);
 192
 193                 if (err == -1 && errno != EINPROGRESS) {
 194                         log_perror("connect");
 195                         safe_close(sock);
 196                         continue;
 197                 }
 198
 199                 // Wait for the connect to complete, or an error to happen.
 200                 for ( ;; ) {
 201                         bool complete = wait_for_activity(sock, POLLIN | POLLOUT, nullptr);
 202                         if (should_stop()) {
 203                                 safe_close(sock);
 204                                 freeaddrinfo(base_ai);
 205                                 return -1;
 206                         }
 207                         if (complete) {
 208                                 break;
 209                         }
 210                 }
 211
 212                 // Check whether it ended in an error or not.
 213                 socklen_t err_size = sizeof(err);
 214                 if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &err_size) == -1) {
 215                         log_perror("getsockopt");
 216                         safe_close(sock);
 217                         continue;
 218                 }
 219
 220                 errno = err;
 221
 222                 if (err == 0) {
 223                         // Successful connect.
 224                         freeaddrinfo(base_ai);
 225                         return sock;
 226                 }
 227
 228                 safe_close(sock);
 229         }
 230
 231         // Give the last one as error.
 232         if (!suppress_logging) {
 233                 log(WARNING, "[%s] Connect to '%s' failed (%s)",
 234                         url.c_str(), host.c_str(), strerror(errno));
 235         }
 236         freeaddrinfo(base_ai);
 237         return -1;
 238 }
 239
 240 int HTTPInput::open_child_process(const string &cmdline)
 241 {
 242         int devnullfd = open("/dev/null", O_RDONLY | O_CLOEXEC);
 243         if (devnullfd == -1) {
 244                 log_perror("/dev/null");
 245                 return -1;
 246         }
 247
 248         int pipefd[2];
 249         if (pipe2(pipefd, O_CLOEXEC) == -1) {
 250                 log_perror("pipe2()");
 251                 close(devnullfd);
 252                 return -1;
 253         }
 254
 255         // Point stdout to us, stdin to /dev/null, and stderr remains where it is
 256         // (probably the systemd log). All other file descriptors should be marked
 257         // as close-on-exec, and should thus not leak into the child.
 258         posix_spawn_file_actions_t actions;
 259         posix_spawn_file_actions_init(&actions);
 260         posix_spawn_file_actions_adddup2(&actions, devnullfd, 0);
 261         posix_spawn_file_actions_adddup2(&actions, pipefd[1], 1);
 262
 263         // Make the process a leader of its own process group, so that we can easily
 264         // kill it and any of its child processes (unless it's started new process
 265         // groups itself, of course).
 266         posix_spawnattr_t attr;
 267         posix_spawnattr_init(&attr);
 268         posix_spawnattr_setflags(&attr, POSIX_SPAWN_SETPGROUP);
 269         posix_spawnattr_setpgroup(&attr, 0);
 270
 271         char * const argv[] = {
 272                 strdup("/bin/sh"),
 273                 strdup("-c"),
 274                 strdup(path.c_str()),
 275                 nullptr
 276         };
 277         int err = posix_spawn(&child_pid, "/bin/sh", &actions, &attr, argv, /*envp=*/nullptr);
 278         posix_spawn_file_actions_destroy(&actions);
 279         posix_spawnattr_destroy(&attr);
 280         free(argv[0]);
 281         free(argv[1]);
 282         free(argv[2]);
 283         close(devnullfd);
 284         close(pipefd[1]);
 285
 286         if (err == 0) {
 287                 return pipefd[0];
 288         } else {
 289                 child_pid = -1;
 290                 log_perror(cmdline.c_str());
 291                 close(pipefd[0]);
 292                 return -1;
 293         }
 294 }
 295
 296 bool HTTPInput::parse_response(const string &request)
 297 {
 298         vector<string> lines = split_lines(response);
 299         if (lines.empty()) {
 300                 if (!suppress_logging) {
 301                         log(WARNING, "[%s] Empty HTTP response from input.", url.c_str());
 302                 }
 303                 return false;
 304         }
 305
 306         vector<string> first_line_tokens = split_tokens(lines[0]);
 307         if (first_line_tokens.size() < 2) {
 308                 if (!suppress_logging) {
 309                         log(WARNING, "[%s] Malformed response line '%s' from input.",
 310                                 url.c_str(), lines[0].c_str());
 311                 }
 312                 return false;
 313         }
 314
 315         int response = atoi(first_line_tokens[1].c_str());
 316         if (response != 200) {
 317                 if (!suppress_logging) {
 318                         log(WARNING, "[%s] Non-200 response '%s' from input.",
 319                                 url.c_str(), lines[0].c_str());
 320                 }
 321                 return false;
 322         }
 323
 324         HTTPHeaderMultimap parameters = extract_headers(lines, url);
 325
 326         // Remove “Content-encoding: metacube”.
 327         const auto encoding_it = parameters.find("Content-Encoding");
 328         if (encoding_it != parameters.end() && encoding_it->second == "metacube") {
 329                 parameters.erase(encoding_it);
 330         }
 331
 332         // Change “Server: foo” to “Server: metacube/0.1 (reflecting: foo)”
 333         // XXX: Use a Via: instead?
 334         if (parameters.count("Server") == 0) {
 335                 parameters.insert(make_pair("Server", SERVER_IDENTIFICATION));
 336         } else {
 337                 for (auto &key_and_value : parameters) {
 338                         if (key_and_value.first != "Server") {
 339                                 continue;
 340                         }
 341                         key_and_value.second = SERVER_IDENTIFICATION " (reflecting: " + key_and_value.second + ")";
 342                 }
 343         }
 344
 345         // Erase “Connection: close”; we'll set it on the sending side if needed.
 346         parameters.erase("Connection");
 347
 348         // Construct the new HTTP header.
 349         http_header = "HTTP/1.0 200 OK\r\n";
 350         for (const auto &key_and_value : parameters) {
 351                 http_header.append(key_and_value.first + ": " + key_and_value.second + "\r\n");
 352         }
 353
 354         for (int stream_index : stream_indices) {
 355                 servers->set_header(stream_index, http_header, stream_header);
 356         }
 357
 358         return true;
 359 }
 360
 361 void HTTPInput::do_work()
 362 {
 363         timespec last_activity;
 364
 365         // TODO: Make the timeout persist across restarts.
 366         if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
 367                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
 368                 assert(err != -1);
 369         }
 370
 371         while (!should_stop()) {
 372                 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
 373                         // Give the socket 30 seconds since last activity before we time out.
 374                         static const int timeout_secs = 30;
 375
 376                         timespec now;
 377                         int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &now);
 378                         assert(err != -1);
 379
 380                         timespec elapsed = clock_diff(last_activity, now);
 381                         if (elapsed.tv_sec >= timeout_secs) {
 382                                 // Timeout!
 383                                 if (!suppress_logging) {
 384                                         log(ERROR, "[%s] Timeout after %d seconds, closing.", url.c_str(), elapsed.tv_sec);
 385                                 }
 386                                 state = CLOSING_SOCKET;
 387                                 continue;
 388                         }
 389
 390                         // Basically calculate (30 - (now - last_activity)) = (30 + (last_activity - now)).
 391                         // Add a second of slack to account for differences between clocks.
 392                         timespec timeout = clock_diff(now, last_activity);
 393                         timeout.tv_sec += timeout_secs + 1;
 394                         assert(timeout.tv_sec > 0 || (timeout.tv_sec >= 0 && timeout.tv_nsec > 0));
 395
 396                         bool activity = wait_for_activity(sock, (state == SENDING_REQUEST) ? POLLOUT : POLLIN, &timeout);
 397                         if (activity) {
 398                                 err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
 399                                 assert(err != -1);
 400                         } else {
 401                                 // OK. Most likely, should_stop was set, or we have timed out.
 402                                 continue;
 403                         }
 404                 }
 405
 406                 switch (state) {
 407                 case NOT_CONNECTED: {
 408                         // Reap any exited children.
 409                         int wstatus, err;
 410                         do {
 411                                 err = waitpid(-1, &wstatus, WNOHANG);
 412                                 if (err == -1) {
 413                                         if (errno == EINTR) {
 414                                                 continue;
 415                                         }
 416                                         if (errno == ECHILD) {
 417                                                 break;
 418                                         }
 419                                         log_perror("waitpid");
 420                                         break;
 421                                 }
 422                         } while (err != 0);
 423                         child_pid = -1;
 424
 425                         request.clear();
 426                         request_bytes_sent = 0;
 427                         response.clear();
 428                         pending_data.clear();
 429                         has_metacube_header = false;
 430                         for (int stream_index : stream_indices) {
 431                                 // Don't zero out the header; it might still be of use to HLS clients.
 432                                 servers->set_unavailable(stream_index);
 433                         }
 434
 435                         string protocol;
 436                         {
 437                                 string user;  // Thrown away.
 438                                 if (!parse_url(url, &protocol, &user, &host, &port, &path)) {
 439                                         if (!suppress_logging) {
 440                                                 log(WARNING, "[%s] Failed to parse URL '%s'", url.c_str(), url.c_str());
 441                                         }
 442                                         break;
 443                                 }
 444
 445                                 // Remove the brackets around IPv6 address literals.
 446                                 // TODO: See if we can join this with the code in parse_ip_address(),
 447                                 // or maybe even more it into parse_url().
 448                                 if (!host.empty() && host[0] == '[' && host[host.size() - 1] == ']') {
 449                                         host = host.substr(1, host.size() - 2);
 450                                 }
 451                         }
 452
 453                         if (suppress_logging) {
 454                                 // See if there's more than one minute since last time we made a connection
 455                                 // with logging enabled. If so, turn it on again.
 456                                 timespec now;
 457                                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &now);
 458                                 assert(err != -1);
 459
 460                                 double elapsed = now.tv_sec - last_verbose_connection.tv_sec +
 461                                         1e-9 * (now.tv_nsec - last_verbose_connection.tv_nsec);
 462                                 if (elapsed > 60.0) {
 463                                         suppress_logging = false;
 464                                 }
 465                         }
 466                         if (!suppress_logging) {
 467                                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_verbose_connection);
 468                                 assert(err != -1);
 469                         }
 470                         ++num_connection_attempts;
 471                         if (protocol == "pipe") {
 472                                 sock = open_child_process(path.c_str());
 473
 474                                 if (sock != -1) {
 475                                         // Construct a minimal HTTP header.
 476                                         http_header = "HTTP/1.0 200 OK\r\n";
 477                                         for (int stream_index : stream_indices) {
 478                                                 servers->set_header(stream_index, http_header, stream_header);
 479                                         }
 480                                         state = RECEIVING_DATA;
 481                                 }
 482                         } else {
 483                                 sock = lookup_and_connect(host, port);
 484                                 if (sock != -1) {
 485                                         // Yay, successful connect.
 486                                         state = SENDING_REQUEST;
 487                                         request = "GET " + path + " HTTP/1.0\r\nHost: " + host_header(host, port) + "\r\nUser-Agent: cubemap\r\n\r\n";
 488                                         request_bytes_sent = 0;
 489                                 }
 490                         }
 491                         if (sock != -1) {
 492                                 lock_guard<mutex> lock(stats_mutex);
 493                                 stats.connect_time = time(nullptr);
 494                                 clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
 495                         }
 496                         break;
 497                 }
 498                 case SENDING_REQUEST: {
 499                         size_t to_send = request.size() - request_bytes_sent;
 500                         int ret;
 501
 502                         do {
 503                                 ret = write(sock, request.data() + request_bytes_sent, to_send);
 504                         } while (ret == -1 && errno == EINTR);
 505
 506                         if (ret == -1) {
 507                                 log_perror("write");
 508                                 state = CLOSING_SOCKET;
 509                                 continue;
 510                         }
 511
 512                         assert(ret >= 0);
 513                         request_bytes_sent += ret;
 514
 515                         if (request_bytes_sent == request.size()) {
 516                                 state = RECEIVING_HEADER;
 517                         }
 518                         break;
 519                 }
 520                 case RECEIVING_HEADER: {
 521                         char buf[4096];
 522                         int ret;
 523
 524                         do {
 525                                 ret = read(sock, buf, sizeof(buf));
 526                         } while (ret == -1 && errno == EINTR);
 527
 528                         if (ret == -1) {
 529                                 log_perror("read");
 530                                 state = CLOSING_SOCKET;
 531                                 continue;
 532                         }
 533
 534                         if (ret == 0) {
 535                                 // This really shouldn't happen...
 536                                 if (!suppress_logging) {
 537                                         log(ERROR, "[%s] Socket unexpectedly closed while reading header",
 538                                                    url.c_str());
 539                                 }
 540                                 state = CLOSING_SOCKET;
 541                                 continue;
 542                         }
 543
 544                         RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
 545
 546                         if (status == RP_OUT_OF_SPACE) {
 547                                 if (!suppress_logging) {
 548                                         log(WARNING, "[%s] Server sent overlong HTTP response!", url.c_str());
 549                                 }
 550                                 state = CLOSING_SOCKET;
 551                                 continue;
 552                         } else if (status == RP_NOT_FINISHED_YET) {
 553                                 continue;
 554                         }
 555
 556                         // OK, so we're fine, but there might be some of the actual data after the response.
 557                         // We'll need to deal with that separately.
 558                         string extra_data;
 559                         if (status == RP_EXTRA_DATA) {
 560                                 char *ptr = static_cast<char *>(
 561                                         memmem(response.data(), response.size(), "\r\n\r\n", 4));
 562                                 assert(ptr != nullptr);
 563                                 extra_data = string(ptr + 4, &response[0] + response.size());
 564                                 response.resize(ptr - response.data());
 565                         }
 566
 567                         if (!parse_response(response)) {
 568                                 state = CLOSING_SOCKET;
 569                                 continue;
 570                         }
 571
 572                         if (!extra_data.empty()) {
 573                                 process_data(&extra_data[0], extra_data.size());
 574                         }
 575
 576                         if (!suppress_logging) {
 577                                 if (encoding == Input::INPUT_ENCODING_RAW) {
 578                                         log(INFO, "[%s] Connected to '%s', receiving raw data.",
 579                                                    url.c_str(), url.c_str());
 580                                 } else {
 581                                         assert(encoding == Input::INPUT_ENCODING_METACUBE);
 582                                         log(INFO, "[%s] Connected to '%s', receiving data.",
 583                                                    url.c_str(), url.c_str());
 584                                 }
 585                         }
 586                         state = RECEIVING_DATA;
 587                         break;
 588                 }
 589                 case RECEIVING_DATA: {
 590                         char buf[4096];
 591                         int ret;
 592
 593                         do {
 594                                 ret = read(sock, buf, sizeof(buf));
 595                         } while (ret == -1 && errno == EINTR);
 596
 597                         if (ret == -1) {
 598                                 log_perror("read");
 599                                 state = CLOSING_SOCKET;
 600                                 continue;
 601                         }
 602
 603                         if (ret == 0) {
 604                                 // This really shouldn't happen...
 605                                 if (!suppress_logging) {
 606                                         log(ERROR, "[%s] Socket unexpectedly closed while reading data",
 607                                                    url.c_str());
 608                                 }
 609                                 state = CLOSING_SOCKET;
 610                                 continue;
 611                         }
 612
 613                         num_connection_attempts = 0;  // Reset, since we have a successful read.
 614                         if (suppress_logging) {
 615                                 // This was suppressed earlier, so print it out now.
 616                                 if (encoding == Input::INPUT_ENCODING_RAW) {
 617                                         log(INFO, "[%s] Connected to '%s', receiving raw data.",
 618                                                    url.c_str(), url.c_str());
 619                                 } else {
 620                                         assert(encoding == Input::INPUT_ENCODING_METACUBE);
 621                                         log(INFO, "[%s] Connected to '%s', receiving data.",
 622                                                    url.c_str(), url.c_str());
 623                                 }
 624                                 suppress_logging = false;
 625                         }
 626
 627                         process_data(buf, ret);
 628                         break;
 629                 }
 630                 case CLOSING_SOCKET: {
 631                         close_socket();
 632                         state = NOT_CONNECTED;
 633                         break;
 634                 }
 635                 default:
 636                         assert(false);
 637                 }
 638
 639                 // If we are still in NOT_CONNECTED, either something went wrong,
 640                 // or the connection just got closed.
 641                 // The earlier steps have already given the error message, if any.
 642                 if (state == NOT_CONNECTED && !should_stop()) {
 643                         if (!suppress_logging) {
 644                                 log(INFO, "[%s] Waiting 0.2 seconds and restarting...", url.c_str());
 645                         }
 646
 647                         if (num_connection_attempts >= 3 && !suppress_logging) {
 648                                 log(INFO, "[%s] %d failed connection attempts, suppressing logging for one minute.",
 649                                         url.c_str(), num_connection_attempts);
 650                                 suppress_logging = true;
 651                         }
 652                         timespec timeout_ts;
 653                         timeout_ts.tv_sec = 0;
 654                         timeout_ts.tv_nsec = 200000000;
 655                         wait_for_wakeup(&timeout_ts);
 656                 }
 657         }
 658 }
 659
 660 void HTTPInput::process_data(char *ptr, size_t bytes)
 661 {
 662         {
 663                 lock_guard<mutex> lock(stats_mutex);
 664                 stats.bytes_received += bytes;
 665         }
 666
 667         if (encoding == Input::INPUT_ENCODING_RAW) {
 668                 for (int stream_index : stream_indices) {
 669                         servers->add_data(stream_index, ptr, bytes, /*metacube_flags=*/0, /*pts=*/RationalPTS());
 670                 }
 671                 return;
 672         }
 673
 674         assert(encoding == Input::INPUT_ENCODING_METACUBE);
 675         pending_data.insert(pending_data.end(), ptr, ptr + bytes);
 676
 677         for ( ;; ) {
 678                 // If we don't have enough data (yet) for even the Metacube header, just return.
 679                 if (pending_data.size() < sizeof(metacube2_block_header)) {
 680                         return;
 681                 }
 682
 683                 // Make sure we have the Metacube sync header at the start.
 684                 // We may need to skip over junk data (it _should_ not happen, though).
 685                 if (!has_metacube_header) {
 686                         char *ptr = static_cast<char *>(
 687                                 memmem(pending_data.data(), pending_data.size(),
 688                                        METACUBE2_SYNC, strlen(METACUBE2_SYNC)));
 689                         if (ptr == nullptr) {
 690                                 // OK, so we didn't find the sync marker. We know then that
 691                                 // we do not have the _full_ marker in the buffer, but we
 692                                 // could have N-1 bytes. Drop everything before that,
 693                                 // and then give up.
 694                                 drop_pending_data(pending_data.size() - (strlen(METACUBE2_SYNC) - 1));
 695                                 return;
 696                         } else {
 697                                 // Yay, we found the header. Drop everything (if anything) before it.
 698                                 drop_pending_data(ptr - pending_data.data());
 699                                 has_metacube_header = true;
 700
 701                                 // Re-check that we have the entire header; we could have dropped data.
 702                                 if (pending_data.size() < sizeof(metacube2_block_header)) {
 703                                         return;
 704                                 }
 705                         }
 706                 }
 707
 708                 // Now it's safe to read the header.
 709                 metacube2_block_header hdr;
 710                 memcpy(&hdr, pending_data.data(), sizeof(hdr));
 711                 assert(memcmp(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync)) == 0);
 712                 uint32_t size = ntohl(hdr.size);
 713                 uint16_t flags = ntohs(hdr.flags);
 714                 uint16_t expected_csum = metacube2_compute_crc(&hdr);
 715
 716                 if (expected_csum != ntohs(hdr.csum)) {
 717                         log(WARNING, "[%s] Metacube checksum failed (expected 0x%x, got 0x%x), "
 718                                 "not reading block claiming to be %d bytes (flags=%x).",
 719                                 url.c_str(), expected_csum, ntohs(hdr.csum),
 720                                 size, flags);
 721
 722                         // Drop only the first byte, and let the rest of the code handle resync.
 723                         pending_data.erase(pending_data.begin(), pending_data.begin() + 1);
 724                         has_metacube_header = false;
 725                         continue;
 726                 }
 727                 if (size > 10485760) {
 728                         log(WARNING, "[%s] Metacube block of %d bytes (flags=%x); corrupted header??",
 729                                 url.c_str(), size, flags);
 730                 }
 731
 732                 // See if we have the entire block. If not, wait for more data.
 733                 if (pending_data.size() < sizeof(metacube2_block_header) + size) {
 734                         return;
 735                 }
 736
 737                 // See if this is a metadata block. If so, we don't want to send it on,
 738                 // but rather process it ourselves.
 739                 // TODO: Keep metadata when sending on to other Metacube users.
 740                 if (flags & METACUBE_FLAGS_METADATA) {
 741                         {
 742                                 lock_guard<mutex> lock(stats_mutex);
 743                                 stats.metadata_bytes_received += size;
 744                         }
 745                         process_metacube_metadata_block(hdr, pending_data.data() + sizeof(hdr), size);
 746                 } else {
 747                         // Send this block on to the servers.
 748                         {
 749                                 lock_guard<mutex> lock(stats_mutex);
 750                                 stats.data_bytes_received += size;
 751                         }
 752                         char *inner_data = pending_data.data() + sizeof(metacube2_block_header);
 753                         if (flags & METACUBE_FLAGS_HEADER) {
 754                                 stream_header = string(inner_data, inner_data + size);
 755                                 for (int stream_index : stream_indices) {
 756                                         servers->set_header(stream_index, http_header, stream_header);
 757                                 }
 758                         }
 759                         for (int stream_index : stream_indices) {
 760                                 servers->add_data(stream_index, inner_data, size, flags, next_block_pts);
 761                         }
 762                         next_block_pts = RationalPTS();
 763                 }
 764
 765                 // Consume the block. This isn't the most efficient way of dealing with things
 766                 // should we have many blocks, but these routines don't need to be too efficient
 767                 // anyway.
 768                 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube2_block_header) + size);
 769                 has_metacube_header = false;
 770         }
 771 }
 772
 773 void HTTPInput::drop_pending_data(size_t num_bytes)
 774 {
 775         if (num_bytes == 0) {
 776                 return;
 777         }
 778         log(WARNING, "[%s] Dropping %lld junk bytes; not a Metacube2 stream, or data was dropped from the middle of the stream.",
 779                 url.c_str(), (long long)num_bytes);
 780         assert(pending_data.size() >= num_bytes);
 781         pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);
 782 }
 783
 784 void HTTPInput::add_destination(int stream_index)
 785 {
 786         stream_indices.push_back(stream_index);
 787         servers->set_header(stream_index, http_header, stream_header);
 788 }
 789
 790 InputStats HTTPInput::get_stats() const
 791 {
 792         lock_guard<mutex> lock(stats_mutex);
 793         return stats;
 794 }
 795
 796 void HTTPInput::process_metacube_metadata_block(const metacube2_block_header &hdr, const char *payload, uint32_t payload_size)
 797 {
 798         if (payload_size < sizeof(uint64_t)) {
 799                 log(WARNING, "[%s] Undersized Metacube metadata block (%d bytes); corrupted header?",
 800                         url.c_str(), payload_size);
 801                 return;
 802         }
 803
 804         uint64_t type = be64toh(*(const uint64_t *)payload);
 805         if (type == METACUBE_METADATA_TYPE_ENCODER_TIMESTAMP) {
 806                 timespec now;
 807                 clock_gettime(CLOCK_REALTIME, &now);
 808
 809                 const metacube2_timestamp_packet *pkt = (const metacube2_timestamp_packet *)payload;
 810                 if (payload_size != sizeof(*pkt)) {
 811                         log(WARNING, "[%s] Metacube timestamp block of wrong size (%d bytes); ignoring.",
 812                                 url.c_str(), payload_size);
 813                         return;
 814                 }
 815
 816                 double elapsed = now.tv_sec - be64toh(pkt->tv_sec) +
 817                         1e-9 * (now.tv_nsec - long(be64toh(pkt->tv_nsec)));
 818                 {
 819                         lock_guard<mutex> lock(stats_mutex);
 820                         stats.latency_sec = elapsed;
 821                 }
 822         } else if (type == METACUBE_METADATA_TYPE_NEXT_BLOCK_PTS) {
 823                 const metacube2_pts_packet *pkt = (const metacube2_pts_packet *)payload;
 824                 if (payload_size != sizeof(*pkt)) {
 825                         log(WARNING, "[%s] Metacube pts block of wrong size (%d bytes); ignoring.",
 826                                 url.c_str(), payload_size);
 827                         return;
 828                 }
 829                 next_block_pts.pts = be64toh(pkt->pts);
 830                 next_block_pts.timebase_num = be64toh(pkt->timebase_num);
 831                 next_block_pts.timebase_den = be64toh(pkt->timebase_den);
 832         } else {
 833                 // Unknown metadata block, ignore
 834                 log(INFO, "[%s] Metadata block %llu\n", url.c_str(), type);
 835                 return;
 836         }
 837 }