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

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