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 {
  54         pthread_mutex_init(&stats_mutex, nullptr);
  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         pending_data.resize(serialized.pending_data().size());
  78         memcpy(&pending_data[0], serialized.pending_data().data(), serialized.pending_data().size());
  79
  80         string protocol, user;
  81         parse_url(url, &protocol, &user, &host, &port, &path);  // Don't care if it fails.
  82
  83         pthread_mutex_init(&stats_mutex, nullptr);
  84         stats.url = url;
  85         stats.bytes_received = serialized.bytes_received();
  86         stats.data_bytes_received = serialized.data_bytes_received();
  87         stats.metadata_bytes_received = serialized.metadata_bytes_received();
  88         if (serialized.has_connect_time()) {
  89                 stats.connect_time = serialized.connect_time();
  90         } else {
  91                 stats.connect_time = time(nullptr);
  92         }
  93         if (serialized.has_latency_sec()) {
  94                 stats.latency_sec = serialized.latency_sec();
  95         } else {
  96                 stats.latency_sec = HUGE_VAL;
  97         }
  98
  99         last_verbose_connection.tv_sec = -3600;
 100         last_verbose_connection.tv_nsec = 0;
 101 }
 102
 103 void HTTPInput::close_socket()
 104 {
 105         if (sock != -1) {
 106                 safe_close(sock);
 107                 sock = -1;
 108         }
 109
 110         MutexLock lock(&stats_mutex);
 111         stats.connect_time = -1;
 112 }
 113
 114 InputProto HTTPInput::serialize() const
 115 {
 116         InputProto serialized;
 117         serialized.set_state(state);
 118         serialized.set_url(url);
 119         serialized.set_request(request);
 120         serialized.set_request_bytes_sent(request_bytes_sent);
 121         serialized.set_response(response);
 122         serialized.set_http_header(http_header);
 123         serialized.set_stream_header(stream_header);
 124         serialized.set_pending_data(string(pending_data.begin(), pending_data.end()));
 125         serialized.set_has_metacube_header(has_metacube_header);
 126         serialized.set_sock(sock);
 127         serialized.set_bytes_received(stats.bytes_received);
 128         serialized.set_data_bytes_received(stats.data_bytes_received);
 129         if (isfinite(stats.latency_sec)) {
 130                 serialized.set_latency_sec(stats.latency_sec);
 131         }
 132         serialized.set_connect_time(stats.connect_time);
 133         if (encoding == Input::INPUT_ENCODING_METACUBE) {
 134                 serialized.set_is_metacube_encoded(true);
 135         } else {
 136                 assert(encoding == Input::INPUT_ENCODING_RAW);
 137                 serialized.set_is_metacube_encoded(false);
 138         }
 139         return serialized;
 140 }
 141
 142 int HTTPInput::lookup_and_connect(const string &host, const string &port)
 143 {
 144         addrinfo *ai;
 145         int err = getaddrinfo(host.c_str(), port.c_str(), nullptr, &ai);
 146         if (err != 0) {
 147                 if (!suppress_logging) {
 148                         log(WARNING, "[%s] Lookup of '%s' failed (%s).",
 149                                 url.c_str(), host.c_str(), gai_strerror(err));
 150                 }
 151                 return -1;
 152         }
 153
 154         addrinfo *base_ai = ai;
 155
 156         // Connect to everything in turn until we have a socket.
 157         for ( ; ai && !should_stop(); ai = ai->ai_next) {
 158                 int sock = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
 159                 if (sock == -1) {
 160                         // Could be e.g. EPROTONOSUPPORT. The show must go on.
 161                         continue;
 162                 }
 163
 164                 // Now do a non-blocking connect. This is important because we want to be able to be
 165                 // woken up, even though it's rather cumbersome.
 166
 167                 // Set the socket as nonblocking.
 168                 int one = 1;
 169                 if (ioctl(sock, FIONBIO, &one) == -1) {
 170                         log_perror("ioctl(FIONBIO)");
 171                         safe_close(sock);
 172                         return -1;
 173                 }
 174
 175                 // Do a non-blocking connect.
 176                 do {
 177                         err = connect(sock, ai->ai_addr, ai->ai_addrlen);
 178                 } while (err == -1 && errno == EINTR);
 179
 180                 if (err == -1 && errno != EINPROGRESS) {
 181                         log_perror("connect");
 182                         safe_close(sock);
 183                         continue;
 184                 }
 185
 186                 // Wait for the connect to complete, or an error to happen.
 187                 for ( ;; ) {
 188                         bool complete = wait_for_activity(sock, POLLIN | POLLOUT, nullptr);
 189                         if (should_stop()) {
 190                                 safe_close(sock);
 191                                 return -1;
 192                         }
 193                         if (complete) {
 194                                 break;
 195                         }
 196                 }
 197
 198                 // Check whether it ended in an error or not.
 199                 socklen_t err_size = sizeof(err);
 200                 if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &err_size) == -1) {
 201                         log_perror("getsockopt");
 202                         safe_close(sock);
 203                         continue;
 204                 }
 205
 206                 errno = err;
 207
 208                 if (err == 0) {
 209                         // Successful connect.
 210                         freeaddrinfo(base_ai);
 211                         return sock;
 212                 }
 213
 214                 safe_close(sock);
 215         }
 216
 217         // Give the last one as error.
 218         if (!suppress_logging) {
 219                 log(WARNING, "[%s] Connect to '%s' failed (%s)",
 220                         url.c_str(), host.c_str(), strerror(errno));
 221         }
 222         freeaddrinfo(base_ai);
 223         return -1;
 224 }
 225
 226 bool HTTPInput::parse_response(const string &request)
 227 {
 228         vector<string> lines = split_lines(response);
 229         if (lines.empty()) {
 230                 if (!suppress_logging) {
 231                         log(WARNING, "[%s] Empty HTTP response from input.", url.c_str());
 232                 }
 233                 return false;
 234         }
 235
 236         vector<string> first_line_tokens = split_tokens(lines[0]);
 237         if (first_line_tokens.size() < 2) {
 238                 if (!suppress_logging) {
 239                         log(WARNING, "[%s] Malformed response line '%s' from input.",
 240                                 url.c_str(), lines[0].c_str());
 241                 }
 242                 return false;
 243         }
 244
 245         int response = atoi(first_line_tokens[1].c_str());
 246         if (response != 200) {
 247                 if (!suppress_logging) {
 248                         log(WARNING, "[%s] Non-200 response '%s' from input.",
 249                                 url.c_str(), lines[0].c_str());
 250                 }
 251                 return false;
 252         }
 253
 254         multimap<string, string> parameters = extract_headers(lines, url);
 255
 256         // Remove “Content-encoding: metacube”.
 257         // TODO: Make case-insensitive.
 258         const auto encoding_it = parameters.find("Content-encoding");
 259         if (encoding_it != parameters.end() && encoding_it->second == "metacube") {
 260                 parameters.erase(encoding_it);
 261         }
 262
 263         // Change “Server: foo” to “Server: metacube/0.1 (reflecting: foo)”
 264         // TODO: Make case-insensitive.
 265         // XXX: Use a Via: instead?
 266         if (parameters.count("Server") == 0) {
 267                 parameters.insert(make_pair("Server", SERVER_IDENTIFICATION));
 268         } else {
 269                 for (auto &key_and_value : parameters) {
 270                         if (key_and_value.first != "Server") {
 271                                 continue;
 272                         }
 273                         key_and_value.second = SERVER_IDENTIFICATION " (reflecting: " + key_and_value.second + ")";
 274                 }
 275         }
 276
 277         // Set “Connection: close”.
 278         // TODO: Make case-insensitive.
 279         parameters.erase("Connection");
 280         parameters.insert(make_pair("Connection", "close"));
 281
 282         // Construct the new HTTP header.
 283         http_header = "HTTP/1.0 200 OK\r\n";
 284         for (const auto &key_and_value : parameters) {
 285                 http_header.append(key_and_value.first + ": " + key_and_value.second + "\r\n");
 286         }
 287
 288         for (int stream_index : stream_indices) {
 289                 servers->set_header(stream_index, http_header, stream_header);
 290         }
 291
 292         return true;
 293 }
 294
 295 void HTTPInput::do_work()
 296 {
 297         timespec last_activity;
 298
 299         // TODO: Make the timeout persist across restarts.
 300         if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
 301                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
 302                 assert(err != -1);
 303         }
 304
 305         while (!should_stop()) {
 306                 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
 307                         // Give the socket 30 seconds since last activity before we time out.
 308                         static const int timeout_secs = 30;
 309
 310                         timespec now;
 311                         int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &now);
 312                         assert(err != -1);
 313
 314                         timespec elapsed = clock_diff(last_activity, now);
 315                         if (elapsed.tv_sec >= timeout_secs) {
 316                                 // Timeout!
 317                                 if (!suppress_logging) {
 318                                         log(ERROR, "[%s] Timeout after %d seconds, closing.", url.c_str(), elapsed.tv_sec);
 319                                 }
 320                                 state = CLOSING_SOCKET;
 321                                 continue;
 322                         }
 323
 324                         // Basically calculate (30 - (now - last_activity)) = (30 + (last_activity - now)).
 325                         // Add a second of slack to account for differences between clocks.
 326                         timespec timeout = clock_diff(now, last_activity);
 327                         timeout.tv_sec += timeout_secs + 1;
 328                         assert(timeout.tv_sec > 0 || (timeout.tv_sec >= 0 && timeout.tv_nsec > 0));
 329
 330                         bool activity = wait_for_activity(sock, (state == SENDING_REQUEST) ? POLLOUT : POLLIN, &timeout);
 331                         if (activity) {
 332                                 err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
 333                                 assert(err != -1);
 334                         } else {
 335                                 // OK. Most likely, should_stop was set, or we have timed out.
 336                                 continue;
 337                         }
 338                 }
 339
 340                 switch (state) {
 341                 case NOT_CONNECTED:
 342                         request.clear();
 343                         request_bytes_sent = 0;
 344                         response.clear();
 345                         pending_data.clear();
 346                         has_metacube_header = false;
 347                         for (int stream_index : stream_indices) {
 348                                 servers->set_header(stream_index, "", "");
 349                         }
 350
 351                         {
 352                                 string protocol, user;  // Thrown away.
 353                                 if (!parse_url(url, &protocol, &user, &host, &port, &path)) {
 354                                         if (!suppress_logging) {
 355                                                 log(WARNING, "[%s] Failed to parse URL '%s'", url.c_str(), url.c_str());
 356                                         }
 357                                         break;
 358                                 }
 359
 360                                 // Remove the brackets around IPv6 address literals.
 361                                 // TODO: See if we can join this with the code in parse_ip_address(),
 362                                 // or maybe even more it into parse_url().
 363                                 if (!host.empty() && host[0] == '[' && host[host.size() - 1] == ']') {
 364                                         host = host.substr(1, host.size() - 2);
 365                                 }
 366                         }
 367
 368                         if (suppress_logging) {
 369                                 // See if there's more than one minute since last time we made a connection
 370                                 // with logging enabled. If so, turn it on again.
 371                                 timespec now;
 372                                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &now);
 373                                 assert(err != -1);
 374
 375                                 double elapsed = now.tv_sec - last_verbose_connection.tv_sec +
 376                                         1e-9 * (now.tv_nsec - last_verbose_connection.tv_nsec);
 377                                 if (elapsed > 60.0) {
 378                                         suppress_logging = false;
 379                                 }
 380                         }
 381                         if (!suppress_logging) {
 382                                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_verbose_connection);
 383                                 assert(err != -1);
 384                         }
 385                         ++num_connection_attempts;
 386                         sock = lookup_and_connect(host, port);
 387                         if (sock != -1) {
 388                                 // Yay, successful connect. Try to set it as nonblocking.
 389                                 int one = 1;
 390                                 if (ioctl(sock, FIONBIO, &one) == -1) {
 391                                         log_perror("ioctl(FIONBIO)");
 392                                         state = CLOSING_SOCKET;
 393                                 } else {
 394                                         state = SENDING_REQUEST;
 395                                         request = "GET " + path + " HTTP/1.0\r\nHost: " + host_header(host, port) + "\r\nUser-Agent: cubemap\r\n\r\n";
 396                                         request_bytes_sent = 0;
 397                                 }
 398
 399                                 MutexLock lock(&stats_mutex);
 400                                 stats.connect_time = time(nullptr);
 401                                 clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
 402                         }
 403                         break;
 404                 case SENDING_REQUEST: {
 405                         size_t to_send = request.size() - request_bytes_sent;
 406                         int ret;
 407
 408                         do {
 409                                 ret = write(sock, request.data() + request_bytes_sent, to_send);
 410                         } while (ret == -1 && errno == EINTR);
 411
 412                         if (ret == -1) {
 413                                 log_perror("write");
 414                                 state = CLOSING_SOCKET;
 415                                 continue;
 416                         }
 417
 418                         assert(ret >= 0);
 419                         request_bytes_sent += ret;
 420
 421                         if (request_bytes_sent == request.size()) {
 422                                 state = RECEIVING_HEADER;
 423                         }
 424                         break;
 425                 }
 426                 case RECEIVING_HEADER: {
 427                         char buf[4096];
 428                         int ret;
 429
 430                         do {
 431                                 ret = read(sock, buf, sizeof(buf));
 432                         } while (ret == -1 && errno == EINTR);
 433
 434                         if (ret == -1) {
 435                                 log_perror("read");
 436                                 state = CLOSING_SOCKET;
 437                                 continue;
 438                         }
 439
 440                         if (ret == 0) {
 441                                 // This really shouldn't happen...
 442                                 if (!suppress_logging) {
 443                                         log(ERROR, "[%s] Socket unexpectedly closed while reading header",
 444                                                    url.c_str());
 445                                 }
 446                                 state = CLOSING_SOCKET;
 447                                 continue;
 448                         }
 449
 450                         RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
 451
 452                         if (status == RP_OUT_OF_SPACE) {
 453                                 if (!suppress_logging) {
 454                                         log(WARNING, "[%s] Server sent overlong HTTP response!", url.c_str());
 455                                 }
 456                                 state = CLOSING_SOCKET;
 457                                 continue;
 458                         } else if (status == RP_NOT_FINISHED_YET) {
 459                                 continue;
 460                         }
 461
 462                         // OK, so we're fine, but there might be some of the actual data after the response.
 463                         // We'll need to deal with that separately.
 464                         string extra_data;
 465                         if (status == RP_EXTRA_DATA) {
 466                                 char *ptr = static_cast<char *>(
 467                                         memmem(response.data(), response.size(), "\r\n\r\n", 4));
 468                                 assert(ptr != nullptr);
 469                                 extra_data = string(ptr + 4, &response[0] + response.size());
 470                                 response.resize(ptr - response.data());
 471                         }
 472
 473                         if (!parse_response(response)) {
 474                                 state = CLOSING_SOCKET;
 475                                 continue;
 476                         }
 477
 478                         if (!extra_data.empty()) {
 479                                 process_data(&extra_data[0], extra_data.size());
 480                         }
 481
 482                         if (!suppress_logging) {
 483                                 if (encoding == Input::INPUT_ENCODING_RAW) {
 484                                         log(INFO, "[%s] Connected to '%s', receiving raw data.",
 485                                                    url.c_str(), url.c_str());
 486                                 } else {
 487                                         assert(encoding == Input::INPUT_ENCODING_METACUBE);
 488                                         log(INFO, "[%s] Connected to '%s', receiving data.",
 489                                                    url.c_str(), url.c_str());
 490                                 }
 491                         }
 492                         state = RECEIVING_DATA;
 493                         break;
 494                 }
 495                 case RECEIVING_DATA: {
 496                         char buf[4096];
 497                         int ret;
 498
 499                         do {
 500                                 ret = read(sock, buf, sizeof(buf));
 501                         } while (ret == -1 && errno == EINTR);
 502
 503                         if (ret == -1) {
 504                                 log_perror("read");
 505                                 state = CLOSING_SOCKET;
 506                                 continue;
 507                         }
 508
 509                         if (ret == 0) {
 510                                 // This really shouldn't happen...
 511                                 if (!suppress_logging) {
 512                                         log(ERROR, "[%s] Socket unexpectedly closed while reading data",
 513                                                    url.c_str());
 514                                 }
 515                                 state = CLOSING_SOCKET;
 516                                 continue;
 517                         }
 518
 519                         num_connection_attempts = 0;  // Reset, since we have a successful read.
 520                         if (suppress_logging) {
 521                                 // This was suppressed earlier, so print it out now.
 522                                 if (encoding == Input::INPUT_ENCODING_RAW) {
 523                                         log(INFO, "[%s] Connected to '%s', receiving raw data.",
 524                                                    url.c_str(), url.c_str());
 525                                 } else {
 526                                         assert(encoding == Input::INPUT_ENCODING_METACUBE);
 527                                         log(INFO, "[%s] Connected to '%s', receiving data.",
 528                                                    url.c_str(), url.c_str());
 529                                 }
 530                                 suppress_logging = false;
 531                         }
 532
 533                         process_data(buf, ret);
 534                         break;
 535                 }
 536                 case CLOSING_SOCKET: {
 537                         close_socket();
 538                         state = NOT_CONNECTED;
 539                         break;
 540                 }
 541                 default:
 542                         assert(false);
 543                 }
 544
 545                 // If we are still in NOT_CONNECTED, either something went wrong,
 546                 // or the connection just got closed.
 547                 // The earlier steps have already given the error message, if any.
 548                 if (state == NOT_CONNECTED && !should_stop()) {
 549                         if (!suppress_logging) {
 550                                 log(INFO, "[%s] Waiting 0.2 seconds and restarting...", url.c_str());
 551                         }
 552
 553                         if (num_connection_attempts >= 3 && !suppress_logging) {
 554                                 log(INFO, "[%s] %d failed connection attempts, suppressing logging for one minute.",
 555                                         url.c_str(), num_connection_attempts);
 556                                 suppress_logging = true;
 557                         }
 558                         timespec timeout_ts;
 559                         timeout_ts.tv_sec = 0;
 560                         timeout_ts.tv_nsec = 200000000;
 561                         wait_for_wakeup(&timeout_ts);
 562                 }
 563         }
 564 }
 565
 566 void HTTPInput::process_data(char *ptr, size_t bytes)
 567 {
 568         {
 569                 MutexLock mutex(&stats_mutex);
 570                 stats.bytes_received += bytes;
 571         }
 572
 573         if (encoding == Input::INPUT_ENCODING_RAW) {
 574                 for (int stream_index : stream_indices) {
 575                         servers->add_data(stream_index, ptr, bytes, /*metacube_flags=*/0);
 576                 }
 577                 return;
 578         }
 579
 580         assert(encoding == Input::INPUT_ENCODING_METACUBE);
 581         pending_data.insert(pending_data.end(), ptr, ptr + bytes);
 582
 583         for ( ;; ) {
 584                 // If we don't have enough data (yet) for even the Metacube header, just return.
 585                 if (pending_data.size() < sizeof(metacube2_block_header)) {
 586                         return;
 587                 }
 588
 589                 // Make sure we have the Metacube sync header at the start.
 590                 // We may need to skip over junk data (it _should_ not happen, though).
 591                 if (!has_metacube_header) {
 592                         char *ptr = static_cast<char *>(
 593                                 memmem(pending_data.data(), pending_data.size(),
 594                                        METACUBE2_SYNC, strlen(METACUBE2_SYNC)));
 595                         if (ptr == nullptr) {
 596                                 // OK, so we didn't find the sync marker. We know then that
 597                                 // we do not have the _full_ marker in the buffer, but we
 598                                 // could have N-1 bytes. Drop everything before that,
 599                                 // and then give up.
 600                                 drop_pending_data(pending_data.size() - (strlen(METACUBE2_SYNC) - 1));
 601                                 return;
 602                         } else {
 603                                 // Yay, we found the header. Drop everything (if anything) before it.
 604                                 drop_pending_data(ptr - pending_data.data());
 605                                 has_metacube_header = true;
 606
 607                                 // Re-check that we have the entire header; we could have dropped data.
 608                                 if (pending_data.size() < sizeof(metacube2_block_header)) {
 609                                         return;
 610                                 }
 611                         }
 612                 }
 613
 614                 // Now it's safe to read the header.
 615                 metacube2_block_header hdr;
 616                 memcpy(&hdr, pending_data.data(), sizeof(hdr));
 617                 assert(memcmp(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync)) == 0);
 618                 uint32_t size = ntohl(hdr.size);
 619                 uint16_t flags = ntohs(hdr.flags);
 620                 uint16_t expected_csum = metacube2_compute_crc(&hdr);
 621
 622                 if (expected_csum != ntohs(hdr.csum)) {
 623                         log(WARNING, "[%s] Metacube checksum failed (expected 0x%x, got 0x%x), "
 624                                 "not reading block claiming to be %d bytes (flags=%x).",
 625                                 url.c_str(), expected_csum, ntohs(hdr.csum),
 626                                 size, flags);
 627
 628                         // Drop only the first byte, and let the rest of the code handle resync.
 629                         pending_data.erase(pending_data.begin(), pending_data.begin() + 1);
 630                         has_metacube_header = false;
 631                         continue;
 632                 }
 633                 if (size > 10485760) {
 634                         log(WARNING, "[%s] Metacube block of %d bytes (flags=%x); corrupted header??",
 635                                 url.c_str(), size, flags);
 636                 }
 637
 638                 // See if we have the entire block. If not, wait for more data.
 639                 if (pending_data.size() < sizeof(metacube2_block_header) + size) {
 640                         return;
 641                 }
 642
 643                 // See if this is a metadata block. If so, we don't want to send it on,
 644                 // but rather process it ourselves.
 645                 // TODO: Keep metadata when sending on to other Metacube users.
 646                 if (flags & METACUBE_FLAGS_METADATA) {
 647                         {
 648                                 MutexLock lock(&stats_mutex);
 649                                 stats.metadata_bytes_received += size;
 650                         }
 651                         process_metacube_metadata_block(hdr, pending_data.data() + sizeof(hdr), size);
 652                 } else {
 653                         // Send this block on to the servers.
 654                         {
 655                                 MutexLock lock(&stats_mutex);
 656                                 stats.data_bytes_received += size;
 657                         }
 658                         char *inner_data = pending_data.data() + sizeof(metacube2_block_header);
 659                         if (flags & METACUBE_FLAGS_HEADER) {
 660                                 stream_header = string(inner_data, inner_data + size);
 661                                 for (int stream_index : stream_indices) {
 662                                         servers->set_header(stream_index, http_header, stream_header);
 663                                 }
 664                         }
 665                         for (int stream_index : stream_indices) {
 666                                 servers->add_data(stream_index, inner_data, size, flags);
 667                         }
 668                 }
 669
 670                 // Consume the block. This isn't the most efficient way of dealing with things
 671                 // should we have many blocks, but these routines don't need to be too efficient
 672                 // anyway.
 673                 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube2_block_header) + size);
 674                 has_metacube_header = false;
 675         }
 676 }
 677
 678 void HTTPInput::drop_pending_data(size_t num_bytes)
 679 {
 680         if (num_bytes == 0) {
 681                 return;
 682         }
 683         log(WARNING, "[%s] Dropping %lld junk bytes; not a Metacube2 stream, or data was dropped from the middle of the stream.",
 684                 url.c_str(), (long long)num_bytes);
 685         assert(pending_data.size() >= num_bytes);
 686         pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);
 687 }
 688
 689 void HTTPInput::add_destination(int stream_index)
 690 {
 691         stream_indices.push_back(stream_index);
 692         servers->set_header(stream_index, http_header, stream_header);
 693 }
 694
 695 InputStats HTTPInput::get_stats() const
 696 {
 697         MutexLock lock(&stats_mutex);
 698         return stats;
 699 }
 700
 701 void HTTPInput::process_metacube_metadata_block(const metacube2_block_header &hdr, const char *payload, uint32_t payload_size)
 702 {
 703         if (payload_size < sizeof(uint64_t)) {
 704                 log(WARNING, "[%s] Undersized Metacube metadata block (%d bytes); corrupted header?",
 705                         url.c_str(), payload_size);
 706                 return;
 707         }
 708
 709         uint64_t type = be64toh(*(const uint64_t *)payload);
 710         if (type != METACUBE_METADATA_TYPE_ENCODER_TIMESTAMP) {
 711                 // Unknown metadata block, ignore.
 712                 return;
 713         }
 714
 715         timespec now;
 716         clock_gettime(CLOCK_REALTIME, &now);
 717
 718         const metacube2_timestamp_packet *pkt = (const metacube2_timestamp_packet *)payload;
 719         if (payload_size != sizeof(*pkt)) {
 720                 log(WARNING, "[%s] Metacube timestamp block of wrong size (%d bytes); ignoring.",
 721                         url.c_str(), payload_size);
 722                 return;
 723         }
 724
 725         double elapsed = now.tv_sec - be64toh(pkt->tv_sec) +
 726                 1e-9 * (now.tv_nsec - long(be64toh(pkt->tv_nsec)));
 727         {
 728                 MutexLock lock(&stats_mutex);
 729                 stats.latency_sec = elapsed;
 730         }
 731 }