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 <map>
  15 #include <string>
  16 #include <utility>
  17 #include <vector>
  18
  19 #include "httpinput.h"
  20 #include "log.h"
  21 #include "metacube2.h"
  22 #include "mutexlock.h"
  23 #include "parse.h"
  24 #include "serverpool.h"
  25 #include "state.pb.h"
  26 #include "stream.h"
  27 #include "util.h"
  28 #include "version.h"
  29
  30 using namespace std;
  31
  32 extern ServerPool *servers;
  33
  34 namespace {
  35
  36 // Compute b-a.
  37 timespec clock_diff(const timespec &a, const timespec &b)
  38 {
  39         timespec ret;
  40         ret.tv_sec = b.tv_sec - a.tv_sec;
  41         ret.tv_nsec = b.tv_nsec - a.tv_nsec;
  42         if (ret.tv_nsec < 0) {
  43                 ret.tv_sec--;
  44                 ret.tv_nsec += 1000000000;
  45         }
  46         assert(ret.tv_nsec >= 0);
  47         return ret;
  48 }
  49
  50 }  // namespace
  51
  52 HTTPInput::HTTPInput(const string &url)
  53         : state(NOT_CONNECTED),
  54           url(url),
  55           has_metacube_header(false),
  56           sock(-1)
  57 {
  58         pthread_mutex_init(&stats_mutex, NULL);
  59         stats.url = url;
  60         stats.bytes_received = 0;
  61         stats.data_bytes_received = 0;
  62         stats.connect_time = -1;
  63 }
  64
  65 HTTPInput::HTTPInput(const InputProto &serialized)
  66         : state(State(serialized.state())),
  67           url(serialized.url()),
  68           request(serialized.request()),
  69           request_bytes_sent(serialized.request_bytes_sent()),
  70           response(serialized.response()),
  71           http_header(serialized.http_header()),
  72           stream_header(serialized.stream_header()),
  73           has_metacube_header(serialized.has_metacube_header()),
  74           sock(serialized.sock())
  75 {
  76         pending_data.resize(serialized.pending_data().size());
  77         memcpy(&pending_data[0], serialized.pending_data().data(), serialized.pending_data().size());
  78
  79         string protocol, user;
  80         parse_url(url, &protocol, &user, &host, &port, &path);  // Don't care if it fails.
  81
  82         pthread_mutex_init(&stats_mutex, NULL);
  83         stats.url = url;
  84         stats.bytes_received = serialized.bytes_received();
  85         stats.data_bytes_received = serialized.data_bytes_received();
  86         if (serialized.has_connect_time()) {
  87                 stats.connect_time = serialized.connect_time();
  88         } else {
  89                 stats.connect_time = time(NULL);
  90         }
  91 }
  92
  93 void HTTPInput::close_socket()
  94 {
  95         if (sock != -1) {
  96                 safe_close(sock);
  97                 sock = -1;
  98         }
  99
 100         MutexLock lock(&stats_mutex);
 101         stats.connect_time = -1;
 102 }
 103
 104 InputProto HTTPInput::serialize() const
 105 {
 106         InputProto serialized;
 107         serialized.set_state(state);
 108         serialized.set_url(url);
 109         serialized.set_request(request);
 110         serialized.set_request_bytes_sent(request_bytes_sent);
 111         serialized.set_response(response);
 112         serialized.set_http_header(http_header);
 113         serialized.set_stream_header(stream_header);
 114         serialized.set_pending_data(string(pending_data.begin(), pending_data.end()));
 115         serialized.set_has_metacube_header(has_metacube_header);
 116         serialized.set_sock(sock);
 117         serialized.set_bytes_received(stats.bytes_received);
 118         serialized.set_data_bytes_received(stats.data_bytes_received);
 119         serialized.set_connect_time(stats.connect_time);
 120         return serialized;
 121 }
 122
 123 int HTTPInput::lookup_and_connect(const string &host, const string &port)
 124 {
 125         addrinfo *ai;
 126         int err = getaddrinfo(host.c_str(), port.c_str(), NULL, &ai);
 127         if (err != 0) {
 128                 log(WARNING, "[%s] Lookup of '%s' failed (%s).",
 129                         url.c_str(), host.c_str(), gai_strerror(err));
 130                 return -1;
 131         }
 132
 133         addrinfo *base_ai = ai;
 134
 135         // Connect to everything in turn until we have a socket.
 136         for ( ; ai && !should_stop(); ai = ai->ai_next) {
 137                 int sock = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
 138                 if (sock == -1) {
 139                         // Could be e.g. EPROTONOSUPPORT. The show must go on.
 140                         continue;
 141                 }
 142
 143                 // Now do a non-blocking connect. This is important because we want to be able to be
 144                 // woken up, even though it's rather cumbersome.
 145
 146                 // Set the socket as nonblocking.
 147                 int one = 1;
 148                 if (ioctl(sock, FIONBIO, &one) == -1) {
 149                         log_perror("ioctl(FIONBIO)");
 150                         safe_close(sock);
 151                         return -1;
 152                 }
 153
 154                 // Do a non-blocking connect.
 155                 do {
 156                         err = connect(sock, ai->ai_addr, ai->ai_addrlen);
 157                 } while (err == -1 && errno == EINTR);
 158
 159                 if (err == -1 && errno != EINPROGRESS) {
 160                         log_perror("connect");
 161                         safe_close(sock);
 162                         continue;
 163                 }
 164
 165                 // Wait for the connect to complete, or an error to happen.
 166                 for ( ;; ) {
 167                         bool complete = wait_for_activity(sock, POLLIN | POLLOUT, NULL);
 168                         if (should_stop()) {
 169                                 safe_close(sock);
 170                                 return -1;
 171                         }
 172                         if (complete) {
 173                                 break;
 174                         }
 175                 }
 176
 177                 // Check whether it ended in an error or not.
 178                 socklen_t err_size = sizeof(err);
 179                 if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &err_size) == -1) {
 180                         log_perror("getsockopt");
 181                         safe_close(sock);
 182                         continue;
 183                 }
 184
 185                 errno = err;
 186
 187                 if (err == 0) {
 188                         // Successful connect.
 189                         freeaddrinfo(base_ai);
 190                         return sock;
 191                 }
 192
 193                 safe_close(sock);
 194         }
 195
 196         // Give the last one as error.
 197         log(WARNING, "[%s] Connect to '%s' failed (%s)",
 198                 url.c_str(), host.c_str(), strerror(errno));
 199         freeaddrinfo(base_ai);
 200         return -1;
 201 }
 202
 203 bool HTTPInput::parse_response(const std::string &request)
 204 {
 205         vector<string> lines = split_lines(response);
 206         if (lines.empty()) {
 207                 log(WARNING, "[%s] Empty HTTP response from input.", url.c_str());
 208                 return false;
 209         }
 210
 211         vector<string> first_line_tokens = split_tokens(lines[0]);
 212         if (first_line_tokens.size() < 2) {
 213                 log(WARNING, "[%s] Malformed response line '%s' from input.",
 214                         url.c_str(), lines[0].c_str());
 215                 return false;
 216         }
 217
 218         int response = atoi(first_line_tokens[1].c_str());
 219         if (response != 200) {
 220                 log(WARNING, "[%s] Non-200 response '%s' from input.",
 221                         url.c_str(), lines[0].c_str());
 222                 return false;
 223         }
 224
 225         multimap<string, string> parameters;
 226         for (size_t i = 1; i < lines.size(); ++i) {
 227                 size_t split = lines[i].find(":");
 228                 if (split == string::npos) {
 229                         log(WARNING, "[%s] Ignoring malformed HTTP response line '%s'",
 230                                 url.c_str(), lines[i].c_str());
 231                         continue;
 232                 }
 233
 234                 string key(lines[i].begin(), lines[i].begin() + split);
 235
 236                 // Skip any spaces after the colon.
 237                 do {
 238                         ++split;
 239                 } while (split < lines[i].size() && lines[i][split] == ' ');
 240
 241                 string value(lines[i].begin() + split, lines[i].end());
 242
 243                 // Remove “Content-encoding: metacube”.
 244                 // TODO: Make case-insensitive.
 245                 if (key == "Content-encoding" && value == "metacube") {
 246                         continue;
 247                 }
 248
 249                 parameters.insert(make_pair(key, value));
 250         }
 251
 252         // Change “Server: foo” to “Server: metacube/0.1 (reflecting: foo)”
 253         // TODO: Make case-insensitive.
 254         // XXX: Use a Via: instead?
 255         if (parameters.count("Server") == 0) {
 256                 parameters.insert(make_pair("Server", SERVER_IDENTIFICATION));
 257         } else {
 258                 for (multimap<string, string>::iterator it = parameters.begin();
 259                      it != parameters.end();
 260                      ++it) {
 261                         if (it->first != "Server") {
 262                                 continue;
 263                         }
 264                         it->second = SERVER_IDENTIFICATION " (reflecting: " + it->second + ")";
 265                 }
 266         }
 267
 268         // Set “Connection: close”.
 269         // TODO: Make case-insensitive.
 270         parameters.erase("Connection");
 271         parameters.insert(make_pair("Connection", "close"));
 272
 273         // Construct the new HTTP header.
 274         http_header = "HTTP/1.0 200 OK\r\n";
 275         for (multimap<string, string>::iterator it = parameters.begin();
 276              it != parameters.end();
 277              ++it) {
 278                 http_header.append(it->first + ": " + it->second + "\r\n");
 279         }
 280
 281         for (size_t i = 0; i < stream_indices.size(); ++i) {
 282                 servers->set_header(stream_indices[i], http_header, stream_header);
 283         }
 284
 285         return true;
 286 }
 287
 288 void HTTPInput::do_work()
 289 {
 290         timespec last_activity;
 291
 292         // TODO: Make the timeout persist across restarts.
 293         if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
 294                 int err = clock_gettime(CLOCK_MONOTONIC, &last_activity);
 295                 assert(err != -1);
 296         }
 297
 298         while (!should_stop()) {
 299                 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
 300                         // Give the socket 30 seconds since last activity before we time out.
 301                         static const int timeout_secs = 30;
 302
 303                         timespec now;
 304                         int err = clock_gettime(CLOCK_MONOTONIC, &now);
 305                         assert(err != -1);
 306
 307                         timespec elapsed = clock_diff(last_activity, now);
 308                         if (elapsed.tv_sec >= timeout_secs) {
 309                                 // Timeout!
 310                                 log(ERROR, "[%s] Timeout after %d seconds, closing.", url.c_str(), elapsed.tv_sec);
 311                                 state = CLOSING_SOCKET;
 312                                 continue;
 313                         }
 314
 315                         // Basically calculate (30 - (now - last_activity)) = (30 + (last_activity - now)).
 316                         // Add a second of slack to account for differences between clocks.
 317                         timespec timeout = clock_diff(now, last_activity);
 318                         timeout.tv_sec += timeout_secs + 1;
 319                         assert(timeout.tv_sec > 0 || (timeout.tv_sec >= 0 && timeout.tv_nsec > 0));
 320
 321                         bool activity = wait_for_activity(sock, (state == SENDING_REQUEST) ? POLLOUT : POLLIN, &timeout);
 322                         if (activity) {
 323                                 err = clock_gettime(CLOCK_MONOTONIC, &last_activity);
 324                                 assert(err != -1);
 325                         } else {
 326                                 // OK. Most likely, should_stop was set, or we have timed out.
 327                                 continue;
 328                         }
 329                 }
 330
 331                 switch (state) {
 332                 case NOT_CONNECTED:
 333                         request.clear();
 334                         request_bytes_sent = 0;
 335                         response.clear();
 336                         pending_data.clear();
 337                         has_metacube_header = false;
 338                         for (size_t i = 0; i < stream_indices.size(); ++i) {
 339                                 servers->set_header(stream_indices[i], "", "");
 340                         }
 341
 342                         {
 343                                 string protocol, user;  // Thrown away.
 344                                 if (!parse_url(url, &protocol, &user, &host, &port, &path)) {
 345                                         log(WARNING, "[%s] Failed to parse URL '%s'", url.c_str(), url.c_str());
 346                                         break;
 347                                 }
 348                         }
 349
 350                         sock = lookup_and_connect(host, port);
 351                         if (sock != -1) {
 352                                 // Yay, successful connect. Try to set it as nonblocking.
 353                                 int one = 1;
 354                                 if (ioctl(sock, FIONBIO, &one) == -1) {
 355                                         log_perror("ioctl(FIONBIO)");
 356                                         state = CLOSING_SOCKET;
 357                                 } else {
 358                                         state = SENDING_REQUEST;
 359                                         request = "GET " + path + " HTTP/1.0\r\nUser-Agent: cubemap\r\n\r\n";
 360                                         request_bytes_sent = 0;
 361                                 }
 362
 363                                 MutexLock lock(&stats_mutex);
 364                                 stats.connect_time = time(NULL);
 365                                 clock_gettime(CLOCK_MONOTONIC, &last_activity);
 366                         }
 367                         break;
 368                 case SENDING_REQUEST: {
 369                         size_t to_send = request.size() - request_bytes_sent;
 370                         int ret;
 371
 372                         do {
 373                                 ret = write(sock, request.data() + request_bytes_sent, to_send);
 374                         } while (ret == -1 && errno == EINTR);
 375
 376                         if (ret == -1) {
 377                                 log_perror("write");
 378                                 state = CLOSING_SOCKET;
 379                                 continue;
 380                         }
 381
 382                         assert(ret >= 0);
 383                         request_bytes_sent += ret;
 384
 385                         if (request_bytes_sent == request.size()) {
 386                                 state = RECEIVING_HEADER;
 387                         }
 388                         break;
 389                 }
 390                 case RECEIVING_HEADER: {
 391                         char buf[4096];
 392                         int ret;
 393
 394                         do {
 395                                 ret = read(sock, buf, sizeof(buf));
 396                         } while (ret == -1 && errno == EINTR);
 397
 398                         if (ret == -1) {
 399                                 log_perror("read");
 400                                 state = CLOSING_SOCKET;
 401                                 continue;
 402                         }
 403
 404                         if (ret == 0) {
 405                                 // This really shouldn't happen...
 406                                 log(ERROR, "[%s] Socket unexpectedly closed while reading header",
 407                                            url.c_str());
 408                                 state = CLOSING_SOCKET;
 409                                 continue;
 410                         }
 411
 412                         RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
 413
 414                         if (status == RP_OUT_OF_SPACE) {
 415                                 log(WARNING, "[%s] Server sent overlong HTTP response!", url.c_str());
 416                                 state = CLOSING_SOCKET;
 417                                 continue;
 418                         } else if (status == RP_NOT_FINISHED_YET) {
 419                                 continue;
 420                         }
 421
 422                         // OK, so we're fine, but there might be some of the actual data after the response.
 423                         // We'll need to deal with that separately.
 424                         string extra_data;
 425                         if (status == RP_EXTRA_DATA) {
 426                                 char *ptr = static_cast<char *>(
 427                                         memmem(response.data(), response.size(), "\r\n\r\n", 4));
 428                                 assert(ptr != NULL);
 429                                 extra_data = string(ptr + 4, &response[0] + response.size());
 430                                 response.resize(ptr - response.data());
 431                         }
 432
 433                         if (!parse_response(response)) {
 434                                 state = CLOSING_SOCKET;
 435                                 continue;
 436                         }
 437
 438                         if (!extra_data.empty()) {
 439                                 process_data(&extra_data[0], extra_data.size());
 440                         }
 441
 442                         log(INFO, "[%s] Connected to '%s', receiving data.",
 443                                    url.c_str(), url.c_str());
 444                         state = RECEIVING_DATA;
 445                         break;
 446                 }
 447                 case RECEIVING_DATA: {
 448                         char buf[4096];
 449                         int ret;
 450
 451                         do {
 452                                 ret = read(sock, buf, sizeof(buf));
 453                         } while (ret == -1 && errno == EINTR);
 454
 455                         if (ret == -1) {
 456                                 log_perror("read");
 457                                 state = CLOSING_SOCKET;
 458                                 continue;
 459                         }
 460
 461                         if (ret == 0) {
 462                                 // This really shouldn't happen...
 463                                 log(ERROR, "[%s] Socket unexpectedly closed while reading data",
 464                                            url.c_str());
 465                                 state = CLOSING_SOCKET;
 466                                 continue;
 467                         }
 468
 469                         process_data(buf, ret);
 470                         break;
 471                 }
 472                 case CLOSING_SOCKET: {
 473                         close_socket();
 474                         state = NOT_CONNECTED;
 475                         break;
 476                 }
 477                 default:
 478                         assert(false);
 479                 }
 480
 481                 // If we are still in NOT_CONNECTED, either something went wrong,
 482                 // or the connection just got closed.
 483                 // The earlier steps have already given the error message, if any.
 484                 if (state == NOT_CONNECTED && !should_stop()) {
 485                         log(INFO, "[%s] Waiting 0.2 second and restarting...", url.c_str());
 486                         timespec timeout_ts;
 487                         timeout_ts.tv_sec = 0;
 488                         timeout_ts.tv_nsec = 200000000;
 489                         wait_for_wakeup(&timeout_ts);
 490                 }
 491         }
 492 }
 493
 494 void HTTPInput::process_data(char *ptr, size_t bytes)
 495 {
 496         pending_data.insert(pending_data.end(), ptr, ptr + bytes);
 497         {
 498                 MutexLock mutex(&stats_mutex);
 499                 stats.bytes_received += bytes;
 500         }
 501
 502         for ( ;; ) {
 503                 // If we don't have enough data (yet) for even the Metacube header, just return.
 504                 if (pending_data.size() < sizeof(metacube2_block_header)) {
 505                         return;
 506                 }
 507
 508                 // Make sure we have the Metacube sync header at the start.
 509                 // We may need to skip over junk data (it _should_ not happen, though).
 510                 if (!has_metacube_header) {
 511                         char *ptr = static_cast<char *>(
 512                                 memmem(pending_data.data(), pending_data.size(),
 513                                        METACUBE2_SYNC, strlen(METACUBE2_SYNC)));
 514                         if (ptr == NULL) {
 515                                 // OK, so we didn't find the sync marker. We know then that
 516                                 // we do not have the _full_ marker in the buffer, but we
 517                                 // could have N-1 bytes. Drop everything before that,
 518                                 // and then give up.
 519                                 drop_pending_data(pending_data.size() - (strlen(METACUBE2_SYNC) - 1));
 520                                 return;
 521                         } else {
 522                                 // Yay, we found the header. Drop everything (if anything) before it.
 523                                 drop_pending_data(ptr - pending_data.data());
 524                                 has_metacube_header = true;
 525
 526                                 // Re-check that we have the entire header; we could have dropped data.
 527                                 if (pending_data.size() < sizeof(metacube2_block_header)) {
 528                                         return;
 529                                 }
 530                         }
 531                 }
 532
 533                 // Now it's safe to read the header.
 534                 metacube2_block_header hdr;
 535                 memcpy(&hdr, pending_data.data(), sizeof(hdr));
 536                 assert(memcmp(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync)) == 0);
 537                 uint32_t size = ntohl(hdr.size);
 538                 uint16_t flags = ntohs(hdr.flags);
 539                 uint16_t expected_csum = metacube2_compute_crc(&hdr);
 540
 541                 if (expected_csum != ntohs(hdr.csum)) {
 542                         log(WARNING, "[%s] Metacube checksum failed (expected 0x%x, got 0x%x), "
 543                                 "not reading block claiming to be %d bytes (flags=%x).",
 544                                 url.c_str(), expected_csum, ntohs(hdr.csum),
 545                                 size, flags);
 546
 547                         // Drop only the first byte, and let the rest of the code handle resync.
 548                         pending_data.erase(pending_data.begin(), pending_data.begin() + 1);
 549                         has_metacube_header = false;
 550                         continue;
 551                 }
 552                 if (size > 1048576) {
 553                         log(WARNING, "[%s] Metacube block of %d bytes (flags=%x); corrupted header?",
 554                                 url.c_str(), size, flags);
 555                 }
 556
 557                 // See if we have the entire block. If not, wait for more data.
 558                 if (pending_data.size() < sizeof(metacube2_block_header) + size) {
 559                         return;
 560                 }
 561
 562                 // Send this block on to the servers.
 563                 {
 564                         MutexLock lock(&stats_mutex);
 565                         stats.data_bytes_received += size;
 566                 }
 567                 char *inner_data = pending_data.data() + sizeof(metacube2_block_header);
 568                 if (flags & METACUBE_FLAGS_HEADER) {
 569                         stream_header = string(inner_data, inner_data + size);
 570                         for (size_t i = 0; i < stream_indices.size(); ++i) {
 571                                 servers->set_header(stream_indices[i], http_header, stream_header);
 572                         }
 573                 } else {
 574                         StreamStartSuitability suitable_for_stream_start;
 575                         if (flags & METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START) {
 576                                 suitable_for_stream_start = NOT_SUITABLE_FOR_STREAM_START;
 577                         } else {
 578                                 suitable_for_stream_start = SUITABLE_FOR_STREAM_START;
 579                         }
 580                         for (size_t i = 0; i < stream_indices.size(); ++i) {
 581                                 servers->add_data(stream_indices[i], inner_data, size, suitable_for_stream_start);
 582                         }
 583                 }
 584
 585                 // Consume the block. This isn't the most efficient way of dealing with things
 586                 // should we have many blocks, but these routines don't need to be too efficient
 587                 // anyway.
 588                 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube2_block_header) + size);
 589                 has_metacube_header = false;
 590         }
 591 }
 592
 593 void HTTPInput::drop_pending_data(size_t num_bytes)
 594 {
 595         if (num_bytes == 0) {
 596                 return;
 597         }
 598         log(WARNING, "[%s] Dropping %lld junk bytes from stream, maybe it is not a Metacube2 stream?",
 599                 url.c_str(), (long long)num_bytes);
 600         assert(pending_data.size() >= num_bytes);
 601         pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);
 602 }
 603
 604 void HTTPInput::add_destination(int stream_index)
 605 {
 606         stream_indices.push_back(stream_index);
 607         servers->set_header(stream_index, http_header, stream_header);
 608 }
 609
 610 InputStats HTTPInput::get_stats() const
 611 {
 612         MutexLock lock(&stats_mutex);
 613         return stats;
 614 }