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;
  80         parse_url(url, &protocol, &host, &port, &path);  // Don't care if it fails.
  81
  82         // Older versions stored the extra \r\n in the HTTP header.
  83         // Strip it if we find it.
  84         if (http_header.size() >= 4 &&
  85             memcmp(http_header.data() + http_header.size() - 4, "\r\n\r\n", 4) == 0) {
  86                 http_header.resize(http_header.size() - 2);
  87         }
  88
  89         pthread_mutex_init(&stats_mutex, NULL);
  90         stats.url = url;
  91         stats.bytes_received = serialized.bytes_received();
  92         stats.data_bytes_received = serialized.data_bytes_received();
  93         if (serialized.has_connect_time()) {
  94                 stats.connect_time = serialized.connect_time();
  95         } else {
  96                 stats.connect_time = time(NULL);
  97         }
  98 }
  99
 100 void HTTPInput::close_socket()
 101 {
 102         if (sock != -1) {
 103                 safe_close(sock);
 104         }
 105
 106         MutexLock lock(&stats_mutex);
 107         stats.connect_time = -1;
 108 }
 109
 110 InputProto HTTPInput::serialize() const
 111 {
 112         InputProto serialized;
 113         serialized.set_state(state);
 114         serialized.set_url(url);
 115         serialized.set_request(request);
 116         serialized.set_request_bytes_sent(request_bytes_sent);
 117         serialized.set_response(response);
 118         serialized.set_http_header(http_header);
 119         serialized.set_stream_header(stream_header);
 120         serialized.set_pending_data(string(pending_data.begin(), pending_data.end()));
 121         serialized.set_has_metacube_header(has_metacube_header);
 122         serialized.set_sock(sock);
 123         serialized.set_bytes_received(stats.bytes_received);
 124         serialized.set_data_bytes_received(stats.data_bytes_received);
 125         serialized.set_connect_time(stats.connect_time);
 126         return serialized;
 127 }
 128
 129 int HTTPInput::lookup_and_connect(const string &host, const string &port)
 130 {
 131         addrinfo *ai;
 132         int err = getaddrinfo(host.c_str(), port.c_str(), NULL, &ai);
 133         if (err != 0) {
 134                 log(WARNING, "[%s] Lookup of '%s' failed (%s).",
 135                         url.c_str(), host.c_str(), gai_strerror(err));
 136                 return -1;
 137         }
 138
 139         addrinfo *base_ai = ai;
 140
 141         // Connect to everything in turn until we have a socket.
 142         for ( ; ai && !should_stop(); ai = ai->ai_next) {
 143                 int sock = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
 144                 if (sock == -1) {
 145                         // Could be e.g. EPROTONOSUPPORT. The show must go on.
 146                         continue;
 147                 }
 148
 149                 // Now do a non-blocking connect. This is important because we want to be able to be
 150                 // woken up, even though it's rather cumbersome.
 151
 152                 // Set the socket as nonblocking.
 153                 int one = 1;
 154                 if (ioctl(sock, FIONBIO, &one) == -1) {
 155                         log_perror("ioctl(FIONBIO)");
 156                         safe_close(sock);
 157                         return -1;
 158                 }
 159
 160                 // Do a non-blocking connect.
 161                 do {
 162                         err = connect(sock, ai->ai_addr, ai->ai_addrlen);
 163                 } while (err == -1 && errno == EINTR);
 164
 165                 if (err == -1 && errno != EINPROGRESS) {
 166                         log_perror("connect");
 167                         safe_close(sock);
 168                         continue;
 169                 }
 170
 171                 // Wait for the connect to complete, or an error to happen.
 172                 for ( ;; ) {
 173                         bool complete = wait_for_activity(sock, POLLIN | POLLOUT, NULL);
 174                         if (should_stop()) {
 175                                 safe_close(sock);
 176                                 return -1;
 177                         }
 178                         if (complete) {
 179                                 break;
 180                         }
 181                 }
 182
 183                 // Check whether it ended in an error or not.
 184                 socklen_t err_size = sizeof(err);
 185                 if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &err_size) == -1) {
 186                         log_perror("getsockopt");
 187                         safe_close(sock);
 188                         continue;
 189                 }
 190
 191                 errno = err;
 192
 193                 if (err == 0) {
 194                         // Successful connect.
 195                         freeaddrinfo(base_ai);
 196                         return sock;
 197                 }
 198
 199                 safe_close(sock);
 200         }
 201
 202         // Give the last one as error.
 203         log(WARNING, "[%s] Connect to '%s' failed (%s)",
 204                 url.c_str(), host.c_str(), strerror(errno));
 205         freeaddrinfo(base_ai);
 206         return -1;
 207 }
 208
 209 bool HTTPInput::parse_response(const std::string &request)
 210 {
 211         vector<string> lines = split_lines(response);
 212         if (lines.empty()) {
 213                 log(WARNING, "[%s] Empty HTTP response from input.", url.c_str());
 214                 return false;
 215         }
 216
 217         vector<string> first_line_tokens = split_tokens(lines[0]);
 218         if (first_line_tokens.size() < 2) {
 219                 log(WARNING, "[%s] Malformed response line '%s' from input.",
 220                         url.c_str(), lines[0].c_str());
 221                 return false;
 222         }
 223
 224         int response = atoi(first_line_tokens[1].c_str());
 225         if (response != 200) {
 226                 log(WARNING, "[%s] Non-200 response '%s' from input.",
 227                         url.c_str(), lines[0].c_str());
 228                 return false;
 229         }
 230
 231         multimap<string, string> parameters;
 232         for (size_t i = 1; i < lines.size(); ++i) {
 233                 size_t split = lines[i].find(":");
 234                 if (split == string::npos) {
 235                         log(WARNING, "[%s] Ignoring malformed HTTP response line '%s'",
 236                                 url.c_str(), lines[i].c_str());
 237                         continue;
 238                 }
 239
 240                 string key(lines[i].begin(), lines[i].begin() + split);
 241
 242                 // Skip any spaces after the colon.
 243                 do {
 244                         ++split;
 245                 } while (split < lines[i].size() && lines[i][split] == ' ');
 246
 247                 string value(lines[i].begin() + split, lines[i].end());
 248
 249                 // Remove “Content-encoding: metacube”.
 250                 // TODO: Make case-insensitive.
 251                 if (key == "Content-encoding" && value == "metacube") {
 252                         continue;
 253                 }
 254
 255                 parameters.insert(make_pair(key, value));
 256         }
 257
 258         // Change “Server: foo” to “Server: metacube/0.1 (reflecting: foo)”
 259         // TODO: Make case-insensitive.
 260         // XXX: Use a Via: instead?
 261         if (parameters.count("Server") == 0) {
 262                 parameters.insert(make_pair("Server", SERVER_IDENTIFICATION));
 263         } else {
 264                 for (multimap<string, string>::iterator it = parameters.begin();
 265                      it != parameters.end();
 266                      ++it) {
 267                         if (it->first != "Server") {
 268                                 continue;
 269                         }
 270                         it->second = SERVER_IDENTIFICATION " (reflecting: " + it->second + ")";
 271                 }
 272         }
 273
 274         // Set “Connection: close”.
 275         // TODO: Make case-insensitive.
 276         parameters.erase("Connection");
 277         parameters.insert(make_pair("Connection", "close"));
 278
 279         // Construct the new HTTP header.
 280         http_header = "HTTP/1.0 200 OK\r\n";
 281         for (multimap<string, string>::iterator it = parameters.begin();
 282              it != parameters.end();
 283              ++it) {
 284                 http_header.append(it->first + ": " + it->second + "\r\n");
 285         }
 286
 287         for (size_t i = 0; i < stream_indices.size(); ++i) {
 288                 servers->set_header(stream_indices[i], http_header, stream_header);
 289         }
 290
 291         return true;
 292 }
 293
 294 void HTTPInput::do_work()
 295 {
 296         timespec last_activity;
 297
 298         // TODO: Make the timeout persist across restarts.
 299         if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
 300                 int err = clock_gettime(CLOCK_MONOTONIC, &last_activity);
 301                 assert(err != -1);
 302         }
 303
 304         while (!should_stop()) {
 305                 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
 306                         // Give the socket 30 seconds since last activity before we time out.
 307                         static const int timeout_secs = 30;
 308
 309                         timespec now;
 310                         int err = clock_gettime(CLOCK_MONOTONIC, &now);
 311                         assert(err != -1);
 312
 313                         timespec elapsed = clock_diff(last_activity, now);
 314                         if (elapsed.tv_sec >= timeout_secs) {
 315                                 // Timeout!
 316                                 log(ERROR, "[%s] Timeout after %d seconds, closing.", url.c_str(), elapsed.tv_sec);
 317                                 state = CLOSING_SOCKET;
 318                                 continue;
 319                         }
 320
 321                         // Basically calculate (30 - (now - last_activity)) = (30 + (last_activity - now)).
 322                         // Add a second of slack to account for differences between clocks.
 323                         timespec timeout = clock_diff(now, last_activity);
 324                         timeout.tv_sec += timeout_secs + 1;
 325                         assert(timeout.tv_sec > 0 || (timeout.tv_sec >= 0 && timeout.tv_nsec > 0));
 326
 327                         bool activity = wait_for_activity(sock, (state == SENDING_REQUEST) ? POLLOUT : POLLIN, &timeout);
 328                         if (activity) {
 329                                 err = clock_gettime(CLOCK_MONOTONIC, &last_activity);
 330                                 assert(err != -1);
 331                         } else {
 332                                 // OK. Most likely, should_stop was set, or we have timed out.
 333                                 continue;
 334                         }
 335                 }
 336
 337                 switch (state) {
 338                 case NOT_CONNECTED:
 339                         request.clear();
 340                         request_bytes_sent = 0;
 341                         response.clear();
 342                         pending_data.clear();
 343                         has_metacube_header = false;
 344                         for (size_t i = 0; i < stream_indices.size(); ++i) {
 345                                 servers->set_header(stream_indices[i], "", "");
 346                         }
 347
 348                         {
 349                                 string protocol;  // Thrown away.
 350                                 if (!parse_url(url, &protocol, &host, &port, &path)) {
 351                                         log(WARNING, "[%s] Failed to parse URL '%s'", url.c_str(), url.c_str());
 352                                         break;
 353                                 }
 354                         }
 355
 356                         sock = lookup_and_connect(host, port);
 357                         if (sock != -1) {
 358                                 // Yay, successful connect. Try to set it as nonblocking.
 359                                 int one = 1;
 360                                 if (ioctl(sock, FIONBIO, &one) == -1) {
 361                                         log_perror("ioctl(FIONBIO)");
 362                                         state = CLOSING_SOCKET;
 363                                 } else {
 364                                         state = SENDING_REQUEST;
 365                                         request = "GET " + path + " HTTP/1.0\r\nUser-Agent: cubemap\r\n\r\n";
 366                                         request_bytes_sent = 0;
 367                                 }
 368
 369                                 MutexLock lock(&stats_mutex);
 370                                 stats.connect_time = time(NULL);
 371                                 clock_gettime(CLOCK_MONOTONIC, &last_activity);
 372                         }
 373                         break;
 374                 case SENDING_REQUEST: {
 375                         size_t to_send = request.size() - request_bytes_sent;
 376                         int ret;
 377
 378                         do {
 379                                 ret = write(sock, request.data() + request_bytes_sent, to_send);
 380                         } while (ret == -1 && errno == EINTR);
 381
 382                         if (ret == -1) {
 383                                 log_perror("write");
 384                                 state = CLOSING_SOCKET;
 385                                 continue;
 386                         }
 387
 388                         assert(ret >= 0);
 389                         request_bytes_sent += ret;
 390
 391                         if (request_bytes_sent == request.size()) {
 392                                 state = RECEIVING_HEADER;
 393                         }
 394                         break;
 395                 }
 396                 case RECEIVING_HEADER: {
 397                         char buf[4096];
 398                         int ret;
 399
 400                         do {
 401                                 ret = read(sock, buf, sizeof(buf));
 402                         } while (ret == -1 && errno == EINTR);
 403
 404                         if (ret == -1) {
 405                                 log_perror("read");
 406                                 state = CLOSING_SOCKET;
 407                                 continue;
 408                         }
 409
 410                         if (ret == 0) {
 411                                 // This really shouldn't happen...
 412                                 log(ERROR, "[%s] Socket unexpectedly closed while reading header",
 413                                            url.c_str());
 414                                 state = CLOSING_SOCKET;
 415                                 continue;
 416                         }
 417
 418                         RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
 419
 420                         if (status == RP_OUT_OF_SPACE) {
 421                                 log(WARNING, "[%s] Sever sent overlong HTTP response!", url.c_str());
 422                                 state = CLOSING_SOCKET;
 423                                 continue;
 424                         } else if (status == RP_NOT_FINISHED_YET) {
 425                                 continue;
 426                         }
 427
 428                         // OK, so we're fine, but there might be some of the actual data after the response.
 429                         // We'll need to deal with that separately.
 430                         string extra_data;
 431                         if (status == RP_EXTRA_DATA) {
 432                                 char *ptr = static_cast<char *>(
 433                                         memmem(response.data(), response.size(), "\r\n\r\n", 4));
 434                                 assert(ptr != NULL);
 435                                 extra_data = string(ptr + 4, &response[0] + response.size());
 436                                 response.resize(ptr - response.data());
 437                         }
 438
 439                         if (!parse_response(response)) {
 440                                 state = CLOSING_SOCKET;
 441                                 continue;
 442                         }
 443
 444                         if (!extra_data.empty()) {
 445                                 process_data(&extra_data[0], extra_data.size());
 446                         }
 447
 448                         log(INFO, "[%s] Connected to '%s', receiving data.",
 449                                    url.c_str(), url.c_str());
 450                         state = RECEIVING_DATA;
 451                         break;
 452                 }
 453                 case RECEIVING_DATA: {
 454                         char buf[4096];
 455                         int ret;
 456
 457                         do {
 458                                 ret = read(sock, buf, sizeof(buf));
 459                         } while (ret == -1 && errno == EINTR);
 460
 461                         if (ret == -1) {
 462                                 log_perror("read");
 463                                 state = CLOSING_SOCKET;
 464                                 continue;
 465                         }
 466
 467                         if (ret == 0) {
 468                                 // This really shouldn't happen...
 469                                 log(ERROR, "[%s] Socket unexpectedly closed while reading data",
 470                                            url.c_str());
 471                                 state = CLOSING_SOCKET;
 472                                 continue;
 473                         }
 474
 475                         process_data(buf, ret);
 476                         break;
 477                 }
 478                 case CLOSING_SOCKET: {
 479                         close_socket();
 480                         state = NOT_CONNECTED;
 481                         break;
 482                 }
 483                 default:
 484                         assert(false);
 485                 }
 486
 487                 // If we are still in NOT_CONNECTED, either something went wrong,
 488                 // or the connection just got closed.
 489                 // The earlier steps have already given the error message, if any.
 490                 if (state == NOT_CONNECTED && !should_stop()) {
 491                         log(INFO, "[%s] Waiting 0.2 second and restarting...", url.c_str());
 492                         timespec timeout_ts;
 493                         timeout_ts.tv_sec = 0;
 494                         timeout_ts.tv_nsec = 200000000;
 495                         wait_for_wakeup(&timeout_ts);
 496                 }
 497         }
 498 }
 499
 500 void HTTPInput::process_data(char *ptr, size_t bytes)
 501 {
 502         pending_data.insert(pending_data.end(), ptr, ptr + bytes);
 503         {
 504                 MutexLock mutex(&stats_mutex);
 505                 stats.bytes_received += bytes;
 506         }
 507
 508         for ( ;; ) {
 509                 // If we don't have enough data (yet) for even the Metacube header, just return.
 510                 if (pending_data.size() < sizeof(metacube2_block_header)) {
 511                         return;
 512                 }
 513
 514                 // Make sure we have the Metacube sync header at the start.
 515                 // We may need to skip over junk data (it _should_ not happen, though).
 516                 if (!has_metacube_header) {
 517                         char *ptr = static_cast<char *>(
 518                                 memmem(pending_data.data(), pending_data.size(),
 519                                        METACUBE2_SYNC, strlen(METACUBE2_SYNC)));
 520                         if (ptr == NULL) {
 521                                 // OK, so we didn't find the sync marker. We know then that
 522                                 // we do not have the _full_ marker in the buffer, but we
 523                                 // could have N-1 bytes. Drop everything before that,
 524                                 // and then give up.
 525                                 drop_pending_data(pending_data.size() - (strlen(METACUBE2_SYNC) - 1));
 526                                 return;
 527                         } else {
 528                                 // Yay, we found the header. Drop everything (if anything) before it.
 529                                 drop_pending_data(ptr - pending_data.data());
 530                                 has_metacube_header = true;
 531
 532                                 // Re-check that we have the entire header; we could have dropped data.
 533                                 if (pending_data.size() < sizeof(metacube2_block_header)) {
 534                                         return;
 535                                 }
 536                         }
 537                 }
 538
 539                 // Now it's safe to read the header.
 540                 metacube2_block_header hdr;
 541                 memcpy(&hdr, pending_data.data(), sizeof(hdr));
 542                 assert(memcmp(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync)) == 0);
 543                 uint32_t size = ntohl(hdr.size);
 544                 uint16_t flags = ntohs(hdr.flags);
 545                 uint16_t expected_csum = metacube2_compute_crc(&hdr);
 546
 547                 if (expected_csum != ntohs(hdr.csum)) {
 548                         log(WARNING, "[%s] Metacube checksum failed (expected 0x%x, got 0x%x), "
 549                                 "not reading block claiming to be %d bytes (flags=%x).",
 550                                 url.c_str(), expected_csum, ntohs(hdr.csum),
 551                                 size, flags);
 552
 553                         // Drop only the first byte, and let the rest of the code handle resync.
 554                         pending_data.erase(pending_data.begin(), pending_data.begin() + 1);
 555                         has_metacube_header = false;
 556                         continue;
 557                 }
 558                 if (size > 262144) {
 559                         log(WARNING, "[%s] Metacube block of %d bytes (flags=%x); corrupted header?",
 560                                 url.c_str(), size, flags);
 561                 }
 562
 563                 // See if we have the entire block. If not, wait for more data.
 564                 if (pending_data.size() < sizeof(metacube2_block_header) + size) {
 565                         return;
 566                 }
 567
 568                 // Send this block on to the servers.
 569                 {
 570                         MutexLock lock(&stats_mutex);
 571                         stats.data_bytes_received += size;
 572                 }
 573                 char *inner_data = pending_data.data() + sizeof(metacube2_block_header);
 574                 if (flags & METACUBE_FLAGS_HEADER) {
 575                         stream_header = string(inner_data, inner_data + size);
 576                         for (size_t i = 0; i < stream_indices.size(); ++i) {
 577                                 servers->set_header(stream_indices[i], http_header, stream_header);
 578                         }
 579                 } else {
 580                         StreamStartSuitability suitable_for_stream_start;
 581                         if (flags & METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START) {
 582                                 suitable_for_stream_start = NOT_SUITABLE_FOR_STREAM_START;
 583                         } else {
 584                                 suitable_for_stream_start = SUITABLE_FOR_STREAM_START;
 585                         }
 586                         for (size_t i = 0; i < stream_indices.size(); ++i) {
 587                                 servers->add_data(stream_indices[i], inner_data, size, suitable_for_stream_start);
 588                         }
 589                 }
 590
 591                 // Consume the block. This isn't the most efficient way of dealing with things
 592                 // should we have many blocks, but these routines don't need to be too efficient
 593                 // anyway.
 594                 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube2_block_header) + size);
 595                 has_metacube_header = false;
 596         }
 597 }
 598
 599 void HTTPInput::drop_pending_data(size_t num_bytes)
 600 {
 601         if (num_bytes == 0) {
 602                 return;
 603         }
 604         log(WARNING, "[%s] Dropping %lld junk bytes from stream, maybe it is not a Metacube2 stream?",
 605                 url.c_str(), (long long)num_bytes);
 606         assert(pending_data.size() >= num_bytes);
 607         pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);
 608 }
 609
 610 void HTTPInput::add_destination(int stream_index)
 611 {
 612         stream_indices.push_back(stream_index);
 613         servers->set_header(stream_index, http_header, stream_header);
 614 }
 615
 616 InputStats HTTPInput::get_stats() const
 617 {
 618         MutexLock lock(&stats_mutex);
 619         return stats;
 620 }