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 "timespec.h"
  28 #include "util.h"
  29 #include "version.h"
  30
  31 using namespace std;
  32
  33 extern ServerPool *servers;
  34
  35 HTTPInput::HTTPInput(const string &url, Input::Encoding encoding)
  36         : state(NOT_CONNECTED),
  37           url(url),
  38           encoding(encoding),
  39           has_metacube_header(false),
  40           sock(-1)
  41 {
  42         pthread_mutex_init(&stats_mutex, NULL);
  43         stats.url = url;
  44         stats.bytes_received = 0;
  45         stats.data_bytes_received = 0;
  46         stats.connect_time = -1;
  47 }
  48
  49 HTTPInput::HTTPInput(const InputProto &serialized)
  50         : state(State(serialized.state())),
  51           url(serialized.url()),
  52           encoding(serialized.is_metacube_encoded() ?
  53                    Input::INPUT_ENCODING_METACUBE :
  54                    Input::INPUT_ENCODING_RAW),
  55           request(serialized.request()),
  56           request_bytes_sent(serialized.request_bytes_sent()),
  57           response(serialized.response()),
  58           http_header(serialized.http_header()),
  59           stream_header(serialized.stream_header()),
  60           has_metacube_header(serialized.has_metacube_header()),
  61           sock(serialized.sock())
  62 {
  63         pending_data.resize(serialized.pending_data().size());
  64         memcpy(&pending_data[0], serialized.pending_data().data(), serialized.pending_data().size());
  65
  66         string protocol, user;
  67         parse_url(url, &protocol, &user, &host, &port, &path);  // Don't care if it fails.
  68
  69         pthread_mutex_init(&stats_mutex, NULL);
  70         stats.url = url;
  71         stats.bytes_received = serialized.bytes_received();
  72         stats.data_bytes_received = serialized.data_bytes_received();
  73         if (serialized.has_connect_time()) {
  74                 stats.connect_time = serialized.connect_time();
  75         } else {
  76                 stats.connect_time = time(NULL);
  77         }
  78 }
  79
  80 void HTTPInput::close_socket()
  81 {
  82         if (sock != -1) {
  83                 safe_close(sock);
  84                 sock = -1;
  85         }
  86
  87         MutexLock lock(&stats_mutex);
  88         stats.connect_time = -1;
  89 }
  90
  91 InputProto HTTPInput::serialize() const
  92 {
  93         InputProto serialized;
  94         serialized.set_state(state);
  95         serialized.set_url(url);
  96         serialized.set_request(request);
  97         serialized.set_request_bytes_sent(request_bytes_sent);
  98         serialized.set_response(response);
  99         serialized.set_http_header(http_header);
 100         serialized.set_stream_header(stream_header);
 101         serialized.set_pending_data(string(pending_data.begin(), pending_data.end()));
 102         serialized.set_has_metacube_header(has_metacube_header);
 103         serialized.set_sock(sock);
 104         serialized.set_bytes_received(stats.bytes_received);
 105         serialized.set_data_bytes_received(stats.data_bytes_received);
 106         serialized.set_connect_time(stats.connect_time);
 107         if (encoding == Input::INPUT_ENCODING_METACUBE) {
 108                 serialized.set_is_metacube_encoded(true);
 109         } else {
 110                 assert(encoding == Input::INPUT_ENCODING_RAW);
 111                 serialized.set_is_metacube_encoded(false);
 112         }
 113         return serialized;
 114 }
 115
 116 int HTTPInput::lookup_and_connect(const string &host, const string &port)
 117 {
 118         addrinfo *ai;
 119         int err = getaddrinfo(host.c_str(), port.c_str(), NULL, &ai);
 120         if (err != 0) {
 121                 log(WARNING, "[%s] Lookup of '%s' failed (%s).",
 122                         url.c_str(), host.c_str(), gai_strerror(err));
 123                 return -1;
 124         }
 125
 126         addrinfo *base_ai = ai;
 127
 128         // Connect to everything in turn until we have a socket.
 129         for ( ; ai && !should_stop(); ai = ai->ai_next) {
 130                 int sock = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
 131                 if (sock == -1) {
 132                         // Could be e.g. EPROTONOSUPPORT. The show must go on.
 133                         continue;
 134                 }
 135
 136                 // Now do a non-blocking connect. This is important because we want to be able to be
 137                 // woken up, even though it's rather cumbersome.
 138
 139                 // Set the socket as nonblocking.
 140                 int one = 1;
 141                 if (ioctl(sock, FIONBIO, &one) == -1) {
 142                         log_perror("ioctl(FIONBIO)");
 143                         safe_close(sock);
 144                         return -1;
 145                 }
 146
 147                 // Do a non-blocking connect.
 148                 do {
 149                         err = connect(sock, ai->ai_addr, ai->ai_addrlen);
 150                 } while (err == -1 && errno == EINTR);
 151
 152                 if (err == -1 && errno != EINPROGRESS) {
 153                         log_perror("connect");
 154                         safe_close(sock);
 155                         continue;
 156                 }
 157
 158                 // Wait for the connect to complete, or an error to happen.
 159                 for ( ;; ) {
 160                         bool complete = wait_for_activity(sock, POLLIN | POLLOUT, NULL);
 161                         if (should_stop()) {
 162                                 safe_close(sock);
 163                                 return -1;
 164                         }
 165                         if (complete) {
 166                                 break;
 167                         }
 168                 }
 169
 170                 // Check whether it ended in an error or not.
 171                 socklen_t err_size = sizeof(err);
 172                 if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &err_size) == -1) {
 173                         log_perror("getsockopt");
 174                         safe_close(sock);
 175                         continue;
 176                 }
 177
 178                 errno = err;
 179
 180                 if (err == 0) {
 181                         // Successful connect.
 182                         freeaddrinfo(base_ai);
 183                         return sock;
 184                 }
 185
 186                 safe_close(sock);
 187         }
 188
 189         // Give the last one as error.
 190         log(WARNING, "[%s] Connect to '%s' failed (%s)",
 191                 url.c_str(), host.c_str(), strerror(errno));
 192         freeaddrinfo(base_ai);
 193         return -1;
 194 }
 195
 196 bool HTTPInput::parse_response(const string &request)
 197 {
 198         vector<string> lines = split_lines(response);
 199         if (lines.empty()) {
 200                 log(WARNING, "[%s] Empty HTTP response from input.", url.c_str());
 201                 return false;
 202         }
 203
 204         vector<string> first_line_tokens = split_tokens(lines[0]);
 205         if (first_line_tokens.size() < 2) {
 206                 log(WARNING, "[%s] Malformed response line '%s' from input.",
 207                         url.c_str(), lines[0].c_str());
 208                 return false;
 209         }
 210
 211         int response = atoi(first_line_tokens[1].c_str());
 212         if (response != 200) {
 213                 log(WARNING, "[%s] Non-200 response '%s' from input.",
 214                         url.c_str(), lines[0].c_str());
 215                 return false;
 216         }
 217
 218         multimap<string, string> parameters = extract_headers(lines, url);
 219
 220         // Remove “Content-encoding: metacube”.
 221         // TODO: Make case-insensitive.
 222         multimap<string, string>::iterator encoding_it =
 223                 parameters.find("Content-encoding");
 224         if (encoding_it != parameters.end() && encoding_it->second == "metacube") {
 225                 parameters.erase(encoding_it);
 226         }
 227
 228         // Change “Server: foo” to “Server: metacube/0.1 (reflecting: foo)”
 229         // TODO: Make case-insensitive.
 230         // XXX: Use a Via: instead?
 231         if (parameters.count("Server") == 0) {
 232                 parameters.insert(make_pair("Server", SERVER_IDENTIFICATION));
 233         } else {
 234                 for (multimap<string, string>::iterator it = parameters.begin();
 235                      it != parameters.end();
 236                      ++it) {
 237                         if (it->first != "Server") {
 238                                 continue;
 239                         }
 240                         it->second = SERVER_IDENTIFICATION " (reflecting: " + it->second + ")";
 241                 }
 242         }
 243
 244         // Set “Connection: close”.
 245         // TODO: Make case-insensitive.
 246         parameters.erase("Connection");
 247         parameters.insert(make_pair("Connection", "close"));
 248
 249         // Construct the new HTTP header.
 250         http_header = "HTTP/1.0 200 OK\r\n";
 251         for (multimap<string, string>::iterator it = parameters.begin();
 252              it != parameters.end();
 253              ++it) {
 254                 http_header.append(it->first + ": " + it->second + "\r\n");
 255         }
 256
 257         for (size_t i = 0; i < stream_indices.size(); ++i) {
 258                 servers->set_header(stream_indices[i], http_header, stream_header);
 259         }
 260
 261         return true;
 262 }
 263
 264 void HTTPInput::do_work()
 265 {
 266         timespec last_activity;
 267
 268         // TODO: Make the timeout persist across restarts.
 269         if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
 270                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
 271                 assert(err != -1);
 272         }
 273
 274         while (!should_stop()) {
 275                 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
 276                         // Give the socket 30 seconds since last activity before we time out.
 277                         static const int timeout_secs = 30;
 278
 279                         timespec now;
 280                         int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &now);
 281                         assert(err != -1);
 282
 283                         timespec elapsed = clock_diff(last_activity, now);
 284                         if (elapsed.tv_sec >= timeout_secs) {
 285                                 // Timeout!
 286                                 log(ERROR, "[%s] Timeout after %d seconds, closing.", url.c_str(), elapsed.tv_sec);
 287                                 state = CLOSING_SOCKET;
 288                                 continue;
 289                         }
 290
 291                         // Basically calculate (30 - (now - last_activity)) = (30 + (last_activity - now)).
 292                         // Add a second of slack to account for differences between clocks.
 293                         timespec timeout = clock_diff(now, last_activity);
 294                         timeout.tv_sec += timeout_secs + 1;
 295                         assert(timeout.tv_sec > 0 || (timeout.tv_sec >= 0 && timeout.tv_nsec > 0));
 296
 297                         bool activity = wait_for_activity(sock, (state == SENDING_REQUEST) ? POLLOUT : POLLIN, &timeout);
 298                         if (activity) {
 299                                 err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
 300                                 assert(err != -1);
 301                         } else {
 302                                 // OK. Most likely, should_stop was set, or we have timed out.
 303                                 continue;
 304                         }
 305                 }
 306
 307                 switch (state) {
 308                 case NOT_CONNECTED:
 309                         request.clear();
 310                         request_bytes_sent = 0;
 311                         response.clear();
 312                         pending_data.clear();
 313                         has_metacube_header = false;
 314                         for (size_t i = 0; i < stream_indices.size(); ++i) {
 315                                 servers->set_header(stream_indices[i], "", "");
 316                         }
 317
 318                         {
 319                                 string protocol, user;  // Thrown away.
 320                                 if (!parse_url(url, &protocol, &user, &host, &port, &path)) {
 321                                         log(WARNING, "[%s] Failed to parse URL '%s'", url.c_str(), url.c_str());
 322                                         break;
 323                                 }
 324
 325                                 // Remove the brackets around IPv6 address literals.
 326                                 // TODO: See if we can join this with the code in parse_ip_address(),
 327                                 // or maybe even more it into parse_url().
 328                                 if (!host.empty() && host[0] == '[' && host[host.size() - 1] == ']') {
 329                                         host = host.substr(1, host.size() - 2);
 330                                 }
 331                         }
 332
 333                         sock = lookup_and_connect(host, port);
 334                         if (sock != -1) {
 335                                 // Yay, successful connect. Try to set it as nonblocking.
 336                                 int one = 1;
 337                                 if (ioctl(sock, FIONBIO, &one) == -1) {
 338                                         log_perror("ioctl(FIONBIO)");
 339                                         state = CLOSING_SOCKET;
 340                                 } else {
 341                                         state = SENDING_REQUEST;
 342                                         request = "GET " + path + " HTTP/1.0\r\nUser-Agent: cubemap\r\n\r\n";
 343                                         request_bytes_sent = 0;
 344                                 }
 345
 346                                 MutexLock lock(&stats_mutex);
 347                                 stats.connect_time = time(NULL);
 348                                 clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
 349                         }
 350                         break;
 351                 case SENDING_REQUEST: {
 352                         size_t to_send = request.size() - request_bytes_sent;
 353                         int ret;
 354
 355                         do {
 356                                 ret = write(sock, request.data() + request_bytes_sent, to_send);
 357                         } while (ret == -1 && errno == EINTR);
 358
 359                         if (ret == -1) {
 360                                 log_perror("write");
 361                                 state = CLOSING_SOCKET;
 362                                 continue;
 363                         }
 364
 365                         assert(ret >= 0);
 366                         request_bytes_sent += ret;
 367
 368                         if (request_bytes_sent == request.size()) {
 369                                 state = RECEIVING_HEADER;
 370                         }
 371                         break;
 372                 }
 373                 case RECEIVING_HEADER: {
 374                         char buf[4096];
 375                         int ret;
 376
 377                         do {
 378                                 ret = read(sock, buf, sizeof(buf));
 379                         } while (ret == -1 && errno == EINTR);
 380
 381                         if (ret == -1) {
 382                                 log_perror("read");
 383                                 state = CLOSING_SOCKET;
 384                                 continue;
 385                         }
 386
 387                         if (ret == 0) {
 388                                 // This really shouldn't happen...
 389                                 log(ERROR, "[%s] Socket unexpectedly closed while reading header",
 390                                            url.c_str());
 391                                 state = CLOSING_SOCKET;
 392                                 continue;
 393                         }
 394
 395                         RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
 396
 397                         if (status == RP_OUT_OF_SPACE) {
 398                                 log(WARNING, "[%s] Server sent overlong HTTP response!", url.c_str());
 399                                 state = CLOSING_SOCKET;
 400                                 continue;
 401                         } else if (status == RP_NOT_FINISHED_YET) {
 402                                 continue;
 403                         }
 404
 405                         // OK, so we're fine, but there might be some of the actual data after the response.
 406                         // We'll need to deal with that separately.
 407                         string extra_data;
 408                         if (status == RP_EXTRA_DATA) {
 409                                 char *ptr = static_cast<char *>(
 410                                         memmem(response.data(), response.size(), "\r\n\r\n", 4));
 411                                 assert(ptr != NULL);
 412                                 extra_data = string(ptr + 4, &response[0] + response.size());
 413                                 response.resize(ptr - response.data());
 414                         }
 415
 416                         if (!parse_response(response)) {
 417                                 state = CLOSING_SOCKET;
 418                                 continue;
 419                         }
 420
 421                         if (!extra_data.empty()) {
 422                                 process_data(&extra_data[0], extra_data.size());
 423                         }
 424
 425                         if (encoding == Input::INPUT_ENCODING_RAW) {
 426                                 log(INFO, "[%s] Connected to '%s', receiving raw data.",
 427                                            url.c_str(), url.c_str());
 428                         } else {
 429                                 assert(encoding == Input::INPUT_ENCODING_METACUBE);
 430                                 log(INFO, "[%s] Connected to '%s', receiving data.",
 431                                            url.c_str(), url.c_str());
 432                         }
 433                         state = RECEIVING_DATA;
 434                         break;
 435                 }
 436                 case RECEIVING_DATA: {
 437                         char buf[4096];
 438                         int ret;
 439
 440                         do {
 441                                 ret = read(sock, buf, sizeof(buf));
 442                         } while (ret == -1 && errno == EINTR);
 443
 444                         if (ret == -1) {
 445                                 log_perror("read");
 446                                 state = CLOSING_SOCKET;
 447                                 continue;
 448                         }
 449
 450                         if (ret == 0) {
 451                                 // This really shouldn't happen...
 452                                 log(ERROR, "[%s] Socket unexpectedly closed while reading data",
 453                                            url.c_str());
 454                                 state = CLOSING_SOCKET;
 455                                 continue;
 456                         }
 457
 458                         process_data(buf, ret);
 459                         break;
 460                 }
 461                 case CLOSING_SOCKET: {
 462                         close_socket();
 463                         state = NOT_CONNECTED;
 464                         break;
 465                 }
 466                 default:
 467                         assert(false);
 468                 }
 469
 470                 // If we are still in NOT_CONNECTED, either something went wrong,
 471                 // or the connection just got closed.
 472                 // The earlier steps have already given the error message, if any.
 473                 if (state == NOT_CONNECTED && !should_stop()) {
 474                         log(INFO, "[%s] Waiting 0.2 second and restarting...", url.c_str());
 475                         timespec timeout_ts;
 476                         timeout_ts.tv_sec = 0;
 477                         timeout_ts.tv_nsec = 200000000;
 478                         wait_for_wakeup(&timeout_ts);
 479                 }
 480         }
 481 }
 482
 483 void HTTPInput::process_data(char *ptr, size_t bytes)
 484 {
 485         pending_data.insert(pending_data.end(), ptr, ptr + bytes);
 486         {
 487                 MutexLock mutex(&stats_mutex);
 488                 stats.bytes_received += bytes;
 489         }
 490
 491         if (encoding == Input::INPUT_ENCODING_RAW) {
 492                 for (size_t i = 0; i < stream_indices.size(); ++i) {
 493                         servers->add_data(stream_indices[i], ptr, bytes, SUITABLE_FOR_STREAM_START);
 494                 }
 495                 return;
 496         }
 497
 498         assert(encoding == Input::INPUT_ENCODING_METACUBE);
 499
 500         for ( ;; ) {
 501                 // If we don't have enough data (yet) for even the Metacube header, just return.
 502                 if (pending_data.size() < sizeof(metacube2_block_header)) {
 503                         return;
 504                 }
 505
 506                 // Make sure we have the Metacube sync header at the start.
 507                 // We may need to skip over junk data (it _should_ not happen, though).
 508                 if (!has_metacube_header) {
 509                         char *ptr = static_cast<char *>(
 510                                 memmem(pending_data.data(), pending_data.size(),
 511                                        METACUBE2_SYNC, strlen(METACUBE2_SYNC)));
 512                         if (ptr == NULL) {
 513                                 // OK, so we didn't find the sync marker. We know then that
 514                                 // we do not have the _full_ marker in the buffer, but we
 515                                 // could have N-1 bytes. Drop everything before that,
 516                                 // and then give up.
 517                                 drop_pending_data(pending_data.size() - (strlen(METACUBE2_SYNC) - 1));
 518                                 return;
 519                         } else {
 520                                 // Yay, we found the header. Drop everything (if anything) before it.
 521                                 drop_pending_data(ptr - pending_data.data());
 522                                 has_metacube_header = true;
 523
 524                                 // Re-check that we have the entire header; we could have dropped data.
 525                                 if (pending_data.size() < sizeof(metacube2_block_header)) {
 526                                         return;
 527                                 }
 528                         }
 529                 }
 530
 531                 // Now it's safe to read the header.
 532                 metacube2_block_header hdr;
 533                 memcpy(&hdr, pending_data.data(), sizeof(hdr));
 534                 assert(memcmp(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync)) == 0);
 535                 uint32_t size = ntohl(hdr.size);
 536                 uint16_t flags = ntohs(hdr.flags);
 537                 uint16_t expected_csum = metacube2_compute_crc(&hdr);
 538
 539                 if (expected_csum != ntohs(hdr.csum)) {
 540                         log(WARNING, "[%s] Metacube checksum failed (expected 0x%x, got 0x%x), "
 541                                 "not reading block claiming to be %d bytes (flags=%x).",
 542                                 url.c_str(), expected_csum, ntohs(hdr.csum),
 543                                 size, flags);
 544
 545                         // Drop only the first byte, and let the rest of the code handle resync.
 546                         pending_data.erase(pending_data.begin(), pending_data.begin() + 1);
 547                         has_metacube_header = false;
 548                         continue;
 549                 }
 550                 if (size > 10485760) {
 551                         log(WARNING, "[%s] Metacube block of %d bytes (flags=%x); corrupted header??",
 552                                 url.c_str(), size, flags);
 553                 }
 554
 555                 // See if we have the entire block. If not, wait for more data.
 556                 if (pending_data.size() < sizeof(metacube2_block_header) + size) {
 557                         return;
 558                 }
 559
 560                 // Send this block on to the servers.
 561                 {
 562                         MutexLock lock(&stats_mutex);
 563                         stats.data_bytes_received += size;
 564                 }
 565                 char *inner_data = pending_data.data() + sizeof(metacube2_block_header);
 566                 if (flags & METACUBE_FLAGS_HEADER) {
 567                         stream_header = string(inner_data, inner_data + size);
 568                         for (size_t i = 0; i < stream_indices.size(); ++i) {
 569                                 servers->set_header(stream_indices[i], http_header, stream_header);
 570                         }
 571                 } else {
 572                         StreamStartSuitability suitable_for_stream_start;
 573                         if (flags & METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START) {
 574                                 suitable_for_stream_start = NOT_SUITABLE_FOR_STREAM_START;
 575                         } else {
 576                                 suitable_for_stream_start = SUITABLE_FOR_STREAM_START;
 577                         }
 578                         for (size_t i = 0; i < stream_indices.size(); ++i) {
 579                                 servers->add_data(stream_indices[i], inner_data, size, suitable_for_stream_start);
 580                         }
 581                 }
 582
 583                 // Consume the block. This isn't the most efficient way of dealing with things
 584                 // should we have many blocks, but these routines don't need to be too efficient
 585                 // anyway.
 586                 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube2_block_header) + size);
 587                 has_metacube_header = false;
 588         }
 589 }
 590
 591 void HTTPInput::drop_pending_data(size_t num_bytes)
 592 {
 593         if (num_bytes == 0) {
 594                 return;
 595         }
 596         log(WARNING, "[%s] Dropping %lld junk bytes; not a Metacube2 stream, or data was dropped from the middle of the stream.",
 597                 url.c_str(), (long long)num_bytes);
 598         assert(pending_data.size() >= num_bytes);
 599         pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);
 600 }
 601
 602 void HTTPInput::add_destination(int stream_index)
 603 {
 604         stream_indices.push_back(stream_index);
 605         servers->set_header(stream_index, http_header, stream_header);
 606 }
 607
 608 InputStats HTTPInput::get_stats() const
 609 {
 610         MutexLock lock(&stats_mutex);
 611         return stats;
 612 }